Fluid-filled vibration isolator

Abstract

To provide a fluid-filled vibration isolator having a novel structure capable of stably holding a second mounting member and a cup member in appropriate positions.SOLUTION: A 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 an incompressible fluid are formed. The fluid-filled vibration isolator 10 includes a cup member 14 in which the annular second mounting member 18 is inserted in an 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 an insertion tip surface of the second mounting member 18 and the cup member 14 is sealed by sealing rubber 40. Engagement rubber 44 integrated with the press-fit rubber 42 provided on an 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.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a fluid-filled type vibration isolating device for use in engine mounts of automobiles, etc. [Background technology]

[0002] Fluid-filled vibration-damping devices that utilize the vibration-damping effect based on the flow action of a fluid sealed inside have been used in automobile engine mounts and the like. As disclosed in, for example, JP 2017-082991 A (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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-082991 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the fluid-filled vibration-damping device shown in Patent Document 1, a cup member is attached to the second mounting member, and a non-compressible fluid is filled in the fluid chamber. In Patent Document 1, a press-fit rubber is fixed to the outer circumferential 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 sealing the second mounting member and the cup member side fluid-tightly.

[0005] However, since the seal rubber is compressed in the rubber press-in 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 the spring back of the seal rubber, making it difficult to properly position and hold the second mounting member and the cup member. In addition, 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 in which the press-fit rubber is shear-deformed, so the second mounting member is easily displaced in the direction of removal from the cup member due to the spring back of the press-fit rubber. As a result, there is a risk that the compression allowance of the seal rubber will vary, making the sealing performance unstable. In addition, when a bracket is attached to the second mounting member as in Patent Document 1, there is a risk that the bracket's attachment will be hindered.

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

[0007] The following describes preferred embodiments for understanding the present invention, but the embodiments described below are merely illustrative and may be combined with one another as appropriate, and the multiple components described in each embodiment may be recognized and used independently as far as possible, and may also be combined with any of the components described in another embodiment as appropriate. As a result, the present invention is not limited to the embodiments described below, and various other embodiments may be realized.

[0008] The first aspect is 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-pressed into a cup member via a pressed-in rubber provided on its outer peripheral 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, an engaging rubber integral with the pressed-in 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 engagement between the engaging rubber and the cup member.

[0009] In a fluid-filled vibration-damping device constructed according to this embodiment, the second mounting member is rubber-pressed into the cup member via the press-fit rubber, thereby sealing the axial space between the second mounting member and the cup member with sealing 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 the 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 the risk of reducing the liquid-tightness of the fluid chamber. Therefore, by engaging the cup member with an engagement rubber formed integrally with the press-fit rubber, it is possible to prevent the second mounting member and the cup member from being displaced relative to each other in the removal direction due to springback or the like, and to stably ensure the liquid-tightness of the fluid chamber.

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

[0012] In a second aspect, in the fluid-filled vibration-damping device described in the first aspect, the engaging rubber is a rubber protrusion that protrudes outward further 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 axially engaged 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 between the second mounting member and the cup member in the removal direction can be limited by a simple structure consisting of rubber protrusions protruding toward the outer periphery 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 flattened 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 cylindrical cup member which corresponds to the outer shape of the second mounting member, thereby reducing resistance when inserting the rubber protrusion into the engagement hole, 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] In a fluid-filled vibration-damping device constructed in accordance with this embodiment, an engagement hole is provided in a corner portion 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 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 in the axial direction with the engaging rubber.

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

[0020] A sixth aspect is a fluid-filled vibration-damping device according to any one of the first to fifth aspects, wherein 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 portion of the cup member on which 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 obtained.

[0022] A seventh aspect is a fluid-filled vibration-damping device described in any one of the first to sixth aspects, wherein the engaging rubber protrudes to the outer periphery beyond the pressed-in rubber, and the engaging rubber is positioned toward the insertion base end side rather 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 according to this embodiment, it is possible to ensure the area of ​​the rubber press-fit portion of the second mounting member into the cup member, while achieving positioning of the second mounting member and the cup member by engaging the engaging rubber with the cup member. Effect of the Invention

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

[0025] [Figure 1] FIG. 1 is a perspective view showing an engine mount according to a first embodiment of the present invention; [Diagram 2] FIG. 2 is a vertical cross-sectional view of the engine mount shown in FIG. 1, which corresponds to the cross-section II-II of FIG. [Diagram 3] III-III cross section of Figure 2 [Figure 4] IV-IV cross section of Figure 2 [Diagram 5] VV cross section of Figure 2 [Figure 6] FIG. 2 is a perspective view of a mount body constituting the engine mount shown in FIG. 1. [Figure 7] Right side view of the mount body shown in Figure 6 [Figure 8] 8 is a cross-sectional view of the mount body shown in FIG. 6, which corresponds to the cross section VIII-VIII of FIG. 9. [Figure 9] IX-IX cross section of Figure 7 [Figure 10] Cross-sectional view of Figure 7 [Figure 11] FIG. 2 is a perspective view of a cup member constituting the engine mount shown in FIG. [Figure 12] 12 is a cross-sectional view of the cup member shown in FIG. 11, which corresponds to the cross-section XII-XII of FIG. 13. [Figure 13] XIII-XIII sectional view of Figure 12 [Figure 14] FIG. 2 is a perspective view showing a state in which a bracket is attached to the engine mount of FIG. [Figure 15] FIG. 15 is a vertical cross-sectional view of the engine mount in the bracket-attached state shown in FIG. 14, which corresponds to the cross-section XV-XV of FIG. 16. [Figure 16] Sectional view XVI-XVI of Figure 15 [Figure 17] Sectional view of FIG. 15 taken along the line XVII-XVII [Figure 18] Sectional view of XVIII-XVIII in FIG. [Figure 19] Section XIX-XIX of Fig. 18 [Figure 20] FIG. 1 is a perspective view showing an engine mount according to a second embodiment of the present invention; [Figure 21] Cross-sectional view of the engine mount shown in Figure 20 [Figure 22] FIG. 11 is a vertical cross-sectional view showing an engine mount according to a third embodiment of the present invention. [Diagram 23] FIG. 23 is a vertical cross-sectional view showing the engine mount of FIG. 22 with a bracket attached thereto. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0027] 1 to 5 show an engine mount 10 for an automobile as a first embodiment of a fluid-filled vibration-damping device constructed according to the present invention. The engine mount 10 has a structure in which a cup member 14 is attached to a mount body 12. As shown in Figs. 6 to 10, the mount 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 Fig. 2 which is the mount central axial direction which is the main load input direction, the front-rear direction refers to the left-right direction in Fig. 2, and the left-right direction refers to the left-right direction in Fig. 3.

[0028] The first mounting member 16 is generally cylindrical or has 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, fiber-reinforced synthetic resin, but is preferably made of a metal such as an aluminum alloy.

[0029] As shown in Figs. 8 to 10, the second mounting member 18 is a generally rounded rectangular tube with its corners curved in an arc shape, and is 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 a flange-shaped portion 24 protruding from the upper end toward the outer periphery, and fitting portions 26 extending linearly in the left-right direction are integrally formed on both the front and rear outer sides of the flange-shaped portion 24 provided on the pair of short sides. The fitting portion 26 is generally rectangular prism-shaped, and the vertical width dimension gradually decreases toward the left. A cylindrical caulking pin 28 protruding toward the left is integrally formed on the left end surface of the fitting portion 26. The second mounting member 18 is a highly rigid member, and is preferably formed of fiber-reinforced synthetic resin, metal, or the like, similar to the first mounting member 16. 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 on approximately the same central axis, and the main rubber elastic body 20 is disposed between the first mounting member 16 and the second mounting member 18. The main rubber elastic body 20 is approximately frustum-shaped with an outer circumferential surface tapered to a larger diameter downward, and the first mounting member 16 is inserted into the upper end, which is the small diameter end, and vulcanization-bonded, while the second mounting member 18 is superimposed and vulcanization-bonded to the outer circumferential surface of the lower end, which is the large diameter end. In this way, the main rubber elastic body 20 is formed as an integrally vulcanization-molded product including 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 product of the main rubber elastic body 20. The second mounting member 18, which is fixed to the main rubber elastic body 20, has an upper part integrally formed with a fixing part 30 that protrudes toward the inner circumference, and the inner diameter of the upper part where the fixing part 30 is provided is smaller than the inner diameter of the lower part (press-fitted cylindrical part 32) free from the fixing part 30. The inner peripheral surface of the fixing part 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 cone with a smaller diameter toward the upper base side, 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 the 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 formed integrally 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 covering 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 thicker outer circumferential portion of the upper portion is fixed to the lower surface of the fixing portion 30, and is integrally continuous with the main rubber elastic body 20 at the inner circumferential end portion of the upper portion.

[0033] The portion of the rubber layer 36 covering the lower surface 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 maximum protruding height is located at a position that overlaps with the lower surface 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 made larger than the thickness of the inner circumferential rubber 38 and the press-fit rubber 42 described below.

[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 toward the bottom.

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

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

[0037] The rib-like portion 48 protrudes outward to the left and right below the connecting portion 46. The rib-like portion 48 extends in the vertical direction, and its upper end is integrally connected to the connecting portion 46. The rib-like portion 48 protrudes outward to the left and right as it goes upward, and is in the shape of a substantially right-angled triangle when viewed in the front-rear direction. Each rubber protrusion 44 has a plurality of rib-like portions 48, and the plurality of rib-like portions 48 are spaced apart from each other in the front-rear direction. In this embodiment, five rib-like portions 48, 48, 48, 48 are arranged at equal intervals in the front-rear direction, and the front-rear outer surfaces of the rib-like portions 48, 48 located at both front and rear ends are located on substantially the same plane as the front-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 covering both the top and bottom of the fitting portion 26, and the front and rear outer sides of the step are thicker than the inner side. In this embodiment, the rubber fitting 50 has a right side portion with a substantially constant top-bottom outer dimension in the left-right direction, and a left side portion with a gradually smaller top-bottom outer dimension toward the left, and is thicker in the middle in the left-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 tube corresponding to the second mounting member 18, and a bottom wall portion 54 that is arranged to cover the lower opening of the peripheral wall portion 52.

[0040] The peripheral wall portion 52 is integrally provided with 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 than that of the partition insertion portion 56.

[0041] A pair of engagement holes 60, 60 penetrating the long side portion in the left-right direction are formed in the base press-fit portion 58 of the peripheral wall portion 52. 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-rear width dimension that is equal to or greater than the front-to-rear width dimension of the rubber protrusions 44, and a vertical height dimension that is smaller than the front-to-rear height dimension of the rubber protrusions 44.

[0042] A through hole 62 that penetrates in the up-down 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 inwardly at the lower end of the peripheral wall portion 52.

[0043] The cup member 14 is a hard member, but it is desirable that radial bending deformation be permitted to a certain extent, especially 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 tubular portion 32 of the second mounting member 18 in the mount body 12 is axially inserted into the base press-fit portion 58 of the peripheral wall portion 52 of the cup member 14. Then, the press-fit rubber 42 of the rubber layer 36 is compressed between the outer peripheral surface of the press-fit tubular 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 manner, the second mounting member 18 and the cup member 14 are positioned relative to each other by the press-fit tubular 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 tube 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 the press-fit rubber 42, which are part of the rubber layer 36. That is, the seal rubber 40 covering the lower surface, which is the insert end surface of the second mounting member 18 into the cup member 14, is compressed between the upper and lower opposing surfaces of the lower surface of the press-fit tube 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 between the upper and lower opposing surfaces of the press-fit tube portion 32 and the partition insertion portion 56. The press-fit rubber 42 is compressed between the radially opposing surfaces of the outer circumferential surface of the press-fit tube portion 32 and the inner circumferential surface of the base press-fit portion 58, thereby liquid-tightly sealing between the radially opposing surfaces of the press-fit tube portion 32 and the base press-fit portion 58.

[0046] As shown in Figs. 3 to 5, the rubber projection 44 protruding from the press-fit rubber 42 is inserted into the engagement hole 60 formed through the peripheral wall portion 52 of the cup member 14. The upper surface of the rubber projection 44 is overlapped with the inner surface of the engagement hole 60 in the vertical direction, so that the rubber projection 44 and the inner surface of the engagement hole 60 are engaged with each other in the vertical direction. This limits the upward relative displacement of the mount body 12 with respect to the cup member 14, prevents the mount body 12 and the cup member 14 from being separated, and holds the second mounting member 18 and the cup member 14 in position 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 tube portion 32 via the press-fit rubber 42 is stably maintained, so that the space between the second mounting member 18 and the cup member 14 is stably sealed by the rubber layer 36 (seal rubber 40 and press-fit rubber 42).

[0047] The seal rubber 40 covering the lower surface of the press-fit tubular 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 tubular portion 32 and the partition insertion portion 56, so that a disengagement 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 rubber protrusions 44 engaging with the inner surface of the engagement hole 60, so that axial positional deviation between the second mounting member 18 and the cup member 14 caused by the elastic restoring force of the seal rubber 40 is effectively prevented.

[0048] In addition, because the press-fit tubular 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 pull-out force caused by the elastic restoring force of the press-fit rubber 42 that is deformed when the rubber is pressed in 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 rubber protrusions 44 engaging with the inner surface of the engagement hole 60, so that axial positional deviation between the second mounting member 18 and the cup member 14 caused by the elastic restoring force of the press-fit rubber 42 is prevented.

[0049] In addition, since the rubber protrusion 44 is provided above the center of the press-fit rubber 42 in the up-down direction, the axial length of the press-fit rubber 42 is set longer 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, since 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 a large positioning and holding force by the press-fitting can be obtained.

[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 is applied that separates the mount body 12 and the cup member 14 in the vertical direction, the rubber protrusions 44 will engage with the inner surface of the engagement hole 60, thereby more reliably preventing separation of the mount body 12 and the cup member 14 and maintaining the sealing performance, making it easier to manage the engine mount 10 during storage, transportation, etc.

[0051] 3, in this embodiment, the rib-like 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-like 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-like 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 in 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 and widening 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 assembled in this manner, thereby forming the engine mount 10. As shown in Figures 2 to 5, the partition member 64 is shaped as a whole in a generally rectangular plate shape with rounded corners, and has a structure in which a cover fitting 70 is superimposed on and fixed to the upper surface of a partition member body 68.

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

[0055] A movable membrane 84 is accommodated in the accommodation recess 76. The movable membrane 84 is formed of a rubber elastic body, and has a generally rounded rectangular plate shape corresponding to the accommodation recess 76. An insertion hole 86 penetrating in the vertical direction is formed in the central part of the movable membrane 84, and when accommodated in the accommodation recess 76, the central insertion part 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 has a thick outer circumferential end and a periphery of the insertion hole 86, and a thinner radial middle part.

[0056] A lid fitting 70 is superimposed on the upper surface of the partition member main body 68. The lid fitting 70 is in the form of a flat plate with rounded rectangular corners corresponding to the partition member main body 68 when viewed in the vertical direction, and is made of a metal such as an aluminum alloy or stainless steel. As shown in Fig. 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] As shown in Figs. 2 to 4, the cover 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 cover fitting 70. By superimposing the cover fitting 70 on the partition member main body 68, the upper opening of the circumferential groove 72 is covered by the cover fitting 70 to form a tunnel-like passage. In addition, the upper opening of the accommodation recess 76 is covered by the cover fitting 70 to form a void, and the movable membrane 84 is accommodated in this void. The thick-walled inner and outer circumferential ends of the movable membrane 84 are compressed in the vertical direction between the bottom wall of the accommodation recess 76 in the partition member main body 68 and the cover fitting 70, and the upper surface of the thin-walled radially middle portion is spaced downward from the cover fitting 70.

[0058] The partition member 64 has an upper portion inserted into the press-fit tubular portion 32 of the second mounting member 18 of the mount main body 12, and a lower portion inserted into the partition insertion portion 56 of the cup member 14, and is disposed so as to spread in the vertically perpendicular direction between the mount main body 12 and the cup member 14. In this embodiment, the outer circumferential 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 individual state of the engine mount 10 before the outer bracket 102 is attached, the outer circumferential end of the cover fitting 70 is spaced downward from the portion of the inner circumferential rubber 38 that covers the underside of the fixing portion 30.

[0059] A flexible film 66 is disposed below the partition member 64. The flexible film 66 is formed of rubber or resin elastomer, has a thin dome shape, and has flexibility that allows deformation in the thickness direction. A relatively thick annular holding portion 92 is provided at the outer peripheral end of the flexible film 66. The holding portion 92 is sandwiched in the vertical direction 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 film 66 is disposed so as to cover the lower part of the partition member 64. The thin inner peripheral portion of the flexible film 66 is exposed downward through the through hole 62 of 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 as a fluid chamber, the wall of which is partly formed by the main rubber elastic body 20, and in which internal pressure fluctuations are induced when vibration is input. Between the partition member 64 and the flexible membrane 66, a balance chamber 96 is formed as a fluid chamber, the wall of which is partly formed by the flexible membrane 66, and in which volume change is permitted. The pressure-receiving chamber 94 and the balance 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 filled inside.

[0061] The circumferential groove 72 of the partition member 64 communicates with the pressure-receiving chamber 94 through the upper communication port 88 and with the equilibrium chamber 96 through the lower communication port 74, and an orifice passage 98 that communicates between 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 resonant 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 subjected to the fluid pressure of the pressure-receiving chamber 94 through the upper through hole 90, and a lower surface subjected to the fluid pressure of the equilibrium chamber 96 through the lower through hole 82. When the relative pressure between the pressure-receiving chamber 94 and the equilibrium chamber 96 varies, the radial middle portion of the movable membrane 84 deforms vertically, thereby achieving the function of transmitting fluid pressure between the pressure-receiving chamber 94 and the equilibrium chamber 96.

[0063] As shown in Figs. 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, the right end portion is a portion attached to the first attachment member 16, and the left end portion is a portion attached to the power unit of the vehicle. The right end portion of the inner bracket 100 in this embodiment is fixed to the first attachment member 16 by a bolt 104 screwed into the screw hole 22. The left end portion of the inner bracket 100 attached to the power unit is wide in the front-rear direction, and a plurality of first fastening holes 106 are formed penetrating the inner bracket 100 in the up-down direction. The inner bracket 100 is desirably formed of a metal such as iron, and is a highly rigid member.

[0064] The outer bracket 102 has a mount receiving space 108 into which the engine mount 10 is inserted and assembled. The mount receiving space 108 is recessed and opens to the right, and has a pair of fitting grooves 110, 110 that open on the inner wall surfaces on both the front and rear sides. As shown in FIG. 18, the fitting groove 110 extends linearly in the left-right direction, and in this embodiment, the 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 back 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 penetrating the back wall portion 112 in the left-right direction.

[0065] As shown in Fig. 17, a window 115 is formed in the left wall of the mount accommodating cavity 108 in the outer bracket 102, penetrating the upper part in the left-right direction. The outer bracket 102 is provided with a pair of attachment pieces 116, 116 protruding toward both the front and rear at the lower end. Each attachment piece 116 is formed with a second fastening hole 117 penetrating in the vertical direction, as shown in Figs. 14 and 15. As shown in Figs. 15 to 17, a vertically penetrating open hole 118 is formed in the lower wall of the mount accommodating cavity 108 in 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 at the right end side of the fitting groove 110 toward the left side, making it easy to insert 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 the fitting rubber 50 fixed to the surface of the fitting portion 26. Note that 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 fitting rubber 50, as shown in FIG. 19. In short, the fitting portion 26 is in a rubber press-fit state in which it is fitted into the fitting groove 110 via the fitting rubber 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 a rear 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 to crush the tip portion of the crimping pin 28, the tip portion of the crimping pin 28 is expanded and deformed, and is crimped and fixed to the inner circumferential surface of the opening portion of the pin insertion hole 114. This prevents the fitting portion 26 from displacing to the right with respect to the outer bracket 102, prevents the fitting portion 26 from coming off to the right from the fitting groove 110, 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 a 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 state where it is alone. As a result, the press-fit tubular portion 32 of the second mounting member 18 and the upper surface of the partition insertion portion 56 of the cup member 14 are closer to each other, and the seal rubber 40 is compressed more greatly between the press-fit tubular 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 circumferential side 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, etc. between the pressure-receiving chamber 94 and the equilibrium chamber 96 are prevented.

[0073] As shown in Figure 16, when the outer bracket 102 is attached to the engine mount 10, the rubber projection 44 is spaced downward from the upper inner surface of the engagement hole 60 in 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 side via an inner bracket 100 and attaching the second mounting member 18 to the vehicle body side via an outer bracket 102. When vertical vibration is input between the first mounting member 16 and the second mounting member 18, a vibration-damping effect based on the flow action of fluid is exerted. That is, when low-frequency vibration equivalent to engine shake is input, the relative pressure fluctuation between the pressure-receiving chamber 94 and the equilibrium chamber 96 causes a fluid flow between the two chambers 94, 96 through the orifice passage 98, and a vibration-damping effect (high damping effect) based on the flow action of fluid is exerted. When medium- to high-frequency vibration such as idling vibration or booming noise is input, the hydraulic pressure is transmitted between the two chambers 94, 96 due to the deformation of the movable membrane 84, and the pressure-receiving chamber 94 is prevented from becoming a high-dynamic spring due to the substantial sealing of the pressure-receiving chamber 94, and a vibration-damping effect (vibration isolation effect) due to the low-dynamic spring is exerted.

[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 explanation, the same reference numerals are used in the drawings to denote components and parts that are substantially the same as those in the first embodiment, and explanations 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 serving as an engaging rubber that protrudes outward from the pressed-in 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 substantially rounded rectangular tube, and are provided at four locations in the circumferential direction. 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 substantially rectangular prism-shaped, and the outer circumferential surface, which is the protruding tip surface, is a curved surface that corresponds to the outer circumferential 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 substantially rounded rectangular cylinder, and are provided penetrating in the left-right direction at four locations in the circumferential direction. The curved corners 132 are curved in an arc shape when viewed in the up-down direction, similar to the corners 130 of the second mounting member 18. The engagement holes 128 in this embodiment have a substantially 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, whereby the mount body 122 and the cup member 126 are connected 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, and the upper surface of the rubber protrusion 124 is overlapped with 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, and the mount body 122 and the cup member 126 are positioned relative to each other in the up-down direction, preventing separation due to coming loose.

[0081] In this embodiment, the rubber protrusions 124 provided at the four corners 130, 130, 130, 130 of the second mounting member 18 are inserted into the engagement holes 128 provided at the four curved corners 132, 132, 132, 132 of the cup member 126, and are engaged in the vertical direction. The corners 130 of the second mounting member 18 and the curved corners 132 of the cup member 126 each have a cross-sectional shape that is curved in an arc, so that the shape is highly stable and is difficult to deform. Therefore, the engagement state between the rubber protrusions 124 and the engagement holes 128 is stable, and separation of the mount main body 122 and the cup member 126 that accompanies release of the engagement state is more effectively prevented.

[0082] In addition, since a slip-out prevention structure is provided by engagement between the rubber protrusions 124 and the engagement holes 128 at four points in the circumferential direction, a greater slip-out prevention effect can be obtained compared to a case in which the structure is provided at only two points on the opposite side.

[0083] 22 shows an engine mount 140 for an automobile as a third embodiment of a fluid-filled vibration isolation device constructed according to the present invention. In the engine mount 140, a hook portion 148 provided on a cup member 146 is hooked onto and axially engaged with a rubber protrusion 144 serving as an engagement rubber that protrudes to the outer periphery from the press-fit rubber 42 of a mount body 142, thereby positioning the mount body 142 and the cup member 146 in the axial direction and preventing the mount body 142 from slipping out of the cup member 146.

[0084] The rubber protrusion 144 in this embodiment is provided to protrude in the front-rear direction on the short side portion of the second mounting member 18. The upper surface of the rubber protrusion 144 extends approximately 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-rear direction).

[0085] The hook portion 148 is provided protruding upward (toward the base end where the mount body 142 is inserted into the cup member 146) from the base body press-fit portion 58 of the cup member 146, and has a concave shape that opens inwardly in the front and rear directions in the vertical cross section shown in Fig. 22. One hook portion 148 is provided on each of a pair of short side portions of the cup member 146. Since the hook portion 148 is provided partially in the circumferential direction, it has a smaller deformation rigidity than the cylindrical base body press-fit portion 58, and is configured so that deformation such as tilting outwardly in the front and rear directions can occur 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, whereby the mount body 142 and the cup member 146 are connected to each other.

[0087] Additionally, hook portions 148 provided on cup member 146 are hooked onto rubber protrusions 144 provided on mount body 142, 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 restricted, and mount body 142 and cup member 146 are positioned relative to each other in the vertical direction, preventing separation due to coming off.

[0088] In this embodiment, the engaging portion of the cup member 146 that engages with the rubber protrusion 144 is configured by the hook portion 148. The hook portion 148 protrudes upward from the peripheral wall portion 52 of the cup member 146 and is provided partially on the circumference, so that when the rubber protrusion 144 passes over the top of the hook portion 148, the hook portion 148 is relatively easily pushed outward and opens outward. This makes it easy to hook the hook portion 148 onto the rubber protrusion 144 and engage it, facilitating the operation of connecting the mount main body 142 and the cup member 146.

[0089] Hook portion 148 is provided on a short side portion having greater deformation rigidity than a long side portion of peripheral wall portion 52 of cup member 146. This makes it possible to prevent hook portion 148 from becoming excessively open 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 FIG. 23, when the outer bracket 102 is attached to the engine mount 140, the hook portion 148 is separated 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 embodiment of the present invention has been described in detail above, the present invention is not limited to the specific description. For example, the rubber protrusions 44 and the engagement holes 60 may be formed on both the long side portion and the short side portion, or two may be provided on one long side portion or one short side portion. Similarly, the number and arrangement of the hook portions 148 are not limited.

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

[0093] In the first embodiment, a rubber protrusion 44 that protrudes further outward than the pressed-in rubber is exemplified as the engaging rubber, but for example, a step that is continuous partially or entirely in the circumferential direction may be provided on the outer circumferential surface of the pressed-in rubber 42 so that the hook portion 148 on the cup member 14 side is hooked onto the step to engage with it, in which case the engaging rubber is formed by the stepped portion of the pressed-in rubber 42.

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

[0095] 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 holes 24 Flange-shaped part 26 Fitting part 28 Crimping pin 30 Fixing part 32 Press-fitting cylinder 34 Recess 36 Rubber layer 38 Inner rubber 40 Seal rubber 42 Press-fit rubber 44 Rubber protrusion (engagement rubber) 46 Connecting part 48 Rib-like part 50 Rubber Fitting 52 Peripheral wall section 54 Bottom wall 56 Partition insert 58 Base press-fit part 60 Engagement hole 62 Through hole 64 Partitioning material 66 Flexible membrane 68 Partition member body 70 Lid fittings 72 Circumferential groove 74 Lower communication port 76 Storage Recess 78 Hollow recess 80 Central insertion part 82 Lower through hole 84 Movable Membrane 86 Insertion hole 88 Upper communication port 90 Upper hole 92 Holding part 94 Pressure receiving chamber (fluid chamber) 96 Equilibrium chamber (fluid chamber) 98 Orifice Passage 100 Inner bracket 102 Outer bracket 104 Volts 106 First fastening hole 108 Mount Containment Void 110 Fitting groove 112 Back wall 114 Pin insertion hole 115 Window 116 Mounting piece 117 Second fastening hole 118 Open hole 120 Engine mount (Second embodiment Fluid-filled vibration isolation device) 122 Mount body 124 Rubber protrusion (engagement rubber) 126 Cup member 128 Engagement hole 130 Corner 132 Curved Corner 140 Engine mount (third embodiment fluid-filled vibration isolation device) 142 Mount body 144 Rubber protrusion (engagement rubber) 146 Cup member 148 Hook part

Claims

1. 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 filled is formed, the second mounting member is annular and is press-fitted into the cup member via a press-fit rubber provided on an outer circumferential surface of the second mounting member, a seal rubber is provided on an insertion tip surface of the second mounting member into the cup member, and an axial space between the insertion tip surface of the second mounting member and the cup member is sealed by the seal rubber; An engaging rubber that is integral with the pressed-in 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 engagement between the engaging rubber and the cup member.

2. The engaging rubber is a rubber protrusion that protrudes outward from the press-fit rubber, 2. A fluid-filled vibration-damping device as described in claim 1, wherein the rubber protrusion is inserted perpendicular to the axis into an engagement hole penetrating the peripheral wall of the cup member, and the rubber protrusion engages with the inner peripheral surface of the engagement hole in the cup member in the axial direction.

3. The second mounting member is formed into a flattened ring shape having a long side and a short side when viewed in the axial direction, 3. A fluid-filled vibration isolation device according to claim 2, wherein said rubber projection is provided on a long side portion of said second mounting member.

4. The second mounting member is formed into a flattened ring shape having a long side and a short side when viewed in the axial direction, 4. A fluid-filled vibration-damping device according to claim 2 or 3, wherein the rubber projections are provided at corners of the second mounting member.

5. 3. A fluid-filled vibration-damping device as described in claim 1 or 2, wherein the cup member is provided with a hook portion that protrudes from a 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.

6. The cup member is formed into a flattened ring shape having a long side and a short side when viewed in the axial direction, 3. A fluid-filled type vibration-damping device according to claim 1, wherein the hook portion is provided on a short side portion of the cup member.

7. The engagement rubber protrudes to an outer periphery beyond the press-fit rubber, 3. A fluid-filled type vibration-damping device according to claim 1, wherein the engaging rubber is located closer to the insertion base end side than the center of the press-fit rubber in the insertion direction of the second mounting member.

Images