Vibration control device, vibration control unit, and vibration control structure

Abstract

To provide a vibration control device which makes vibration of a heat insulator less likely to be transmitted to a counterpart member, and to provide a vibration control unit and a vibration control structure.SOLUTION: A vibration control device 100a includes: a cylindrical member 110 which extends from one side to the other side in an axial direction and is fixed to a counterpart member A with the other side facing the counterpart member A; a cylindrical mass body 120 which is disposed with its inner peripheral surface 121 spaced a predetermined distance apart from an outer peripheral surface 114 of the cylindrical member 110; an elastic connection part 130 connecting the inner peripheral surface 121 of the mass body 120 with the outer peripheral surface 114 of the cylindrical member 110 and formed of an elastic body; and a heat insulator 140 which covers at least a part of one side of the elastic connection part 130 when viewed in the axial direction from the one side to the other side. The heat insulator 140 is attached to the mass body 120. Thus, the structure makes vibration of the heat insulator 140 less likely to be transmitted to the counterpart member A.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vibration isolation device, a vibration isolation unit, and a vibration isolation structure, and particularly to a vibration isolation device, a vibration isolation unit, and a vibration isolation structure that can make it difficult to transmit the vibration of a heat insulator to an opposing member.

Background Art

[0002] There is known a vibration isolation device including a cylindrical member that extends from one axial direction to the other and is fixed to an opposing member with the other side facing the opposing member, a cylindrical mass body whose inner peripheral surface is disposed at a predetermined interval from the outer peripheral surface of the cylindrical member, and an elastic coupling portion composed of an elastic body that connects the inner peripheral surface of the mass body and the outer peripheral surface of the cylindrical member (Patent Document 1).

[0003] Further, among such vibration isolation devices, there is known a vibration isolation device 1a in which an exhaust pipe that radiates heat is disposed on one side of a cylindrical member 10, and a heat insulator 40 for shielding heat radiated from the exhaust pipe or the like to an elastic coupling portion 30 is attached to one end surface 11 of the cylindrical member 10 (see FIG. 5). Note that FIG. 5 is a longitudinal sectional view of a conventional vibration isolation device 1a. The cylindrical member, the mass body, and the elastic coupling portion of the vibration isolation device of Patent Document 1 respectively correspond to the cylindrical member 10, the mass body 20, and the elastic coupling portion 30 of the vibration isolation device 1a. The vibration isolation device 1a is attached to an opposing member A by a fastening member 50.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above-described conventional technology, since the heat insulator is attached to the cylindrical member, there is a problem that the vibration of the heat insulator is easily transmitted to the opposing member.

[0006] The present invention has been made to solve the above-described problems, and an object thereof is to provide a vibration isolation device, a vibration isolation unit, and a vibration isolation structure that can make it difficult to transmit the vibration of a heat insulator to an opposing member.

Means for Solving the Problems

[0007] In order to achieve this object, the vibration isolation device of the present invention includes a cylindrical tubular member that extends from one axial direction to the other and is fixed to the opposing member with the other side facing the opposing member, a cylindrical mass body whose inner peripheral surface is arranged at a predetermined interval from the outer peripheral surface of the tubular member, an elastic connection portion composed of an elastic body that connects the inner peripheral surface of the mass body and the outer peripheral surface of the tubular member, and a heat insulator that covers at least a part of the one side of the elastic connection portion in an axial view seen from the one side toward the other side, and the heat insulator is attached to the mass body.

[0008] The vibration isolation structure of the present invention uses a vibration isolation device and includes a fastening member that is inserted from the one side to the other side of the tubular member and fixes the tubular member to the opposing member. The fastening member includes a columnar shaft portion that is inserted into the tubular member, a head portion that projects radially outward from an end portion of the one side of the shaft portion, and an overhanging portion that projects radially outward from the outer surface of the head portion more than the outer peripheral surface.

[0009] The vibration isolation unit of the present invention includes a vibration isolation device and a fastening member that is inserted from one side to the other side of the cylindrical member and fixes the cylindrical member to the mating member. The fastening member includes a columnar shaft portion inserted into the cylindrical member and a head portion that projects radially outward from one end of the shaft portion. The heat insulator includes a first portion that extends to one side of the portion where the radial distance of the head portion is the largest, and a second portion that projects radially inward from one end of the first portion and has an opening formed at the center. In the axial view, the second portion, or the second portion and the fastening member cover all of the one side of the elastic coupling portion.

Effect of the Invention

[0010] According to the vibration isolation device described in claim 1, since the heat insulator is attached to the mass body, the vibration of the heat insulator can be absorbed by the elastic coupling portion. Therefore, it is difficult to transmit the vibration of the heat insulator to the mating member.

[0011] According to the vibration isolation device described in claim 2, in addition to the effect of the vibration isolation device described in claim 1, since the heat insulator is attached to one end face of the mass body, for example, compared with the case of press-fitting the mass body inside the heat insulator, the heat insulator can be attached to the mass body regardless of the dimensional accuracy of each member in the radial direction orthogonal to the axial direction. Therefore, the attachment of the heat insulator to the mass body can be facilitated.

[0012] According to the vibration isolation structure described in claim 3, since the heat insulator is attached to the mass body, the vibration of the heat insulator can be absorbed by the elastic coupling portion. Therefore, it is difficult to transmit the vibration of the heat insulator to the mating member.

[0013] Further, it includes a fastening member that is inserted from one side of the cylindrical member toward the other side and fixes the cylindrical member to the mating member. The fastening member includes a columnar shaft portion inserted into the cylindrical member, a head portion that projects radially outward from one end of the shaft portion, and an overhanging portion that projects radially outward from the outer surface of the head portion more than the outer peripheral surface. Therefore, it is easy to shield the heat radiated from the opposite side of the mating member toward the mating member with the overhanging portion. Thus, the heat insulation effect can be improved.

[0014] According to the vibration isolation structure described in claim 4, in addition to the effect of the vibration isolation structure described in claim 3, the heat insulator is located on the other side of the overhanging portion, and the overhanging portion and the heat insulator overlap each other at least in part in the circumferential direction when viewed in the axial direction. Therefore, even when the mass body tends to come out to one side in the axial direction, it is easy to bring the overlapping portions of the overhanging portion and the heat insulator into contact with each other when viewed in the axial direction. Thus, even when the elastic connecting portion is broken and the mass body tends to fall off from the mating member to the opposite side, the falling off of the mass body can be suppressed.

[0015] According to the vibration isolation structure described in claim 5, in addition to the effect of the vibration isolation structure described in claim 4, the overhanging portion and the heat insulator overlap each other over the entire circumference when viewed in the axial direction. Therefore, it is easy to shield the heat radiated from the opposite side of the mating member toward the mating member over the entire circumference. Thus, the heat insulation effect can be improved.

[0016] According to the vibration isolation unit described in claim 6, the fastening member includes a columnar shaft portion inserted into the cylindrical member and a head portion that projects radially outward from one end of the shaft portion. The heat insulator includes a first portion that extends to one side of the portion where the radial distance of the head portion is the maximum, and a second portion that projects radially inward from one end of the first portion and has an opening formed at the center. When viewed in the axial direction, the second portion, or the second portion and the fastening member cover all of one side of the elastic connecting portion. Therefore, it is easy to shield the heat radiated from the opposite side of the mating member toward the mating member with the heat insulator. Thus, the heat insulation effect can be improved.

[0017] According to the vibration isolation unit described in claim 7, in addition to the effects achieved by the vibration isolation unit described in claim 6, the fastening member includes an overhanging portion that projects radially outward from the outer surface of the head more than the outer peripheral surface, the first portion is located on the other side of the overhanging portion and includes a protruding portion that projects radially inward, and the overhanging portion and the protruding portion overlap each other at least partially in the circumferential direction in an axial view. Therefore, even when the mass body tries to come out to one side in the axial direction, the overlapping portions of the overhanging portion and the protruding portion in the axial view can be easily brought into contact with each other. Thus, even when the elastic connecting portion is broken and the mass body tries to drop off from the mating member to the opposite side, the dropping off of the mass body can be suppressed.

[0018] According to the vibration isolation unit described in claim 8, in addition to the effects achieved by the vibration isolation unit described in claim 7, the overhanging portion and the second portion overlap each other entirely in the axial view, and the second portion and the head have a gap between the inner peripheral surface of the opening of the second portion and the outer surface of the head in the axial view. Therefore, while it is easy to shield the radiation of heat from the axial direction and the direction intersecting the axial direction with a heat insulator, it is also easy to insert a tool for tightening the fastening member through the opening. Thus, both the heat insulation effect of the heat insulator and the ease of attaching the vibration isolation device to the mating member can be achieved.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0020] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of a vibration isolator 100a according to a first embodiment of the present invention. In FIG. 1, the arrow F-B in the figure indicates the front-rear direction of the vibration isolator 100a (the same applies to the vibration isolator 200a in the second embodiment and the vibration isolator 300a (vibration isolation unit 300) in the third embodiment).

[0021] As shown in FIG. 1, the vibration isolator 100a is a device for suppressing harmful vibrations such as vibrations of an engine or the like in a vehicle such as an automobile or an industrial machine, and resonance generated during running (operation). The vibration isolator 100a is attached to the vibrating mating member A by a fastening member 150. On the opposite side (one side) of the mating member A with the vibration isolator 100a interposed therebetween, a member such as an exhaust pipe that radiates heat (not shown) is disposed.

[0022] The vibration isolator 100a includes a cylindrical tubular member 110, a cylindrical mass body 120 disposed at a predetermined interval radially outside the tubular member 110, an elastic connection portion 130 composed of an elastic body connecting the tubular member 110 and the mass body 120, and a heat insulator 140 attached to the mass body 120.

[0023] In the vibration isolator 100a according to the first embodiment, since the heat insulator 140 is attached to the mass body 120, the vibration of the heat insulator 140 can be absorbed by the elastic connection portion 130. Therefore, compared with the conventional vibration isolator 1a, it is possible to make it difficult to transmit the vibration of the heat insulator 140 to the mating member A.

[0024] The tubular member 110 has a through hole 113 and is a cylindrical metal member centered on the axis O. The tubular member 110 includes one end face 111 that is an end face on one side (front (arrow F direction) side) in the axial direction and the other end face 112 that is an end face on the other side (rear (arrow B direction) side) in the axial direction. The fastening member 150 is inserted into the through hole 113 of the tubular member 110, and the tubular member 110 is screwed (fixed) to the mating member A with the other end face 112 facing the mating member A. The elastic connection portion 130 is connected to the outer peripheral surface 114 of the tubular member 110.

[0025] The fastening member 150 is a metal member for fixing the cylindrical member 110 to the mating member A, and includes a cylindrical shaft portion 151 inserted into the through hole 113 of the cylindrical member 110, a head portion 152 located on one axial side of the end face 111 of the cylindrical member 110, and an overhanging portion 153 projecting radially outward from the outer surface of the head portion 152. The head portion 152 projects radially outward from the outer diameter of the shaft portion 151, and a part of the overhanging portion 153 projects radially outward from the outer peripheral surface 114 of the cylindrical member 110.

[0026] The fastening member 150 is configured as a hexagonal bolt in which the outer periphery of the tip side (the other axial side) of the shaft portion 151 has a male thread shape and the outer shape of the head portion 152 has a hexagonal shape. The male thread portion of the shaft portion 151 is screwed with a nut (not shown) disposed on the other side of the mating member A to fix the vibration isolator 100a to the mating member A. Note that the fastening member 150 may be configured as a rivet, or the male thread portion of the shaft portion 151 may be screwed with a female thread portion formed on the mating member A.

[0027] The mass body 120 is a cylindrical metal member having an inner peripheral surface 121 and an outer peripheral surface 122 and coaxially surrounding the cylindrical member 110. The axis of the mass body 120 is the same as the axis O of the cylindrical member 110. An elastic connecting portion 130 is connected to the inner peripheral surface 121 of the mass body 120.

[0028] The mass body 120 includes a first end face 123 that is an end face on one axial side (front side) and a second end face 124 that is an end face on the other axial side (rear side). A heat insulator 140 is screwed to the first end face 123 of the mass body 120.

[0029] The elastic connecting portion 130 is a member made of an elastic body such as rubber or a thermoplastic elastomer. The elastic connecting portion 130 is provided on the entire circumference between the inner peripheral surface 121 of the mass body 120 and the outer peripheral surface 114 of the cylindrical member 110, and is vulcanized and adhered to the inner peripheral surface 121 of the mass body 120 and the outer peripheral surface 114 of the cylindrical member 110. When the elastic connecting portion 130 elastically deforms, the cylindrical member 110 and the mass body 120 can be relatively displaced.

[0030] The heat insulator 140 is disposed between a member (not shown) that radiates heat such as an exhaust pipe and the elastic connecting portion 130, and is for shielding heat radiation from the member to the elastic connecting portion 130. The heat insulator 140 is a stepped cylindrical metal member that is screwed to the first end surface 123 of the mass body 120.

[0031] The heat insulator 140 includes a mounted portion 141 that is screwed to the first end surface 123 by a screw 160, a standing portion 142 that stands upright from an end portion on the radially inner side of the mounted portion 141 toward one side in the axial direction, and a parallel portion 143 that projects radially inward perpendicularly from an end portion on one side in the axial direction of the standing portion 142.

[0032] For the heat insulator 140, the screw 160 is inserted through holes at positions 180° apart in the circumferential direction, and the mounted portion 141 is attached to the mass body 120 (see FIG. 2). A part of the parallel portion 143 on the radially inner side covers the elastic connecting portion 130 in the axial direction.

[0033] A circular opening 144 is formed at the center in the radial direction of the parallel portion 143. That is, the heat insulator 140 has a substantially S shape in a cross section cut by a plane including the axis O. The parallel portion 143 is located on the other end surface 112 side (the other side (rear side)) in the axial direction than the overhanging portion 153 of the fastening member 150.

[0034] Referring to FIG. 2, the relationship between the heat insulator 140 and the fastening member 150 will be described. FIG. 2 is a top view of the vibration isolator 100a viewed from the direction of arrow II in FIG. 1. As shown in FIG. 2, a part of the tip side of the parallel portion 143 of the heat insulator 140 and a part of the outer edge side of the overhanging portion 153 of the fastening member 150 overlap each other over the entire circumference in the circumferential direction in the axial view (top view). That is, the inner diameter D1 of the opening 144 is set smaller than the outer diameter D3 of the overhanging portion 153.

[0035] The vibration isolator 100a is manufactured as follows. The cylindrical member 110 and the mass body 120 are vulcanized and adhered by the elastic connecting portion 130, and then the heat insulator 140 is screwed to the first end face 123 of the mass body 120. The other end face 112 of the cylindrical member 110 is arranged facing the mating member A so that the through hole 113 of the cylindrical member 110 corresponds to the connection hole of the mating member A, and the fastening member 150 is inserted through the through hole 113 of the cylindrical member 110. In this state, the head 152 of the fastening member 150 is tightened with a tool such as a socket wrench or a box wrench to attach the vibration isolator 100a to the mating member A.

[0036] According to the vibration isolator 100a of the first embodiment, since the heat insulator 140 is attached to the mass body 120, the mass of the heat insulator 140 can be added to the mass body 120. Therefore, the mass of the heat insulator 140 can contribute to the vibration isolation performance of the vibration isolator 100a. Therefore, the overall mass of the vibration isolator 100a can be made lighter compared to the case where the mass of the mass body 120 itself is increased.

[0037] Further, since the heat insulator 140 is attached to the first end face 123 of the mass body 120, for example, compared with the vibration isolator 200a in the second embodiment which has a structure in which the mass body 120 is press-fitted inside the heat insulator 240 to be described later, the heat insulator 140 can be attached to the mass body 120 regardless of the dimensional accuracy of each member in the radial direction. Therefore, the attachment of the heat insulator 140 to the mass body 120 can be facilitated.

[0038] According to the vibration isolation structure in which the vibration isolation device 100a of the first embodiment is attached to the mating member A, the fastening member 150 includes an overhanging portion 153 that protrudes radially outward from the outer peripheral surface 114 of the cylindrical member 110 on one axial side of the elastic coupling portion 130. Therefore, it is easy to shield the heat radiated from the opposite side of the mating member A toward the mating member A (toward the elastic coupling portion 130) with the overhanging portion 153. Thus, the heat shielding effect can be improved.

[0039] Also, in the axial view, since a part of the overhanging portion 153 of the fastening member 150 overlaps with a part of the parallel portion 143 of the heat insulator 140, when the elastic coupling portion 130 of the vibration isolation device 100a breaks and the mass body 120 tries to come out of the cylindrical member 110, it is easy to bring the parallel portion 143 of the heat insulator 140 into contact with the overhanging portion 153. Thus, it is possible to suppress the mass body 120 from falling off the cylindrical member 110.

[0040] Also, since a part of the overhanging portion 153 of the fastening member 150 and a part of the parallel portion 143 of the heat insulator 140 overlap with each other in the entire circumference in the axial view, the heat radiated from one axial side to the other side can be shielded by the overhanging portion 153 and the heat insulator 140 in the entire circumference. Thus, the heat shielding effect can be improved.

[0041] Next, with reference to FIG. 3, the vibration isolation device 200a and the vibration isolation structure in which the vibration isolation device 200a is attached to the mating member A in the second embodiment will be described. In the first embodiment, the case where the heat insulator 140 is screwed to the mass body 120 has been described. In the second embodiment, the case where the mass body 120 is press-fitted inside the heat insulator 240 will be described. FIG. 3 is a longitudinal sectional view of the vibration isolation device 200a in the second embodiment. Note that the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted (the same applies in FIG. 4).

[0042] Note that the relationship between the heat insulator 240 and the fastening member 150 (where the inner diameter D1 of the opening 144 is set smaller than the outer diameter D3 of the protruding portion 153) is the same as the relationship between the heat insulator 140 and the fastening member 150 in the first embodiment, and thus the description thereof is omitted.

[0043] As shown in FIG. 3, in the vibration isolator 200a, instead of the heat insulator 140 of the vibration isolator 100a in the first embodiment, the heat insulator 240 is attached to the mass body 120.

[0044] The heat insulator 240 is a stepped cylindrical metal member into which the mass body 120 is press-fitted inward. The heat insulator 240 includes an engaging portion 241 disposed on the first end face 123, a standing portion 142 standing upright from the end portion on the radially inner side of the engaging portion 241 toward one side in the axial direction, a parallel portion 143 protruding perpendicularly radially inward from the end portion on one side in the axial direction of the standing portion 142, and a press-fitting portion 245 extending from the end portion on the radially outer side of the engaging portion 241 toward the other side in the axial direction. The outer diameter of the mass body 120 is set slightly larger than the inner diameter of the press-fitting portion 245 (heat insulator 240) of the heat insulator 240 by the amount of the press-fitting allowance.

[0045] The vibration isolator 200a is manufactured as follows. The cylindrical member 110 and the mass body 120 are vulcanized and adhered by the elastic connecting portion 130, and then the mass body 120 is pushed in from the other side in the axial direction toward one side until the first end face 123 of the mass body 120 abuts against the engaging portion 241 of the heat insulator 240. Thereby, the mass body 120 is press-fitted inside the press-fitting portion 245 (heat insulator 240) and manufactured. Note that the method of attaching the vibration isolator 200a to the mating member A is the same as the method of attaching the vibration isolator 100a to the mating member A in the first embodiment, and thus the description thereof is omitted.

[0046] According to the vibration isolator 200a of the second embodiment, since the mass body 120 is press-fitted into the heat insulator 240, the screw 160 can be dispensed with compared to the vibration isolator 100a of the first embodiment. Therefore, the number of parts of the vibration isolator 200a can be reduced.

[0047] Next, with reference to FIG. 4, the vibration isolation unit 300 and the vibration isolation structure of the vibration isolation unit 300 in the third embodiment will be described. In the first embodiment, the case where the vibration isolation device 100a and the fastening member 150 are separate until they are attached to the mating member A has been described. In contrast, in the third embodiment, the vibration isolation device 300a and the fastening member 150 are integrated into a single product (vibration isolation unit 300), and the case where it is attached to the mating member A in the state of the vibration isolation unit 300 will be described. FIG. 4 is a longitudinal sectional view of the vibration isolation unit 300 in the third embodiment.

[0048] As shown in FIG. 4, the vibration isolation unit 300 is formed by integrating the vibration isolation device 300a and the fastening member 150. In the vibration isolation device 300a, instead of the heat insulator 140 of the vibration isolation device 100a in the first embodiment, a heat insulator 340 is attached to the mass body 120.

[0049] The heat insulator 340 is a stepped cylindrical metal member into which the mass body 120 is press-fitted inward. The heat insulator 340 includes an engagement portion 341 disposed on the first end face 123, a standing portion 342 standing upright from an end portion inside the engagement portion 341 in the radial direction toward one side in the axial direction, a parallel portion 343 protruding perpendicularly inward in the radial direction from an end portion on one side in the axial direction of the standing portion 342, a press-fitting portion 345 extending from an end portion outside the engagement portion 341 in the radial direction toward the other side in the axial direction, and a bent portion 346 protruding inward in the radial direction from an end portion on the other side in the axial direction of the press-fitting portion 345.

[0050] The outer diameter of the mass body 120 is set to be slightly larger than the inner diameter of the press-fitting portion 345 of the heat insulator 340 by the amount of the press-fitting allowance, and the standing portion 342 extends to one side in the axial direction more than the overhanging portion 153 of the fastening member 150.

[0051] The bent portion 346 of the heat insulator 340 is bent toward the second end face 124 of the mass body 120. The parallel portion 343 covers a part of the elastic connection portion 130 inside in the radial direction in the axial direction.

[0052] At the radial center of the parallel portion 343, a circular opening 344 is formed. That is, in the cross-section obtained by cutting the heat insulator 340 in a plane including the axis O, the portion from the engaging portion 341 to the parallel portion 343 is substantially S-shaped, and the portion from the press-fitting portion 345 to the bending portion 346 is substantially L-shaped. The parallel portion 343 is located on one side in the axial direction with respect to the overhanging portion 153 of the fastening member 150.

[0053] Next, the relationship between the heat insulator 340 and the fastening member 150 will be described. A part of the tip side of the parallel portion 343 of the heat insulator 340 and a part of the outer edge side of the overhanging portion 153 of the fastening member 150 overlap each other over the entire circumference in the circumferential direction in the axial view (top view). That is, the inner diameter D4 of the opening 344 is set smaller than the outer diameter D3 of the overhanging portion 153. The inner diameter D4 of the opening 344 is set larger than the outer diameter D2 of the cylindrical member 110.

[0054] The inner diameter D4 of the opening 344 is set larger than the maximum radial distance D5 of the outer surface of the head 152 (in this embodiment, the distance connecting the opposing vertices of the hexagon). That is, a gap is formed over the entire circumference in the circumferential direction between the inner peripheral surface of the opening 344 and the outer surface of the head 152 in the axial view (top view). The gap is set to a size such that when a tool such as a socket wrench or a box wrench for tightening the head 152 is inserted from the opening 344, the tool can be inserted into the opening 344 and the inserted tool can rotate the head 152.

[0055] The shaft portions 347a of the two bolts 347 are inserted into the standing portion 342 of the heat insulator 340 so as to protrude radially inward of the standing portion 342. The bolts 347 are arranged at positions 180° apart in the circumferential direction of the standing portion 342. The bolts 347 are located on the other side in the axial direction than the overhanging portion 153 of the fastening member 150. A part of the tip side of the shaft portion 347a of the bolt 347 and a part of the outer edge side of the overhanging portion 153 of the fastening member 150 overlap with each other in a part of the circumferential direction in the axial view (top view). Note that a rivet may be inserted instead of the bolt 347. Even in this case, a part of the tip side of the rivet and a part of the outer edge side of the overhanging portion 153 of the fastening member 150 overlap with each other in a part of the circumferential direction in the axial view.

[0056] The vibration isolation unit 300 is manufactured as follows. The cylindrical member 110 and the mass body 120 are vulcanized and adhered by the elastic connecting portion 130, and then the fastening member 150 is inserted into the through hole 113 of the cylindrical member 110. In this state, the mass body 120 is pushed from the other side in the axial direction toward the one side until the first end surface 123 of the mass body 120 abuts against the engaging portion 341 of the heat insulator 340. The bent portion 346 of the heat insulator 340 extends on the extension line of the press-fitting portion 345 and on the other side in the axial direction until the mass body 120 is pushed in. After the mass body 120 is pushed into and press-fitted into the press-fitting portion 345, the bent portion 346 is caulked so as to be bent toward the second end surface 124. Finally, the bolts 347 are inserted into two locations of the standing portion 342 so that the shaft portions 347a of the bolts 347 protrude radially inward. Thereby, the vibration isolation unit 300 is manufactured.

[0057] The vibration isolation unit 300 is arranged with the other end surface 112 of the cylindrical member 110 facing the mating member A so that the through hole 113 of the cylindrical member 110 corresponds to the connection hole of the mating member A. In this state, the vibration isolation unit 300 is attached to the mating member A by tightening the head 152 of the fastening member 150 inserted into the through hole 113 of the cylindrical member 110 with a tool such as a socket wrench or a box wrench.

[0058] The vibration isolation unit 300 has the standing portion 342 of the heat insulator 340 extending to one axial side of the overhanging portion 153, and a part of the tip side of the parallel portion 343 of the heat insulator 340 and a part of the outer edge side of the overhanging portion 153 of the fastening member 150 overlapping each other over the entire circumference in the circumferential direction in an axial view (top view). Therefore, it is easy to shield the heat radiated from the vibration isolation unit 300 toward the mating member A from the axial direction, radial direction, or diagonal direction with the heat insulator 340. Thus, the heat shielding effect can be improved compared to the vibration isolation devices 100a of the first embodiment and 200a of the second embodiment, which are difficult to shield the heat radiated from the radial direction or diagonal direction.

[0059] Also, the bolt 347 is located on the other axial side of the overhanging portion 153 of the fastening member 150, and a part of the tip side of the shaft portion 347a of the bolt 347 and a part of the outer edge side of the overhanging portion 153 of the fastening member 150 overlap each other in a part of the circumferential direction in an axial view (top view). Therefore, even when the mass body 120 tries to come off to one axial side, it is easy to bring the overlapping portions of the overhanging portion 153 and the shaft portion 347a into contact with each other in the axial view. Thus, even when the elastic coupling portion 130 is broken and the mass body 120 tries to fall off from the mating member A to the opposite side (one axial side), the fall of the mass body 120 can be suppressed.

[0060] Also, the gap between the inner peripheral surface of the opening 344 and the outer surface of the head 152 in the axial view is set such that when a tool such as a socket wrench or a box wrench for tightening the head 152 from the opening 344 is inserted, the tool can be inserted into the opening 344 and the inserted tool can rotate the head 152. Therefore, the vibration isolation unit 300 can be easily attached to the mating member A. Further, since the inner diameter D4 of the opening 344 is set smaller than the outer diameter D3 of the overhanging portion 153, the standing portion 342 extends to one axial side of the overhanging portion 153, and a part of the tip side of the parallel portion 343 of the heat insulator 340 and a part of the outer edge side of the overhanging portion 153 of the fastening member 150 can overlap each other over the entire circumference in the circumferential direction in an axial view (top view). Thus, both the heat shielding effect of the heat insulator 340 and the ease of attaching the vibration isolation unit 300 to the mating member A can be achieved.

[0061] Although the present invention has been described based on the embodiments above, it is easily conceivable that the present invention is not limited to the above embodiments at all, and various improvements and modifications can be made without departing from the spirit of the present invention.

[0062] In each of the above embodiments, the case where the heat insulator 140 is screwed to the first end face 123 of the mass body 120, the case where the mass body 120 is press-fitted into the heat insulators 240 and 340, and the case where the heat insulator 340 is caulked toward the second end face 124 of the mass body 120 have been described respectively. However, as long as manufacturing is possible, the methods of attaching the heat insulators 140, 240, and 340 to the mass body 120 may employ screwing, press-fitting, caulking, and combinations thereof.

[0063] For example, in the second and third embodiments above, instead of the mass body 120 being press-fitted into the heat insulators 240 and 340, the heat insulators 240 and 340 may be screwed to the outer peripheral surface 122 of the mass body 120, or may be screwed to the first end face 123 of the mass body 120.

[0064] Also, for example, in each of the above embodiments, the heat insulators 140, 240, and 340 may be caulked by the protrusions provided on the mass body 120. In this case, protrusions are formed on the first end face 123 and the second end face 124 of the mass body 120. The protrusions are inserted into the holes provided in the heat insulators 140 and 340, and by crushing the protrusions in that state, the heat insulators 140 and 340 are attached to the mass body 120.

[0065] In each of the above embodiments, the fastening member 150 has been described as a hexagonal bolt. However, the fastening member 150 may be a bolt with a hexagonal socket. In this case, a hexagonal bar wrench can be used as the tool. In this case, for example, in the third embodiment, the gap required to fasten the fastening member 150 with a tool (the gap between the inner peripheral surface of the opening 344 and the outer surface of the head 152 in the axial direction view) can be reduced. Thereby, it becomes easier to further shield the heat radiated from the axial direction, radial direction, and diagonal direction toward the mating member A by the heat insulator 340. Therefore, the heat shielding effect can be improved.

[0066] In each of the above embodiments, the case where the heat insulators 140, 240, 340 and the overhanging portion 153 overlap over the entire circumference in the circumferential direction in the axial direction view has been described. However, the heat insulators 140, 240, 340 and the overhanging portion 153 may overlap in a part of the circumferential direction in the axial direction view.

[0067] In each of the above embodiments, the case where the inner diameters D1, D4 of the openings 144, 344 are set to be smaller than the outer diameter D3 of the overhanging portion 153 has been described. However, the inner diameters D1, D4 of the openings 144, 344 may be set to be equal to or larger than the outer diameter D3 of the overhanging portion 153.

[0068] In each of the above embodiments, the case where the outer diameter D3 of the overhanging portion 153 is set to be larger than the outer diameter D2 of the cylindrical member 110 has been described. However, the outer diameter D3 of the overhanging portion 153 may be set to be equal to or smaller than the outer diameter D2 of the cylindrical member 110.

[0069] In each of the above embodiments, the case where the fastening member 150 includes the overhanging portion 153 has been described. However, the fastening member 150 may not include the overhanging portion 153. In this case, it is preferable that the minimum distance in the radial direction of the outer shape of the head 152 of the screw (for example, the two-face width when the head 152 is hexagonal) is set to be larger than the outer diameter D2 of the cylindrical member 110. Thereby, it becomes easier to shield the heat radiated toward the mating member A in the axial direction by the head 152. Therefore, the heat shielding effect can be improved.

[0070] In each of the above embodiments, the case where the openings 144 and 344 are circular has been described, but the present invention is not limited to this. The openings 144 and 344 may be elliptical or polygonal.

[0071] In each of the above embodiments, the case where a part of the parallel portions 143 and 343 of the heat insulators 140, 240, and 340 and the overhanging portions 153 of the fastening members 150 overlap each other in the entire circumference in the axial direction view has been described, but they may overlap each other only in a part of the circumferential direction in the axial direction view.

[0072] In each of the above embodiments, the case where the fastening member 150 includes the overhanging portion 153 has been described, but the fastening member 150 may not include the overhanging portion 153. Instead of the overhanging portion 153, a washer is sandwiched between one end surface 111 of the cylindrical member 110 and the fastening member 150. In this case, a part of the washer projects radially outward from the outer peripheral surface 114 of the cylindrical member 110. Further, the cylindrical member 110 itself may include an overhanging portion that projects radially inward from the one end surface 111.

[0073] In any case where the fastening member 150 does not include the overhanging portion 153 or the cylindrical member 110 itself includes the overhanging portion, in the axial direction, the parallel portion 143 or the shaft portion 347a of the bolt 347 is located on the other side in the axial direction from the overhanging portion of the washer or the cylindrical member 110, and the shaft portion 347a of the parallel portion 143 or the bolt 347 and the overhanging portion of the washer or the cylindrical member 110 overlap each other in the axial direction view.

[0074] In each of the above embodiments, the case where the inner diameters D1 and D4 of the openings 144 and 344 are set to be larger than the outer diameter D2 of the cylindrical member 110 has been described. However, the inner diameters D1 and D4 of the openings 344 may be set to be equal to or smaller than the outer diameter D2 of the cylindrical member 110. In this case, in the first and second embodiments, the parallel portion 143 is located on one side of the protruding portion 153 in the axial direction. Also, the fastening member 150 is configured not to include the protruding portion 153. In this case, in the axial view, the heat insulators 140 and 340 (parallel portions 143 and 343) overlap with all of one side of the elastic coupling portion 130. Therefore, the heat shielding effect can be improved regardless of the shape of the fastening member 150.

[0075] In the above-described third embodiment, the case where the bolts 347 for preventing the mass body 120 from falling off the cylindrical member 110 are provided at two locations separated by 180° in the circumferential direction on the heat insulator 340 (standing portion 342) has been described. However, the bolts 347 may be provided at three or more equally spaced locations in the circumferential direction. Also, the bolts 347 may be omitted.

Explanation of Reference Numerals

[0076] 100a, 200a, 300a Vibration isolator 110 Cylindrical member 114 Outer peripheral surface 120 Mass body 121 Inner peripheral surface 123 First end surface (end surface) 130 Elastic coupling portion 140, 240, 340 Heat insulator 150 Fastening member 151 Shaft portion 152 Head portion 153 Protruding portion 300 Vibration isolation unit 342 Standing portion (first portion) 343 Parallel portion (second portion) 344 Opening 347a Shaft portion (protruding portion) A Counterpart member O Axis

Claims

1. A cylindrical tubular member that extends from one axial direction to the other and is fixed to the mating member with the other side facing the mating member; A cylindrical mass body whose inner peripheral surface is arranged at a predetermined interval from the outer peripheral surface of the tubular member; An elastic connecting portion composed of an elastic body that connects the inner peripheral surface of the mass body and the outer peripheral surface of the tubular member; In a vibration isolation device including a heat insulator that covers at least a part of the one side of the elastic connecting portion in an axial view seen from the one side toward the other side, The vibration isolation device, wherein the heat insulator is attached to the mass body.

2. The vibration isolation device according to claim 1, wherein the heat insulator is attached to an end surface on the one side of the mass body.

3. A vibration isolation structure using the vibration isolation device according to claim 1 or 2, Comprising a fastening member that is inserted from the one side to the other side of the tubular member and fixes the tubular member to the mating member, The fastening member includes a columnar shaft portion inserted into the tubular member, a head portion that projects radially outward from an end portion on the one side of the shaft portion, and an overhanging portion that projects radially outward from the outer surface of the head portion more than the outer peripheral surface, and is characterized by the vibration isolation structure.

4. The heat insulator is located on the other side of the overhanging portion, The vibration isolation structure according to claim 3, wherein the overhanging portion and the heat insulator overlap each other at least partially in the circumferential direction in the axial view.

5. The vibration isolation structure according to claim 4, wherein the overhanging portion and the heat insulator overlap each other over the entire circumference in the axial view.

6. A vibration isolation unit including the vibration isolation device according to claim 1 or 2 and a fastening member that is inserted from the one side to the other side of the tubular member and fixes the tubular member to the mating member, The fastening member includes a columnar shaft portion inserted into the tubular member and a head portion that projects radially outward from an end portion on the one side of the shaft portion, The heat insulator includes a first portion that extends to the one side beyond a portion where the radial distance is the maximum among the head portions, and a second portion that projects radially inward from an end portion on the one side of the first portion and has an opening formed at the center. The vibration isolator unit is characterized in that, in the axial view, all of one side of the elastic coupling part is covered by the second part or the second part and the fastening member.

7. The fastening member includes an overhanging portion that protrudes radially outward from the outer surface of the head portion beyond the outer peripheral surface. The first part is located on the other side of the overhanging portion and includes a protruding portion that protrudes radially inward. The vibration isolator unit according to claim 6, wherein the overhanging portion and the protruding portion overlap each other at at least a part in the circumferential direction in the axial view.

8. The overhanging portion and the second part overlap each other entirely in the axial view. The vibration isolator unit according to claim 7, wherein the second part and the head portion have a gap between the inner peripheral surface of the opening of the second part and the outer surface of the head portion in the axial view.

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