JP2021116733A - Exhaust system component - Google Patents

Abstract

To provide an exhaust system component which can inhibit exhaust gas discharged from an exhaust pipe from blowing onto peripheral components and damaging the peripheral components with heat of the exhaust gas.SOLUTION: An exhaust system component forms at least part of an exhaust system of a vehicle internal combustion engine and includes an exhaust pipe 2 and a cover member 3. The exhaust pipe 2 forms an exhaust passage of the exhaust system. A hole 22 is formed on a side surface of the exhaust pipe 2. The cover member 3 is a member which covers the hole 22 while forming a gap with the exhaust pipe 2 and forms a communication passage for allowing an interior of the exhaust pipe 2 and the atmosphere to communicate through the hole 22 with the exhaust pipe 2. The exhaust system component is mounted on a vehicle so that an atmosphere side end part of the communication passage faces the lower side of the vehicle.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to exhaust system components that form at least a part of the exhaust system of an internal combustion engine for a vehicle.

In the exhaust system of an internal combustion engine for a vehicle, the internal combustion engine may not start if the exhaust flow path is blocked due to freezing of water generated by a catalytic reaction and accumulated in the exhaust pipe. Therefore, it is conceivable to form a communication passage that communicates the inside of the exhaust pipe with the atmosphere on the side surface of the exhaust pipe, exhaust the exhaust gas from the communication passage, and start the internal combustion engine.

Patent Document 1 discloses a configuration in which a communication passage for communicating the inside of the exhaust pipe and the atmosphere is provided on the side surface of the exhaust pipe. Specifically, the exhaust pipe of Patent Document 1 is connected in series with a first flow path member forming a part of the exhaust flow path and a first flow path member to form a part of the exhaust flow path. A second flow path member is provided. Then, at the connecting portion between the first flow path member and the second flow path member, a communication passage that communicates the inside and the outside of the exhaust pipe is formed.

International Publication No. 2014/141778

By the way, under the floor of the vehicle, various parts such as a battery, a fuel tank, and a brake hose (hereinafter referred to as peripheral parts) are arranged around the exhaust pipe. In the exhaust pipe described in Patent Document 1, high-temperature exhaust gas may be discharged to the outside through a continuous passage and may hit peripheral parts located above or to the side of the exhaust pipe. Then, the peripheral parts may be damaged by the heat of the exhaust gas.

In one aspect of the present disclosure, it is desirable to prevent the exhaust gas discharged from the exhaust pipe from hitting the peripheral parts and damaging the peripheral parts due to the heat of the exhaust gas.

One aspect of the present disclosure is an exhaust system component that constitutes at least a part of an exhaust system of an internal combustion engine for a vehicle, and includes an exhaust pipe and a covering member. The exhaust pipe forms an exhaust flow path of the exhaust system. A hole is formed on the side surface of the exhaust pipe. The covering member is a member for covering the hole with a gap between it and the exhaust pipe, and forming a communication passage between the exhaust pipe and the inside of the exhaust pipe and the atmosphere through the hole. Is. Exhaust system components are mounted on the vehicle so that the end of the communication passage on the atmospheric side faces the lower side of the vehicle.

According to such a configuration, the exhaust gas discharged from the internal combustion engine can be guided to the lower side of the vehicle. Therefore, the exhaust gas can be discharged while avoiding the peripheral parts located above or to the side of the exhaust system parts. Therefore, it is possible to prevent the exhaust gas discharged from the hole of the exhaust pipe from hitting the peripheral parts and damaging the peripheral parts due to the heat of the exhaust gas.

In one aspect of the present disclosure, when the exhaust system components are mounted on the vehicle, the holes may be located above the center of the exhaust pipe in a cross section perpendicular to the flow direction of the exhaust gas in the exhaust pipe.
According to such a configuration, it is possible to prevent water generated in the exhaust pipe from leaking from the hole as compared with the case where the hole is located below the center of the exhaust pipe in the cross section.

In one aspect of the present disclosure, the exhaust pipe may have a downwardly bent portion that bends downwardly of the vehicle when the vehicle is viewed from the side. The hole may be provided upstream of the downward bending portion in the flow direction of the exhaust gas. In addition, "bending" in this specification is a concept including "curving" which bends like a bow.

According to such a configuration, even if the lower bending portion is blocked due to freezing of condensed water or the like, the exhaust gas is discharged through the holes and the communication passages, so that the internal combustion engine can be easily started.

FIG. 1 is a view of the exhaust system parts according to the embodiment as viewed from the side of the vehicle. FIG. 2 is a sectional view taken along line II-II of FIG. 1 or FIG. FIG. 3 is an enlarged view of the portion surrounded by the broken line L1 in FIG. FIG. 4 is a diagram showing an exhaust system component (1) according to another embodiment. FIG. 5 is a diagram showing an exhaust system component (2) according to another embodiment. FIG. 6 is a diagram showing an exhaust system component (3) according to another embodiment. FIG. 7 is a diagram showing an exhaust system component (4) according to another embodiment. FIG. 8 is a diagram showing an exhaust system component (5) according to another embodiment. FIG. 9 is a diagram showing an exhaust system component (6) according to another embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. Constitution]
The exhaust system component 1 shown in FIG. 1 is a component that is arranged under the floor of the vehicle and constitutes at least a part of the exhaust system of the internal combustion engine for a vehicle. FIG. 1 is a view of the exhaust system component 1 viewed from the side of the vehicle in a state where the exhaust system component 1 is mounted on the vehicle. In FIG. 1, the upward direction of the paper surface corresponds to the upward direction of the vehicle, and the downward direction of the paper surface corresponds to the downward direction of the vehicle. Further, in FIG. 1, the left direction of the paper surface corresponds to the front of the vehicle, and the right direction of the paper surface corresponds to the rear of the vehicle. In each drawing, the upward direction of the vehicle is indicated by "UP", and the downward direction of the vehicle is indicated by the "DW" direction. Further, the front of the vehicle is indicated by "FR", and the rear of the vehicle is indicated by the "RR" direction.

Here, the vehicle upward direction and the vehicle downward direction are the upward direction and the downward direction with respect to the vehicle on which the exhaust system component 1 is mounted, respectively, and generally follow the directions perpendicular to the ground contact surface of the vehicle. Up and down. When the vehicle is located on a horizontal ground, the vehicle upward direction and the vehicle downward direction coincide with the vertical upward direction and the vertical downward direction, respectively. On the other hand, when the vehicle is located on a non-horizontal ground such as a slope, the vehicle upward direction and the vehicle downward direction are generally different from the vertical upward direction and the vertical downward direction, respectively. In the example shown in FIG. 1, the vehicle is located on a horizontal ground, and the vehicle upward direction and the vehicle downward direction coincide with the vertically upward direction and the vertical downward direction, respectively.

The exhaust system component 1 includes an exhaust pipe 2 and a covering member 3.
<Exhaust pipe>
The exhaust pipe 2 is a tubular member through which exhaust gas passes. The exhaust pipe 2 forms an exhaust flow path that serves as a flow path for the exhaust gas discharged from the internal combustion engine. The exhaust pipe 2 is provided on the vehicle so as to extend in the front-rear direction of the vehicle (the left-right direction on the paper surface in FIG. 1). FIG. 1 shows an S-shaped portion 21 which is a part of the exhaust pipe 2.

The S-shaped portion 21 is a portion extending in an S-shape, and has an upper bending portion 211 and a lower bending portion 212. The upper bent portion 211 is a portion bent upward in the vehicle. The downward bending portion 212 is a portion that is bent downward in the vehicle. The lower bending portion 212 is located downstream of the upper bending portion 211 in the exhaust gas flow direction D1. Hereinafter, the upstream and downstream of the exhaust gas flow direction D1 are simply referred to as upstream and downstream. When the upper bending portion 211 and the lower bending portion 212 are continuously formed, the exhaust flow passes through the inflection point between the line of the central axis of the upper bending portion 211 and the line of the central axis of the lower bending portion 212. The cross section of the road serves as a boundary between the upper bending portion 211 and the lower bending portion 212. When a linear exhaust flow path is provided on the upstream side or the downstream side of the upper bending portion 211, the bending portion formed by the upper bending portion 211 and the linear exhaust flow path is linear with the upper bending portion 211. It becomes the boundary with the exhaust flow path. On the other hand, when a linear exhaust flow path is provided on the upstream side or the downstream side of the downward bending portion 212, the bending portion formed by the lower bending portion 212 and the linear exhaust flow path is linear with the lower bending portion 211. It becomes the boundary with the exhaust flow path.

An internal combustion engine and a catalytic converter (not shown) are installed upstream of the S-shaped portion 21. The end of the exhaust pipe 2 located downstream of the S-shaped portion 21 is open to the atmosphere.
In the situation shown in FIG. 1, the exhaust pipe 2 is blocked due to the accumulation of condensed water W in the lower bent portion 212 and freezing of the condensed water W. This condensed water W is generated, for example, when the exhaust gas is purified by the catalytic converter.

Further, as shown in FIGS. 1 and 2, peripheral parts 4A to 4C are arranged on the vehicle upward side and the vehicle side side of the exhaust pipe 2. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and the left and right sides of the paper surface of FIG. 2 correspond to the side side of the vehicle. Peripheral parts 4A to 4C are parts located around the exhaust pipe 2, and are, for example, a battery, a fuel tank, a brake hose, and the like. Peripheral parts 4A-4C are schematically shown in the drawings. In FIG. 1, peripheral parts 4B and 4C are omitted. On the other hand, there are no peripheral parts on the vehicle downward side of the exhaust pipe 2.

As shown in FIG. 2, a hole 22 which is one small hole is formed on the side surface of the exhaust pipe 2 (in other words, the surface around the central axis of the exhaust pipe 2). The hole 22 communicates the inside and the outside of the exhaust pipe 2. The exhaust gas in the exhaust pipe 2 is discharged to the outside of the exhaust pipe 2 through the hole 22. The shape of the hole 22 is not particularly limited, and may be, for example, a circular shape or a rectangular shape.

In the present embodiment, as shown in FIG. 1, the hole 22 is located upstream of the portion of the exhaust pipe 2 where the condensed water W can collect and block.
That is, in the situation shown in FIG. 1, the condensed water W is accumulated in the lower bent portion 212, and the exhaust pipe 2 is blocked by the condensed water W. In the present embodiment, the portion of the exhaust pipe 2 where the condensed water W can be accumulated and blocked is the lowermost bent portion 212, specifically, the lowermost portion of the lower bent portion 212 and its vicinity. The hole 22 is located upstream of the boundary on the upstream side of the lower bent portion 212, and more preferably located at the upper bent portion 211.

It is desirable that the hole 22 is located on the upper side of the vehicle as much as possible in the exhaust pipe 2. In the present embodiment, the hole 22 is located at the uppermost portion of the upper bent portion 211. In other words, the uppermost portion of the upper bending portion 211 is a portion where the bending direction of the exhaust pipe 2 is switched from the vehicle upward side to the vehicle downward side, and the exhaust gas is discharged in a state where the vehicle is located on the horizontal ground. This is a place where the flow direction D1 becomes horizontal.

Further, in the present embodiment, the hole 22 is the center of the exhaust pipe 2 in a cross section perpendicular to the exhaust gas flow direction D1 in the exhaust pipe 2 (cross section shown in FIG. 2) in a state where the exhaust system component 1 is mounted on the vehicle. It is located above C. The upper side referred to here is the vehicle upward side. Specifically, the hole 22 is located at the uppermost part of the cross section, in other words, at the top of the circumference which is the cross-sectional shape of the exhaust pipe 2.
<Coating member>
The covering member 3 is a plate-shaped member that covers the hole 22. Specifically, the covering member 3 has a shape in which a substantially rectangular plate-shaped member is bent around the axis of the exhaust pipe 2. As shown in FIG. 3, the covering member 3 has a recessed portion 31 and a flange portion 32.

The recessed portion 31 is a recessed portion along the extending direction D2 of the covering member 3. The cross-sectional shape of the recessed portion 31 in the cross section perpendicular to the extending direction D2 is substantially U-shaped. The flange portion 32 is a portion extending outward along both edges of the recessed portion 31.

As shown in FIG. 2, the covering member 3 is bent so as to be concentric with the exhaust pipe 2. The covering member 3 has a semicircular arc shape (shape shown in FIG. 2) in a side view, and covers the exhaust pipe 2 by half around the axial direction of the exhaust pipe 2. Further, openings 33a and 33b are formed at both ends of the covering member 3 in the extending direction D2 (circumferential direction of the exhaust pipe 2 in FIG. 2), and both ends of the covering member 3 in the extending direction D2 are opened to the atmosphere. ing.

The covering member 3 covers the hole 22 of the exhaust pipe 2 with a gap between the covering member 3 and the exhaust pipe 2. Specifically, the covering member 3 is arranged so as to cover the hole 22 with the recessed portion 31, and in that state, the flange portion 32 of the covering member 3 is joined to the side surface of the exhaust pipe 2 by welding.

The covering member 3 forms a communication passage 34 with the exhaust pipe 2. The communication passage 34 communicates the inside of the exhaust pipe 2 with the atmosphere through the hole 22.
The communication passage 34 has an end portion (hereinafter, exhaust pipe side end portion) 34a opened to the inside of the exhaust pipe 2 and an end portion (hereinafter, atmosphere side end portion) 34b, 34c open to the atmosphere. .. The exhaust pipe side end portion 34a is a hole 22. The atmospheric side ends 34b and 34c are openings 33a and 33b at both ends of the covering member 3 in the extending direction D2, respectively. In the present embodiment, the exhaust system component 1 is mounted on the vehicle so that the atmospheric side ends 34b, 34c (that is, the exhaust gas discharge port) of the communication passage 34 face the lower side of the vehicle (that is, the downward side of the vehicle). Will be done.

Here, "the atmospheric side ends 34b, 34c face the lower side of the vehicle" means that the atmospheric side ends 34b, 34c face the vehicle downward side rather than the vehicle lateral direction. The vehicle lateral direction referred to here is a lateral direction with respect to the vehicle, and coincides with the horizontal direction when the vehicle is located on the horizontal ground. That is, "the atmosphere side ends 34b, 34c face the lower side of the vehicle" is only when the atmosphere side ends 34b, 34c face the vehicle downward direction (downward in FIG. 1 or FIG. 3). However, if it is on the lower side of the vehicle than the lateral direction of the vehicle, it is a concept that includes the case where the atmospheric side ends 34b and 34c face the direction deviated from the lower side of the vehicle to the front-rear and / or the left-right direction side of the vehicle. In the present embodiment, the atmospheric side ends 34b and 34c face downward in the vehicle.

In the present embodiment, the exhaust gas in the exhaust pipe 2 is guided to the lower side of the vehicle by the communication passage 34. Specifically, the exhaust gas discharged upward from the exhaust pipe 2 hits the covering member 3 and branches in both directions of the extending direction D2 of the covering member 3 as shown by the arrow D3 in FIG. 2, and two atmospheres. It is discharged toward the lower side of the vehicle through the side ends 34b and 34c.

[2. effect]
According to the embodiment described in detail above, the following effects are obtained.
(1) In the present embodiment, the exhaust system component 1 is mounted on the vehicle so that the atmospheric side ends 34b and 34c of the communication passage 34 face the lower side of the vehicle.

Therefore, the exhaust gas discharged from the internal combustion engine can be guided to the lower side of the vehicle. Therefore, the exhaust gas can be discharged while avoiding the peripheral parts 4A to 4C located above or to the side of the exhaust system part 1. Therefore, the exhaust gas discharged from the hole 22 of the exhaust pipe 2 hits the peripheral parts 4A to 4C, and it is possible to prevent the peripheral parts 4A to 4C from being damaged by the heat of the exhaust gas.

(2) Further, as in Patent Document 1, two flow path members are connected in series, and a continuous passage is formed so that exhaust gas is discharged only from the lower side of the exhaust pipe at the joint portion of the two flow path members. It is conceivable to do. However, in such a configuration, it is necessary to form a joint in the main trunk road of the exhaust pipe, and the strength of the exhaust pipe is lowered as compared with the case where the joint is not formed in the main trunk road. In this respect, according to the present embodiment, the exhaust gas can be guided to the lower side of the vehicle without forming a joint in the main trunk road of the exhaust pipe, so that the strength of the exhaust pipe 2 can be increased as compared with the above configuration. can.

(3) In the present embodiment, when the exhaust system component 1 is mounted on the vehicle, the hole 22 is located above the center C of the exhaust pipe 2 in a cross section perpendicular to the exhaust gas flow direction D1 in the exhaust pipe 2. do.

Therefore, it is possible to prevent water generated in the exhaust pipe 2 from leaking from the hole 22 as compared with the case where the hole 22 is located below the center C of the exhaust pipe 2 in the cross section.
In particular, dark water mixed with soot collects in the exhaust pipe 2. According to the configuration of the present embodiment, it is possible to prevent darkened water from dripping from the hole 22.

(4) In the present embodiment, the hole 22 is provided upstream of the downward bending portion 212 where the condensed water W in the exhaust pipe 2 can collect and block.
Therefore, even if the exhaust pipe 2 is blocked due to freezing of the condensed water W accumulated in the lower bending portion 212, the exhaust gas is discharged to the atmosphere through the hole 22 and the communication passage 34. Therefore, the internal combustion engine can be easily started.
(5) In the present embodiment, since the hole 22 is covered with the covering member 3, it is smaller and cheaper than the configuration in which the heat shield plates are provided on the peripheral parts 4A to 4C, and the above-mentioned effects can be obtained. Can be done.

[3. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be implemented in various modifications.

(1) In the above embodiment, the hole 22 is formed at the uppermost part in the cross section (cross section shown in FIG. 2) perpendicular to the flow direction D1 of the exhaust gas in the exhaust pipe 2, but the position where the hole is formed is this. Not limited.

For example, as shown in FIG. 4, in the exhaust pipe 5, the hole 51 may be formed at a position other than the uppermost portion in the cross section (that is, a position deviated from the uppermost portion). In this case, in the cross section, the hole 51 may be formed by shifting the hole 51 on the side away from the peripheral parts located above or on the side of the exhaust pipe.

That is, the portion of the covering member 3 near the hole 51 (for example, the portion surrounded by the broken line L2 in FIG. 4) is hit by the exhaust gas discharged from the exhaust pipe 5 through the hole 51 and tends to be heated by the heat of the exhaust gas. Then, the peripheral parts located near the portion of the covering member 3 near the hole 51 may be damaged by the heat of the heated covering member 3. At this point, it is conceivable that the hole 51 is formed by shifting the center line M parallel to the vehicle in the vertical direction of the exhaust pipe 5 to the side away from the peripheral parts (left side in FIG. 4). As a result, the portion of the covering member 3 in the vicinity of the hole 51, that is, the portion that tends to be heated by the heat of the exhaust gas can be kept away from the peripheral parts, and the peripheral parts can be prevented from being damaged by the heat of the heated covering member 3.

(2) In the above embodiment, the number of holes formed on the side surface of the exhaust pipe 2 is one, but the number of holes is not limited to this. For example, as shown in FIG. 5, a plurality of holes 61 and 62 may be formed on the side surface of the exhaust pipe. In the example shown in FIG. 5, two holes 61 and 62 are formed, but three or more holes may be formed.

By forming the plurality of holes in this way, even an internal combustion engine having a relatively large amount of exhaust gas can efficiently discharge the exhaust gas discharged from the internal combustion engine to the atmosphere through the plurality of holes.
(3) In the above embodiment, the two atmospheric side ends 34b and 34c of the communication passage 34 both face downward in the vehicle, but the direction of the atmospheric side end is not limited to this.

For example, as shown in FIG. 6, the atmospheric side ends 71a and 71b of the communication passage 71 may face in a direction deviated from the vehicle downward direction (downward direction in FIG. 6). Specifically, in the cross section perpendicular to the exhaust gas flow direction D1 in the exhaust pipe 2, the atmospheric side ends 71a and 71b may face diagonally downward. In this case as well, the atmospheric side ends 71a and 71b of the communication passage 71 face the lower side of the vehicle.

According to such a configuration, the exhaust gas discharged from the atmospheric side end of the continuous passage can be prevented from hitting the peripheral parts by changing the direction of the atmospheric side end of the continuous passage. Therefore, it is possible to prevent the peripheral parts from being damaged by the heat of the exhaust gas.

(4) In the above embodiment, the two atmospheric side ends 34b and 34c of the communication passage 34 are both open to the atmosphere, but as shown in FIG. 7, for example, of the two atmospheric side ends of the communication passage 34. Either one may be closed.

According to such a configuration, by closing the atmospheric side end located on the peripheral component side (the atmospheric side edge on the left side in the example shown in FIG. 7), the exhaust gas hits the peripheral component, and the heat of the exhaust gas causes the surrounding area. It is possible to prevent the member from being damaged.

(5) In the above embodiment, the openings 33a and 33b formed at both ends of the covering member 3 in the extending direction D2 form the atmospheric side ends 34b and 34c of the communication passage 34. However, the atmosphere side end of the passage is not limited to this.

For example, as shown in FIG. 8, both ends of the covering member 8 in the extending direction D2 are closed, and one is placed in a portion of the covering member 8 other than the both ends, specifically, a wall portion of the recessed portion 81 of the covering member 8. Or form a plurality of holes. Then, the hole may be the end of the communication passage 82 on the atmosphere side.

As a result, as shown by the arrow D3 in FIG. 8, the discharge direction of the exhaust gas discharged from the atmospheric side end of the communication passage 82 is changed. Therefore, it is possible to prevent the peripheral members from being hit by the exhaust gas and being damaged by the heat of the exhaust gas.

It should be noted that the ends of the covering member in the extending direction D2 on the side closer to the peripheral member may be closed. Moreover, only one of the both ends may be closed.
(6) In FIG. 4 and the like described above, the covering member 3 is arranged so as to be line-symmetric with respect to the center line M parallel to the vehicle vertical direction in the exhaust pipe 5, but the covering member 3 with respect to the exhaust pipe 5 The relative position is not limited to this. For example, as shown in FIG. 8 described above, the covering member 8 is arranged so as to be offset to either the right direction or the left direction of the vehicle with respect to the center line M parallel to the vehicle vertical direction in the exhaust pipe 5. You may.

(7) The method of forming the continuous passage is not limited to that of the above embodiment. For example, as shown in FIG. 9, the covering member 9 is formed in a tubular shape, and the exhaust pipe 2 and the covering member 9 partially realize a double pipe structure. The term "partial" as used herein means that only a part of the exhaust pipe 2 is covered with the covering member 9 along the exhaust gas flow direction D1 (the direction perpendicular to the paper surface of FIG. 9). Then, a hole 92 is formed in a portion of the covering member 9 located on the lower side of the vehicle. In this way, a communication passage 93 having the hole 92 as an end on the atmosphere side may be formed in the gap between the covering member 9 and the exhaust pipe 2.

(8) In the above embodiment, the covering member 3 covers the exhaust pipe 2 about half around the axis of the exhaust pipe 2, but the length of the covering member 3 around the axis of the exhaust pipe 2 is not limited to this. For example, the covering member may have an arc shape longer than a semi-circular arc, or may have an arc shape shorter than a semi-circular arc. In either case, the covering member may extend so as to cover the hole 22 of the exhaust pipe 2.

(9) In the above embodiment, the hole formed on the side surface of the exhaust pipe may be an elongated hole extending in a predetermined direction. In this case, for example, the elongated hole may extend around the axis of the exhaust pipe, or may extend in the exhaust gas flow direction D1 (direction perpendicular to the paper surface of FIG. 2).

When the elongated holes extend around the axis of the exhaust pipe, the elongated holes may be formed so that the entire elongated holes are located above the center C of the exhaust pipe 2. According to such a configuration, it is possible to prevent the water generated in the exhaust pipe 2 from leaking from the elongated hole.

(10) In the above embodiment, the hole 22 is formed in the upper bent portion 211 of the exhaust pipe 2, but the position of the hole is not limited to this. For example, the hole may be formed at a position other than the upper bent portion 211 in the exhaust pipe 2.

(11) A plurality of functions possessed by one component in the above embodiment may be realized by a plurality of components, or one function possessed by one component may be realized by a plurality of components. .. Further, a plurality of functions possessed by the plurality of components may be realized by one component, or one function realized by the plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. In addition, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other above embodiment.

1 ... Exhaust system parts, 2,5,6 ... Exhaust pipes, 3,8,9 ... Covering members, 4A-4C ... Peripheral parts,
22, 51, 61, 62 ... Holes, 34, 71, 82, 93 ... Continuous passages,
34b, 34c, 71a, 71b ... atmospheric side end, 212 ... downward bending.

Claims (3)

Exhaust system parts that form at least a part of the exhaust system of an internal combustion engine for vehicles.
An exhaust pipe forming an exhaust flow path of the exhaust system, the exhaust pipe having holes formed on the side surfaces, and the exhaust pipe.
A member for covering the hole with a gap between the exhaust pipe and forming a communication passage between the exhaust pipe and the inside of the exhaust pipe and the atmosphere through the hole. With a covering member
With
An exhaust system component mounted on the vehicle so that the end of the communication passage on the atmosphere side faces the lower side of the vehicle. The exhaust system component according to claim 1.
An exhaust system component in which the hole is located above the center of the exhaust pipe in a cross section perpendicular to the flow direction of exhaust gas in the exhaust pipe when the exhaust system component is mounted on the vehicle. The exhaust system component according to claim 1 or 2.
The exhaust pipe has a downwardly bent portion that bends downward of the vehicle when the vehicle is viewed from the side.
The hole is an exhaust system component provided upstream of the downward bending portion in the flow direction of the exhaust gas.

Images