Manufacturing method of vibration isolation device

Abstract

To increase a ratio of rigidity in an axial direction to rigidity in a direction perpendicular to an axis in a vibration control device and inhibit distortion and protruding of an elastic body at an outer end as seen in the axial direction.SOLUTION: A vibration control bush 1 includes: an inner cylinder 10 in which a pillow ball 12 expanding to a radial outer side is provided at a center part 10a as seen in an axial direction on an outer peripheral surface 11; an outer cylinder 20 disposed around the inner cylinder 10; and an elastic body 30 wich connects the inner cylinder 10 with the outer cylinder 20 therebetween. An outer end 30b as seen in the axial direction of the elastic body 30 is provided with: a protruding part 32 protruding to the axial outer side; an outer periphery groove part 33 recessed to the axial inner side at the radial outer side relative to the protruding part 32; and a space part 34 formed at a radial inner side relative to the protruding part 32. A manufacturing method of the vibration control bush 1 includes a bending step in which an outer end 20b as seen in the axial direction of the outer cylinder 20 in the vibration control bush 1 is bent to the radial inner side so as to press the protruding part 32 and fill the outer peripheral groove part 33.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a vibration isolator.

Background Art

[0002] The vibration isolation bush (vibration isolator) disclosed in Patent Document 1 includes an inner cylinder provided with a spherical portion (pyro ball) formed in a substantially spherical shape outward in the radial direction on the outer peripheral surface, an outer cylinder disposed concentrically and spaced apart from the inner cylinder so as to face the spherical portion, and an elastic body that connects between the inner cylinder and the outer cylinder so as to cover the spherical portion. The axially outer end portion of the elastic body extends to the vicinity of the axially outer end portion of the outer cylinder. The vicinity of the axially outer end portion of the outer cylinder is bent (buckled) toward the inner cylinder. Specifically, it is bent substantially at a right angle toward the inner cylinder by press working, and thus is pressed against the axially outer end portion of the elastic body.

[0003] When the inner cylinder and the outer cylinder relatively move axially with respect to each other, the vicinity of the axially outer end portion of the bent outer cylinder and the spherical portion of the inner cylinder serve as walls to axially compress the elastic body. Therefore, since the elastic body is difficult to deform axially, the axial rigidity of the vibration isolation bush is high. Also, since the elastic body is likely to deform in the torsional direction starting from the spherical portion of the inner cylinder, the torsional rigidity of the vibration isolation bush is low. That is, in the vibration isolation bush according to Patent Document 1, the ratio of the axial rigidity to the torsional rigidity is large.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the vibration-damping bush described in Patent Document 1, after the outer cylinder is bent radially inward (crimped) near the axial outer end toward the inner cylinder, there is a concern that distortion may occur in the axial outer end of the elastic body, or that a part of the axial outer end of the elastic body may protrude axially outward through the gap between the inner and outer cylinders.

[0006] This disclosure has been made in view of the above, and its purpose is to increase the axial stiffness ratio with respect to the direction perpendicular to the axis in the vibration isolation device, and to suppress strain and protrusion at the axial outer end of the elastic body. [Means for solving the problem]

[0007] A method for manufacturing a vibration isolation device according to the present disclosure comprises a preparation step of preparing a vibration isolation device, the inner member being cylindrical or axial in shape, having a bulge that bulges radially outward in the axial middle portion of its outer surface; an outer cylinder arranged around the inner member; and an elastic body interposed between the inner member and the outer cylinder to connect them, wherein the axial outer end of the elastic body is provided with a protrusion that projects axially outward, an outer circumferential groove that recesses axially inward radially outward from the protrusion, and a space formed radially inward from the protrusion; and a bending step of bending the axial outer end of the outer cylinder in the vibration isolation device radially inward so as to press the protrusion and fill at least a part of the outer circumferential groove.

[0008] With this configuration, when an axial external force is applied to the vibration isolation device, the axial outer end of the bent outer cylinder and the bulging portion of the inner member act as walls, compressing the elastic body in the axial direction. As a result, the elastic body is less likely to deform in the axial direction, and the axial rigidity of the vibration isolation device is high. On the other hand, the elastic body is easily deformed in one twisting direction perpendicular to the axis, starting from the bulging portion of the inner member, so the rigidity of the vibration isolation device in the direction perpendicular to the axis (especially the twisting direction) is low.

[0009] In this way, by providing a bulge on the outer surface of the inner member, the axial stiffness ratio with respect to the direction perpendicular to the axis (especially the twisting direction) in the vibration isolation device can be increased.

[0010] When the outer axial end of the outer cylinder is bent radially inward during the bending process, the axial outer end of the bent outer cylinder presses against the protrusion at the axial outer end of the elastic body. As a result, the protrusion of the elastic body is pre-compressed in the axial direction, which can increase the axial rigidity of the vibration isolation device.

[0011] Furthermore, during the bending process, the outer circumferential groove at the axial outer end of the elastic body is filled, so not only the protruding portion but also the portion at the axial outer end of the elastic body where the outer circumferential groove existed before bending is pressed against the axial outer end of the bent outer cylinder and pre-compressed in the axial direction. As a result, the axial rigidity of the vibration isolation device can be further increased compared to the case where only the protruding portion is pre-compressed.

[0012] Since an outer circumferential groove is provided at the axial outer end of the elastic body, the range of deformation in the direction perpendicular to the axis of the elastic body is increased. This makes it possible to suppress the occurrence of strain at the axial outer end of the elastic body when the vibration isolator is displaced in the direction perpendicular to the axis of the device.

[0013] When the outer axial end of the outer cylinder is bent radially inward during the bending process, a portion of the elastic body is pushed out into a space provided at its outer axial end. By securing a region (volume compensation area, space) to allow the pushed-out elastic body to escape in this way, it is possible to prevent the outer axial end of the elastic body from protruding axially outward through the gap between the inner member and the outer cylinder.

[0014] In summary, the axial stiffness ratio (axial stiffness / stiffness perpendicular to the axis, spring ratio) in the vibration isolation device can be increased, while strain and protrusion at the axial outer end of the elastic body can be suppressed.

[0015] In one embodiment, the outer axial end of the elastic body is provided with an inner circumferential groove that is recessed in the axial direction radially inward from the space mentioned above.

[0016] According to such a configuration, since the elastic body is likely to deform in the direction perpendicular to the axis, the rigidity in the direction perpendicular to the axis in the vibration isolator can be reduced. That is, the rigidity ratio of the axial direction to the direction perpendicular to the axis in the vibration isolator can be made larger.

[0017] In one embodiment, the space portion is formed in an arc shape convex inward in the axial direction.

[0018] According to such a configuration, compared with the case where the space portion is formed in a rectangular shape with the same volume, the extruded elastic body can easily escape into the space portion (excellent volume compensation effect).

[0019] In one embodiment, the bending position in the bending step is located axially inward of the bottommost part of the outer peripheral groove portion.

[0020] According to such a configuration, in the bending step, the outer peripheral groove portion of the elastic body can be more reliably filled.

[0021] In one embodiment, the innermost part in the axial direction in the space portion is located axially inward of the bottommost part of the outer peripheral groove portion.

[0022] According to such a configuration, since the space portion can be made larger, the protrusion of the axially outer end portion of the elastic body can be further suppressed.

Effect of the Invention

[0023] According to the present disclosure, the rigidity ratio of the axial direction to the direction perpendicular to the axis in the vibration isolator can be increased, and the distortion and protrusion at the axially outer end portion of the elastic body can be suppressed.

Brief Description of the Drawings

[0024] [Figure 1] FIG. 1 is a perspective view showing a vibration isolator bush according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a side view showing the vibration isolator bush. [Figure 3]FIG. 3 is a front cross-sectional view showing the vibration isolator bush. [Figure 4] FIG. 4 is an enlarged view of part IV in FIG. 3, showing the axially outer end portion of the elastic body before the bending process. [Figure 5] FIG. 5 is a corresponding view of FIG. 4, showing the axially outer end portion of the elastic body during the bending process. [Figure 6] FIG. 6 is a corresponding view of FIG. 4, showing the axially outer end portion of the elastic body after the bending process. [Figure 7] FIG. 7 is a corresponding view of FIG. 2 according to another embodiment.

Embodiments for Carrying Out the Invention

[0025] Hereinafter, embodiments of the present disclosure will be described in detail based on the drawings. The following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present disclosure, its applications, or its uses in any way.

[0026] (Configuration of the Vibration Isolator Bush) FIGS. 1 to 3 show a vibration isolator bush 1 as a vibration isolator. FIG. 1 is a perspective view, FIG. 2 is a side view taken in the direction of arrow II, and FIG. 3 is a front cross-sectional view taken along line III-III. The vibration isolator bush 1 is used, for example, as a suspension bush of an automobile, and attenuates the vibration of the vehicle body during vehicle travel. The vibration isolator bush 1 has a central axis O. Hereinafter, the direction in which the central axis O extends is referred to as the axial direction. The direction perpendicular to the axial direction is referred to as the direction perpendicular to the axis. The direction perpendicular to the axis includes the radial direction of the vibration isolator bush 1, the circumferential direction (twisting direction) of the vibration isolator bush 1, and the kink direction of the vibration isolator bush 1.

[0027] As shown in FIGS. 1 to 3, the vibration isolator bush 1 includes a cylindrical inner cylinder (inner member) 10, a cylindrical outer cylinder 20 disposed around the inner cylinder 10, and an elastic body 30 interposed between the inner cylinder 10 and the outer cylinder 20 to connect the two.

[0028] The inner cylinder 10 is bolted to, for example, a bracket (not shown) on the vehicle body side. The inner cylinder 10 is made of metal (iron, aluminum, etc.). As shown in Figure 3, a pillow ball 12 is provided as a bulge at the axial center portion 10a of the outer circumferential surface 11 of the inner cylinder 10. The pillow ball 12 is spherical in shape and bulges (protrudes) radially outward.

[0029] The outer cylinder 20 is press-fitted and fixed to, for example, the cylindrical portion (not shown) of a suspension link. The outer cylinder 20 is made of metal (iron, aluminum, etc.). As shown in Figure 3, the axial center portion 20a of the outer cylinder 20 corresponds to the pillow ball 12 (axial center portion 10a) of the inner cylinder 10. The axial outer end portion 10b of the inner cylinder 10 is located axially outward from the axial outer end portion 20b of the outer cylinder 20. The pillow ball 12 of the inner cylinder 10 is the starting point of the twisting displacement of the vibration-damping bush 1.

[0030] The elastic body 30 is made of rubber. The elastic body 30 is cylindrical. The elastic body 30 is integrally molded by vulcanization together with the inner cylinder 10 and the outer cylinder 20. As shown in Figure 3, a spherical recess 31 that is recessed radially outward is provided in the axial center portion 30a of the inner circumferential surface of the elastic body 30, corresponding to the pillow ball 12 of the inner cylinder 10. The pillow ball 12 fits into the recess 31.

[0031] The axial outer end 30b of the elastic body 30 is located axially inward from the axial outer end 10b of the inner cylinder 10 and the axial outer end 20b of the outer cylinder 20. Here, "axial outer end 30b of the elastic body 30" refers to the axial outer end of the portion of the elastic body 30 that connects the inner cylinder 10 and the outer cylinder 20. The axial outer end 30b of the elastic body 30 extends radially between the inner cylinder 10 and the outer cylinder 20. Axially outward from the axial outer end 30b of the elastic body 30 is a thin film-like residual portion 30c that remains attached to the inner cylinder 10 and the outer cylinder 20 during the integral vulcanization molding process.

[0032] Figure 4 is an enlarged view of section IV in Figure 3, showing the axial outer end 30b of the elastic body 30 before the bending process described later. As shown in Figure 4, the axial outer end 30b of the elastic body 30 is formed in an inverted triangular shape when viewed radially, extending axially outward as it approaches the outer cylinder 20 side (radially outward) between the inner cylinder 10 and the outer cylinder 20. The axial outer end 30b of the elastic body 30 is provided with a protruding portion 32, an outer peripheral groove portion 33, a space portion 34, and an inner peripheral groove portion 35.

[0033] As shown in Figure 4, the projection 32 protrudes outward in the axial direction. The tip of the projection 32 is rounded in an arc shape. As shown in Figure 2, the projection 32 is formed in an annular shape around its entire circumference when viewed in the axial direction.

[0034] As shown in Figure 4, the outer circumferential groove 33 is recessed axially inward on the radially outward side of the protrusion 32. The bottom of the outer circumferential groove 33 is rounded in an arc shape. As shown in Figure 2, the outer circumferential groove 33 is formed in an annular shape around its entire circumference when viewed in the axial direction.

[0035] As shown in Figure 4, the space 34 is formed radially inward from the protruding portion 32. The space 34 is a region where the elastic body 30 does not exist. The space 34 is formed in a convex arc shape, both axially inward and radially outward. As shown in Figure 2, the space 34 is formed in an annular shape around its entire circumference when viewed in the axial direction.

[0036] As shown in Figure 4, the inner circumferential groove 35 is recessed axially inward radially inward from the space 34. The bottom of the inner circumferential groove 35 is rounded in an arc shape. As shown in Figure 2, the inner circumferential groove 35 is formed in an annular shape over its entire circumference when viewed in the axial direction.

[0037] The innermost axially inward portion 34a of the space 34 is located axially inward than the bottommost portion (the innermost axially inward portion) 33a of the groove bottom of the outer circumferential groove 33. The bottommost portion (the innermost axially inward portion) 35a of the groove bottom of the inner circumferential groove 35 is located axially inward than the bottommost portion 33a of the groove bottom of the outer circumferential groove 33 and the innermost axially inward portion 34a of the space 34.

[0038] (Manufacturing method for vibration-damping bushings) The method for manufacturing the vibration-damping bush 1 will be explained with reference to Figures 4 to 6. The method for manufacturing the vibration-damping bush 1 comprises a preparation step of preparing the vibration-damping bush 1 having the above-described configurations, and a bending step (crimping step) of bending the axial outer end 20b of the outer cylinder 20 of the vibration-damping bush 1 radially inward and crimping it. Figure 5 shows the axial outer end 30b of the elastic body 30 during the bending step. Figure 6 shows the axial outer end 30b of the elastic body 30 after the bending step.

[0039] As shown in Figures 4 and 5, in the bending process, the axial outer end 20b of the outer cylinder 20 of the vibration-damping bush 1 is bent radially inward at a bending position P located axially inward from the bottom 33a of the outer peripheral groove 33.

[0040] As a result, as shown in Figure 5, the protrusion 32 at the axial outer end 30b of the elastic body 30 is pressed (pressed against) by the axial outer end 20b of the bent outer cylinder 20. When the protrusion 32 is pressed, the elastic body 30 deforms and a portion of the outer circumferential groove 33 is filled in. Also, when the protrusion 32 is pressed, a portion of the elastic body 30 is pushed out and escapes into the space 34. Similarly, when the protrusion 32 is pressed, a portion of the elastic body 30 is pushed out and a portion of the inner circumferential groove 35 is filled in.

[0041] As shown in Figure 6, when the bending process is complete, almost the entire outer circumferential groove 33 at the axial outer end 30b of the elastic body 30 is filled. Similarly, when the bending process is complete, almost the entire space 34 is filled. Similarly, when the bending process is complete, almost the entire inner circumferential groove 35 is filled. At the completion of the bending process, a gap H is formed between the axial outer end 20b of the bent outer cylinder 20 and the outer circumferential surface 11 of the inner cylinder 10. The bending radius is, for example, about R5.

[0042] As shown by the dashed line in Figure 6, the axial outer end 20b of the bent outer cylinder 20 presses (presses against) not only the portion of the axial outer end 30b of the elastic body 30 where the protrusion 32 existed before the bending process, but also the portion of the axial outer end 30b of the elastic body 30 where the outer peripheral groove 33 existed before the bending process. In other words, the axial outer end 20b of the bent outer cylinder 20 presses (presses against) a wide area of ​​the axial outer end 30b of the elastic body 30. The outer cylinder 20 is crimped and fixed to the inner cylinder 10 via the elastic body 30.

[0043] Subsequently, the vibration-damping bush 1 is further compressed radially and press-fitted into the mating member (for example, the cylindrical portion of the suspension link).

[0044] (Effects and Benefits) According to this embodiment, since a pillow ball 12 is provided on the outer circumferential surface 11 of the inner cylinder 10, When an axial external force is applied to the vibration-damping bush 1, the axial outer end 20b of the bent outer cylinder 20 and the pillow ball 12 of the inner cylinder 10 act as a wall, compressing the elastic body 30 in the axial direction. As a result, the elastic body 30 is less likely to deform in the axial direction, and the axial rigidity of the vibration-damping bush 1 is high. On the other hand, the elastic body 30 is easily deformed in one twisting direction perpendicular to the axis, starting from the pillow ball 12 of the inner cylinder 10, so the rigidity of the vibration-damping bush 1 in the direction perpendicular to the axis (especially the twisting direction) is low.

[0045] In this way, by providing the pillow ball 12 on the outer circumferential surface 11 of the inner cylinder 10, the axial stiffness ratio with respect to the direction perpendicular to the axis (especially the twisting direction) of the vibration-damping bush 1 can be increased.

[0046] During the bending process, when the axial outer end 20b of the outer cylinder 20 is bent radially inward, the bent axial outer end 20b of the outer cylinder 20 presses against the protrusion 32 on the axial outer end 30b of the elastic body 30. As a result, the protrusion 32 of the elastic body 30 is pre-compressed in the axial direction, thereby increasing the axial rigidity of the vibration-damping bush 1.

[0047] Furthermore, during the bending process, the outer circumferential groove 33 at the axial outer end 30b of the elastic body 30 is filled, so not only the protrusion 32, but also the portion of the axial outer end 30b of the elastic body 30 where the outer circumferential groove 33 existed before the bending process is pressed against the axial outer end 20b of the bent outer cylinder 20 and pre-compressed in the axial direction (see Figure 6). As a result, the axial rigidity of the vibration-damping bush 1 can be further increased compared to the case where only the protrusion 32 is pre-compressed.

[0048] Since the outer peripheral groove 33 is provided at the axial outer end 30b of the elastic body 30, the range of deformation of the elastic body 30 in the direction perpendicular to the axis is increased. This makes it possible to suppress the occurrence of strain at the axial outer end 30b of the elastic body 30 when the vibration-damping bush 1 is displaced in the direction perpendicular to the axis.

[0049] When the outer cylinder 20's axial outer end 20b is bent radially inward during the bending process, a portion of the elastic body 30 is pushed out into the space 34 provided at its axial outer end 30b. By securing a region (volume compensation area, space 34) to allow the pushed-out elastic body 30 to escape, it is possible to prevent the axial outer end 30b of the elastic body 30 from protruding axially outward through the gap H (see Figure 6) between the inner cylinder 10 and the outer cylinder 20.

[0050] In summary, the axial stiffness ratio (axial stiffness / stiffness perpendicular to the axis, spring ratio) of the vibration-damping bush 1 can be increased, and strain and protrusion at the axial outer end 30b of the elastic body 30 can be suppressed.

[0051] Since the inner circumferential groove 35 is provided at the axial outer end 30b of the elastic body 30, the elastic body 30 becomes more easily deformable in the direction perpendicular to the axis, and the rigidity in the direction perpendicular to the axis of the vibration-damping bush 1 can be reduced. In other words, the ratio of axial rigidity to the direction perpendicular to the axis of the vibration-damping bush 1 can be increased. In addition, since the inner circumferential groove 35 functions similarly to the space 34, the protrusion of the axial outer end 30b of the elastic body 30 can be further suppressed.

[0052] Since the space portion 34 is formed in a convex arc shape that extends axially inward and radially outward, the extruded elastic body 30 can more easily escape into the space portion 34 compared to when the space portion 34 is formed in a rectangular shape of the same volume (it has a superior volume compensation effect).

[0053] Since the bending position P is located axially inward from the bottom 33a of the outer circumferential groove 33, the outer circumferential groove 33 of the elastic body 30 can be filled more reliably during the bending process.

[0054] Since the innermost axial portion 34a of the space 34 is located axially inward from the bottom 33a of the groove bottom of the outer peripheral groove 33, the space 34 can be made even larger. This further suppresses the protrusion of the outer axial end 30b of the elastic body 30.

[0055] Since the protruding portion 32 is formed in an annular shape over the entire circumference when viewed in the axial direction (see Figure 2), the area of ​​the portion that is pressed and pre-compressed by the axial outer end 20b of the bent outer cylinder 20 can be increased.

[0056] (Other embodiments) Although this disclosure has been described above with reference to preferred embodiments, this description is not limiting, and various modifications are, of course, possible.

[0057] In the above embodiment, as shown in Figure 2, the protrusion 32, outer circumferential groove 33, space 34, and inner circumferential groove 35 are formed in an annular shape over the entire circumference when viewed in the axial direction, but are not limited to this. Figure 7 is a diagram corresponding to Figure 2 in another embodiment. As shown in Figure 7, the protrusion 32, outer circumferential groove 33, space 34, and inner circumferential groove 35 may be provided only in a part of the circumferential direction when viewed in the axial direction (in this example, eight are provided intermittently in the circumferential direction). This makes it possible to prevent the axial outer end 30b of the elastic body 30 (especially the protrusion 32) from being excessively pre-compressed by the axial outer end 20b of the bent outer cylinder 20.

[0058] In the above embodiment, the inner cylinder 10, outer cylinder 20, and elastic body 30 were integrally molded by vulcanization, but the embodiment is not limited to this. The inner cylinder 10 and elastic body 30 may be integrally molded and then inserted into the outer cylinder 20 alone. In this case, the outer cylinder 20 is then drawn to further bend the axial outer end 20b of the outer cylinder 20 radially inward.

[0059] Only the pillow ball (bulge) 12 in the inner cylinder (inner member) 10 may be formed from a material other than metal, such as resin. Alternatively, the entire inner cylinder (inner member) 10 and the entire outer cylinder 20 may be formed from a material other than metal (for example, resin).

[0060] The material of the elastic body 30 is not rubber; for example, it may be polyurethane foam or the like.

[0061] The inner member 10 does not have to be cylindrical; it may also be axial (rod-shaped).

[0062] The axial outer end 30b of the elastic body 30 does not necessarily need to have an inner circumferential groove 35.

[0063] The pillow ball 12 does not need to be located at the axial center 10a of the outer circumferential surface 11 of the inner cylinder 10; it is sufficient if it is located axially inward from the axial outer end 10b (i.e., in the axial middle portion). The bulge 12 does not have to be spherical like the pillow ball; for example, it may be a convex shape such as an angular shape.

[0064] In the bending process, only a portion of the outer circumferential groove 33 may be filled, or the entire outer circumferential groove 33 may be filled. In other words, in the bending process, it is sufficient for at least a portion of the outer circumferential groove 33 to be filled.

[0065] In the above embodiment, as shown in Figure 3, a protrusion 32, an outer circumferential groove 33, a space 34, and an inner circumferential groove 35 are provided at the axial outer ends 30b on both sides of the elastic body 30, respectively, but the embodiment is not limited to this. The protrusion 32, outer circumferential groove 33, space 34, and inner circumferential groove 35 may be provided only at the axial outer end 30b on one side of the elastic body 30, while the protrusion 32, outer circumferential groove 33, space 34, and inner circumferential groove 35 may not be provided at the axial outer end 30b on the other side of the elastic body 30. Similarly, the bending process may be performed only at the axial outer end 20b on one side of the outer cylinder 20.

[0066] The vibration-damping bush (vibration-damping device) 1 may be used not only as a suspension bush for automobiles but also for other applications. [Industrial applicability]

[0067] This disclosure is extremely useful and has high industrial applicability because it can be applied to methods for manufacturing vibration isolation devices. [Explanation of symbols]

[0068] O center axis P bending position H gap 1. Vibration-damping bush (vibration-damping device) 10 Inner cylinder (inner component) 10a Axial center part (Axial middle part) 10b Axial outer end 11 Outer surface 12. Pillow ball (bulging part) 20 Outer cylinder 20a Axial center 20b Axial outer end 30 Elastic body 30a Axial center 30b Axial outer end 30c remaining part 31 Recess 32 Protrusion 33 Outer perimeter groove 33a Bottom 34 Space section 34a The innermost axial part 35 Inner circumferential groove 35a Bottom

Claims

1. The invention comprises a cylindrical or shaft-shaped inner member having an outer peripheral surface provided with a bulging portion bulging outward in the radial direction at an axially intermediate portion thereof, an outer cylinder disposed around the inner member, and an elastic body interposed between the inner member and the outer cylinder to connect them, The axially outer end of the elastic body is provided with a protruding portion protruding axially outward, an outer circumferential groove portion recessed axially inward radially outward from the protruding portion, and a space portion formed radially inward from the protruding portion. a preparation step of preparing an anti-vibration device; A method for manufacturing a vibration-damping device, comprising a bending process in which the axial outer end of the outer tube in the vibration-damping device is bent radially inward so as to press the protrusion and fill at least a portion of the outer peripheral groove portion.

2. 2. The method for manufacturing an anti-vibration device according to claim 1, A method for manufacturing a vibration-damping device, wherein an inner peripheral groove portion recessed axially inward is provided at the axial outer end portion of the elastic body, radially inside the space portion.

3. 3. The method for manufacturing an anti-vibration device according to claim 1 or 2, A method for manufacturing an anti-vibration device, wherein the space portion is formed in an arc shape that convex axially inward.

4. 4. The method for manufacturing an anti-vibration device according to claim 1, A method for manufacturing a vibration-damping device, wherein the bending position in the bending step is located axially more inward than the bottommost portion of the outer circumferential groove portion.

5. 5. The method for manufacturing an anti-vibration device according to claim 1, A method for manufacturing an anti-vibration device, wherein the axially innermost portion of the space portion is located axially inner than the bottommost portion of the outer peripheral groove portion.

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