(19)
(11)EP 2 546 419 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
22.01.2020 Bulletin 2020/04

(21)Application number: 11753013.9

(22)Date of filing:  03.03.2011
(51)Int. Cl.: 
E02F 9/00  (2006.01)
(86)International application number:
PCT/JP2011/001272
(87)International publication number:
WO 2011/111347 (15.09.2011 Gazette  2011/37)

(54)

HYDRAULIC TUBING SUPPORT STRUCTURE AND OPERATING MACHINE PROVIDED THEREWITH

STÜTZSTRUKTUR FÜR HYDRAULISCHE ROHRE UND DAMIT AUSGESTATTETE BETRIEBSMASCHINE

STRUCTURE DE SUPPORT DE TUBULURE HYDRAULIQUE ET MACHINE D'ACTIONNEMENT LA COMPORTANT


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 09.03.2010 JP 2010052159

(43)Date of publication of application:
16.01.2013 Bulletin 2013/03

(73)Proprietors:
  • Kabushiki Kaisha Kobe Seiko Sho
    Chuo-ku Kobe-shi Hyogo 651-8585 (JP)
  • Kobelco Construction Machinery Co., Ltd.
    Hiroshima 731-5161 (JP)

(72)Inventors:
  • MASUDA, Kyoko
    Hyogo 651-2271 (JP)
  • KAWABATA, Masashi
    Hyogo 651-2271 (JP)
  • MORI, Yoshimune
    Hyogo 651-2271 (JP)
  • KIMURA, Yasumasa
    Hyogo 651-2271 (JP)
  • UEDA, Kazuhiro
    Hiroshima 731-5161 (JP)
  • ONO, Shuichi
    Hiroshima 731-5161 (JP)

(74)Representative: TBK 
Bavariaring 4-6
80336 München
80336 München (DE)


(56)References cited: : 
JP-A- H0 932 037
JP-A- 2004 176 352
JP-A- 2007 262 690
JP-U- H0 742 810
JP-A- 2004 116 033
JP-A- 2007 262 690
JP-A- 2008 007 964
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    TECHNICAL FIELD



    [0001] The present invention relates to an operating machine including a plurality of hydraulic actuators.

    BACKGROUND ART



    [0002] Conventionally, a hydraulic shovel disclosed, for example, in patent literature 1 has been known as the above operating machine. The hydraulic shovel disclosed in patent literature 1 includes a driver's seat provided on a floor plate, a pair of operating levers provided at both left and right sides of the driver's seat, a pair of left and right remote control valves for producing pilot pressures for a plurality of hydraulic actuators in response to input operations performed on these operating levers, pump-side tubes and tank-side tubes extending from these remote control valves, and a junction tube for allowing communication of the pump-side tubes extending from the respective remote control valves and communication of the tank-side tubes extending from the respective remote control valves.

    [0003] In the hydraulic shovel of patent literature 1, the junction tube connected to each remote control valve is connected to a hydraulic pump and a tank. Further, the junction tube is fixed to the lower surface of the floor plate.

    [0004] However, since the junction tube is fixed to the lower surface of the floor plate in the hydraulic shovel of patent literature 1, there has been a problem that pulsation of hydraulic oil flowing in the junction tube is transmitted as vibration to the floor plate and becomes noise to an operator sitting on the driver's seat provided on the floor plate.

    [0005] Patent literature 2 relates to a construction machine in which a pattern selector valve is arranged in a position not to be a hindrance to work, even if an upper rotating body is formed in a small size, and which facilitates the checking of the selection position of the pattern selector valve and pattern selection operation, the following is provided. Namely, between a backside engine cover and a front-side lever stand, the pattern selector valve for selecting operation patterns for right and left operation control levers and individual control valves are provided in an intermediate position between an operator's right and left legs during the operations. This enables even an ultra-compact hydraulic excavator to be provided with the pattern selector valve. Additionally, a selector lever of the pattern selector valve is extended to the backside, and its leading end is protruded to the back end of a floor plate. Thus, the turning operation and positional checking of the selector lever can be performed only by manually opening the engine cover.

    CITATION LIST


    PATENT LITERATURE



    [0006] 

    Patent literature 1: JP 2007-262690 A

    Patent literature 2: JP 2008-007964 A


    SUMMARY OF INVENTION



    [0007] An object of the present invention is to provide a tubing support structure capable of reducing noise transmitted to an operator due to pulsation of hydraulic oil in a junction tube and an operating machine provided therewith.

    [0008] To solve the above problem, a hydraulic tubing support structure in an operating machine including a plurality of hydraulic actuators, to be provided by the present invention, includes a floor plate formed with a pair of left and right vertically penetrating through holes; a driver's seat provided on the floor plate; a pair of operating levers provided at both left and right sides of the driver's seat; a pair of left and right operation valves for generating pilot pressures for the plurality of hydraulic actuators in response to an input operation performed on each operating lever; a pair of left and right pump-side tubes respectively extending from the respective operation valves and guided to below the floor plate through the through holes; a pair of left and right tank-side tubes respectively extending from the respective operation valves and guided to below the floor plate through the through holes; a junction tube for allowing communication of the respective pump-side tubes guided to below the floor plate through the through holes and communication of the respective tank-side tubes guided to below the floor plate through the through holes; and a first reinforcement beam extending in a right-and-left direction and fixed to the lower surface of the floor plate, wherein the junction tube is fixed to the first reinforcement beam in a non-contact state with the floor plate.

    [0009] An operating machine to be provided by the present invention comprises the hydraulic tubing support structure; a hydraulic pump and a tank to be connected to the junction tube.

    [0010] According to the present invention, it is possible to reduce noise transmitted to an operator due to pulsation of hydraulic oil in the junction tube.

    BRIEF DESCRIPTION OF DRAWINGS



    [0011] 

    FIG. 1 is a side view showing the overall configuration of a hydraulic shovel according to an embodiment of the present invention.

    FIG. 2 is a perspective view enlargedly showing a part of a slewing frame of the hydraulic shovel of FIG. 1.

    FIG. 3 is a bottom view of a floor plate provided on the slewing frame of FIG. 2.

    FIG. 4 is a left side view showing a driver's seat provided on the floor plate of FIG. 3.

    FIG. 5 is a conceptual diagram showing a left side view of the floor plate of FIG. 3 and the amplitude of a natural vibration mode of the floor plate in a state where a rear reinforcement beam is not provided.

    FIG. 6 is a circuit diagram showing a part of a hydraulic system provided in the hydraulic shovel of FIG. 1.

    FIG. 7 is a bottom view showing the overall configuration of a junction tube of FIG. 6.

    FIG. 8 is a sectional view along line VIII-VIII of FIG. 7.

    FIG. 9A is a sectional view along line IXa-IXa of FIG. 8 and FIG. 9B is a sectional view along line IXb-IXb of FIG. 8.


    EMBODIMENT OF INVENTION



    [0012] Hereinafter, an embodiment of the present invention is described with reference to the accompanying drawings. Note that the following embodiment is a specific example of the present invention and is not of the nature to limit the technical scope of the present invention.

    [0013] FIG. 1 is a side view showing the overall configuration of a hydraulic shovel according to the embodiment of the present invention. Note that the following description is based on an up-and-down direction and a right-and-left direction viewed from a passenger in a cabin 6 of FIG. 1.

    [0014] With reference to FIG. 1, a hydraulic shovel 1 as an example of an operating machine includes a lower propelling body 2 with a crawler 2a, an upper slewing body 3 rotatably provided on this base carrier 2, an operating attachment 5 and the cabin 6 provided on a slewing frame 4 of this upper slewing body 3, and a hydraulic system 14 (see FIG. 6).

    [0015] The operation attachment 5 includes a boom 7 provided to be raised and lowered about a horizontal axis relative to the slewing frame 4, an arm 8 provided pivotably about a horizontal axis relative to a distal end part of this boom 7 and a bucket 9 mounted rotatably about a horizontal axis relative to a distal end part of this arm 8. The boom 7 is raised and lowered according to extension and contraction of a boom cylinder 10. The arm 8 pivots relative to the boom 7 according to extension and contraction of an arm cylinder 11. The bucket 9 rotates relative to the arm 8 according to extension and contraction of a bucket cylinder 12.

    [0016] FIG. 2 is a perspective view enlargedly showing a part of the slewing frame of the hydraulic shovel of FIG. 1.

    [0017] With reference to FIG. 2, a part for mounting the cabin 6 on the floor plate is provided at a front-left position on the slewing frame 4. Specifically, a pair of front and rear bases 4a, 4b extending in the right-and-left direction stand on the slewing frame 4. These bases 4a, 4b have the same right-and-left length, and mount mounting portions M1 to M4 used to mount a mount (not shown) for supporting a floor plate 15 (see FIG. 3) in a vibration-proof manner are provided on left and right end parts of the respective bases 4a, 4b.

    [0018] FIG. 3 is a bottom view of the floor plate 15 provided on the slewing frame of FIG. 2.

    [0019] With reference to FIG. 3, the floor plate 15 is made of a metal plate, the left and right edge parts of which are bent downwardly at an angle of 90° and which has a C-shaped front view and a substantially rectangular plan view. Four corners of this floor plate 15 are supported from blow by the mounts (mount mounting portions M1 to M4 are shown in FIG. 3) provided on the slewing frame. Further, the floor plate 15 is provided with a pair of left and right through holes 32a and 32b vertically penetrating to guide hydraulic tubes to be described later (tubes P1, P2, T1, T2, A1 to A4 of FIG. 2) to below the floor plate 15. The right through hole 32a is provided to the right of an arrangement position of a seat stand 37 (see FIG. 4) for holding a driver's seat 35 to be described later and next to a rear part of the arrangement position. The left through hole 32b is provided to the left of the arrangement position of the seat stand 37 and slightly projects backward from the arrangement position (more backward than the through hole 32b).

    [0020] Further, a front reinforcement beam (second reinforcement beam) 15a, a middle reinforcement beam (first reinforcement beam) 15b and a third reinforcement beam 15c respectively extending in the right-and-left direction are fixed to the floor plate 15. The front reinforcement beam 15a is provided before the seat stand 37. The middle reinforcement beam 15b is provided at a position overlapping a range where the seat stand 37 is supported (range where the driver's seat is supported) when viewed from above. The rear reinforcement beam 15c is provided behind the seat stand 37.

    [0021] The respective reinforcement beams 15a to 15c suppress vibration of the floor plate 15 utilizing the rigidity of these. Specifically, the front reinforcement beam 15a suppresses vibration of the floor plate 15 at the feet of an operator sitting on the driver's seat 35 (see FIG. 4) by being provided before the seat stand 37. In this way, the front reinforcement beam 15a contributes to a reduction in noise transmitted to the operator. The middle reinforcement beam 15b is provided at the position overlapping the range of the floor plate 15 where the driver's seat 35 is supported and which is weak (larger amplitude) against vibration due to the weight of the driver's seat 35. In this way, the middle reinforcement beam 15b contributes to an improvement in strength against vibration of the floor plate 15 by the rigidity of the middle reinforcement beam 15b. Further, the middle reinforcement beam 15b is provided below the seat stand 37, whereby vibration directly transmitted to the driver's seat 35 from the floor plate 15 is suppressed. In this way, the middle reinforcement beam 15b contributes to a reduction in noise transmitted to the operator. As shown in FIG. 5, the rear reinforcement beam 15c is provided at a position where vibration becomes particularly large on the floor plate 15 to which the middle reinforcement beam 15b is fixed. In this way, the rear reinforcement beam 15c more effectively suppresses vibration of the floor plate 15. FIG. 5 is a left side view of the floor plate 15 of FIG. 3 and a conceptual diagram showing the amplitude of a natural vibration mode of the floor plate 15 in a state where the rear reinforcement beam 15c is not provided. Note that a reference sign M0 denotes the mounts for supporting the floor plate 15. As shown in FIG. 5, the amplitude of the natural vibration mode is relatively small at the positions where the front reinforcement beam 15a and the middle reinforcement beam 15b are provided and in neighboring ranges before and after these positions. Contrary to this, the amplitude of the natural vibration mode becomes larger at a position near the mount M0 after the middle reinforcement beam 15b. Since the rear reinforcement beam 15c is provided at a position passing through a position Pk where the amplitude of the natural vibration mode becomes largest in this embodiment, vibration of the floor plate 15 can be effectively suppressed utilizing the rigidity of this rear reinforcement beam 15c.

    [0022] Since the specific configurations of the respective reinforcement beams 15a to 15c are respectively similar, the middle reinforcement beam 15b is described as an example with reference to FIG. 8. The middle reinforcement beam 15b is made of a metal plate extending in the right-and-left direction. Specifically, the middle reinforcement beam 15b includes a main body portion 33 substantially parallel to the floor plate 15 and a pair of front and rear leg portions 34 formed by bending front and rear edge parts of this main body portion 33 upwardly at an angle of 90°. This middle reinforcement beam 15b is welded with upper end parts of the respective leg portions 34 held in contact with the lower surface of the floor plate 15 so that a clearance is formed between the main body portion 33 and the lower surface of the floor plate 15. Further, the middle reinforcement beam 15b includes three holes 33a (see FIG. 3) vertically penetrating through the main body portion 33 and three nuts N each with an internally threaded portion concentrically arranged with the corresponding hole 33a. These nuts N are fixed to the upper surface of the main body portion 33 such as by welding between the main body portion 33 and the floor plate 15. Note that the holes 33a and the nuts N are not provided in the front reinforcement beam 15a and the rear reinforcement beam 15c.

    [0023] FIG. 4 is a left side view showing the driver's seat provided on the floor plate 15 of FIG. 3.

    [0024] With reference to FIGS. 3 and 4, the cabin 6 includes the seat stand (supporting member) 37 provided substantially at a central position of the floor plate 15 in the front-and- rear direction and the right-and-left direction, the driver's seat 35 provided on this seat stand 37, and operating levers 36 provided at both left and right sides of this driver's seat 35. The respective operating levers 36 adjust a pilot pressure via remote control valves 16, 17 to be described later. The seat stand 37 is in the form of a hollow box.

    [0025] FIG. 6 is a circuit diagram showing a part of the hydraulic system provided in the hydraulic shovel of FIG. 1.

    [0026] With reference to FIG. 6, the hydraulic system 14 supplies hydraulic oil discharged from a pilot pump 22 to pilot ports of hydraulic actuators such as the boom cylinder 10, the arm cylinder 11 and the bucket cylinder 12 via the remote control valves (operation valves) 16, 17. On the other hand, the hydraulic system collects the hydraulic oil led out from the pilot ports of the hydraulic actuators into a tank 23.

    [0027] Specifically, the hydraulic system 14 includes a tube P0 connected to the pilot pump 22, tubes P1 and P2 branched off from this tube P0, the remote control valves 16, 17 connected to these tubes P1, P2, a tube T0 connected to the tank 23, tubes T1 and T2 branched off from this tube T0 and connected to the respective remote control valves 16, 17, a junction tube 24 allowing communication of the tubes P1, P2 with the tube P0 and communication of the tubes T1, T2 with the tube T0, tubes A1 and A2 connecting the remote control valve 16 and the pilot ports of the hydraulic actuators, and tubes A3 and A4 connecting the remote control valve 17 and the pilot ports of the hydraulic actuators.

    [0028] The remote control valve 16 includes pilot valves 18 and 19. Further, the remote control valve 17 includes pilot valves 20 and 21. By inclining each operating lever 36, the opening of each pilot valve 18 to 21 is adjusted according to the direction and amount of inclination. In FIG. 6, two tubes (A1 and A2, A3 and A4) are shown as tubes connecting the operating lever 36 and the pilot ports of the hydraulic actuators for each operating lever 36. However, actually, a rotating operation and an arm bending operation are performed by the right operating lever 36 and a boom raising/lowering operation and a bucket pivoting operation are performed by the left operating lever 36. Thus, four tubes are actually provided as tubes connecting the operating lever 36 and the pilot ports of the hydraulic actuators for each operating lever 36. Further, four pilot valves are provided for each operating lever 36 in correspondence with the number of the tubes.

    [0029] FIG. 7 is a bottom view showing the overall configuration of the junction tube 24 of FIG. 6. FIG. 8 is a sectional view along line VIII-VIII of FIG. 7. FIG. 9A is a sectional view along line IXa-IXa of FIG. 8, and FIG. 9B is a sectional view along line IXb-IXb of FIG. 8.

    [0030] With reference to FIGS. 3 and 7 to 9, the junction tube 24 is fixed to the lower surface of the main body portion 33 of the middle reinforcement beam 15b at a substantially central position of the middle reinforcement beam 15b in the right-and-left direction in a non-contact state with the floor plate 15. Specifically, the junction tube 24 includes a base plate 25 to be fixed to the main body portion 33 of the middle reinforcement beam 15b and a tube main body 26 provided on the lower surface of this base plate 25. The base plate 25 is made of a substantially rectangular metal plate. This base plate 25 is provided with a pair of insertion holes 25a, 25b arranged in the right-and-left direction to each other in a front part of the base plate 25, and an insertion hole 25c provided behind the insertion hole 25b, the insertion holes 25a to 25c vertically penetrating through the base plate 25. These insertion holes 25a to 25c are provided at positions corresponding to the holes 33a of the middle reinforcement beam 15b and sized to enable insertion of the bolts B. The tube main body 26 includes a supporting column portion 29 standing on the base plate 25, pump-side connecting portions 27a to 27b respectively projecting forward, rightward, leftward and backward on the same plane from this supporting column portion 29, and tank-side connecting portions 28a to 28d respectively projecting forward, rightward, leftward and backward on the same plane from this supporting column portion 29 at positions above these pump-side connecting portions 27a to 27d. As shown in FIG. 8, by threadably engaging three bolts B inserted from below with the respective nuts N with washers W sandwiched, the junction tube 24 is fixed to the lower surface of the middle reinforcement beam 15b (main body portion 33). In this state, the pump-side connecting portions 27b, 27c and the tank-side connecting portions 28b, 28c are arranged to face an opposite direction of the right-and-left direction at positions where they slightly project backward from the middle reinforcement beam 15b. Specifically, the pump-side connecting portion 27b and the tank-side connecting portion 28b for connecting the tubes T1, P1 passing through the right through hole 32a are provided on the tube main body 26 (supporting column portion 29) to face rightward. On the other hand, the pump-side connecting portion 27c and the tank-side connecting portion 28c for connecting the tubes T2, P2 passing through the left through hole 32b are provided on the tube main body 26 (supporting column portion 29) to face leftward. Further, the pump-side connecting portion 27d and the tank-side connecting portion 28d are arranged to face backward at a position behind the middle reinforcement beam 15b. Specifically, the pump-side connecting portion 27d and the tank-side connecting portion 28d to be connected to the hydraulic pump and the tank arranged behind the tube main body 26 are provided on the tube main body 26 (supporting column portion 29) to face backward.

    [0031] The tube P0 is connected to the pump-side connecting portion 27d, the tube P1 is connected to the pump-side connecting portion 27b, and the tube P2 is connected to the pump-side connecting portion 27c. The respective tubes P0 to P2 communicate with each other via a communication passage 30 (see FIG. 9A) linking the interiors of the respective pump-side connecting portions 27a to 27d. On the other hand, the tube T0 is connected to the tank-side connecting portion 28d, the tube T1 is connected to the tank-side connecting portion 28b, and the tube T2 is connected to the tank-side connecting portion 28c. The respective tubes T0 to T2 communicate with each other via a communication passage 31 (see FIG. 9B) linking the interiors of the respective tank-side connecting portions 28a to 28d. Note that, in this embodiment, the pump-side connecting portion 27a and the tank-side connecting portion 28a on the front side are closed by blank plugs.

    [0032] An arrangement mode of the hydraulic tubing is described below with reference to FIGS. 2 to 4 and 8.

    [0033] The tubes P1, T1, A1 and A2 connected to the remote control valve 16 provided at the right side of the driver's seat 35 are guided to below the floor plate 15 through the through hole 32a formed in the floor plate 15. The tube P1 is connected to the pump-side connecting portion 27b of the junction tube 24. Further, the tube T1 is connected to the tank-side connecting portion 28b of the junction tube 24. The remaining tubes A1, A2 are guided to behind the cabin 6 as shown in FIG. 2.

    [0034] On the other hand, the tubes P2, T2, A3 and A4 connected to the remote control valve 17 provided at the left side of the driver's seat 35 are guided to below the floor plate 15 through the through hole 32b formed in the floor plate 15. The tube P2 is connected to the pump-side connecting portion 27c of the junction tube 24. Further, the tube T2 is connected to the tank-side connecting portion 28c of the junction tube 24. The remaining tubes A3, A4 are guided to behind the cabin 6 as shown in FIG. 2.

    [0035] The pump-side connecting portion 27d communicating with the pump-side connecting portions 27b, 27c is connected to the pilot pump 22 (see FIG. 6) arranged behind the cabin 6 via the tube P0. Further, the tank-side connecting portion 28d communicating with the tank-side connecting portions 28b, 28c is connected to the tank 23 (see FIG. 6) arranged behind the cabin 6 via the tube T0.

    [0036] In such an arrangement mode of the hydraulic tubing, the junction tube 24 for allowing communication of the respective tubes P1, P2, T1 and T2 is fixed to the middle reinforcement beam 15b in this embodiment. Thus, vibration of the floor plate 15 can be suppressed by the rigidity of the middle reinforcement beam 15b. Further, by providing the middle reinforcement beam 15b between the junction tube 24 and the floor plate 15, vibration transmitted from the junction tube 24 to the floor plate 15 can be alleviated.

    [0037] Note that, in this embodiment, the pump-side connecting portions 27b, 27c and the tank-side connecting portions 28b, 28c are respectively arranged to face outward in the right-and-left direction at the positions projecting backward from the middle reinforcement beam 15b as shown in FIGS. 3 and 7. Thus, necessary lengths of the tubes P0, P1, T0 and T1 to be connected to these connecting portions 27b, 27c, 28b and 28c can be shortened. Further, the pump-side connecting portion 27d to be connected to the pilot pump 22 and the tank-side connecting portion 28d to be connected to the tank 23 are arranged to face backward. Thus, necessary lengths of the tubes P0, T0 (see FIG. 6) from the pilot pump 22 and the tank 23 located behind the cabin 6 to the junction tube 24 can be shortened.

    [0038] As described above, according to this embodiment, the junction tube 24 is fixed to the middle reinforcement beam 15b fixed to the lower surface of the floor plate 15 in a non-contact state with the floor plate 15. Thus, noise transmitted to the operator due to pulsation of the hydraulic oil in this junction tube 24 can be suppressed. Specifically, since the middle reinforcement beam 15b extending in the right-and-left direction is provided in this embodiment, vibration of the floor plate 15 can be suppressed by the rigidity of the middle reinforcement beam 15b. In addition, since the junction tube 24 is indirectly fixed to the floor plate 15 via the middle reinforcement beam 15b, vibration transmitted from the junction tube 24 to the floor plate 15 can be reduced. Thus, according to this embodiment, not only vibration transmitted from the junction tube 24 to the floor plate 15 can be alleviated by the middle reinforcement beam 15b, but also vibration of the floor plate 15 can be suppressed by the rigidity of the middle reinforcement beam 15b even if vibration is transmitted from the junction tube 24 to the floor plate 15. Therefore, noise transmitted to the operator due to pulsation of the hydraulic oil in this junction tube 24 can be suppressed.

    [0039] In the above embodiment, the middle reinforcement beam 15b is provided at the position overlapping the range of the floor plate 15 where the driver's seat 35 (seat stand 37) is supported when viewed from above. According to this embodiment, noise transmitted to the operator can be effectively reduced while the floor plate 15 is effectively reinforced. Specifically, vibration of a relatively low frequency (hereinafter, referred to as low-frequency vibration) actually felt as a movement of the floor plate 15 by the operator and vibration of a relatively high frequency (hereinafter, referred to as high-frequency vibration) felt as noise by the operator are present as vibration produced in the floor plate 15. Here, if a heavy load such as the driver's seat 35 is provided on the floor plate 15, the amplitude of the low-frequency vibration becomes larger and a movement felt by the operator becomes larger due to the weight of the driver's seat 35 (including the seat stand 37). Contrary to this, low-frequency vibration produced in the floor plate 15 can be reduced by the rigidity of the middle reinforcement beam 15b by arranging the middle reinforcement beam 15b to overlap the range where the driver's seat 35 is supported as in the above embodiment. Further, in the above embodiment, the junction tube 24 that can serve as a generation source of the high-frequency vibration is provided on the middle reinforcement beam 15b arranged at the position overlapping the position where the driver's seat 35 is supported as described above. Thus, the high-frequency vibration from the junction tube 24 can be reduced by the weight of the driver's seat 35. Therefore, according to the above embodiment, noise transmitted to the operator can be effectively reduced by reducing high-frequency vibration while low-frequency vibration is reduced and the floor plate 15 is effectively reinforced.

    [0040] Further, in the above embodiment, the seat stand 37 provided above the junction tube 24 is in the form of a hollow box. Thus, high-frequency vibration from the junction tube 24 can be trapped in the interior space of the seat stand 37. This can suppress the transmission of the high-frequency vibration as noise to the operator.

    [0041] Furthermore, as shown in FIG. 3, the respective through holes 32a, 32b are formed at the positions in alignment with the seat stand 37 in the right-and-left direction or formed behind the seat stand 37 and the front reinforcement beam 15a extends in the right-and-left direction before the seat stand 37 in the above embodiment. According to this embodiment, by providing the front reinforcement beam 15a before the seat stand 37 (driver's seat 35), vibration of the floor plate 15 can be suppressed not only in the range below the seat stand 37, but also at the front side of the seat stand 37 (driver's seat 35), i.e. on the feet of the operator. Thus, noise transmitted to the operator can be more effectively reduced. In addition, the junction tube 24 is fixed to the middle reinforcement beam 15b provided behind the front reinforcement beam 15a and closer to the respective through holes 32a, 32b. Thus, as compared with the case where the junction tube 24 is fixed to the front reinforcement beam 15a, the pump-side tubes P1, P2 and the tank-side tubes T1, T2 extending from the junction tube 24 to be connected the respective remote control valves 16, 17 via the respective through holes 32a, 32b can be shortened. Therefore, according to the above embodiment, noise transmitted to the operator can be effectively reduced while the tubes P1, P2, T1 and T2 are shortened.

    [0042] In the above embodiment, the middle reinforcement beam 15b includes the main body portion 33 and the pair of front and rear leg portions 34, the upper end parts of the respective leg portions 34 are welded in contact with the lower surface of the floor plate 15 to form the clearance between the main body portion 33 and the floor plate 15, and the main body portion 33 includes the nuts N. According to this embodiment, the junction tube 24 can be fixed by the bolts B to the middle reinforcement beam 15b fixed to the floor plate 15 by welding. Thus, the junction tube 24 can be fixed without specially working the floor plate 15.

    [0043] In the above embodiment, as shown in FIG. 5, the rear reinforcement beam 15c is provided in a part Pk where the amplitude is largest in the natural vibration mode of the floor plate 15 to which the middle reinforcement beam 15b is fixed. Thus, vibration produced in the floor plate 15 can be more effectively reduced by the rigidity of this rear reinforcement beam 15c.

    [0044] In the above embodiment, on the tube main body 26 (supporting column portion 29) arranged between the pair of left and right through holes 32a, 32b, the connecting portions 27b, 28b to be connected to the tubes P1, T1 passing through the through hole 32a are provided to face rightward and the connecting portions 27c, 28c to be connected to the tubes P2, T2 passing through the through hole 32b are provided to face leftward. This enables distances from the through holes 32a, 32b to the connecting portions 27b, 27c, 28b and 28c to be shortened. Thus, the respective tubes P1, P2, T1 and T2 can be shortened.

    [0045] In the above embodiment, the connecting portions 27d, 28d are provided on the tube main body 26 (supporting column portion 29) to face rearward. This enables distances from the pilot pump 22 and the tank 23 provided behind the tube main body 26 to the connecting portions 27d, 28d to be shortened. Thus, the tubes P0, T0 connecting the pilot pump 22 and the tank 23 to the junction tube 24 can be shortened.

    [0046] Note that the specific embodiment described above mainly includes inventions having the following configurations.

    [0047] To solve the above problem, a hydraulic tubing support structure in an operating machine including a plurality of hydraulic actuators, to be provided by the present invention, includes a floor plate formed with a pair of left and right vertically penetrating through holes, a driver's seat provided on the floor plate, a pair of operating levers provided at both left and right sides of the driver's seat, a pair of left and right operation valves for generating pilot pressures for the plurality of hydraulic actuators in response to an input operation performed on each operating lever, a pair of left and right pump-side tubes respectively extending from the respective operation valves and guided to below the floor plate through the through holes, a pair of left and right tank-side tubes respectively extending from the respective operation valves and guided to below the floor plate through the through holes, a junction tube for allowing communication of the respective pump-side tubes guided to below the floor plate through the through holes and communication of the respective tank-side tubes guided to below the floor plate through the through holes, and a first reinforcement beam extending in a right-and-left direction and fixed to the lower surface of the floor plate, wherein the junction tube is fixed to the first reinforcement beam in a non-contact state with the floor plate.

    [0048] In the present invention, the junction tube is fixed to the first reinforcement beam fixed to the lower surface of the floor plate in the non-contact state with the floor plate. Thus, noise transmitted to an operator due to pulsation of hydraulic oil in the junction tube can be suppressed. Specifically, since the first reinforcement beam extending in the right-and-left direction is provided in the present invention, vibration of the floor plate can be suppressed by the rigidity of the first reinforcement beam. In addition, since the junction tube is indirectly fixed to the floor plate via the first reinforcement beam, vibration transmitted from the junction tube to the floor plate can be reduced. Thus, according to the present invention, not only vibration transmitted from the junction tube to the floor plate can be alleviated by the first reinforcement beam, but also vibration of the floor plate can be suppressed by the rigidity of the first reinforcement beam even if vibration is transmitted from the junction tube to the floor plate. Thus, noise transmitted to the operator due to pulsation of hydraulic oil in the junction tube can be suppressed.

    [0049] In the above hydraulic tubing support structure, at least a part of the first reinforcement beam is preferably provided at a position overlapping a range of the floor plate where the driver's seat is supported when viewed from above.

    [0050] In this aspect, noise transmitted to the operator can also be effectively reduced while the floor plate is effectively reinforced. Specifically, vibration of a relatively low frequency (hereinafter, referred to as low-frequency vibration) actually felt as a movement of the floor plate by the operator and vibration of a relatively high frequency (hereinafter, referred to as high-frequency vibration) felt as noise by the operator are present as vibration produced in the floor plate. Here, if a heavy load such as the driver's seat is provided on the floor plate, the amplitude of the low-frequency vibration becomes larger due to the weight of this driver's seat and a movement felt by the operator becomes larger. Contrary to this, low-frequency vibration produced in the floor plate can be reduced by the rigidity of the first reinforcement beam by arranging the first reinforcement beam to at least partly overlap the range where the driver's seat is supported as in the above aspect. Further, in the above aspect, the junction tube that can serve as a generation source of the high-frequency vibration is provided on the first reinforcement beam arranged at the position overlapping the position where the driver's seat is supported as described above. Thus, the high-frequency vibration from the junction tube can be reduced by the weight of the driver's seat. Therefore, according to this aspect, noise transmitted to the operator can be effectively reduced by reducing high-frequency vibration while low-frequency vibration is reduced and the floor plate is effectively reinforced.

    [0051] In the above hydraulic tubing support structure, preferably, each through hole is formed at a position in alignment with the driver's seat in the right-and-left direction or formed behind the position, and a second reinforcement beam extending in the right-and-left direction before the driver's seat and fixed to the lower surface of the floor plate is further provided.

    [0052] According to this aspect, vibration of the floor plate not only in the range below the driver's seat, but also at the front side of the driver's seat, i.e. on the feet of the operator can be suppressed by providing the second reinforcement beam before the driver's seat. Thus, noise transmitted to the operator can be more effectively reduced. In addition, the junction tube is fixed to the first reinforcement beam rearward provided closer to the respective through holes than the second reinforcement beam. Thus, as compared with the case where the junction tube is fixed to the second reinforcement beam, the pump-side tubes and the tank-side tubes extending from the junction tube to be connected to the respective operation valves via the respective through holes can be shortened. Therefore, according to the above aspect, noise transmitted to the operator can be effectively reduced while the pump-side tubes and the tank-side tubes are shortened.

    [0053] In the above hydraulic tubing support structure, preferably, a supporting member fixed to the upper surface of the floor plate and adapted to support the driver's seat is further provided, and the supporting member is a hollow member.

    [0054] According to this aspect, since the supporting member for supporting the driver's seat is a hollow member, high-frequency vibration from the junction tube can be trapped in the interior space of this supporting member. This can suppress the transmission of this high-frequency vibration as noise to the operator sitting on the driver's seat.

    [0055] In the above hydraulic tubing support structure, preferably, the first reinforcement beam includes a main body portion extending in the right-and-left direction and a pair of front and rear leg portions standing on this main body portion, upper end parts of the respective leg portions being welded to the lower surface of the floor plate to form a clearance between the main body portion and the floor plate, the main body portion is formed with an internally threaded portion with which a bolt is threadably engageable from below the main body portion, and the junction tube is fixed to the first reinforcement beam by the bolt threadably engaged with the internally threaded portion of the main body portion.

    [0056] According to this aspect, the junction tube can be fixed by the bolt to the first reinforcement beam fixed to the floor plate by welding by forming the internally threaded portion utilizing the clearance between the floor plate and the main body portion. Thus, the junction tube can be fixed without specially working the floor plate.

    [0057] The above hydraulic tubing support structure preferably further includes a third reinforcement beam extending in the right-and-left direction and fixed to the lower surface of the floor plate to pass a position where an amplitude peaks in a natural vibration mode of the floor plate to which the first reinforcement beam is fixed.

    [0058] According to this aspect, the third reinforcement beam is provided in a part of the floor plate having the first reinforcement beam fixed thereto where the amplitude becomes larger. Thus, vibration produced in the floor plate can be more effectively reduced by the rigidity of this third reinforcement beam.

    [0059] In the hydraulic tubing support structure, preferably, the junction tube includes a tube main body arranged between the pair of left and right through holes, a pair of right connecting portions for connection to the pump-side tube and the tank-side tube passing through the right through hole and a pair of left connecting portions for connection to the pump-side tube and the tank-side tube passing through the left through hole, the pair of right connecting portions are provided on the tube main body to face rightward, and the pair of left connecting portions are provided on the tube main body to face leftward.

    [0060] According to this aspect, on the tube main body arranged between the pair of left and right through holes, the pair of right connecting portions for connection to the tubes passing through the right through hole are provided to face rightward and the pair of left connecting portions for connection to the tubes passing through the left through hole are provided to face leftward. This enables distances from the respective through holes to the respective right connecting portions and the respective left connecting portions to be shortened. Thus, the pump-side tubes and the tank-side tubes can be shortened.

    [0061] In the above hydraulic tubing support structure, preferably, the junction tube further includes a pump-side connecting portion and a tank-side connecting portion for connection to tubes respectively connected to a hydraulic pump and a tank provided behind the tube main body, and the pump-side connecting portion and the tank-side connecting portion are respectively provided on the tube main body to face backward.

    [0062] According to this aspect, the pump-side connecting portion and the tank-side connecting portion are provided on the tube main body to face backward. This enables distances from the hydraulic pump and the tank provided behind the tube main body to the pump-side connecting portion and the tank-side connecting portion to be shortened. Thus, the tubes connecting the hydraulic pump and the tanks to the junction tube can be shortened.

    [0063] Further, the present invention provides an operating machine including the above hydraulic tubing support structure and a hydraulic pump and a tank to be connected to the junction tube.

    INDUSTRIAL APPLICABILITY



    [0064] According to the present invention, it is possible to reduce noise transmitted to an operator due to pulsation of hydraulic oil in a junction tube.

    REFERENCE SINGS LIST



    [0065] 
    B
    bolt
    M1
    mount mounting portion
    N
    nut
    P0 to P2
    tube
    T0 to T2
    tube
    1
    hydraulic shove (example of operating machine)
    10
    boom cylinder (example of hydraulic actuator)
    11
    arm cylinder (example of hydraulic actuator)
    12
    bucket cylinder (example of hydraulic actuator)
    15
    floor plate
    15a
    front reinforcement beam (second reinforcement beam)
    15b
    middle reinforcement beam (first reinforcement beam)
    15c
    rear reinforcement beam (third reinforcement beam)
    16, 17
    remote control valve (operation valve)
    22
    pilot pump (hydraulic pump)
    23
    tank
    24
    junction tube
    32a, 32b
    through hole
    33
    main body portion
    34
    leg portion
    35
    driver's seat
    36
    operating lever
    37
    seat stand (supporting member)



    Claims

    1. A hydraulic tubing support structure in an operating machine including a plurality of hydraulic actuators, comprising:

    a floor plate (15) formed with a pair of left and right vertically penetrating through holes (32a, 32b);

    a driver's seat (35) provided on the floor plate (15);

    a pair of operating levers (36) provided at both left and right sides of the driver's seat (35);

    a pair of left and right operation valves (16, 17) for generating pilot pressures for the plurality of hydraulic actuators in response to an input operation performed on each operating lever;

    a pair of left and right pump-side tubes (P1, P2) respectively extending from the respective operation valves (16, 17) and guided to below the floor plate (15) through the through holes (32a, 32b);

    a pair of left and right tank-side tubes (T1, T2) respectively extending from the respective operation valves (16, 17) and guided to below the floor plate (15) through the through holes (32a, 32b);

    a junction tube (24) for allowing communication of the respective pump-side tubes (P1, P2) guided to below the floor plate (15) through the through holes (32a, 32b) and communication of the respective tank-side tubes (T1, T2) guided to below the floor plate (15) through the through holes (32a, 32b); and

    a first reinforcement beam (15b) extending in a right-and-left direction and fixed to the lower surface of the floor plate (15),

    wherein the junction tube (24) is fixed to the first reinforcement beam (15b) in a non-contact state with the floor plate (15)

    characterized in that

    the first reinforcement beam (15b) includes a main body portion (33) extending in the right-and-left direction and a pair of front and rear leg portions (34) standing on this main body portion (33), upper end parts of the respective leg portions (34) being welded to the lower surface of the floor plate (15) to form a clearance between the main body portion (33) and the floor plate (15);

    the main body portion (33) is formed with an internally threaded portion (N) with which a bolt (B) is threadably engageable from below the main body portion (33); and

    the junction tube (24) is fixed to the first reinforcement beam (15b) by the bolt threadably engaged with the internally threaded portion of the main body portion (33).


     
    2. A hydraulic tubing support structure according to claim 1, wherein at least a part of the first reinforcement beam (15b) is provided at a position overlapping a range of the floor plate (15) where the driver's seat (35) is supported when viewed from above.
     
    3. A hydraulic tubing support structure according to claim 2, wherein:

    each through hole (32a, 32b) is formed at a position in alignment with the driver's seat (35) in the right-and-left direction or formed behind the position; and

    the hydraulic tubing support structure further comprises a front reinforcement beam (15a) extending in the right-and-left direction before the driver's seat (35) and fixed to the lower surface of the floor plate (15).


     
    4. A hydraulic tubing support structure according to claim 2 or 3, further comprising a supporting member (37) fixed to the upper surface of the floor plate (15) and adapted to support the driver's seat (35), wherein the supporting member (37) is a hollow member.
     
    5. A hydraulic tubing support structure according to any one of claims 1 to 4, further comprising a rear reinforcement beam (15c) extending in the right-and-left direction and fixed to the lower surface of the floor plate (15) to pass a position where an amplitude peaks in a natural vibration mode of the floor plate (15) to which the first reinforcement beam (15b) is fixed.
     
    6. A hydraulic tubing support structure according to any one of claims 1 to 5, wherein:

    the junction tube (24) includes a tube main body (26) arranged between the pair of left and right through holes (32a, 32b), a pair of right connecting portions for connection to the pump-side tube and the tank-side tube passing through the right through hole and a pair of left connecting portions for connection to the pump-side tube and the tank-side tube passing through the left through hole; and

    the pair of right connecting portions are provided on the tube main body (26) to face rightward and the pair of left connecting portions are provided on the tube main body (26) to face leftward.


     
    7. A hydraulic tubing support structure according to claim 6, wherein:

    the junction tube (24) further includes a pump-side connecting portion (27a to 27d) and a tank-side connecting portion (28a to 28d) for connection to tubes respectively connected to a hydraulic pump (22) and a tank (23) provided behind the tube main body (26); and

    the pump-side connecting portion (27a to 27d) and the tank-side connecting portion (28a to 28d) are respectively provided on the tube main body (26) to face backward.


     
    8. An operating machine, comprising:

    a hydraulic tubing support structure according to any one of claims 1 to 7; and

    a hydraulic pump (22) and a tank (23) to be connected to the junction tube (24).


     


    Ansprüche

    1. Stützstruktur für Hydraulikschläuche in einer Betriebsmaschine mit einer Vielzahl von Hydraulikaktoren, die Folgendes aufweist:

    eine Bodenplatte (15), die mit einem Paar von linken und rechten, vertikal durchdringenden Durchgangslöchern (32a, 32b) ausgebildet ist;

    einen Fahrersitz (35), der auf der Bodenplatte (15) vorgesehen ist;

    ein Paar von Betätigungshebeln (36), die sowohl links als auch rechts vom Fahrersitz (35) vorgesehen sind;

    ein Paar von linken und rechten Betätigungsventilen (16, 17) zum Erzeugen von Steuerdrücken für die Vielzahl von Hydraulikaktoren als Reaktion auf eine Eingabebetätigung, die an jedem Betätigungshebel ausgeführt wird;

    ein Paar von linken und rechten pumpenseitigen Schläuchen (P1, P2), die sich jeweils von den jeweiligen Betätigungsventilen (16, 17) aus erstrecken und durch die Durchgangslöcher (32a, 32b) bis unter die Bodenplatte (15) geführt werden;

    ein Paar von linken und rechten tankseitigen Schläuchen (T1, T2), die sich jeweils von den jeweiligen Betätigungsventilen (16, 17) aus erstrecken und durch die Durchgangslöcher (32a, 32b) bis unter die Bodenplatte (15) geführt werden;

    ein Verbindungsschlauch (24) zum Ermöglichen der Verbindung der jeweiligen pumpenseitigen Schläuche (P1, P2), die unterhalb der Bodenplatte (15) durch die Durchgangslöcher (32a, 32b) geführt sind, und der Verbindung der jeweiligen tankseitigen Schläuche (T1, T2), die unterhalb der Bodenplatte (15) durch die Durchgangslöcher (32a, 32b) geführt sind; und

    einen ersten Verstärkungsbalken (15b), der sich in einer Rechts- und Linksrichtung erstreckt und an der Unterseite der Bodenplatte (15) befestigt ist,

    wobei der Verbindungsschlauch (24) an dem ersten Verstärkungsbalken (15b) in einem berührungslosen Zustand mit der Bodenplatte (15) befestigt ist.
    dadurch gekennzeichnet, dass

    der erste Verstärkungsbalken (15b) einen Hauptkörperabschnitt (33), der sich in der Rechts-Links-Richtung erstreckt, und ein Paar von vorderen und hinteren Beinabschnitten (34) aufweist, die auf diesem Hauptkörperabschnitt (33) stehen, wobei obere Endabschnitte der jeweiligen Beinabschnitte (34) mit der Unterseite der Bodenplatte (15) verschweißt sind, um einen Abstand zwischen dem Hauptkörperabschnitt (33) und der Bodenplatte (15) zu bilden;

    der Hauptkörperabschnitt (33) mit einem Innengewindeabschnitt (N) ausgebildet ist, mit dem eine Schraube (B) von unterhalb des Hauptkörperabschnitts (33) gewindewirksam in Eingriff bringbar ist; und

    der Verbindungsschlauch (24) am ersten Verstärkungsbalken (15b) durch die Schraube befestigt ist, die mit dem Innengewindeabschnitt des Hauptkörperabschnitts (33) gewindeartig in Eingriff steht.


     
    2. Stützstruktur für Hydraulikschläuche nach Anspruch 1, wobei mindestens ein Teil des ersten Verstärkungsbalkens (15b) an einer Position vorgesehen ist, die einen Bereich der Bodenplatte (15) überlappt, in dem der Fahrersitz (35) von oben gesehen gestützt wird.
     
    3. Stützstruktur für Hydraulikschläuche nach Anspruch 2, wobei:

    jedes Durchgangsloch (32a, 32b) an einer Position in Ausrichtung mit dem Fahrersitz (35) in der Rechts-Links-Richtung oder hinter der Position ausgebildet ist; und

    die Stützstruktur für Hydraulikschläuche ferner einen vorderen Verstärkungsbalken (15a) umfasst, der sich in der Rechts-Links-Richtung vor dem Fahrersitz (35) erstreckt und an der Unterseite der Bodenplatte (15) befestigt ist.


     
    4. Stützstruktur für Hydraulikschläuche nach Anspruch 2 oder 3, ferner mit einem Stützelement (37), das an der Oberseite der Bodenplatte (15) befestigt ist und dazu ausgelegt ist, den Fahrersitz (35) zu stützen, wobei das Stützelement (37) ein hohles Element ist.
     
    5. Stützstruktur für Hydraulikschläuche nach einem der Ansprüche 1 bis 4, ferner mit einem hinteren Verstärkungsbalken (15c), der sich in der Rechts-Links-Richtung erstreckt und an der Unterseite der Bodenplatte (15) befestigt ist, um eine Position zu passieren, an der eine Amplitude in einem Eigenschwingmode der Bodenplatte (15), an der der erste Verstärkungsbalken (15b) befestigt ist, ihren Höchstwert erreicht.
     
    6. Stützstruktur für Hydraulikschläuche nach einem der Ansprüche 1 bis 5, wobei:

    der Verbindungsschlauch (24) einen Schlauchhauptkörper (26), der zwischen dem Paar von linken und rechten Durchgangslöchern (32a, 32b) angeordnet ist, ein Paar von rechten Verbindungsabschnitten zur Verbindung mit dem pumpenseitigen Schlauch und dem tankseitigen Schlauch, der durch das rechte Durchgangsloch verläuft, und ein Paar von linken Verbindungsabschnitten zur Verbindung mit dem pumpenseitigen Schlauch und dem tankseitigen Schlauch, der durch das linke Durchgangsloch verläuft, aufweist; und

    das Paar der rechten Verbindungsabschnitte an dem Schlauchhauptkörper (26) nach rechts gerichtet vorgesehen ist und das Paar der linken Verbindungsabschnitte an dem Schlauchhauptkörper (26) nach links gerichtet vorgesehen ist.


     
    7. Stützstruktur für Hydraulikschläuche nach Anspruch 6, wobei:

    der Verbindungsschlauch (24) ferner einen pumpenseitigen Verbindungsabschnitt (27a bis 27d) und einen tankseitigen Verbindungsabschnitt (28a bis 28d) zur Verbindung mit Schläuchen beinhaltet, die jeweils mit einer Hydraulikpumpe (22) und einem hinter dem Schlauchhauptkörper (26) vorgesehenen Tank (23) verbunden sind; und

    der pumpenseitige Verbindungsabschnitt (27a bis 27d) und der tankseitige Verbindungsabschnitt (28a bis 28d) jeweils am Schlauchhauptkörper (26) nach hinten gerichtet vorgesehen sind.


     
    8. Eine Arbeitsmaschine, umfassend:

    eine Stützstruktur für Hydraulikschläuche nach einem der Ansprüche 1 bis 7; und

    eine Hydraulikpumpe (22) und einen Tank (23), der mit dem Verbindungsschlauch (24) zu verbinden ist.


     


    Revendications

    1. Structure de support de tubulaire hydraulique dans une machine d'actionnement comportant une pluralité d'actionneurs hydrauliques, comprenant :

    une plaque de plancher (15) formée d'une paire de trous traversants (32a, 32b) pénétrant verticalement gauche et droit ;

    un siège du conducteur (35) prévu sur la plaque de plancher (15) ;

    une paire de leviers d'actionnement (36) prévus au niveau des deux côtés gauche et droit du siège du conducteur (35) ;

    une paire de vannes d'actionnement (16, 17) gauche et droite pour générer des pressions pilotes pour la pluralité d'actionneurs hydrauliques en réponse à un actionnement d'entrée effectué sur chaque levier d'actionnement ;

    une paire de tubes côté pompe (P1, P2) gauche et droit s'étendant respectivement à partir des vannes d'actionnement (16, 17) respectives et guidés vers le dessous de la plaque de plancher (15) à travers les trous traversants (32a, 32b) ;

    une paire de tubes côté réservoir (T1, T2) gauche et droit s'étendant respectivement à partir des vannes d'actionnement (16, 17) respectives et guidés vers le dessous de la plaque de plancher (15) à travers les trous traversants (32a, 32b) ;

    un tube de jonction (24) pour assurer la communication des tubes côté pompe (P1, P2) respectifs guidés vers le dessous de la plaque de plancher (15) à travers les trous traversants (32a, 32b) et la communication des tubes côté réservoir (T1, T2) respectifs guidés vers le dessous de la plaque de plancher (15) à travers les trous traversants (32a, 32b) ; et

    une première poutre de renfort (15b) s'étendant dans une direction de droite à gauche et fixée à la surface inférieure de la plaque de plancher (15),

    dans laquelle le tube de jonction (24) est fixé à la première poutre de renfort (15b) dans un état sans contact avec la plaque de plancher (15),

    caractérisée en ce que

    la première poutre de renfort (15b) comporte une portion de corps principal (33) s'étendant dans la direction de droite à gauche et une paire de portions de pied (34) avant et arrière reposant sur cette portion de corps principal (33), des parties d'extrémité supérieure des portions de pieds (34) respectives étant soudées à la surface inférieure de la plaque de plancher (15) pour former un espace libre entre la portion de corps principal (33) et la plaque de plancher (15) ;

    la portion de corps principal (33) est formée d'une portion filetée de manière interne (N) avec laquelle un boulon (B) peut être mis en prise de manière filetée depuis le dessous de la portion de corps principal (33) ; et

    le tube de jonction (24) est fixé à la première poutre de renfort (15b) par le boulon mis en prise de manière filetée avec la portion filetée de manière interne de la portion de corps principal (33).


     
    2. Structure de support de tubulure hydraulique selon la revendication 1, dans laquelle au moins une partie de la première poutre de renfort (15b) est prévue à une position chevauchant une plage de la plaque de plancher (15) où le siège du conducteur (35) est supporté lorsqu'il est vu du dessus.
     
    3. Structure de support de tubulure hydraulique selon la revendication 2, dans laquelle :

    chaque trou traversant (32a, 32b) est formé à une position en alignement avec le siège du conducteur (35) dans la direction de droite à gauche ou formé derrière la position ; et

    la structure de support de tubulure hydraulique comprend en outre une poutre de renfort avant (15a) s'étendant dans la direction droite et gauche devant le siège de conducteur (35) et fixée à la surface inférieure de la plaque de plancher (15).


     
    4. Structure de support de tubulure hydraulique selon la revendication 2 ou 3, comprenant en outre un élément de support (37) fixé à la surface supérieure de la plaque de plancher (15) et adapté pour supporter le siège du conducteur (35), dans laquelle l'élément de support (37) est un membre creux.
     
    5. Structure de support de tubulure hydraulique selon l'une quelconque des revendications 1 à 4, comprenant en outre une poutre de renfort arrière (15c) s'étendant dans la direction droite et gauche et fixée à la surface inférieure de la plaque de plancher (15) pour passer d'une position où une amplitude culmine dans un mode de vibration propre de la plaque de plancher (15) à laquelle la première poutre de renfort (15b) est fixée.
     
    6. Structure de support de tubulure hydraulique selon l'une quelconque des revendications 1 à 5, dans laquelle :

    le tube de jonction (24) comporte un corps principal de tube (26) agencé entre la paire de trous traversants (32a, 32b) gauche et droit, une paire de portions de liaison droites pour être reliées au tube côté pompe et au tube côté réservoir passant à travers le trou traversant droit et une paire de portions de liaison gauches pour être reliées au tube côté pompe et au tube côté réservoir passant à travers le trou traversant gauche ; et

    la paire de portions de liaison droites sont prévues sur le corps principal de tube (26) pour être orientées vers la droite et la paire de portions de liaison gauches sont prévues sur le corps principal de tube (26) pour être orientées vers la gauche.


     
    7. Structure de support de tubulure hydraulique selon la revendication 6, dans laquelle :

    le tube de jonction (24) comporte en outre une portion de liaison côté pompe (27a à 27d) et une portion de liaison côté réservoir (28a à 28d) pour être reliées à des tubes reliés respectivement à une pompe hydraulique (22) et à un réservoir (23) prévus derrière le corps principal de tube (26) ; et

    la portion de liaison côté pompe (27a à 27d) et la portion de liaison côté réservoir (28a à 28d) sont respectivement prévues sur le corps principal de tube (26) pour être orientées vers l'arrière.


     
    8. Machine d'actionnement comprenant :

    une structure de support de tubulure hydraulique selon l'une quelconque des revendications 1 à 7 ; et

    une pompe hydraulique (22) et un réservoir (23) devant être reliés au tube de jonction (24).


     




    Drawing






























    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description