(19)
(11)EP 3 339 678 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
18.03.2020 Bulletin 2020/12

(21)Application number: 16839043.3

(22)Date of filing:  03.08.2016
(51)Int. Cl.: 
F16F 13/20  (2006.01)
F16F 13/26  (2006.01)
F16F 13/10  (2006.01)
(86)International application number:
PCT/JP2016/072862
(87)International publication number:
WO 2017/033696 (02.03.2017 Gazette  2017/09)

(54)

VIBRATION-PROOFING DEVICE

VIBRATIONSFESTE VORRICHTUNG

DISPOSITIF ANTIVIBRATION


(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: 21.08.2015 JP 2015164133
07.07.2016 JP 2016135249

(43)Date of publication of application:
27.06.2018 Bulletin 2018/26

(73)Proprietor: Bridgestone Corporation
Tokyo 104-8340 (JP)

(72)Inventor:
  • KOJIMA, Hiroshi
    Tokyo 104-8340 (JP)

(74)Representative: Oxley, Robin John George 
Marks & Clerk LLP 15 Fetter Lane
London EC4A 1BW
London EC4A 1BW (GB)


(56)References cited: : 
JP-A- H0 571 573
JP-A- 2002 357 239
JP-A- 2004 301 248
JP-A- 2010 255 819
US-A1- 2003 098 533
JP-A- H08 277 877
JP-A- 2003 148 550
JP-A- 2005 076 797
US-A- 5 217 211
  
      
    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 disclosure relates to an anti-vibration device that suppresses vibration.

    Related Art



    [0002] In vehicles, anti-vibration devices are employed to suppress vibration generated by the engine (see, for example, Japanese Patent Application Laid-Open (JP-A) No. H08-74923).

    [0003] This anti-vibration device includes a support body that supports the engine, a cylinder body that is coupled to the vehicle body, and an elastic body that couples the support body to the cylinder body. A liquid chamber is formed inside the cylinder body. The liquid chamber is sectioned by a second partitioning wall into a main liquid chamber and a sub liquid chamber, in this sequence from the support body side.

    [0004] The main liquid chamber and the sub liquid chamber are in communication with each other through a regulating pathway formed in the second partitioning wall. Part of a wall face of the sub liquid chamber is configured by a diaphragm. An air chamber is provided on the other side of the diaphragm to the sub liquid chamber. The air chamber is configured to be capable of being placed in communication with the exterior by a switching valve. The air chamber is capable of switching between a state in communication with the exterior and open to the atmosphere, and a non-open state sealed off from the exterior.

    [0005] Accordingly, when the elastic body deforms due to vibration from the engine, the diaphragm configuring the wall face of the sub liquid chamber deforms, such that there is an exchange flow of liquid between the main liquid chamber and the sub liquid chamber via the regulating pathway. The static spring constant of the anti-vibration device can be changed by switching the atmosphere-open-state of the air chamber using the switching valve. Attention is also drawn to the disclosures of US5,217,211 and JPH08-277877. US5,217,211 discloses the preamble of independent Claim 1 and Claim 3.

    SUMMARY OF INVENTION


    Technical Problem



    [0006] However, since the switching valve has hitherto been configured in communication with the exterior of the anti-vibration device, it has been necessary to provide a filter at a portion in communication with the exterior in order to prevent the intrusion of foreign objects or moisture into the switching valve.

    [0007] An object of an exemplary embodiment of the present invention is to provide an anti-vibration device in which foreign objects or moisture do not readily intrude into a switching section.

    Solution to Problem



    [0008] A first aspect of the present invention provides an anti-vibration device as claimed in claim 1.

    [0009] Namely, the switching section is configured to place the first gas chamber and the second gas chamber in communication with each other. The intrusion of foreign objects or moisture from the exterior is thereby suppressed, without providing a filter or the like at a portion of the switching section in communication with the exterior, as in a structure in which the first gas chamber is placed in direct communication with the exterior.

    [0010] In the first aspect, the second gas chamber is only communicable with the first gas chamber.

    [0011] Namely, the second gas chamber, that communicates with the first gas chamber, is configured to be only communicable with the first gas chamber, thus enabling a closely sealed state of the first gas chamber and the second gas chamber to be maintained even in a state in which the first gas chamber and the second gas chamber are in communication with each other.

    [0012] This thereby enables the intrusion of foreign objects or moisture into the switching section from the exterior to be suppressed in comparison to cases in which the second gas chamber is open to the atmosphere through small holes.

    [0013] In a second aspect, a capacity of the second gas chamber is greater than a capacity of the first gas chamber.

    [0014] Namely, by setting the capacity of the second gas chamber to be greater than that of the first gas chamber, a large change in capacity can be achieved between a state of non-communication between the two gas chambers and a state of communication between the two gas chambers.

    [0015] Thus increasing the difference between the respective capacities of the gas chambers enables a large change in the static spring constant of the anti-vibration device to be achieved, even within a limited space.

    [0016] A third aspect of the present invention provides an anti-vibration device as claimed in claim 3.

    [0017] Namely, the switching section is configured to place the first gas chamber and the second gas chamber in communication with each other. The intrusion of foreign objects or moisture from the exterior is thereby suppressed, without providing a filter or the like at a portion of the switching section in communication with the exterior, as in a structure in which the first gas chamber is placed in direct communication with the exterior.

    [0018] In a fourth aspect, the first gas chamber is in communication with the second gas chamber through the deformation space, and the switching section switches a state of communication between the first gas chamber and the second gas chamber through the deformation space.

    [0019] This thereby enables efficient utilization of the deformation space of the second membrane.

    [0020] In a fifth aspect, a capacity of the second gas chamber is greater than a capacity of the deformation space, and the capacity of the deformation space is greater than a capacity of the first gas chamber.

    [0021] Namely, by setting the capacity of the second gas chamber to be greater than that of the first gas chamber, the capacity can be changed largely between a state of non-communication between the two gas chambers and a state of communication between the two gas chambers.

    [0022] Thus increasing the difference between the respective capacities enables the static spring constant of the anti-vibration device to be changed largely, even within a limited space.

    [0023] Moreover, the capacity of the first gas chamber is smaller than the capacities of the deformation space and of the second gas chamber. This thereby enables deformation of the first membrane to be suppressed when in the state of non-communication.

    Advantageous Effects of Invention



    [0024] The aspects configured as described above achieve an anti-vibration device in which foreign objects or moisture do not readily intrude into a switching section.

    BRIEF DESCRIPTION OF DRAWINGS



    [0025] 

    Fig. 1 is a longitudinal cross-section illustrating an anti-vibration device according to a first exemplary embodiment.

    Fig. 2 is cross-section illustrating an anti-vibration device according to the first exemplary embodiment, as viewed along the arrows 2-2 in Fig. 1.

    Fig. 3 is a longitudinal cross-section illustrating an anti-vibration device according to a second exemplary embodiment.

    Fig. 4 is a longitudinal cross-section illustrating an anti-vibration device according to a third exemplary embodiment.


    DESCRIPTION OF EMBODIMENTS


    First Exemplary Embodiment



    [0026] Explanation follows regarding a first exemplary embodiment of the present invention, with reference to the drawings.

    [0027] Fig. 1 is a diagram illustrating an anti-vibration device 10 according to the present exemplary embodiment. The anti-vibration device 10 is attached to a vehicle, and is used to suppress vibration from an engine.

    [0028] The anti-vibration device 10 includes a cylinder body 12 that is coupled to a vehicle body, serving as an example of a vibration receiver. An opening edge of an opening at an end portion on one direction A side of the cylinder body 12 is curved toward a radial direction outer side, forming a curved portion 12A around the entire periphery of the cylinder body 12.

    [0029] An elastic body 14 made from rubber is bonded to the curved portion 12A of the cylinder body 12. The opening on the one direction A side of the cylinder body 12 is closed off by the elastic body 14.

    [0030] The elastic body 14 includes a main body 14A that is formed in a circular column shape. A sideways-extending flange 14B is integrally formed around the entire circumference of the main body 14A at one end portion of the main body 14A. A leg section 12C is integrally formed to the main body 14A so as to extend toward the curved portion 12A of the cylinder body 12. An end face of the leg section 12C is vulcanization-bonded to an inner peripheral face of the curved portion 12A of the cylinder body 12.

    [0031] The leg section 12C is inclined toward an outer peripheral direction on progression toward a cylinder body 12 side. The elastic body 14 is formed with a peaked shape that becomes higher on progression toward a central portion. An inner face 12D of the leg section 12C is inclined so as to become higher on progression toward the central portion, forming an inverted conical bowl-shaped space inside the elastic body 14.

    [0032] A metal support body 16 is provided at the main body 14A of the elastic body 14. The support body 16 is provided with an embedded portion 16A that is embedded in the main body 14A, and an extension section 16B extending out from the embedded portion 16A. The extension section 16B is configured so as to extend beyond an end face of the main body 14A. The embedded portion 16A is configured by a circular plate shaped anchor 16C, and a triangular pyramidal projection 16D projecting from the anchor 16C toward the cylinder body 12 side. The anchor 16C suppresses the support body 16 from being pulled out from the elastic body 14.

    [0033] The extension section 16B is configured by a circular column shaped large diameter portion 16E extending from the anchor 16C, and a threaded portion 16F extending from the large diameter portion 16E. The threaded portion 16F is configured to support an engine, this being an example of a vibration source. The elastic body 14 elastically deforms when input with vibration from the engine, so as to allow the support body 16 to move relative to the cylinder body 12.

    [0034] A partitioning member 18 is provided inside the cylinder body 12. A first liquid chamber 20, filled with a liquid such as ethylene glycol, is formed between the partitioning member 18 and the elastic body 14. A second liquid chamber 22 is formed on the opposite side of the partitioning member 18 from the first liquid chamber 20.

    [0035] The partitioning member 18 includes a circular plate 24, formed from a circular plate material, and a support plate 26 that supports the circular plate 24. The support plate 26 is fixed in a state in which an upper face of a circular top face 26A configuring a central portion of the support plate 26 is in face-to-face contact with the circular plate 24, while a lower face of the top face 26A faces the second liquid chamber 22. An outer peripheral portion of the top face 26A is bent toward another direction B side to form a small diameter cylinder wall 26B. An end portion of the small diameter cylinder wall 26B is bent outward to form a step 26C. An outer peripheral portion of the step 26C is bent toward the other direction B side to form a large diameter cylinder wall 26D. An end portion of the large diameter cylinder wall 26D is bent outward, and a fixing flange 26E is formed around the entire circumference of the large diameter cylinder wall 26D.

    [0036] A circular ring-shaped pathway formation member 28 is provided at the step 26C. The pathway formation member 28 is retained on the partitioning member 18 in a state held between the step 26C of the support plate 26, and the circular plate 24. An outer peripheral face of the pathway formation member 28 is formed with a helical groove, and an orifice pathway 30 is configured between the groove and the cylinder body 12. One end of the orifice pathway 30 is in communication with the first liquid chamber 20 through a hole, not illustrated in the drawings, provided in the circular plate 24, and the other end of the orifice pathway 30 is in communication with the second liquid chamber 22 through a hole, not illustrated in the drawings, provided in the step 26C.

    [0037] The first liquid chamber 20 and the second liquid chamber 22 are placed in communication with each other by the orifice pathway 30. The orifice pathway 30 is configured to enable an exchange flow of liquid between the first liquid chamber 20 and the second liquid chamber 22, and to limit the flow rate.

    [0038] An insertion-fitting member 32 is fixed to the large diameter cylinder wall 26D of the support plate 26. The insertion-fitting member 32 is configured by an inner fitting cylinder 32A that fits into the large diameter cylinder wall 26D, and a flange 32B bent outward from an end of the inner fitting cylinder 32A. At a circumferential rim of the flange 32B there is an inflected portion 32C formed around the entire circumference so as to be inflected toward the other direction B side.

    [0039] A circumferential rim of a diaphragm 34 made from rubber is vulcanization-bonded to an inside of the inner fitting cylinder 32A. The second liquid chamber 22 is thus sectioned by the diaphragm 34 and the top face 26A side of the support plate 26.

    [0040] A bottom-section configuration member 36 is provided further to the other direction B side than the diaphragm 34. The bottom-section configuration member 36 forms a wall face 36D that closes off an opening on the other direction B side of the cylinder body 12, thereby sealing the internal space of the cylinder body 12.

    [0041] The bottom-section configuration member 36 is configured by a circular column 36A, and a fixing portion 36B projecting outward from a circumferential face of the circular column 36A. The fixing portion 36B is surrounded by the inflected portion 32C in a state in which the fixing portion 36B is in face-to-face contact with the flange 32B of the insertion-fitting member 32. The fixing portion 36B of the bottom-section configuration member 36, the flange 32B of the insertion-fitting member 32, and the fixing flange 26E of the support plate 26 are fixed by crimping an edge of the cylinder body 12 at a crimped portion 38.

    [0042] An upper end face of the bottom-section configuration member 36 configures a dividing wall 36C sectioning the internal space of the cylinder body 12. An air-filled first gas chamber 40 is thus formed between the dividing wall 36C and the diaphragm 34. The first gas chamber 40 is disposed on the opposite side of a wall configured by the diaphragm 34 from the second liquid chamber 22.

    [0043] A circular column shaped first communication pathway 42 that is in communication with the first gas chamber 40 is opened in the dividing wall 36C configured by the bottom-section configuration member 36. A first port 44A of a switching section 44 built into the bottom-section configuration member 36 is connected to the first communication pathway 42. A second port 44B on the opposite side of the switching section 44 from the first port 44A is in communication with a second gas chamber 46 formed in the bottom-section configuration member 36.

    [0044] As illustrated in Fig. 2, a thin walled portion 36E configures an outer peripheral wall at the bottom-section configuration member 36, and the second gas chamber 46 is configured by a large cavity provided at an inside of the thin walled portion 36E. The switching section 44 is provided at a jutting out portion 36F formed such that the jutting out portion 36F juts out from a portion of the thin walled portion 36E toward the inside. The second gas chamber 46 is formed substantially in a fan-shape circumventing the jutting out portion 36F provided with the switching section 44. A region of the bottom-section configuration member 36 excluding the jutting out portion 36F is efficiently utilized as the second gas chamber 46. Thus approximately one third of the interior of the bottom-section configuration member 36 is set to configure the jutting out portion 36F, and approximately two thirds of the interior of the bottom-section configuration member 36 is set to configure the second gas chamber 46.

    [0045] A skeleton wall 36G is provided extending outward through a central portion of the fan shape of the second gas chamber 46. The skeleton wall 36G is disposed at a position bisecting the second gas chamber 46. The skeleton wall 36G supports a top face of the second gas chamber 46 on a bottom face of the second gas chamber 46, and maintains a separation distance between the top face and the bottom face, thereby providing structural reinforcement to the second gas chamber 46.

    [0046] A gap is provided between a leading end of the skeleton wall 36G and the thin walled portion 36E, so as to form a pathway 36H. A region provided with the second port 44B of the switching section 44 is formed on one side and another region is formed on the other side of the skeleton wall 36G as a boundary, and the both regions are in communication with each other through the pathway 36H. This provides structural reinforcement to the second gas chamber 46 while securing the overall capacity of the second gas chamber 46. A path from the one side to the other side of the second gas chamber 46 is configured so as to be inflected.

    [0047] A height dimension of the second gas chamber 46 is set larger than that of the first gas chamber 40. The capacity of the second gas chamber 46 is therefore greater than the capacity of the first gas chamber 40.

    [0048] Note that although in the present exemplary embodiment explanation is given regarding a case in which the capacity of the second gas chamber 46 is greater than the capacity of the first gas chamber 40, there is no limitation thereto. The capacity of the second gas chamber 46 and the capacity of the first gas chamber 40 may be the same as each other, or the capacity of the second gas chamber 46 may be smaller than the capacity of the first gas chamber 40.

    [0049] As illustrated in Fig. 1, the second gas chamber 46 is provided at a position separated from the diaphragm 34 by the dividing wall 36C configured by the bottom-section configuration member 36. The diaphragm 34 does not configure a wall of the second gas chamber 46. Accordingly, even when the pressure inside the second liquid chamber 22 changes so as to displace the diaphragm 34, the second gas chamber 46 does not influence the pressure change inside the second liquid chamber 22 so long as the second gas chamber 46 and the first gas chamber 40 are in a state of non-communication.

    [0050] In this example, the switching section 44 is configured by a solenoid valve. Only a terminal of the solenoid valve that is connected to a control harness extends to the exterior (not illustrated in the drawings). The solenoid valve configuring the switching section 44 is thus kept airtight and watertight, thereby preventing the intrusion of water or foreign objects from the exterior.

    [0051] The solenoid valve configuring the switching section 44 controls an air flow between the first port 44A and the second port 44B. Specifically, when the solenoid valve is operated, an air flow between the first port 44A and the second port 44B is permitted, thereby forming a state of communication in which the first gas chamber 40 and the second gas chamber 46 are in communication with each other. When the solenoid valve is not operated, the air flow between the first port 44A and the second port 44B is cut off, forming a state of non-communication in which the first gas chamber 40 and the second gas chamber 46 are not in communication with each other.

    [0052] The switching section 44 is thus configured capable of placing the first port 44A and the second port 44B in communication with each other, and the switching section 44 is capable of placing the first gas chamber 40, which is in communication with the first port 44A through the first communication pathway 42, in communication with the second gas chamber 46, which is in communication with the second port 44B.

    [0053] The switching section 44 is provided with a housing space that houses the workings of the solenoid valve, such as a solenoid, a plunger, and a valve body (not illustrated in the drawings). Taking the first gas chamber 40 as being on an upstream side, the switching section 44 is connected to the second gas chamber 46 downstream of the housing space such that the switching section 44 is capable of placing the first gas chamber 40, which is on the upstream side of the housing space, in communication with the second gas chamber 46, which is on the downstream side of the housing space.

    [0054] The second gas chamber 46 is configured to be only communicable with the first gas chamber 40, and is sealed elsewhere to prevent any communication except that with the first gas chamber 40.

    [0055] Explanation follows regarding operation of the present exemplary embodiment configured as described above. When vibration is received from the engine and relative movement occurs between cylinder body 12 and the support body 16, the elastic body 14 deforms, changing the liquid pressure inside the first liquid chamber 20. When this occurs, liquid moves between the first liquid chamber 20 and the second liquid chamber 22 via the orifice pathway 30, thereby changing the liquid pressure in the second liquid chamber 22, and displacing the diaphragm 34 in accordance with this change in the liquid pressure.

    [0056] When this occurs, the displacement amount of the diaphragm 34 varies according to spring force of an air spring in the first gas chamber 40.

    [0057] Accordingly, the state of non-communication, in which the first gas chamber 40 and the second gas chamber 46 are not in communication with each other, is changed by the switching section 44 to the state of communication. This increases the total capacity of gas chamber having a wall face configured by the diaphragm 34. This enables the static spring constant of the anti-vibration device 10 to be changed from a high spring constant to a low spring constant.

    [0058] When this occurs, the switching section 44 communicates with the second gas chamber 46. This enables the intrusion of foreign objects or moisture from the exterior to be suppressed, without providing a filter or the like at a portion of the switching section 44 establishing communication with the exterior, as would be the case were the first gas chamber 40 to be placed in direct communication with the exterior. This thereby enables rusting or shorting caused by moisture intrusion to be suppressed.

    [0059] Moreover, the switching section 44 is built into the bottom-section configuration member 36 so as to be kept airtight and watertight. This thereby enables the direct intrusion of foreign objects or moisture into the switching section 44 to be suppressed in comparison to cases in which the switching section 44 is provided at the exterior of the anti-vibration device 10. This enables the aforementioned advantageous effect to be enhanced.

    [0060] The second gas chamber 46 is only communicable with the first gas chamber 40, and is sealed so as to prevent any other communication other than that with the first gas chamber 40.

    [0061] Moreover, the second gas chamber 46 is sealed so as to prevent any communication other than that with the first gas chamber 40, thus enabling a closely sealed state to be maintained even in a state in which the first gas chamber 40 and the second gas chamber 46 are in communication with each other. This thereby enables the intrusion of foreign objects or moisture into the switching section 44 from the exterior to be suppressed in comparison to cases in which the first gas chamber 40 is in communication with the exterior, without providing a filter or the like at a communication portion.

    [0062] Moreover, the intrusion of foreign objects or moisture from the exterior can be suppressed in comparison to cases in which the second gas chamber 46 is configured open to the atmosphere by the provision of small holes.

    [0063] The anti-vibration device 10 is thereby achieved in which foreign objects or moisture do not readily intrude into the switching section 44 in.

    [0064] The capacity of the second gas chamber 46 is set to be greater than the capacity of the first gas chamber 40, enabling a larger change in capacity between the state of non-communication between the first gas chamber 40 and the second gas chamber 46, and the state of communication.

    [0065] Accordingly, even with the limited space available inside the device, a large change in the static spring constant of the anti-vibration device 10 can be achieved by making a large difference between the capacity occupied by the first gas chamber 40 and the capacity occupied by the second gas chamber 46.

    [0066] Note that although in the present exemplary embodiment, explanation has been given regarding an example in which the second gas chamber 46 is only communicable with the first gas chamber 40, there is no limitation thereto. For example, small holes that place the second gas chamber 46 in communication with the exterior may be formed penetrating a bottom face of the circular column 36A. So long as such small holes are holes capable of preventing the intrusion of solid foreign objects, blockages can be prevented. Accordingly, placing the switching section 44 in the state of communication allows the first gas chamber 40 to approach a state open to the atmosphere, enabling an even greater change in the static spring constant of the anti-vibration device 10 to be achieved.

    [0067] In such cases, the intrusion of foreign objects or moisture into the switching section 44 can be suppressed by providing small holes at a location separated from the second port 44B. Here, in the present exemplary embodiment, the skeleton wall 36G is provided in the second gas chamber 46, and the path from the one side to the other side of the second gas chamber 46 is configured so as to be inflected. This thereby enables the advantageous effect of enhancing the prevention of foreign objects or moisture intruding. Moreover, provision of a filter to any small holes provided would enable the intrusion of foreign objects or moisture to be suppressed.

    [0068] Moreover, although in the present exemplary embodiment, explanation has been given regarding a case in which a wall face of the second gas chamber 46 is configured by the bottom-section configuration member 36, there is no limitation thereto. For example, configuring part of the wall face of the second gas chamber 46 with a diaphragm facing the exterior enables the first gas chamber 40 to more closely approach a state open to the atmosphere when the switching section 44 has set the state of communication. Moreover, the second gas chamber 46 may be provided away from the anti-vibration device 10 so long as the state of communication with the first gas chamber 40 can be achieved.

    Second Exemplary Embodiment



    [0069] Fig. 3 is a diagram illustrating an anti-vibration device 100 according to a second exemplary embodiment. Portions that are the same as or equivalent to those of the first exemplary embodiment are allocated the same reference numerals, and explanation thereof is omitted. Explanation covers only portions that differ from the first exemplary embodiment.

    [0070] Namely, a partitioning plate 102 is provided inside the cylinder body 12 on the elastic body 14 side. A central hole 104 is provided at a central portion of the partitioning plate 102. The central hole 104 is provided with a circular plate shaped first membrane 106 made from rubber. A circumferential edge of the first membrane 106 is vulcanization-bonded to an opening edge of the central hole 104. The interior of the cylinder body 12 is thereby partitioned by the first membrane 106.

    [0071] The cylinder body 12 is provided with the pathway formation member 28, serving as an example of a pathway member that in face-to-face contacts with the partitioning plate 102. A recess is formed in one face 28A of the pathway formation member 28 at a location corresponding to the first membrane 106, and a first gas chamber 108 is formed between a first partitioning wall 28B formed on the bottom face of the recess and the first membrane 106.

    [0072] A recess 28D is formed in another face 28C of the pathway formation member 28. A circular plate shaped second membrane 112 made from rubber and supported by a ring member 110 is provided at a bottom side, i.e. the elastic body 14 side, of the recess 28D. The interior of the cylinder body 12 is partitioned by the second membrane 112. A wall face at further toward the bottom side of the recess 28D than the fixing position of the second membrane 112 is set back at locations corresponding to the second membrane 112. A second liquid chamber 114 is formed between the second membrane 112 and the first partitioning wall 28B. The second liquid chamber 114 is in communication with the first liquid chamber 20 through the orifice pathway 30, this being an example of a pathway formed in the pathway formation member 28, in a configuration such that there is a flow of liquid between the first liquid chamber 20 and the second liquid chamber 114.

    [0073] The orifice pathway 30 is configured by a pathway opening 30A formed at the partitioning plate 102, a groove 30B formed in a helical shape around a circumferential face of the pathway formation member 28, and a communication hole (not illustrated in the drawings) placing the groove 30B in communication with the second liquid chamber 114.

    [0074] A thick walled portion 36J formed at a central portion of the bottom-section configuration member 36 is fitted into the recess 28D of the pathway formation member 28. A recess is formed at an end face of the thick walled portion 36J at locations corresponding to the second membrane 112. A deformation space 116 forming a deformable region of the second membrane 112 is formed between a second partitioning wall 361 at the bottom of the recess and the second membrane 112.

    [0075] The bottom-section configuration member 36 is provided with the second gas chamber 46 and the switching section 44 described above. The first port 44A of the switching section 44 is in communication with the first gas chamber 108 through a communication pathway 118 provided at the bottom-section configuration member 36 and the pathway formation member 28.

    [0076] The capacity of the second gas chamber 46 may be set to be greater than the capacity of the deformation space 116, and the capacity of the deformation space 116 may be set to be greater than the capacity of the first gas chamber 108.

    [0077] The present exemplary embodiment configured as described above is capable of exhibiting similar operation and advantageous effects to those of the first exemplary embodiment.

    [0078] When a change in the pressure in the first liquid chamber 20 occurs when vibration is input, the first membrane 106 elastically deforms toward the first gas chamber 108 side, thereby enabling the vibration absorption performance to be enhanced. When this occurs, the state of communication between the first gas chamber 108 and the second gas chamber 46 is switched by the switching section 44, enabling the dynamic spring constant due to the first liquid chamber 20 to be changed.

    [0079] This thereby enables the capacity between the state of communication, in which the first gas chamber 108 and the second gas chamber 46 are in communication with each other, and the state of non-communication, to be changed relatively great. The static spring constant and the dynamic spring constant of the anti-vibration device 100 can thereby be changed largely.

    [0080] Moreover, the capacity of the first gas chamber 108 is smaller than the capacities of the deformation space 116 and the second gas chamber 46. This thereby enables deformation of the first membrane 106 when in the state of non-communication to be suppressed.

    Third Exemplary Embodiment



    [0081] Fig. 4 is a diagram illustrating an anti-vibration device 130 according to a third exemplary embodiment. Portions that are the same as or equivalent to those of the first and second exemplary embodiments are allocated the same reference numerals, and explanation thereof is omitted. Explanation covers only portions that differ from the first and second exemplary embodiments.

    [0082] Namely, the anti-vibration device 130 of the present exemplary embodiment differs from the second exemplary embodiment in the point that the first gas chamber 108 is placed in communication with the second gas chamber 46 through the deformation space 116. Specifically, a first communication pathway 132 is formed in the pathway formation member 28 so as to place the first gas chamber 108 and the deformation space 116 in communication with each other. Moreover, a second communication pathway 134 is formed in the bottom-section configuration member 36 so as to place the deformation space 116 and the second gas chamber 46 in communication with each other through the switching section 44. The switching section 44 is thus configured so as to switch a state of communication between the first gas chamber 108 and the second gas chamber 46 through the deformation space 116.

    [0083] This configuration enables the deformation space 116 at the second membrane 112 provided between the first gas chamber 108 and the second gas chamber 46 to be efficiently utilized as a communication pathway placing the first gas chamber 108 and the second gas chamber 46 in communication with each other.

    [0084] Moreover, the first gas chamber 108 and the deformation space 116 are in communication with each other even when the switching section 44 is set to the state of non-communication. The combined capacity of the first gas chamber 108 and the deformation space 116 is thus greater than that of the first gas chamber 108 alone. This thereby enables a softening to be achieved in static spring and dynamic spring.

    [0085] Note that similar operation and advantageous effects to those of the first exemplary embodiment are obtained when the deformation space 116 that is adjacent to the second liquid chamber 114 is placed in communication with the second gas chamber 46 by the switching section 44. Moreover, the present exemplary embodiment is capable of exhibiting similar operation and advantageous effects to those of the first exemplary embodiment.

    [0086] Note that in each of the exemplary embodiments, explanation has been given regarding cases in which the support body 16 is fixed to the engine side, this being an example of a vibration source, and the cylinder body 12 is coupled to the vehicle body, this being an example of a vibration receiver. However, there is no limitation thereto. Configuration may be made in which the cylinder body 12 is fixed to the side of the engine, which is an example of a vibration source, and the support body 16 is coupled to the side of the vehicle body, which is an example of a vibration receiver.


    Claims

    1. An anti-vibration device (10) comprising:

    a cylinder body (12) coupled to one of a vibration source or a vibration receiver;

    a support body (16) coupled to the other of the vibration source or the vibration receiver;

    an elastic body (14) attaching the support body (16) to the cylinder body (12) such that the support body (16) is capable of moving relative to the cylinder body (12);

    a first liquid chamber (20) housing a liquid and provided between the elastic body (14) and a pathway member (28) that is formed within the cylinder body (12);

    a second liquid chamber (22) provided between the pathway member (28) and a diaphragm (34) that partitions an interior of the cylinder body (12), a liquid flowing between the first liquid chamber (20) and the second liquid chamber (22) through a pathway (30) that is formed by the pathway member (28);

    a first gas chamber (40) provided on an opposite side of the diaphragm (34) from the second liquid chamber (22);

    a second gas chamber (46) isolated from the first gas chamber (40); and

    a switching section (44) switching between a state of communication and a state of non-communication between the first gas chamber (40) and the second gas chamber (46),

    wherein the diaphragm (34) does not configure a wall of the second gas chamber (46),

    wherein the second gas chamber (46) is configured so that when the pressure inside the second liquid chamber (22) changes so as to displace the diaphragm (34), the second gas chamber (46) does not influence the pressure change inside the second liquid chamber (22) so long as the second gas chamber (46) and the first gas chamber (40) are in a state of non-communication, and

    characterized in that, the second gas chamber (46) is only communicable with the first gas chamber (40).


     
    2. The anti-vibration device (10) of claim 1, wherein a capacity of the second gas chamber (46) is greater than a capacity of the first gas chamber (40).
     
    3. An anti-vibration device (100, 130) comprising:

    a cylinder body (12) coupled to one of a vibration source or a vibration receiver;

    a support body (16) coupled to the other of the vibration source or the vibration receiver;

    an elastic body (14) attaching the support body (16) to the cylinder body (12) such that the support body (16) is capable of moving relative to the cylinder body (12);

    a first liquid chamber (20) housing a liquid and provided between the elastic body (14) and a first membrane (106) that partitions an interior of the cylinder body (12);

    a first gas chamber (108) provided between the first membrane (106) and a first partitioning wall (28B) of a pathway member (28) that partitions the interior of the cylinder body (12);

    a second liquid chamber (114) provided between the first partitioning wall (28B) and a second membrane (112) that partitions the interior of the cylinder body (12), a liquid flowing between the first liquid chamber (20) and the second liquid chamber (114) through a pathway (30) formed by the pathway member (28);

    a deformation space (116) provided between the second membrane (112) and a second partitioning wall (361) that partitions the interior of the cylinder body (12), the deformation space (116) forming a deformable region where the second membrane (112) deforms;

    a second gas chamber (46) isolated from the first gas chamber (108); and

    a switching section (44) switching between a state of communication and a state of non-communication between the first gas chamber (108) and the second gas chamber (46),

    wherein the second membrane (112) does not configure a wall of the second gas chamber (46),

    wherein the second gas chamber (46) is configured so that when the pressure inside the second liquid chamber (114) changes so as to displace the second membrane (112), the second gas chamber (46) does not influence the pressure change inside the second liquid chamber (114) so long as the second gas chamber (46) and the first gas chamber (108) are in a state of non-communication, and

    characterized in that, the second gas chamber (46) is only communicable with the first gas chamber (108).


     
    4. The anti-vibration device (100, 130) of claim 3, wherein:

    the first gas chamber (108) is in communication with the second gas chamber (46) through the deformation space (116); and

    the switching section (44) switches a state of the communication between the first gas chamber (108) and the second gas chamber (46) through the deformation space (116).


     
    5. The anti-vibration device (100, 130) of claim 3 or claim 4, wherein a capacity of the second gas chamber (46) is greater than a capacity of the deformation space (116), and the capacity of the deformation space (116) is greater than a capacity of the first gas chamber (108).
     


    Ansprüche

    1. Schwingungsdämpfungsvorrichtung (10), die Folgendes umfasst:

    einen Zylinderkörper (12), der mit dem einen von einer Schwingungsquelle oder einem Schwingungsaufnehmer verbunden ist,

    einen Stützkörper (16), der mit dem anderen von der Schwingungsquelle oder dem Schwingungsaufnehmer verbunden ist,

    einen elastischen Körper (14), der den Stützkörper (16) derart an dem Zylinderkörper (12) befestigt, dass der Stützkörper (16) dazu in der Lage ist, sich im Verhältnis zu dem Zylinderkörper (12) zu bewegen,

    eine erste Flüssigkeitskammer (20), die eine Flüssigkeit aufnimmt und zwischen dem elastischen Körper (14) und einem Leitungsbahnelement (28), das innerhalb des Zylinderkörpers (12) geformt ist, bereitgestellt wird,

    eine zweite Flüssigkeitskammer (22), die zwischen dem Leitungsbahnelement (28) und einer Membran (34), die ein Inneres des Zylinderkörpers (12) unterteilt, bereitgestellt wird, wobei eine Flüssigkeit zwischen der ersten Flüssigkeitskammer (20) und der zweiten Flüssigkeitskammer (22) durch eine Leitungsbahn (30) strömt, die durch das Leitungsbahnelement (28) gebildet wird,

    eine erste Gaskammer (40), die auf einer zu der zweiten Flüssigkeitskammer (22) entgegengesetzten Seite der Membran (34) bereitgestellt wird,

    eine zweite Gaskammer (46), die von der ersten Gaskammer (40) isoliert ist, und

    eine Umschaltsektion (44), die zwischen einem Verbindungszustand und einem Nichtverbindungszustand zwischen der ersten Gaskammer (40) und der zweiten Gaskammer (46) umschaltet,

    wobei die Membran (34) keine Wand der zweiten Gaskammer (46) ausbildet,

    wobei die zweite Gaskammer (46) so konfiguriert ist, dass, wenn sich der Druck innerhalb der zweiten Flüssigkeitskammer (22) so ändert, dass die Membran (34) verschoben wird, die zweite Gaskammer (46) die Druckänderung innerhalb der zweiten Flüssigkeitskammer (22) nicht beeinflusst, solange sich die zweite Gaskammer (46) und die erste Gaskammer (40) in einem Nichtverbindungszustand befinden, und

    dadurch gekennzeichnet, dass

    die zweite Gaskammer (46) nur mit der ersten Gaskammer (40) in Verbindung gebracht werden kann.


     
    2. Schwingungsdämpfungsvorrichtung (10) nach Anspruch 1, wobei ein Fassungsvermögen der zweiten Gaskammer (46) größer ist als ein Fassungsvermögen der ersten Gaskammer (40).
     
    3. Schwingungsdämpfungsvorrichtung (100, 130), die Folgendes umfasst:

    einen Zylinderkörper (12), der mit dem einen von einer Schwingungsquelle oder einem Schwingungsaufnehmer verbunden ist,

    einen Stützkörper (16), der mit dem anderen von der Schwingungsquelle oder dem Schwingungsaufnehmer verbunden ist,

    einen elastischen Körper (14), der den Stützkörper (16) derart an dem Zylinderkörper (12) befestigt, dass der Stützkörper (16) dazu in der Lage ist, sich im Verhältnis zu dem Zylinderkörper (12) zu bewegen,

    eine erste Flüssigkeitskammer (20), die eine Flüssigkeit aufnimmt und zwischen dem elastischen Körper (14) und einer ersten Membran (106), die ein Inneres des Zylinderkörpers (12) unterteilt, bereitgestellt wird,

    eine erste Gaskammer (108), die zwischen der ersten Membran (106) und einer ersten Trennwand (28B) eines Leitungsbahnelements (28), die das Innere des Zylinderkörpers (12) unterteilt, bereitgestellt wird,

    eine zweite Flüssigkeitskammer (114), die zwischen der ersten Trennwand (28B) und einer zweiten Membran (112), die das Innere des Zylinderkörpers (12) unterteilt, bereitgestellt wird, wobei eine Flüssigkeit zwischen der ersten Flüssigkeitskammer (20) und der zweiten Flüssigkeitskammer (114) durch eine Leitungsbahn (30) strömt, die durch das Leitungsbahnelement (28) gebildet wird,

    einen Verformungsraum (116), der zwischen der zweiten Membran (112) und einer zweiten Trennwand (361), die das Innere des Zylinderkörpers (12) unterteilt, bereitgestellt wird, wobei der Verformungsraum (116) einen verformbaren Bereich bildet, wo sich die zweite Membran (112) verformt,

    eine zweite Gaskammer (46), die von der ersten Gaskammer (108) isoliert ist, und

    eine Umschaltsektion (44), die zwischen einem Verbindungszustand und einem Nichtverbindungszustand zwischen der ersten Gaskammer (108) und der zweiten Gaskammer (46) umschaltet,

    wobei die Membran (112) keine Wand der zweiten Gaskammer (46) ausbildet,

    wobei die zweite Gaskammer (46) so konfiguriert ist, dass, wenn sich der Druck innerhalb der zweiten Flüssigkeitskammer (114) so ändert, dass die zweite Membran (112) verschoben wird, die zweite Gaskammer (46) die Druckänderung innerhalb der zweiten Flüssigkeitskammer (114) nicht beeinflusst, solange sich die zweite Gaskammer (46) und die erste Gaskammer (108) in einem Nichtverbindungszustand befinden, und dadurch gekennzeichnet, dass

    die zweite Gaskammer (46) nur mit der ersten Gaskammer (108) in Verbindung gebracht werden kann.


     
    4. Schwingungsdämpfungsvorrichtung (100, 130) nach Anspruch 3, wobei:

    die erste Gaskammer (108) durch den Verformungsraum (116) in Verbindung mit der zweiten Gaskammer (46) steht, und

    die Umschaltsektion (44) einen Verbindungszustand zwischen der ersten Gaskammer (108) und der zweiten Gaskammer (46) durch den Verformungsraum (116) umschaltet.


     
    5. Schwingungsdämpfungsvorrichtung (100, 130) nach Anspruch 3 oder Anspruch 4, wobei ein Fassungsvermögen der zweiten Gaskammer (46) größer ist als ein Fassungsvermögen des Verformungsraums (116) und ein Fassungsvermögen des Verformungsraums (116) größer ist als ein Fassungsvermögen der ersten Gaskammer (108).
     


    Revendications

    1. Dispositif anti-vibrations (10), comprenant :

    un corps cylindrique (12) accouplé à un dispositif parmi une source de vibrations et un récepteur des vibrations ;

    un corps de support (16) accouplé à l'autre dispositif parmi la source de vibrations et le récepteur des vibrations ;

    un corps élastique (14) fixant le corps de support (16) au corps cylindrique (12), de sorte que le corps de support (16) peut se déplacer par rapport au corps cylindrique (12) ;

    une première chambre de liquide (20) contenant un liquide et agencée entre le corps élastique (14) et un élément de passage (28) formé dans le corps cylindrique (12) ;

    une deuxième chambre de liquide (22) agencée entre l'élément de passage (28) et un diaphragme (34) séparant un intérieur du corps cylindrique (12), un liquide s'écoulant entre la première chambre de liquide (20) et la deuxième chambre de liquide (22) à travers un passage (30) formé par l'élément de passage (28) ;

    une première chambre de gaz (40) agencée sur le diaphragme (34), sur un côté opposé à la deuxième chambre de liquide (22) ;

    une deuxième chambre de gaz (46) isolée de la première chambre de gaz (40) ; et

    une section de commutation (44) assurant une commutation entre un état de communication et un état de non communication entre la première chambre de gaz (40) et la deuxième chambre de gaz (46) ;

    dans lequel le diaphragme (34) ne configure pas une paroi de la deuxième chambre de gaz (46) ;

    dans lequel la deuxième chambre de gaz (46) est configurée de sorte que lorsque la pression à l'intérieur de la deuxième chambre de liquide (22) change, de sorte à déplacer le diaphragme (34), la deuxième chambre de gaz (46) n'influence pas le changement de pression à l'intérieur de la deuxième chambre de liquide (22) tant que la deuxième chambre de gaz (46) et la première chambre de gaz (40) se trouvent dans un état de non communication ; et

    caractérisé en ce que :
    la deuxième chambre de gaz (46) peut communiquer uniquement avec la première chambre de gaz (40).


     
    2. Dispositif anti-vibrations (10) selon la revendication 1, dans lequel une capacité de la deuxième chambre de gaz (46) est supérieure à une capacité de la première chambre de gaz (40).
     
    3. Dispositif anti-vibrations (100, 130), comprenant :

    un corps cylindrique (12) accouplé à un dispositif parmi une source de vibrations et un récepteur des vibrations ;

    un corps de support (16) accouplé à l'autre dispositif parmi la source de vibrations et le récepteur des vibrations ;

    un corps élastique (14) fixant le corps de support (16) au corps cylindrique (12), de sorte que le corps de support (16) peut se déplacer par rapport au corps cylindrique (12) ;

    une première chambre de liquide (20) contenant un liquide et agencée entre le corps élastique (14) et une première membrane (106) séparant un intérieur du corps cylindrique (12) ;

    une première chambre de gaz (108) agencée entre la première membrane (106) et une première paroi de séparation (28B) d'un élément de passage (28) séparant l'intérieur du corps cylindrique (12) ;

    une deuxième chambre de liquide (114) agencée entre la première paroi de séparation (28B) et une deuxième membrane (112) séparant l'intérieur du corps cylindrique (12), un liquide s'écoulant entre la première chambre de liquide (20) et la deuxième chambre de liquide (114) à travers un passage (30) formé par l'élément de passage (28) ;

    un espace de déformation (116) agencé entre la deuxième membrane (112) et une deuxième paroi de séparation (361) séparant l'intérieur du corps cylindrique (12), l'espace de déformation (116) formant une région déformable au niveau de laquelle la deuxième membrane (112) se déforme ;

    une deuxième chambre de gaz (46) isolée de la première chambre de gaz (108) ; et

    une section de commutation (44) assurant la commutation entre un état de communication et un état de non communication entre la première chambre de gaz (108) et la deuxième chambre de gaz (46) ;

    dans lequel la deuxième membrane (112) ne configure pas une paroi de la deuxième chambre de gaz (46) ;

    dans lequel la deuxième chambre de gaz (46) est configurée de sorte que lorsque la pression à l'intérieur de la deuxième chambre de liquide (114) change, de sorte à déplacer la deuxième membrane (112), la deuxième chambre de gaz (46) n'influence pas le changement de la pression à l'intérieur de la deuxième chambre de liquide (114) tant que la deuxième chambre de gaz (46) et la première chambre de gaz (108) se trouvent dans un état de non communication ; et

    caractérisé en ce que :
    la deuxième chambre de gaz (46) peut communiquer uniquement avec la première chambre de gaz (108).


     
    4. Dispositif anti-vibrations (100, 130) selon la revendication 3, dans lequel :

    la première chambre de gaz (108) est en communication avec la deuxième chambre de gaz (46) à travers l'espace de déformation (116) ; et

    la section de commutation (44) établit un état de communication entre la première chambre de gaz (108) et la deuxième chambre de gaz (46) à travers l'espace de déformation (116).


     
    5. Dispositif anti-vibrations (100, 130) selon la revendication 3 ou la revendication 4, dans lequel une capacité de la deuxième chambre de gaz (46) est supérieure à une capacité de l'espace de déformation (116), la capacité de l'espace de déformation (116) étant supérieure à une capacité de la première chambre de gaz (108).
     




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    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