JP2009270586A - Vibration control device and its assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device capable of being firmly fixed into a shell cylinder. <P>SOLUTION: An outer cylinder 11 has a recessed portion 15 formed on the whole periphery. In the state of cancelling the constraint of an one-end-side portion 11a of the outer cylinder 11 at its radial outside, when an other-end-side portion 11b of the outer cylinder 11 is deformed to be diameter-shrunk, the one-end-side portion 11a is rolled around the recessed portion 15 back to the radial outside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration isolator and a vibration isolator assembly used in, for example, automobiles and industrial machines.

As this type of vibration isolator, for example, as shown in Patent Document 1 below, an outer cylinder that is press-fitted into an outer cylinder, an inner cylinder that is disposed inside the outer cylinder, and these outer cylinder and inner cylinder And a cylindrical elastic body that is disposed between and elastically connects the two. The vibration isolator is used by being press-fitted into an outer cylinder provided in a suspension arm or the like, for example. At the time of the press-fitting, an elastic repulsion force directed outward in the radial direction of the outer cylinder is applied to the inner peripheral surface of the outer cylinder, so that a frictional force is generated between the outer peripheral surface of the outer cylinder and the inner peripheral surface of the outer cylinder. .
JP 2000-227139 A

  However, since the conventional vibration isolator is fixed in the outer cylinder only by the frictional force, there is a possibility that the conventional anti-vibration apparatus may wobble with respect to the outer cylinder, and there is a problem that applicable devices are easily limited.

  The present invention has been made in consideration of such circumstances, and an object thereof is to provide a vibration isolator and a vibration isolator assembly that can be firmly fixed in the outer cylinder.

In order to solve the above problems and achieve such an object, the vibration isolator of the present invention includes an outer cylinder that is press-fitted into an outer cylinder, an inner cylinder that is disposed inside the outer cylinder, and these And a cylindrical elastic body that is disposed between the outer cylinder and the inner cylinder and elastically connects the two, and the axial end of the outer cylinder extends over the entire circumference thereof. A recess is formed, and in this outer cylinder, in a state where the restraint from the radially outer side with respect to the one end side portion positioned on one end side in the axial direction from the recess is released, the other is positioned on the other end side in the axial direction from the recess. When the end side portion is deformed in a reduced diameter, the one end side portion is configured to warp radially outward around the recess.
Moreover, the vibration isolator assembly of the present invention is a vibration isolator assembly including the vibration isolator of the present invention and an outer cylinder into which the outer cylinder is press-fitted inside, and is one end side of the outer cylinder. The portion protrudes outward in the axial direction from the press-fitting surface into which the other end side portion of the outer cylinder is press-fitted on the inner surface of the outer cylinder, and the outer diameter is larger than the inner diameter of the press-fitting surface. To do.
In the present invention, in the outer cylinder, the other end side portion located on the other end side in the axial direction than the recess is released in a state where the restraint from the radially outer side to the one end side portion located on the one end side in the axial direction from the recess is released. When the diameter-reducing deformation is performed, the one end side portion is warped toward the radially outer side around the recess, so that the outer cylinder is deformed and reduced in diameter from the one axial end side to the press-fitting surface of the outer cylinder. When the one end side portion of the outer cylinder protrudes axially outward from the press-fitting surface, the one end side portion warps and deforms to expand in diameter as described above, so that the outer diameter is larger than the inner diameter of the press-fitting surface. Can also be increased.
Thereby, not only the friction force is generated between the other end side portion of the outer cylinder and the press-fitting surface of the outer cylinder, but also the one end side portion of the outer cylinder is connected to the press-fitting surface in the outer cylinder from the one end side in the axial direction. The vibration isolator can be firmly fixed in the outer cylinder.
In addition, since the concave portion is formed only at one end portion in the axial direction of the outer cylinder, and the entire one of the one end side portion and the other end side portion of the outer cylinder is not thinned, the above-described operational effects On the other hand, the strength of the outer cylinder can be prevented from greatly decreasing.

Here, the said recessed part may be continuously extended over the perimeter to the axial direction one end part of an outer cylinder.
In this case, since the recess extends continuously over the entire circumference of the one end portion in the axial direction of the outer cylinder, when the one end side portion of the outer cylinder is protruded axially outward from the press-fit surface as described above. The one end side portion can be uniformly enlarged and deformed over the entire circumference, and the engagement force between the one end side portion of the outer cylinder and the portion continuous from the one end side in the axial direction to the press-fitting surface in the outer cylinder is circumferential. It can prevent variation.

Moreover, the said recessed part may be formed in the outer peripheral surface of an outer cylinder.
In this case, the recess can be easily formed.

Further, one end portion in the axial direction of the elastic body may be located in an axial direction portion where the concave portion is located in the outer cylinder.
In this case, since the one end portion in the axial direction of the elastic body is located in the axial portion where the recess is located in the outer cylinder, not only the elastic restoring force of the outer cylinder itself but also the elastic body The one end side portion can be expanded and deformed as described above by applying the elastic restoring force of the same, and the amount of the expanded diameter deformation can be increased.
In addition, since one axial end portion of the elastic body is positioned in the axial portion where the concave portion is located in the outer cylinder in this way, the axial portion where the concave portion is formed in the outer cylinder and the strength is reduced is used as the elastic body. It is also possible to reinforce.

Here, in the vibration isolator assembly, the one end side portion of the outer cylinder may be positioned on the inner side in the axial direction than the one end edge in the axial direction on the outer peripheral surface of the outer cylinder.
In this case, since the one end side portion of the outer cylinder is located on the inner side in the axial direction from the one axial end edge of the outer peripheral surface of the outer cylinder, the one end side portion can be located on the inner side in the axial direction of the outer cylinder. Thus, for example, it is possible to prevent the one end side portion of the outer cylinder from being easily deteriorated by being exposed to the outside air, or from being easily broken by a stepping stone or the like.

Further, a flange portion may protrude from the other axial end edge of the outer cylinder, and the outer cylinder may be sandwiched between the flange portion and one end side portion of the outer cylinder in the axial direction.
In this case, since the outer cylinder is sandwiched in the axial direction by the flange portion and one end side portion in the outer cylinder, it becomes possible to suppress relative displacement along the axial direction of the vibration isolator and the outer cylinder, The vibration isolator can be more firmly fixed in the outer cylinder, and this fixed state can be maintained for a long time.

  According to this invention, the vibration isolator can be firmly fixed in the outer cylinder.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 to 3.
The vibration isolator 10 is disposed between the outer cylinder 11, the inner cylinder 12 disposed inside the outer cylinder 11, and the outer cylinder 11 and the inner cylinder 12, and elastically connects the two. The outer cylinder 11 is press-fitted inside the outer cylinder 21 and used, for example, at the connecting portion between the trailing arm of the torsion beam type rear suspension and the vehicle body.
In the illustrated example, the outer cylinder 21, the outer cylinder 11, the inner cylinder 12, and the elastic body 13 are arranged coaxially with the common shaft. Hereinafter, this common axis is referred to as a central axis O.

The outer cylinder 21 is formed of a metal material in a cylindrical shape. Further, of the inner surface of the outer cylinder 21, one end surface 21b connected to the press-fitting surface 21a into which the outer cylinder 11 is press-fitted from one end side in the central axis O direction gradually expands from the inner side to the outer side in the central axis O direction. It is a diameter inclined surface. Furthermore, the other end edge 21c in the direction of the central axis O of the outer cylinder 21 is a flat surface extending along the radial direction.
In the example shown in the figure, the connecting portion between the press-fit surface 21a and the one end surface 21b on the inner surface of the outer cylinder 21 is a corner pointed radially inward. Further, the one end surface 21b extends linearly toward the outer side in the radial direction gradually from the inner side to the outer side in the central axis O direction. Further, the press-fit surface 21a extends in parallel along the direction of the central axis O.

  The outer cylinder 11 is formed of a resin material in a cylindrical shape, and the thickness thereof is the same throughout the entire area and is thinner than the outer cylinder 21 and the inner cylinder 12. Examples of the resin material include thermoplastic resins such as polyamide resin, ABS, polyacetal, polycarbonate and polyimide, thermosetting resins such as epoxy resin and phenol resin, and elastomers.

  In the present embodiment, a flange portion 14 projects from the other end edge of the outer cylinder 11 in the direction of the central axis O. The flange portion 14 extends continuously over the entire circumference of the outer cylinder 11. The outer diameter of the flange portion 14 is equal to the outer diameter of the outer cylinder 21. Further, the surface of the flange portion 14 facing the inside in the direction of the central axis O is in contact with the other end edge 21 c of the outer cylinder 21.

  The inner cylinder 12 is formed in a cylindrical shape with a metal material or a resin material having higher rigidity than the resin material forming the outer cylinder 11, and the thickness thereof is thinner than the outer cylinder 21 and thicker than the outer cylinder 11. The wall thickness of the inner cylinder 12 is the same throughout the entire area. Further, both end portions of the inner cylinder 12 in the direction of the central axis O protrude from the outer cylinder 21 to the outside in the direction of the central axis O.

  The elastic body 13 is formed of a rubber material, and is vulcanized and bonded to the inner peripheral surface of the outer cylinder 11 and the outer peripheral surface of the inner cylinder 12. The elastic body 13 is bonded over almost the entire area of the inner peripheral surface of the outer cylinder 11 and the outer peripheral surface of the inner cylinder 12. Note that both end surfaces of the elastic body 13 facing the outside in the direction of the central axis O are gradually directed toward the inside in the direction of the central axis O from the outer peripheral surface side of the inner cylinder 12 toward the inner peripheral surface side of the outer cylinder 11. Inclined. Further, the elastic body 13 covers the surface of the flange portion 14 of the outer cylinder 11 that faces the outside in the direction of the central axis O. Further, as shown in FIG. 2, the elastic body 13 extends along the central axis O direction at positions opposite to each other across the axis O in the radial direction in a plan view viewed from the central axis O direction. A cavity 13a extending in the direction is formed.

  In the above configuration, the vibration isolator 10 is used by being fixed in the outer cylinder 21 with one end portion in the direction of the central axis O positioned on the vehicle inner side and the other end portion positioned on the vehicle outer side. .

  And in this embodiment, the recessed part 15 is formed in the one end part in the said central axis O direction of the outer cylinder 11 over the perimeter. The recess 15 extends continuously at one end in the direction of the central axis O of the outer cylinder 11 over the entire circumference. In the illustrated example, the recess 15 is formed on the outer peripheral surface of the outer cylinder 11. The depth of the recess 15 is, for example, about 10% to 80% of the thickness of the outer cylinder 11. Specifically, the depth of the recess 15 is, for example, 0.2 mm to 3.2 mm, and the thickness of the outer cylinder 11 is, for example, 2 mm to 4 mm. Further, the recess 15 may be formed by molding in the mold at the same time when the outer cylinder 11 is formed, or may be formed by cutting. The concave portion 15 includes a bottom surface and a pair of rising surfaces rising from both ends of the bottom surface of the outer cylinder 11 in the central axis O direction toward the radially outer side. , Is defined by.

  Here, one end of the elastic body 13 in the direction of the central axis O is located at a portion corresponding to the recess 15 on the inner peripheral surface of the outer cylinder 11. Further, the one end of the elastic body 13 is continuous over the entire circumference of the portion corresponding to the recess 15 on the inner peripheral surface of the outer cylinder 11.

Further, one end portion 11 a located on one end side in the central axis O direction with respect to the recess 15 in the outer cylinder 11 protrudes from the press-fit surface 21 a of the outer cylinder 21 to the outside in the central axis O direction. Further, the outer diameter of the one end portion 11 a of the outer cylinder 11 is larger than the inner diameter of the press-fitting surface 21 a of the outer cylinder 21.
Of the pair of rising surfaces defining the recess 15, the rising surface located on one end side in the direction of the central axis O, or a connecting portion between the rising surface and the outer peripheral surface of the one end side portion 11 a of the outer cylinder 11. Is in pressure contact with the one end surface 21 b of the outer cylinder 21. Further, as described above, the outer surface of the flange portion 14 facing the inner side in the direction of the central axis O is in contact with the other end edge 21c of the outer tube 21, so that the outer tube 21 is a flange of the outer tube 11. It is sandwiched in the direction of the central axis O by the portion 14 and the one end side portion 11a.
Further, the outer peripheral surface of the one end side portion 11 a of the outer cylinder 11 is located on the inner side in the central axis O direction with respect to the one end edge 21 d in the central axis O direction on the outer peripheral surface of the outer cylinder 21.

  Here, in the vibration isolator 10 before being press-fitted into the outer cylinder 21, as shown in FIG. 3, the outer diameter of the one end side portion 11a of the outer cylinder 11 is larger than the recess 15 in the central axis. It is located on the other end side in the O direction and is equal to or larger than the outer diameter of the other end side portion 11b press-fitted into the press-fitting surface 21a of the outer cylinder 21. In the illustrated example, the outer diameter of the one end side portion 11a of the outer cylinder 11 is equal to the outer diameter of the other end side portion 11b.

Then, the outer cylinder 11 is deformed in a reduced diameter, and is pushed into the press-fitting surface 21a of the outer cylinder 21 from one end side in the central axis O direction, and the surface of the flange portion 14 facing the inner side in the central axis O direction is the outer cylinder. The one end side portion 11a of the outer cylinder 11 is protruded to the outside in the direction of the central axis O from the press-fitting surface 21a. At this time, the elastic restoring force and the elastic restoring force of the one end of the elastic body 13 act on the one end portion 11 a of the outer cylinder 11, so that the one end portion 11 a is directed radially outward around the recess 15. Can be warped and deformed. Thereby, in the outer cylinder 11, of the pair of rising surfaces defining the recess 15, the rising surface located on one end side in the direction of the central axis O, or the rising surface and the outer peripheral surface of the one end side portion 11a. Is connected to the one end surface 21 b of the outer cylinder 21.
That is, when the outer cylinder 11 is deformed by reducing the diameter of the other end portion 11b in a state where the restriction from the radially outer side with respect to the one end portion 11a is released, the one end portion 11a is formed around the recess 15. In this way, it can be expanded and deformed by warping outward in the radial direction.

As described above, according to the vibration isolator assembly according to the present embodiment, not only the frictional force is generated between the other end portion 11b of the outer cylinder 11 and the press-fitting surface 21a of the outer cylinder 21, It is also possible to engage the one end portion 11 a of the outer cylinder 11 with the one end surface 21 b of the outer cylinder 21, and the vibration isolator 10 can be firmly fixed in the outer cylinder 21.
Further, the recess 15 is formed only at one end portion in the direction of the central axis O of the outer cylinder 11, and either the one end side portion 11 a or the other end side portion 11 b of the outer cylinder 11 is thinned. Therefore, the strength of the outer cylinder 11 can be prevented from greatly decreasing.

Furthermore, in this embodiment, since the recessed part 15 is continuously extended over the perimeter to the one end part in the said central axis O direction of the outer cylinder 11, the one end side part 11a of the outer cylinder 11 is press-fit as mentioned above. When projecting outward from the surface 21a in the direction of the central axis O, the one end portion 11a can be uniformly enlarged and deformed over its entire circumference, and the one end portion 11a of the outer tube 11 and the outer tube It is possible to prevent the engaging force with the one end surface 21b of the 21 from varying in the circumferential direction.
Moreover, since the recessed part 15 is formed in the outer peripheral surface of the outer cylinder 11, this recessed part 15 can be formed in the outer cylinder 11 easily.

Further, since the one end portion of the elastic body 13 is located at a portion corresponding to the recess 15 on the inner peripheral surface of the outer cylinder 11, the elastic restoring force of the outer cylinder 11 itself is applied to the one end side portion 11 a of the outer cylinder 11. Not only that, but also the elastic restoring force of the elastic body 13 can be applied to the one end side portion 11a to expand and deform as described above, and the amount of expansion of the diameter can be increased.
In addition, since the one end portion of the elastic body 13 is located at a portion corresponding to the concave portion 15 on the inner peripheral surface of the outer cylinder 11 as described above, the concave portion 15 is formed in the outer cylinder 11 and the strength is reduced. The portion can be reinforced by the elastic body 13.

  Furthermore, since the one end side portion 11 a of the outer cylinder 11 is located on the inner side in the direction of the central axis O than the one end edge 21 d on the outer peripheral surface of the outer cylinder 21, the one end side portion 11 a is disposed on the outer cylinder 21. It is possible to locate the inner side in the direction of the central axis O. For example, the one end side portion 11a of the outer cylinder 11 is easily deteriorated by being exposed to the outside air, or a stepping stone or the like collides and becomes easily broken. Can be prevented.

  Further, since the outer cylinder 21 is sandwiched between the flange portion 14 and the one end side portion 11a of the outer cylinder 11 in the central axis O direction, the vibration isolator 10 and the outer cylinder 21 are relatively aligned along the central axis O direction. Therefore, the vibration isolator 10 can be more firmly fixed in the outer cylinder 21 and this fixed state can be maintained for a long time.

  Further, in the present embodiment, in the outer cylinder 11, of the pair of rising surfaces defining the recess 15, the rising surface located on one end side in the direction of the central axis O, or the rising surface and the one end side portion 11a. Since the connecting portion with the outer peripheral surface is in pressure contact with the one end surface 21b of the outer cylinder 21 by the elastic restoring force, the other end portion 11b of the outer cylinder 11 and the press-fit surface 21a of the outer cylinder 21 as described above. And the engagement between the one end surface 21b of the outer cylinder 21 and the one end portion 11a of the outer cylinder 11, as well as the rising surface or the connecting portion and the one end surface 21b of the outer cylinder 21. It is possible to generate a frictional force therebetween, and the vibration isolator 10 can be more firmly fixed in the outer cylinder 21.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the vibration isolator 10 and the vibration isolator assembly are configured to be used by being arranged at the connecting portion between the trailing arm of the torsion beam type rear suspension and the vehicle body. However, the present invention is not limited thereto. It is not a thing.

Moreover, although the recessed part 15 showed the structure extended continuously to the one end part in the said central axis O direction of the outer cylinder 11 over the perimeter in the said embodiment, it is not restricted to this, For example, it extends intermittently. Alternatively, it may be scattered.
Furthermore, in the said embodiment, although the recessed part 15 was formed in the outer peripheral surface of the outer cylinder 11, you may form in an inner surface. When the concave portion is formed on the inner surface of the outer cylinder 11 as described above, the concave portion may be filled with the one end portion of the elastic body 13.

Further, the shape of the recess 15 is not limited to the illustrated form, and may be changed as appropriate. For example, the anti-vibration device 10 may be formed in a rectangular shape, a curved surface shape, a trapezoidal shape, or the like in a longitudinal sectional view.
Furthermore, the shape of the connecting portion between the press-fitting surface 21a and the one end surface 21b on the inner surface of the outer cylinder 21 is not limited to the illustrated form, and may be appropriately changed. For example, the anti-vibration device 10 may have a curved surface or the like in a longitudinal sectional view.

Moreover, in the said embodiment, although the said one end surface 21b was formed in the inner surface of the outer cylinder 21, you may not have this one end surface 21b, but you may make the whole inner surface of the outer cylinder 21 into the press-fit surface 21a. Furthermore, the one end face 21b may be appropriately changed, for example, formed in a convex curved shape toward the inside in the radial direction.
Furthermore, in the said embodiment, although the said other end edge 21c of the outer cylinder 21 was made into the flat surface extended along radial direction, you may change suitably, for example not only to this but to a chamfered shape or a curved surface shape.
Moreover, in the said embodiment, although the outer diameter of the flange part 14 was made equivalent to the outer diameter of the outer cylinder 21, you may make it mutually differ.
Furthermore, the inner cylinder 12 is not limited to the form shown in the embodiment, and may be changed as appropriate.
Moreover, you may employ | adopt the structure which does not have the space 13a as the elastic body 13. FIG.

Furthermore, in the said embodiment, although the flange part 14 was provided in the outer cylinder 11, you may employ | adopt the outer cylinder which does not have this flange part 14. FIG.
Furthermore, the recess 15 may be formed not only at one end in the central axis O direction of the outer cylinder 11 but also at the other end. A portion of the outer cylinder 11 that is located on the other end side in the central axis O direction from the recess 15 formed in the other end protrudes outward from the press-fit surface 21a of the outer cylinder 21 in the central axis O direction. You may make it make it.
Moreover, in the said embodiment, although the said one end part of the elastic body 13 showed the structure located in the part corresponding to the recessed part 15 in the internal peripheral surface of the outer cylinder 11, the said one end part of the elastic body 13 was shown as an outer cylinder. 11 may be positioned closer to the other end side (inner side) in the direction of the central axis O than the portion corresponding to the recess 15 on the inner peripheral surface.

  Moreover, in the said embodiment, although the one end side part 11a of the outer cylinder 11 was located inside this axial O direction rather than the one end edge 21d of the said center axis O direction in the outer peripheral surface of the outer cylinder 21, it is not restricted to this. Instead, the one end side portion 11 a of the outer cylinder 11 may be protruded outward from the outer cylinder 21 in the direction of the central axis O.

Furthermore, the one end side portion 11a of the outer cylinder 11 is not limited to the above embodiment, and may be appropriately changed. For example, as shown in FIG. 4, the other end portion in the direction of the central axis O connected to the recess 15 in the one end side portion 11 a of the outer cylinder 11 is made larger than the outer diameter of the other end side portion 11 b of the outer cylinder 11. Also good. 4 is gradually reduced in diameter from the other end side toward the one end side along the central axis O direction, and the one end side portion 11a in the central axis O direction is gradually reduced. The other end edge is a corner pointed outward in the radial direction.
Further, instead of the configuration shown in FIG. 4, for example, the other end portion in the central axis O direction connected to the recess 15 in the one end side portion 11 a of the outer cylinder 11 extends in parallel along the axis O direction. In addition, the outer diameter may be larger than the outer diameter of the other end portion 11b.

  The vibration isolator can be firmly fixed in the outer cylinder.

It is a longitudinal cross-sectional view of the vibration isolator assembly shown as one Embodiment concerning this invention. It is a top view of the vibration isolator assembly shown in FIG. FIG. 2 is a longitudinal sectional view showing the state of the vibration isolator shown in FIG. 1 before being press-fitted into the outer cylinder. It is a principal part expanded longitudinal cross-sectional view of the outer cylinder of the vibration isolator shown as other embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 Outer cylinder 11a One end side part 11b Other end side part 12 Inner cylinder 13 Elastic body 14 Flange part 15 Recessed part 21 Outer cylinder 21a Press-fit surface 21d One end edge O Center axis (axis)

Claims (7)

An outer cylinder that is press-fitted into the outer cylinder, an inner cylinder that is disposed inside the outer cylinder, and a cylindrical elastic body that is disposed between the outer cylinder and the inner cylinder and elastically connects the two. An anti-vibration device comprising:
A concave portion is formed over the entire circumference of one end of the outer cylinder in the axial direction,
In this outer cylinder, the other end side portion positioned on the other end side in the axial direction from the concave portion is contracted in a state where the restraint from the radially outer side to the one end side portion positioned on the one end side in the axial direction from the concave portion is released. An anti-vibration device according to claim 1, wherein the one end side portion is warped around the concave portion toward the radially outer side when radially deformed. The vibration isolator according to claim 1,
The said recessed part is continuously extended over the perimeter to the axial direction one end part of an outer cylinder, The vibration isolator characterized by the above-mentioned. The vibration isolator according to claim 1 or 2,
The vibration isolator is characterized in that the recess is formed on the outer peripheral surface of the outer cylinder. The vibration isolator according to any one of claims 1 to 3,
One end portion in the axial direction of the elastic body is located in an axial portion where the concave portion is located in the outer cylinder. An anti-vibration device assembly comprising the anti-vibration device according to any one of claims 1 to 4, and an outer cylinder in which the outer cylinder is press-fitted inside,
One end portion of the outer cylinder protrudes outward in the axial direction from the press-fit surface into which the other end side portion of the outer cylinder is press-fitted on the inner surface of the outer cylinder, and the outer diameter thereof is larger than the inner diameter of the press-fit surface. A vibration isolator assembly characterized by comprising: The vibration isolator assembly according to claim 5,
One end side portion of the outer cylinder is located on the inner side in the axial direction from one axial end edge of the outer peripheral surface of the outer cylinder. The vibration isolator assembly according to claim 5 or 6,
A vibration isolator assembly characterized in that a flange portion projects from the other axial end edge of the outer tube, and the outer tube is sandwiched in the axial direction by the flange portion and one end side portion of the outer tube. body.

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