Vibration isolation device and method for manufacturing the same

Abstract

To provide a vibration control device capable of suppressing the generation of burring with a further simple structure, and eliminating the need of or simplifying deburring work.SOLUTION: A vibration control device comprises: an inner 10; a cylindrical outer 20 disposed on the outer side in a radial direction of the inner 10; an elastic body 30 coupling the inner 10 and the outer 20; and a retainer 50 arranged in at least one end portion of the inner 10 in an axial direction, and having an opening portion 51 penetrating in the axial direction. The inner 10 comprises a plurality of annular projecting portions 12 extending outward in the axial direction from at least one end surface 15 in the axial direction, and inserted in the opening portion 51 of the retainer 50. The annular projecting portion 12 comprises a plurality of caulking fixing portions 13 disposed at intervals in a circumferential direction. The retainer 50 has the plurality of caulking fixing portions 13 pressed against an inner peripheral surface 52 of the opening portion 51 to be caulked and fixed to the inner 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an anti-vibration device and a method for manufacturing an anti-vibration device. [Background technology]

[0002] Conventionally, a bushing assembly has been known as a vibration-proof device, which includes an outer tube, an inner tube, a main rubber body connecting the inner peripheral surface of the outer tube with the outer peripheral surface of the inner tube, and a retainer disposed at both axial ends of the inner tube, the retainer having a crimped portion fixed to the end of the inner tube. For example, one such device is described in Japanese Utility Model Laid-Open Publication No. 60-122035 (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 60-122035 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the bushing assembly of Patent Document 1, a crimping structure using a crimping tool is adopted to fix the retainer to the end of the inner cylinder. That is, a cylindrical crimping portion provided at the axial end of the inner cylinder is inserted into an opening penetrating the retainer, and the crimping portion, which has been expanded in diameter by pressing the crimping tool into the inner circumference, is crimped and fixed to the inner circumferential surface of the retainer. However, during such crimping, the inner circumferential surface of the inner cylinder (crimping portion) is scraped off by the crimping tool, generating burrs on the inner circumferential surface of the inner cylinder, which causes assembly failures and time-consuming burr removal work, resulting in problems with assembly accuracy and increased costs.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide an anti-vibration device having a simpler configuration, capable of suppressing the generation of burrs, and making burr removal work unnecessary or simplified, and a method for manufacturing the same. [Means for solving the problem]

[0006] In order to achieve the above object, a vibration-proof device according to a first aspect of the present invention comprises an inner, a cylindrical outer arranged radially outward of the inner, an elastic body connecting the inner and the outer, and a retainer arranged at at least one end in the axial direction of the inner and having an opening penetrating in the axial direction, the inner comprises an annular protruding portion extending axially outward from at least one end face in the axial direction and inserted into the opening of the retainer, the annular protruding portion comprises a plurality of crimping fixing portions arranged spaced apart from each other in the circumferential direction, and the retainer is crimped and fixed to the inner by pressing the plurality of crimping fixing portions against an inner peripheral surface of the opening. On the other hand, the annular protrusion includes a plurality of connecting portions that are located between the plurality of crimped fixing portions in the circumferential direction and connect the plurality of crimped fixing portions in the circumferential direction, and the retainer is fixed to the inner member in a state in which the plurality of connecting portions have gaps between them and the inner peripheral surface of the opening. .

[0007] According to the first aspect, by providing a plurality of crimping portions at the protruding portion of the inner member at a distance from each other in the circumferential direction, when the crimping portions of the inner member are pressed against the inner peripheral surface of the retainer and crimped, burrs generated on the inner peripheral surface of the inner member (the protruding portion) are suppressed compared to when the entire circumference is crimped. Therefore, the burrs can be easily removed, or the burr removal work is not required. In addition, because the connecting portions provided between the multiple crimped fixing portions in the circumferential direction have gaps between them and the retainer, the gaps allow the crimped fixing portions to deform in the circumferential direction when the crimped fixing portions are pressed against the inner peripheral surface of the opening of the retainer and crimped. Therefore, when the crimped fixing portions are expanded toward the outer periphery and crimped, burrs are unlikely to occur on the inner peripheral surface of the crimped fixing portions.

[0010] No. two The embodiment is First In the vibration-damping device described in the aspect, the annular protrusion has a plurality of connecting portions located circumferentially between the plurality of crimped fixing portions and connecting each of the plurality of crimped fixing portions circumferentially, and the retainer is fixed to the inner with the plurality of connecting portions abutting the inner surface of the opening.

[0011] No. two According to this aspect, by the connecting portion abutting against the inner peripheral surface of the retainer, for example, a supplementary fixing force can be applied between the connecting portion and the retainer, improving the fixing strength between the inner member and the retainer. Also, it is possible to prevent the intrusion of foreign matter such as water through the gap between the connecting portion and the retainer.

[0012] No. three The embodiment is one Or two In the vibration-isolating device according to the aspect, the radial thickness of the connecting portion is greater than the radial thickness of the crimped fixing portion.

[0013] No. three According to this aspect, if the connecting portion is radially thicker than the crimped fixing portion when the inner and retainer are crimped and fixed, circumferential elongation deformation (movement of forming material) occurs from the crimped fixing portion to the connecting portion during crimping, and the generation of burrs due to excessive compression of the crimped fixing portion between the crimping jig and the retainer is suppressed.

[0014] No. four The embodiment is one ~ three In the vibration-proof device according to any one of the above aspects, the circumferential length of each of the crimped fixing portions is longer than the circumferential length of each of the connecting portions.

[0015] No. four According to the above aspect, the circumferential length of the area where the inner and the retainer are crimped and fixed by the crimping portion is increased, improving the fixing strength between the inner and the retainer. Also, by crimping the inner and the retainer over a wide range in the circumferential direction, the inner and the retainer are less likely to be inclined or misaligned relative to each other when fixed, and the inner and the retainer can be assembled stably.

[0016] No. Five Aspects of The vibration-proof device according to the present invention comprises an inner, a cylindrical outer arranged radially outward of the inner, an elastic body connecting the inner and the outer, and a retainer arranged at at least one end in the axial direction of the inner and having an opening penetrating in the axial direction, the inner having an annular protrusion extending axially outward from at least one end face in the axial direction and inserted into the opening of the retainer, the annular protrusion having a plurality of crimp fixing portions arranged spaced apart from each other in the circumferential direction, the retainer being crimped and fixed to the inner by the plurality of crimp fixing portions being pressed against an inner peripheral surface of the opening, The hardness of the material of the inner member is smaller than the hardness of the material of the retainer.

[0017] No. Five According to the embodiment, By providing a plurality of crimping portions at the protruding portion of the inner member at intervals in the circumferential direction, when the crimping portions of the inner member are pressed against the inner peripheral surface of the retainer and crimped, burrs on the inner peripheral surface of the inner member (the protruding portion) are suppressed compared to when the entire circumference is crimped. Therefore, burrs can be easily removed, or the burr removal work is not required. Also,Even if the material hardness of the inner, which is prone to burrs, is lower than the material hardness of the retainer, the inner and retainer can be crimped and fixed together using a plurality of crimping fixing parts arranged at a distance from each other in the circumferential direction, thereby making it possible to effectively fix the inner and retainer together while suppressing the generation of burrs on the inner due to significant deformation of the inner, which has a lower material hardness.

[0018] No. Six The first to fourth aspects are Five In the vibration-proof device according to any one of the above aspects, the plurality of crimped fixing portions are evenly arranged in the circumferential direction.

[0019] No. Six According to this aspect, the fixing force of the crimped fixing portion acts in a well-balanced manner in the circumferential direction, so that the inner member and the retainer are stably fixed to each other. In addition, it is possible to prevent the protruding portion from becoming distorted in shape after the crimping.

[0020] No. seven The first to third aspects are as follows: Six In the vibration-damping device described in any one of the above aspects, the axial end face of the inner is abutted against the opening peripheral portion of the opening in the retainer, the annular protrusion protruding from the axial end face of the inner is inserted into the opening of the retainer, and the inner surface of the opening of the retainer has a step portion that partially protrudes toward the inner circumference on the abutting side of the inner, and the crimped fixing portion of the protrusion is engaged with the step portion in the axial direction.

[0021] No. sevenAccording to this aspect, the crimped fixing portion of the inner is engaged with the step portion of the retainer in the axial direction, so that a large resistance force against the protruding portion coming out of the opening of the retainer is exerted, and it is possible to prevent the inner and the retainer from being separated in the axial direction. Moreover, because the step portion is partially provided on the inner circumferential surface of the opening of the retainer on the abutting side of the inner, it is possible to engage the crimped fixing portion with the step portion without the crimped fixing portion protruding significantly from the opening of the retainer, and for example, it is also possible to engage the crimped fixing portion with the step portion while being accommodated in the inner circumferential surface of the opening of the retainer.

[0022] No. eight Aspects of The vibration-proof device according to the present invention comprises an inner, a cylindrical outer arranged radially outward of the inner, an elastic body connecting the inner and the outer, and a retainer arranged at at least one end in an axial direction of the inner and having an opening penetrating in the axial direction, the inner having an annular protruding portion extending axially outward from at least one end face in the axial direction and inserted into the opening of the retainer, the annular protruding portion having a plurality of crimping fixing portions arranged at a distance from each other in a circumferential direction, the retainer having a plurality of front ends. the crimping fixing portion is pressed against an inner peripheral surface of the opening and crimped and fixed to the inner, while an axial end face of the inner is abutted against an opening periphery of the opening in the retainer, the annular protruding portion protruding from the axial end face of the inner is inserted into the opening of the retainer, and the inner peripheral surface of the opening of the retainer has a stepped portion that partially protrudes inward on the abutting side of the inner, and the crimping fixing portion of the protruding portion is engaged with the stepped portion in the axial direction, The annular protrusion has a plurality of connecting portions located circumferentially between the plurality of crimped fixing portions and connecting each of the plurality of crimped fixing portions circumferentially, and the connecting portions abut the inner surface of the opening at the step portion of the retainer, and have a gap separated from the inner surface of the opening in a portion of the retainer outside the step portion.

[0023] No. eight According to the embodiment, By providing a plurality of crimping portions at the protruding portion of the inner member at intervals in the circumferential direction, when the crimping portions of the inner member are pressed against the inner peripheral surface of the retainer and crimped, burrs on the inner peripheral surface of the inner member (the protruding portion) are suppressed compared to when the entire circumference is crimped. Therefore, burrs can be easily removed, or the burr removal work is not required. In addition, because the crimped fixing portion of the inner is engaged with the step portion of the retainer in the axial direction, a large resistance force is exerted against the protruding portion coming out of the opening of the retainer, and it is possible to prevent the inner and the retainer from being separated in the axial direction. Moreover, because the step portion is partially provided on the inner circumferential surface of the opening of the retainer on the abutting side of the inner, it is possible to engage the crimped fixing portion with the step portion without the crimped fixing portion protruding significantly from the opening of the retainer, and for example, it is also possible to engage the crimped fixing portion with the step portion while being accommodated in the inner circumferential surface of the opening of the retainer. moreover, By abutting the connecting portion against the step, the connecting portion can obtain a supplementary fixing force between the inner and the retainer. Also, since the connecting portion is separated from the step portion and has a gap from the inner peripheral surface of the opening, the connecting portion suppresses the generation of burrs on the crimped fixing portion when the inner and the retainer are crimped.

[0024] The present invention NineThe manufacturing method of the vibration-proof device according to the aspect is a manufacturing method of a vibration-proof device including an inner having an annular protrusion extending outward in the axial direction from at least one end face in the axial direction, a cylindrical outer arranged radially outside the inner, an elastic body connecting an inner peripheral surface of the outer and an outer peripheral surface of the inner, and a retainer arranged at at least one end in the axial direction of the inner and having an opening penetrating in the axial direction, the manufacturing method including a connecting step of connecting and molding the elastic body between the inner and the outer, and a connecting step of connecting the annular protrusion of the inner to the opening of the retainer. and a crimping step of inserting a tubular protrusion into the inner member using a crimping jig having a cylindrical outer circumferential surface and a plurality of enlarged diameter portions that are enlarged in the radial direction on the outer circumferential surface and are arranged at a distance from each other in the circumferential direction, and inserting the crimping jig into the inner circumferential side of the annular protrusion of the inner member, so that the portions of the annular protrusion where the enlarged diameter portions of the crimping jig are arranged are pressed against the inner circumferential surface of the opening of the retainer, forming a plurality of crimp fixing portions that are arranged at a distance from each other in the circumferential direction of the annular protrusion, and fixing the retainer to the inner member. The crimping jig includes, in a cross section perpendicular to the axis at a portion where the crimping fixing portion is formed, the plurality of enlarged diameter portions, and a plurality of curved surface connecting portions that are located between the plurality of enlarged diameter portions in the circumferential direction, connect the plurality of enlarged diameter portions in the circumferential direction, and are formed in a curved shape that is convex radially inward. .

[0025] The present invention ten The manufacturing method of the vibration-proof device according to the aspect is a manufacturing method of a vibration-proof device including an inner having an annular protrusion extending outward in the axial direction from at least one end face in the axial direction, a cylindrical outer disposed radially outside the inner, an elastic body connecting an inner peripheral surface of the outer and an outer peripheral surface of the inner, and a retainer disposed at at least one end in the axial direction of the inner and having an opening penetrating in the axial direction, the manufacturing method including the manufacturing method of the vibration-proof device including a cylindrical outer peripheral surface and a plurality of elastic bodies each having a cylindrical outer peripheral surface and a plurality of elastic bodies each having a cylindrical outer peripheral surface and a plurality of elastic bodies each having a cylindrical outer peripheral surface and a plurality of elastic bodies each having a cylindrical outer peripheral surface and a plurality of elastic bodies each having a cylindrical outer peripheral surface and a plurality of elastic bodies each having an elastic surface and ... a crimping step of inserting a crimping jig having a plurality of enlarged diameter portions spaced apart from one another in the circumferential direction of the annular protrusion of the inner member inserted into the opening of the retainer into the inner circumferential side of the annular protrusion of the inner member, the portions of the annular protrusion where the enlarged diameter portions of the crimping jig are arranged are pressed against the inner circumferential surface of the opening of the retainer, and form a plurality of crimped fixing portions spaced apart from one another in the circumferential direction of the annular protrusion, thereby fixing the retainer to the inner member; The crimping jig includes, in a cross section perpendicular to the axis at a portion where the crimping fixing portion is formed, the plurality of enlarged diameter portions, and a plurality of curved surface connecting portions that are located between the plurality of enlarged diameter portions in the circumferential direction, connect the plurality of enlarged diameter portions in the circumferential direction, and are formed in a curved shape that is convex radially inward. .

[0026] No. Nine And ten According to this aspect, by inserting the crimping jig into the protruding portion of the inner, the protruding portion can be expanded toward the outer periphery at multiple locations in the circumferential direction by the expanding portion of the crimping jig, thereby forming multiple crimped fixing portions, and the inner and the retainer can be crimped and fixed by the crimped fixing portions. In this way, by the simple operation of inserting a crimping jig having multiple expanding portions into the protruding portion of the inner, multiple crimped fixing portions can be formed at the same time, and the inner and the retainer can be fixed by the multiple crimped fixing portions while suppressing the generation of burrs. Furthermore, when the crimping tool is inserted into the protruding portion, in the portion where the multiple enlarged diameter portions in the circumferential direction are located, multiple crimping and fixing portions are formed on the protruding portion, and in the portion where the multiple curved connecting portions in the circumferential direction are located, the protruding portion is not enlarged and deformed toward the outer periphery as much as the crimping and fixing portions, and the crimping and fixing portions compressed in the radial direction between the retainer and the enlarged diameter portions are allowed to escape to both sides in the circumferential direction. This prevents the generation of burrs in the crimping and fixing portions due to the enlarged diameter portions of the crimping tool being pressed into the crimping and fixing portions. Effect of the Invention

[0029] The vibration-isolating device of the present invention is provided with a plurality of crimped fixing portions, thereby suppressing the occurrence of burrs and making burr removal unnecessary or simplifying the process.

[0030] According to the manufacturing method of the vibration-damping device of the present invention, a cylindrical crimping jig in which multiple expanded diameter sections that are expanded radially are arranged circumferentially is used, and multiple crimped fixing sections are formed using the multiple expanded diameter sections, thereby suppressing the occurrence of burrs and making burr removal work unnecessary or simplified. [Brief description of the drawings]

[0031] [Figure 1] 2. FIG. 3 is a vertical cross-sectional view showing the vibration isolation device according to one embodiment of the present invention, which is a view corresponding to cross-section II in FIG. [Diagram 2] FIG. 2 is a plan view of the vibration isolation device shown in FIG. [Diagram 3] 2. This is a cross-sectional view taken along line II in FIG. 2, showing the state before the inner member and the retainer are crimped together. [Figure 4] 2 is an enlarged cross-sectional view illustrating a state before an inner member and a retainer are assembled in the vibration-proof device of FIG. 1. [Diagram 5] 2 is an enlarged cross-sectional view illustrating a state in which a retainer is attached to an inner part in the vibration-proof device of FIG. 1. FIG. [Figure 6] 2 is a cross-sectional view illustrating a connecting step before the vibration-proof device of FIG. 1 is fixed by caulking. FIG. [Figure 7] 2 is a cross-sectional view illustrating an insertion step before the vibration-isolating device in FIG. 1 is fixed by crimping. [Figure 8] 2 is a cross-sectional view illustrating a crimping step for crimping and fixing the vibration-proof device of FIG. 1. [Figure 9] 2 is a cross-sectional view illustrating a state in which the vibration-isolating device of FIG. 1 has been fixed by caulking. [Figure 10] 2 is a bottom view of a first crimping fixture for the vibration-proof device of FIG. 1. FIG. [Figure 11] 11 is a cross-sectional view corresponding to the XI-XI axial direction in FIG. [Figure 12] 2 is a plan view of a second crimping fixture for the vibration-proof device of FIG. 1. [Figure 13] 13 is a cross-sectional view corresponding to the XIII-XIII axis direction in FIG. 12. [Figure 14] FIG. 4 is a vertical cross-sectional view showing an anti-vibration device according to another embodiment of the present invention. [Figure 15] FIG. 11 is a plan view showing an anti-vibration device according to still another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the structure of the vibration isolation device to which the present invention is applied will be described. In the following description, the vertical direction and the axial direction refer to the vertical direction in FIG. 1.

[0033] The vibration isolation device 1 according to this embodiment is attached, for example, between a vibration source (not shown) provided in an automobile and a vehicle frame (vehicle body).

[0034] 1 is a cross-sectional view showing a schematic example of a vibration-proof device 1 according to this embodiment. As shown in the figure, the vibration-proof device 1 includes a cylindrical inner 10, a cylindrical outer 20 arranged concentrically with the inner 10 and radially outward of the inner 10, an elastic body 30 arranged between the inner 10 and the outer 20, and a retainer 50 and a retainer 60 fixed by crimping to the axial end of the inner 10. In this embodiment, the elastic body 30 is made of rubber and is fixed to the inner 10 and the outer 20 by vulcanization adhesion.

[0035] The retainer 50 and the retainer 60 are fixed by crimping to both axial ends of the inner 10. In this embodiment, the retainer 50 and the retainer 60 are fixed by crimping to both axial ends, but the retainer may be fixed by crimping to only one end.

[0036] As shown in Figures 1, 2, 3, 4, 5, 6, 7, 8, and 9, the inner member 10 is made of a cylinder with a through hole 11 formed in the center. As shown in Figures 3 and 4, the inner member 10 has annular protrusions 12, 12 extending axially outward on both axial end faces 15, 15. As shown in Figures 1, 2, and 5, the annular protrusion 12 has a crimping fixing portion 13 and a connecting portion 14.

[0037] 1 and 3, the outer 20 is made of a cylindrical body having a thinner wall than the inner 10, and is provided with a flange portion 21 extending radially outward from one axial end portion. The flange portion 21 of the outer 20 is provided with an annular stopper 35 in the axial direction.

[0038] As shown in Figs. 1 and 3, the elastic body 30 is vulcanized and bonded to the outer peripheral surface of the inner member 10 and the inner peripheral surface of the outer member 20, and has a groove 31 extending in the axial direction.

[0039] The retainer 50 is made of a circular plate, and has a circular opening 51 penetrating in the axial direction in its central portion, as shown in Figs. 3, 4, and 6. The inner peripheral surface 52 of the opening 51 has a straight portion 53 and a step portion 54. The step portion 54 protrudes toward the inner circumference on the inner peripheral surface of the opening 51, and is partially provided on the inner 10 side in the plate thickness direction (axial direction) of the retainer 50. The upper end of the step portion 54 may be angular, or may be a convex curved surface that slopes upward toward the outer periphery. In this embodiment, the step portion 54 is provided at the lower end of the retainer 50 against which the inner 10 abuts, but may be provided, for example, in the middle portion in the axial direction, and may be located on the lower side of the end face (upper face) of the retainer 50 opposite to the end face (lower face) on the abutting side of the inner 10. In this embodiment, the retainer 50 is a circular plate, but may be a rectangular, elliptical, or polygonal plate. The axial end face 15 of the inner 10 abuts against the opening periphery of the opening 51 of the retainer 50, and the retainer 50 is fixed to the axial end of the inner 10 and spreads in the axially perpendicular direction. The retainer 50 faces the flange portion 21 of the outer 20 in the axial direction, and the retainer 50 and the flange portion 21 of the outer 20 abut against each other via the annular stopper 35, thereby restricting the amount of relative displacement of the inner 10 and the outer 20 in the axial direction. In addition, the upper protrusion 12 protruding from the axial end face 15 of the inner 10 is inserted into the opening 51 of the retainer 50.

[0040] The retainer 60 is made of a circular plate, and has a circular opening 61 penetrating in the axial direction in its center, as shown in Figs. 3 and 6. The inner peripheral surface 62 of the opening 61 has the same straight portion and step portion (not shown) as the retainer 50. The similar step portion is provided on the inner 10 side in the plate thickness direction (axial direction) of the retainer 60. The retainer 60 is the same structure as the retainer 50 except for the outer diameter of the circular plate. In the description of this embodiment, the retainer 60 is a circular plate, but it may be a rectangular, elliptical, or polygonal plate. The retainer 60 is fixed to the axial end of the inner 10 on the opposite side to the retainer 50, spreads in the axial direction, and faces, for example, a stopper member (not shown) provided on the outer 20 side in the axial direction. The abutment of the retainer 60 and the stopper member limits the relative displacement amount in the axial direction between the inner 10 and the outer 20. Since the retainer 50 and the retainer 60 have the same structure except for the outer diameter, a detailed explanation will be given of the assembly and fixation of the retainer 50. Note that the retainer 50 and the retainer 60 may differ from each other in, for example, shape, thickness, etc.

[0041] FIG. 2 is a diagram illustrating the annular protrusion 12 of the vibration-proof device 1. The annular protrusion 12 of the inner 10 includes a plurality of crimped fixing parts 13 arranged at a distance from each other in the circumferential direction, and a plurality of connecting parts 14 are arranged between the plurality of crimped fixing parts 13 in the circumferential direction to connect each of them in the circumferential direction. The crimped fixing parts 13 have a circumferential length longer than the connecting parts 14, and are, for example, three times or more longer than the connecting parts 14. The arrangement of the plurality of crimped fixing parts 13 is not particularly limited, but in this embodiment, they are evenly arranged in the circumferential direction. The term "evenly arranged in the circumferential direction" used here means that they are arranged in a balanced manner as a whole in the circumferential direction. For example, even if a plurality of types of crimped fixing parts 13 having different circumferential lengths are provided, they can be evenly arranged as a whole. The crimped fixing parts 13, which are evenly arranged in the circumferential direction, are pressed against and fixed to the inner circumferential surface 52 of the opening 51 of the retainer 50, as shown in Fig. 5, and the retainer 50 is crimped and fixed to the inner 10. In addition, when the retainer 50 and the inner 10 are fixed, a gap 40 is formed between the connecting part 14 and the straight part 53 of the inner circumferential surface 52 of the retainer 50, as shown in Figs. 2 and 5. The protruding part 12 including the crimped fixing parts 13 and the connecting part 14 may be expanded in diameter over the entire circumference including not only the crimped fixing parts 13 but also the connecting part 14 by crimping. In addition, the protruding part 12 may have a diameter (inner diameter and / or outer diameter) of the connecting part 14 that is approximately the same as the initial shape after crimping.

[0042] In this way, by arranging a plurality of the crimped fixing parts 13 in the circumferential direction and providing the connecting parts 14 connecting the crimped fixing parts 13 between the crimped fixing parts 13 in the circumferential direction, when the crimped fixing parts 13 are compressed in the radial direction by the input during crimping and become thin, the crimped fixing parts 13 try to expand outward in the circumferential direction based on the Poisson's ratio. As a result, a circumferential compressive force acts on the connecting parts 14 adjacent to the crimped fixing parts 13 in the circumferential direction, and the connecting parts 14 bulge outward in the radial direction where the gap 40 is located based on the Poisson's ratio. Therefore, as shown in FIG. 5, the radial thickness T3 of the connecting parts 14 is thicker than the radial thickness T2 of the crimped fixing parts 13. Specifically, by dispersing the stress generated in the crimped fixing parts 13 to the connecting parts 14 during crimping and deforming the connecting parts 14, the formation of burrs (excess portions) generated on the inner circumferential surface 18 is suppressed. In other words, the burrs (excess) flow into the non-crimped connecting portion 14, and the thickness increases corresponding to the amount of burrs generated, thereby reducing or preventing the generation of burrs on the inner surface, and making burr removal unnecessary or simplified.

[0043] The crimp fixing portions 13 pressed against the inner peripheral surface 52 of the opening 51 of the retainer 50 are evenly arranged in the circumferential direction, so that the fixing force between the inner 10 and the retainer 50 acts in a well-balanced manner in the circumferential direction, realizing stable fixation. In addition, the crimp fixing portions 13 have a longer circumferential length than the connecting portions 14, so that a large contact area of ​​the crimp fixing portions 13 with the retainer 50 is ensured, and a large fixing force between the inner 10 and the retainer 50 by the crimp fixing portions 13 can be obtained.

[0044] 3 and 4 explain the state before the inner 10 and the retainer 50 are crimped and fixed. Before crimping and fixing, the annular protrusion 12 is cylindrical with a substantially constant inner diameter and outer diameter over the entire circumference, the crimping fixing portion 13 and the connecting portion 14 are not provided on the annular protrusion 12, and the inner peripheral surface of the annular protrusion 12 is a cylindrical surface located on an extension of the inner peripheral surface 18 of the inner 10. One annular protrusion 12 of the inner 10 is inserted into the opening 51 of the retainer 50. Also, the other annular protrusion 12 of the inner 10 is inserted into the opening 61 of the retainer 60.

[0045] 5 illustrates a state in which the inner 10 and the retainer 50 are fixed together. The annular protrusion 12 extending axially outwardly and formed on the axial end face 15 of the inner 10 is inserted into the opening 51 of the retainer 50, and is fixed by crimping using a crimping jig as shown in Fig. 7 and other figures described later.

[0046] After being crimped and fixed, the annular protruding portion 12 has a plurality of crimped fixing portions 13 arranged in the circumferential direction, and a plurality of connecting portions 14 connecting each of the plurality of crimped fixing portions 13. The crimped fixing portions 13 are formed by partially deforming the annular protruding portion 12 radially outward with a crimping jig described later, and are pressed against a straight portion 53 that constitutes the inner circumferential surface 52 of the retainer 50.

[0047] According to this structure, the annular protrusion 12 extending axially outwardly and formed on the axial end face 15 of the inner 10 is firmly fixed to the retainer 50 by the crimping fixing portion 13. Furthermore, the stepped portion 54 is caught and engaged with the crimping fixing portion 13 pressed against the straight portion 53, making it difficult for the retainer 50 to come off and more firmly fixed. In this embodiment, even after crimping, the axial end of the protrusion 12 is positioned inside the opening 51 of the retainer 50, preventing the retainer 50 from protruding axially outwardly from the outer surface of the retainer 50. Even in this embodiment, the crimping fixing portion 13 of the protrusion 12 is shaped to bend in the axial direction at the axially outer corner of the stepped portion 54 while being caught and engaged with the axially outer corner of the stepped portion 54, thereby exerting a large preventing force against the retainer 50 coming off axially outwardly. Although such a step 54 is effective in improving the force preventing the retainer 50 from coming off, it is not essential to the present invention, and the protrusion 12 may protrude axially outward from the retainer 50.

[0048] On the other hand, the multiple connecting parts 14 are formed between the multiple crimped fixing parts 13 in the circumferential direction by forming the crimped fixing parts 13 at multiple locations in the circumferential direction of the protruding part 12 by a crimping jig described later. The multiple connecting parts 14 are arranged away from the inner circumference of the straight part 53 constituting the inner circumferential surface 52 of the retainer 50 in a state in which the inner 10 and the retainer 50 are fixed by the crimped fixing parts 13, and have a gap 40 between each connecting part 14 and the straight part 53. Note that the connecting parts 14 may also be away from the step part 54 constituting the inner circumferential surface 52 of the retainer 50 in a state in which the inner 10 and the retainer 50 are fixed by the crimped fixing parts 13, but in this embodiment, the connecting parts 14 are pressed against the step part 54 to exert a supplementary fixing force. As shown in FIG. 5, the connecting parts 14 are located on the outer circumferential side of the step part 54 on the inner circumference of the straight part 53, and are engaged with the step part 54 in the axial direction, so that the supplementary fixing force can be efficiently exerted. In this embodiment, the multiple connecting portions 14 each abut against the inner surface 52 of the opening 51 of the retainer 50 at the step portion 54, but, for example, some of the multiple connecting portions 14 may abut against the step portion 54 and some may not abut against the step portion 54.

[0049] According to this structure, compared to burrs that would occur when the entire annular protruding portion 12 extending axially outwardly and formed on the axial end face 15 of the inner member 10 is crimped, the burrs (excess material) that would normally occur on the crimped fixing portion 13 are absorbed by flowing (deforming) into the adjacent connecting portions 14, thereby reducing or preventing the occurrence of burrs. That is, in order to prevent the occurrence of burrs, it is preferable that there is a gap 40 between the outer circumferential surface of the connecting portion 14 and the straight portion 53 even after the crimping is performed. In other words, if there is a gap 40 even after the crimping is performed, a sufficient place for the material that flows during the crimping is ensured, and the occurrence of burrs is suppressed.

[0050] 2 and 5, the radial thickness T3 of the connecting portion 14 is thicker than the radial thickness T2 of the crimped fixing portion 13. This is because, during crimping, the crimped fixing portion 13 is crushed between the retainer 50 and a crimping jig (described later) and thinned, and the connecting portion 14 is prevented from being thinned or is thickened by the forming material extruded from the crimped fixing portion 13.

[0051] According to this structure, the crimped fixing portion 13 is formed by deforming a part of the annular protruding portion 12 of the inner 10 radially outward by a crimping jig shown in FIG. 7 and the like, and is pressed against a straight portion 53 constituting an inner peripheral surface 52 of the retainer 50. Therefore, the thickness T2 of the crimped fixing portion 13 is slightly thinner than the radial thickness T1 of the annular protruding portion 12 before crimping. In addition, the thickness of the crimped fixing portion 13 that is less than the radial thickness T1 of the annular protruding portion 12 before crimping is fluidized (deformed), and the radial thickness T3 of the multiple connecting portions 14 is thicker than the radial thickness T1 of the annular protruding portion 12 before crimping and the radial thickness T2 of the crimped fixing portion 13. As a result, the generation of burrs is reduced or prevented.

[0052] In this embodiment, the inner 10 and the retainer 50 are made of a metal material. Conventionally, the inner 10 and the retainer 50 were made of a steel material, but in order to reduce the weight of the vibration-proof device 1, the material of the inner 10 is made of an aluminum alloy material, and the retainer 50 is made of a steel material, and the material hardness of the inner 10 is smaller than that of the retainer 50. In this way, when the material hardness of the inner 10 is smaller than that of the retainer 50, if the crimping is performed over the entire circumference as in the conventional technology, the crimping jig scrapes the inner circumferential surface 18 of the inner 10 before the crimping fixing portion 13 of the crimped portion of the inner 10 deforms radially outward, and the generation of burrs is likely to become a problem.

[0053] In this embodiment, the protruding portion 12 constituting the portion of the inner member 10 that is fixed to the retainer 50 by crimping has a structure including a plurality of crimping portions 13 arranged in the circumferential direction, and a plurality of connecting portions 14 that connect each of the plurality of crimping portions 13 in the circumferential direction. As a result, when an inner member 10 having a material hardness lower than that of the retainer 50 is used, it is possible to control the deformation (escape) of the inner member 10 while ensuring the crimping fixing force between the inner member 10 and the retainer 50, and even if the material hardness of the inner member 10 is lower than that of the retainer 50, it is possible to suppress the occurrence of burrs in the inner member 10 having a lower material hardness.

[0054] In this way, according to the vibration-damping device 1 of this embodiment, at the multiple crimping fixing portions 13, scraping of the inner surface 18 of the inner 10 by the crimping jig is reduced or avoided, and the material flows (deforms) toward the connecting portion 14 adjacent to the crimping fixing portion 13, thereby suppressing the occurrence of burrs.

[0055] Next, a method for manufacturing the vibration isolator 1 will be described with reference to FIGS. 6 to 9, and also with reference to FIGS. 10 to 13 as appropriate.

[0056] The manufacturing method of the vibration isolator 1 includes a connecting step, an inserting step, and a crimping step.

[0057] The connecting step is a step of forming the intermediate body 2 which is the main body of the vibration-proof device 1 excluding the retainers 50, 60. As shown in Fig. 6, with the outer body 20 fitted onto the inner body 10, the inner body 10 and the outer body 20 are placed in a predetermined molding die (not shown). Then, an unvulcanized rubber material is injected between the inner body 10 and the outer body 20, and the rubber material is vulcanized by a predetermined vulcanizing device (not shown) which has been conventionally used. In this way, an elastic body 30 is molded between the inner body 10 and the outer body 20, and the intermediate body 2 is formed.

[0058] When the connecting step is performed, the elastic body 30 is in a state of being vulcanized and bonded to the outer peripheral surface of the inner 10 and the inner peripheral surface of the outer 20. Note that since the vulcanization bonding is performed in a heated environment, tensile stress (tensile strain) remains in the elastic body 30 when cooled to room temperature. After cooling the intermediate body 2, the intermediate body 2 is attached to a diameter reduction jig (not shown) and the diameter of the intermediate body 2 is reduced.

[0059] When the intermediate body 2 is reduced in diameter, the residual tensile stress of the elastic body 30 is reduced or removed. In this embodiment, not only is the residual tensile stress of the elastic body 30 removed, but a compressive stress is also applied to the elastic body 30. This reduces the tensile stress acting on the elastic body 30 in use, and improves the durability of the elastic body 30.

[0060] The insertion step is a step of inserting the annular protrusions 12 provided at both ends of the inner 10 of the intermediate body 2 into the retainers 50 and 60. In the manufacture of the vibration-proof device 1 according to this embodiment, the retainers 50 and 60 are fixed to both axial ends of the inner 10, but only one of them may be used.

[0061] In the insertion step, the annular projections 12, 12 formed on both axial ends of the inner member 10 are inserted into the openings 51, 61 of the retainer 50 and the openings 61 of the retainer 60, as shown in FIGS.

[0062] Specifically, the retainer 60 and the intermediate body 2 are set in this order on a second crimping fixture 80 as a crimping fixture having a plurality of enlarged diameter portions 81 enlarged in the radial direction on the outer peripheral surface and spaced apart from each other in the circumferential direction as shown in Fig. 12, and the lower protrusion 12 of the intermediate body 2 is inserted into the opening 61 of the retainer 60. The upper protrusion 12 of the intermediate body 2 set on the second crimping fixture 80 is inserted into the opening 51 of the retainer 50, and the first crimping fixture 70 as a crimping fixture having a plurality of enlarged diameter portions 71 enlarged in the radial direction on the outer peripheral surface and spaced apart from each other in the circumferential direction as shown in Fig. 10 is inserted from above into the through hole 11 of the inner 10. The arrangement of the enlarged diameter portions 71, 81 is not particularly limited, but in this embodiment, they are arranged at equal intervals in the circumferential direction.

[0063] The crimping process is a process for fixing the inner 10 to the retainer 50 and the retainer 60. In the crimping process, as shown in Fig. 8, a first crimping fixture 70 having a substantially cylindrical outer circumferential surface with a plurality of enlarged diameter portions 71 arranged in the circumferential direction is lowered from above to a predetermined position and approaches a second crimping fixture 80. The predetermined position is a crimping position described later.

[0064] 7, 8, 11, and 13, the insertion guide portion 76 of the first crimping fixture 70 and the insertion guide portion 86 of the second crimping fixture 80 are inserted into the through hole 11 of the inner 10, and the first crimping fixture 70 and the second crimping fixture 80 are inserted into the inner circumferential side of the annular protrusions 12, 12 at both ends of the inner 10 at the crimping position. As a result, the portions of the annular protrusions 12, 12 at both ends where the multiple enlarged diameter portions 71, 81 of the first and second crimping fixtures 70, 80 are arranged are pressed against the inner circumferential surfaces 52, 62 of the openings 51, 61 of the retainers 50, 60, and multiple crimping fixtures 13 arranged at a distance from each other in the circumferential direction of the annular protrusions 12, 12 are formed, and the retainers 50, 60 are fixed to the inner 10. Also, connecting portions 14 are formed between the multiple crimping portions 13 in the circumferential direction and connect the multiple crimping portions 13 in the circumferential direction. The positions of the first and second crimping fixtures 70, 80 shown in Fig. 8 where the multiple crimping portions 13 and the multiple connecting portions 14 are formed on the protruding portions 12, 12 on both axial sides by the first and second crimping fixtures 70, 80 are set as the crimping positions. In other words, the crimping positions are the positions of the first and second crimping fixtures 70, 80 when the first and second crimping fixtures 70, 80 are closest to each other in the axial direction in the crimping step (described later) for forming the crimping portions 13. The first and second crimping fixtures 70, 80 arranged at the crimping position have the insertion guide portion 76 of the first crimping fixture 70 and the insertion guide portion 86 of the second crimping fixture 80 inserted entirely into the central hole of the inner member 10 including the protruding portions 12, 12. The first and second crimping fixtures 70, 80 arranged at the crimping position are positioned in the axial direction by abutting against at least one of the peripheral portions of the openings 51, 61 in the retainers 50, 60 and the protruding tips of the protruding portions 12, 12 from the axial outside.

[0065] In the crimping process, by using a crimping fixing jig 70, 80 having an approximately cylindrical outer peripheral surface on which multiple radially expanded portions 71, 81 are arranged circumferentially, the occurrence of burrs when molding the multiple crimping fixing portions 13 and the connecting portion 14 can be reduced or prevented, and burr removal work can be eliminated or simplified.

[0066] Fig. 10 is a bottom view of the first crimping jig 70 for the vibration-proof device 1 of Fig. 1. The first crimping jig 70 shown in Fig. 10 includes a crimping portion 77. In a cross section perpendicular to the axis at the portion forming the crimping portion 13, the crimping portion 77 includes a plurality of enlarged diameter portions 71 arranged in an annular shape, and a plurality of curved connecting portions 74 located between the enlarged diameter portions 71 in the circumferential direction, connecting each of the enlarged diameter portions 71 in the circumferential direction, and formed in a curved shape that is convex radially inward. The curved connecting portion 74 is formed by a radially inner convex portion 72 and curved portions 73, 73 located on both circumferential sides of the radially inner convex portion 72.

[0067] Fig. 11 is a cross section along the XI-XI axis of Fig. 10. The first crimping fixture 70 has a generally cylindrical outer circumferential surface extending in the axial direction, and is provided with a crimping portion 77 having a plurality of enlarged diameter portions 71 arranged in an annular shape with an insertion guide portion 76 at one end, and a curved connecting portion 74 connecting each of the enlarged diameter portions 71 in the circumferential direction. The crimping portion 77 is located at one of the annular protrusions 12, 12 provided at both ends of the inner member 10 when the first crimping fixture 70 is inserted into the inner member 10 and moved to the crimping position.

[0068] Fig. 12 is a plan view of a second crimping fixture 80 for the vibration-proof device of Fig. 1. The second crimping fixture 80 shown in Fig. 12 includes a crimping portion 87. In a cross section perpendicular to the axis in the portion forming the crimping fixture 13, the crimping portion 87 includes a plurality of enlarged diameter portions 81 arranged in an annular shape, and a plurality of curved connecting portions 84 located between the enlarged diameter portions 81 in the circumferential direction, connecting each of the enlarged diameter portions 81 in the circumferential direction, and formed in a curved shape that is convex radially inward. The curved connecting portion 84 is formed by a radially inner convex portion 82 and curved portions 83, 83 located on both circumferential sides of the radially inner convex portion 82.

[0069] Fig. 13 is an axial cross section taken along the line XIII-XIII of Fig. 12. The second crimping fixture 80 has a generally cylindrical outer circumferential surface extending in the axial direction, and is provided at one end with an insertion guide portion 86 and a crimping portion 87 having a plurality of enlarged diameter portions 81 arranged in an annular shape and curved connecting portions 84 connecting each of the enlarged diameter portions 81 in the circumferential direction. The crimping portion 87 is located at the other of the annular protrusions 12, 12 provided at both ends of the inner member 10 when the first crimping fixture 70 is inserted into the inner member 10 and moved to the crimping position.

[0070] 8, 11 and 13, the first crimping and fixing jig 70 is provided with an insertion hole 79 extending in the axial direction from the end face on the tip side (lower side) of the insertion into the inner 10. The second crimping and fixing jig 80 is provided with an insertion portion 89 that is inserted into the insertion hole 79 of the first crimping and fixing jig 70. By inserting the insertion portion 89 into the insertion hole 79, the first crimping and fixing jig 70 and the second crimping and fixing jig 80 are positioned relative to each other, and the crimping and fixing position is determined. In this embodiment, the insertion portion 89 is inserted into the insertion hole 79, the first crimping fixture 70 is overlapped with the retainer 50 from above in the axial direction, and the second crimping fixture 80 is overlapped with the retainer 60 from below in the axial direction, whereby the first crimping fixture 70 and the second crimping fixture 80 are positioned relative to each other in the axial direction. Also, in this embodiment, the insertion guide portion 76 of the first crimping fixture 70 and the insertion guide portion 86 of the second crimping fixture 80 are inserted into the through hole 11 of the inner 10 from both axial sides, and the insertion portion 89 is inserted into the insertion hole 79, whereby the first crimping fixture 70 and the second crimping fixture 80 are positioned relative to each other in the radial direction. Incidentally, by inserting the insertion portion 89 into the insertion hole 79, either one of the insertion guide portion 76 of the first crimping fixture 70 or the insertion guide portion 86 of the second crimping fixture 80 is made to have a smaller diameter than the inner diameter of the through hole 11 of the inner member 10, and is positioned radially at the crimping position even if it is spaced apart from the inner peripheral surface of the inner member 10. However, the insertion hole 79 and the insertion portion 89 are not essential, and for example, the first crimping fixture 70 and the second crimping fixture 80 may be positioned in the axial or radial directions via the intermediate body 2.

[0071] By using a crimping fixture of this structure to crimp the retainers 50, 60 and the inner 10, multiple crimping portions 13 are formed at positions spaced apart from each other in the circumferential direction via the connecting portions 14, thereby reducing or preventing the occurrence of burrs and eliminating or simplifying the need for burr removal work.

[0072] Fig. 14 shows an anti-vibration device 100 as another embodiment of the present invention. In the following description, the same members and parts as those in the above embodiment are denoted by the same reference numerals in the drawings and the description thereof will be omitted. As in the above embodiment, the retainer 50 and the retainer 60 have substantially the same structure, so the description of the retainer 60 will be omitted by describing the retainer 50.

[0073] In the vibration-proof device 100, the inner 10 is provided with a protruding portion 12 that protrudes from an end face in the axial direction, and a plurality of crimp fixing portions 13 of the protruding portion 12 are pressed against the inner peripheral surface 52 of the opening 51 of the retainer 50, and connecting portions 102 are provided between the crimp fixing portions 13 in the circumferential direction. The crimp fixing portions 13 are crimped and fixed to the retainer 50 by being pushed outwardly and pressed against the inner peripheral surface 52 of the opening 51 of the retainer 50, thereby fixing the retainer 50 to the inner 10. The crimp fixing portions 13 are pressed against the straight portion 53 and are spaced from the inner peripheral side surface of the stepped portion 54, and the crimp fixing portions 13 and Step 54 A gap 104 is formed between the connecting portion 102 and the inner circumferential surface 52 of the opening 51 of the retainer 50. Also, the crimping fixing portion 13 is engaged in the axial direction with respect to the stepped portion 54. When the retainer 50 is fixed to the inner 10, the connecting portion 102 is separated from the inner circumferential surface 52 of the opening 51 of the retainer 50 even at the stepped portion 54, and a gap 106 is formed between the entire connecting portion 102 and the inner circumferential surface 52 of the opening 51 of the retainer 50.

[0074] The vibration-proof device 100 having the structure according to this embodiment can also provide the same effect as the above embodiment. Since a gap 106 is provided between the inner peripheral surface 52 of the opening 51 of the retainer 50 and the connecting portion 102 over the entire axial length, the gap 106 effectively allows the circumferential expansion deformation accompanying the radial compressive deformation of the crimped fixing portion 13, and suppresses the generation of burrs when the crimped fixing portion 13 is expanded in diameter by a crimping jig (not shown). Furthermore, since a gap 104 is formed between the crimped fixing portion 13 and the step portion 54, the generation of burrs on the inner peripheral surface of the crimped fixing portion 13 is more effectively suppressed.

[0075] Although various embodiments of the present invention have been described above, the configurations and combinations thereof in each embodiment are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments.

[0076] For example, in the above embodiment, a plurality of crimped fixing portions 13 having the same shape and size are arranged in the circumferential direction, but the plurality of crimped fixing portions 13 may differ from one another in shape, circumferential length, etc. More specifically, for example, a first crimped fixing portion having a long circumferential length and a second crimped fixing portion having a short circumferential length may be arranged alternately in the circumferential direction.

[0077] In addition, in the above embodiment, multiple connecting portions 14 having the same shape and size are arranged in the circumferential direction, but the multiple connecting portions 14 may be different from each other in shape, circumferential length, etc.

[0078] In the above embodiment, the circumferential length of the crimped fixing portion 13 was longer than the circumferential length of the connecting portion 14, but for example, the crimped fixing portion 13 and the connecting portion 14 may have the same circumferential length, or the connecting portion 14 may have a longer circumferential length than the crimped fixing portion 13.

[0079] The protrusion 12 does not necessarily have to have a straight cylindrical shape, and for example, the portion where the crimped fixing portion 13 is formed may have a larger diameter before crimping than the portion where the connecting portion 14 is formed.

[0080] In the above embodiment, the inner peripheral surface 52 of the opening 51 of the retainer 50 has a straight portion 53 and a step portion 54, and the step portion 54 protrudes toward the inner circumference. However, the inner peripheral surface 52 of the opening 51 of the retainer 50 may be, for example, a straight cylindrical surface, a tapered surface expanding toward the outside in the axial direction, or may have a plurality of step portions (protrusions). The step portion does not have to be continuous over the entire circumference, and may be, for example, a plurality of step portions provided intermittently in the circumferential direction. In addition to or instead of providing the step portion 54, the opening end on the axial outer side of the opening 51 of the retainer 50 may be expanded in diameter in a tapered or chamfered shape, and the crimp fixing portion 13 at the tip of the protrusion 12 may be engaged therewith.

[0081] The one embodiment shows a mode in which the connecting portion 14 abuts against the inner circumferential surface 52 of the opening 51 of the retainer 50 at the step portion 54 and is separated from the straight portion 53, and the other embodiment shows a mode in which the connecting portion 102 is separated from the inner circumferential surface 52 of the opening 51 of the retainer 50 over its entire length, but for example, the abutment mode of the connecting portion against the inner circumferential surface of the opening of the retainer is not to be limited by the above embodiment. Below, for ease of understanding, the symbols of the above embodiment will be appropriately quoted and explained.

[0082] 15 , the connecting portion 112 may abut against the inner circumferential surface 52 of the opening 51 of the retainer 50 at both the stepped portion 54 and the straight portion 53. The connecting portion 112 is not expanded outward as actively as the crimped fixing portion 13, and for example, the crimped fixing portion 13 expands in both circumferential directions in association with radial compression, thereby thickening the connecting portion 112 and substantially filling the gap between the inner circumferential surface 52 of the opening 51 of the retainer 50 and the connecting portion 112, and the connecting portion 112 abuts against the inner circumferential surface 52 of the opening 51 of the retainer 50, including the straight portion 53. Therefore, for example, the connecting portion 112 may be in contact with the inner peripheral surface 52 of the opening 51 of the retainer 50 with a contact pressure smaller than that of the crimped fixing portion 13, and may have a radial thickness dimension larger than that of the crimped fixing portion 13, so that it may be shaped to protrude inwardly beyond the crimped fixing portion 13. If the connecting portion 112 abuts against the inner peripheral surface 52 of the opening 51 of the retainer 50 over the entire axial length in this manner, the gap between the retainer 50 and the connecting portion 112 is reduced or avoided, making it easier to prevent foreign matter from entering the gap. Note that the connecting portion may abut against the inner peripheral surface 52 of the retainer 50 at the straight portion 53, and may be spaced apart toward the inner peripheral surface at the stepped portion 54.

[0083] Also, in the above-described embodiment, it has been explained that it is preferable that T2 < T1 < T3. However, the thickness of each part does not necessarily have to be constant in the circumferential direction. T1 and T2 are the minimum thickness dimensions of the corresponding part, T3 is the maximum thickness dimension of the corresponding part, and it is preferable that T2 < T1 < T3 is satisfied. In such an embodiment, before caulking and fixing, the entire protruding portion 12 was formed with a substantially constant thickness dimension. However, the initial thickness of each part of the protruding portion 12 may be different. Further, when providing a plurality of caulking and fixing portions 13 in the circumferential direction with respect to the substantially cylindrical protruding portion 12 as in such an embodiment, in addition to or instead of comparing the thickness dimensions of each of the caulking and fixing portion 13 and the connecting portion 14, the inner diameter dimension of the caulking and fixing portion 13 is compared with the inner diameter dimension of the connecting portion 14, and it is preferable that the inner diameter dimension of the latter (14) is smaller than the inner diameter dimension of the former (13). Similarly, with respect to the outer diameter dimension, it is preferable that the outer diameter dimension of the latter (14) is smaller than the outer diameter dimension of the former (13).

[0084] It is desirable that the caulking and fixing portion 13 and the connecting portion 14 in the protruding portion 12 fixed to the inner 10 have their axial tips aligned over the entire circumference. However, for example, by allowing the wall thickness change associated with the caulking process of the caulking and fixing portion 13 to escape in the axial direction, the caulking and fixing portion 13 may be slightly larger in the axial dimension than the connecting portion 14. Furthermore, the present invention essentially includes each of the inventions described in (i) to (xii) below, and the configurations and effects thereof will be described below. The present invention relates to (i) a vibration-proof device comprising an inner, a cylindrical outer arranged radially outward of the inner, an elastic body connecting the inner and the outer, and a retainer arranged at at least one end in an axial direction of the inner and having an opening penetrating in the axial direction, the inner having an annular protrusion extending axially outward from at least one end face in the axial direction and inserted into the opening of the retainer, the annular protrusion having a plurality of crimp fixing portions arranged spaced apart from each other in the circumferential direction, the plurality of crimp fixing portions of the retainer being pressed against an inner circumferential surface of the opening, and the retainer being crimped and fixed to the inner; (ii) The vibration-proof device according to (i), wherein the annular protrusion includes a plurality of connecting portions located between the plurality of crimped fixing portions in the circumferential direction and connecting each of the plurality of crimped fixing portions in the circumferential direction, and the retainer is fixed to the inner member in a state in which the plurality of connecting portions have gaps between them and an inner peripheral surface of the opening. (iii) The vibration-proof device according to (i) or (ii), wherein the annular protrusion includes a plurality of connecting portions located circumferentially between the plurality of crimped fixing portions and connecting each of the plurality of crimped fixing portions in the circumferential direction, and the retainer is fixed to the inner member with the plurality of connecting portions abutting against an inner peripheral surface of the opening. (iv) The vibration-damping device according to (ii) or (iii), wherein the radial thickness of the connecting portion is greater than the radial thickness of the crimped fixing portion. (v) A vibration-damping device according to any one of claims (ii) to (iv), wherein a circumferential length of each of the crimped fixing portions is longer than a circumferential length of each of the connecting portions. (vi) The vibration-proof device according to any one of (i) to (v), wherein the material hardness of the inner member is lower than the material hardness of the retainer. (vii) The vibration-damping device according to any one of (i) to (vi), in which the multiple crimped fixing portions are evenly arranged in the circumferential direction. (viii) An anti-vibration device according to any one of (i) to (vii), in which an axial end face of the inner is abutted against an opening peripheral portion of the opening in the retainer, the annular protrusion protruding from the axial end face of the inner is inserted into the opening of the retainer, and an inner peripheral surface of the opening of the retainer has a stepped portion that partially protrudes toward the inner circumference on the abutting side of the inner, and the crimped fixing portion of the protrusion is engaged with the stepped portion in the axial direction. (ix) The vibration-proof device according to (viii), wherein the annular protrusion includes a plurality of connecting portions located circumferentially between the plurality of crimped fixing portions and connecting each of the plurality of crimped fixing portions in the circumferential direction, and the connecting portions abut against the inner peripheral surface of the opening at the step portion of the retainer, and are separated from the inner peripheral surface of the opening at a portion of the retainer that is apart from the step portion to form a gap. (x) A method for manufacturing an anti-vibration device comprising an inner having an annular protrusion extending axially outward from at least one end face in the axial direction, a cylindrical outer arranged radially outside the inner, an elastic body connecting an inner peripheral surface of the outer and an outer peripheral surface of the inner, and a retainer arranged at at least one end in the axial direction of the inner and having an opening penetrating in the axial direction, the method comprising: a connecting step of connecting and molding the elastic body between the inner and outer; and an inserting step of inserting the annular protrusion of the inner into the opening of the retainer. a crimping step of using a crimping jig having a cylindrical outer peripheral surface and having a plurality of enlarged diameter portions that are enlarged in diameter in the radial direction on the outer peripheral surface and are arranged at a distance from each other in the circumferential direction, and inserting the crimping jig into the inner peripheral side of the annular protrusion of the inner member, so that the portions of the annular protrusion where the enlarged diameter portions of the crimping jig are arranged are pressed against the inner peripheral surface of the opening of the retainer to form a plurality of crimp fixing portions that are arranged at a distance from each other in the circumferential direction of the annular protrusion, thereby fixing the retainer to the inner member; (xi) a method for manufacturing an anti-vibration device comprising an inner having an annular protrusion extending outward in the axial direction from at least one end face in the axial direction, a cylindrical outer arranged radially outside the inner, an elastic body connecting an inner peripheral surface of the outer and an outer peripheral surface of the inner, and a retainer arranged at at least one end in the axial direction of the inner and having an opening penetrating in the axial direction, the method comprising the steps of: using a crimping tool having a cylindrical outer peripheral surface and having a plurality of enlarged diameter portions, the enlarged diameter portions being enlarged in the radial direction on the outer peripheral surface and arranged spaced apart from each other in the circumferential direction, inserting the crimping tool into the inner peripheral side of the annular protrusion of the inner inserted into the opening of the retainer, so that the portions of the annular protrusion where the enlarged diameter portions of the crimping tool are arranged are pressed against the inner peripheral surface of the opening of the retainer, forming a plurality of crimped fixing portions arranged spaced apart from each other in the circumferential direction of the annular protrusion, and fixing the retainer to the inner; (xii) A method for manufacturing an anti-vibration device according to (x) or (xi), in which the crimping jig, in a cross section perpendicular to the axis in a portion where the crimped fixing portion is formed, includes the plurality of enlarged diameter portions and a plurality of curved surface connecting portions located between the plurality of enlarged diameter portions in the circumferential direction, connecting each of the plurality of enlarged diameter portions in the circumferential direction, and formed into curved surfaces that are convex radially inward; This includes inventions relating to. In the invention described in (i) above, by providing a plurality of crimping portions at the protruding portion of the inner member at a distance from one another in the circumferential direction, when the crimping portions of the inner member are pressed against the inner peripheral surface of the retainer and crimped, burrs on the inner peripheral surface of the inner member (protruding portion) are suppressed compared to when the entire circumference is crimped. Therefore, burrs can be easily removed, or burr removal work is not required. In the invention described in (ii) above, the connecting portions provided between the multiple crimped fixing portions in the circumferential direction have gaps between them and the retainer, so that when the crimped fixing portions are pressed against the inner peripheral surface of the opening of the retainer and crimped, the gaps allow the crimped fixing portions to deform in the circumferential direction. Therefore, when the crimped fixing portions are expanded to the outer periphery and crimped, burrs are unlikely to occur on the inner peripheral surface of the crimped fixing portions. In the invention described in (iii) above, by the connecting portion abutting against the inner peripheral surface of the retainer, for example, a supplementary fixing force can be applied between the connecting portion and the retainer, improving the fixing strength between the inner and the retainer. Also, it is possible to prevent the intrusion of foreign matter such as water through the gap between the connecting portion and the retainer. In the invention described in (iv) above, if the connecting portion is radially thicker than the crimped fixing portion when the inner and retainer are crimped and fixed, then circumferential elongation deformation (movement of forming material) occurs from the crimped fixing portion to the connecting portion during crimping, and the generation of burrs due to excessive compression of the crimped fixing portion between the crimping jig and the retainer is suppressed. In the invention described in (v) above, the circumferential length of the area where the inner and the retainer are crimped and fixed by the crimping portion is increased, improving the fixing strength between the inner and the retainer. Also, by crimping the inner and the retainer over a wide range in the circumferential direction, the inner and the retainer are less likely to be inclined or misaligned relative to each other when fixed, allowing for stable assembly of the inner and the retainer. In the invention described in (vi) above, even if the material hardness of the inner, in which burrs are likely to occur, is lower than the material hardness of the retainer, the inner and retainer can be crimped and fixed by a plurality of crimping fixing parts arranged at a distance from each other in the circumferential direction, thereby making it possible to effectively fix the inner and retainer while suppressing the occurrence of burrs on the inner due to significant deformation of the inner, which has a lower material hardness. In the invention described in (vii) above, the fixing force of the crimped fixing portion acts in a well-balanced manner in the circumferential direction, so that the inner member and the retainer are stably fixed to each other. In addition, it is possible to prevent the protruding portion from becoming distorted in shape after the crimping. In the invention described in (viii) above, the crimped fixing portion of the inner is engaged with the step portion of the retainer in the axial direction, so that a large resistance force against the protruding portion coming out of the opening of the retainer is exerted, and it is possible to prevent the inner and the retainer from being separated in the axial direction. Moreover, because the step portion is partially provided on the inner circumferential surface of the opening of the retainer on the abutting side of the inner, it is possible to engage the crimped fixing portion with the step portion without the crimped fixing portion protruding significantly from the opening of the retainer, and for example, it is also possible to engage the crimped fixing portion with the step portion while being accommodated in the inner circumferential surface of the opening of the retainer. In the invention described in (ix) above, the connecting portion abuts against the step portion, thereby providing a supplementary fixing force between the inner and the retainer. Also, since the connecting portion is spaced apart from the inner circumferential surface of the opening at the portion where it leaves the step portion, the connecting portion prevents burrs from being generated at the crimped fixing portion when the inner and the retainer are crimped. In the inventions described in (x) and (xi) above, by inserting a crimping jig into the protruding portion of the inner, the protruding portion can be expanded toward the outer periphery at multiple locations in the circumferential direction by the expanding portion of the crimping jig, thereby forming multiple crimped fixing portions, and the inner and retainer can be crimped and fixed by the crimped fixing portions. In this way, by the simple task of inserting a crimping jig having multiple expanding portions into the protruding portion of the inner, multiple crimped fixing portions can be formed at the same time, and the inner and retainer can be fixed by the multiple crimped fixing portions while suppressing the generation of burrs. In the invention described in (xii) above, when the crimping jig is inserted into the protruding portion, multiple crimping portions are formed on the protruding portion in the portion where the multiple enlarged diameter portions in the circumferential direction are located, and the protruding portion is not enlarged in diameter toward the outer periphery as much as the crimping portions in the portion where the multiple curved connecting portions in the circumferential direction are located, and the crimping portions compressed in the radial direction between the retainer and the enlarged diameter portions are allowed to escape to both sides in the circumferential direction. This prevents burrs from being generated in the crimping portions due to the enlarged diameter portions of the crimping jig being pressed into the crimping portions. [Explanation of symbols]

[0085] 1. Vibration isolation device (one embodiment) 2. Intermediates 10. Inna 11 Through hole 12 Protrusion 13 Crimping fixing part 14 Connecting part 15 End face 18 Inner surface 20 Outer 21 Flange 30 Elastic Body 31 Currant 35 Annular stopper 40 Gap 50 Retainer 51 Opening 52 Inner surface 53 Straight section 54 Step 60 Retainer 61 Opening 62 Inner surface 70 First crimping fixture (crimping fixture) 71 Expanded diameter part 72 Radial inner convex part 73 Curved surface part 74 Curved connection part 76 Insertion guide part 77 Crimping part 79 Insertion hole 80 Second crimping fixture (crimping fixture) 81 Expanded diameter part 82 Radial inner convex part 83 Curved surface part 84 Curved connection part 86 Insertion guide part 87 Crimping part 89 Insertion section 100 Vibration isolation device (another embodiment) 102 Connection part 104 Gap 106 Gap 110 Vibration isolation device (another embodiment) 112 Connection part T1, T2, T3 Radial thickness

Claims

1. With Inna, a cylindrical outer disposed radially outside the inner; an elastic body connecting the inner and the outer; a retainer disposed at least at one end of the inner member in the axial direction and having an opening penetrating therethrough in the axial direction; the inner member includes an annular protrusion extending outward in the axial direction from at least one end face of the inner member in the axial direction and inserted into the opening of the retainer; The annular protrusion includes a plurality of crimp fixing portions spaced apart from one another in the circumferential direction, The retainer is fixed to the inner member by crimping the plurality of crimping portions against the inner peripheral surface of the opening. the annular protrusion includes a plurality of connecting portions located between the plurality of crimped fixing portions in the circumferential direction and connecting the plurality of crimped fixing portions in the circumferential direction, The retainer is fixed to the inner member with gaps between the multiple connecting portions and the inner circumferential surface of the opening.

2. the annular protrusion includes a plurality of connecting portions located between the plurality of crimped fixing portions in the circumferential direction and connecting the plurality of crimped fixing portions in the circumferential direction, The vibration-isolating device according to claim 1 , wherein the retainer is fixed to the inner member with the plurality of connecting portions abutting against an inner circumferential surface of the opening.

3. 3. The vibration isolation device according to claim 1, wherein a radial thickness of the connecting portion is greater than a radial thickness of the crimped fixing portion.

4. The vibration-isolating device according to claim 1 , wherein a circumferential length of each of the crimped fixing portions is longer than a circumferential length of each of the connecting portions.

5. An inner layer, a cylindrical outer disposed radially outside the inner; an elastic body connecting the inner and the outer; a retainer disposed at least at one end of the inner member in the axial direction and having an opening penetrating therethrough in the axial direction; the inner member includes an annular protrusion extending outward in the axial direction from at least one end face of the inner member in the axial direction and inserted into the opening of the retainer; The annular protrusion includes a plurality of crimp fixing portions spaced apart from one another in the circumferential direction, The retainer is fixed to the inner member by crimping the plurality of crimping portions against the inner peripheral surface of the opening. A vibration-isolating device, wherein the material hardness of the inner member is less than the material hardness of the retainer.

6. The vibration-isolating device according to any one of claims 1 to 5, wherein the plurality of crimped fixing portions are evenly arranged in the circumferential direction.

7. an axial end surface of the inner member is abutted against an opening peripheral portion of the opening of the retainer, and the annular protruding portion protruding from the axial end surface of the inner member is inserted into the opening of the retainer; An anti-vibration device as described in any one of claims 1 to 6, wherein the inner surface of the opening of the retainer has a step portion that partially protrudes toward the inner circumference on the abutting side of the inner member, and the crimped fixing portion of the protruding portion is engaged with the step portion in the axial direction.

8. An inner layer, a cylindrical outer disposed radially outside the inner; an elastic body connecting the inner and the outer; a retainer disposed at least at one end of the inner member in the axial direction and having an opening penetrating therethrough in the axial direction; the inner member includes an annular protrusion extending outward in the axial direction from at least one end face of the inner member in the axial direction and inserted into the opening of the retainer; The annular protrusion includes a plurality of crimp fixing portions spaced apart from one another in the circumferential direction, The retainer is fixed to the inner member by crimping the plurality of crimping portions against the inner peripheral surface of the opening. an axial end surface of the inner member is abutted against an opening peripheral portion of the opening of the retainer, and the annular protruding portion protruding from the axial end surface of the inner member is inserted into the opening of the retainer; an inner peripheral surface of the opening of the retainer includes a step portion that partially projects toward the inner peripheral surface on the abutting side of the inner member, and the crimping fixing portion of the protruding portion is engaged with the step portion in the axial direction; the annular protrusion includes a plurality of connecting portions located between the plurality of crimped fixing portions in the circumferential direction and connecting the plurality of crimped fixing portions in the circumferential direction, An anti-vibration device, wherein the connecting portion abuts against the inner surface of the opening at the step portion of the retainer, and is separated from the inner surface of the opening at a portion of the retainer that is away from the step portion, leaving a gap.

9. A method for manufacturing an anti-vibration device comprising: an inner having an annular protrusion extending outward in the axial direction from at least one end face of the inner; a cylindrical outer arranged radially outside the inner; an elastic body connecting an inner peripheral surface of the outer and an outer peripheral surface of the inner; and a retainer arranged at at least one end of the inner in the axial direction and having an opening penetrating in the axial direction, a connecting step of connecting and molding the elastic body between the inner and outer members; an insertion step of inserting the annular protrusion of the inner member into the opening of the retainer; a crimping process in which a crimping tool having a cylindrical outer peripheral surface and a plurality of enlarged diameter portions that are enlarged in the radial direction on the outer peripheral surface and are arranged at a distance from one another in the circumferential direction is used to insert the crimping tool into the inner peripheral side of the annular protrusion of the inner member, whereby the portions of the annular protrusion where the enlarged diameter portions of the crimping tool are arranged are pressed against the inner peripheral surface of the opening of the retainer to form a plurality of crimp fixing portions that are arranged at a distance from one another in the circumferential direction of the annular protrusion, thereby fixing the retainer to the inner member, A manufacturing method for a vibration-proof device, wherein the crimping jig, in a cross section perpendicular to the axis at a portion where the crimping fixed portion is formed, is provided with the plurality of enlarged diameter portions and a plurality of curved connecting portions located circumferentially between the plurality of enlarged diameter portions, connecting each of the plurality of enlarged diameter portions circumferentially, and formed in a curved shape that convex radially inward.

10. A method for manufacturing an anti-vibration device comprising: an inner having an annular protrusion extending outward in the axial direction from at least one end face of the inner; a cylindrical outer arranged radially outside the inner; an elastic body connecting an inner peripheral surface of the outer and an outer peripheral surface of the inner; and a retainer arranged at at least one end of the inner in the axial direction and having an opening penetrating in the axial direction, a crimping process for fixing the retainer to the inner member by inserting a crimping jig having a cylindrical outer peripheral surface, the crimping jig having a plurality of enlarged diameter portions that are enlarged in the radial direction on the outer peripheral surface and spaced apart from each other in the circumferential direction, into the inner peripheral side of the annular protrusion of the inner member inserted into the opening of the retainer, so that the portions of the annular protrusion where the enlarged diameter portions of the crimping jig are arranged are pressed against the inner peripheral surface of the opening of the retainer, forming a plurality of crimp fixing portions that are spaced apart from each other in the circumferential direction of the annular protrusion, A manufacturing method for a vibration-proof device, wherein the crimping jig, in a cross section perpendicular to the axis at a portion where the crimping fixed portion is formed, is provided with the plurality of enlarged diameter portions and a plurality of curved connecting portions located circumferentially between the plurality of enlarged diameter portions, connecting each of the plurality of enlarged diameter portions circumferentially, and formed in a curved shape that convex radially inward.

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