Fluid-filled vibration isolator

Abstract

Provided is a fluid-filled vibration isolator having a novel structure capable of stably holding a second mounting member and a cup member in appropriate positions.　This fluid-filled vibration isolator 10 has a structure in which a first mounting member 16 and a second mounting member 18 are connected by a main body rubber elastic body 20 and fluid chambers 94, 96 filled with incompressible fluid are formed inside. The annular second mounting member 18 is provided with a cup member 14 to be inserted in the axial direction, the second mounting member 18 is rubber-press-fitted to the cup member 14 through press-fit rubber 42, a space in the axial direction between the insertion tip surface of the second mounting member 18 and the cup member 14 is sealed by sealing rubber 40, and engagement rubber 44 integrated with the press-fit rubber 42 provided on the outer peripheral surface of the second mounting member 18 is engaged with the cup member 14 to position the second mounting member 18 and the cup member 14 relative to each other in the axial direction.

Description

Fluid-filled vibration isolation device

[0001] The present invention relates to a fluid-filled vibration damping device used in an engine mount of an automobile or the like.

[0002] Fluid-filled vibration damping devices that utilize a vibration-damping effect based on the flow action of a fluid sealed inside have traditionally been used in automobile engine mounts and the like. As disclosed, for example, in Japanese Patent Laid-Open No. 2017-082991 (Patent Document 1), a fluid-filled vibration damping device has a structure in which a first mounting member and a second mounting member are connected by a main rubber elastic body, and a fluid chamber in which a non-compressible fluid is sealed is provided inside. When vibration is input to the fluid-filled vibration damping device, a vibration-damping effect based on the flow action of the fluid is exerted.

[0003] JP 2017-082991 A

[0004] Incidentally, in the fluid-filled vibration damping device disclosed in Patent Document 1, a cup member is attached to a second mounting member, and an incompressible fluid is sealed in a fluid chamber. In Patent Document 1, a press-fit rubber is fixed to the outer peripheral surface of the second mounting member, a seal rubber protrudes from the press-fit tip surface of the second mounting member, the second mounting member is press-fitted into the cup member via the press-fit rubber, and the seal rubber is compressed between the second mounting member and the cup member side, thereby forming a fluid-tight seal between the second mounting member and the cup member side.

[0005] However, because the seal rubber is compressed in the rubber press-fit direction between the second mounting member and the cup member, the second mounting member is easily displaced in the direction of removal from the cup member due to springback of the seal rubber, making it difficult to properly position and hold the second mounting member and the cup member. Furthermore, when the second mounting member is press-fitted into the cup member via the press-fit rubber, the second mounting member is fitted into the cup member in a state where the press-fit rubber is shear-deformed, which makes the second mounting member easily displaced in the direction of removal from the cup member due to springback of the press-fit rubber. As a result, there is a risk of variations in the compression allowance of the seal rubber, resulting in unstable sealing performance. Furthermore, when a bracket is attached to the second mounting member, as in Patent Document 1, there is a risk of problems with bracket attachment.

[0006] An object of the present invention is to provide a fluid-filled vibration-damping device of a novel structure that can stably hold the second mounting member and the cup member in an appropriate assembly position.

[0007] The following describes preferred embodiments for understanding the present invention, but the embodiments described below are merely examples and may be appropriately combined with one another. Multiple components described in each embodiment may be recognized and employed independently to the greatest extent possible, and may also be appropriately combined with any of the components described in other embodiments. Accordingly, the present invention is not limited to the embodiments described below, and various other embodiments may be realized.

[0008] In the first aspect, in a fluid-filled vibration damping device having a structure in which a first mounting member and a second mounting member are connected by a main rubber elastic body and a fluid chamber in which a non-compressible fluid is sealed is formed, the annular second mounting member is rubber press-fitted into a cup member via a press-fit rubber provided on the outer peripheral surface, a seal rubber is provided on the insertion tip surface of the second mounting member into the cup member, and the axial distance between the insertion tip surface of the second mounting member and the cup member is sealed by the seal rubber, an engaging rubber integral with the press-fit rubber is provided on the outer peripheral surface of the second mounting member, and the second mounting member and the cup member are positioned relative to each other in the axial direction by the engagement between the engaging rubber and the cup member.

[0009] In a fluid-filled vibration damping device constructed in accordance with this embodiment, the second mounting member is press-fitted into the cup member via the press-fit rubber, thereby sealing the axial space between the second mounting member and the cup member with the seal rubber, thereby ensuring liquid-tightness of the fluid chamber.

[0010] When the second mounting member and the cup member are subjected to a force in the removal direction due to, for example, springback of the press-fit rubber or seal rubber, the second mounting member and the cup member may be displaced in the direction of removal from each other, reducing the amount of compression of the seal rubber and reducing the liquid-tightness of the fluid chamber. Therefore, by engaging the cup member with an engaging rubber formed integrally with the press-fit rubber, relative displacement of the second mounting member and the cup member in the removal direction due to springback or the like can be prevented, and the liquid-tightness of the fluid chamber can be stably ensured.

[0011] Since the connecting portion between the second mounting member and the cup member is constructed by a rubber press-fit structure using press-fit rubber and an engagement structure using engaging rubber, abnormal noise caused by friction at the connecting portion between the second mounting member and the cup member is less likely to become a problem.

[0012] In the second aspect, in the fluid-filled vibration-damping device described in the first aspect, the engaging rubber is a rubber protrusion that protrudes further outward than the pressed-in rubber, and the rubber protrusion is inserted perpendicular to the axis into an engaging hole that penetrates the peripheral wall of the cup member, so that the rubber protrusion is engaged in the axial direction with the inner surface of the engaging hole in the cup member.

[0013] With a fluid-filled vibration damping device constructed in accordance with this embodiment, the relative displacement of the second mounting member and the cup member in the removal direction can be limited by a simple structure consisting of rubber protrusions protruding outward and engagement holes penetrating the peripheral wall of the cup member.

[0014] In a third aspect, in the fluid-filled vibration damping device described in the second aspect, the second mounting member is a flat ring having a long side and a short side when viewed in the axial direction, and the rubber protrusion is provided on the long side portion of the second mounting member.

[0015] In a fluid-filled vibration-damping device constructed in accordance with this embodiment, an engagement hole is formed in the long side portion of the peripheral wall of the cup member, which is cylindrical and corresponds to the outer shape of the second mounting member, thereby reducing resistance when inserting the rubber protrusion into the engagement hole and making it easier to assemble the second mounting member and the cup member.

[0016] In a fourth aspect, in the fluid-filled vibration damping device described in the second or third aspect, the second mounting member is a flattened ring having long and short sides when viewed in the axial direction, and the rubber protrusions are provided at the corners of the second mounting member.

[0017] With a fluid-filled vibration-damping device constructed in accordance with this embodiment, an engagement hole is provided in the corner where the deformation rigidity of the cup member is relatively high, making it difficult for the rubber protrusion to come out of the engagement hole, and the positioning of the second mounting member and the cup member by the engagement between the rubber protrusion and the engagement hole is more likely to be maintained stably.

[0018] A fifth aspect is a fluid-filled vibration-damping device described in any one of the first to fourth aspects, wherein the cup member is provided with a hook portion that protrudes from the peripheral wall portion toward the insertion base end side of the second mounting member, and the hook portion is engaged with the engaging rubber in the axial direction.

[0019] With a fluid-filled vibration damping device constructed according to this aspect, there is no need to provide holes in the peripheral wall of the cup member for engaging with the engaging rubber, and a large area can be secured for the rubber to be pressed in. Furthermore, the hook portion protruding from the cup member engages with the engaging rubber provided closer to the base end of the press-fit rubber, thereby positioning the second mounting member and the cup member, and the seal rubber ensures liquid-tightness of the fluid chamber.

[0020] In a sixth aspect, in the fluid-filled vibration damping device described in the fifth aspect, the cup member is a flattened ring having a long side and a short side when viewed in the axial direction, and the hook portion is provided on the short side of the cup member.

[0021] With a fluid-filled vibration-damping device constructed in accordance with this embodiment, deformation is suppressed at the short side of the cup member where the hook portion is provided, making it difficult for the engagement between the engaging rubber and the hook portion to be released, and more stable sealing performance can be achieved.

[0022] A seventh aspect is a fluid-filled vibration-damping device described in any one of the first to sixth aspects, in which the engaging rubber protrudes to the outer periphery beyond the pressed-in rubber, and the engaging rubber is positioned closer to the insertion base end than the center of the pressed-in rubber in the insertion direction of the second mounting member.

[0023] With a fluid-filled vibration-damping device constructed in accordance with this embodiment, it is possible to position the second mounting member and the cup member by engaging the engaging rubber with the cup member while ensuring the area of ​​the rubber press-fit portion of the second mounting member into the cup member.

[0024] According to the present invention, the second mounting member and the cup member can be stably held in an appropriate assembly position in a fluid-filled type vibration damping device.

[0025] 9A and 9B are cross-sectional views of the mount body shown in FIG. 6, corresponding to the VIII-VIII cross section of FIG. 9; IX-IX cross section of FIG. 7; X-X cross section of FIG. 7; and IX-X cross section of FIG. 7. A perspective view of a cup member that constitutes the engine mount shown in FIG. 1. A cross-sectional view of the cup member shown in FIG. 11, corresponding to the XII-XII cross section of FIG. 13. 12 is a cross-sectional view taken along XIII-XIII in FIG. 12; a perspective view showing the engine mount of FIG. 1 with a bracket attached; a longitudinal cross-sectional view of the engine mount of FIG. 1 with the bracket attached, which corresponds to the XV-XV cross-section of FIG. 16; a XVI-XVI cross-sectional view of FIG. 15; a XVIII-XVII cross-sectional view of FIG. 15; a XVIII-XVIII cross-sectional view of FIG. 15; a XIX-XIX cross-sectional view of FIG. 18; a perspective view of an engine mount according to a second embodiment of the present invention; a cross-sectional view of the engine mount shown in FIG. 20; a longitudinal cross-sectional view of an engine mount according to a third embodiment of the present invention; a longitudinal cross-sectional view of the engine mount of FIG. 22 with a bracket attached.

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0027] Figures 1 to 5 show an automotive engine mount 10 as a first embodiment of a fluid-filled vibration damping device constructed in accordance with the present invention. The engine mount 10 has a structure in which a cup member 14 is attached to a mount main body 12. As shown in Figures 6 to 10, the mount main body 12 has a structure in which a first mounting member 16 and a second mounting member 18 are connected by a main rubber elastic body 20. In the following description, as a general rule, the up-down direction refers to the up-down direction in Figure 2, which is the direction of the mount's central axis, which is the main load input direction; the front-rear direction refers to the left-right direction in Figure 2; and the left-right direction refers to the left-right direction in Figure 3.

[0028] The first mounting member 16 has an overall cylindrical shape or an inverted truncated cone shape that decreases in diameter downward, and is provided with a screw hole 22 that opens to the top surface. The first mounting member 16 is a highly rigid member and may be made of, for example, a fiber-reinforced synthetic resin, but is preferably made of a metal such as an aluminum alloy.

[0029] As shown in Figures 8 to 10, the second mounting member 18 has a generally rounded rectangular tubular shape with arc-shaped corners. It has a flat shape with a pair of long sides extending in the front-rear direction and a pair of short sides extending in the left-right direction when viewed in the axial direction. The second mounting member 18 also has flange-shaped portions 24 that protrude from its upper end toward its outer periphery. Fitting portions 26 that extend linearly in the left-right direction are integrally formed on both the front and rear outer sides of the flange-shaped portions 24 on the pair of short sides. The fitting portions 26 are generally rectangular prism-shaped, with their vertical width gradually decreasing toward the left. A cylindrical crimping pin 28 that protrudes toward the left is integrally formed on the left end face of the fitting portion 26. The second mounting member 18 is a highly rigid member, and, like the first mounting member 16, is preferably made of fiber-reinforced synthetic resin, metal, or the like. The second mounting member 18 also has a larger diameter than the first mounting member 16.

[0030] 8 and 9 , the first mounting member 16 is disposed above the second mounting member 18 and on substantially the same central axis, with the main rubber elastic body 20 disposed between the first mounting member 16 and the second mounting member 18. The main rubber elastic body 20 has a substantially frustum shape with an outer circumferential surface tapered downward, with the first mounting member 16 inserted and vulcanization-bonded to the upper end, which is the smaller diameter end, and the second mounting member 18 superimposed and vulcanization-bonded to the outer circumferential surface of the lower end, which is the larger diameter end. In this way, the main rubber elastic body 20 is formed as an integrally vulcanization-molded product comprising the first mounting member 16 and the second mounting member 18, and the mount main body 12 of this embodiment is constituted by this integrally vulcanization-molded main rubber elastic body 20. The second mounting member 18, which is fixed to the main rubber elastic body 20, has a fixing portion 30 integrally formed at its upper portion that protrudes inward, and the inner diameter of the upper portion where the fixing portion 30 is provided is smaller than the inner diameter of the lower portion (press-fit tubular portion 32) that is separated from the fixing portion 30. The inner peripheral surface of the fixing portion 30 is tapered so that the diameter decreases downward.

[0031] A recess 34 that opens downward is formed in the main rubber elastic body 20. The recess 34 is shaped like an inverted bowl with a diameter that decreases toward the top base, and is located more inward than the fastening portion 30 of the second mounting member 18. By forming the recess 34, the portion of the main rubber elastic body 20 that connects the first mounting member 16 and the second mounting member 18 has a tapered shape in which both the inner diameter and outer diameter increase downward.

[0032] The press-fit tubular portion 32, which is the lower portion of the second mounting member 18, is covered with a rubber layer 36 that is integrally formed with the main rubber elastic body 20. The rubber layer 36 is provided so as to cover the entire inner circumferential surface and the lower portion of the outer circumferential surface of the press-fit tubular portion 32. The inner circumferential rubber 38 that covers the inner circumferential surface of the press-fit tubular portion 32 in the rubber layer 36 is thicker at the upper portion than the lower portion, and the outer circumferential portion of the thicker upper portion is fixed to the underside of the fixing portion 30, and the inner circumferential end of the upper portion is integrally continuous with the main rubber elastic body 20.

[0033] The portion of the rubber layer 36 that covers the underside of the press-fit tubular portion 32 is a seal rubber 40. The seal rubber 40 is formed continuously around the entire circumference with a tapered cross-sectional shape that narrows radially downward. The portion of the seal rubber 40 with the greatest protruding height is located at a position that overlaps with the underside of the press-fit tubular portion 32 when projected in the up-down direction. The maximum thickness (protruding height) of the seal rubber 40 is greater than the thickness of the inner circumferential rubber 38 and the press-fit rubber 42, which will be described later.

[0034] The portion of the rubber layer 36 that covers the outer peripheral surface of the press-fit tubular portion 32 is a press-fit rubber 42. The press-fit rubber 42 is formed so as to cover the outer peripheral surface of the lower portion of the press-fit tubular portion 32. The outer peripheral surface of the lower portion of the press-fit rubber 42 has a tapered shape that becomes smaller in diameter as it goes downward.

[0035] A pair of rubber projections 44, 44 serving as engaging rubbers are integrally formed with the press-fit rubber 42. As shown in Figures 6, 7, 9 and 10, the rubber projections 44 project outward from the rubber layer 36 (press-fit rubber 42) fixed to the long side portion of the second mounting member 18, with the protruding tip positioned closer to the outer periphery in the short side direction of the second mounting member 18 than the press-fit rubber 42. The rubber projections 44 are desirably positioned above the center in the up-down direction of the press-fit rubber 42 (towards the insertion base end of the second mounting member 18 relative to the cup member 14, which will be described later), and in this embodiment, they are provided at the upper end of the press-fit rubber 42.

[0036] More specifically, the rubber protrusion 44 integrally comprises a connecting portion 46 that protrudes outward to the left and right with a substantially constant protrusion height and extends in the front-to-rear direction, and a plurality of rib-like portions 48 provided below the connecting portion 46. The connecting portion 46 is generally rectangular plate-shaped overall, and is longer in the front-to-rear direction than in the left-to-right direction, which is the protruding direction. The connecting portion 46 protrudes outward from the upper end of the press-fit rubber 42 that is fixed to the outer circumferential surface of the press-fit cylindrical portion 32, and the second mounting member 18 is exposed above the connecting portion 46.

[0037] The rib-like portions 48 protrude outward to the left and right below the connecting portion 46. The rib-like portions 48 extend in the vertical direction, and their upper ends are integrally connected to the connecting portion 46. The rib-like portions 48 protrude outward to the left and right as they extend upward, and are shaped like a substantially right-angled triangle when viewed in the front-to-rear direction. Each rubber protrusion 44 includes a plurality of rib-like portions 48, which are spaced apart from one another in the front-to-rear direction. In this embodiment, five rib-like portions 48, 48, 48, 48, 48 are arranged at equal intervals in the front-to-rear direction, and the front-to-rear outer surfaces of the rib-like portions 48, 48 located at both front and rear ends are positioned substantially flush with the front and rear end surfaces of the connecting portion 46.

[0038] 6 to 8, a rubber fitting 50 formed integrally with the main rubber elastic body 20 is fixed to the fitting portion 26 of the second mounting member 18. The rubber fitting 50 is provided on a portion of the fitting portion 26 in the left-right direction, and covers both the front and rear and the top and bottom of the fitting portion 26. In this embodiment, a step is provided in the portion of the rubber fitting 50 that covers both the top and bottom of the fitting portion 26, and the front and rear outer sides of the step are thicker than the inside. In this embodiment, the rubber fitting 50 has a right-side portion with approximately constant top-to-bottom outer dimensions in the left-to-right direction, and a left-side portion with gradually smaller top-to-bottom outer dimensions toward the left, with a thicker middle portion in the left-to-right direction.

[0039] As shown in Figures 11 to 13, the cup member 14 is integrally provided with a peripheral wall portion 52 that is a substantially rounded rectangular cylindrical shape corresponding to the second mounting member 18, and a bottom wall portion 54 that is provided to close the lower opening of the peripheral wall portion 52.

[0040] The peripheral wall portion 52 integrally includes a partition insertion portion 56 that protrudes upward from the outer peripheral end of the bottom wall portion 54, and a base press-fit portion 58 that protrudes upward from the outer peripheral end of the partition insertion portion 56. The base press-fit portion 58 is thinner than the partition insertion portion 56, and preferably has a radial thickness dimension that is half or less of that of the partition insertion portion 56.

[0041] A pair of engagement holes 60, 60 are formed in the base press-fit portion 58 of the peripheral wall portion 52, penetrating the long side portion in the left-right direction. The engagement holes 60 are holes with a substantially rectangular cross section that correspond to the rubber protrusions 44 of the mount main body 12, and are provided above the vertical center of the base press-fit portion 58. The engagement holes 60 have a front-to-back width dimension that is equal to or greater than the front-to-back width dimension of the rubber protrusions 44, and a vertical height dimension that is smaller than the front-to-back height dimension of the rubber protrusions 44.

[0042] A through hole 62 that penetrates in the vertical direction is formed in the bottom wall portion 54. By forming this through hole 62, the bottom wall portion 54 is formed into an inner flange shape that protrudes inward at the lower end of the peripheral wall portion 52.

[0043] Although the cup member 14 is made of a hard material, it is desirable that it be able to tolerate a certain degree of radial bending deformation, particularly at the base press-fit portion 58, and although it may be made of metal, it is preferably formed of a hard synthetic resin (including fiber-reinforced synthetic resin).

[0044] 2 and 5 , the press-fit cylindrical portion 32 of the second mounting member 18 of the mount main body 12 is axially inserted into the base press-fit portion 58 of the peripheral wall portion 52 of the cup member 14. The press-fit rubber 42 of the rubber layer 36 is compressed between the outer peripheral surface of the press-fit cylindrical portion 32 of the second mounting member 18 and the inner peripheral surface of the base press-fit portion 58 of the cup member 14. In this way, the second mounting member 18 and the cup member 14 are positioned relative to each other, with the press-fit cylindrical portion 32 of the second mounting member 18 being rubber press-fitted into the base press-fit portion 58 of the cup member 14 via the press-fit rubber 42.

[0045] The gap between the press-fit cylindrical portion 32 of the second mounting member 18 and the peripheral wall portion 52 of the cup member 14 is liquid-tightly sealed by the seal rubber 40 and press-fit rubber 42, which are part of the rubber layer 36. That is, the seal rubber 40, which covers the lower surface, which is the leading end surface of the second mounting member 18 inserted into the cup member 14, is compressed between the upper and lower opposing surfaces of the lower surface of the press-fit cylindrical portion 32 of the second mounting member 18 and the upper surface of the partition insertion portion 56 of the cup member 14, thereby liquid-tightly sealing the gap between the upper and lower opposing surfaces of the press-fit cylindrical portion 32 and the partition insertion portion 56. The press-fit rubber 42 is also compressed between the radially opposing surfaces of the outer circumferential surface of the press-fit cylindrical portion 32 and the inner circumferential surface of the base press-fit portion 58, thereby liquid-tightly sealing the gap between the radially opposing surfaces of the press-fit cylindrical portion 32 and the base press-fit portion 58.

[0046] 3 to 5, the rubber projection 44 protruding from the press-fit rubber 42 is inserted into an engagement hole 60 formed through the peripheral wall 52 of the cup member 14. The upper surface of the rubber projection 44 is vertically overlapped with the inner surface of the engagement hole 60, thereby vertically engaging the rubber projection 44 with the inner surface of the engagement hole 60. This limits upward relative displacement of the mount body 12 with respect to the cup member 14, preventing separation of the mount body 12 and the cup member 14, and positioning and holding the second mounting member 18 and the cup member 14 relative to each other in the vertical direction. As a result, the rubber press-fit state into the base press-fit portion 58 of the press-fit cylindrical portion 32 via the press-fit rubber 42 is stably maintained, and a stable sealing state is maintained between the second mounting member 18 and the cup member 14 by the rubber layer 36 (seal rubber 40 and press-fit rubber 42).

[0047] The seal rubber 40 covering the underside of the press-fit cylindrical portion 32 of the second mounting member 18 is pressed against the upper surface of the partition insertion portion 56 of the cup member 14, and the seal rubber 40 is compressed in the vertical direction between the press-fit cylindrical portion 32 and the partition insertion portion 56, so that a release force due to the elasticity of the seal rubber 40 acts between the second mounting member 18 and the cup member 14. In the engine mount 10, the second mounting member 18 and the cup member 14 are positioned relative to each other in the axial direction (vertical direction) by the engagement between the rubber protrusions 44 and the inner surface of the engagement hole 60, so that axial positional displacement of the second mounting member 18 and the cup member 14 due to the elastic restoring force of the seal rubber 40 is effectively prevented.

[0048] Furthermore, because the press-fit cylindrical portion 32 of the second mounting member 18 is rubber press-fitted into the base press-fit portion 58 of the cup member 14 via the press-fit rubber 42, a release force caused by the elastic restoring force of the press-fit rubber 42 that is deformed when the rubber is press-fitted also acts between the second mounting member 18 and the cup member 14. In the engine mount 10, the second mounting member 18 and the cup member 14 are positioned relative to each other in the axial direction by the engagement between the rubber protrusions 44 and the inner surface of the engagement hole 60, preventing axial positional displacement of the second mounting member 18 and the cup member 14 caused by the elastic restoring force of the press-fit rubber 42.

[0049] Furthermore, because the rubber protrusion 44 is provided above the vertical center of the press-fit rubber 42, the axial length of the press-fit rubber 42 is set long below the rubber protrusion 44, and the axial length of the rubber press-fit portion of the second mounting member 18 and the cup member 14 via the press-fit rubber 42 below the rubber protrusion 44 is sufficiently secured. Therefore, the second mounting member 18 and the cup member 14 are more strongly positioned and held in the axial direction by the rubber press-fitting. Particularly in this embodiment, because the rubber protrusion 44 is provided at the upper end of the press-fit rubber 42, the axial length of the rubber press-fit portion by the press-fit rubber 42 is secured longer, and greater positioning and holding force can be obtained by the press-fitting.

[0050] Furthermore, when transporting the engine mount 10 in a standalone state without the outer bracket 102 described below attached, even if an external force acts to separate the mount body 12 and the cup member 14 in the vertical direction, the rubber protrusion 44 engages with the inner surface of the engagement hole 60, more reliably preventing separation of the mount body 12 and the cup member 14 and maintaining sealing performance, making it easier to manage the engine mount 10 when storing or transporting it.

[0051] 3, in this embodiment, the rib-shaped portion 48 of the rubber projection 44 is pressed against the lower opening edge of the engagement hole 60, and the rubber projection 44 is urged upward by the elasticity of the rib-shaped portion 48. Therefore, the upper surface of the connecting portion 46 of the rubber projection 44 is pressed against the inner surface of the engagement hole 60, and the mount body 12 and the cup member 14 are positioned in the up-down direction. Note that the mount body 12 and the cup member 14 are also positioned in the left-right direction by the rib-shaped portion 48 being pressed against the opening periphery of the engagement hole 60.

[0052] In this embodiment, the rubber protrusions 44 are provided on the long side portions of the second mounting member 18, and the engagement holes 60 into which the rubber protrusions 44 are inserted are formed on the long side portions of the cup member 14, which have a relatively low radial deformation rigidity. This allows the rubber protrusions 44 to be inserted into the engagement holes 60 while pushing apart the base press-fit portion 58 of the cup member 14 with a relatively small force.

[0053] A partition member 64 and a flexible membrane 66 are disposed between the mount body 12 and cup member 14 combined in this manner, thereby forming the engine mount 10. As shown in Figures 2 to 5, the partition member 64 is shaped as a generally rounded rectangular plate overall, and has a structure in which a cover fitting 70 is superimposed on and fixed to the top surface of a partition member body 68.

[0054] The partition member main body 68 is shaped like a thick plate overall, and has a circumferential groove 72 extending circumferentially around the outer periphery and opening to the upper surface. The circumferential groove 72 extends a length less than the entire circumference, and as shown in FIG. 4, a lower communication port 74 penetrating the bottom wall is formed at one circumferential end. Furthermore, a storage recess 76 opening to the upper surface and a lightening recess 78 opening to the lower surface are formed on the inner circumferential side of the partition member main body 68 from the circumferential groove 72. A columnar central insertion portion 80 protruding upward from the bottom wall is provided in the center of the storage recess 76. A plurality of lower through-holes 82 penetrating the bottom wall of the storage recess 76 in the vertical direction are formed.

[0055] A movable membrane 84 is housed in the accommodation recess 76. The movable membrane 84 is formed of a rubber elastic body and has a generally rounded square plate shape corresponding to the accommodation recess 76. An insertion hole 86 that penetrates in the vertical direction is formed in the central portion of the movable membrane 84, and when housed in the accommodation recess 76, the central insertion portion 80 of the partition member main body 68 is inserted into the insertion hole 86, thereby positioning the movable membrane 84 within the accommodation recess 76. The movable membrane 84 is thick-walled at its outer circumferential edge and around the insertion hole 86, and is thinner in its radially intermediate portion.

[0056] A lid fitting 70 is superimposed on the upper surface of the partition member main body 68. The lid fitting 70 is a flat plate with a rounded rectangular shape corresponding to the partition member main body 68 when viewed from the top and bottom, and is made of a metal such as an aluminum alloy or stainless steel. As shown in Figure 5, the lid fitting 70 has an upper communication port 88 that penetrates the outer circumferential end in the vertical direction, and a plurality of upper through holes 90 that penetrate the inner circumferential portion in the vertical direction.

[0057] 2 to 4, the lid fitting 70 is fixed to the partition member main body 68 in a state where it is superimposed on the upper surface of the partition member main body 68, and the partition member 64 is constituted by the partition member main body 68, the movable membrane 84, and the lid fitting 70. By superimposing the lid fitting 70 on the partition member main body 68, the upper opening of the circumferential groove 72 is covered by the lid fitting 70, thereby forming a tunnel-like passage. In addition, the upper opening of the accommodation recess 76 is covered by the lid fitting 70, forming a cavity, and the movable membrane 84 is accommodated in this cavity. The thick-walled inner and outer circumferential ends of the movable membrane 84 are compressed in the vertical direction between the lid fitting 70 and the bottom wall of the accommodation recess 76 in the partition member main body 68, and the upper surface of the thin-walled radially middle portion is spaced downward from the lid fitting 70.

[0058] The partition member 64 is arranged so that its upper portion is inserted into the press-fit tubular portion 32 of the second mounting member 18 of the mount main body 12 and its lower portion is inserted into the partition insertion portion 56 of the cup member 14, and so as to extend in the perpendicular direction between the mount main body 12 and the cup member 14. In this embodiment, the outer peripheral surface of the partition member main body 68 is fitted into the press-fit tubular portion 32 of the second mounting member 18 via the inner circumferential rubber 38, and is also fitted into the partition insertion portion 56 of the cup member 14, thereby positioning the partition member 64 with respect to the mount main body 12 and the cup member 14. As shown in an enlarged view in Figure 3, in the standalone state of the engine mount 10 before the outer bracket 102 is attached, the outer peripheral end of the cover fitting 70 is spaced downward from the portion of the inner circumferential rubber 38 that covers the underside of the fastening portion 30.

[0059] A flexible membrane 66 is disposed below the partition member 64. The flexible membrane 66 is formed of rubber or a resin elastomer, has a thin, dome-like shape, and is flexible enough to allow deformation in the thickness direction. A relatively thick, annular retaining portion 92 is provided at the outer peripheral end of the flexible membrane 66. The retaining portion 92 is sandwiched vertically over the entire circumference between the partition member main body 68 and the bottom wall portion 54 of the cup member 14, so that the flexible membrane 66 is disposed to cover the lower part of the partition member 64. The thin-walled inner peripheral portion of the flexible membrane 66 is exposed downward through the through-hole 62 in the bottom wall portion 54 of the cup member 14, and the through-hole 62 allows deformation such as downward bulging.

[0060] Between the mount body 12 and the partition member 64, a pressure-receiving chamber 94 is formed, which serves as a fluid chamber whose walls are partially formed by the main rubber elastic body 20 and whose internal pressure fluctuates when vibration is input. Between the partition member 64 and the flexible membrane 66, an equilibrium chamber 96 is formed, which serves as a fluid chamber whose walls are partially formed by the flexible membrane 66 and whose volume is allowed to change. The pressure-receiving chamber 94 and the equilibrium chamber 96 are filled with an incompressible fluid such as water, ethylene glycol, alkylene glycol, silicone oil, or a mixture thereof. In the engine mount 10, the gap between the mount body 12 and the cup member 14 is sealed by the rubber layer 36 including the seal rubber 40, and the gap between the cup member 14 and the partition member 64 is sealed by the retaining portion 92 of the flexible membrane 66, preventing leakage of the incompressible fluid contained therein.

[0061] The circumferential groove 72 of the partition member 64 is in communication with the pressure-receiving chamber 94 through the upper communication port 88 and is in communication with the equilibrium chamber 96 through the lower communication port 74, and an orifice passage 98 that interconnects the pressure-receiving chamber 94 and the equilibrium chamber 96 is formed by the circumferential groove 72 and the upper and lower communication ports 88, 74. The tuning frequency of the orifice passage 98, which is the resonance frequency of the flowing fluid, is set to the frequency of the vibration to be damped, and is tuned to the frequency of low-frequency vibration such as engine shake, for example.

[0062] The movable membrane 84 of the partition member 64 has an upper surface to which the fluid pressure of the pressure-receiving chamber 94 is applied through the upper through-hole 90, and a lower surface to which the fluid pressure of the equilibrium chamber 96 is applied through the lower through-hole 82. When the relative pressure between the pressure-receiving chamber 94 and the equilibrium chamber 96 fluctuates, the radially middle portion of the movable membrane 84 deforms vertically, thereby performing the function of transmitting fluid pressure between the pressure-receiving chamber 94 and the equilibrium chamber 96.

[0063] As shown in Figures 14 to 19, an inner bracket 100 and an outer bracket 102 are attached to the engine mount 10. The inner bracket 100 is a thick plate extending in the left-right direction as a whole, and in this embodiment, its right end is attached to the first mounting member 16, while its left end is attached to the vehicle's power unit. In this embodiment, the right end of the inner bracket 100 is fixed to the first mounting member 16 by a bolt 104 threaded into the threaded hole 22. The left end of the inner bracket 100, which is attached to the power unit, is wide in the front-to-rear direction and has a plurality of first fastening holes 106 penetrating it in the up-down direction. The inner bracket 100 is preferably made of a metal such as iron, and is a highly rigid member.

[0064] The outer bracket 102 includes a mount receiving cavity 108 into which the engine mount 10 is inserted and assembled. The mount receiving cavity 108 is recessed and opens to the right, and includes a pair of fitting grooves 110, 110 that open to the inner surface of the front and rear walls. As shown in FIG. 18 , the fitting groove 110 extends linearly in the left-right direction, and in this embodiment, its vertical dimension increases toward the right. The fitting groove 110 reaches the right end of the outer bracket 102 and opens to the right, but does not reach the left end. A rear wall portion 112 is provided to the left of the fitting groove 110. A pin insertion hole 114 corresponding to the crimping pin 28 of the second mounting member 18 is formed through the rear wall portion 112 in the left-right direction.

[0065] As shown in Figure 17, a window 115 penetrating the upper part in the left-right direction is formed in the left wall of the mount accommodating cavity 108 of the outer bracket 102. The outer bracket 102 is provided with a pair of attachment pieces 116, 116 protruding to both the front and rear at its lower end. As shown in Figures 14 and 15, each attachment piece 116 has a second fastening hole 117 penetrating in the vertical direction. As shown in Figures 15 to 17, an open hole 118 penetrating in the vertical direction is formed in the lower wall of the mount accommodating cavity 108 of the outer bracket 102, and the open hole 118 allows downward deformation of the flexible membrane 66.

[0066] The outer bracket 102 is attached to the second mounting member 18 side of the engine mount 10. That is, as shown in Figures 18 and 19, the front and rear fitting portions 26, 26 of the second mounting member 18 are fitted into the front and rear fitting grooves 110, 110 of the mount accommodating cavity 108 of the outer bracket 102, and the lower surface of the cup member 14 connected to the second mounting member 18 is placed on the upper surface of the lower wall of the mount accommodating cavity 108, thereby attaching the outer bracket 102 to the second mounting member 18 side of the engine mount 10. When the outer bracket 102 is attached to the engine mount 10, the mount main body 12 and the cup member 14 are positioned relative to each other by the outer bracket 102.

[0067] As shown in FIG. 18 , the fitting groove 110 has a vertical dimension that gradually increases toward the right, and the fitting portion 26 is inserted from the opening on the right end of the fitting groove 110 toward the left, facilitating insertion of the fitting portion 26 into the fitting groove 110. As shown in FIG. 18 , the fitting portion 26 has a vertical dimension that is smaller than that of the fitting groove 110, and is not sandwiched between the upper and lower inner surfaces of the fitting groove 110. The upper and lower inner surfaces of the fitting groove 110 and the upper and lower inner surfaces of the fitting portion 26 are indirectly in contact with each other via rubber fittings 50 fixed to the surface of the fitting portion 26. Note that, as shown in FIG. 19 , the front and rear outer surfaces of the fitting portion 26 are indirectly in contact with the front and rear groove inner surfaces of the fitting groove 110 via the rubber fittings 50. In short, the fitting portion 26 is in a rubber press-fit state, fitted into the fitting groove 110 via the rubber fittings 50.

[0068] 18 and 19 , with the fitting portion 26 fitted into the fitting groove 110, the crimping pin 28 protruding from the left end surface of the fitting portion 26 is inserted into a pin insertion hole 114 formed in the inner wall portion 112 of the fitting groove 110. Then, by applying an axial (left-right) compressive force to the crimping pin 28 inserted into the pin insertion hole 114 and crushing the tip portion of the crimping pin 28, the tip portion of the crimping pin 28 is expanded in diameter and is crimped and fixed to the inner circumferential surface of the opening of the pin insertion hole 114. This prevents the fitting portion 26 from displacing to the right relative to the outer bracket 102, prevents the fitting portion 26 from coming out of the fitting groove 110 to the right, and prevents separation of the engine mount 10 and the outer bracket 102.

[0069] When the outer bracket 102 is attached to the engine mount 10, the inner bracket 100 fixed to the first mounting member 16 has its left end, which is the mounting portion to the power unit, protruding to the left of the outer bracket 102 through the window portion 115 of the outer bracket 102, as shown in Figures 16 and 17.

[0070] 15 to 17, by attaching the outer bracket 102 to the engine mount 10, the mount body 12 and the cup member 14 are closer to each other in the vertical direction than when the engine mount 10 is in a standalone state. This brings the press-fit cylindrical portion 32 of the second mounting member 18 closer to the upper surface of the partition insertion portion 56 of the cup member 14, and the seal rubber 40 is compressed more greatly between the press-fit cylindrical portion 32 and the upper surface of the partition insertion portion 56, thereby improving the sealing performance of the seal rubber 40 between the second mounting member 18 and the cup member 14.

[0071] 16 , by attaching the outer bracket 102 to the engine mount 10, the inner circumferential rubber 38 covering the underside of the fixing portion 30 of the second mounting member 18 is pressed liquid-tight against the upper surface of the partition member 64, preventing a short circuit between the pressure-receiving chamber 94 and the equilibrium chamber 96 through the outer periphery of the partition member 64. By pressing the fixing portion 30 against the partition member 64 via the inner circumferential rubber 38, the retaining portion 92 of the flexible membrane 66 is more firmly sandwiched between the underside of the partition member 64 and the bottom wall portion 54 of the cup member 14, thereby improving the sealing performance of the retaining portion 92.

[0072] As described above, the engine mount 10 alone, without the outer bracket 102 attached, is in a temporary sealed state in which the sealing performance is sufficient to prevent incompressible fluid from leaking to the outside. By attaching the outer bracket 102 to the engine mount 10, the sealing performance is improved and a full sealed state is achieved in which short circuits between the pressure-receiving chamber 94 and the equilibrium chamber 96 are also prevented.

[0073] As shown in Figure 16, when the outer bracket 102 is attached to the engine mount 10, the rubber protrusion 44 is spaced downward from the upper inner surface of the engagement hole 60 of the cup member 14, but the mount body 12 and the cup member 14 are positioned in the vertical direction by the outer bracket 102 and are prevented from separating.

[0074] The engine mount 10 is mounted on a vehicle and used by attaching the first mounting member 16 to the power unit via an inner bracket 100 and the second mounting member 18 to the vehicle body via an outer bracket 102. When vertical vibrations are input between the first mounting member 16 and the second mounting member 18, a vibration-damping effect is achieved based on fluid flow and the like. That is, when low-frequency vibrations corresponding to engine shake are input, relative pressure fluctuations between the pressure-receiving chamber 94 and the equilibrium chamber 96 cause fluid flow between the chambers 94, 96 through the orifice passage 98, thereby achieving a vibration-damping effect (high damping effect) based on fluid flow. When medium- to high-frequency vibrations such as idling vibrations or booming noise are input, the deformation of the movable membrane 84 transmits hydraulic pressure between the chambers 94, 96, preventing the pressure-receiving chamber 94 from becoming substantially sealed, thereby achieving a vibration-damping effect (vibration isolation effect) based on a low-dynamic spring.

[0075] 20 and 21 show an engine mount 120 for an automobile as a second embodiment of a fluid-filled type vibration damping device constructed in accordance with the present invention. In the following description, components and parts that are substantially the same as those in the first embodiment are given the same reference numerals in the drawings and description thereof will be omitted.

[0076] The engine mount 120 is prevented from slipping out of the cup member 126 by inserting a rubber protrusion 124, which serves as an engaging rubber and protrudes outward from the press-fit rubber 42 in the mount body 122, into an engaging hole 128 formed in the peripheral wall portion 52 of the cup member 126.

[0077] The rubber protrusions 124 protrude outward to the left and right at corners 130 of the second mounting member 18, which is a generally rounded square tube, and are provided at four locations around the circumference. The corners 130 of the second mounting member 18 are curved in an arc shape when viewed in the vertical direction. The rubber protrusions 124 of this embodiment are generally square prism-shaped, and the outer peripheral surface, which is the protruding tip surface, is a curved surface that corresponds to the outer peripheral surface of the cup member 126. The outer dimensions of the rubber protrusions 124 in the vertical and horizontal directions are smaller than the inner dimensions of the engagement hole 128 in the vertical and horizontal directions.

[0078] The engagement holes 128 are formed in curved corners 132 of the peripheral wall portion 52 (base press-fit portion 58) of the cup member 126, which is a generally rounded rectangular tube, and are provided penetrating the cup member 126 in the left-right direction at four locations around the circumference. The curved corners 132 are curved in an arc shape when viewed in the vertical direction, similar to the corners 130 of the second mounting member 18. The engagement holes 128 in this embodiment have a generally uniform rectangular cross-sectional shape.

[0079] The lower end of the mount body 122 is press-fitted into the base press-fit portion 58 of the cup member 126 via the press-fit rubber 42, thereby connecting the mount body 122 and the cup member 126 to each other.

[0080] Additionally, each rubber protrusion 124 provided on the mount body 122 is inserted into each engagement hole 128 provided in the cup member 126, with the upper surfaces of the rubber protrusions 124 overlapping the upper inner surface of the engagement hole. This limits the upward relative displacement of the mount body 122 with respect to the cup member 126, positions the mount body 122 and the cup member 126 relative to each other in the up-down direction, and prevents separation due to disengagement.

[0081] In this embodiment, the rubber protrusions 124 provided at each of the four corners 130 of the second mounting member 18 are inserted into engagement holes 128 provided at each of the four curved corners 132 of the cup member 126, and are locked in the vertical direction. The corners 130 of the second mounting member 18 and the curved corners 132 of the cup member 126 both have arc-shaped cross-sectional shapes, which provide high shape stability and are resistant to deformation. This stabilizes the engagement between the rubber protrusions 124 and the engagement holes 128, more effectively preventing separation of the mount main body 122 and the cup member 126 that would otherwise result from disengagement.

[0082] Furthermore, since a slip-out prevention structure is provided at four circumferential locations by engaging the rubber protrusions 124 with the engagement holes 128, a greater slip-out prevention effect can be obtained compared to when it is provided at only two locations on the opposite side.

[0083] 22 shows an automobile engine mount 140 as a third embodiment of a fluid-filled vibration damping device constructed in accordance with the present invention. In engine mount 140, hook portions 148 provided on cup member 146 are hooked onto and axially engaged with rubber protrusions 144 serving as engaging rubber that protrude outward from press-fit rubber 42 of mount body 142, thereby positioning mount body 142 and cup member 146 in the axial direction and preventing mount body 142 from slipping out of cup member 146.

[0084] The rubber protrusions 144 of this embodiment are provided to protrude in the front-to-rear direction from the short side portions of the second mounting member 18. The upper surface of the rubber protrusions 144 extends substantially perpendicular to the up-down direction, and the lower surface is an inclined surface that slopes upward toward the protruding tip (outward in the front-to-rear direction).

[0085] The hook portions 148 are provided to protrude upward (toward the insertion base end of the mount body 142 relative to the cup member 146) from the base body press-fit portion 58 of the cup member 146, and have a concave shape that opens inwardly in the front and rear directions in the longitudinal cross section shown in Figure 22. One hook portion 148 is provided on each of a pair of short sides of the cup member 146. Because the hook portions 148 are provided partially in the circumferential direction, they have less deformation rigidity than the cylindrical base body press-fit portion 58, and can be deformed, for example, tilted outward in the front and rear directions, with a relatively small input.

[0086] The lower end of the mount body 142 is press-fitted into the base press-fit portion 58 of the cup member 146 via the press-fit rubber 42, thereby connecting the mount body 142 and the cup member 146 to each other.

[0087] Additionally, hook portions 148 provided on cup member 146 are hooked onto rubber protrusions 144 provided on mount body 142, respectively, and the top surfaces of rubber protrusions 144 are overlapped in the vertical direction with hook portions 148. By axially engaging rubber protrusions 144 and hook portions 148 in this manner, upward relative displacement of mount body 142 with respect to cup member 146 is limited, and mount body 142 and cup member 146 are positioned relative to each other in the vertical direction, preventing separation due to disengagement.

[0088] In this embodiment, the engaging portion of the cup member 146 that engages with the rubber protrusions 144 is constituted by hook portions 148. The hook portions 148 are provided partially on the circumference, protruding upward from the peripheral wall portion 52 of the cup member 146, so that when the rubber protrusions 144 pass over the top of the hook portions 148, the hook portions 148 are relatively easily pushed outward and open toward the outer periphery. This makes it easy to hook the hook portions 148 onto the rubber protrusions 144 and engage them, facilitating the process of connecting the mount main body 142 and the cup member 146.

[0089] Hook portion 148 is provided on a short side portion of peripheral wall portion 52 of cup member 146, which has greater deformation rigidity than the long side portion. This prevents hook portion 148 from opening excessively due to deformation of peripheral wall portion 52 of cup member 146, and the engagement state between rubber protrusion 144 and hook portion 148 is stably maintained.

[0090] As shown in Figure 23, when the outer bracket 102 is attached to the engine mount 140, the hook portion 148 is spaced apart from the upper surface of the rubber protrusion 144, and the engagement between the hook portion 148 and the rubber protrusion 144 is released. However, since the second mounting member 18 and the cup member 146 are held in position relative to each other in the vertical direction by the outer bracket 102, separation of the mount body 142 and the cup member 146 is prevented.

[0091] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the specific descriptions. For example, the rubber protrusions 44 and engagement holes 60 may be formed on both the long and short sides, or two may be provided on one long or short side. Similarly, the number and arrangement of the hook portions 148 are not limited.

[0092] In the first embodiment, the engine mount 10, when it is in a standalone state with the mount body 12 and cup member 14 connected, is in a temporary sealed state that is sufficient to prevent fluid leakage to the outside, and when the outer bracket 102 is attached to the engine mount 10, it becomes fully sealed when in use.However, for example, the amount of compressive deformation of the sealing rubber 40 can also be set so that the engine mount 10 becomes fully sealed when it is in a standalone state.

[0093] In the first embodiment, a rubber protrusion 44 that protrudes further outward than the press-fit rubber is exemplified as the engaging rubber, but for example, a step that is continuous circumferentially, either partially or entirely, can be provided on the outer circumferential surface of the press-fit rubber 42 so that the hook portion 148 on the cup member 14 can be hooked onto the step and engaged, in which case the engaging rubber is formed by the step portion of the press-fit rubber 42.

[0094] The second mounting member 18 and the cup member 14 are not necessarily limited to a rounded rectangular shape when viewed in the vertical direction, and may be, for example, a circular or oval shape when viewed in the vertical direction.

[0095] REFERENCE SIGNS LIST 10 Engine mount (first embodiment, fluid-filled vibration damping device) 12 Mount body 14 Cup member 16 First mounting member 18 Second mounting member 20 Main rubber elastic body 22 Screw hole 24 Flange-shaped portion 26 Fitting portion 28 Caulking pin 30 Fixing portion 32 Press-fit cylindrical portion 34 Recess 36 Rubber layer 38 Inner circumferential rubber 40 Seal rubber 42 Press-fit rubber 44 Rubber protrusion (engagement rubber) 46 Connecting portion 48 Rib-shaped portion 50 Fitting rubber 52 Peripheral wall portion 54 Bottom wall portion 56 Partition insertion portion 58 Base press-fit portion 60 Engagement hole 62 Through-hole 64 Partition member 66 Flexible membrane 68 Partition member main body 70 Cover fitting 72 Circumferential groove 74 Lower communication port 76 Accommodation recess 78 Lightening recess 80 Central insertion portion 82 Lower through-hole 84 Movable membrane 86 Insertion hole 88 Upper communication port 90 Upper through-hole 92 Holding portion 94 Pressure-receiving chamber (fluid chamber) 96 Equilibrium chamber (fluid chamber) 98 Orifice passage 100 Inner bracket 102 Outer bracket 104 Bolt 106 First fastening hole 108 Mount accommodation space 110 Fitting groove 112 Back wall portion 114 Pin insertion hole 115 Window portion 116 Mounting piece 117 Second fastening hole 118 Open hole 120 Engine mount (Second embodiment of fluid-filled vibration damping device) 122 Mount body 124 Rubber protrusion (engaging rubber) 126 Cup member 128 Engaging hole 130 Corner portion 132 curved corner portion 140 engine mount (third embodiment fluid-filled type vibration damping device) 142 mount body 144 rubber protrusion (engagement rubber) 146 cup member 148 hook portion

Claims

1. A fluid-filled vibration-proof device having a structure in which a first mounting member and a second mounting member are connected by a main rubber elastic body and a fluid chamber in which a non-compressible fluid is sealed is formed, wherein the annular second mounting member is press-fitted into a cup member via a press-fit rubber provided on its outer circumferential surface, a seal rubber is provided on the insertion tip face of the second mounting member into the cup member, and the axial space between the insertion tip face of the second mounting member and the cup member is sealed by the seal rubber, and an engagement rubber integrated with the press-fit rubber is provided on the outer circumferential surface of the second mounting member, and the second mounting member and the cup member are positioned relative to each other in the axial direction by the engagement of the engagement rubber with the cup member.

2. A fluid-filled vibration-proof device as described in claim 1, wherein the engaging rubber is a rubber protrusion that protrudes further outward than the pressed-in rubber, the rubber protrusion is inserted perpendicular to the axis into an engaging hole that penetrates the peripheral wall of the cup member, and the rubber protrusion engages with the inner peripheral surface of the engaging hole in the cup member in the axial direction.

3. A fluid-filled vibration isolation device as set forth in claim 2, wherein the second mounting member is a flattened ring having long and short sides when viewed in the axial direction, and the rubber protrusion is provided on the long side of the second mounting member.

4. A fluid-filled vibration-damping device as claimed in claim 2 or 3, wherein the second mounting member is a flattened ring having long sides and short sides when viewed in the axial direction, and the rubber protrusions are provided at the corners of the second mounting member.

5. A fluid-filled vibration-proof device as claimed in any one of claims 1 to 4, wherein the cup member is provided with a hook portion which protrudes from the peripheral wall portion towards the base end side of the insertion of the second mounting member, and the hook portion is engaged with the engaging rubber in the axial direction.

6. A fluid-filled vibration-proof device as set forth in claim 5, wherein the cup member is a flattened ring having long and short sides when viewed in the axial direction, and the hook portion is provided on the short side of the cup member.

7. A fluid-filled vibration-damping device as claimed in any one of claims 1 to 6, wherein the engaging rubber protrudes to the outer periphery beyond the pressed-in rubber, and the engaging rubber is positioned closer to the insertion base end than the centre of the pressed-in rubber in the insertion direction of the second mounting member.

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