JP2023183662A - exhaust system - Google Patents

Abstract

To standardize an exhaust system which is provided in a flow channel for an exhaust gas.SOLUTION: An exhaust system includes a plurality of fitting surfaces provided in a flow channel for an exhaust gas of a vehicle and fitted to an inner peripheral surface of a flow channel forming member for forming the flow channel for the exhaust gas. Each of the fitting surfaces has a shape capable of being fitted to the inner peripheral surface having different shapes.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to an exhaust device provided in an exhaust flow path of a vehicle.

A technique is known in which a device for stirring exhaust gas is provided inside the exhaust pipe of a vehicle. The exhaust agitation device disclosed in Patent Document 1 includes a ring-shaped main body joined to the inner circumferential surface of an exhaust pipe and a plurality of blades provided on the main body. By swirling the exhaust gas using the plurality of blades, uneven flow of the exhaust gas is suppressed.

Japanese Patent Application Publication No. 2014-214742

However, in the exhaust agitation device of Patent Document 1, the outer circumferential surface of the main body is joined to the inner circumferential surface of the exhaust pipe over its entire circumference. For this reason, the exhaust agitation device can only be connected to an exhaust pipe having a diameter that matches the diameter of the main body, and a common exhaust agitation device cannot be connected to exhaust pipes of different diameters.

One aspect of the present disclosure aims to standardize exhaust devices provided in exhaust flow paths.

One aspect of the present disclosure is an exhaust device that is provided in an exhaust flow path of a vehicle, and includes a plurality of mounting surfaces that are attached to an inner circumferential surface of a flow path forming member that forms an exhaust flow path. Each attachment surface has a shape that allows attachment to inner peripheral surfaces of different shapes.

According to the above configuration, the exhaust device can be attached to the inner circumferential surfaces of a plurality of flow path forming members having different shapes. Therefore, it is possible to use a common exhaust system.
One aspect of the present disclosure may further include a vane configured to agitate the exhaust gas flowing down the flow path.

According to the above configuration, it is possible to use a common device for stirring the flow of exhaust gas.
In one aspect of the present disclosure, the exhaust device may be provided upstream in the flow direction of exhaust gas with respect to the sensor provided in the flow path.

According to the above configuration, it is possible to suppress the deviation of exhaust gas passing through the sensor, and it is possible to improve the detection accuracy of the sensor.
One aspect of the present disclosure may further include a main body portion that is a cylindrical portion extending along the axis and having respective mounting surfaces provided on the outer circumferential surface thereof. The respective mounting surfaces may be arranged in a circumferential direction around the axis.

According to the above configuration, by changing the direction of the exhaust device by rotating the exhaust device about the axis, the mounting surface to be attached to the inner circumferential surface of the flow path forming member can be selected. Therefore, the exhaust device can be attached to the inner circumferential surfaces of different flow path forming members while suppressing changes in the direction of the axis.

It is a top view of the exhaust pipe to which the stirring device of the first embodiment is attached. It is a side view of the stirring device of a 1st embodiment. FIG. 2 is a front view of the agitation device of the first embodiment, in which the first attachment surface is attached to the inner circumferential surface of the exhaust pipe, as viewed from the upstream side in the flow direction of exhaust gas. FIG. 3 is a front view of the agitation device of the first embodiment, in which the second attachment surface is attached to the inner circumferential surface of the exhaust pipe, as viewed from the upstream side in the flow direction of exhaust gas. FIG. 7 is a front view of the agitation device of the second embodiment, in which the first attachment surface is attached to the inner circumferential surface of the exhaust pipe, as viewed from the upstream side in the flow direction of exhaust gas. FIG. 7 is a front view of the agitation device of the second embodiment in which the second attachment surface is attached to the inner circumferential surface of the exhaust pipe, viewed from the upstream side in the flow direction of exhaust gas.

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. overview]
The exhaust pipe 2 of the first embodiment is an example of a flow path forming member that forms a flow path 20 for exhaust gas from the engine of a vehicle. (See Figure 1).

For example, the sensor 3 is provided so as to protrude from the inner circumferential surface of the exhaust pipe 2 into the exhaust flow path 20 while passing through a hole passing through the exhaust pipe 2 . The sensor 3 is configured, for example, to detect the concentration of oxygen contained in the exhaust gas. Of course, the exhaust pipe 2 is not limited to this, and the exhaust pipe 2 may be provided with various sensors that detect the state of the exhaust.

The catalyst 4 is a member for purifying exhaust gas, and is arranged in a catalyst case 22 that constitutes a part of the exhaust pipe 2. The catalyst 4 is located downstream of the sensor 3 in the exhaust flow path 20 in the exhaust flow direction 21 . Further, the catalyst 4 has a plurality of flow paths extending in the exhaust flow direction 21, and modifies or collects environmental pollutants in the exhaust gas by contact with the exhaust gas passing through each flow path, thereby reducing the exhaust gas. Purify.

The stirring device 1 is provided inside the exhaust pipe 2 at a location on the upstream side of the sensor 3 in the flow direction 21 of the exhaust gas, and stirs the exhaust gas passing through the stirring device 1 . As a result, the exhaust gas reaching the sensor 3 is stirred and the concentration of the exhaust gas is promoted to be uniform, so that the detection accuracy of the sensor 3 is improved.

More specifically, the stirring device 1 is attached to the inner circumferential surface of the exhaust pipe 2 by, for example, welding or the like, but the stirring device 1 can be attached to a plurality of types of inner circumferential surfaces having different shapes. That is, the section of the exhaust pipe 2 to which the stirring device 1 is attached is, for example, cylindrical, and the cross section perpendicular to the flow direction 21 of the exhaust gas is circular. The stirring device 1 can be attached to a plurality of cylindrical exhaust pipes 2 having different cross-sectional diameters. The stirring device 1 includes a main body portion 10 and first to fourth blade portions 15 to 18 (see FIGS. 2 to 4).

[2. Main body]
The main body 10 is a substantially cylindrical portion extending along the axis 1A, and exhaust gas flows down inside the main body 10 (see FIGS. 2 to 4). Further, a cross section (hereinafter simply referred to as a cross section) of the main body portion 10 perpendicular to the axis 1A is approximately circular. It should be noted that the axis 1A passes approximately through the center of the cross section of the main body 10. Further, the stirring device 1 is attached to the inner circumferential surface of the exhaust pipe 2 so that the direction of the axis 1A substantially coincides with the flow direction 21 of exhaust gas.

[3. 1st to 4th mounting surface]
First to fourth mounting surfaces 11 to 14 are formed on the outer peripheral surface of the main body portion 10 (see FIGS. 2 to 4). The first to fourth mounting surfaces 11 to 14 each extend from the upstream end to the downstream end of the outer circumferential surface of the main body 10. Further, the first to fourth mounting surfaces 11 to 14 each form a circular arc having the same central angle in the cross section of the main body 10, and are adjacent to each other in a direction (hereinafter referred to as a circumferential direction) that revolves around the axis 1A. ). That is, each mounting surface is disposed at a position offset from the adjacent mounting surface by about 90° in the circumferential direction. Note that the first to fourth mounting surfaces 11 to 14 may be arranged in the circumferential direction with substantially constant intervals.

The first to fourth attachment surfaces 11 to 14 are portions that are attached to the inner peripheral surface of the exhaust pipe 2 in which the stirring device 1 is provided, and have different shapes. That is, the first to fourth mounting surfaces 11 to 14 form circular arcs with radii of R1 to R4 in the cross section of the main body 10, respectively. It should be noted that R1 to R4 mean different values just in case.

Therefore, most of the first to fourth mounting surfaces 11 to 14 can come into contact with the inner circumferential surface of the exhaust pipe, which forms a circle with a radius of R1 to R4 in its cross section. As an example, it can be attached to the inner peripheral surface of the exhaust pipe by welding (see FIGS. 3 and 4). In other words, by having the first to fourth mounting surfaces 11 to 14, the stirring device 1 can be used on the inner circumferential surfaces of four types of exhaust pipes having different radii (in other words, shapes) of the inner circumferential surfaces in cross section. It can be installed.

[4. Modified examples of main body and mounting surface]
The number of attachment surfaces provided on the main body portion 10 is not limited to four, and may be determined as appropriate. Further, the mounting surface is not limited to the inner circumferential surface of the cylindrical exhaust pipe 2, but may be attachable to the inner circumferential surface of exhaust pipes of various shapes. Specifically, the shape of each mounting surface in the cross section of the main body portion 10 is, for example, flat, V-shaped, etc., and each mounting surface is arranged on the inner periphery of the exhaust pipe where most of the mounting surface can come into contact. It may be attached to a surface.

Further, the main body portion 10 is not limited to a substantially cylindrical shape, but may be formed as a cylindrical portion having a cross section of various shapes (for example, a polygon, etc.) depending on the shape of the mounting surface, for example.
[5. 1st to 4th blade section]
The first to fourth blade parts 15 to 18 are parts for stirring the exhaust gas flowing down inside the main body part 10, and are provided corresponding to the first to fourth mounting surfaces 11 to 14, respectively (Fig. (See 2-4). Specifically, each blade portion is provided so as to protrude from approximately the center in the circumferential direction at the downstream end of the main body portion 10 adjacent to the corresponding mounting surface. Each blade portion is a substantially triangular plate-shaped portion, which becomes thinner toward the downstream side and is inclined with respect to the axis 1A so as to approach the axis 1A toward the downstream side.

That is, the first to fourth blade parts 15 to 18 are provided at the downstream end of the main body part 10 at substantially constant intervals in the circumferential direction. Moreover, each blade part is spaced apart from other blade parts, and the tip of each blade part is located near the axis 1A.

Note that the number of blade portions is not limited to four, and may be determined as appropriate. Specifically, for example, a mounting surface without a corresponding blade portion may be provided, or a plurality of blade portions may be provided corresponding to the mounting surface. Further, the shape of each blade portion is not limited to a substantially triangular shape, and may be determined as appropriate. Thereby, the stirring ability of the stirring device 1 can be adjusted.

Further, for example, the blade portion does not have to approach the axis 1A as it goes downstream. Further, for example, the shapes of the blades may be different from each other, and each blade may be attached to a separate member provided on the inner peripheral surface of the main body 10.

[Second embodiment]
[6. overview]
The stirring device 1 of the second embodiment has the same configuration as the stirring device 1 of the first embodiment, but differs from the first embodiment in the configurations of the main body portion 10 and the first to fourth blade portions 15 to 18. (See Figures 5 and 6). Below, differences between the stirring device 1 of the second embodiment and the first embodiment will be explained.

[7. Main body and first to third mounting surfaces]
The main body portion 10 is a groove-shaped portion extending along the axis 1A, and the cross section of the main body portion 10 is approximately arc-shaped (see FIGS. 5 and 6). Note that, as an example, the central angle of the cross section is approximately 270°, but the value of the central angle may be determined as appropriate. Further, the axis 1A passes approximately through the center of the cross section of the main body portion 10.

The main body portion 10 has first to third mounting surfaces 11 to 13 formed on its outer peripheral surface. The first to third mounting surfaces 11 to 13 are configured similarly to the mounting surfaces in the first embodiment, and form circular arcs with radii of R1 to R3 in the cross section of the main body portion 10. That is, when the main body portion 10 is viewed from the axial direction, each of the first to third mounting surfaces 11 to 13 has a center angle of about 90°. Further, the first to third mounting surfaces 11 to 13 are arranged along the cross section of the main body portion 10.

Therefore, the first to third mounting surfaces 11 to 13 are capable of coming into contact with the inner circumferential surface of a cylindrical exhaust pipe whose inner circumferential surface radius in its cross section is R1 to R3, respectively. For example, it can be attached to the inner peripheral surface of the exhaust pipe by welding. That is, the stirring device 1 of the second embodiment can be attached to the inner circumferential surfaces of three types of exhaust pipes having different radii of the inner circumferential surfaces in cross section.

In addition, also in 2nd Embodiment, the number of attachment surfaces provided in the main body part 10 may be determined suitably. Further, as in the first embodiment, the mounting surface is not limited to the inner circumferential surface of the cylindrical exhaust pipe 2, but may be attachable to the inner circumferential surface of exhaust pipes of various shapes. Further, the shape of the cross section of the main body portion 10 is not limited to a substantially arcuate shape, but may be determined depending on, for example, the shape of the mounting surface.

[8. 1st to 3rd blade section]
The stirring device 1 of the second embodiment differs from the first embodiment in the number of blades, and the main body 10 is provided with first to third blades 15 to 17 (see FIGS. 5 and 6). ). The first to third blade portions 15 to 17 are provided corresponding to the first to third mounting surfaces 11 to 13, respectively, similarly to the first embodiment. Of course, the number of blade parts is not limited to three, and can be determined as appropriate.

[9. effect]
(1) The stirring device 1 of the first and second embodiments can be attached to the inner peripheral surfaces of a plurality of exhaust pipes 2 having different cross-sectional radii. Therefore, it is possible to use the stirring device 1 in common. Moreover, by standardizing the stirring device 1, it is expected that the burden of design and testing will be reduced, and development costs can be reduced.

(2) Further, the stirring device 1 is provided upstream of the sensor 3 in the exhaust flow path 20. Therefore, the deviation of the exhaust gas passing through the sensor 3 can be suppressed, and the detection accuracy of the sensor 3 can be improved. In particular, in recent years, there has been a demand for improvement in exhaust purification performance in order to comply with environmental regulations, but by improving the detection accuracy of the sensor 3 as in the above embodiment, it is possible to promote improvement in exhaust purification performance. be able to.

(3) Furthermore, in the stirring device 1 of the first embodiment, the first to fourth mounting surfaces 11 to 14 are formed on the outer peripheral surface of the cylindrical main body portion 10. Further, in the stirring device 1 of the second embodiment, first to third mounting surfaces 11 to 13 are formed on the outer peripheral surface of the main body portion 10 having an arcuate cross section. Therefore, the stirring device 1 can be satisfactorily attached to the inner circumferential surfaces of a plurality of exhaust pipes 2 having different cross-sectional radii.

(4) Furthermore, in the stirring device 1 of the first embodiment, the first to fourth mounting surfaces 11 to 14 are arranged in the circumferential direction on the outer peripheral surface of the main body portion 10. Further, in the stirring device 1 of the second embodiment, the first to third mounting surfaces 11 to 13 are arranged along the cross section of the main body portion 10.

Thereby, by changing the direction of the stirring device 1 by rotating around the axis 1A, the mounting surface to be attached to the inner circumferential surface of the exhaust pipe 2 can be selected. Therefore, the stirring device 1 can be attached to the inner circumferential surface of a different exhaust pipe 2 while suppressing a change in the direction of the axis 1A. As a result, it is possible to suppress differences in performance of the stirring device 1 depending on the type of exhaust pipe 2 attached. Therefore, it is difficult to change the mounting position of the stirring device 1 depending on the type of exhaust pipe 2 to which the stirring device 1 is attached.

[10. Other embodiments]
(1) In the stirring device 1 of the first and second embodiments, a plurality of mounting surfaces may be formed on the outer peripheral surface of the main body 10 so as to be lined up along the axis 1A. Even in the case of having such a configuration, by changing the inclination of the stirring device 1 with respect to the flow direction 21 of the exhaust gas, it is possible to attach the stirring device 1 to the inner circumferential surface of an exhaust pipe of a different shape. .

(2) In an exhaust device other than the agitation device provided in the exhaust flow path of a vehicle, similarly to the first or second embodiment, a shape that can come into contact with the inner circumferential surface of a flow path forming member of a different shape is provided. A plurality of mounting surfaces may be provided. Note that an exhaust device is, for example, a device that is attached to the inner peripheral surface of a flow path forming member that forms an exhaust flow path in a muffler, and that forms a silencing chamber within the muffler or holds a silencing member within the muffler. It may also be a device that does this.

(3) In addition, when the stirring device is provided with four or more mounting surfaces, the difference in curvature of mounting surfaces that are adjacent in the circumferential direction is larger than the difference in curvature of mounting surfaces that are not adjacent to each other in the circumferential direction. The curvature of each mounting surface may be determined. By doing so, when attaching the agitation device to the inner circumferential surface of the flow path forming member, it becomes easier to select the attachment surface to be brought into contact with the inner circumferential surface.

(4) Multiple functions of one component in the above embodiment may be realized by multiple components, and one function of one component may be realized by multiple 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.

[11. Word correspondence]
The stirring device 1 in the first and second embodiments corresponds to an example of an exhaust device.

DESCRIPTION OF SYMBOLS 1... Stirring device, 1A... Axis line, 10... Main body part, 11-14... 1st - 4th mounting surface, 15-18... 1st - 4th blade part, 2... Exhaust pipe, 20... Channel, 21... Exhaust flow direction, 3...sensor.

Claims (4)

An exhaust device provided in an exhaust flow path of a vehicle,
comprising a plurality of mounting surfaces attached to an inner circumferential surface of a flow path forming member that forms the flow path for the exhaust gas,
Each of the mounting surfaces has a shape that allows attachment to the inner peripheral surface of a different shape. The exhaust device according to claim 1,
The exhaust device further includes: a blade portion configured to agitate the exhaust gas flowing down the flow path. The exhaust device according to claim 2,
The exhaust device is provided upstream in the flow direction of the exhaust gas with respect to the sensor provided in the flow path. The exhaust device according to any one of claims 1 to 3,
further comprising a main body part that is a cylindrical part extending along the axis, the outer peripheral surface of which is provided with each of the mounting surfaces,
The respective mounting surfaces are arranged in a circumferential direction around the axis.

Images