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 assembly positions.SOLUTION: In a fluid-filled vibration isolator 10, a first mounting member 16 and a second mounting member 18 are connected by a main body rubber elastic body 20 and fluid chambers 104, 106 filled with an incompressible fluid are formed. Further, the annular second mounting member 18 is rubber-press-fitted to a cup member 14 through press-fit rubber 46 provided on an outer peripheral surface. 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 48 provided on the insertion tip surface inserted to the cup member 14 in the second mounting member 18. The second mounting member 18 and the cup member 14 are positioned relative to each other in the axial direction by engagement between an engagement part 30 protruding to an outer periphery of the second mounting member 18 and a hook part 60 provided at the cup member 14.SELECTED DRAWING: Figure 1

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] In the first aspect, in a fluid-filled vibration-damping device having a fluid chamber in which a non-compressible fluid is sealed, a first mounting member and a second mounting member are connected by a main rubber elastic body, the annular second mounting member is rubber-pressed into a cup member via a pressed-in rubber provided on the outer circumferential surface, a seal rubber is provided on the insertion end face of the second mounting member into the cup member, and the axial space between the insertion end face of the second mounting member and the cup member is sealed by the seal rubber, the second mounting member is provided with an engagement portion that protrudes toward the outer periphery, and the second mounting member and the cup member are positioned relative to each other in the axial direction by engagement between the engagement portion of the second mounting member and a hook portion provided on the cup member.

[0009] In a fluid-filled vibration-damping device constructed in accordance with this embodiment, the second mounting member is held in an appropriate assembly position relative to the cup member by pressing the second mounting member into the cup member via the pressed-in rubber (rubber press-in) and engaging the hook portion of the cup member with the engaging portion of the second mounting member, thereby effectively sealing the gap between the second mounting member and the cup member with the sealing rubber.

[0010] The second mounting member pressed into the cup member is subjected to a force that causes it to come out of the cup member due to springback caused by the elasticity of the pressed-in rubber and sealing rubber, but the engagement between the engaging portion of the second mounting member and the hook portion of the cup member prevents the second mounting member from shifting in position relative to the cup member due to springback.

[0011] Since the second mounting member is rubber pressed into the cup member, the second mounting member and the cup member are positioned radially, making it difficult for the engaging portion of the second mounting member and the hook portion of the cup member to displace relatively from the engaged state, thereby preventing the generation of abnormal noise due to rubbing or hitting between the engaging portion and the hook portion.

[0012] In a second aspect, in the fluid-filled vibration-damping device described in the first aspect, at least a portion of the hook portion is provided in a position that overlaps with the pressed-in portion of the pressed-in rubber into the cup member in a direction perpendicular to the axis.

[0013] With a fluid-filled vibration-damping device constructed in accordance with this embodiment, it is possible to prevent the fluid-filled vibration-damping device from becoming too large in the axial direction, while ensuring the length of the hook portion so that the hook portion can easily engage with the engaging portion, and furthermore, it is possible to obtain a large press-fitting area of ​​the second mounting member relative to the cup member.

[0014] In a third aspect, in the fluid-filled vibration-damping device described in the first or second aspect, the base end of the hook portion extends from the cup member at a position farther from the opening of the cup member than the center of the rubber pressed into the cup member.

[0015] With a fluid-filled vibration-damping device constructed in accordance with this embodiment, it is possible to prevent the fluid-filled vibration-damping device from becoming too large in the axial direction, while ensuring a longer length for the hook portion, making it easier to engage the hook portion with the engaging portion, and furthermore, to obtain a larger press-fitting area for the second mounting member with the cup member.

[0016] A fourth aspect is a fluid-filled vibration-damping device described in any one of the first to third aspects, in which a bracket is attached to the second mounting member, and the second mounting member and the cup member are positioned relative to each other by the bracket, and when the bracket is attached to the second mounting member, the second mounting member and the cup member approach each other in the press-fitting direction, and the engagement portion and the hook portion are spaced apart from each other.

[0017] With a fluid-filled vibration isolation device constructed according to this embodiment, when the bracket is attached to the second mounting member, the engaging portion of the second mounting member and the hook portion of the cup member are spaced apart from each other, which more effectively prevents abnormal noise caused by direct contact between the second mounting member and the cup member, which are connected by rubber press-fitting. Also, because the second mounting member and the cup member are positioned by the bracket, the gap between the second mounting member and the cup member is stably maintained in a sealed state by the seal rubber. Effect of the Invention

[0018] According to the present invention, the second mounting member and the cup member can be stably held in an appropriate assembly position. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing an engine mount according to a first embodiment of the present invention; [Diagram 2] Right side view of the engine mount shown in Figure 1 [Diagram 3] Bottom view of the engine mount shown in Figure 1 [Figure 4] FIG. 4 is a vertical cross-sectional view of the engine mount shown in FIG. 1, which corresponds to the cross-section IV-IV of FIG. [Diagram 5] VV cross section of Figure 2 [Figure 6] Cross-sectional view of Fig. 2 taken along the line VI-VI [Figure 7] Cross-sectional view of Figure 2 taken along the line VII-VII [Figure 8] Sectional view of FIG. 2 taken along the line VIII-VIII [Figure 9] FIG. 2 is a perspective view of a mount body constituting the engine mount shown in FIG. 1. [Figure 10] A longitudinal cross-sectional view of the mount body shown in FIG. [Figure 11] FIG. 2 is a perspective view of a cup member constituting the engine mount shown in FIG. [Figure 12] FIG. 12 is a vertical cross-sectional view of the cup member shown in FIG. 11, which corresponds to the XII-XII cross-section of FIG. 13; [Figure 13] XIII-XIII sectional view of Figure 12 [Figure 14] Sectional view XIV-XIV of Fig. 12 [Figure 15] FIG. 2 is a perspective view showing a state in which a bracket is attached to the engine mount of FIG. [Figure 16] Right side view of the engine mount with the bracket attached as shown in Figure 15 [Figure 17] FIG. 17 is a vertical cross-sectional view of the engine mount in the bracket-attached state shown in FIG. 15, which corresponds to the cross-section XVII-XVII in FIG. 18. [Figure 18] Sectional view of XVIII-XVIII in FIG. [Figure 19] Section XIX-XIX of Fig. 16 [Figure 20] XX-XX cross section of Figure 19 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] 1 to 8 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. 9 and 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.

[0022] 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.

[0023] As shown in Fig. 8, the second mounting member 18 is a generally rounded rectangular tube with its corners curved in an arc, 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. As shown in Figs. 9 and 10, the second mounting member 18 has a flange-like portion 24 protruding from the upper end toward the outer periphery, and as shown in Fig. 10, fitting portions 26 extending linearly in the left-right direction are integrally formed on both the front and rear outer sides of the flange-like 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. Moreover, the second mounting member 18 has a larger diameter than the first mounting member 16 .

[0024] As shown in Figs. 6 and 10, the second mounting member 18 is integrally formed with an engagement protrusion 30 as an engagement portion. The engagement protrusion 30 is provided on the long side of the second mounting member 18 so as to protrude further outward to the left and right from the protruding tip surface of the flange-shaped portion 24. The upper surface of the engagement protrusion 30 is a first engagement surface 32 that spreads approximately perpendicular to the vertical direction, and the lower surface is a guide surface 34 that slopes downward and inward to the left and right. By providing these first engagement surface 32 and guide surface 34, the engagement protrusion 30 is formed into an approximately right-angled triangle in the vertical cross section shown in Figs. 6 and 10, and the width becomes narrower in the vertical direction toward the protruding tip. The first engagement surface 32 of the engagement protrusion 30 is located below the upper surface of the flange-shaped portion 24, and a step 35 is provided at the boundary between the first engagement surface 32 and the upper surface of the flange-shaped portion 24. The lower end of the guide surface 34 of the engaging projection 30 reaches approximately the same vertical position as the lower surface of the flange-like portion 24, and the guide surface 34 and the lower surface of the flange-like portion 24 are directly continuous with each other at an angle without any step. In this embodiment, as shown in Figures 7 and 9, two engaging projections 30, 30 are arranged on each long side portion of the second mounting member 18 at a predetermined distance from each other in the front-rear direction, and four engaging projections 30, 30, 30, 30 are provided on the circumference.

[0025] As shown in Fig. 10, the first mounting member 16 is disposed above the second mounting member 18 on approximately the same central axis, and a 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 thereto, 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 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 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 integrally formed upper portion with a fixing portion 36 that protrudes toward the inner circumference, and the inner diameter of the upper portion where the fixing portion 36 is provided is smaller than the inner diameter of the lower portion (press-fitted cylindrical portion 38) free from the fixing portion 36. The inner peripheral surface of the fixing portion 36 is tapered so that the diameter decreases downward.

[0026] A recess 40 that opens downward is formed in the main rubber elastic body 20. The recess 40 is shaped like an inverted cone with a smaller diameter toward the upper base side, and is located more inward than the fastening portion 36 of the second mounting member 18. By forming the recess 40, 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.

[0027] The press-fit tube portion 38, which is the lower portion of the second mounting member 18, is covered with a rubber layer 42 integrally formed with the main rubber elastic body 20. The rubber layer 42 is provided so as to cover the entire inner peripheral surface and the lower portion of the outer peripheral surface of the press-fit tube portion 38. The inner peripheral rubber 44 covering the inner peripheral surface of the press-fit tube portion 38 in the rubber layer 42 is thicker at the upper portion than at the lower portion, and the thicker outer peripheral portion of the upper portion is fixed to the lower surface of the fixing portion 36, and is integrally continuous with the main rubber elastic body 20 at the inner peripheral end portion of the upper portion. The portion of the rubber layer 42 covering the outer peripheral surface of the press-fit tube portion 38 is the press-fit rubber 46. The press-fit rubber 46 is formed so as to cover substantially the entire outer peripheral surface of the press-fit tube portion 38. The outer peripheral surface of the lower portion of the press-fit rubber 46 is tapered so as to become smaller in diameter downward.

[0028] The portion of the rubber layer 42 covering the lower surface of the press-fit tubular portion 38 is a seal rubber 48. The seal rubber 48 is formed continuously around the entire circumference with a tapered cross-sectional shape that narrows radially downward. The portion of the seal rubber 48 with the maximum protruding height is located at a position that overlaps with the lower surface of the press-fit tubular portion 38 when projected in the up-down direction. The maximum thickness (protruding height) of the seal rubber 48 is made larger than the thicknesses of the inner circumferential rubber 44 and the press-fit rubber 46.

[0029] 9, 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 inside. 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.

[0030] As shown in Figures 11 to 14, the cup member 14 is integrally provided with a peripheral wall portion 52 that is substantially in the shape of a rounded rectangular tube corresponding to the second mounting member 18, and a bottom wall portion 54 that is provided to cover the lower opening of the peripheral wall portion 52.

[0031] 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.

[0032] A hook portion 60 is provided on the base press-fit portion 58 of the cup member 14. In this embodiment, the hook portion 60 is provided on a long side portion of the base press-fit portion 58, and two hook portions 60, 60 are arranged at each long side portion apart from each other in the front-rear direction. Each hook portion 60 is integrally provided with a pair of support bases 62, 62 protruding from the base press-fit portion 58 to the outer periphery, an extension portion 64 extending upward from the protruding tip of each support base 62, and an engagement connecting portion 66 connecting the extending tips of the pair of extension portions 64, 64 to each other.

[0033] 13 and 14, the support base 62 in this embodiment has a curved lower surface in an arc shape, and the base press-fit portion 58 side is thicker in the vertical direction, ensuring the strength of the connection portion with the base press-fit portion 58. The support base 62 protrudes outward at a lower side farther from the opening (upper end) of the peripheral wall portion 52 than the vertical center of the base press-fit portion 58 into which the second mounting member 18 is rubber-pressed through the press-fit rubber 46, and in this embodiment, protrudes outward at the lower end of the base press-fit portion 58. A pair of support bases 62, 62 constituting one hook portion 60 are provided in parallel, separated from each other by a predetermined distance in the front-rear direction.

[0034] The extension portion 64 is plate-like or rod-like extending linearly in the vertical direction, and its lower end is integrally continuous with the support base 62. The lower portion of the extension portion 64 is provided at a position overlapping the base body press-fit portion 58 in the left-right direction, and is disposed opposite the base body press-fit portion 58 in the left-right direction, and its upper portion is located above the base body press-fit portion 58. More than half of the extension portion 64 in the vertical direction protrudes above the base body press-fit portion 58. In other words, the upper end of the base body press-fit portion 58 is located below the vertical center of the extension portion 64.

[0035] The engaging connection part 66 extends in a direction substantially perpendicular to the up-down direction (front-rear direction), and both front and rear ends are integrally connected to each of the pair of extending parts 64, 64, and connect the tips of the pair of extending parts 64, 64 to each other. The central part of the engaging connection part 66 located between the pair of extending parts 64, 64 has a second engaging surface 68 having a flat lower surface that extends in the direction substantially perpendicular to the up-down direction. The upper parts of the left and right inner surfaces of the engaging connection part 66 are guide surfaces 70 that incline upward and outward to the left and right. The upper surface of the engaging connection part 66 is formed of a curved convex surface that connects the guide surfaces 70 to the left and right outer surfaces.

[0036] A through hole 72 that penetrates in the up-down direction is formed in the bottom wall portion 54 of the cup member 14. By forming this through hole 72, 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.

[0037] The cup member 14 is a hard member, but it is desirable that radial bending deformation, particularly in the hook portion 60, be allowed to a certain extent. Although the cup member 14 may be made of metal, it is preferably formed of a hard synthetic resin (including fiber-reinforced synthetic resin).

[0038] 4 to 6, the press-fit tubular portion 38 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 46 of the rubber layer 42 is compressed between the outer peripheral surface of the press-fit tubular portion 38 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 38 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 46.

[0039] The gap between the press-fit tube portion 38 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 48, which is a part of the rubber layer 42, and the press-fit rubber 46. That is, the seal rubber 48 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 38 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 38 and the partition insertion portion 56. The press-fit rubber 46 is compressed between the radially opposing surfaces of the outer circumferential surface of the press-fit tube portion 38 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 38 and the base press-fit portion 58.

[0040] 2, 3, and 6, each of the engagement projections 30 of the second mounting member 18 is inserted into the inner periphery of each of the hook portions 60 of the cup member 14. As shown in FIG. 6, the first engagement surface 32 of the engagement projection 30 is overlapped with the second engagement surface 68 of the hook portion 60 in the vertical direction, so that the engagement projection 30 and the hook portion 60 are engaged 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-fitted state of the press-fitted tube portion 38 into the base press-fitted portion 58 via the press-fitted rubber 46 is stably maintained, so that the rubber layer 42 (seal rubber 48 and press-fitted rubber 46) keeps the space between the second mounting member 18 and the cup member 14 in a stable sealed state.

[0041] The seal rubber 48 covering the lower surface of the press-fit tubular portion 38 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 48 is compressed in the vertical direction between the press-fit tubular portion 38 and the partition insertion portion 56, so that a disengagement force due to the elasticity of the seal rubber 48 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 engagement projection 30 and the hook portion 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 48 is effectively prevented.

[0042] In addition, because the press-fit tubular portion 38 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 46, a pull-out force caused by the elastic restoring force of the press-fit rubber 46 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 engagement between the engaging projection 30 and the hook portion 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 46 is also prevented.

[0043] When transporting the engine mount 10 in a standalone state without the outer bracket 112 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 engagement between the engagement protrusion 30 and the hook portion 60 more reliably prevents separation of the mount body 12 and the cup member 14 and maintains the sealing performance, making it easier to manage the engine mount 10 during storage, transportation, etc.

[0044] The engaging protrusion 30 is inserted into the inner circumference of the hook portion 60 (below the engaging connection portion 66) by climbing over the engaging connection portion 66 of the hook portion 60 from above downward. In this embodiment, the lower surface of the engaging protrusion 30 is a guide surface 34 formed by an inclined surface, and when the engaging protrusion 30 is pushed downward with the engaging connection portion 66 in contact with the guide surface 34, a force acts on the engaging connection portion 66 of the hook portion 60 in a direction to push it outward to the left and right. Therefore, by a simple assembly operation of bringing the mount main body 12 and the cup member 14 close to each other, the engaging protrusion 30 easily climbs over the engaging connection portion 66 of the hook portion 60 and engages with the engaging connection portion 66. In particular, in this embodiment, a guide surface 70 is provided on the upper part of the left and right inner surfaces of the engaging connection portion 66, and the engaging protrusion 30 is pressed against the guide surface 70, so that the engaging connection portion 66 is pushed open in the left and right direction, and therefore the engaging protrusion 30 and the engaging connection portion 66 can be more easily engaged with each other.

[0045] The hook portion 60 has a lower end connected to the vertical middle portion of the peripheral wall portion 52 of the cup member 14, and is disposed so that a lower portion of the extension portion 64 of the hook portion 60 overlaps in the left-right direction with the base press-fit portion 58 of the peripheral wall portion 52. This makes it possible to ensure a large length dimension of the extension portion 64 of the hook portion 60 while ensuring an allowance for the rubber to be press-fitted into the cup member 14 of the second mounting member 18, as compared with a structure in which the hook portion 60 is provided so as to protrude from the upper end of the peripheral wall portion 52. As a result, when the engaging projection 30 gets over the engaging connecting portion 66 of the hook portion 60, deformation of the hook portion 60 is easily permitted, and the engaging projection 30 can get over the engaging connecting portion 66 with less force, and damage to the hook portion 60 is easily avoided.

[0046] The connection position of the hook portion 60 with respect to the peripheral wall portion 52 of the cup member 14 is set below the vertical center of the base press-fit portion 58, which is the portion where the second mounting member 18 is rubber press-fitted, and the rubber press-fit allowance and the length of the extension portion 64 of the hook portion 60 are each effectively ensured. Particularly in this embodiment, the support base 62 of the hook portion 60 is connected to the lower end of the base press-fit portion 58 of the cup member 14, thereby ensuring a larger rubber press-fit allowance and the length of the extension portion 64.

[0047] Since a step 35 is provided between the upper surface (first engagement surface 32) of the engagement protrusion 30 and the upper surface of the flange-shaped portion 24, it is possible to easily check by visual inspection, etc. whether the engagement position of the hook portion 60 with respect to the engagement protrusion 30 is appropriate.

[0048] In addition, the engaging projection 30 is provided on the long side portion of the second mounting member 18, and the hook portion 60 that engages with the engaging projection 30 is formed on the long side portion of the cup member 14. This makes it possible to prevent interference between the pair of fitting portions 26, 26 of the second mounting member 18 and each of the hook portions 60.

[0049] A partition member 74 and a flexible membrane 76 are disposed between the mount main body 12 and cup member 14 thus assembled, thereby forming the engine mount 10. As shown in Figures 4 to 6 and 8, the partition member 74 is shaped as a whole in a generally rectangular plate shape with rounded corners, and has a structure in which a cover fitting 80 is superimposed on and fixed to the upper surface of a partition member main body 78.

[0050] The partition member main body 78 is generally in the form of a thick plate, and a circumferential groove 82 is formed around the outer periphery of the partition member main body 78, extending in the circumferential direction and opening on the upper surface. The circumferential groove 82 extends in the circumferential direction for a length less than one revolution, and as shown in FIG. 5, a lower communication port 84 is formed at one circumferential end portion thereof, penetrating the bottom wall portion. In addition, a storage recess 86 opening on the upper surface and a lightening recess 88 opening on the lower surface are formed on the inner circumferential side of the circumferential groove 82 in the partition member main body 78. A columnar central insertion portion 90 protruding upward from the bottom wall portion is provided in the central portion of the storage recess 86. A plurality of lower through holes 92 penetrating in the vertical direction are formed in the bottom wall portion of the storage recess 86.

[0051] A movable membrane 94 is accommodated in the accommodation recess 86. The movable membrane 94 is formed of a rubber elastic body, and has a generally rounded rectangular plate shape corresponding to the accommodation recess 86. An insertion hole 96 penetrating in the vertical direction is formed in the central part of the movable membrane 94, and when accommodated in the accommodation recess 86, the central insertion part 90 of the partition member main body 78 is inserted into the insertion hole 96, thereby positioning the movable membrane 94 within the accommodation recess 86. The movable membrane 94 has thick walls at its outer circumferential end and around the insertion hole 96, and a radially intermediate part is thinner than these.

[0052] A lid fitting 80 is superimposed on the upper surface of the partition member main body 78. The lid fitting 80 is in the form of a flat plate with rounded rectangular corners corresponding to the partition member main body 78 when viewed in the vertical direction, and is made of a metal such as an aluminum alloy or stainless steel. The lid fitting 80 has an upper communication port 98 that penetrates the outer circumferential end in the vertical direction as shown in Fig. 4, and also has a plurality of upper through holes 100 that penetrate the inner circumferential portion in the vertical direction as shown in Fig. 6.

[0053] As shown in Figs. 4 to 6, the cover fitting 80 is fixed to the partition member main body 78 in a state where it is superimposed on the upper surface of the partition member main body 78, and the partition member 74 is constituted by the partition member main body 78, the movable membrane 94, and the cover fitting 80. By superimposing the cover fitting 80 on the partition member main body 78, the upper opening of the circumferential groove 82 is covered by the cover fitting 80 to form a tunnel-like passage. In addition, the upper opening of the accommodation recess 86 is covered by the cover fitting 80 to form a void, and the movable membrane 94 is accommodated in this void. The thick-walled inner and outer circumferential ends of the movable membrane 94 are compressed in the vertical direction between the bottom wall portion of the accommodation recess 86 in the partition member main body 78 and the cover fitting 80, and the upper surface of the thin-walled radially middle portion is spaced downward from the cover fitting 80.

[0054] The partition member 74 has an upper portion inserted into the press-fit tubular portion 38 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 78 is fitted into the press-fit tubular portion 38 of the second mounting member 18 via the inner circumferential rubber 44, and is also fitted into the partition insertion portion 56 of the cup member 14, thereby positioning the partition member 74 with respect to the mount main body 12 and the cup member 14. Note that, as shown in an enlarged view in Figure 6, in the state in which the engine mount 10 is in a standalone state before the outer bracket 112 is attached, the outer circumferential end portion of the cover fitting 80 is spaced downward from the portion of the inner circumferential rubber 44 that covers the underside of the fixing portion 36.

[0055] A flexible film 76 is disposed below the partition member 74. The flexible film 76 is formed of rubber or resin elastomer, has a thin dome shape, and has flexibility that allows bending deformation in the thickness direction. A relatively thick annular holding portion 102 is provided at the outer peripheral end of the flexible film 76. The holding portion 102 is sandwiched in the vertical direction over the entire circumference between the partition member main body 78 and the bottom wall portion 54 of the cup member 14, so that the flexible film 76 is disposed so as to cover the lower part of the partition member 74. The thin inner peripheral portion of the flexible film 76 is exposed downward through the through hole 72 of the bottom wall portion 54 of the cup member 14, and the through hole 72 allows deformation such as downward bulging.

[0056] Between the mount body 12 and the partition member 74, a pressure-receiving chamber 104 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 74 and the flexible membrane 76, an equilibrium chamber 106 is formed as a fluid chamber, the wall of which is partly formed by the flexible membrane 76, and in which volume change is permitted. The pressure-receiving chamber 104 and the equilibrium chamber 106 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 42 including the seal rubber 48, and the gap between the cup member 14 and the partition member 74 is sealed by the retaining portion 102 of the flexible membrane 76, preventing leakage of the incompressible fluid filled therein.

[0057] The circumferential groove 82 of the partition member 74 communicates with the pressure-receiving chamber 104 through the upper communication port 98 and with the equilibrium chamber 106 through the lower communication port 84, and an orifice passage 108 that communicates between the pressure-receiving chamber 104 and the equilibrium chamber 106 is formed by the circumferential groove 82 and the upper and lower communication ports 98, 84. The tuning frequency of the orifice passage 108, which is the resonant frequency of the flowing fluid, is set to the frequency of the vibration to be damped, for example, it is tuned to the frequency of low-frequency vibration such as engine shake.

[0058] The upper surface of the movable membrane 94 of the partition member 74 is subjected to the liquid pressure of the pressure-receiving chamber 104 through the upper through hole 100, and the lower surface of the movable membrane 94 is subjected to the liquid pressure of the equilibrium chamber 106 through the lower through hole 92. When the relative pressure between the pressure-receiving chamber 104 and the equilibrium chamber 106 varies, the radial middle portion of the movable membrane 94 deforms vertically, thereby achieving the function of transmitting liquid pressure between the pressure-receiving chamber 104 and the equilibrium chamber 106.

[0059] As shown in Figs. 15 to 20, an inner bracket 110 and an outer bracket 112 as a bracket are attached to the engine mount 10. The inner bracket 110 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 110 in this embodiment is fixed to the first attachment member 16 by a bolt 114 screwed into the screw hole 22. In addition, the left end portion of the inner bracket 110 attached to the power unit is wide in the front-rear direction, and a plurality of first fastening holes 116 are formed penetrating the inner bracket 110 in the up-down direction. The inner bracket 110 is preferably formed of a metal such as iron, and is a highly rigid member.

[0060] The outer bracket 112 has a mount receiving space 118 into which the engine mount 10 is inserted and assembled. The mount receiving space 118 is recessed and opens to the right, and has a pair of fitting grooves 120, 120 that open to the inner wall surfaces on both the front and rear sides. As shown in FIG. 19, the fitting groove 120 extends linearly in the left-right direction, and in this embodiment, the vertical dimension increases toward the right. The fitting groove 120 reaches the right end of the outer bracket 112 and opens to the right, but does not reach the left end. A back wall portion 122 is provided to the left of the fitting groove 120. A pin insertion hole 124 corresponding to the crimping pin 28 of the second mounting member 18 is formed penetrating the back wall portion 122 in the left-right direction.

[0061] As shown in Fig. 18, a window 126 is formed in the left wall of the mount accommodating cavity 118 in the outer bracket 112, penetrating the upper part in the left-right direction. The outer bracket 112 is provided with a pair of attachment pieces 128, 116 that protrude toward both the front and rear at the lower end. Each attachment piece 128 is formed with a second fastening hole 130 that penetrates in the vertical direction, as shown in Figs. 15 and 17. As shown in Figs. 17 and 18, an open hole 132 that penetrates in the vertical direction is formed in the lower wall of the mount accommodating cavity 118 in the outer bracket 112, and the open hole 132 allows downward deformation of the flexible membrane 76.

[0062] The outer bracket 112 is attached to the second mounting member 18 side of the engine mount 10. That is, as shown in Figures 19 and 20, the front and rear fitting portions 26, 26 of the second mounting member 18 are fitted into the front and rear fitting grooves 120, 120 of the mount accommodating cavity 118 of the outer bracket 112, 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 118, thereby attaching the outer bracket 112 to the second mounting member 18 side of the engine mount 10. When the outer bracket 112 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 112.

[0063] As shown in FIG. 19, the fitting groove 120 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 120 toward the left side, making it easy to insert the fitting portion 26 into the fitting groove 120. As shown in FIG. 19, the fitting portion 26 has a vertical dimension that is smaller than that of the fitting groove 120, and is not sandwiched between the upper and lower inner surfaces of the fitting groove 120. The upper and lower inner surfaces of the fitting groove 120 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 120 via the fitting rubber 50, as shown in FIG. 20. In short, the fitting portion 26 is in a rubber press-fit state in which it is fitted into the fitting groove 120 via the fitting rubber 50.

[0064] 19 and 20, with the fitting portion 26 fitted into the fitting groove 120, the crimping pin 28 protruding from the left end surface of the fitting portion 26 is inserted into a pin insertion hole 124 formed in a rear wall portion 122 of the fitting groove 120. Then, by applying an axial (left-right) compressive force to the crimping pin 28 inserted into the pin insertion hole 124 to crush the tip portion of the crimping pin 28, the tip portion of the crimping pin 28 is expanded in diameter and deformed, and is crimped and fixed to the inner circumferential surface of the opening portion of the pin insertion hole 124. This prevents the fitting portion 26 from displacing to the right with respect to the outer bracket 112, and prevents the fitting portion 26 from coming off to the right from the fitting groove 120, thereby preventing separation of the engine mount 10 and the outer bracket 112.

[0065] When the outer bracket 112 is attached to the engine mount 10, the inner bracket 110 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 112 through the window portion 126 of the outer bracket 112, as shown in FIG. 18.

[0066] 17 and 18, by attaching the outer bracket 112 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 38 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 48 is compressed more greatly between the press-fit tubular portion 38 and the upper surface of the partition insertion portion 56, thereby improving the sealing performance of the seal rubber 48 between the second mounting member 18 and the cup member 14.

[0067] 18, by attaching the outer bracket 112 to the engine mount 10, the inner circumferential rubber 44 covering the underside of the fixing portion 36 of the second mounting member 18 is pressed liquid-tight against the upper surface of the partition member 74, preventing a short circuit between the pressure-receiving chamber 104 and the equilibrium chamber 106 through the outer circumferential side of the partition member 74. By pressing the fixing portion 36 against the partition member 74 via the inner circumferential rubber 44, the retaining portion 102 of the flexible membrane 76 is more firmly sandwiched between the underside of the partition member 74 and the bottom wall portion 54 of the cup member 14, thereby improving the sealing performance of the retaining portion 102.

[0068] As described above, the engine mount 10 alone, without the outer bracket 112 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 112 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 104 and the equilibrium chamber 106 are prevented.

[0069] 18, when the outer bracket 112 is attached to the engine mount 10, the first engagement surface 32 of the engagement protrusion 30 and the second engagement surface 68 of the hook portion 60 are spaced apart from each other in the vertical direction. This makes it possible to prevent the first engagement surface 32 of the engagement protrusion 30 and the second engagement surface 68 of the hook portion 60 from rubbing against each other due to the action of an external force, which would cause abnormal noise, for example, when the engine mount 10 is attached to a vehicle and used. Even if the engagement between the engagement protrusion 30 and the hook portion 60 is released, the mount main body 12 and the cup member 14 are positioned in the vertical direction by the outer bracket 112, and separation between the mount main body 12 and the cup member 14 is prevented.

[0070] 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 110 and attaching the second mounting member 18 to the vehicle body via an outer bracket 112. 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 and the like is exerted. That is, when low-frequency vibration equivalent to engine shake is input, a relative pressure fluctuation between the pressure-receiving chamber 104 and the equilibrium chamber 106 causes a fluid flow between the two chambers 104, 106 through the orifice passage 108, and a vibration-damping effect (high damping effect) based on the flow action of fluid is exerted. In addition, when medium to high frequency vibrations such as idling vibrations or driving noise are input, the deformation of the movable membrane 94 causes hydraulic pressure to be transmitted between the two chambers 104, 106, thereby preventing the pressure-receiving chamber 104 from essentially sealing off and becoming a high dynamic spring, and a vibration-damping effect (vibration isolation effect) is achieved by the low dynamic spring.

[0071] Although the embodiment of the present invention has been described in detail above, the present invention is not limited by the specific description. For example, the number of the engagement projections 30 and the hook portions 60 is not limited. In addition, the arrangement of the engagement projections 30 and the hook portions 60 in the circumferential direction is not particularly limited, but it is preferable that they are provided at least on both sides facing each other in the radial direction in order to stably exert the engagement state.

[0072] The structure of the cup member 14 side that engages with the engaging protrusion 30 of the second mounting member 18 side is not necessarily limited to the hook portion 60 having a pair of support bases 62, 62, a pair of extending portions 64, 64, and an engaging connecting portion 66 shown in the first embodiment. Specifically, for example, the hook portion may have one support base 62 and one extending portion 64, and the tip portion of the extending portion 64 may be formed into a concave shape that opens toward the inside in the left-right direction, and the engaging protrusion 30 may be inserted into the concave portion to engage in the axial direction. In addition, the tip portion of the hook portion may be hooked on the flange-shaped portion 24 of the second mounting member 18 to engage in the axial direction, in which case the engaging portion is composed of the flange-shaped portion 24. As can be seen from this structural example, the engaging portion should not be interpreted as being limited to the engaging protrusion 30 shown in the first embodiment, but may be any structure that is provided on the second mounting member 18 so as to protrude toward the outer periphery and engage with the hook portion 60 of the cup member 14.

[0073] 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 cup member 14 connected, it is in a temporary sealed state sufficient to prevent liquid leakage to the outside, and when the outer bracket 112 is attached to the engine mount 10, it becomes in a fully sealed state when in use. However, for example, the amount of compressive deformation of the sealing rubber 48, etc. can also be set so that the fully sealed state is achieved when the engine mount 10 is in a standalone state.

[0074] As shown in the first embodiment, it is desirable for the engagement between the engaging protrusion 30 and the hook portion 60 to be released when the outer bracket 112 is attached to the engine mount 10, but the engagement between the engaging protrusion 30 and the hook portion 60 may be maintained when the outer bracket 112 is attached.

[0075] 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]

[0076] 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 Engagement protrusion (engagement part) 32 First engagement surface 34 Guide Surface 35 steps 36 Fixation part 38 Press-fitting cylinder 40 Recess 42 Rubber layer 44 Inner rubber 46 Press-fit rubber 48 Seal Rubber 50 Rubber Fitting 52 Peripheral wall section 54 Bottom wall 56 Partition insert 58 Base press-fit part 60 Hook part 62 Support base 64 Extension 66 Engagement connection part 68 Second engagement surface 70 Guide surface 72 Through hole 74 Partitioning material 76 Flexible membrane 78 Partition member body 80 Lid fittings 82 Circumferential groove 84 Lower communication port 86 Storage Recess 88 Hollow recess 90 Central insertion part 92 Lower hole 94 Movable Membrane 96 Insertion hole 98 Upper communication port 100 Upper hole 102 Holding part 104 Pressure receiving chamber (fluid chamber) 106 Equilibrium chamber (fluid chamber) 108 Orifice Passage 110 Inner bracket 112 Outer bracket (bracket) 114 Volts 116 First fastening hole 118 Mount Containment Void 120 Fitting groove 122 Back wall 124 Pin insertion hole 126 Window 128 Mounting piece 130 Second fastening hole 132 Open hole

Claims

1. A fluid-filled vibration-damping device having a first mounting member and a second mounting member connected by a main rubber elastic body and having a fluid chamber filled with a non-compressible fluid, 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; The second mounting member is provided with an engagement portion protruding toward the outer periphery, and the second mounting member and the cup member are positioned relative to each other in the axial direction by engagement between the engagement portion of the second mounting member and a hook portion provided on the cup member.

2. 2. The fluid-filled vibration-proof device according to claim 1, wherein at least a part of the hook portion is provided at a position that overlaps a part of the press-fit rubber pressed into the cup member in a direction perpendicular to the axis.

3. 3. A fluid-filled vibration-damping device according to claim 1 or 2, wherein a base end of the hook portion extends from the cup member at a position farther from an opening of the cup member than a center of a rubber press-fitted portion of the pressed-in rubber into the cup member.

4. a bracket is attached to the second mounting member, and the second mounting member and the cup member are positioned relative to each other by the bracket; 3. A fluid-filled vibration-damping device as described in claim 1 or 2, wherein when the bracket is attached to the second mounting member, the second mounting member and the cup member approach each other in the press-fitting direction, and the engagement portion and the hook portion are spaced apart from each other.

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