Exhaust component

Abstract

To inhibit foreign objects from entering from a through hole for positioning.SOLUTION: An exhaust component is mounted on a vehicle and includes: a passage forming member which forms an exhaust passage; an insulator; through holes; and cover members. The insulator is a plate member which covers an outer peripheral surface of the passage forming member. Each through hole is a portion penetrating through the insulator and used for positioning the insulator when the insulator is attached to the passage forming member. The cover members are provided between the passage forming member and the insulator. Each cover member is a member which has a cushioning property and allows a liquid to penetrate therethrough and arranged so as to cover the through hole.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to an exhaust component that is mounted on a vehicle and allows exhaust gas from the vehicle to flow downstream. [Background technology]

[0002] As disclosed in Patent Document 1, there is known an exhaust part (e.g., a catalytic converter) for a vehicle in which a heat shield plate is joined to the outer peripheral surface via a bracket. The heat shield plate of Patent Document 1 has a through hole formed therein, and when joining the heat shield plate to the outer peripheral surface of the exhaust part, the heat shield plate is positioned by engaging an engagement protrusion of a jig with the through hole, and then the heat shield plate is welded to the bracket. This allows the heat shield plate to be maintained in alignment with the outer surface of the bracket during welding, and can suppress welding defects. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-273542 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, after the exhaust part is mounted on the vehicle, there is a risk that foreign matter may enter the inside of the heat shield through the through-holes in the heat shield. In one aspect of the present disclosure, it is desirable to prevent foreign matter from entering through the positioning through-holes. [Means for solving the problem]

[0005] One aspect of the present disclosure is an exhaust part that is mounted on a vehicle and configured to allow exhaust gas to flow downstream, the exhaust part including a flow path forming member, an insulator, a through hole, and a covering member. The flow path forming member forms a flow path for the exhaust gas. The insulator is a plate-shaped member that covers an outer peripheral surface of the flow path forming member. The through hole is a portion that penetrates the insulator and is a portion that is used to position the insulator when attaching the insulator to the flow path forming member. The covering member is provided between the flow path forming member and the insulator. The covering member is a member that has cushioning properties and is permeable to liquid, and is arranged to cover the through hole.

[0006] According to the above-mentioned configuration, the covering member is provided so as to cover the positioning through hole, and therefore it is possible to prevent foreign matter from entering through the positioning through hole. In addition, since the covering member has cushioning properties and is permeable to liquids, it is possible to discharge liquids such as condensed water to the outside of the insulator through the through hole and to absorb vibrations.

[0007] In one aspect of the present disclosure, the covering member may be disposed at a distance from the through hole. According to the above configuration, the positioning jig can be smoothly inserted into the through hole. In one aspect of the present disclosure, the covering member may be a wire mesh and bonded to the inner circumferential surface of the insulator.

[0008] According to the above-mentioned configuration, liquid such as condensed water accumulated between the insulator and the flow passage forming member can be efficiently discharged to the outside of the insulator through the through hole, and vibrations can be efficiently absorbed by the covering member.

[0009] According to an aspect of the present disclosure, the fuel cell assembly may further include a bracket provided on an outer circumferential surface of the flow passage forming member. The bracket may be joined to the insulator. According to the above configuration, the insulator can be attached to the flow passage forming member in a good manner.

[0010] In one aspect of the present disclosure, the through-hole may be positioned to be located at least one of the upper portion or the lower portion when the exhaust component is mounted on a vehicle. According to the above configuration, when the through hole is located at the upper part, the covering member can effectively prevent foreign matter from entering the gap between the flow path forming member and the insulator through the through hole, and when the through hole is located at the lower part, liquid such as condensed water accumulated between the insulator and the flow path forming member can be effectively discharged to the outside of the insulator through the through hole. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is an explanatory diagram of an exhaust flow path in a vehicle. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a perspective view of an exhaust component. [Figure 4] FIG. [Diagram 5] 5 is a cross-sectional view of FIG. 4 . [Figure 6] 13 is a cross-sectional view perpendicular to the axis of a bulge portion and a covering member in an exhaust part according to a modified example. FIG. [Figure 7] 13 is a cross-sectional view perpendicular to the axis of a bulge portion and a covering member in an exhaust part according to another embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Exhaust component configuration] The exhaust part 1 of this embodiment is mounted on a vehicle and constitutes a part of the flow path 5 of the exhaust generated by the engine of the vehicle (FIG. 1). Specifically, for example, the exhaust part 1 is provided in a section where relatively high-temperature exhaust flows, and as one example, a plurality of exhaust parts 1 are provided upstream of the muffler 4 in the exhaust flow direction (hereinafter, simply referred to as the upstream side). More specifically, as one example, the exhaust part 1 is an exhaust pipe that is provided in a section in the exhaust flow path 5 where there is a concern about adhesion of foreign matter, or in a section where it is difficult to provide a double pipe due to its complex shape.

[0013] Of course, the exhaust part 1 is not limited to this, and is disposed in various sections in the exhaust flow path 5. Specifically, for example, the exhaust part 1 may be provided in a section downstream of the muffler 4 in the exhaust flow direction (hereinafter simply referred to as the downstream side). Furthermore, the exhaust part 1 may be configured as, for example, a catalytic converter or a silencer, or may be provided adjacent to the downstream side of the engine.

[0014] The exhaust part 1 includes a pipe 2 and an insulator 3 (see FIGS. 2 to 5). [2. Pipe] The pipe 2 is a flow path forming member that forms the exhaust flow path 5, and is generally cylindrical with one curved shape (see Figs. 2 to 5). Hereinafter, an imaginary line passing through the approximate center of a cross section perpendicular to the extension direction of the pipe 2 will be referred to as an axis A. Of course, the pipe 2 may extend generally straight, or may be curved at two or more points. The pipe 2 includes a flange portion 21 and a bracket 22.

[0015] The flange portion 21 is a flange-shaped portion provided at the end of the pipe 2, and is used for joining to another pipe. The bracket 22 is a plate-like member joined to the outer circumferential surface 20 of the pipe 2, and is used to join the insulator 3 to the pipe 2. In the present embodiment, as an example, two brackets 22 are provided on the outer circumferential surface 20 so as to face each other across the axis A. As an example, the bracket 22 includes a base 22A, two side walls 22B, and two joints 22C.

[0016] The base portion 22A is, for example, a substantially rectangular flat plate portion that is disposed at a distance from the outer circumferential surface 20 of the pipe 2 and faces the outer circumferential surface 20. The insulator 3 is joined (for example, welded) to the base portion 22A.

[0017] The two side walls 22B are located at both ends of the base portion 22A in the circumferential direction about the axis A (hereinafter, simply referred to as the circumferential direction), and protrude toward the outer circumferential surface 20. The two joints 22C are provided at ends of the side walls 22B on the opposite side from the base portion 22A, and are joined to the outer circumferential surface 20 (by welding, for example).

[0018] [3. Insulator] The insulator 3 is a plate-like member provided to surround all or part of the outer circumferential surface 30 of the pipe 2, and functions as a heat shield (see Figs. 2 to 5). The insulator 3 is substantially cylindrical, and is disposed with a gap between it and the outer circumferential surface 30 of the pipe 2. The insulator 3 includes first and second portions 3A and 3B. The insulator 3 also includes a first joint portion 32, a second joint portion 33, a bulging portion 34, a covering member 35, and a retaining member 36 (a wire mesh, for example).

[0019] The first and second portions 3A, 3B have a substantially semicircular cross section (hereinafter simply referred to as a cross section) perpendicular to the axis A, and are arranged to sandwich the pipe 2 therebetween with both circumferential ends joined. Specifically, at least one first joint portion 32 is provided at each circumferential end of each of the first and second portions 3A, 3B. The first joint portions 32 of the first and second portions 3A, 3B are joined to each other by, for example, welding.

[0020] The second joint portion 33 is provided on each of the first and second parts 3A and 3B. The second joint portion 33 is a portion of the insulator 3 formed to protrude outward, and has a top portion that spreads out in a flat shape. The top portion is joined to the base portion 22A of the bracket 22 by, for example, welding.

[0021] The retaining member 36 is a cushioning material and is provided in regions near both ends of the inner circumferential surface 31 of the insulator 3. The retaining member 36 is disposed so as to surround the opening of the insulator 3 and abuts against the outer circumferential surface 20 of the pipe 2. This makes it possible to prevent foreign matter from entering the gap between the insulator 3 and the pipe 2 from the end of the insulator 3. Note that instead of the retaining member 36, a cushioning material such as glass wool may be provided.

[0022] [4. Bulging parts and covering parts] The bulging portion 34 is a portion of the insulator 3 formed to bulge outward, and its top portion 34A is, for example, a substantially rectangular shape spreading in a plane, and a through hole 34B is formed penetrating the top portion 34A (see FIGS. 2 to 5). In other words, the bulging portion 34 forms a depressed portion on the inner circumferential surface 31 of the insulator 3.

[0023] At least one bulge 34 is provided in each of the first and second parts 3A, 3B of the insulator 3. In the present embodiment, as an example, two bulges 34 are provided in each of the first and second parts 3A, 3B. Note that at least one bulge 34 may be provided in only one of the first and second parts 3A, 3B.

[0024] Moreover, each swelling portion 34 of the first portion 3A faces each swelling portion 34 of the second portion 3B across the axis A (see FIG. 5). Moreover, the swelling portions 34 and the through holes 34B are arranged such that, when the exhaust part 1 is mounted on a vehicle, the through holes 34B in the swelling portion 34 of the first portion 3A are positioned at the upper part of the exhaust part 1, and the through holes 34B in the swelling portion 34 of the second portion 3B are positioned at the lower part of the exhaust part 1.

[0025] For example, the bulging portions 34 and the through holes 34B may be provided only in positions that are located either in the upper portion or the lower portion when the exhaust part 1 is mounted on a vehicle. Of course, this is not limiting, and the positions of the bulging portions 34 and the through holes 34B in each of the first and second portions 3A, 3B can be determined as appropriate.

[0026] The through holes 34B of the bulging portion 34 are used to position the first or second portion 3A, 3B of the insulator 3 when the insulator 3 is attached to the pipe 2 in the manufacturing process of the exhaust part 1. Specifically, a positioning pin P is inserted into each through hole 34B, and the first or second portion 3A, 3B is positioned via an assembly jig including the positioning pin P. This makes it possible to suppress the first or second portion 3A, 3B from being displaced in the circumferential direction. As a result, welding of the first joint portion 32 in the first and second portions 3A, 3B and welding of the second joint portion 33 in the first and second portions 3A, 3B to the base portion 22A of the bracket 22 can be performed satisfactorily.

[0027] In this case, for example, the through hole 34B of the first portion 3A is located near the top, and the through hole 34B of the second portion 3B is located near the bottom. This makes it easy to insert the positioning pin P into the through hole 34B and to position the first and second portions 3A and 3B. It also makes it easy to weld the first joints 32 in the first and second portions 3A and 3B.

[0028] A covering member 35 is disposed on the inner peripheral surface 31 of the insulator 3 so as to cover the entire area of ​​the bulging portion 34 (in other words, the through hole 34B). The covering member 35 is located between the insulator 3 and the outer peripheral surface 20 of the pipe 2, and is a flat member that has cushioning properties and is permeable to liquids, and is made of a wire mesh, for example. Note that the covering member 35 may be made of, for example, glass wool, other than the wire mesh.

[0029] The cross section of the covering member 35 is, for example, arc-shaped, for example, about 60 to 80 degrees, and extends in the direction of the axis A. When the through hole 34B is viewed from the outside to the inside of the insulator 3, the central peripheral portion of the covering member 35 faces the through hole 34B.

[0030] A gap G is formed between the covering member 35 and the bulging portion 34 covered by the covering member 35. In other words, the covering member 35 is disposed at a distance from the through hole 34B.

[0031] Also, as one example, the covering member 35 abuts against the outer peripheral surface 20 of the pipe 2. This allows the insulator 3 to be suitably held. However, this is not limiting, and a gap may be formed between the covering member 35 and the outer peripheral surface 20 of the pipe 2 (see FIG. 6).

[0032] As an example, the covering member 35 is welded to the periphery of the bulge 34 on the inner circumferential surface 31 of the insulator 3. Of course, the covering member 35 may be joined to the inner circumferential surface 31 by a method other than welding. The covering member 35 may also be joined to the outer circumferential surface 20 of the pipe 2 by, for example, welding.

[0033] [5. Effects] (1) According to the above embodiment, the through hole 34B of the bulge 34 in the insulator 3 is used to position the first or second portion 3A, 3B when attaching the insulator 3 to the pipe 2. In addition, the periphery of the bulge 34 and the through hole 34B on the inner circumferential surface 31 of the insulator 3 is covered with the covering member 35. This makes it possible to prevent foreign matter from entering the gap between the insulator 3 and the pipe 2 through the positioning through hole 34B.

[0034] In the above embodiment, positioning is performed by inserting the positioning pin P into the through hole 34B, and the position of the through hole 34B can be determined with high precision, improving the positioning precision. Also, the size of the through hole 34B can be made larger because the covering member 35 prevents foreign matter from entering. This allows a larger-sized positioning pin P to be used, enabling better positioning.

[0035] (2) Furthermore, the covering member 35 is disposed at a distance from the through hole 34B. This ensures that the length of the positioning pin P that can be inserted into the through hole 34B is sufficient, and the positioning pin P can be smoothly inserted into the through hole 34B. As a result, welding of the first and second parts 3A, 3B of the insulator 3 and welding of the insulator 3 to the base 22A of the bracket 22 of the pipe 2 can be performed with higher accuracy.

[0036] In particular, in the above embodiment, the bulge 34 ensures a distance between the covering member 35 and the through hole 34B. Therefore, a distance can be provided between the covering member 35 and the through hole 34B without imposing any restrictions on the position of the insulator 3 relative to the pipe 2.

[0037] (3) Moreover, the covering member 35 is a member that has cushioning properties and is permeable to liquid, and is configured as a wire mesh, for example. Therefore, liquid such as condensed water that accumulates between the insulator 3 and the pipe 2 can be effectively discharged to the outside of the insulator 3 through the through-hole 34B. Moreover, the covering member 35 can effectively hold the insulator 3, and when the exhaust part 1 is mounted on a vehicle, the covering member 35 can effectively absorb vibrations. Furthermore, by providing the covering member 35, interference between the insulator 3 and the pipe 2 can be suppressed when the insulator 3 is attached to the pipe 2, and damage to the insulator 3 and the pipe 2 can be suppressed.

[0038] (4) Furthermore, since the bracket 22 is provided on the outer peripheral surface 20 of the pipe 2, the insulator 3 can be attached to the pipe 2 favorably via the bracket 22.

[0039] (5) Furthermore, the through hole 34B is disposed so as to be located at the upper and / or lower part of the exhaust part 1 when the exhaust part 1 is mounted on a vehicle. Therefore, when the through hole 34B is located at the upper part, the covering member 35 can suitably prevent foreign matter from entering between the insulator 3 and the pipe 2 via the through hole 34B. When the through hole 34B is located at the lower part, liquid such as condensed water accumulated between the insulator 3 and the pipe 2 can be suitably discharged to the outside of the insulator 3 via the through hole 34B.

[0040] 6. Other embodiments (1) In the above embodiment, the through hole 34B is provided in the apex 34A of the bulging portion 34 of the insulator 3. However, the through hole 34B may be formed in the insulator 3 without providing the bulging portion 34. Then, the area around the through hole 34B on the inner circumferential surface 31 of the insulator 3 may be covered with the covering member 35 similar to that in the above embodiment. In other words, there may not be a distance between the covering member 35 and the through hole 34B.

[0041] Even with this configuration, if the first and second portions 3A, 3B are thick or if the covering member 35 is deformable by pressure via the positioning pin P, the length of the positioning pin P that can be inserted into the through hole 34B can be sufficiently ensured. Therefore, the positioning of the first and second portions 3A, 3B can be performed using the positioning pin P.

[0042] Furthermore, in this case, a recess may be provided in covering member 35, and the area around through hole 34B on inner circumferential surface 31 of insulator 3 may be covered by covering member 35 with the recess facing through hole 34B. In this way, a space for inserting positioning pin P is formed around through hole 34B, and the length of positioning pin P that can be inserted into through hole 34B can be sufficiently secured. Therefore, the positioning of first and second portions 3A, 3B can be performed using positioning pin P.

[0043] (2) In the above embodiment, the shape of the insulator 3 is substantially cylindrical, but is not limited thereto, and the shape of the insulator 3 may be appropriately determined. Specifically, for example, the insulator 3 may be configured to cover the outer circumferential surface 20 of the pipe 2 over a predetermined section in the circumferential direction, and as one example, the insulator 3 may be a member having a substantially semicircular cross section (see FIG. 7). The insulator 3 may cover the lower side of the outer circumferential surface 20 of the pipe 2, and the second joint portions 33 located at both ends of the cross section of the insulator 3 may be welded to the outer circumferential surface 20 of the pipe 2. In addition, the bulge portion 34 and the through hole 34B may be arranged so that the through hole 34B is located at the lower part when the exhaust part 1 is mounted on a vehicle.

[0044] (3) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by 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.

[0045] [7. Technical Concepts Disclosed in This Specification] [Item 1] An exhaust component mounted on a vehicle and configured to allow exhaust gas to flow downward, A flow path forming member that forms an exhaust flow path; an insulator which is a plate-shaped member covering an outer circumferential surface of the flow passage forming member; a through hole which penetrates the insulator and is used to position the insulator when attaching the insulator to the flow passage forming member; a covering member provided between the flow passage forming member and the insulator, The covering member is a member that has cushioning properties and is permeable to liquid, and is disposed so as to cover the through hole. Exhaust parts.

[0046] [Item 2] Item 1, an exhaust part according to the present invention, The covering member is disposed at a distance from the through hole. Exhaust parts.

[0047] [Item 3] The exhaust part according to item 1 or 2, The covering member is a wire mesh and is joined to the inner peripheral surface of the insulator. Exhaust parts.

[0048] [Item 4] An exhaust part according to any one of items 1 to 3, A bracket is provided on an outer circumferential surface of the flow passage forming member, The bracket is joined to the insulator. Exhaust parts.

[0049] [Item 5] An exhaust part according to any one of items 1 to 4, The through hole is arranged to be located at least one of an upper portion and a lower portion when the exhaust part is mounted on the vehicle. Exhaust parts. [Explanation of symbols]

[0050] A...axis, P...positioning pin, G...gap, 1...exhaust part, 2...pipe, 22...bracket, 22A...base, 3...insulator, 3A...first part, 3B...second part, 32...first joint, 33...second joint, 34...bulge, 34A...top, 34B...through hole, 35...covering member, 5...exhaust gas flow path.

Claims

1. An exhaust component mounted on a vehicle and configured to allow exhaust gas to flow downward, A flow path forming member that forms an exhaust flow path; an insulator which is a plate-shaped member covering an outer circumferential surface of the flow passage forming member; a through hole which penetrates the insulator and is used to position the insulator when attaching the insulator to the flow passage forming member; a covering member provided between the flow passage forming member and the insulator, The covering member is a member that has cushioning properties and is permeable to liquid, and is disposed so as to cover the through hole. Exhaust parts.

2. 2. The exhaust component of claim 1, The covering member is disposed at a distance from the through hole. Exhaust parts.

3. 3. An exhaust component according to claim 1 or 2, The covering member is a wire mesh and is joined to the inner peripheral surface of the insulator. Exhaust parts.

4. 3. An exhaust component according to claim 1 or 2, A bracket is provided on an outer circumferential surface of the flow passage forming member, The bracket is joined to the insulator. Exhaust parts.

5. 3. An exhaust component according to claim 1 or 2, The through hole is arranged to be located at least one of an upper portion and a lower portion when the exhaust part is mounted on the vehicle. Exhaust parts.

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