JP2022135395A - clamp cover - Google Patents

Abstract

To provide a clamp cover that can be readily fitted to a clamp.SOLUTION: A clamp cover includes: a cover body covering the outside of a clamp; and an engagement part disposed so as to extend toward the clamp from a pair of side wall parts that face each other while interposing the clamp in the cover body, and elastically engaging the clamp.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to clamp covers.

2. Description of the Related Art Conventionally, clamps for fixing objects to be clamped have been put into practical use. For example, a purification device such as a DPF (Diesel Particulate Filter) is fixed to the exhaust pipe with a clamp. Here, the clamp is required to fix the object to be clamped in a small space.

As a technique for fixing a clamping target in a small space, for example, Patent Document 1 discloses a clamp connection structure that improves durability. This clamp connection structure uses a V-clamp having a C-shaped or V-shaped outer shape, so that the object to be clamped can be fixed in a small space.

JP 2010-180884 A

However, the clamps of the clamp connection structure of Patent Document 1 are arranged so as to be exposed to the outside. For this reason, for example, when the DPF is burned and regenerated, the heat may be released to the outside through the clamp, and the combustion temperature of the DPF may decrease. There is a risk that the temperature will drop and the exhaust gas purification performance will drop. Therefore, it is conceivable to attach a clamp cover formed to cover the outside of the clamp to the clamp. However, if the clamp cover is attached by a method that requires fixing work such as fasteners and welding, the fixing work may require a lot of labor.

SUMMARY OF THE DISCLOSURE An object of the present disclosure is to provide a clamp cover that can be easily attached to a clamp.

The clamp cover according to the present disclosure includes a cover body that covers the outside of the clamp, and a pair of side wall portions that are arranged to extend toward the clamp from a pair of side wall portions that face each other across the clamp in the cover body, and are engaged elastically with the clamp. and a joint.

The present disclosure allows easy attachment to the clamp.

FIG. 2 is a diagram showing a configuration of an exhaust pipe provided with a clamp cover according to Embodiment 1 of the present disclosure; FIG. FIG. 4 is a cross-sectional view showing the configuration of a clamp structure; It is a figure which shows a mode that a clamp cover is manufactured. FIG. 5 is a cross-sectional view showing how the clamp is fixed to the exhaust pipe body; FIG. 4 is a cross-sectional view showing how the clamp cover is attached to the clamp; FIG. 8 is a cross-sectional view showing the configuration of a clamp cover according to Embodiment 2; FIG. 10 is a diagram showing how a clamp cover is manufactured in Embodiment 4; FIG. 11 is a cross-sectional view showing how an engaging portion is opened in Embodiment 4; FIG. 11 is a cross-sectional view showing the configuration of a clamp cover according to Embodiment 5; FIG. 12 is a diagram showing how a clamp cover is manufactured in Embodiment 5;

Hereinafter, embodiments according to the present disclosure will be described based on the accompanying drawings.

(Embodiment 1)
FIG. 1 shows the configuration of an exhaust pipe provided with a clamp cover according to Embodiment 1 of the present disclosure. The exhaust pipe has an exhaust pipe body 1 and a clamp structure 2 .

The exhaust pipe main body 1 is arranged in a vehicle, and exhausts exhaust gas discharged from an exhaust port of an internal combustion engine (not shown) to the outside. A purification device such as a filter 3 is arranged inside the exhaust pipe main body 1 . Examples of vehicles include commercial vehicles such as trucks. Examples of internal combustion engines include diesel engines.

The filter 3 is arranged downstream of an oxidation catalyst (not shown) in the exhaust pipe body 1 and traps particulate matter such as soot components contained in the exhaust gas. The filter 3 can be of a so-called wall-flow type, in which cells made of porous ceramics such as cordierite and silicon carbide are arranged so that inlets and outlets are alternately closed. Examples of the filter 3 include a DPF (Diesel particulate filter).

The oxidation catalyst oxidizes fuel injected from an internal combustion engine or the like and heats the exhaust gas to a high temperature with the heat of reaction. Examples thereof include a DOC (Diesel Oxidation Catalyst).

The clamp structure 2 has a clamp 4 and a clamp cover 5 .

The clamp 4 has a holding portion 6 and a fixing portion 7 .
The holding portion 6 is arranged to surround the outer circumference of the exhaust pipe body 1 and holds the exhaust pipe body 1 and the filter 3 . Moreover, the holding part 6 has a plurality of movable parts arranged at intervals in the circumferential direction D1, and the movable parts are formed so that the diameter can be changed. For example, the clamp 4 can be arranged on the exhaust pipe main body 1 by enlarging the diameter of the holding portion 6 .

The fixing portion 7 is connected to a plate-like portion (not shown) so as to tighten the holding portion 6 toward the exhaust pipe body 1 via the plate-like portion. The diameter of the holding portion 6 is reduced according to this tightening. The fixing portion 7 fixes the posture of the holding portion 6 in a state where the holding portion 6 is tightened to the exhaust pipe main body 1 .

The clamp cover 5 has eight cover bodies 8 that cover the outside of the clamp 4 .
The cover main bodies 8 are arranged along the holding portion 6 in the circumferential direction D1. That is, the cover body 8 is separated from each other at one end 8a and the other end 8b. Here, each of the eight cover bodies 8 has an engaging portion 9 formed at the end portion 8a and an engaging portion 10 formed at the end portion 8b. The engaging portions 9 and 10 engage the clamp 4 to support the cover body 8 with respect to the clamp 4 .

Next, the configuration of the clamp structure 2 will be described in detail.

As shown in FIG. 2, the clamp 4 further has a plate-like portion 11 arranged outside the holding portion 6 in the radial direction D2. Here, the clamp 4 is arranged so as to hold the catalyst case 12 , the chamber 13 and the filter 3 in the exhaust pipe body 1 .

Here, the catalyst case 12 accommodates an oxidation catalyst, has a cylindrical shape, and is arranged so as to extend upstream of the filter 3 in the flow direction of the exhaust gas. A rear end portion of the catalyst case 12 is curved so as to protrude outward. The chamber 13 has a cylindrical shape and is arranged to extend downstream of the filter 3 in the exhaust gas flow direction. The front end of the chamber 13 is curved so as to protrude outward. The catalyst case 12 and the chamber 13 are arranged so as to sandwich the filter 3 therebetween.

A convex portion 3 a is arranged on the outer peripheral portion of the filter 3 . The convex portion 3a is arranged so as to be sandwiched between the rear end portion of the catalyst case 12 and the front end portion of the chamber 13 via the gasket 14 in the extending direction D3 of the exhaust pipe body 1 .

The holding portion 6 of the clamp 4 is formed to have a V-shaped cross section, and holds the rear end portion of the catalyst case 12, the front end portion of the chamber 13, the convex portion 3a, and the gasket 14 inside. are placed in

The plate-like portion 11 is arranged outside the holding portion 6 in the radial direction D2. The plate-like portion 11 is arranged so as to surround the holding portion 6 in the circumferential direction D<b>1 and is fixed to the outer surface of the holding portion 6 . The plate-like portion 11 is connected to the fixing portion 7 and presses the holding portion 6 inward in the radial direction D2 according to the tightening force of the fixing portion 7 . As a result, the diameter of the holding portion 6 is reduced, and the rear end portion of the catalyst case 12 , the front end portion of the chamber 13 and the convex portion 3 a of the filter 3 are held by the holding portion 6 .
Incidentally, the catalyst case 12, the chamber 13 and the filter 3 constitute objects to be clamped in the present disclosure.

The plate-like portion 11 is formed in a flat plate shape extending in the extending direction D3 of the exhaust pipe main body 1, and its edge portions 11a and 11b extend from the holding portion 6 toward the pair of side wall portions 15a and 15b of the cover main body 8. arranged to protrude. On the other hand, both edge portions of the holding portion 6 are formed so as to expand toward the side wall portions 15a and 15b with respect to the plate-like portion 11 side. Therefore, a gap G is formed between the edge portions 11 a and 11 b of the plate-like portion 11 and both edge portions of the holding portion 6 .

A cover body 8 of the clamp cover 5 has a pair of side walls 15 a and 15 b and an outer wall 16 . The side wall portions 15a and 15b have a flat plate shape and are arranged to face each other with the clamp 4 interposed therebetween in the extending direction D3. The outer wall portion 16 has a flat plate shape and is arranged so as to connect the side wall portion 15a and the side wall portion 15b to each other. That is, the side walls 15a and 15b and the outer wall 16 are integrally formed.

The engaging portion 9 formed at the end portion 8a of the cover body 8 has a pair of engaging portions 9a and 9b. The engaging portions 9a and 9b are arranged to extend from the side wall portions 15a and 15b toward the gap G of the clamp 4, respectively, and are formed to elastically engage the clamp 4. As shown in FIG. Specifically, the engaging portions 9a and 9b are formed integrally with the side walls 15a and 15b, and are formed by bending the edges of the side walls 15a and 15b toward the clamp 4 side. At this time, the engaging portions 9a and 9b are formed so as to extend from the edge portions of the side wall portions 15a and 15b toward the gap G, and the tip portions thereof abut against the plate-like portion 11 in the radial direction D2. . Thereby, the engaging portions 9 a and 9 b are elastically engaged with the plate-like portion 11 .

Note that the engaging portion 10 formed at the end portion 8b of the cover body 8 has the same configuration as the engaging portion 9, so the description thereof will be omitted.

A heat retaining portion 17 is arranged inside the cover main body 8 . The heat retaining portion 17 suppresses heat radiation from the clamp 4 to the outside, and is arranged so as to abut on the clamp 4 . That is, the heat retaining part 17 is arranged so as to fill the space between the cover main body 8 and the clamp 4 . The heat retaining portion 17 can be made of a heat retaining material such as glass wool, for example.

Next, a method for manufacturing the clamp cover 5 will be described.

First, a cover body 8 having a C-shaped cross section is formed by bending a plate member or the like. At this time, as shown in FIG. 3, the cover main body 8 is formed so as to be curved in the circumferential direction D1 according to the outer circumference of the clamp 4. As shown in FIG.

Extension portions 110 and 111 extending inward in the radial direction D2 from the side wall portion 15a are formed at the end portions 8a and 8b of the cover main body 8, respectively. Further, slits 112 and 113 are formed in the side walls 15a and 15b to extend outward in the radial direction D2 from the base ends of the extensions 110 and 111, respectively.

Subsequently, the extensions 110 and 111 are bent inwardly of the cover body 8 from the base ends 114 located at the roots of the slits 112 and 113 to form the engaging portions 9a and 9b.

By integrally forming the extensions 110 and 111 with the side walls 15a and 15b in this manner, the engagement portions 9a and 9b can be easily formed by simply bending the extensions 110 and 111. FIG.

By fitting the heat retaining portion 17 inside the cover main body 8, the clamp cover 5 can be manufactured. Note that the heat retaining portion 17 may be arranged inside the cover main body 8 after forming the cover main body 8 and before forming the engaging portions 9a and 9b.

Next, the operation of this embodiment will be described.

First, as shown in FIG. 4, the clamp 4 is fixed to the exhaust pipe body 1 to hold the catalyst case 12, the chamber 13 and the filter 3. As shown in FIG. At this time, the clamp 4 is a so-called V-clamp that holds the object to be clamped by reducing the diameter of the holding portion 6 according to the clamping of the plate-like portion 11 . Therefore, the clamp 4 can be formed lower in the radial direction D2 than, for example, a clamp provided with a flange portion and fastened with a bolt or the like, and the clamp 4 can be fixed to the exhaust pipe body 1 in a narrow space. can be done.

Subsequently, as shown in FIG. 5 , the clamp cover 5 is moved from the outside of the clamp 4 toward the inside in the radial direction D<b>2 to accommodate the clamp 4 in the heat retaining portion 17 . Then, the end 8 a of the cover body 8 is pressed toward the clamp 4 .

Thereby, as shown in FIG. 2, the engaging portions 9a and 9b can pass through the plate-like portion 11 of the clamp 4 and enter into the gap G to be elastically engaged with the plate-like portion 11. As shown in FIG. At this time, if the clamp cover is fixed to the clamp 4 by a method that requires a new fixing work such as fixtures and welding, the fixing work may require a lot of labor.

Therefore, in the present disclosure, engaging portions 9 a and 9 b are arranged on side wall portions 15 a and 15 b of cover body 8 and are formed so as to elastically engage clamp 4 . As a result, the engaging portions 9a and 9b can be engaged with the clamp 4 in the process of attaching the clamp cover 5 to the clamp 4, and the clamp cover 5 can be easily fixed to the clamp 4. FIG.

A heat retaining part 17 is arranged so as to fill the space between the cover main body 8 and the clamp 4 . The heat retaining portion 17 is made of a material having elasticity, and supports the clamp 4 so as to push the cover body 8 outward. As a result, the engaging portions 9 a and 9 b are pressed against the plate-like portion 11 , and the engaging portions 9 a and 9 b can be firmly engaged with the plate-like portion 11 .

In addition, since the engaging portions 9a and 9b engage the clamp 4 so as to sandwich it in the extending direction D3, the distance between the cover main body 8 and the clamp 4 can be kept constant in the extending direction D3. . As a result, the heat retaining portion 17 can be suppressed from being crushed between the cover main body 8 and the clamp 4 and deteriorated, and the heat retaining function can be maintained.

Similarly, the engaging portion 10 is elastically engaged with the plate portion 11 by pressing the end portion 8b of the cover body 8 toward the clamp 4 from the outside in the radial direction D2.

Thus, the clamp cover 5 can be easily attached to the clamp 4 by elastically engaging the engaging portions 9 and 10 with the clamp 4 .

At this time, the engaging portions 9 and 10 are formed at the ends 8a and 8b of the cover body 8, respectively. The ends 8a and 8b of the cover body 8 are starting points when the clamp cover 5 is removed from the clamp 4. By fixing the ends 8a and 8b with the engaging portions 9 and 10, the number of fixing points is reduced. detachment of the clamp cover 5 can be reliably suppressed.

In this manner, eight clamp covers 5 are attached along the clamp 4 as shown in FIG. In general, various devices are arranged around the exhaust pipe main body 1, and there is a possibility that the space for attaching the clamp cover 5 is narrow. Therefore, by forming the clamp cover 5 by separating it into eight pieces, each clamp cover 5 can be freely moved and positioned with respect to the clamp 4 even when the installation space is narrow. It can be smoothly attached to the clamp 4.

At this time, since the engaging portions 9 and 10 are formed on the eight clamp covers 5 respectively, it is possible to prevent the respective clamp covers 5 from coming off.

It should be noted that the clamp cover 5 is not limited to being divided into eight pieces, and may be divided into six pieces, for example. At this time, the smaller the number of divisions of the clamp cover 5, the longer the cover body 8 in the circumferential direction D1. For example, when the clamp cover 5 is divided into six parts, in addition to the engaging parts 9 and 10, a new engaging part can be formed near the central part of the cover main body 8 in the circumferential direction D1. Thereby, the clamp cover 5 can be securely fixed.

The vehicle is driven with the clamp cover 5 attached to the clamp 4 in this manner. At this time, since the clamp cover 5 is arranged to cover the outside of the clamp 4 , it is possible to suppress the heat inside the exhaust pipe body 1 from being released to the outside through the clamp 4 .

For example, when a predetermined amount of particulate matter is trapped in the filter 3, an oxidation catalyst (not shown) is oxidized, and the particulate matter trapped in the filter 3 is removed by the exhaust gas heated to a high temperature by the reaction heat. Remove by burning. At this time, if the heat in the exhaust pipe main body 1 is released to the outside through the clamp 4, the temperature of the exhaust gas may decrease, and the amount of combustion of the particulate matter captured by the filter 3 may decrease. . In addition, the temperature of the gas flowing into the catalyst arranged downstream is lowered, and there is a possibility that the exhaust gas purification performance is lowered.
Therefore, in the present disclosure, the clamp cover 5 is arranged to cover the outside of the clamp 4, thereby suppressing heat radiation from the clamp 4 and burning the particulate matter captured by the filter 3 at a predetermined temperature. can do.

In addition, since the heat retaining portion 17 is arranged inside the cover body 8, heat radiation from the clamp 4 can be reliably suppressed.

In this manner, the regeneration process for the filter 3 is repeatedly performed. Here, on the filter 3, not only combustible substances that are burned in the regeneration process but also non-combustible substances such as ash are accumulated. When a predetermined amount of incombustible material is deposited on the filter 3, the filter 3 is removed from the exhaust pipe main body 1 and cleaned.

At this time, the clamp 4 needs to be removed from the exhaust pipe body 1 in order to remove the filter 3 from the exhaust pipe body 1, and the clamp cover 5 is removed from the clamp 4 prior to this. Here, if the clamp cover 5 is firmly fixed to the clamp 4 by welding or the like, the clamp cover 5 will be broken every time the clamp 4 is removed, which may require a lot of labor for the removal work. .

Therefore, by elastically engaging the engaging portions 9a and 9 with the clamp 4 as shown in FIG. 9b can be disengaged and the clamp cover 5 can be easily removed from the clamp 4. Further, since the clamp cover 5 is not broken when removed from the clamp 4, it can be reattached to the clamp 4 after maintenance of the filter 3 is completed.

According to this embodiment, the engaging portions 9a and 9b are arranged to extend from the pair of side wall portions 15a and 15b toward the clamp 4 and elastically engage the clamp 4, so that the clamp cover 5 is It can be easily attached to the clamp 4 .

(Embodiment 2)
A second embodiment of the present disclosure will be described below. Here, differences from the first embodiment will be mainly described, and common reference numerals will be used for common points with the first embodiment, and detailed description thereof will be omitted.

In Embodiment 1 above, the engaging portions 9a and 9b are formed so as to elastically engage only with the plate-like portion 11 of the clamp 4. It is not limited to this.

For example, as shown in FIG. 6, engaging portions 21a and 21b can be arranged in place of the engaging portions 9a and 9b of the first embodiment.

The engaging portions 21a and 21b are arranged to extend from the side wall portions 15a and 15b toward the gap G of the clamp 4, respectively, and are formed to elastically engage with the plate-like portion 11 and the holding portion 6. . Specifically, the engaging portions 21a and 21b are curved so as to spread widely between the plate-like portion 11 and the holding portion 6, and the vicinity of the tip portion engages with the plate-like portion 11 from the inside in the radial direction D2. The vicinity of the base end portion engages with the holding portion 6 from the outside in the radial direction D2.

Thus, the clamp cover 5 can be easily fixed to the clamp 4 by elastically engaging the clamp 4 with the engaging portions 21a and 21b.
At this time, since the engaging portions 21a and 21b are elastically engaged with the plate-like portion 11 and the holding portion 6, the cover main body 8 can be supported on both sides in the radial direction D2 with respect to the clamp 4. FIG. Therefore, the engaging portions 21a and 21b can firmly support the cover main body 8 only by their own engaging force. can be fixed to

According to the present embodiment, the engaging portions 21a and 21b are formed so as to elastically engage with the plate-like portion 11 and the holding portion 6, so that the clamp cover 5 can be firmly fixed to the clamp 4. can be done.

(Embodiment 3)
A third embodiment of the present disclosure will be described below. Here, the points of difference from the first and second embodiments will be mainly described, and the points in common with the first and second embodiments will be described in detail using common reference numerals. omitted.

In Embodiments 1 and 2 described above, the eight clamp covers 5 are formed separately from each other.

For example, the cover bodies 8 of the eight clamp covers 5 can be formed so that they are separated from each other at the side walls 15 a and 15 b and connected to each other at the outer wall 16 . That is, the outer wall portion 16 is formed so as to extend continuously in the circumferential direction D1 over the eight cover main bodies 8 .

In this way, since the eight cover bodies 8 are connected to each other by the outer wall portion 16, even if the engaging portion of one of the eight clamp covers 5 is damaged, the other clamp covers 5 may be damaged. The engagement force can keep the broken clamp cover 5 fixed and prevent the clamp cover 5 from coming off.

Moreover, since the eight clamp covers 5 are separated from each other by the side walls 15a and 15b, they can be smoothly attached to the clamp 4 even when the attachment space is narrow, as in the first and second embodiments.

According to the present embodiment, the eight cover bodies 8 are separated from each other by the side walls 15a and 15b and are connected to each other by the outer wall 16, so that the clamp cover 5 can be clamped while preventing the clamp cover 5 from coming off. The cover 5 can be smoothly attached to the clamp 4.

(Embodiment 4)
A fourth embodiment of the present disclosure will be described below. Here, the description will focus on the differences from the first to third embodiments described above, and the common points with the first to third embodiments will be described in detail using common reference numerals. omitted.

In Embodiments 1 to 3 described above, the base end portion 114 of the engaging portion is formed at the root portion of the slits 112 and 113, but it may be arranged at the side wall portions 15a and 15b, and is limited to this. not a thing

For example, as shown in FIG. 7, slits 210 and 211 can be formed instead of the slits 112 and 113 formed in the side walls 15a and 15b in the first embodiment.

Slits 210 and 211 are formed to extend toward outer wall portion 16 from base end portion 114 where extension portions 110 and 111 are bent. Therefore, when the engaging portions 9 and 10 are formed by bending the extension portions 110 and 111 from the base end portion 114 toward the inner side of the cover main body 8, the engaging portions 9 and 10 extend from the base end portion 114 to the outer wall portion 16 side. Slits 210 and 211 are formed extending to the . Thereby, the cover main body 8 has slits 210 and 211 extending from the base ends 114 of the engaging portions 9 and 10 .

With such a configuration, as shown in FIG. 8, the engaging portions 9a and 9b can be easily moved to open from the root portion of the slit 210 in the extending direction D3 in response to pressure in the radial direction D2. Accordingly, when the clamp cover 5 is removed from the clamp 4, for example, the engaging portions 9a and 9b collide with the plate-like portion 11 and are easily pushed apart, so that the clamp cover 5 can be removed smoothly.
Since the engaging portion 10 has the same configuration as the engaging portion 9, the description thereof is omitted.

According to the present embodiment, since the cover body 8 has the slits 210 and 211 extending from the base ends 114 of the engaging portions 9 and 10, the engaging portions 9 and 10 are opened in response to pressure in the radial direction D2. can be easily moved.

(Embodiment 5)
A fifth embodiment of the present disclosure will be described below. Here, the description will focus on the differences from the above-described Embodiments 1 to 4, and the common points with the above-described Embodiments 1 to 4 will be described in detail using common reference numerals. omitted.

In Embodiments 1 to 4 described above, the engaging portion is formed by bending the extension portions 110 and 111 extending inward in the radial direction D2 from the side wall portion 15a toward the inside of the cover main body 8. It is not limited to this as long as it can be formed so as to extend toward.

For example, as shown in FIG. 9, engaging portions 51a and 51b can be arranged in place of the engaging portions 9a and 9b of the first embodiment. The engaging portions 51a and 51b are formed by bending the side wall portions 15a and 15b themselves toward the inside of the cover body 8. As shown in FIG.

Specifically, as shown in FIG. 10, a slit 310 is formed in the side wall portion 15a. The slit 310 is formed to extend inward in the radial direction D2 from the outer wall portion 16 side. By bending the base end portion 312 located at the root portion of the slit 310 toward the inside of the cover body 8, the engaging portion 9a can be formed. Since the engaging portion 9b is formed on the side wall portion 15b in the same manner as the engaging portion 9a, a description thereof will be omitted.

In this way, the engaging portions 9a and 9b can be easily formed. Also, the engaging portion 10 can be formed by forming slits 311 in the side wall portions 15a and 15b and bending the base end portion 312 similarly to the engaging portions 9a and 9b.

According to the present embodiment, the engaging portions 51a and 51b are formed by bending the side wall portions 15a and 15b themselves toward the inside of the cover main body 8, so that they can be easily formed.

In Embodiments 1 to 5 above, the clamp cover 5 is provided to keep the clamp 4 warm. do not have.

Further, in the first to fifth embodiments described above, the clamp structure 2 is arranged on the vehicle, but the clamp structure is not limited to this as long as the clamp object can be held by the clamp 4 . For example, the clamping structure 2 can be placed on ships, industrial machines or factories with stationary internal combustion engines.

Further, in the first to fifth embodiments, the clamp structure 2 is arranged in the exhaust pipe, but it is not limited to the exhaust pipe as long as the clamp object can be held by the clamp 4 .

In addition, the above-described embodiments are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be construed to be limited by these. be. Thus, the invention may be embodied in various forms without departing from its spirit or essential characteristics. For example, the disclosure of the shape, number, etc. of each part described in the above embodiment is merely an example, and can be implemented with appropriate modifications.

A clamp cover according to the present disclosure can be used for a cover arranged to cover the outside of a clamp.

REFERENCE SIGNS LIST 1 exhaust pipe body 2 clamp structure 3 filter 3a convex portion 4 clamp 5 clamp cover 6 holding portion 7 fixing portion 8 cover body 8a, 8b ends 9, 10, 9a, 9b, 21a, 21b, 51a, 51b engagement Part 11 Plate-like part 12 Catalyst case 13 Chamber 14 Gasket 15a, 15b Side wall part 16 Outer wall part 17 Thermal insulation part 110, 111 Extension part 112, 113, 210, 211, 310, 311 Slit 114, 312 Base end part D1 Circumferential direction D2 Radial direction D3 Extension direction

Claims (7)

a cover body that covers the outside of the clamp;
and an engaging portion that is arranged to extend toward the clamp from a pair of side wall portions of the cover body that are opposed to each other across the clamp, and that engages elastically with the clamp. The clamp has a plate-like portion arranged to protrude toward the pair of side wall portions,
2. The clamp cover according to claim 1, wherein the engaging portion is formed to elastically engage with the plate-like portion. The clamp has a holding portion that is formed to surround the object to be clamped and is arranged inside the plate-like portion in the radial direction to hold the object to be clamped in response to pressure from the plate-like portion,
3. The clamp cover according to claim 2, wherein said engaging portion is formed to elastically engage with said plate-like portion and said holding portion. The cover body is composed of a plurality of cover bodies arranged along the clamp,
The clamp cover according to any one of claims 1 to 3, wherein the engaging portions are formed on the plurality of cover bodies. 5. The clamp cover according to claim 4, wherein the plurality of cover bodies are separated from each other by the pair of side wall portions and connected to each other by an outer wall portion connecting the pair of side wall portions. the cover body is formed to extend along the clamp;
The clamp cover according to any one of claims 1 to 5, wherein the engaging portions are formed at least at both ends of the cover body. The engaging portion is formed integrally with the pair of side wall portions,
The clamp cover according to any one of claims 1 to 6, wherein the cover body has a slit extending from the base end of the engaging portion.

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