JP2023176665A - Exhaust device - Google Patents

Abstract

To suppress the influence of vibration.SOLUTION: An exhaust device is a device loaded on a vehicle and includes a shell forming an exhaust gas flow channel, a shell wall portion, and a sensor wall portion. The shell wall portion is formed by deforming the shell and projects to the outside of the exhaust gas flow channel from an edge portion surrounding a hole formed in the shell. The sensor wall portion is a cylindrical region constituted to mount the sensor on an inner peripheral surface. Further the sensor wall portion is provided inside of the shell wall portion in a manner that an outer peripheral surface of the sensor wall portion is disposed adjacent to an inner peripheral surface of the shell wall portion.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an exhaust system mounted on a vehicle.

2. Description of the Related Art A technique is known in which a sensor for detecting the state of exhaust gas of a vehicle is mounted on an exhaust pipe. As an example, in the technique disclosed in Patent Document 1, a sensor is attached to an exhaust pipe by a mounting member welded to the outer peripheral surface of the exhaust pipe. The mounting member is arranged so that the through hole of the mounting member communicates with the hole of the exhaust pipe, and the sensor is screwed into the thread formed on the inner peripheral surface of the through hole, and the sensor is inserted into the exhaust pipe. It is provided so as to protrude.

JP2002-285838A

However, with the technique disclosed in Patent Document 1, there is a risk that the sensor attached to the mounting member may be damaged due to the influence of vehicle vibration.
One aspect of the present disclosure aims to suppress the influence of vibration.

One aspect of the present disclosure is an exhaust system that is mounted on a vehicle, and includes a shell, a shell wall, and a sensor wall. The shell forms a flow path for exhaust gas. The shell wall is a part formed by deforming the shell, and is provided so as to protrude outside the exhaust gas flow path from the edge surrounding the hole formed in the shell, and is a part surrounding the hole. be. The sensor wall is a cylindrical portion configured to have a sensor attached to its inner peripheral surface. Further, the sensor wall is arranged inside the shell wall such that the outer peripheral surface of the sensor wall is adjacent to the inner peripheral surface of the shell wall.

According to the above configuration, the sensor wall portion to which the sensor is attached is arranged adjacent to the inner circumferential surface of the shell wall portion formed by deforming the shell. Therefore, vibrations can be absorbed or alleviated at the sensor mounting location, and the influence of vibrations can be suppressed.

One aspect of the present disclosure further includes a seal portion that is provided to connect the top of the shell wall and the end of the sensor wall and is configured to abut the sensor attached to the sensor wall. Good too.

According to the above configuration, it is possible to attach the sensor while suppressing welding in the vicinity of the sensor. Therefore, the influence of thermal strain due to welding can be suppressed.
In one aspect of the present disclosure, the seal portion may be formed to protrude from the outer peripheral surface of the shell wall portion.

According to the above configuration, the area of the portion of the seal portion that comes into contact with the sensor can be increased, and the sealing performance is improved.
One aspect of the present disclosure provides an outer wall portion that surrounds the shell wall portion and is arranged such that the inner circumferential surface thereof is adjacent to the outer circumferential surface of the shell wall portion; The sensor further includes a joint part that is a part to be joined, and a seal part configured to connect an end of the outer wall part and an end of the sensor wall part and to come into contact with a sensor attached to the sensor wall part. You can.

According to the above configuration, it is possible to attach the sensor while suppressing welding in the vicinity of the sensor. Therefore, the influence of thermal strain due to welding can be suppressed.
In one aspect of the present disclosure, a gap may be provided between the inner peripheral surface of the shell wall and the outer peripheral surface of the sensor wall.

According to the above configuration, it is possible to further promote the absorption or relaxation of vibrations at the mounting location of the sensor, and it is possible to suppress the influence of vibrations.

FIG. 3 is a cross-sectional view including an axis of the sensor mounting portion of the first embodiment. FIG. 3 is a cross-sectional view including an axis of the sensor mounting portion of the first embodiment. FIG. 7 is a cross-sectional view including the axis of the sensor mounting portion of the second embodiment. FIG. 7 is a cross-sectional view including the axis of the sensor mounting portion of the third embodiment.

Embodiments of the present disclosure will be described below with reference to the drawings. Note that the embodiments of the present disclosure are not limited to the embodiments described below, and may take various forms as long as they fall within the technical scope of the present disclosure.

[First embodiment]
[1. Sensor mounting part]
In the first embodiment, an exhaust pipe 1 that forms a flow path 11 for exhaust gas from a vehicle engine is provided with a sensor mounting portion 2 for mounting a sensor 3 (see FIGS. 1 and 2). In this embodiment, an A/F sensor that detects the air-fuel ratio in exhaust gas is attached to the sensor attachment part 2, as an example. A sensor element is provided at the tip of the sensor 3, and the sensor 3 is arranged so that the tip protrudes into the exhaust gas flow path 11. Of course, various sensors can be attached to the sensor attachment part 2 instead of the A/F sensor.

In addition, the sensor 3 has a main body part and a tip part as an example. The tip portion has a cylindrical shape, is provided so as to protrude from the main body portion, and is thinner than the main body portion. Further, the tip portion is arranged to protrude into the exhaust gas flow path 11, and the main body portion contacts a contact surface 24A of a seal portion 24, which will be described later. Further, a thread groove (thread thread) is formed on the outer circumferential surface of the tip.

The exhaust pipe 1 has a metal shell 10 that separates an exhaust flow path 11 from the outside of the exhaust pipe 1, and a sensor mounting portion 2 is formed in a sensor mounting hole 20 that penetrates the shell 10. The shape of the sensor mounting hole 20 is, for example, circular, but may be determined as appropriate depending on, for example, the shape of the sensor 3 and the like. The sensor attachment section 2 includes a shell wall section 21, a sensor wall section 23, and a seal section 24.

[2. shell wall]
The shell wall portion 21 is a wall-shaped portion that is provided so as to protrude from the edge surrounding the sensor mounting hole 20 to the outside of the exhaust gas flow path 11, and surrounds the sensor mounting hole 20 (see FIGS. 1 and 2). The shell wall portion 21 has a cylindrical shape, for example, and extends along the axis 2A. Note that the axis 2A passes through the center of the sensor mounting hole 20 and is orthogonal to the sensor mounting hole 20. Of course, the shape of the shell wall portion 21 is not limited to this, and can be determined as appropriate depending on, for example, the shape of the sensor 3.

Further, a curved portion R22 is provided in a portion of the shell wall portion 21 located near the sensor mounting hole 20, in other words, a portion located at the root of the shell wall portion 21. R22 is formed when performing burring processing (details will be described later) to form the shell wall portion 21. However, the present invention is not limited to this, and even if the shell wall portion 21 is formed by a method other than burring, the R22 may be provided at the portion located at the base of the shell wall portion 21.

[3. Sensor wall]
The sensor wall portion 23 is a cylindrical portion extending from the first end 23A to the second end 23B, and is configured such that the sensor 3 is attached to the inner peripheral surface (see FIGS. 1 and 2). As an example, a screw 23C is formed on the inner peripheral surface of the sensor wall 23, and the sensor 3 is attached so as to penetrate through the sensor wall 23 while being screwed onto the screw 23C. The tip of the sensor 3 protrudes from the sensor mounting hole 20 into the exhaust gas flow path 11 . Note that, as an example, the sensor wall portion 23 has a cylindrical shape. However, the shape of the sensor wall portion 23 is not limited to this, and may be determined as appropriate depending on, for example, the shape of the sensor 3.

Further, the sensor wall 23 is arranged inside the shell wall 21 such that its outer peripheral surface 23D is adjacent to the inner peripheral surface 21B of the shell wall 21. Specifically, the outer peripheral surface 23D of the sensor wall 23 may be in contact with the inner peripheral surface 21B of the shell wall 21 (see FIG. 1), or the outer peripheral surface 23D of the sensor wall 23 and the shell wall may be in contact with the inner peripheral surface 21B of the shell wall 21 (see FIG. 1). A gap may be formed between the inner circumferential surface 21B of 21 (see FIG. 2).

Further, the first end 23A of the sensor wall 23 is located on the top 21A side of the shell wall 21, and the second end 23B is located on the root side of the shell wall 21. The second end 23B of the sensor wall 23 does not protrude from the sensor mounting hole 20 and is located inside the shell wall 21. That is, the second end 23B of the sensor wall 23 is located closer to the top 21A of the shell wall 21 than the sensor mounting hole 20 is. Thereby, it is possible to suppress the sensor wall portion 23 from interfering with the flow of exhaust gas in the flow path 11 .

[4. Seal part]
The seal portion 24 is provided to connect the top portion 21A of the shell wall portion 21 and the first end 23A of the sensor wall portion 23 (see FIGS. 1 and 2). Further, the seal portion 24 has a contact surface 24A that comes into contact with the sensor 3 (more specifically, the main body portion of the sensor 3) attached to the sensor wall portion 23. Since the contact surface 24A contacts the main body of the sensor 3, exhaust gas is suppressed from flowing out from the first end 23A of the sensor wall 23. Note that when the area of the contact surface 24A is large, sealing performance is improved.

[5. Formation method of sensor mounting part]
The shell wall portion 21, the sensor wall portion 23, and the seal portion 24 in the sensor mounting portion 2 are formed by deforming the shell 10. Therefore, the shell wall portion 21, the sensor wall portion 23, and the seal portion 24 are provided on the shell 10 without welding.

As an example, these portions may be formed by performing burring on the shell 10. That is, by performing a burring process on the sensor mounting hole 20 of the shell 10, a cylindrical portion (hereinafter referred to as a cylindrical portion) that protrudes from the edge surrounding the sensor mounting hole 20 to the outside of the exhaust gas flow path 11 is formed. You may do so. Then, the portion including the top of the cylindrical portion may be folded back inside the cylindrical portion. As a result, the outer portion and the inner portion of the folded cylindrical portion form the shell wall portion 21 and the sensor wall portion 23, respectively, and the folded portion forms the seal portion 24.

Besides this, a similar cylindrical portion may be formed by elongating the shell 10 by a method other than burring. Then, the shell wall portion 21, the sensor wall portion 23, and the seal portion 24 may be formed by folding the cylindrical portion inward in the same manner.

[Second embodiment]
[6. overview]
The exhaust pipe 1 of the second embodiment has the same configuration as the exhaust pipe 1 of the first embodiment, but differs from the first embodiment in the seal portion 24 in the sensor mounting portion 2 (see FIG. 3). Below, differences in the exhaust pipe 1 of the second embodiment from the first embodiment will be explained.

[7. Seal part]
The seal portion 24 of the second embodiment is provided so as to connect the top portion 21A of the shell wall portion 21 and the first end 23A of the sensor wall portion 23, as in the first embodiment (see FIG. 3). However, the seal portion 24 is formed as a flange-shaped portion that projects radially outward from the outer peripheral surface of the shell wall portion 21 .

That is, the seal portion 24 has a first portion 24B that extends outward from the top portion 21A of the shell wall portion 21, and a second portion 24C that extends so as to overlap the first portion 24B. The outer edge of the second portion 24C is connected to the outer edge of the first portion 24B, and the inner edge of the second portion 24C is connected to the first end 23A of the sensor wall 23.

A contact surface 24A that can come into contact with the sensor 3 attached to the sensor wall portion 23 is formed on the second portion 24C.
Note that in the second embodiment as well, the shell wall portion 21, the sensor wall portion 23, and the seal portion 24 are formed by deforming the shell 10 by burring or the like, as in the first embodiment. Therefore, these parts are provided in the shell 10 without welding.

[Third embodiment]
[8. overview]
The exhaust pipe 1 of the third embodiment has the same configuration as the exhaust pipe 1 of the first embodiment, but differs from the first embodiment in the sensor mounting portion 2 (see FIG. 3). Below, differences in the exhaust pipe 1 of the third embodiment from the first embodiment will be explained.

The sensor attachment part 2 of the third embodiment includes a shell wall part 21 and a boss member 4.
Similar to the first embodiment, the shell wall portion 21 is a wall-shaped portion that is provided so as to protrude from the edge surrounding the sensor mounting hole 20 to the outside of the exhaust gas flow path 11, and surrounds the sensor mounting hole 20. Similar to the first embodiment, R22 is provided at the root portion of the shell wall portion 21. Further, the shell wall portion 21 is formed by deforming the shell 10, similarly to the first embodiment. Therefore, in the third embodiment, at least the shell wall portion 21 is provided on the shell 10 without welding. Specifically, the shell wall portion 21 may be formed by burring, or may be formed by extending the shell 10 by a method other than burring.

Further, the boss member 4 is a member attached to the shell wall portion 21 and includes a sensor wall portion 40, a seal portion 41, an outer wall portion 42, and a joint portion 44. The boss member 4 is formed by deforming a metal base material separated from the shell 10 and the shell wall 21, and includes the sensor wall 40, the seal portion 41, the outer wall 42, and the joint portion. 44 is integrated without welding.

[9. Sensor wall]
Similar to the first embodiment, the sensor wall portion 40 is a cylindrical portion extending from the first end 40A to the second end 40B, and is configured such that the sensor 3 is attached to the inner peripheral surface (see FIG. 4). . As an example, similar to the first embodiment, the sensor 3 is attached so as to penetrate through the sensor wall 40 while being screwed into a screw 40C formed on the inner circumferential surface of the sensor wall 40.

Further, similarly to the first embodiment, the sensor wall 40 is arranged inside the shell wall 21 such that its outer circumferential surface 40D is adjacent to the inner circumferential surface 21B of the shell wall 21. Further, the outer peripheral surface 40D of the sensor wall 40 may be in contact with the inner peripheral surface 21B of the shell wall 21, or a gap may be formed between the outer peripheral surface 40D and the inner peripheral surface 21B. Also good.

Further, like the first embodiment, the first end 40A of the sensor wall 40 is located on the top 21A side of the shell wall 21. Further, the second end 40B of the sensor wall 40 is located on the root side of the shell wall 21, does not protrude from the sensor mounting hole 20, and is located inside the shell wall 21. Further, as an example, the sensor wall portion 40 has a cylindrical shape, but the shape of the sensor wall portion 40 is appropriately determined depending on the shape of the sensor 3 and the like, for example.

[10. Outer wall]
The outer wall portion 42 is a cylindrical portion extending from the first end 42A to the second end 42B, and is arranged so as to surround the shell wall portion 21 and have an inner circumferential surface adjacent to an outer circumferential surface of the shell wall portion 21. (See Figure 4). Further, the inner circumferential surface of the outer wall portion 42 may be in contact with the outer circumferential surface of the shell wall portion 21, or a gap may be formed between the inner circumferential surface and the outer circumferential surface.

Further, the first end 42A of the outer wall portion 42 is located on the top 21A side of the shell wall portion 21, and the second end 42B is located on the root side of the shell wall portion 21. Furthermore, as an example, the outer wall portion 42 has a cylindrical shape, but the shape of the outer wall portion 42 is appropriately determined depending on the shape of the sensor 3 and the like, for example.

[11. Seal part]
The seal portion 41 is provided to connect the first end 42A of the outer wall portion 42 and the first end 40A of the sensor wall portion 40 (see FIG. 4). Further, the seal portion 41 has a contact surface 41A that can come into contact with the sensor 3 attached to the sensor wall portion 40. By the contact surface 41A contacting the sensor 3, exhaust gas is suppressed from flowing out from inside the sensor wall portion 40. Note that, similarly to the second embodiment, the seal portion 41 may be formed as a flange-shaped portion that protrudes radially outward from the outer circumferential surface of the shell wall portion 21.

[12. Joint]
The joint portion 44 is a flange-shaped portion that extends radially outward from the second end 42B of the outer wall portion 42 (see FIG. 4). Further, a curved portion R43 is provided in the joint portion 44 and the portion of the outer wall portion 42 near the second end 42B of the outer wall portion 42.

Further, the joint portion 44 is arranged so as to overlap the outer circumferential surface of the shell 10. Further, the joint portion 44 is joined to the shell 10 by spot welding the weld portion 44A, for example. However, the joint portion 44 is not limited to this, and may be joined to the shell 10 by other welding methods, or may be joined to the shell 10 by a method other than welding (for example, caulking, etc.).

[13. effect]
(1) According to the first to third embodiments, the sensor walls 23 and 40 to which the sensor 3 is attached are arranged adjacent to the inner circumferential surface 21B of the shell wall 21, and the first end 23A, It is supported by seal parts 24 and 41 at 40A. Therefore, it is possible to absorb or alleviate vibrations in the sensor mounting portion 2, and it is possible to suppress the influence of vibrations generated in the engine of the vehicle or the like. Thereby, damage to the sensor 3 can be suppressed.

Further, the sensor mounting portion 2 of the first to third embodiments does not include a mesh, mat, resin, or the like, and is made of metal. Therefore, aging deterioration in the sensor mounting portion 2 can be suppressed. Further, since these sensor mounting portions 2 are configured to support the sensor 3 using wall-like portions that overlap in two or three layers, strength and sealing performance are improved.

Further, in the first and second embodiments, the shell wall portion 21 and the sensor wall portion 23 are formed by deforming the shell 10, and also in the third embodiment, the shell wall portion 21 is formed by deforming the shell 10. It is formed. Therefore, misalignment between the sensor mounting hole 20 and the sensor walls 23 and 40 is unlikely to occur, and the sensor 3 can be mounted quickly and reliably. Note that in the third embodiment, the boss member 4 may be made of a material different from that of the shell wall portion 21.

(2) Furthermore, since the shell wall portion 21 is formed by burring, R22 is formed at the root of the shell wall portion 21. Therefore, a gap can be provided around the base of the shell wall portion 21. Thereby, absorption or relaxation of vibrations in the sensor mounting portion 2 can be further promoted, and the influence of vibrations can be suppressed. Furthermore, by adjusting the size and/or curvature of R22, the frequency of vibration to be suppressed can be adjusted.

(3) Further, in the first and second embodiments, the top portion 21A of the shell wall portion 21 and the first end 23A of the sensor wall portion 23 are connected by the seal portion 24. Therefore, the sensor mounting portion 2 can be constructed without welding, and the influence of thermal distortion due to welding can be eliminated.

Further, since the structure is such that the seal portion 24 connects the top portion 21A of the shell wall portion 21 and the first end 23A of the sensor wall portion 23, a wide contact surface 24A can be secured. Furthermore, since the seal portion 24 is supported by the shell wall portion 21 and the sensor wall portion 23, the seal portion 24 can be pressed more strongly toward the sensor 3, thereby increasing the adhesion between the seal portion 24 and the sensor 3. I can do it. Therefore, sealing performance is improved.

(4) Furthermore, in the second embodiment, the seal portion 24 is formed to protrude radially outward from the outer peripheral surface of the shell wall portion 21. This spreads the contact surface 24A and improves sealing performance. Further, by widening the contact surface 24A, a larger sensor can be attached to the sensor attachment part 2 favorably.

(5) Furthermore, in the third embodiment, since the joint portion 44 of the boss member 4 is joined to the shell 10, welding near the sensor 3 can be avoided. Therefore, the influence of thermal strain due to welding can be suppressed.

Further, the seal portion 41 is supported by the shell wall portion 21, the sensor wall portion 40, and the outer wall portion 42. Therefore, it is possible to secure a wide contact surface 24A of the seal portion 24 against the sensor 3, and also to press the seal portion 41 more strongly toward the sensor 3, thereby increasing the adhesion between the seal portion 41 and the sensor 3. . Therefore, sealing performance is improved. Furthermore, by widening the contact surface 24A, a larger sensor 3 can be attached to the sensor attachment part 2. Note that a seal member (for example, a gasket or the like) may be arranged between the sensor 3 and the seal portion 41.

(6) Furthermore, in the first to third embodiments, by providing a gap between the inner circumferential surface 21B of the shell wall 21 and the outer circumferential surfaces 23D, 40D of the sensor walls 23, 40, the sensor mounting portion 2 It is possible to further promote the absorption or relaxation of vibrations, and to suppress the influence of vibrations. In the third embodiment, a gap may be provided between the outer circumferential surface of the shell wall portion 21 and the inner circumferential surface of the outer wall portion 42 to further promote vibration absorption or relaxation.

[14. Other embodiments]
(1) The sensor mounting portion 2 and sensor 3 of the first to third embodiments are not limited to the exhaust pipe 1, but are applicable to various exhaust devices (for example, a muffler, an exhaust gas purification device, etc.) that form a flow path for vehicle exhaust gas. may be provided.

(2) A plurality of functions of one component in the above embodiment may be realized by a plurality of components, and a function of one component may be realized by a plurality of components. . Further, a plurality of functions possessed by a plurality of constituent elements may be realized by one constituent element, or one function realized by a plurality of constituent elements may be realized by one constituent element. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of other embodiments.

[15. Word correspondence]
The exhaust pipe 1 of the first to third embodiments corresponds to an example of an exhaust device.

DESCRIPTION OF SYMBOLS 1...Exhaust pipe, 10...Shell, 11...Flow path, 2...Sensor mounting part, 20...Sensor mounting hole, 21...Shell wall part, 21A...Top part, 22...R, 23...Sensor wall part, 23D...Outer peripheral surface , 24...Seal part, 24A...Abutment surface, 3...Sensor, 4...Boss member, 40...Sensor wall part, 40D...Outer peripheral surface, 41...Seal part, 41A...Abutment surface, 42...Outer wall part, 42A ...first end, 42B...second end, 44...junction, 44A...welding part.

Claims (5)

An exhaust system mounted on a vehicle,
A shell that forms an exhaust gas flow path;
A portion formed by deforming the shell, protruding from an edge surrounding the hole formed in the shell to the outside of the exhaust gas flow path, and surrounding the hole. a shell wall;
a sensor wall portion that is a cylindrical portion configured such that the sensor is attached to the inner circumferential surface;
The sensor wall is arranged inside the shell wall so that the outer peripheral surface of the sensor wall is adjacent to the inner peripheral surface of the shell wall. The exhaust device according to claim 1,
The exhaust device further includes a seal portion that is provided to connect a top portion of the shell wall portion and an end portion of the sensor wall portion, and is configured to abut the sensor attached to the sensor wall portion. The exhaust device according to claim 2,
The seal portion is formed to protrude from the outer peripheral surface of the shell wall portion. The exhaust device according to claim 1,
an outer wall portion surrounding the shell wall portion and disposed such that an inner peripheral surface thereof is adjacent to an outer peripheral surface of the shell wall portion;
a joint part that is a part connected to the outer wall part and joined to the shell;
The exhaust device further includes: a seal portion that connects an end of the outer wall portion and an end of the sensor wall portion and is configured to abut the sensor attached to the sensor wall portion. The exhaust device according to any one of claims 1 to 4,
An exhaust device, wherein a gap is provided between an inner circumferential surface of the shell wall and an outer circumferential surface of the sensor wall.

Images