JP2013117258A - Vibration damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damping device, in which constitution members can be reliably held.SOLUTION: A second bracket 14 of the vibration damping device 10 is connected with a vehicle body 16, and a leg part 50B provided to a cover body 50 is placed on the vehicle body 16 to make contact therewith. An outer mounting member 34 and the cover body 50 are held by being swaged by an edge of an annular part 60 of the second bracket 14, and since the leg part 50B supports a load even if the swaging part becomes incomplete, the outer mounting member 34 and the cover body 50 as constituent members of the vibration damping device 10 can be reliably supported.

Description

  The present invention relates to a vibration isolator that absorbs vibration of an engine or the like.

  An anti-vibration device having a structure for holding an anti-vibration main body in the case by inserting the anti-vibration main body into the case and caulking the lower end portion of the case has been proposed (for example, see Patent Document 1).

JP 2006-57847 A.

  In order to securely hold the vibration-proofing body in the case, the thickness of the caulking portion must be increased or the material of the case must be selected, which complicates design and manufacturing.

  In view of the above facts, an object of the present invention is to provide a vibration isolator capable of reliably holding the constituent members of the vibration absorbing means.

  The vibration isolator according to claim 1 is a vibration absorbing means provided between an attachment member connected to one of the vibration generating portion and the vibration receiving portion, and an annular outer member, and the outer member is disposed on the inner side. And a bracket connected to one of the vibration generating part and the vibration receiving part, and the outer member, the vibration generating part, and the vibration receiving part. And a load support member provided between them to support the load of the vibration generating portion.

The vibration isolator according to claim 1 is used, for example, by connecting the mounting member to a vibration generating part such as an engine and connecting the mounting part of the bracket to a vibration receiving part such as a vehicle body.
The load of the vibration generating unit is supported by the vibration receiving unit via the mounting member, the vibration absorbing unit, the outer member, and the bracket, and is received by the vibration receiving unit through the mounting member, the vibration absorbing unit, the outer member, and the load supporting member. Supported by the part.
Therefore, since the load of the vibration generating part can be supported on the vibration receiving part via the load support member in addition to the caulking part of the bracket, the support is ensured.

  The vibration isolator according to claim 1 may be used by reversing the attachment and connecting the bracket to a vibration generating part such as an engine and connecting the attachment member to a vibration receiving part such as a vehicle body.

  According to a second aspect of the present invention, in the vibration isolator according to the first aspect, the load supporting member is inserted into the housing portion of the bracket from below.

  In the vibration isolator according to claim 2, since the housing portion is provided in the bracket, and the load support member is inserted into the housing portion from below, the vibration received by the load support member is positioned below. It can be transmitted to the receiving part.

  According to a third aspect of the present invention, in the vibration isolator according to the second aspect, the vibration absorbing means is an elastic body that connects the mounting member and the outer member, and the elastic body is a part of the partition wall. A main liquid chamber that can be expanded and contracted, a sub liquid chamber that communicates with the main liquid chamber via a passage, and a diaphragm that forms a part of a partition wall of the sub liquid chamber, and the load support member includes: The cover body includes a leg portion connected to the outer member so as to surround an outer periphery of the diaphragm, and transmitting a load of the vibration generating portion to either one of the vibration generating portion and the vibration receiving portion.

In the vibration isolator according to the third aspect, when vibration is input from the vibration generating unit side, the elastic body as the main vibration absorber is elastically deformed, and the input vibration is attenuated and absorbed by the elastic deformation.
In addition, when vibration is input from the vibration generating unit side, the vibration isolator expands / contracts the internal volume of the main liquid chamber due to elastic deformation of the elastic body. Liquid flows between the liquid chambers through the passage. At this time, a liquid column resonance occurs in the passage, and a vibration isolation effect and a vibration suppression effect can be obtained by the liquid column resonance.

The load supporting member is a cover body connected to the outer member so as to surround the outer periphery of the diaphragm, and can protect the outer peripheral side of the diaphragm.
Since the cover body has a leg portion that transmits the load of the vibration generating portion to the other of the vibration generating portion and the vibration receiving portion, if the caulking portion of the bracket is incomplete, vibration is generated. The load of the part is supported to the vibration receiving part via the mounting member, the elastic body, the outer member, and the leg part of the cover body.

  According to a fourth aspect of the present invention, in the vibration isolator according to the third aspect, the accommodating portion has a larger diameter than the outer diameter of the outer member.

  In the vibration isolator according to the fourth aspect, the bracket is provided with an accommodating portion having a diameter larger than the outer diameter of the outer member. For this reason, a member larger in diameter than the outer member can be accommodated in the accommodating portion.

  According to a fifth aspect of the present invention, in the vibration isolator according to the third or fourth aspect, the leg portion has a bottom surface in contact with either the vibration generating portion or the vibration receiving portion, rather than the concave portion. Concave and convex portions having small convex portions are formed.

  In the vibration isolator according to claim 5, the leg portion is provided with an uneven surface having a convex shape smaller than the concave portion on the bottom surface contacting either the vibration generating portion or the vibration receiving portion. When the device is attached to the vibration generating part and the vibration receiving part, the convex part can be deformed, and a dimensional error between the leg part and any one of the vibration generating part and the vibration receiving part can be absorbed. .

  According to a sixth aspect of the present invention, in the vibration isolator according to the fifth aspect, the bottom surface has a plurality of convex portions that are in linear or dotted contact with either the vibration generating portion or the vibration receiving portion. Is formed.

  In the vibration isolator according to claim 6, when the vibration isolator is attached to the vibration generating portion and the vibration receiving portion, the vibration isolating device and the vibration receiving portion are in contact with either the vibration generating portion or the vibration receiving portion in a linear or dotted manner. The convex portion can be deformed, and a dimensional error between the leg portion and any one of the vibration generating portion and the vibration receiving portion can be absorbed.

  According to a seventh aspect of the present invention, in the vibration isolator of the sixth aspect, the cover body is formed of a synthetic resin, and the convex portion is formed of a synthetic resin that is softer than a portion other than the convex portion. Has been.

  In the vibration isolator according to the seventh aspect, since the convex portion is formed of a softer synthetic resin than the portion other than the convex portion, the convex portion is easily deformed.

  The invention according to claim 8 is the vibration isolator according to any one of claims 3 to 7, wherein the crimped portion and the leg portion are provided at different positions on the circumference.

  In the vibration isolator according to the eighth aspect, since the caulking portion and the leg are provided at different positions on the circumference, the caulking portion and the leg do not interfere with each other.

  According to a ninth aspect of the present invention, in the vibration isolator according to any one of the third to eighth aspects, the cover body is disposed below the outer member.

  In the vibration isolator according to the ninth aspect, since the cover body is disposed below the outer member, the load of the vibration generating portion is transmitted from the outer member to the lower cover body.

  According to a tenth aspect of the present invention, in the vibration isolator according to any one of the third to ninth aspects, the leg portion protrudes radially outward from below the outer member.

  In the vibration isolator according to claim 10, the load of the vibration generating portion can be transmitted to the radially outer side from directly below the outer member by projecting the leg portion radially outward from the lower side of the outer member. .

  An eleventh aspect of the present invention is the vibration isolator according to any one of the first to tenth aspects, wherein the bracket is configured such that the load supporting member is connected to either the vibration generating portion or the vibration receiving portion. Between them.

  In the vibration isolator according to the eleventh aspect, the load supporting member is sandwiched between the bracket and any one of the vibration generating portion and the vibration receiving portion.

  As described above, the vibration isolator according to claim 1 has an excellent effect that the components of the vibration isolator can be reliably held.

According to the vibration isolator of claim 2, the load of the vibration generating part can be supported by the caulking part of the bracket, and the load received by the load supporting member can be transferred to the vibration receiving part located below. Can communicate.

  According to the vibration isolator of Claim 3, the load of a vibration generation part can be supported by the leg part of a cover body.

  According to the vibration isolator of the fourth aspect, a member having a larger diameter than the outer member can be accommodated in the accommodating portion without interfering with the bracket.

  According to the vibration isolator of claims 5 to 7, the attachment member of the vibration isolator is connected to one of the vibration generator and the vibration receiver, and the bracket is either the vibration generator or the vibration receiver. It does not impede the mounting accuracy when connected to.

  According to the vibration isolator of Claim 8, interference with a crimping part and a leg part can be prevented.

  According to the vibration isolator of claim 9, the load of the vibration generating part can be transmitted from the outer member to the lower cover body.

  According to the vibration isolator of claim 10, for example, when a hole is opened directly below the outer member, the load of the vibration generating portion is a member radially outside the hole directly below the outer member ( Vibration receiving part).

  According to the vibration isolator of the eleventh aspect, the load supporting member is sandwiched and fixed between the bracket and any one of the vibration generating portion and the vibration receiving portion.

It is a disassembled perspective view of the vibration isolator which concerns on one Embodiment of this invention. It is the perspective view which made the cross section the part of the vibration isolator which concerns on one Embodiment of this invention. FIG. 3 is a sectional view of the vibration isolator shown in FIG. 2 taken along line 3-3. FIG. 4 is a sectional view taken along line 4-4 of the vibration isolator shown in FIG. It is a perspective view of a support ring. It is a bottom view of the vibration isolator which concerns on one Embodiment of this invention. It is an expanded sectional view near the leg part of the vibration isolator which concerns on one Embodiment of this invention. It is the perspective view seen from the bottom face side of the leg part of the vibration isolator which concerns on one Embodiment of this invention.

Hereinafter, a vibration isolator 10 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the vibration isolator 10 according to the present embodiment includes a vibration isolator body 12 and a second bracket 14.
The anti-vibration main body 12 is connected to the vehicle body 16 by a second bracket 14 and is connected to the engine by an arm-shaped first bracket 13 fixed to the engine (not shown).

As shown in FIGS. 2 and 3, the vibration isolation main body 12 includes an inner mounting member 18 formed of a steel plate. As shown in FIG. 3, the inner mounting member 18 includes a lower member 20 and an upper member 22 joined to the lower member 20.
The upper member 22 includes a pair of vertical wall portions 28 that are parallel to each other, and the upper ends of the pair of vertical wall portions 28 are connected by a connecting wall portion 30.
Therefore, the inner mounting member 18 includes an upper surface 20 </ b> A (see FIG. 4, not shown in FIGS. 2 and 3), a pair of vertical wall portions 28, and a connecting wall portion 30. A rectangular cylindrical fixing portion 32 having a horizontal through-hole orthogonal to the axial (S) direction is formed.

  As shown in FIG. 3, an outer mounting member 34 having a substantially cylindrical shape is disposed below the inner mounting member 18 coaxially with the inner mounting member 18. The vibration isolator 10 is installed on the vehicle body 16 so that the main vibration from the vibration generator is input in the axial (S) direction.

  An elastic body 36 such as rubber is vulcanized and bonded to the inner peripheral surface of the outer mounting member 34 and the inner and outer surfaces of the inner mounting member 18. By this elastic body 36, the inner attachment member 18 and the outer attachment member 34 are elastically connected. The elastic body 36 is formed thick between the inner mounting member 18 and the outer mounting member 34, and this thick portion mainly absorbs vibration.

  As shown in FIG. 4, the elastic body 36 is integrally formed with a bound stopper portion 36 </ b> B extending outward in the horizontal direction along the lower surface of the first bracket 13.

  As shown in FIG. 3, an orifice member 38 is disposed below the outer mounting member 34. In the orifice member 38, an orifice passage 40 is formed over the circumference along the circumferential direction around the axis S.

An opening 42 penetrating in the vertical direction is formed on the center side of the orifice member 38, and a rubber membrane 44 is provided in the orifice member 38 so as to close the opening 42.
A portion of the upper surface of the orifice member 38 is in close contact with the lower end of the outer mounting member 34 and the lower end of the elastic body 36.

A diaphragm 46 is disposed below the orifice member 38.
A cover body 50 is disposed on the outer peripheral side of the diaphragm 46 so as to surround the outer periphery of the diaphragm 46. An outer mounting member 34 is inserted above the cover body 50. The cover body 50 is made of a fiber reinforced synthetic resin, but may be made of other materials such as metal.

As shown in FIG. 7, an annular rib 34A protruding outward in the radial direction is formed on the outer peripheral surface slightly below the intermediate portion in the axial direction of the outer mounting member 34, and this rib 34A is formed as a cover body. The cover body 50 is fixed to the outer mounting member 34 by fitting into the 50 grooves 50A.
A part of the outer peripheral portion of the orifice member 38 and the outer peripheral end portion of the diaphragm 46 are sandwiched and fixed between the lower end of the outer mounting member 34 and the cover body 50.

As shown in FIGS. 3 and 5, the cover body 50 is integrally formed with a pair of legs 50 </ b> B extending downward from the lower end of the annular portion 50 </ b> A and projecting radially outward from the lower side of the outer mounting member 34. Is formed. The leg portion 50 </ b> B is sandwiched between the second bracket 14 and the vehicle body 16.
As shown in FIGS. 6 and 7, a plurality of small ribs 51 as convex portions are integrally formed on the bottom surface of the leg portion 50B, and the bottom surface of the leg portion 50B has an uneven shape. . As shown in FIG. 7, the convex portion is smaller than the concave portion, and the small rib 51 that is the convex portion is in linear contact with the upper surface of the vehicle body 16.

  As shown in FIG. 3, a space surrounded by the elastic body 36 and the orifice member 38 is a main liquid chamber 52, and a space surrounded by the diaphragm 46 and the orifice member 38 is a sub liquid chamber 54. 52, the sub-liquid chamber 54, and the orifice passage 40 are filled with a liquid such as water, ethylene glycol, or oil.

  As shown in FIG. 4, the orifice member 38 is provided with a through hole 56 that communicates one end side of the orifice passage 40 with the main liquid chamber 52. As shown in FIG. A through hole 58 that communicates the end side and the auxiliary liquid chamber 54 is formed. Therefore, the main liquid chamber 52 and the sub liquid chamber 54 are communicated with each other via the orifice passage 40.

(Body mounting bracket)
As shown in FIGS. 1 and 3, the second bracket 14 has a pair of support columns 62 that extend in the axial direction upward and parallel to each other on a main body insertion portion 60 as a substantially cylindrical annular portion. And the outer stopper member 66 comprised including the connection part 64 which connects the upper ends of these pair of support | pillar parts 62 is provided integrally.
The anti-vibration main body 12 is disposed in a space A surrounded by the main body insertion portion 60 and the outer stopper member 66.
In addition, although the 2nd bracket 14 of this embodiment is an aluminum alloy casting (die casting), it may be formed with another material.

  The anti-vibration main body 12 is inserted into the second bracket 14 from the lower side of the main body insertion portion 60 with the inner mounting member 18 first (see FIG. 1. The inner mounting member 18 is covered with an elastic body 36. (In FIG. 1, it is indicated by a dotted line.)

  As shown in FIG. 3, the main body insertion portion 60 is formed with a circular large-diameter portion 67A (housing portion of the present invention), a medium-diameter portion 67B, and a small-diameter portion 67C in this order from the bottom. The outer mounting member 34 of the vibration isolating body 12 is press-fitted into the middle diameter portion 67B, and the distal end portion in the press-fitting direction of the outer mounting member 34 abuts on a step formed by the middle diameter portion 67B and the small diameter portion 67C. .

As shown in FIGS. 1, 4, and 6, a pair of thin caulking portions 68 are integrally formed at a lower portion of the main body insertion portion 60 of the second bracket 14. The caulking part 68 supports the outer peripheral part and the lower end part of the annular part 50A of the cover body 50 of the vibration isolating body 12 by being caulked inward in the radial direction (bending deformation). The vibration-proof main body 12 is prevented from coming off from the main body insertion portion 60.
In addition, as shown in FIG. 6, the leg part 50B is arrange | positioned between the caulking part 68 and the caulking part 68, and the caulking part 68 and the leg part 50B are arrange | positioned in the different position on the circumference. .

As shown in FIGS. 2 and 3, the main body insertion portion 60 of the second bracket 14 is integrally provided with leg-like attachment portions 70 and 72, and these attachment members 70 and 72 include Each of the connecting holes 74 is formed.
The second bracket 14 is fixed in a state where the bottom surfaces of the attachment portions 70 and 72 are in contact with the upper surface of the vehicle body 16 by screwing the nuts 78 into the bolts 76 through which the connection holes 74 are inserted.
In addition, in this embodiment, the upper surface of the vehicle body 16 which the edge part (top part) of the small rib 51 of the leg part 50B and the bottom face of the attaching parts 70 and 72 contact is made into a horizontal planar shape. Therefore, in the present embodiment, the leg portion 50B has an end portion of the small rib 51 that is a contact surface to the upper surface of the vehicle body 16 at the same surface position as the bottom surfaces of the mounting portions 70, 72 of the second bracket 14. (Top) is formed.

(Function)
Next, the operation of the vibration isolator 10 according to this embodiment will be described.
In order to assemble the vibration isolator 10 according to the present embodiment, first, as shown in FIG. 1, the vibration isolating body 12 is first placed with the inner mounting member 18 side first with respect to the body insertion portion 60 of the second bracket 14. insert.

Then, after inserting the outer mounting member 34 of the vibration isolating body 12 until it abuts against the step formed by the medium diameter portion 67B and the small diameter portion 67C of the second bracket 14, the thin caulking portion 68 is inserted. It is deformed inward in the radial direction and crimped.
As a result, the caulking portion 68 is pressed against the outer peripheral portion and the lower end portion of the cover body 50 of the vibration-proof main body 12, and the vibration-proof main body 12 is prevented from coming off from the main body insertion portion 60.

  In the state where the vibration isolating body 12 is attached to the second bracket 14, as shown in FIG. 3, the fixing portion 32 is in the space A surrounded by the body insertion portion 60 and the outer stopper member 66 of the second bracket 14. Arranged inside.

  The anti-vibration device 10 having the anti-vibration main body 12 attached to the second bracket 14 in this way is attached to the vehicle body 16 as a vibration receiving portion using bolts 76 and nuts 78 as shown in FIG.

Further, the first bracket 13 is attached to the engine as the vibration generating portion, and the first bracket 13 is press-fitted into and fitted into the fixing portion 32 of the vibration isolator 10.
When an engine load acts on the vibration isolator 10, the elastic body 36 is compressed, and the position of the first bracket 13 is displaced downward from the position shown in FIG.

  The engine load is supported in the order of the first bracket 13, the inner mounting member 18, the elastic body 36, the outer mounting member 34, the cover body 50, the crimping portion 68 (second bracket 14), and the vehicle body 16. The first bracket 13, the inner mounting member 18, the elastic body 36, the outer mounting member 34, the cover body 50, the leg portion 50 </ b> B of the cover body 50, and the vehicle body 16 are supported in this order.

Here, most of the engine load is normally supported by the vehicle body 16 via the caulking portion 68 (second bracket 14).
If the caulking portion 68 of the second bracket 14 is incomplete due to damage or the like, and the caulking portion 69 can no longer support the engine load, the engine load is applied to the first bracket 13 and the inner side. It is supported by the vehicle body 16 via the attachment member 18, the elastic body 36, the outer attachment member 34, and the leg portion 50 </ b> B of the cover body 50. Therefore, the anti-vibration main body 12 does not shift downward with respect to the second bracket 14, and the support is ensured.

  Since the synthetic resin leg portion 50B has a small rib 51 formed on the bottom surface that contacts the vehicle body 16, the small rib 51 is deformed when the second bracket 14 of the vibration isolator 10 is attached to the vehicle body 16. Therefore, a dimensional error between the leg portion 50B and the vehicle body 16 can be absorbed.

  In the vibration isolator 10, when vibration is input from the engine side, the elastic body 36, which is the main vibration absorber, is elastically deformed. Due to this elastic deformation, the input vibration is attenuated and absorbed.

  Further, in the vibration isolator 10, when vibration in a relatively low frequency range, such as shake vibration, is input from the engine, the internal volume of the main liquid chamber 52 expands / contracts due to elastic deformation of the elastic body 36, and the main liquid chamber With the expansion and contraction of the liquid 52, the liquid flows between the main liquid chamber 52 and the sub liquid chamber 54 through the orifice passage 40. At this time, a liquid column resonance occurs in the orifice passage 40, and a vibration isolation effect and a vibration suppression effect can be obtained by the liquid column resonance or the like.

  On the other hand, when vibration in a relatively high frequency range, such as idle vibration, is input to the vibration isolator 10 from the engine, the orifice passage 40 is clogged. At this time, the membrane 44 is elastically deformed so as to expand and contract the volume in the main liquid chamber 52. As a result, an increase in the hydraulic pressure in the main liquid chamber 52 is suppressed and an increase in the dynamic spring constant can be suppressed, so that vibrations in a high frequency range can also be effectively absorbed.

[Other Embodiments]
In the above embodiment, the number of leg portions 50B is two, but may be three or more. Note that the number, shape, and size of the leg portions 50B are arbitrary.
In the above embodiment, the plurality of small ribs 51 are formed on the bottom surface of the leg portion 50B. However, the bottom surface of the leg portion 50B only needs to have an uneven shape. For example, as shown in FIG. Instead, convex portions of other shapes such as a truncated cone-shaped convex portion 80 that contacts in a dot shape may be formed integrally with the leg portion 50B. In addition, the magnitude | size and number of a convex part are arbitrary.

  In the above embodiment, the small rib 51 and the convex portion 80 are integrally formed with the leg portion 50B, but the small rib 51 and the convex portion 80 are a synthetic resin forming the cover body 50. It can also be formed of a softer synthetic resin. By forming the small ribs 51 and the convex portions 80 with a synthetic resin softer than the synthetic resin forming the cover body 50, the small ribs 51 and the convex portions 80 are easily deformed. “Soft” here means, as an example, that the value of hardness is small according to the Rockwell hardness test method for plastics of JIS K 7202.

  In the above embodiment, the end (top) of the small rib 51 of the leg portion 50B and the bottom surfaces of the attachment portions 70 and 72 are in contact with the upper surface of the vehicle body 16 that is in a horizontal plane shape. A step portion having a height difference may be formed on the upper surface, and the end portion (top portion) of the small rib 51 of the leg portion 50B and the attachment portions 70 and 72 may not be in the same plane and may have different height positions.

  In the present embodiment, the vibration isolator 10 has a so-called liquid-sealed vibration absorbing means. However, the vibration isolating apparatus 10 is not limited to this embodiment, and may be other vibration absorbing means.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be implemented with various modifications of the vibration isolator 10 without departing from the spirit of the present invention. Of course.

10 Vibration isolator 14 Second bracket (bracket)
16 Body (vibration receiver)
18 Inner mounting member (Mounting member)
34 Outer mounting member (outer member)
36 Elastic body (vibration absorbing means)
40 Orifice passage (passage, vibration absorbing means)
46 Diaphragm (vibration absorbing means)
50 Cover body (load support member)
51 Small rib (convex)
50B Leg (load support member)
52 Main liquid chamber (vibration absorbing means)
54 Secondary liquid chamber (vibration absorbing means)
60 Main body insertion part (annular part)
67A Large diameter part (accommodating part)
70 Mounting part 72 Mounting part 80 Convex part

Claims (11)

A vibration absorbing means provided between an attachment member connected to one of the vibration generating part and the vibration receiving part, and an annular outer member;
The outer member is accommodated so as to be held inside and supported by a caulking portion, and a bracket connected to either the vibration generating portion or the vibration receiving portion;
A load support member provided between the outer member and any one of the vibration generating unit and the vibration receiving unit and capable of supporting the load of the vibration generating unit;
Anti-vibration device with   The vibration isolator according to claim 1, wherein the load support member is inserted into the housing portion of the bracket from below. The vibration absorbing means is connected to the elastic body that connects the mounting member and the outer member, the main liquid chamber that can be expanded and contracted using the elastic body as a part of the partition wall, and the main liquid chamber via a passage. A sub liquid chamber, and a diaphragm that forms a part of a partition wall of the sub liquid chamber,
The load support member is a cover body that is connected to the outer member so as to surround the outer periphery of the diaphragm, and includes a leg portion that transmits the load of the vibration generating portion to either one of the vibration generating portion and the vibration receiving portion. The vibration isolator according to claim 2.   The vibration isolator according to claim 3, wherein the housing portion has a larger diameter than the outer diameter of the outer member.   5. The uneven portion having a convex shape smaller than the concave portion is formed on the bottom surface of the leg portion that is in contact with either the vibration generating portion or the vibration receiving portion. Anti-vibration device.   The anti-vibration device according to claim 5, wherein a plurality of convex portions that are linearly or dottedly contacted with either one of the vibration generating portion and the vibration receiving portion are formed on the bottom surface.   The vibration isolator according to claim 6, wherein the cover body is formed of a synthetic resin, and the convex portion is formed of a synthetic resin that is softer than a portion other than the convex portion.   The vibration isolator according to any one of claims 3 to 7, wherein the crimped portion and the leg portion are provided at different positions on the circumference.   The vibration isolator according to any one of claims 3 to 8, wherein the cover body is disposed below the outer member.   The vibration isolator according to any one of claims 3 to 9, wherein the leg portion projects radially outward from below the outer member.   The vibration isolator according to any one of claims 1 to 10, wherein the bracket holds the load support member between one of a vibration generating unit and a vibration receiving unit.

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