Insulator and manufacturing method of the same

Abstract

To provide an art which inhibits damage of a fastening part of an insulator.SOLUTION: An insulator for covering at least a part of an outer peripheral surface of an on-vehicle component includes: an inner member; an outer member; a contact part; a separation part; a fastening part; and a reinforcement member. The outer member is arranged so as to overlap with an outer peripheral surface of the inner member. The contact part is a portion where the inner member and the outer member contact with each other. The separation part is a portion where the inner member and the outer member separate from each other and forms an internal space between the inner member and the outer member. The fastening part is a portion configured to be fastened to the on-vehicle component and is provided at the separation part. The reinforcement member is disposed around the fastening part, disposed in the internal space, and sandwiched by the inner member and the outer member.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to an insulator and a method for manufacturing an insulator. [Background technology]

[0002] 2. Description of the Related Art It is known to attach an insulator to cover the outer peripheral surface of an exhaust manifold in order to insulate the exhaust manifold from heat and noise generated by exhaust gas passing through the inside of the exhaust manifold.

[0003] Patent Document 1 discloses an insulator that is fixed to the outer peripheral surface of an exhaust manifold with bolts. This insulator has a laminated structure of two metal plates and a vibration-damping material made of inorganic fibers sandwiched between the two metal plates. The insulator is provided with a through hole through which the bolt is inserted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-360496 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the exhaust manifold vibrates due to vibrations caused by engine operation, the vibrations are transmitted to the insulator, which is fixed to the exhaust manifold by the bolts as described above, via the bolts. This causes stress to concentrate around the through holes, i.e., around the fastening parts of the insulator to the exhaust manifold. As a result, there is a problem in that the fastening parts of the insulator are easily damaged by the stress.

[0006] An object of one aspect of the present disclosure is to provide a technique for suppressing damage to a fastening portion of an insulator. [Means for solving the problem]

[0007] One aspect of the present disclosure is an insulator for covering at least a portion of an outer peripheral surface of an on-vehicle component, the insulator comprising an inner member, an outer member, a contact portion, a separation portion, a fastening portion, and a reinforcing member. The inner member faces the outer peripheral surface. The outer member is arranged overlapping the inner outer peripheral surface of the inner member. The contact portion is a portion where the inner member and the outer member abut. The separation portion is a portion where the inner member and the outer member are separated, forming an internal space between the inner member and the outer member. The fastening portion is a portion configured to be fastened to the on-vehicle component, and is provided in the separation portion. The reinforcing member is arranged around the fastening portion, arranged in the internal space, and sandwiched between the inner member and the outer member.

[0008] In this configuration, the reinforcing member increases the thickness of the insulator around the fastening portion, which tends to improve the strength of the fastening portion and therefore makes it possible to suppress damage to the fastening portion of the insulator even if stress is concentrated at the fastening portion.

[0009] In one aspect of the present disclosure, at least one of the inner member and the outer member may have a recess for disposing the reinforcing member. With this configuration, the recess can suppress misalignment of the reinforcing member.

[0010] In one aspect of the present disclosure, the on-vehicle component may be an exhaust pipe through which exhaust gas from an internal combustion engine passes. With this configuration, it is possible to suppress damage to a fastening portion of an insulator that is fastened to the exhaust pipe.

[0011] One aspect of the present disclosure is a method for manufacturing an insulator for covering at least a portion of an outer peripheral surface of an on-vehicle component, the insulator comprising an inner member, an outer member, an abutment portion, a separation portion, a fastening portion, and a reinforcing member. The inner member faces the outer peripheral surface. The outer member is arranged overlapping the inner outer peripheral surface of the inner member. The abutment portion is a portion where the inner member and the outer member abut. The separation portion is a portion where the inner member and the outer member are separated, forming an internal space between the inner member and the outer member. The fastening portion is a portion configured to be fastened to the on-vehicle component, and is provided in the separation portion. The reinforcing member is arranged around the fastening portion and in the internal space. The method for manufacturing the insulator comprises forming the abutment portion, forming the separation portion, forming the fastening portion, and sandwiching the reinforcing member between the inner member and the outer member.

[0012] In this configuration, the reinforcing member increases the thickness of the insulator around the fastening portion, which tends to improve the strength of the fastening portion and therefore makes it possible to suppress damage to the fastening portion of the insulator even if stress is concentrated at the fastening portion.

[0013] In one aspect of the present disclosure, the inner member may be pressed together with the outer member to deform at least one of the inner member and the outer member to form the abutment portion and the separation portion, while the reinforcing member is disposed in the internal space by the press processing, and the reinforcing member may be sandwiched between the inner member and the outer member. With this configuration, the reinforcing member is sandwiched between the inner member and the outer member by the press processing, and thus it is possible to suppress misalignment of the reinforcing member.

[0014] According to an aspect of the present disclosure, a recess for forming at least a part of the internal space may be formed in at least one of the inner member and the outer member by pre-processing using a press. After the reinforcing member is placed in the recess, the press processing may be performed. According to this configuration, the recess can suppress misalignment of the reinforcing member during the press processing. [Brief description of the drawings]

[0015] [Figure 1] FIG. 4 is a side view of the exhaust system component, showing one fastening portion of the insulator as viewed from the front. [Diagram 2] FIG. 2 is a side view of the exhaust system component with two fastening portions of the insulator visible. [Diagram 3] FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Diagram 5] Fig. 5A is a diagram showing the state before and after the press working in the first forming step, and Fig. 5B is a diagram showing the state before and after the press working in the second forming step. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Exhaust system component configuration] 1 to 3 is a component that constitutes at least a part of a flow path for passing exhaust gas from an internal combustion engine mounted on a vehicle. The exhaust system component 100 includes an upstream exhaust pipe 1, an upstream cone 2, a catalyst case 3, a downstream cone 4, a downstream exhaust pipe 5, an insulator 6, and two brackets 7.

[0017] The upstream exhaust pipe 1 is a metal pipe, and forms an exhaust flow passage into which exhaust gas from an internal combustion engine flows. The upstream cone 2 is a cylindrical metal member, and is connected to the downstream end of the upstream exhaust pipe 1. The upstream cone 2 has a tapered shape in which the cross-sectional area in a cross section perpendicular to the flow direction of the exhaust gas increases toward the downstream side.

[0018] The catalyst case 3 is a cylindrical metal member, and is connected to the downstream end of the upstream cone 2. The catalyst case 3 accommodates therein a catalyst (not shown) for purifying exhaust gas. The downstream cone 4 is a cylindrical metal member, and is connected to the downstream end of the catalyst case 3. The downstream cone 4 has a tapered shape in which the cross-sectional area in a cross section perpendicular to the flow direction of the exhaust gas becomes smaller toward the downstream side.

[0019] The downstream exhaust pipe 5 is a metal pipe that forms an exhaust flow path for discharging exhaust gas purified by the catalyst. The downstream exhaust pipe 5 is connected to the downstream end of the downstream cone 4. Although details will be described later, the insulator 6 is a plate-like member arranged to cover part of the outer peripheral surface 31 of the catalyst case 3 while leaving a gap between it and the outer peripheral surface 31 of the catalyst case 3. The insulator 6 is rectangular in a plan view and curves in an arc along the outer peripheral surface 31 of the catalyst case 3. The insulator 6 suppresses heat radiation from the catalyst case 3 caused by the passage of exhaust gas. In the following description, the direction extending approximately parallel to the flow direction of the exhaust gas in the insulator 6 is simply referred to as the flow direction D1.

[0020] The bracket 7 is a member disposed between the catalyst case 3 and the insulator 6, and fixes the insulator 6 to the catalyst case 3 while being spaced apart from the outer circumferential surface 31 of the catalyst case 3. In this embodiment, two brackets 7 are used to fix the insulator 6.

[0021] As shown in FIG. 4, the bracket 7 is a plate-like member and has a shape curved into a substantially U-shape. The bracket 7 has a joint portion 71, two side wall portions 72, and two flange portions 73. The joint portion 71 has a joint surface 711 for joining the insulator 6, and a through hole 712. The two side wall portions 72 extend from the joint portion 71 in the extension direction. The extension direction is a direction extending from the joint portion 71 toward the opposite side to the joint surface 711. The two side wall portions 72 face each other with a gap therebetween. The two flange portions 73 extend from the respective tips of the two side wall portions 72 in the extension direction. The two flange portions 73 extend in directions away from each other. Each flange portion 73 is joined to the outer circumferential surface 31 of the catalyst case 3 by welding or the like.

[0022] <Insulator> As shown in FIG. 4, the insulator 6 includes an inner member 10, an outer member 20, a contact portion 30, a spaced portion 40, a fastening portion 50, a crimping portion 60, and a reinforcing member .

[0023] The inner member 10 is a plate-shaped metal member, and faces the outer circumferential surface 31 of the catalyst case 3. The outer member 20 is a plate-like metal member, and is disposed so as to overlap the outer peripheral surface 11 of the inner member 10. The inner member 10 and the outer member 20 are joined in an overlapping state by a crimping portion 60, which will be described later. The inner member 10 and the outer member 20 are each curved in an arc shape along the outer peripheral surface 31 of the catalyst case 3.

[0024] The contact portion 30 is a portion where the inner member 10 and the outer member 20 contact each other. Specifically, the contact portion 30 is a portion where the inner peripheral surface of the outer member 20 comes into surface contact with the outer peripheral surface 11 of the inner member 10.

[0025] The separation portion 40 is a portion where the inner member 10 and the outer member 20 are separated. The separation portion 40 forms an internal space 14 between the inner member 10 and the outer member 20. In this embodiment, the separation portion 40 is formed by arranging a recess 101 of the inner member 10 and a recess 201 of the outer member 20 facing each other. The recess 101 of the inner member 10 and the recess 201 of the outer member 20 each protrude in a direction away from each other when the inner member 10 and the outer member 20 are overlapped. The recess 101 of the inner member 10 and the recess 201 of the outer member 20 are each a portion for arranging a reinforcing member 70 described later.

[0026] As shown in Figs. 1 and 2, the spaced portion 40 is provided so as to be located approximately in the center of the insulator 6 in the flow direction D1. The spaced portion 40 is surrounded by the abutment portion 30. As shown in Fig. 3, in this embodiment, two spaced portions 40 are provided at an interval in the circumferential direction of the insulator 6. The circumferential direction of the insulator 6 is the circumferential direction going around the central axis A of the catalyst case 3. In the following description, the circumferential direction of the insulator 6 is simply referred to as the circumferential direction D2. The spaced portion 40 is formed, for example, in a quadrangular shape in a plan view. The shape of the spaced portion may be various shapes.

[0027] The fastening portion 50 is a portion configured to be fastened to the catalyst case 3. As shown in Fig. 4, the fastening portion 50 is provided in the separated portion 40. In this embodiment, a fastening portion 50 is provided in each of the two separated portions 40. Each fastening portion 50 has a through hole 51 that penetrates the inner member 10 and the outer member 20 in the thickness direction, which is the direction in which the inner member 10 and the outer member 20 overlap.

[0028] As shown in Fig. 3, in the insulator 6 that covers about 1 / 3 of the entire circumference of the outer circumferential surface 31 of the catalyst case 3, the two fastening portions 50 are disposed approximately 90° apart from each other in the circumferential direction D2 with the center points of the respective through holes 51 as references. Note that in the example shown in Fig. 3, both end edges of the insulator 6 in the circumferential direction D2 are positioned approximately 134° apart. Note that the above-mentioned angle is merely an example and can be changed as appropriate.

[0029] 4, the insulator 6 is placed on the joined surface 711 of the bracket 7 so as to cover the catalyst case 3 with the through hole 51 of the fastening portion 50 overlapping the through hole 712 of the bracket 7. Then, the insulator 6 is fastened to the catalyst case 3 via the bracket 7 using the bolts 52 inserted into the through holes 51, 712 and the nuts 53 fixed to the tips of the bolts 52. In this embodiment, the heads of the bolts 52 are disposed on the outer circumferential surface side of the insulator 6, and the nuts 53 are disposed between the catalyst case 3 and the bracket 7. Note that the heads of the bolts 52 may be disposed between the catalyst case 3 and the bracket 7, and the nuts 53 may be disposed on the outer circumferential surface side of the insulator 6.

[0030] The crimped portion 60 is a portion that joins the inner member 10 and the outer member 20. The crimped portion 60 is provided at both ends of the insulator 6 in the flow direction D1. Specifically, the two crimped portions 60 are disposed on both sides of the spaced portion 40 in the flow direction D1. In this embodiment, as shown in FIG. 1, the crimped portion 60 is provided only at the positions where the spaced portion 40 is provided in the circumferential direction D2 at both ends of the insulator 6 in the flow direction D1. The crimped portion may be provided over the entire range from end to end along the circumferential direction D2 at both ends of the insulator 6 in the flow direction D1. The crimped portion may also be provided at the ends of the insulator 6 in the circumferential direction D2.

[0031] The reinforcing member 70 is made of a steel plate. Specifically, the reinforcing member 70 may be a steel material that is not corrosion resistant, such as SPH or SPC, or a steel material that is corrosion resistant, such as SUS or aluminum. The steel material may be plated or painted to impart corrosion resistance. The thickness of the reinforcing member 70 is preferably greater than the thickness of the inner member 10 or the thickness of the outer member 20.

[0032] As shown in FIG. 4, the reinforcing member 70 is disposed around the fastening portion 50 and in the internal space 14. Specifically, the reinforcing member 70 is disposed in the internal space 14 so as to surround the through hole 51. The reinforcing member may surround the entire through hole 51 or may surround only a portion of the through hole 51. In this embodiment, the reinforcing member 70 is disposed in the internal space 14 with a gap remaining in the internal space 14. The reinforcing member 70 is sandwiched between the inner member 10 and the outer member 20 while disposed in the internal space 14.

[0033] [2. Manufacturing method of insulator] Next, a method for manufacturing the insulator 6 will be described with reference to Figures 5A and 5B. In this embodiment, the inner member 10, the outer member 20, and the reinforcing member 70 are integrally molded by press working to manufacture the insulator 6. The method for manufacturing the insulator 6 of this embodiment includes a first molding step and a second molding step. Note that Figures 5A and 5B show a cross section along the flow direction D1 at a portion where the separation portion 40 of the insulator 6 is formed.

[0034] <1st molding process> 5A, a flat inner member 10 before processing is pressed to form a recess 101 and a crimping front portion 102 in the inner member 10. In the following description, the inner member 10 in which the recess 101 and the crimping front portion 102 are formed is referred to as the inner member 10 after processing.

[0035] The recess 101 is provided so as to be located approximately in the center of the inner member 10 in the flow direction D1, and protrudes toward the first side (i.e., the downward side in FIG. 5A). The crimped front portions 102 are provided at both ends of the inner member 10 in the flow direction D1. The crimped front portions 102 are portions where the ends of the inner member 10 in the flow direction D1 are bent toward the second side (i.e., the upward side in FIG. 5A), which is opposite the first side. In the inner member 10 after processing, the side from which the crimped front portions 102 extend, i.e., the surface on the second side, is the outer circumferential surface 11 of the inner member 10.

[0036] <Second forming process> 5B, a reinforcing member 70 is disposed between the processed inner member 10 and the unprocessed flat plate-like outer member 20. Specifically, the reinforcing member 70 is disposed in the recess 101 of the processed inner member 10. Then, the unprocessed outer member 20 is disposed overlapping the outer peripheral surface 11 of the inner member 10 with the reinforcing member 70 sandwiched therebetween.

[0037] Thereafter, the processed inner member 10 is pressed together with the unprocessed flat outer member 20 to form the contact portion 30, the separation portion 40, the crimping portion 60, and the fastening portion 50, while the reinforcing member 70 is sandwiched between the inner member 10 and the outer member 20 by the press processing. In this embodiment, the contact portion 30, the separation portion 40, the crimping portion 60, and the fastening portion 50 are formed in one step, that is, simultaneously.

[0038] In this embodiment, the press working deforms the flat outer member 20 before processing, and forms the contact portion 30 and the separation portion 40. Specifically, the press working forms a recess 201 protruding to the second side at a position facing the reinforcing member 70 in the flat outer member 20 before processing, thereby forming the contact portion 30 and the separation portion 40.

[0039] Furthermore, by the press process, each crimping front portion 102 is folded in a state in which both ends of the outer member 20 in the flow direction D1 are sandwiched inside, forming two crimping portions 60. As a result, by the press process, the reinforcing member 70 is sandwiched between the inner member 10 and the outer member 20 with the reinforcing member 70 disposed in the internal space 14.

[0040] Furthermore, the fastening portion 50 is formed in the separated portion 40 by press working. Specifically, as the fastening portion 50, a through hole 51 penetrating the inner member 10 and the outer member 20 is formed by press working so as to also penetrate the reinforcing member 70.

[0041] This completes the manufacture of the insulator 6 in which the inner member 10, the outer member 20 and the reinforcing member 70 are integrally formed by press working.

[0042] [3. How to fasten the insulator to the catalyst case] The insulator 6 manufactured as described above is fixed to the catalyst case 3 via the bracket 7 fixed to the outer peripheral surface 31 of the catalyst case 3 by welding or the like. Specifically, the through hole 51 of the fastening portion 50 is aligned with the through hole 712 of the bracket 7, and the insulator 6 is disposed so as to cover the catalyst case 3. Then, bolts 52 are inserted into the through holes 51, 712, and nuts 53 are fixed to the tips of the bolts 52, thereby fastening the insulator 6 to the catalyst case 3.

[0043] [4. Effects] According to the embodiment described above in detail, the following effects can be obtained. (4a) In this embodiment, the insulator 6 includes a spaced portion 40, and the fastening portion 50 is provided in the spaced portion 40. The reinforcing member 70 is disposed around the fastening portion 50 and in the internal space 14 formed in the spaced portion 40. This increases the thickness of the insulator 6 around the fastening portion 50, which makes it easier to improve the strength of the fastening portion 50. Therefore, even if stress is concentrated on the fastening portion 50 due to vibration transmitted through the bolt 52 when the catalyst case 3 vibrates due to vibration during engine operation, for example, damage to the fastening portion 50 of the insulator 6 can be suppressed. In addition, by making the plate thickness of the reinforcing member 70 larger than the plate thickness of the inner member 10 or the plate thickness of the outer member 20, damage to the fastening portion 50 can be further suppressed.

[0044] (4b) In this embodiment, the insulator 6 includes the contact portion 30 and the spaced portion 40, and the reinforcing member 70 increases only the thickness around the fastening portion 50 provided in the spaced portion 40. This makes it possible to increase the thickness around the fastening portion 50 that requires reinforcement while suppressing an increase in the thickness of the portion that does not require reinforcement. This makes it possible to suppress damage to the fastening portion 50 while suppressing an increase in the weight of the insulator 6 as a whole.

[0045] (4c) In the present embodiment, the inner member 10 is press-formed together with the outer member 20 in a state in which the reinforcing member 70 is disposed in the recess 101 of the inner member 10. Therefore, it is possible to suppress misalignment of the reinforcing member 70 during the press forming.

[0046] (4d) In the present embodiment, the reinforcing member 70 is sandwiched between the inner member 10 and the outer member 20 by press working. This makes it possible to suppress misalignment of the reinforcing member 70 in the internal space 14. Also, since there is no need to fix the reinforcing member 70 to at least one of the inner member 10 and the outer member 20 by welding or the like, the insulator 6 of the present embodiment can be formed with fewer steps.

[0047] (4e) In this embodiment, the contact portion 30, the separating portion 40, the crimping portion 60, and the fastening portion 50 are formed in one step, that is, simultaneously. Therefore, the insulator 6 of this embodiment can be easily molded with fewer steps.

[0048] (4f) In the present embodiment, the reinforcing member 70 is disposed in the internal space 14 with a gap remaining in the internal space 14. Therefore, the gap can improve the heat insulating effect.

[0049] (4g) In the present embodiment, the reinforcing member 70 is surrounded by the inner member 10, the outer member 20, the bracket 7, the bolts 52, and the nuts 53, and is therefore less susceptible to the effects of the external environment. This makes it possible to suppress oxidation of the reinforcing member 70.

[0050] In this embodiment, the catalyst case 3 corresponds to an example of an on-vehicle part, the outer peripheral surface 11 of the inner member 10 corresponds to an example of an inner outer peripheral surface, and the recesses 101 and 102 correspond to examples of recesses. Also, the press working in the first molding step corresponds to an example of pre-processing, and the press working in the second molding step corresponds to an example of press working.

[0051] 5. Other embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take various forms.

[0052] (5a) In the above embodiment, the insulator 6 is fastened to the catalyst case 3, but the part to which the insulator 6 is fastened is not limited to this. For example, the insulator 6 may be fastened to an exhaust pipe or an exhaust manifold.

[0053] (5b) In the above embodiment, the insulator 6 covers a portion of the outer circumferential surface 31 of the catalyst case 3. However, for example, the insulator may cover the entire outer circumferential surface 31.

[0054] (5c) In the above embodiment, the inner member 10 has the recess 101, and the outer member 20 has the recess 201. However, for example, the recess may be formed in either the inner member or the outer member. Also, in the above embodiment, the recess 101 is formed in the inner member 10 in the first molding step, and the recess 201 is formed in the outer member 20 in the second molding step, but the method of forming the recess is not limited to this. For example, the recess may be formed in the outer member before the second molding step, and the recess may be formed in the inner member 10 in the second molding step. That is, in the second molding step, only one of the inner member and the outer member may be deformed to form the abutting portion and the separating portion.

[0055] Also, for example, a reinforcing member may be disposed at a predetermined position between an inner member and an outer member that do not have a recess, and the inner member may be press-processed together with the outer member to form a recess in at least one of the inner member and the outer member. That is, in the second molding step, the contact portion and the separation portion may be formed by deforming one or both of the inner member and the outer member.

[0056] (5d) In the above embodiment, the contact portion 30, the separation portion 40, the crimping portion 60, and the fastening portion 50 are formed in one process, i.e., simultaneously. However, for example, the contact portion 30, the separation portion 40, the crimping portion 60, and the fastening portion 50 may be formed in separate processes at different times. For example, the contact portion 30 and the separation portion 40 may be formed first in a second molding process, the crimping portion 60 may be formed in another molding process, and the fastening portion 50 may be formed in yet another molding process. Note that when the contact portion 30, the separation portion 40, the crimping portion 60, and the fastening portion 50 are formed in separate molding processes, the order of formation is not limited to the order described above.

[0057] (5e) In the above embodiment, the through hole 51 of the fastening portion 50 is formed in the press working in the second molding step, but for example, the through hole may already be provided in the inner member 10 and the outer member 20 before the second molding step. In this case, the reinforcing member 70 is disposed around the through hole so as not to overlap the through hole.

[0058] (5f) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0059] 1...upstream exhaust pipe, 2...upstream cone, 3...catalyst case, 4...downstream cone, 5...downstream exhaust pipe, 6...insulator, 7...bracket, 10...inner member, 20...outer member, 11,31...outer peripheral surface, 14...internal space, 30...contact portion, 40...separation portion, 50...fastening portion, 51,712...through hole, 52...bolt, 53...nut, 60...crimping portion, 70...reinforcing member, 71...joined portion, 72...side wall portion, 73...flange portion, 100...exhaust system part, 101,201...recess, 102...crimping front portion, 711...joined surface, D1...flow direction, D2...circumferential direction.

Claims

1. An insulator for covering at least a part of an outer circumferential surface of an in-vehicle component, an inner member facing the outer circumferential surface; an outer member disposed on an inner outer peripheral surface of the inner member; a contact portion where the inner member and the outer member contact each other; a separation portion that is a portion where the inner member and the outer member are separated and that forms an internal space between the inner member and the outer member; A fastening portion configured to be fastened to the on-vehicle component and provided in the separated portion; a reinforcing member disposed around the fastening portion, disposed in the internal space, and sandwiched between the inner member and the outer member; An insulator comprising:

2. 2. The insulator according to claim 1, At least one of the inner member and the outer member has a recess for locating the reinforcing member.

3. The insulator according to claim 1 or 2, The insulator, wherein the on-vehicle part is an exhaust pipe through which exhaust gas from an internal combustion engine passes.

4. A method for manufacturing an insulator for covering at least a part of an outer circumferential surface of an in-vehicle component, comprising the steps of: The insulator comprises: an inner member facing the outer circumferential surface; an outer member disposed on an inner outer peripheral surface of the inner member; a contact portion where the inner member and the outer member contact each other; a separation portion that is a portion where the inner member and the outer member are separated and that forms an internal space between the inner member and the outer member; A fastening portion configured to be fastened to the on-vehicle component and provided in the separated portion; A reinforcing member is disposed around the fastening portion and in the internal space, forming the abutment portion; forming the spaced portion; forming the fastening portion; sandwiching the reinforcing member between the inner member and the outer member; A method for manufacturing an insulator comprising the steps of:

5. A method for manufacturing the insulator according to claim 4, comprising the steps of: The inner member is pressed together with the outer member to deform at least one of the inner member and the outer member to form the contact portion and the spaced portion, The method for manufacturing an insulator includes the steps of: sandwiching the reinforcing member between the inner member and the outer member by the press working, with the reinforcing member disposed in the internal space.

6. A method for manufacturing the insulator according to claim 5, comprising the steps of: The method further includes forming a recess for forming at least a part of the internal space in at least one of the inner member and the outer member by pre-processing using a press, the press working is performed after the reinforcing member is placed in the recess.

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