JP2005076751A - Cylindrical vibration-isolating mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical vibration-isolating mount capable of properly preventing the deformation of a flange part even in press-fitting operation by pressing the taper-shaped flange part by a press-fitting tool, and being surely press-fitted to a target press-fitting position. <P>SOLUTION: In this cylindrical vibration-isolating mount having an outer cylindrical member 12, an inner cylindrical member 14 and an elastic part composed of a rubber elastic body, provided with the expanded taper-shaped flange part 42 on the outer cylindrical member 12, and being axially press-fitted to a cylindrical body 36 of a mating bracket 34 at the outer cylindrical member 12, a plurality of reinforcement ribs 46 formed by axially projecting a part of the flange part 42 to a cylindrical body 36 side are formed along the circumferential direction at specific intervals, and the reinforcement ribs 46 are seated on an axial end face of the cylindrical body 36 in the press-fitting to regulate the press-fitting position of the outer cylindrical member 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an anti-vibration mount used as an engine mount and the like, and more particularly, to a cylindrical anti-vibration mount including a rigid outer cylinder member and an inner cylinder member, and an elastic portion made of a rubber elastic body connecting them.

  Conventionally, a cylindrical anti-vibration mount as an anti-vibration mount, that is, a cylindrical anti-vibration having a rigid outer cylinder member and an inner cylinder member, and an elastic portion made of a rubber elastic body connecting the outer cylinder member and the inner cylinder member. Mounts are used as engine mounts for automobiles.

  In this kind of cylindrical vibration-proof mount, a flange portion is provided at one axial end portion of the rigid outer cylinder member, and the flange portion extends radially outward at an angle perpendicular to the axis. There are two types, one is a shape and the other is a shape that tapers and expands outward in the radial direction, both of which are usually press-fitted axially into the cylinder of the mating bracket in the outer cylinder member and attached to the mating bracket It is done.

  At that time, especially in the case of the latter cylindrical vibration-proof mount with the flange portion expanding in a taper shape, when the outer peripheral end of the flange portion is pressed in the axial direction with a press-fitting jig and pressed into the cylinder of the mating bracket, There is a problem that since the flange portion that expands in a tapered shape is weak, the flange portion is likely to be deformed and it is difficult to press-fit well.

FIG. 6 shows a specific example.
The cylindrical anti-vibration mount of this example is an example of a liquid-sealed cylindrical anti-vibration mount in which liquid is sealed in the liquid chamber, and 200 in the figure represents the cylindrical anti-vibration mount.

  The cylindrical vibration-proof mount 200 includes a rigid outer cylinder member 202 made of a metal fitting, a rigid inner cylinder member 204 also made of a metal fitting, and an elastic portion 206 made of a rubber elastic body that elastically connects them. The first liquid chamber 208 and the second liquid chamber 210 and the orifice passage 212 for communicating them are formed in the interior.

In this cylindrical vibration-proof mount, a tapered flange portion 214 is provided at one end portion of the outer cylinder member 202 in the axial direction.
On the other hand, the inner cylindrical member 204 is provided with a rigid restraining plate 216 that is radially outwardly spread at one end in the axial direction on the same side as the flange portion 214, and the tapered flange portion 214 and the restraining plate are provided. A rubber elastic body 206 </ b> A constituting a part of the elastic portion 206 is disposed between the elastic member 206 and the elastic member 206.

  In the rubber elastic body 206A disposed between the flange portion 214 and the restraint plate 216, the outer surface 218 on the restraint plate 216 side forms a substantially tapered surface opposite to the flange portion 214, and the outer surface 218 and the restraint plate Between the outer peripheral portion of 216, a straight portion 220 whose axial width gradually decreases toward the axial center side is formed in an annular shape continuously in the circumferential direction.

  In this cylindrical vibration-proof mount 200, the flange portion 214 of the outer cylinder member 202 is tapered, and the rubber elastic body 206A is disposed between the tapered flange portion 214 and the restraining plate 216. When the inner cylinder member 204 moves relative to the outer cylinder member 228 in the downward direction in the figure, the rubber elastic body 206A is pushed downward with deformation, thereby changing the volume of the liquid chamber and causing the internal liquid to flow. The aim is to effectively flow, that is, to ensure good damping due to the flow of the liquid.

  Reference numeral 222 denotes a press-fitting jig for press-fitting the cylindrical vibration-proof mount 200 into the cylindrical body 226 of the mating bracket 224. To assemble the cylindrical vibration-proof mount 200 to the mating bracket 224, the press-fitting jig 222 is used as an outer cylinder. The member 202 is pressed against the outer peripheral end portion of the flange portion 214 to apply a downward force in FIG. 6, and the press-fitting jig 222 is moved downward by a predetermined stroke so that the root portion of the flange portion 214, that is, the inner peripheral end thereof is a cylinder. This is press-fitted into the cylindrical body 226 to a position where it contacts the axial end of the body 226.

  However, as described above, the tapered flange portion 214 is weak in strength, and the press-fitting jig 222 is pressed against the outer peripheral end portion of the flange portion 214 to apply downward pressure, so that the flange portion 214 is deformed during press-fitting. If such deformation occurs, insufficient press-fitting occurs, and the cylindrical vibration-proof mount 200 is not assembled at a predetermined position in the cylindrical body 226 of the mating bracket 224, or the cylindrical vibration-proof mount 200 is not attached. There arises a problem that desired desired vibration isolation characteristics cannot be obtained.

In addition, there exist some which were disclosed by the following patent document 1, patent document 2, and patent document 3 as a prior art considered to be related to this invention.
The one disclosed in Patent Document 1 relates to a cylindrical vibration-proof mount used for an automobile suspension or the like, and is provided with a rib having a shape in which a flange portion is partially recessed and protruded on the opposite side, and the rib has a reinforcing effect. However, the flange portion does not have a tapered shape like the cylindrical vibration-proof mount of the present invention, and is different from the present invention in its object.

  Although what is disclosed in Patent Document 2 also relates to a cylindrical vibration-proof mount, this cylindrical vibration-proof mount also has a flange portion that does not have a tapered shape, and is different from the subject of the present invention.

  On the other hand, the one disclosed in Patent Document 3 is also related to a cylindrical vibration-proof mount, and an inclined plate portion is provided on the flange portion of the outer cylinder member. The inclined plate portion is perpendicular to the axis. In addition to the fact that the cylindrical anti-vibration mount itself provided with the inclined plate portion is different from the object of the present invention, the inclined plate portion is provided in a form protruding upward from the flange portion. Therefore, the problem that is the subject of the present invention cannot be solved.

Japanese Patent No. 2981598 Japanese Patent No. 2944989 JP 2002-295560 A

  In the present invention, against the background as described above, even when the press-fitting operation is performed by pressing the tapered flange portion with a press-fitting jig, the deformation of the flange portion is prevented well, and the target press-fitting position is surely achieved. The object of the present invention is to provide a cylindrical anti-vibration mount that can be press-fitted and can be satisfactorily assembled to a mating bracket and that can exhibit good anti-vibration characteristics.

  Thus, the present invention has a rigid outer cylinder member and inner cylinder member, and an elastic portion made of a rubber elastic body connecting the outer cylinder member and the inner cylinder member. One end in the axial direction is provided with a tapered flange that expands in diameter in the axial direction away from the other end, and the outer cylindrical member is press-fitted in the axial direction into the cylinder of the mating bracket. In the cylindrical vibration-proof mount held in the fitted state, a part of the flange portion is protruded in the axial direction toward the cylindrical body side of the mating bracket, and is seated on the axial end surface of the cylindrical body during press-fitting. A plurality of reinforcing ribs defining the press-fitting position of the outer cylinder member are provided at predetermined intervals along the circumferential direction.

  According to a second aspect of the present invention, in the first aspect, the reinforcing rib is provided between the inner peripheral end and the inner peripheral end of the taper-shaped flange portion that is drawn in the axial direction from the outer peripheral end. The outer peripheral end of the part is continuous in an annular shape without a step in the circumferential direction.

  A third aspect of the present invention is characterized in that, in any one of the first and second aspects, an end surface of the reinforcing rib on the cylindrical body side is a surface substantially perpendicular to the axis of the outer cylindrical member. .

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a rigid constraining plate extending radially outward is provided at a shaft end on the flange portion side of the inner cylindrical member, and the constraining Between the plate and the tapered flange portion, rubber elasticity forming a part of the elastic portion is pushed and deformed in the direction along with the relative displacement in the axial direction of the restraint plate toward the flange portion. A body is disposed, and a liquid chamber in which liquid is sealed is formed in the axially inner part of the elastic body.

  According to a fifth aspect of the present invention, the rubber elastic body positioned between the flange portion and the restraint plate according to the fourth aspect is configured such that the outer surface on the restraint plate side is a substantially tapered surface opposite to the tapered flange portion. A straight portion having a gradually decreasing axial width toward the axial center is formed between the outer surface and the outer peripheral portion of the restraining plate in an annular shape continuously in the circumferential direction. It is characterized by.

Effects and effects of the invention

  As described above, according to the present invention, a plurality of reinforcing ribs in a form in which a part of the tapered flange portion is protruded in the axial direction toward the cylindrical body of the mating bracket are provided at predetermined intervals along the circumferential direction, and the reinforcing ribs are provided. Is seated on the axial end surface of the cylindrical body of the mating bracket so as to act as a positioning portion that regulates the press-fitting position, that is, the press-fitting amount. It is possible to satisfactorily prevent the taper flange portion from being deformed by the reinforcing effect of the reinforcing rib when it is press-fitted in the axial direction into the cylinder of the mating bracket.

  Moreover, since the reinforcing rib serves to regulate the press-fitting amount by being seated on the cylinder, according to the present invention, when the cylindrical vibration-proof mount is press-fitted into the cylinder, the cylinder is surely set to a predetermined set position. The anti-vibration mount can be press-fitted and can be assembled well, and the deformation of the flange part is prevented, so that the cylindrical anti-vibration mount can exhibit the desired anti-vibration characteristics after assembly. Can do.

In the present invention, when the cylindrical vibration-proof mount is press-fitted into the cylinder body of the mating bracket, the press-fitting can be terminated when the pressing load during the press-fitting reaches the set load.
That is, instead of the control by the pressing stroke of the press-fitting jig, the control by the pressing load can be performed.

In the present invention, the reinforcing rib can be provided between an inner portion drawn from the outer peripheral end of the tapered flange portion toward the axial center and the inner peripheral end, that is, the root of the flange portion. ).
It is possible to provide the reinforcing rib up to the straight cylinder part that is straight in the axial direction beyond the inner peripheral end of the flange part, that is, to extend from the tapered flange part to the straight cylinder part. In this case, when the straight tube portion is drawn, there is a problem that the range in which drawing can be performed is limited due to the presence of the reinforcing rib.
However, when the reinforcing rib is provided only in the tapered flange portion according to the second aspect, the straight tube portion of the outer tube member can be satisfactorily drawn over the entire length without causing such inconvenience.

  Next, a third aspect of the present invention is such that the end surface of the reinforcing rib on the cylinder side is a surface substantially perpendicular to the axis of the outer cylinder member, and when the reinforcing rib is provided in such a form, When the reinforcing rib is seated on the end surface in the axial direction of the cylindrical body of the mating bracket, it can be stably seated over a wide contact area, and the press-fitting position can be regulated more favorably by the reinforcing rib.

In the present invention, a rigid restraint plate is provided at the shaft end of the inner cylindrical member, and a rubber elastic body forming a part of the elastic portion is disposed between the restraint plate and the tapered flange portion. Further, the present invention is effective when applied to a cylindrical vibration-proof mount in which a liquid chamber in which liquid is sealed is formed at the back in the axial direction (claim 4).
In the case of such a cylindrical vibration-proof mount, if the tapered flange portion is deformed by press-fitting, the deformation amount of the rubber elastic body for changing the volume of the liquid chamber is affected, and the damping effect due to the flow of the liquid However, according to the present invention, such a problem can be solved satisfactorily.

  The present invention is also suitable for a cylindrical vibration-proof mount having a straight portion between the rubber elastic body and the outer peripheral portion of the restraining plate that gradually decreases in the axial direction toward the axial center. Applicable (Claim 5).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 5, reference numeral 10 denotes an engine mount as a liquid-sealed cylindrical anti-vibration mount of the present embodiment, which is a rigid and cylindrical outer cylinder member 12 made of metal fittings, and a rigid and cylindrical shape made of metal fittings. Of the first liquid chamber 18 and the second liquid chamber 20 and an orifice passage for communicating them. 22 is formed.

Here, the first liquid chamber 18 and the second liquid chamber 20 are partitioned by a partition wall 24 made of a rubber elastic body.
The lower wall of the second liquid chamber 20 in the figure is a flexible diaphragm wall 26 made of a rubber elastic body.

The orifice passage 22 is formed by an orifice fitting 23 embedded therein.
The orifice passage 22 has an upper annular first passage 22-1 and a lower annular second passage 22-2 in FIG.

As shown in FIG. 4, the upper first passage 22-1 communicates with the first liquid chamber 18 at the opening 28, and the lower second passage 22-2 passes through the opening 30. It communicates with the second liquid chamber 20.
Further, the first passage 22-1 and the second passage 22-2 are connected to each other through a communication passage 32 extending obliquely as shown in FIG. 4.

That is, the liquid in the first liquid chamber 18 flows into the first passage 22-1 from the opening 28, then flows along the circumferential direction of the first passage 22-1, and passes through the communication passage 32 to the second lower side. After flowing into the passage 22-2, it further flows in the circumferential direction and then flows out from the opening 30 to the second liquid chamber 20.
Further, the liquid in the second liquid chamber 20 moves to the first liquid chamber 18 through a path in the opposite direction.

Reference numeral 34 denotes a mating bracket to which the engine mount 10 is to be attached by press-fitting. A cylindrical body 36 is integrally formed.
The mounting bracket 34 has a fixing hole 40 through which the mounting bolt 38 is inserted.

A tapered flange portion 42 is provided at one axial end portion (upper end portion in the figure) of the outer cylinder member 12 and the diameter of the outer cylindrical member 12 increases as the distance from the other end portion (lower end portion in the figure) increases in the axial direction. Yes.
Here, the outermost peripheral end portion 44 of the flange portion 42 is formed in a form that is partially bent horizontally in FIG.

In the present embodiment, the tapered flange portion 42 is provided with a plurality of reinforcing ribs 46 that are partially projected in the axial direction toward the cylindrical body 36 of the mating bracket 34 at predetermined intervals along the circumferential direction. It is.
Here, a total of eight such reinforcing ribs 46 are provided at 45 ° intervals as shown in FIGS.
Here, each reinforcing rib 46 has a vertical wall portion 48 extending in the axial direction and a bottom portion 50 extending in a direction perpendicular to the axial center, and a recessed portion 49 (see FIG. 1) is formed inside thereof. .

In the present embodiment, each reinforcing rib 46 is provided from a position slightly pulled from the outer peripheral end of the flange portion 42 toward the axial center side to a root portion thereof, specifically, a boundary portion with the straight tube portion 64 in the outer tube member 12. Yes.
Here, the straight tube portion 64 has a cylindrical shape extending straight in the axial direction.

At the upper end of the inner cylinder member 14, that is, the axial end of the outer cylinder member 12 on the same side as the flange portion 42, a rigid disc-shaped restraining plate 52 made of a metal fitting having a radially outward form is provided. ing.
A rubber elastic body 16 </ b> A that constitutes a part of the elastic portion 16 is disposed between the tapered flange portion 42 in the outer cylinder member 12 and the constraining plate 52.

The rubber elastic body 16A disposed between the flange portion 42 and the restraint plate 52 is configured to obliquely connect the flange portion 42 and the upper portion of the inner cylinder member 14 and the restraint plate 42 over the entire circumference. ing.
The rubber elastic body 16 </ b> A disposed between the flange portion 42 and the restraint plate 52 has a substantially tapered surface in which the outer surface 56 on the restraint plate 52 side is inclined in the direction opposite to the flange portion 42.

Between the outer surface 56 of the rubber elastic body 16A and the outer peripheral portion of the restraining plate 52, a straight portion 58 whose axial width gradually decreases toward the axial center is formed in an annular shape continuously in the circumferential direction. Has been.
The tapered flange portion 42 is almost entirely covered with the rubber elastic body 16A, but the horizontally bent outermost peripheral end portion 44 is not covered with rubber, and the flange portion 42 is Exposed.

  In this embodiment, the rubber elastic body 16 </ b> B is also filled in the recessed portion 49 inside the reinforcing rib 46 provided in the flange portion 42. Further, at the axial position where these reinforcing ribs 46 are provided, the flange portion 42. The inner cylinder member 14 is filled with a rubber elastic body 16A over the entire circumference.

  As a result, the spring constant in the direction perpendicular to the axis may be slightly different between the portion where the reinforcing rib 46 is provided and the portion where the reinforcing rib 46 does not exist. Since there is a great deal of dispersion in the direction, there is substantially no such effect, and the spring constant in the direction perpendicular to the axis is substantially equal between the portion where the reinforcing rib 46 is provided and the portion where the reinforcing rib 46 is not provided. is there.

  In the engine mount 10 of the present embodiment, when the inner cylinder member 14 is relatively displaced downward in the figure with respect to the outer cylinder member 12, the tapered flange portion 42 of the outer cylinder member 12 and the inner cylinder member 14 in the figure are shown. The rubber elastic body 16A between the upper end restraining plate 52 and the elastic plate 16A is pushed downward in the drawing with deformation, whereby the volume of the first liquid chamber 18 is reduced and the liquid in the first liquid chamber 18 is changed to the orifice. It is pushed out through the passage 22 to the second liquid chamber 20 side.

That is, since the flange portion 42 of the outer cylinder member 12 has a tapered shape, and further, a restraint plate 52 is provided at the upper end of the inner cylinder member 14, the inner cylinder member 14 is relatively displaced downward in the figure. When this is done, the rubber elastic body 16A is effectively extruded and deformed downward in the figure.
The volume of the deformation is large, and the liquid in the first liquid chamber 18 is effectively and forcibly caused to flow toward the second liquid chamber 20 through the orifice passage 22 by the pump action due to the deformation.
A large vibration damping effect is obtained based on the flow of the liquid at that time.

  As shown in FIG. 1, the engine mount 10 of this example presses the press-fitting jig 60 against the outermost peripheral end portion 44 of the flange portion 42 of the outer cylinder member 12 and pushes it downward, so that the outer cylinder member 12 is It press-fits into the cylinder 36 of the mating bracket 34 and is assembled to the mating bracket 34.

  At that time, as described above, since the flange portion 42 has a tapered shape as described above, there is a problem in that the flange portion 42 tends to be deformed. Since the reinforcing ribs 46 are reinforced by a plurality of dispersed ribs, the flange portion 42 is prevented from being deformed during press-fitting.

  Further, since the press-fitting position is determined by the reinforcing rib 46 coming into contact with the axial end surface of the cylindrical body 36, according to the present embodiment, when the engine mount 10 is press-fitted into the mating bracket 34, the desired press-fitting position is surely reached. This can be press-fitted.

In the engine mount 10, after the vulcanization, the outer cylinder member 12 is drawn in the diameter reducing direction before being pressed into the mating bracket 34.
The engine mount 10 is press-fitted into the cylindrical body 36 of the mating bracket 34 after such drawing processing.

  As described above, in the present embodiment, since the engine mount 10 can be press-fitted to a target position with certainty, the engine mount 10 can exhibit desired vibration isolation characteristics after assembly.

In this example, when the reinforcing rib 46 comes into contact with the end face in the axial direction of the cylindrical body 36, the indentation load, that is, the press-fit load increases rapidly. Therefore, the press-fit operation is terminated by monitoring the press-fit load.
Specifically, the press-fitting operation can be terminated when the indentation load of the press-fitting jig 60 reaches a preset load.

  In the present embodiment, the reinforcing rib 46 is provided at a position between the outer peripheral end and the inner peripheral end of the flange portion 42. Therefore, when the straight cylindrical portion 64 of the outer cylindrical member 12 is drawn, the drawing is performed without any trouble. Processing can be performed.

  For example, if the reinforcing rib 46 is provided up to the position where the straight tube portion 64 is provided, it is difficult to draw the straight tube portion 64 at the portion where the reinforcing rib 46 is provided. Thus, the straight cylinder portion 64 can be satisfactorily drawn over the entire length.

  Further, in the present embodiment, the bottom 50 of the reinforcing rib 46 is perpendicular to the axial center, that is, the seating surface seated on the upper end surface of the cylindrical body 36 in FIG. 1 is a horizontal surface in FIG. Therefore, the reinforcing rib 46 can be stably seated over a wide contact area with respect to the upper end surface of the cylindrical body 36, and the press-fitting position by the reinforcing rib 46 can be well defined.

  Furthermore, in this embodiment, since the taper-shaped flange portion 42 is prevented from being deformed during press-fitting, there is an advantage that the pump action by the rubber elastic body 16A is not impaired by the deformation of the flange portion 42. Have.

  In addition, in this embodiment, since the recessed portion 49 inside the reinforcing rib 46 is filled with the rubber elastic body 16B, unlike the case where the recessed portion 49 is not filled with the rubber elastic body, the elastic portion When the outer cylinder fitting 12 and the inner cylinder fitting 14 are set in the mold when the vulcanization molding 16 is performed, the position in the rotation direction does not have to be determined, and the manufacture becomes easy.

  In addition, although the reinforcing ribs 46 are provided on the flange portion 42, the reinforcing ribs 46 are arranged in a distributed manner in the circumferential direction, so that the spring characteristics in the direction perpendicular to the axis vary depending on the rotational direction position. Therefore, in assembling the engine mount 10 to the mating bracket 34, there is an advantage that the position in the rotational direction is not particularly required.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be applied to an engine mount or other cylindrical vibration-proof mount that does not have a liquid chamber as described above. The present invention can be configured in various forms without departing from the spirit of the invention.

It is sectional drawing which shows the engine mount of one Embodiment of this invention with a part of other party bracket. It is a perspective view of the engine mount of the embodiment. It is a bottom view of the engine mount of the embodiment. It is a disassembled perspective view of the engine mount of the embodiment. It is a disassembled sectional view of the engine mount of the embodiment. It is sectional drawing which shows the conventional cylindrical vibration proof mount with the other party bracket.

Explanation of symbols

10 Engine mount (Tubular anti-vibration mount)
12 outer cylinder member 14 inner cylinder member 16 elastic portion 16A, 16B rubber elastic body 18 first liquid chamber 20 second liquid chamber 34 mating bracket 36 cylinder 42 flange portion 44 outermost peripheral end portion 46 reinforcing rib 52 restraint plate 58 straight portion

Claims (5)

A rigid outer cylinder member and an inner cylinder member, and an elastic portion made of a rubber elastic body connecting the outer cylinder member and the inner cylinder member, and the outer cylinder member has one end in the axial direction and the other A cylindrical flange portion is provided that has a tapered flange portion that expands in diameter in the axial direction from the end portion of the outer cylindrical member, and is pressed into the cylindrical body of the mating bracket in the outer cylindrical member and held in a fitted state. In the vibration mount,
A part of the flange portion is protruded in the axial direction toward the cylinder side of the mating bracket, and a reinforcing rib that is seated on the axial end surface of the cylinder body during press-fitting and defines the press-fitting position of the outer cylinder member in the circumferential direction A plurality of anti-vibration mounts provided at predetermined intervals along the axis.   2. The reinforcing rib according to claim 1, wherein the reinforcing rib is provided between an inner portion and an inner peripheral end of the tapered flange portion that are drawn in an axial direction from an outer peripheral end of the tapered flange portion. A cylindrical anti-vibration mount that is continuous in an annular shape without any step.   The cylindrical vibration-proof mount according to any one of claims 1 and 2, wherein an end surface of the reinforcing rib on the cylindrical body side is a surface substantially perpendicular to the axis of the outer cylindrical member.   4. A rigid restraint plate extending radially outward is provided at a shaft end of the inner cylinder member on the flange portion side, and the restraint plate and the tapered flange. A rubber elastic body forming a part of the elastic portion, which is pushed and deformed in the direction along with the relative displacement in the axial direction toward the flange portion of the restraint plate, is disposed between the portion and the portion, A cylindrical vibration-proof mount characterized in that a liquid chamber filled with liquid is formed in the axially inner part of the elastic body.   5. The rubber elastic body positioned between the flange portion and the restraint plate according to claim 4, wherein the outer surface on the restraint plate side forms a substantially tapered surface opposite to the tapered flange portion. And a cylindrical portion characterized in that a straight portion having a gradually decreasing axial width toward the axial center side is formed annularly between the outer peripheral portion and the outer peripheral portion of the restraining plate in the circumferential direction. Shaking mount.

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