(19)
(11)EP 2 104 777 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
03.10.2018 Bulletin 2018/40

(21)Application number: 07755408.7

(22)Date of filing:  12.04.2007
(51)International Patent Classification (IPC): 
F01B 23/00(2006.01)
B25B 27/10(2006.01)
F04B 1/14(2006.01)
H01R 43/00(2006.01)
F01B 3/00(2006.01)
(86)International application number:
PCT/US2007/009125
(87)International publication number:
WO 2007/130258 (15.11.2007 Gazette  2007/46)

(54)

HYDRAULIC TOOL WITH WOBBLE PLATE TRANSMISSION

HYDRAULISCHES WERKZEUG MIT TAUMELSCHEIBENGETRIEBE

OUTIL HYDRAULIQUE DOTÉ D'UNE TRANSMISSION À PLATEAU OSCILLANT


(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

(30)Priority: 04.05.2006 US 429039

(43)Date of publication of application:
30.09.2009 Bulletin 2009/40

(73)Proprietor: Hubbell Incorporated
Shelton, CT 06484 (US)

(72)Inventors:
  • LEFAVOUR, John, D.
    Litchfield, New Hampshire 03052 (US)
  • MONTMINY, Armand, T.
    Manchester, New Hampshire 03104 (US)
  • FAUCHER, Thomas, R.
    Manchester, New Hampshire 03102 (US)

(74)Representative: Overath, Philippe et al
Cabinet Bede Boulevard Général Wahis 15
1030 Bruxelles
1030 Bruxelles (BE)


(56)References cited: : 
GB-A- 842 360
US-A- 2 402 244
US-A- 4 583 921
US-A- 5 727 417
US-B1- 6 453 719
US-A- 2 402 244
US-A- 4 280 359
US-A- 5 063 829
US-A- 6 098 519
US-B1- 6 453 719
  
      
    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

    BACKGROUND OF THE INVENTION


    Field of the Invention



    [0001] The invention relates to a hydraulic1 tool and, more particularly, to a hydraulic tool having a transmission with a wobble plate.

    Brief Description of Prior Developments



    [0002] U.S. Patent No. 5,727,417 discloses a portable battery powered crimper having a transmission with a wobble plate. U.S. Patent No. 6,162,024 discloses a wobble plate connected to the shaft by a member with an angled front face.

    [0003] One problem that can be encountered with conventional pumps having a wobble plate transmission is in regard to vibrations due to the irregular shape of the wobble plate or driving bevel disk for the wobble plate. There is a need for a design which can operate at higher rotational speeds without substantial vibrations and resulting wear.

    [0004] GB-A-842360 discloses a hydraulic tool comprising a motor, a hydraulic pump with a reciprocating piston member, and a transmission between the motor and the hydraulic pump. The transmission comprises a wobble plate and a spring. The wobble plate comprises a front end pivotably connected to a frame of the pump. The piston member is located in a piston channel of the frame of the pump. A rear end of the piston member is located against the front end of wobble plate. The pump is driven by the rotation of the shaft of a motor. The pump is provided with a system for preventing the wobble plate to rotate due to the rotation of the shaft, said system comprising radius rods with springs acting on a boss of the wobble plate in a direction transversal with respect to the axis of rotation of the shaft driven into rotation by the motor.

    [0005] US-A-5063829 discloses a variable displacement swash plate compressor. The compressor comprises an axial piston machine with a bevel disk with a balance pocket balancing the weight of the bevel disk about the axis of rotation.

    SUMMARY OF THE INVENTION



    [0006] The invention relates to a hydraulic tool as claimed in claim 1.

    [0007] The hydraulic tool is provided including a motor; a hydraulic pump comprising only one reciprocating piston pump member; and a transmission connecting the motor to the hydraulic pump. The transmission includes a wobble plate and at least one spring. The wobble plate includes a front end pivotably connected to a frame of the pump.

    [0008] A rear end of the piston pump member is located against the front end of the wobble plate. The spring is spaced from the piston pump member and applies a biasing force against the front end of the wobble plate.

    [0009] The transmission comprises a wobble plate. The wobble plate is prevented from axially rotating by a rotation preventing system comprising a key member connected to the wobble plate and interlocking the wobble plate with a frame of the tool to prevent axial rotation of the wobble plate relative to the frame.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0010] The foregoing aspects and other features of the invention are explained in the following description, taken in connection with the accompanying drawings, wherein :

    Fig. 1 is an elevational side view of a battery operated, hydraulic tool incorporating features of the invention;

    Fig. 2 is a side view of the tool shown in Fig. 1 with a cut away view of the housing;

    Fig. 3 is a partial cross sectional view of some of the components of the tool shown in Figs. 1 and 2;

    Fig. 4 is an enlarged view of portions of the pump and the transmission shown in Fig. 3;

    Fig. 5 is a perspective view of the bevel disk shown in Fig. 4;

    Fig. 6 is a perspective view of the bevel disk shown in Fig. 5 from a different direction;

    Fig. 7 is a perspective view of the wobble plate shown in Fig. 4;

    Fig. 8 is a perspective view of the wobble plate shown in Fig. 7 from a different direction;

    Fig. 9 is a perspective view of an alternate embodiment 'of the wobble plate; and

    Fig. 10 is a front elevational view of another alternate embodiment of the wobble plate.


    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS



    [0011] Referring to Fig. 1, there is shown an elevational side view of a tool 10 incorporating features of the invention. Although the invention will be described with reference to the exemplary embodiments shown in the drawings, it should be understood that the invention as claimed in the attached claims can be embodied in many alternate forms of embodiments. In addition, any suitable size, shape or type of elements or materials could be used.

    [0012] The tool 10 is a hydraulically operated, battery powered tool. However, features of the invention could be used in a non-battery operated tool. The tool 10 is a crimping tool for crimping an electrical connector onto a conductor, such as an electrical cable for example. However, features of the invention could be used in any suitable type of hydraulically operated tool, such as a .cutting tool for example .

    [0013] Referring also to Fig. 2, the tool 10 generally comprises a pump 12, a motor 14, a transmission 16 connecting the motor to the pump, a battery 18, a fluid reservoir 20, a working head 22, and a housing 24. Any suitable type of user actuated control (not shown), such as push buttons or a rocker switch for example, could be provided on the housing 24. Referring also to Figs. 3, the working head 22, in this embodiment, comprises a frame 26, two jaws 28 and rollers 30. However, in alternate embodiments any suitable type of working head could be provided. The jaws 28 are pivotably connected to the frame 26 at a pivot connection 32. The front ends of the jaws are adapted to removably receive crimping dies. The rollers 30 are located against the rear ends of the jaws 28; between the jaws. The pivot connection 32 could comprise a spring to bias the jaws 28 towards an open position when the ram 34 is in a rearward position.

    [0014] The pump 12 comprises a frame 36. The frame 36 has a front end which forms a ram cylinder 38. The ram 34 is located in the ram cylinder 38 and biased towards a rearward position by a ram spring 40. The front end of the ram 34 is located against the rollers 30. The ram 34 can be moved forward by hydraulic fluid to move the rollers 30 forward and, thus, spread the rear ends of the jaws 28 apart. This causes the front ends of the jaws to be moved towards each other. The frame 36 forms hydraulic conduits from a piston channel 42 to the rear end of the ram at the ram cylinder 38. Various check valves and a release and/or relief valve are also preferably located in the hydraulic conduits. An exterior side of the frame 36 also forms part of the reservoir 20. A bladder 44 is attached at an annular recess 46 of the frame 36 to form the reservoir 20. However, in an alternate embodiment any suitable type of hydraulic fluid reservoir or hydraulic fluid supply could be provided.

    [0015] Referring also to Fig. 4, the pump 12 comprises a piston pump member 48 located in the piston channel 42. The piston pump member 48 extends out of the rear end of the frame 36 and is biased outward by a spring 50. The piston member 48 is arranged in the piston channel 42 for reciprocating forward and backward movement. As the piston member 48 moves rearward it draws hydraulic fluid into the piston chamber from the reservoir. As the piston member 48 moves forward, it pushes that hydraulic fluid towards the ram cylinder.

    [0016] The rear end of the frame 36 comprises a pivot member hole 52 and at least one spring hole 54. A pivot member 56 is pivotably located, in the hole 52. In this embodiment the pivot member 56 is a ball. However, in alternate embodiments any suitable pivotable connection of the wobble plate 60 to the rear end of the frame 36 could be provided. A spring 58, such as a coil spring, is located in each of the holes 54. In this embodiment only one coil spring 58 is provided. However, in alternate embodiments two to five coil springs could be provided. The spring 58 is located on an opposite side of the rear end of the frame 36 with the pivot member 56 therebetween.

    [0017] The transmission 16 comprises the wobble plate 60, a transmission case 62, a bevel disk 64 and a gearbox 66. As seen in Fig. 3, the gearbox 66 is connected to an output shaft of the motor 14. The bevel disk 64 is connected to an output shaft 68 of the gearbox. Referring also to Figs. 5 and 6, the bevel disk 64 has a general disk shape with a front end 70 and a rear end 72. The rear end 72 has a shaft bore 74 which receives the shaft 68. In this embodiment the shaft 68 has a general "D" shaped cross section. The bore 74 has a mating general "D" shaped cross section. Thus, the shapes can form a slip fit keying or mating configuration to impart rotational movement of the shaft 68 to the bevel disk 64. However, in alternate embodiments, any suitable keying or locking configuration could be provided. The rear end 72 forms an outer perimeter surface 76 and a rear facing shelf surface 78.

    [0018] The front end 70 of the bevel disk 64 has an angled front face 80 which is seen best in Fig. 4. The face 80 is angled relative to the center axis 84. The front end 70 also comprises a counter balance pocket 82. In this embodiment the counter balance pocket 82 extends into the front face 80; primarily at the thicker bottom portion of the bevel disk 64. However, in an alternate embodiment more than one counter balance pocket could be provided, and/or the pocket (s) could extend into the bevel disk other than at the front face 80. In this embodiment the pocket 82 has a contoured shape. This contoured shape is provided to generally rotationally balance the disk 64 about its rotational center axis 84.

    [0019] As seen best in Fig. 4, the bevel disk 64 is mounted in the transmission case 62 by a radial bearing 86 and an axial bearing 88 for rotational movement. The radial bearing 86 could comprise a radial ball bearing for example. The radial bearing 86 is located against the outer perimeter 90 of the front end 70. The axial bearing 88 could comprise a thrust bearing and thrust washers for example. The axial bearing 88 is located against the rear facing shelf surface 78 of the bevel disk 64.

    [0020] Referring also to Figs. 7-8, the wobble plate 60 is located in front of the bevel disk 64. The wobble plate 60 comprises a rear end 92 and a front end 94. The rear end 92 comprises a rear end projection 96 forming a perimeter surface 98 and a rearward facing shelf surface 100. The front end 94 has a front face with a center pivot pocket 102, a pump pocket 104 and five spring pockets 106. In an alternate embodiment, the front end 94 could have less than five spring pockets 106, such as only one spring pocket for example.

    [0021] The front end 94 of the wobble plate 60 is located opposite the rear end of the pump's frame 36. The pivot ball 56 (see Fi.g. 4) is located, in the hole 52 and the pocket 102 to pivotably connect the wobble plate 60 to the frame 36. In an alternate embodiment, any suitable pivotable connection could be provided-, such as the pivot member 56 being integrally formed with the frame 36 or the wobble plate 60 for example. The spring 58 is located in the spring pocket 106a; on the opposite side of the front face from the pump pocket 104. However, in alternate embodiments, at least one other spring could be located in the one or more of the other spring pockets 106. The rear end of the piston pump member 48 is located in the pump' pocket 104. The pump spring 50 keeps the rear end of the piston pump member 48 located in the pump pocket 104. The curved shape of the pump pocket 104 and rear end of the piston pump member 48 allow rotational sliding motion between the members 48, 60 as the wobble plate moves and the piston pump member 48 reciprocates in and out of the channel 42. The springs 50, 54 preferably balances out each others' biasing force .

    [0022] The engagement of the spring (s) 54 and the piston pump member 48 in the pockets 104, 106, in addition to their primary functions, also perform a secondary function of forming a system for preventing the wobble plate 60 from axially rotating. However, in alternate embodiments, additional means for preventing the wobble plate from axially rotating could be provided.

    [0023] A bearing 108 is provided on the rear end projection 96. The bearing 108 is located between the front, face 80 of the bevel disk 64 and the shelf surface 100 of the rear end of the wobble plate 60. The bearing 108 allows the bevel disk 64 to axially rotate relative to the wobble plate 60 without the wobble plate 60 axially rotating. However, because the front face 80 of the bevel disk 64 is angled relative to its axis of rotation 84, rotation of the bevel disk 64 causes the wobble plate to pivot on the pivot member 56; effectively wobbling as the bevel disk 64 rotates. This wobbling motion causes the piston pump member 48 to reciprocally move in and out of the channel 42. Thus, rotational motion provided by the output shaft of the motor 14 can be converted into reciprocal motion of the piston pump member, and hydraulic fluid can be pumped by the pump to the ram cylinder.

    [0024] Referring also to Fig. 9, an alternate embodiment of the wobble plate is shown. In this embodiment the wobble plate 110 is substantially identical to the wobble plate 60. However, the wobble plate 110 comprises screw keys 112 (only one of which is shown) which are screwed into outer perimeter holes 114 of the wobble plate 110. The screw keys 112 cooperate with the transmission case 62 to prevent the wobble plate 110 from axially rotating. This could be in addition to the springs 58 and piston pump member 48 preventing the wobble plate from axially rotating. In another alternate design, springs could be placed on the outer perimeter of the wobble plate.

    [0025] Referring also to Fig. 10, another alternate embodiment of the wobble plate is shown. In this embodiment, the front face 116 of .the wobble plate. 118 has a center pivot pocket 120, one pump pocket 122 and only two spring pockets 124. The pump pocket 122 and spring pockets 124 are equally spaced about the center pivot pocket 120 at 120° apart. The outer pockets 122, 124 are spaced at a center-to-center spacing from the center pivot pocket 120 at about 0.4 inch apart. However, in alternate embodiments, any suitable configuration and spacing could be provided.

    [0026] With the invention, the motor 14 and transmission 16 could produce a relatively high rotational speed, such as about 17,000 rpm at 151 Watts and 13.5 Amps with a 14.4 Volt battery for example. With no load, the ram 34 could be moved its stroke length of about 0.7 inch in about 3.48 seconds for example. The bearing 86 should preferably be able to accommodate a 60 lbs load, and the bearings 88, 108 should preferably be able to accommodate a 600 lbs thrust. The distance between the forward most part of the front face 80 and the rearward most part of the front face 80 could be any suitable distance to give a pump stroke of the piston pump member of any suitable distance. These are only some examples. Any suitable configurations could be provided .

    [0027] The invention can relate to a battery powered hydraulic crimp tool or cutting tool. However, the invention could alternatively be used for other applications such as swaging tools, punching tools, etc. which use a hydraulic pump drive with a wobble plate transmission .

    [0028] The bevel disk/wobble plate drive system turns rotary motion into liner motion. Rotary motion is provided by the electric motor which inputs rotary motion to the gearbox. As a result the gearbox output shaft rotates. The gearbox output shaft is preferably of "D" shape (male) geometry and provides a slip fit coupling into the bevel disk which has a "D" shape (female) geometry receiving channel . When the gearbox output shaft rotates it causes the bevel disk to rotate. As the bevel disk rotates the angled face on the bevel disk causes the wobble plate to pivot about the ball. The ball can be a 5/16 inch diameter ball for example. The wobble plate does not rotate as does the bevel disk. The wobble plate is fixed from rotation via the five spring pockets and pump pocket. These pockets contain either a spring or pump member that act as wobble plate anti-rotation devices . There can exist a plurality of springs including one pump spring and five wobble plate springs that when operating provide a force varying from approximately four to ten pounds per spring. The wobble plate springs and pump member act as an anti-rotation device. In addition the combined spring forces keep the wobble plate in close contact to the thrust bearings and thrust washers . The thrust bearing and thrust washers captured between the bevel disk and wobble plate can provide a near frictionless surface and, therefore, the wobble plate is subjected to a relatively small amount of torque .

    [0029] With only a small amount of torque applied to the wobble plate, the interlocking springs and pump prevent the wobble plate from rotating. However, the wobble plate can pivot about the 5/16 inch diameter ball. As the wobble plate pivots about the 5/16 inch diameter ball, the pump member moves 'inward and outward. This inward/outward linear motion is required to pump hydraulic oil/fluid, as the pump is moved in a direction as portrayed in the drawing, fluid is pumped to the cylinder chamber through an outlet check valve (not shown) . As the pump is moved in the opposite direction (not shown) fluid is drawn from the annular reservoir through the inlet check ball. When the pump reverses direction fluid is then once again pumped across the outlet check valve to the cylinder. As the fluid is pumped to the cylinder, the ram moves outward, advancing the two cylindrical rollers, spreading the crimp jaws rear section, and closing the front jaw section on the work piece. As the crimp or cut nears completion, a pressure relief valve (not shown) reaches a predetermined pressure setting and releases high pressure fluid back to the reservoir. An audible noise signals the operator that the work cycle is completed and the operator releases the activation switch (turn the electric motor off) . Any remaining fluid/pressure can manually be drained back to the reservoir through a manual release or in some cases an automatic drain valve. When either method is employed, the ram compression spring returns the ram to the home position (as shown) and the tool is once again ready for the next cycle.

    [0030] The bevel disk is supported radially on the outer diameter by two radial ball bearings and axially by thrust bearings and thrust washers. The bevel disk as portrayed is designed to operate at speeds of approximately 1000-1500 rpm. Since the bevel disk rotates at relatively high speed it is desirable to have a balanced bevel disk. Unique to the bevel disk shown is a counter 'balance pocket cut into the angled face of the bevel disk. This counter balance pocket is of specific geometry to balance the inertia of the bevel disk for rotation of relatively high speed. This feature will make a smoother operating tool with less vibration than a non-balanced bevel disk. In addition, the bevel disk contains a "D" profile to key rotation of the gearbox. A set screw or other geometry may be used.

    [0031] The wobble plate features five spring pockets and one pump pocket with equal spacing. It should be noted that there could be two spring pockets and one pump pocket equally spaced or other variation thereof. The pump spring applies force to the pump which, in turn, transmits force to the wobble plate. This force is of similar magnitude as the wobble plate springs. In addition, the interlocking or contact of the wobble plate springs and pump, restrict the wobble plate from rotating. However, the wobble plate is free to pivot about the 5/16 diameter ball. It should be noted that the ball could be of different diameter. As the wobble plate pivots it creates linear movement of the pump. It should also be noted that the pump is offset from the centerline of the gearbox by approximately 0.4 inches. The centerline of the wobble plate intersects the centerline of the gearbox on an angle.

    [0032] To prevent wobble plate rotation there is yet another design variation. The outer diameter of the wobble plate could contain one or more grooves with an interlocking screw key. The screw key could be used to guide the wobble plate while it pivots about the 5/16 diameter ball. This would prevent rotation of the wobble" plate. The screw key could be assembled radially through the transmission case in close proximity to the wobble plate. It should also be noted that this design portrays a single piston pump. There could be two pistons or more .

    [0033] It should be understood that the foregoing description is only illustrative of the invention. Various alternatives and modifications can be devised by those skilled in the art without departing from the invention. Accordingly, the invention is intended to embrace all such alternatives, modifications and variances which fall within the scope of the appended claims .


    Claims

    1. A hydraulic tool comprising:

    a motor (14);

    a hydraulic pump (12) comprising only one reciprocating piston pump member (48); and

    a transmission (16) connecting the motor (14) to the hydraulic pump (12), wherein the transmission (16) comprises a wobble plate (60) and at least one first spring (58) comprising a first end and an opposite second end, wherein the wobble plate (60) comprises a front end pivotably connected to a frame (36) of the pump (12), wherein the piston pump member (48) is located in a piston channel (42) of the frame (36) of the pump (12), wherein a rear end of the piston pump member (48) is located against the front end of the wobble plate (60), wherein the first end of the first spring (58) is located in a pocket (54) of the frame (36) of the pump (12), wherein the second end of the first spring (58) contacts the wobble plate (60), wherein the first spring (58) is spaced from the piston pump member (48) and applies a biasing force against the front end (94) of the wobble plate (60),

    wherein the piston pump member (48) extends out of the rear end of the frame (36) and is biased outwards by a second spring (50),

    wherein the first and second springs (50,58) balance out each others' biasing force,

    wherein the wobble plate (60) has a front face with a pump pocket (104) and a spring pocket (106), whereby the engagement of the second end of the first spring (58) and the piston pump member (48) respectively in the spring pocket (106) and the pump pocket (104), in addition to their primary functions, also perform a secondary function of forming a system for preventing the wobble plate (60) from axially rotating.


     
    2. A hydraulic tool as in claim 1 wherein the front end of the wobble plate (60) comprises a pump pocket (104) and at least two spring pockets (106).
     
    3. A hydraulic tool as in claim 2 wherein the at least one spring (58) comprises at least two springs located in respective ones of the spring pockets (106).
     
    4. A hydraulic tool as in claim 2 wherein the front end of the wobble plate (60) further comprises a ball pocket (102), and the transmission (16) further comprises a ball (56) located in the ball pocket (102) and pivotably supporting the wobble plate (60) on the frame (36) of the pump (12).
     
    5. A hydraulic tool as in claim 1 wherein the front end of the wobble plate (60) comprises a pump pocket (104) and at least five spring pockets (106).
     
    6. A hydraulic tool as in claim 1 wherein the transmission (16) further comprises a bevel disk (64) located at a rear end of the wobble plate (60), wherein the bevel disk (64) has an angled front face and is adapted to rotate relative to the wobble plate (60).
     
    7. A hydraulic tool as in claim 6 wherein the bevel disk (64) comprises at least one counter balance pocket (82) which substantially balances weight of the bevel disk (64) about a center axis of rotation (84) of the bevel disk (64).
     
    8. A hydraulic tool as in claim 7 wherein the at least one counter balance pocket (82) comprises a pocket extending into the front face of the bevel disk (64).
     
    9. A hydraulic tool as in claim 6 wherein the bevel disk (64) comprises a center shaft channel (74) having a keying shape.
     
    10. A hydraulic tool as in claim 6 further comprising a radial bearing (86) between an outermost radial end of the bevel disk (64) and a frame of the tool (62).
     
    11. A hydraulic tool as in claim 10 further comprising an axial bearing (86) supporting the bevel disk (64) on the frame of the tool (62).
     
    12. A hydraulic tool as in claim 1 wherein the wobble plate (60) is prevented from axially rotating by an additional rotation preventing system comprising a key member (112) connected to the wobble plate (60) and interlocking the wobble plate (60) with a frame of the tool (62) to prevent axial rotation of the wobble plate (60) relative to the frame (62).
     


    Ansprüche

    1. Hydraulisches Werkzeug, umfassend:

    einen Motor (14);

    eine hydraulische Pumpe (12), die nur ein einziges Hubkolbenpumpenelement (48) umfasst; und

    eine Übertragungsvorrichtung (16), die den Motor (14) mit der hydraulischen Pumpe (12) verbindet, wobei die

    Übertragungsvorrichtung (16) eine Taumelplatte (60) und mindestens eine erste Feder (58), die ein erstes Ende und ein gegenüberliegendes zweites Ende umfasst, umfasst, wobei die Taumelplatte (60) ein vorderes Ende umfasst, das mit einem Rahmen (36) der Pumpe (12) drehbar verbunden ist, wobei das Kolbenpumpenelement (48) in einem Kolbenkanal (42) des Rahmens (36) der Pumpe (12) angeordnet ist,

    wobei ein hinteres Ende des Kolbenpumpenelements (48) gegen das vordere Ende der Taumelplatte (60) angeordnet ist, wobei das erste Ende der ersten Feder (58) in einer Tasche (54) des Rahmens (36) der Pumpe (12) angeordnet ist, wobei das zweite Ende der ersten Feder (58) mit der Taumelplatte (60) in Kontakt tritt,

    wobei die erste Feder (58) zu dem Kolbenpumpenelement (48) beabstandet ist und eine Vorspannungskraft gegen das vordere Ende (94) der Taumelplatte (60) anlegt,

    wobei sich das Kolbenpumpenelement (48) aus dem hinteren Ende des Rahmens (36) heraus erstreckt und durch eine zweite Feder (50) nach außen vorgespannt ist,

    wobei die erste und zweite Feder (50, 58) sich in ihrer Vorspannungskraft gegenseitig ausgleichen,

    wobei die Taumelplatte (60) eine vordere Seite mit einer Pumpentasche (104) und eine Federtasche (106) aufweist, wodurch die Eingriffe von dem zweiten Ende der ersten Feder (58) in die Federtasche (106) und von dem Kolbenpumpenelement (48) in die Pumpentasche (104), zusätzlich zu ihren primären Funktionen, auch eine sekundäre Funktion ausüben, indem sie ein System bilden, das verhindert, dass die Taumelplatte (60) axial rotiert.


     
    2. Hydraulisches Werkzeug nach Anspruch 1, wobei das vordere Ende der Taumelplatte (60) eine Pumpentasche (104) und mindestens zwei Federtaschen (106) umfasst.
     
    3. Hydraulisches Werkzeug nach Anspruch 2, wobei die mindestens eine Feder (58) mindestens zwei Federn umfasst, die in den jeweiligen Federtaschen (106) angeordnet sind.
     
    4. Hydraulisches Werkzeug nach Anspruch 2, wobei das vordere Ende der Taumelplatte (60) ferner eine Kugeltasche (102) umfasst und die Übertragungsvorrichtung (16) ferner eine Kugel (56) umfasst, die in der Kugeltasche (102) angeordnet ist und die Taumelplatte (60) auf dem Rahmen (36) der Pumpe (12) drehbar stützt.
     
    5. Hydraulisches Werkzeug nach Anspruch 1, wobei das vordere Ende der Taumelplatte (60) eine Pumpentasche (104) und mindestens fünf Federtaschen (106) umfasst.
     
    6. Hydraulisches Werkzeug nach Anspruch 1, wobei die Übertragungsvorrichtung (16) ferner eine Schrägscheibe (64) umfasst, die an dem hinteren Ende der Taumelplatte (60) angeordnet ist, wobei die Schrägscheibe (64) eine angewinkelten vordere Seite aufweist und geeignet ist, um in Bezug auf die Taumelplatte (60) zu rotieren.
     
    7. Hydraulisches Werkzeug nach Anspruch 6, wobei die Schrägscheibe (64) mindestens eine Gegenausgleichstasche (82) umfasst, die im Wesentlichen das Gewicht der Schrägscheibe (64) um eine zentrale Rotationsachse (84) der Schrägscheibe (64) herum ausgleicht.
     
    8. Hydraulisches Werkzeug nach Anspruch 7, wobei die mindestens eine Gegenausgleichstasche (82) eine Tasche umfasst, die sich in die vordere Seite der Schrägscheibe (64) erstreckt.
     
    9. Hydraulisches Werkzeug nach Anspruch 6, wobei die Schrägscheibe (64) einen zentralen Schaftkanal (74) umfasst, der eine sich verkeilende Form aufweist.
     
    10. Hydraulisches Werkzeug nach Anspruch 6, ferner umfassend zwischen einem äußersten radialen Ende der Schrägscheibe (64) und einem Rahmen des Werkzeugs (62) ein Radiallager (86).
     
    11. Hydraulisches Werkzeug nach Anspruch 10, ferner umfassend ein Axiallager (86), das die Schrägscheibe (64) auf dem Rahmen des Werkzeugs (62) stützt.
     
    12. Hydraulisches Werkzeug nach Anspruch 1, wobei die Taumelplatte (60) durch ein zusätzliches Rotationsverhinderungssystem daran gehindert wird, axial zu rotieren, das ein Verkeilungselement (112) umfasst, das mit der Taumelplatte (60) verbunden ist, und die Taumelplatte (60) mit einem Rahmen des Werkzeugs (62) ineinandergreifen lässt, um eine axiale Rotation der Taumelplatte (60) in Bezug auf den Rahmen (62) zu verhindern.
     


    Revendications

    1. Outil hydraulique, comprenant:

    un moteur (14);

    une pompe hydraulique (12) comprenant un seul élément de pompe à piston alternatif (48); et

    une transmission (16) qui connecte le moteur (14) à la pompe hydraulique (12), dans lequel la transmission (16) comprend un plateau oscillant (60) et au moins un premier ressort (58) présentant une première extrémité et une seconde extrémité opposée, dans lequel le plateau oscillant (60) présente une extrémité avant connectée de façon pivotante à un cadre (36) de la pompe (12), dans lequel l'élément de pompe à piston (48) est situé dans un canal de piston (42) du cadre (36) de la pompe (12), dans lequel une extrémité arrière de l'élément de pompe à piston (48) est située contre l'extrémité avant du plateau oscillant (60), dans lequel la première extrémité du premier ressort (58) est située dans une poche (54) du cadre (36) de la pompe (12), dans lequel la seconde extrémité du premier ressort (58) est en contact avec le plateau oscillant (60),

    dans lequel le premier ressort (58) est espacé de l'élément de pompe à piston (48) et applique une force de poussée contre l'extrémité avant (94) du plateau oscillant (60),

    dans lequel l'élément de pompe à piston (48) s'étend hors de l'extrémité arrière du cadre (36) et est poussé vers l'extérieur par un second ressort (50),

    dans lequel les premier et second ressorts (50, 58) équilibrent chacun la force de poussée de l'autre,

    dans lequel le plateau oscillant (60) présente une face avant avec une poche de pompe (104) et une poche de ressort (106), dans lequel l'engagement de la seconde extrémité du premier ressort (58) et de l'élément de pompe à piston (48) respectivement dans la poche de ressort (106) et dans la poche de pompe (104), en plus de leurs fonctions primaires, exécute également une fonction secondaire qui consiste à former un système pour empêcher le plateau oscillant (60) de tourner axialement.


     
    2. Outil hydraulique selon la revendication 1, dans lequel l'extrémité avant du plateau oscillant (60) comprend une poche de pompe (104) et au moins deux poches de ressort (106).
     
    3. Outil hydraulique selon la revendication 2, dans lequel ledit au moins un ressort (58) comprend au moins deux ressorts situés respectivement dans une des poches de ressort (106).
     
    4. Outil hydraulique selon la revendication 2, dans lequel l'extrémité avant du plateau oscillant (60) comprend en outre une poche à bille (102), et la transmission (16) comprend en outre une bille (56) située dans la poche à bille (102) et supportant de façon pivotante le plateau oscillant (60) sur le cadre (36) de la pompe (12).
     
    5. Outil hydraulique selon la revendication 1, dans lequel l'extrémité avant du plateau oscillant (60) comprend une poche de pompe (104) et au moins cinq poches de ressort (106).
     
    6. Outil hydraulique selon la revendication 1, dans lequel la transmission (16) comprend en outre un disque biseauté (64) situé à une extrémité arrière du plateau oscillant (60), dans lequel le disque biseauté (64) présente une face avant oblique et est adapté pour tourner par rapport au plateau oscillant (60).
     
    7. Outil hydraulique selon la revendication 6, dans lequel le disque biseauté (64) comprend au moins une poche d'équilibrage (82) qui équilibre sensiblement le poids du disque biseauté (64) autour d'un axe de rotation central (84) du disque biseauté (64).
     
    8. Outil hydraulique selon la revendication 7, dans lequel ladite au moins une poche d'équilibrage (82) comprend une poche qui s'étend dans la face avant du disque biseauté (64).
     
    9. Outil hydraulique selon la revendication 6, dans lequel le disque biseauté (64) comprend un canal d'arbre central (74) en forme de canal de clavette.
     
    10. Outil hydraulique selon la revendication 6, comprenant en outre un palier radial (86) entre une extrémité radiale la plus extérieure du disque biseauté (64) et un cadre de l'outil (62).
     
    11. Outil hydraulique selon la revendication 10, comprenant en outre un palier axial (86) qui supporte le disque biseauté (64) sur le cadre de l'outil (62).
     
    12. Outil hydraulique selon la revendication 1, dans lequel le plateau oscillant (60) est empêché de tourner axialement par un système de prévention de rotation supplémentaire comprenant un élément de clavette (112) connecté au plateau oscillant (60) et qui inter-verrouille le plateau oscillant (60) avec un cadre de l'outil (62) dans le but d'empêcher toute rotation axiale du plateau oscillant (60) par rapport au cadre (62).
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description