JP6831357B2 - Muffler - Google Patents

Description

The present disclosure relates to mufflers.

The muffler of Patent Document 1 has a partition plate that partitions the inside of the muffler into an upstream side and a downstream side and has a communication portion, and a valve device provided on the partition plate. The valve device has a valve body that adjusts the amount of exhaust gas passing through the communication portion, and a case that forms a storage space for accommodating the valve body. The case covers the communication section and connects to a downstream pipe that guides the exhaust to the outlet. Further, the valve body adjusts the amount of exhaust gas passing through the communication portion by opening and closing the hole portion of the case from the inside of the case.

Japanese Unexamined Patent Publication No. 2016-125473

Here, in the valve device of Patent Document 1, an opening / closing mechanism such as a shaft or a spring is provided on the valve body. Further, this opening / closing mechanism is arranged on the side of the front region of the hole portion of the case in the accommodation space of the valve body. Then, in the accommodation space, turbulence or retention of exhaust gas may occur in the vicinity of the opening / closing mechanism, which may cause noise.

In one aspect of the present disclosure, it is desirable to suppress the noise of the muffler.

One aspect of the present disclosure is a muffler mounted on a vehicle and allowing exhaust gas from an engine to flow down, and includes a partition portion, a tapered portion, a case portion, a valve body, and an urging portion. The partition portion is a plate-shaped part that divides the internal space of the muffler into an upstream space and a downstream space arranged in the flow direction. The upstream space is a space on the exhaust inlet side of the muffler, and the downstream space is a downstream space. , The space on the outlet side of the exhaust in the muffler. The tapered portion is a tubular portion that protrudes into the downstream space from the edge of the intermediate opening, which is an opening provided in the partition portion, and is a tapered portion that becomes thinner toward the downstream space side. The case portion is a part that protrudes from the partition portion into the upstream space and covers the intermediate opening, and is an opening that partitions the intermediate space and the upstream space, which is the space including the intermediate opening, and connects the intermediate space and the upstream space. It is the part that has the mouth. The valve body is arranged in the intermediate space, and is a part that adjusts the degree of opening of the upstream port by rotating around the axis and displacing between the closed position and the open position. It is a part that reduces the degree of opening of the mouth. The urging portion urges the valve body so that the valve body is displaced toward the closed position. Then, when the upstream port is projected onto the intermediate port along the flow direction, the edge of the intermediate port is located outside the edge of the upstream port.

According to the above configuration, the upstream port of the case portion is located inside the intermediate port, and the tapered portion projects toward the downstream space side from the edge of the intermediate port. Therefore, in the intermediate space, a wider space can be secured on the side of the front region of the upstream port. As a result, even if the valve body opening / closing mechanism such as the shaft and the urging part is arranged on the side of the front area of the upstream port, a wider space can be secured in the vicinity of the opening / closing mechanism, and the exhaust gas turbulence in the vicinity of the opening / closing mechanism And retention is suppressed.

Further, the tapered portion is inclined so as to become thinner toward the downstream space side. Therefore, for example, even when the upstream port is open, the exhaust flow can be smoothed in the region on the intermediate port side of the valve body in the intermediate space.

Therefore, the noise of the muffler can be suppressed.
In one aspect of the present disclosure, when the valve body is projected onto the intermediate port along the flow direction, the edge of the intermediate port may be located outside the outer edge of the valve body.

According to the above configuration, since the valve body is located inside the intermediate port, a wider space can be secured on the side of the valve body in the intermediate space. As a result, even if the opening / closing mechanism of the valve body is provided at the edge of the valve body, a wider space can be secured in the vicinity of the opening / closing mechanism, and turbulence and retention of exhaust gas in the vicinity of the opening / closing mechanism are suppressed. Therefore, the noise of the muffler can be suppressed.

In one aspect of the present disclosure, the case may have a side wall and a bottom. The side wall is a portion that protrudes from the partition portion toward the upstream space side, is arranged along the edge of the intermediate opening, and is a portion that surrounds the intermediate opening. The bottom is provided with an upstream opening and is a wall-shaped portion facing the intermediate opening.

According to the above configuration, in the intermediate space, a wider space can be secured near the edge of the intermediate port, and as a result, a wider space is secured on the side of the front region of the upstream port and on the side of the valve body. Therefore, turbulence and retention of exhaust gas in the vicinity of the valve body opening / closing mechanism can be suppressed, and as a result, muffler noise is suppressed.

In one aspect of the present disclosure, the length of the flow direction in the case portion may be larger than the length of the flow direction in the tapered portion.
According to the above configuration, a wider space is secured on the case portion side in the intermediate space. Therefore, a wider space can be secured in the vicinity of the valve body opening / closing mechanism. Therefore, turbulence and retention of exhaust gas in the vicinity of the valve body opening / closing mechanism can be suppressed, and as a result, muffler noise is suppressed.

In one aspect of the present disclosure, the opening on the downstream space side of the tapered portion may be the downstream opening. The shaft may be located lateral to the front region of the upstream port in the intermediate space and may extend along the intermediate port. The side opposite to the side where the shaft is located with respect to the upstream port may be the opposite side. The central portion of the downstream opening may be located on the opposite axis side from the central portion of the intermediate opening.

According to the above configuration, when the valve body is displaced from the closed position to the open position, the valve body is in a state where the portion on the opposite axis side is the most distant from the upstream port. Therefore, more exhaust gas flows out from the portion on the opposite axis side at the upstream port. On the other hand, in the above configuration, the inclination of the portion of the tapered portion located on the opposite axis side is relatively large. Therefore, the exhaust gas that has flowed into the intermediate space from the portion on the opposite axis side of the upstream port can be smoothly discharged toward the downstream port. Therefore, turbulence and retention of exhaust gas can be suppressed, and as a result, muffler noise is suppressed.

In one aspect of the present disclosure, the case may have a side wall and a bottom. The side wall projects from the partition to the upstream space side. The bottom is provided with an upstream opening and is a wall-shaped portion facing the intermediate opening. The shaft may be located lateral to the front region of the upstream port in the intermediate space and may extend along the intermediate port. The side opposite to the side where the shaft is located with respect to the upstream port may be the opposite side. At least one sub-opening smaller than the upstream port and connecting the upstream space and the intermediate space may be provided on the opposite axis side of the upstream port at the bottom.

According to the above configuration, at least one sub-opening can be arranged at a position away from the opening / closing mechanism such as the shaft of the valve body. Therefore, it is possible to prevent exhaust gas from flowing into the vicinity of the opening / closing mechanism from at least one sub-opening, causing turbulence or retention. As a result, the noise of the muffler is suppressed.

In one aspect of the present disclosure, at least one sub-opening may face the inner wall of the tapered portion along the flow direction.
According to the above configuration, the exhaust gas that has flowed into the intermediate space from at least one sub-opening can be smoothly guided to the tapered portion. Therefore, turbulence and retention of exhaust gas can be suppressed, and as a result, muffler noise is suppressed.

In one aspect of the present disclosure, at least one sub-opening may be located above the lower end of the edge of the upstream opening.
Since the sub-opening is smaller than the upstream port, noise is more likely to occur when the water collected inside the muffler is sucked from the sub-opening than when the water is sucked from the upstream port. On the other hand, according to the above configuration, at least one sub-opening is located above the lower end of the upstream opening. Therefore, the water accumulated inside the muffler is easily sucked from the upstream port, and the water can be suppressed from being sucked by at least one sub-opening. Therefore, the noise of the muffler can be suppressed.

In one aspect of the present disclosure, the upstream outlet may be located below the entrance to the internal space.
According to the above configuration, before the water accumulated inside the muffler enters the entrance to the internal space of the muffler, the water can enter the upstream port and be guided to the downstream space. As a result, the water accumulated inside the muffler can be guided to the downstream side of the exhaust flow path of the vehicle, and as a result, the water can be suitably discharged to the outside.

In one aspect of the present disclosure, the case may have a bottom, side walls, and at least one attachment. The bottom is provided with an upstream opening and is a wall-shaped portion facing the intermediate opening. The side walls are arranged so as to surround the intermediate space and form an opening facing the bottom. The mounting portion projects outward from the edge of the opening on the side wall. At least one mounting portion may be joined to the partition portion.

According to the above configuration, the case portion can be suitably joined to the partition portion.

It is a top view which shows the internal structure of a muffler transparently. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. It is sectional drawing which shows the internal structure of a taper part and a case part transparently. It is a front view of the case part. It is a front view of the taper part.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The embodiments of the present disclosure are not limited to the following embodiments, and various embodiments may be adopted as long as they belong to the technical scope of the present disclosure.

[About the overall configuration]
The muffler 1 of the present embodiment shown in FIG. 1 is provided in an exhaust flow path for flowing down the exhaust gas of the engine of the vehicle. The outer shape of the muffler 1 is, for example, a columnar shape having a substantially rectangular cross section, and the muffler 1 includes an upstream end plate 2, a downstream end plate 3, and a shell 4.

The shell 4 is a tubular portion extending in the front-rear direction and having a substantially rectangular cross section, and forms an outer peripheral surface of the muffler 1.
The upstream end plate 2 and the downstream end plate 3 are plate-shaped portions forming the bottom surface of the muffler 1 and close the openings formed at both ends of the shell 4. The upstream end plate 2 and the downstream end plate 3 face each other in the front-rear direction, the upstream end plate 2 is located on the front side, and the downstream end plate 3 is located on the rear side. Hereinafter, the space surrounded by the shell 4, the upstream end plate 2, and the downstream end plate 3 will be referred to as an internal space 6.

Here, the longitudinal direction of the cross section of the muffler 1 is described as the left-right direction. Further, the muffler 1 is mounted on the vehicle in a state where one of the cross sections in the lateral direction is located on the upper side and the other is located on the lower side. However, the orientation in which the upstream end plate 2 and the downstream end plate 3 of the muffler 1 face each other when mounted on a vehicle is appropriately determined. That is, the front-rear direction and the left-right direction of the muffler 1 mounted on the vehicle do not always match the front-rear direction and the left-right direction of the vehicle.

The upstream end plate 2 has an inlet 2a into which an upstream pipe 2b, which will be described later, is inserted. The inlet 2a is located on the left side of the center of the upstream end plate 2 in the left-right direction. Further, the downstream end plate 3 has an outlet 3a into which the downstream pipe 3b described later is inserted. The outlet 3a is located on the right side of the center of the downstream end plate 3 in the left-right direction.

Further, the muffler 1 further includes a partition portion 5, an upstream pipe 2b, a downstream pipe 3b, a tapered portion 10, a case portion 20, and a valve device 30. Hereinafter, these configurations will be described.
[About the partition]
As shown in FIGS. 1 to 3, the partition portion 5 is a plate-shaped portion that partitions the internal space 6. The partition portion 5 is arranged parallel to or substantially parallel to the upstream end plate 2 and the downstream end plate 3. Therefore, the internal space 6 is divided into an upstream space 6a and a downstream space 6b arranged in the front-rear direction by the partition portion 5. The upstream space 6a is located on the upstream end plate 2 side (in other words, the inlet 2a side), and the downstream space 6b is located on the downstream end plate 3 side (in other words, the outlet 3a side).

The edge of the partition portion 5 is bent forward in an L shape. The partition portion 5 is joined to the inside of the shell 4 via the bent portion.
Further, the partition portion 5 has at least one hole 5b that communicates the intermediate port 12 described later, the upstream pipe port 5a, and the upstream space 6a and the downstream space 6b. The upstream pipe port 5a is located on the left side of the center of the partition portion 5 in the left-right direction. Further, the partition portion 5 is provided with a tapered portion 10 and a case portion 20. The tapered portion 10 and the case portion 20 are located on the right side of the upstream pipe opening 5a.

Further, the upstream pipe 2b is arranged in a state where one end thereof is connected to the inlet 2a and the upstream pipe 2b passes through the upstream pipe opening 5a and penetrates the partition portion 5. The upstream pipe 2b extends in the front-rear direction and crosses the upstream space 6a, and the other end of the upstream pipe 2b reaches the downstream space 6b. That is, the upstream pipe 2b is in a state where the outer peripheral surface is supported by the edge of the upstream pipe port 5a. Further, at least one hole 2c is provided in the portion of the upstream pipe 2b arranged in the upstream space 6a.

[About the taper part]
As shown in FIGS. 1 and 4, the tapered portion 10 is a tubular portion protruding from the edge of the intermediate opening 12 which is an opening provided in the partition portion 5 to the downstream space 6b (in other words, the rear side). .. The tapered portion 10 has a tapered shape and becomes thinner toward the rear side. That is, the area of the cross section of the tapered portion 10 decreases toward the rear side.

Here, in the tapered portion 10, the opening on the downstream space 6b side is referred to as the downstream opening 11. Further, the intermediate port 12 corresponds to an opening on the upstream space 6a side of the tapered portion 10. The intermediate port 12 has a substantially elliptical shape as an example. Further, the downstream port 11 is circular or substantially circular as an example. The tapered portion 10 may be formed by processing a part of the shape of the partition portion 5.

Further, the downstream port 11 of the tapered portion 10 is connected to one end of the downstream pipe 3b. Specifically, an edge portion 13 extending to the rear side is provided on the edge of the downstream port 11, and the edge portion 13 is joined to the downstream pipe 3b. The other end of the downstream pipe 3b is connected to the outlet 3a, and the exhaust gas flowing out from the downstream port 11 is guided to the outlet 3a by the downstream pipe 3b. The other end of the downstream pipe 3b does not reach the outlet 3a and may be arranged in the downstream space 6b. Further, the downstream pipe 3b may not be provided.

[About the case]
As shown in FIGS. 1 and 4, the case portion 20 is provided in the partition portion 5 in a state of projecting toward the upstream space 6a side, and covers the intermediate port 12 of the partition portion 5. Further, the case portion 20 partitions the intermediate space 6c and the upstream space 6a. The intermediate space 6c is a space including the intermediate opening 12, and is formed between the case portion 20 and the tapered portion 10. Further, the case portion 20 has an upstream port 23 which is an opening connecting the intermediate space 6c and the upstream space 6a. The upstream port 23 is circular or substantially circular as an example, and the upstream port 23, the intermediate port 12, and the downstream port 11 are arranged in parallel or substantially parallel.

As shown in FIGS. 4 and 5, the case portion 20 has a side wall 21, a bottom portion 22, and at least one mounting portion 26. In this embodiment, as an example, three mounting portions 26 are provided.

The bottom portion 22 is a wall-shaped portion facing the intermediate opening 12.
The side wall 21 projects from the partition portion 5 toward the upstream space 6a (in other words, the front side). The side wall 21 is arranged along the edge of the intermediate opening 12 and is arranged so as to surround the intermediate opening 12 (in other words, the intermediate space 6c). More specifically, the side wall 21 is arranged so that all parts thereof are located at or near the edge of the intermediate port 12. Not limited to this, the side wall 21 may be entirely or partially arranged inside or outside the edge of the intermediate port 12. In other words, the side wall 21 projects from the edge of the bottom 22 and forms an opening facing the bottom 22.

The mounting portion 26 is a flange-shaped portion that projects outward from the edge of the opening formed by the side wall 21. For example, the case portion 20 is attached to the partition portion 5 by joining the attachment portion 26 to the partition portion 5 by welding.

Further, the bottom portion 22 has the above-mentioned upstream port 23 and at least one sub-opening 25. In this embodiment, as an example, two sub-openings 25 are provided.
The upstream port 23 is arranged so as to face the intermediate port 12. Further, an edge portion 24 is provided on the edge of the upstream port 23. The edge portion 24 is a portion formed by bending the edge of the upstream opening 23 toward the intermediate space 6c in an L shape, and projects from the edge of the upstream opening 23 into the intermediate space 6c.

The sub-opening 25 is an opening connecting the intermediate space 6c and the upstream space 6a, and is smaller than the upstream port 23. Further, each sub-opening 25 is located on the opposite axis side 32a (in other words, the lower left) of the upstream port 23. The non-axis side 32a will be described later.

Further, the sub-opening 25 faces the inner wall of the tapered portion 10 along the front-rear direction. More specifically, the sub-opening 25 faces a portion of the tapered portion 10 having a relatively high degree of inclination with respect to the partition portion 5.

Further, as shown in FIG. 5, one of the two sub-openings 25 in the present embodiment is located above the lowermost portion (hereinafter, the lower end portion) of the upstream opening 23. In addition, all the sub-openings 25 may be located above the lower end portion.

Further, as shown in FIGS. 2 and 3, the upstream port 23 is located below the upstream pipe port 5a of the partition portion 5. Further, the inlet 2a of the upstream end plate 2 faces the upstream pipe opening 5a in the front-rear direction. Therefore, the upstream port 23 is located below the inlet 2a. More specifically, the central portion of the upstream port 23 is located below the central portion of the inlet 2a. The central portion of the upstream port 23 and the inlet 2a may be, for example, the center or the center of gravity of these.

[Valve gear]
As shown in FIGS. 1, 4, and 5, the valve device 30 is arranged inside the case portion 20 (in other words, the intermediate space 6c). The valve device 30 includes a valve body 31, a shaft 32, an urging portion 33, a pedestal portion 34, and a support portion 35.

The pedestal portion 34 is a tubular portion provided on the edge portion 24 of the upstream opening 23. The pedestal portion 34 is a tapered portion protruding from the edge portion 24 toward the intermediate space 6c side (in other words, the rear side), and becomes thinner toward the front side.

The support portion 35 is a portion provided on the upper right of the pedestal portion 34. The valve body 31 is supported by the pedestal portion 34 and the support portion 35. Further, the support portion 35 is provided with a shaft 32 for rotating the valve body 31.

The shaft 32 is located lateral to the front region of the upstream port 23 in the intermediate space 6c (for example, the upper right of the front region) and extends along the intermediate port 12. More specifically, the shaft 32 does not intersect the front region of the upstream port 23 and extends parallel or substantially parallel to the intermediate port 12 and the upstream port 23. Hereinafter, the side on which the shaft 32 is located with reference to the upstream port 23 will be referred to as the shaft side, and the side opposite to the shaft side will be referred to as the anti-shaft side 32a. More specifically, the anti-axis side 32a may be orthogonal to or substantially orthogonal to the axis 32, and may be in a direction from the axis 32 toward the upstream port 23 side in parallel or substantially parallel to the upstream port 23.

The valve body 31 is rotatably supported by a shaft 32 provided at the edge of the valve body 31. The valve body 31 approaches or separates from the pedestal portion 34 by this axial rotation. As a result, the valve body 31 is displaced between the open position 31a and the closed position 31b, and the degree of opening of the upstream port 23 is adjusted by this displacement. When the valve body 31 is located at the open position 31a, the degree of opening of the upstream port 23 is maximized. Further, as the valve body 31 approaches the closed position 31b, the degree of opening of the upstream port 23 decreases. The degree of opening of the upstream port 23 when the valve body 31 is located at the open position 31a and the closed position 31b can be appropriately determined. In the present embodiment, when the valve body 31 is located at the closed position 31b, the upstream port 23 is completely closed. However, when the valve body 31 is located at the closed position 31b, the upstream port 23 may be partially open.

The urging portion 33 urges the valve body 31 so as to displace the valve body 31 toward the closed position 31b. In the present embodiment, the urging portion 33 is configured as a torsion coil spring arranged around the shaft 32 as an example. However, the urging portion 33 may be configured as, for example, a compression coil spring, a tension coil spring, a leaf spring, or the like.

Due to the urging by the urging portion 33, the valve body 31 is normally held at the closed position 31b. However, the valve body 31 is pressed from the upstream space 6a side by the exhaust gas flowing into the muffler 1. Then, when the inflow amount of the exhaust gas to the muffler 1 increases and the force applied by the exhaust gas to the valve body 31 exceeds the force applied to the valve body 31 by the urging portion 33, the valve body 31 moves toward the open position 31a. The upstream port 23 is opened. As a result, the exhaust gas flows from the upstream space 6a to the intermediate space 6c through the upstream port 23.

[About the position of each component]
As shown in FIGS. 5 and 6, the edge of the intermediate port 12 is the edge of the upstream port 23 of the case portion 20 and the valve body 31 projected on the intermediate port 12 (in other words, the tapered portion 10) along the front-rear direction. Located on the outside of the outer edge of. That is, the entire valve body 31 is located in front of the intermediate port 12. In FIG. 6, the valve device 30 is shown by an imaginary line.

Further, as shown in FIGS. 4 and 6, the central portion 11a of the downstream opening 11 projected onto the intermediate opening 12 along the front-rear direction is located on the opposite axis side 32a from the central portion 12a of the intermediate opening 12. The central portion of the downstream port 11 and the intermediate port 12 can be defined in the same manner as the central portion of the upstream port 23 and the inlet 2a described above (in FIG. 4, for convenience, the central axis of the downstream port 11 is 11b and the intermediate port is the intermediate port). The central axis of 12 is indicated by 12b). Therefore, the portion of the tapered portion 10 located in front of the shaft 32 of the valve device 30 and the urging portion 33 and the like has a relatively low degree of inclination with respect to the partition portion 5. The degree of inclination of this portion may be the same as or substantially the same as the degree of inclination of the valve body 31 located at the open position 31a. On the other hand, the portion of the tapered portion 10 located in front of at least one sub-opening 25 of the case portion 20 has a relatively high degree of inclination.

Further, the length of the case portion 20 in the front-rear direction is defined as the case portion thickness 27, and the length of the tapered portion of the tapered portion 10 in the front-rear direction is defined as the taper portion thickness 14. As shown in FIG. 4, as an example, the case portion thickness 27 is larger than the taper portion thickness 14.

[Action]
In the muffler 1 of the above embodiment, when low-pressure exhaust gas flows in from the upstream pipe 2b, a part of the exhaust gas flows into the downstream space 6b from the rear end of the upstream pipe 2b. After that, the exhaust gas flows into the upstream space 6a through at least one hole 5b of the partition portion 5, and further flows into the downstream pipe 3b through the sub-opening 25. Further, a part of the exhaust gas flows into the upstream space 6a from at least one hole 2c of the upstream pipe 2b, and then flows into the downstream pipe 3b from the sub opening 25.

On the other hand, when the high-pressure exhaust gas flows in from the upstream pipe 2b, a part of the exhaust gas flows down the same path as when the low-pressure exhaust gas flows in. In addition to this, a part of the high pressure exhaust gas flows into the downstream space 6b from the rear end of the upstream pipe 2b, and then flows into the upstream space 6a through at least one hole 5b of the partition portion 5. Then, the exhaust gas pushes the valve body 31 to the downstream side, flows into the intermediate space 6c from the upstream port 23, and further flows down to the downstream pipe 3b along the tapered portion 10.

[effect]
(1) According to the above embodiment, due to the positional relationship between the intermediate port 12 and the upstream port 23, a wider space can be secured on the side of the front region of the upstream port 23 in the intermediate space 6c. As a result, even if the opening / closing mechanism of the valve body 31 such as the shaft 32 and the urging portion 33 is arranged on the side of the front region of the upstream port 23, a wider space can be secured in the vicinity of the opening / closing mechanism, and in the vicinity of the opening / closing mechanism. Exhaust turbulence and retention are suppressed.

Further, the tapered portion 10 is inclined so as to become thinner toward the downstream space 6b side. Therefore, for example, even when the intermediate port 12 is open, the exhaust flow can be smoothed in the region on the intermediate port 12 side of the valve body 31 in the intermediate space 6c.

Therefore, the noise of the muffler 1 can be suppressed.
(2) Further, due to the positional relationship between the valve body 31 and the intermediate port 12, a wider space can be secured on the side of the valve body 31 in the intermediate space 6c. As a result, even if the opening / closing mechanism of the valve body 31 is provided at the edge of the valve body 31, a wider space can be secured in the vicinity of the opening / closing mechanism, and turbulence and retention of exhaust gas in the vicinity of the opening / closing mechanism are suppressed.

(3) Further, the side wall 21 of the case portion 20 is arranged along the edge of the intermediate port 12. Therefore, in the intermediate space 6c, a wider space can be secured near the edge of the intermediate port 12, and as a result, a wider space is secured on the side of the front region of the upstream port 23 and on the side of the valve body 31. .. Therefore, turbulence and retention of exhaust gas in the vicinity of the opening / closing mechanism of the valve body 31 can be suppressed.

(4) Further, the case portion thickness 27 is larger than the taper portion thickness 14. Therefore, a wider space is secured on the case portion 20 side in the intermediate space 6c. Therefore, a wider space can be secured near the opening / closing mechanism of the valve body 31. Therefore, in the configuration in which the valve device 30 is housed in the case portion 20, it is possible to reduce the obstruction of the exhaust flow by the valve device 30, and it is possible to suppress the turbulent flow and retention of the exhaust in the vicinity of the opening / closing mechanism of the valve body 31. ..

(5) Further, the tapered portion 10 has a relatively large inclination of the portion located on the opposite axis side 32a. Therefore, in the tapered portion 10, the position of the rear end portion in the inclined portion on the opposite axis side 32a in the front-rear direction and the position of the rear end portion in the inclined portion on the shaft side in the front-rear direction can be matched. Further, at the inclined portion on the opposite axis side 32a, the exhaust gas that has flowed into the intermediate space 6c from the upstream port 23 can be smoothly flowed out toward the downstream port 11. Therefore, turbulence and retention of exhaust gas can be suppressed.

(6) Further, at least one sub-opening 25 is provided on the opposite axis side 32a of the upstream port 23. Therefore, at least one sub-opening 25 can be arranged at a position away from the opening / closing mechanism of the valve body 31. Therefore, it is possible to prevent exhaust gas from flowing into the vicinity of the opening / closing mechanism from at least one sub-opening 25 and causing turbulence or retention.

(7) Further, at least one sub-opening 25 faces the inner wall of the tapered portion 10 along the front-rear direction. Therefore, the exhaust gas that has flowed into the intermediate space 6c from at least one sub-opening 25 can be smoothly guided to the tapered portion 10. Therefore, turbulence and retention of exhaust gas can be suppressed.

(8) Further, at least one sub-opening 25 is located above the lower end of the edge of the upstream port 23. Therefore, the water accumulated inside the muffler 1 is easily sucked from the upstream port 23, and the water can be suppressed from being sucked by at least one sub-opening 25. Therefore, the noise of the muffler 1 can be suppressed.

(9) Further, the upstream port 23 is located below the entrance 2a. Therefore, before the water accumulated inside the muffler 1 enters the inlet 2a, the water can enter the upstream port 23 and be guided to the downstream space 6b. As a result, the water accumulated inside the muffler 1 can be guided to the downstream side of the exhaust flow path of the vehicle, and as a result, the water can be suitably discharged to the outside.

(10) Further, the case portion 20 is joined to the partition portion 5 by three mounting portions 26. Therefore, the case portion 20 can be suitably joined to the partition portion 5.
[Other Embodiments]
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.

[Correspondence with claims]
The front-back direction in the above embodiment corresponds to an example of the flow direction. Further, the tapered portion of the tapered portion 10 corresponds to an example of the tapered portion.

1 ... muffler, 2a ... entrance, 3a ... exit, 4 ... shell, 5 ... partition, 6 ... internal space, 6a ... upstream space, 6b ... downstream space, 6c ... intermediate space, 10 ... taper part, 11 ... downstream exit , 11a ... Central part, 12 ... Intermediate port, 12a ... Central part, 14 ... Tapered part thickness, 20 ... Case part, 21 ... Side wall, 22 ... Bottom part, 23 ... Upstream port, 25 ... Sub opening, 26 ... Mounting part , 27 ... Case thickness, 30 ... Valve device, 31 ... Valve body, 31a ... Open position, 31b ... Closed position, 32 ... Shaft, 32a ... Anti-axis side, 33 ... Biasing part.

Claims (11)

It is a muffler that is mounted on the vehicle and allows the exhaust from the engine to flow down.
A plate-shaped portion that divides the internal space of the muffler into an upstream space and a downstream space arranged in the flow direction, and the upstream space is a space on the inlet side of the exhaust gas in the muffler, and the downstream space and the downstream space. Is a partition portion which is a space on the outlet side of the exhaust in the muffler, and
A tapered portion that is a tubular portion that protrudes into the downstream space from the edge of an intermediate opening that is an opening provided in the partition portion and that is a tapered portion that becomes thinner toward the downstream space side.
An opening that projects from the partition portion into the upstream space, covers the intermediate port, partitions the intermediate space and the upstream space, which is a space including the intermediate port, and connects the intermediate space and the upstream space. The case part, which is the part that has the upstream mouth,
It is a portion that is arranged in the intermediate space and rotates about an axis to displace between the closed position and the open position to adjust the degree of opening of the upstream port, and the upstream side toward the closed position. The valve body, which is the part that reduces the degree of opening of the mouth,
An urging portion for urging the valve body so that the valve body is displaced toward the closed position is provided.
The case part
A side wall that is a portion that protrudes from the partition portion toward the upstream space side and is a portion that is arranged along the edge of the intermediate opening and surrounds the intermediate opening.
The bottom, which is a wall-shaped portion facing the intermediate port, is provided with the upstream port, and
Muffler with. The muffler according to claim 1.
When the valve body is projected onto the intermediate port along the flow direction, the edge of the intermediate port is a muffler located outside the outer edge of the valve body. In the muffler according to claim 1 or 2 .
The opening on the downstream space side in the tapered portion is defined as a downstream opening.
The shaft is located lateral to the front region of the upstream port in the intermediate space and extends along the intermediate port.
The side opposite to the side on which the shaft is located with respect to the upstream port is defined as the opposite side.
The central portion of the downstream opening is a muffler located on the opposite axis side of the central portion of the intermediate opening. It is a muffler that is mounted on the vehicle and allows the exhaust from the engine to flow down.
It is a plate-shaped portion that divides the internal space of the muffler into an upstream space and a downstream space arranged in the flow direction, and the upstream space is a space on the inlet side of the exhaust in the muffler, and the downstream space and the downstream space. Is a partition portion which is a space on the outlet side of the exhaust in the muffler, and
A tapered portion that is a tubular portion that protrudes into the downstream space from the edge of an intermediate opening that is an opening provided in the partition portion and that is a tapered portion that becomes thinner toward the downstream space side.
An opening that projects from the partition portion into the upstream space, covers the intermediate port, partitions the intermediate space and the upstream space, which is a space including the intermediate port, and connects the intermediate space and the upstream space. The case part, which is the part that has the upstream mouth,
It is a portion that is arranged in the intermediate space and rotates about an axis to displace between the closed position and the open position to adjust the degree of opening of the upstream port, and the upstream side toward the closed position. The valve body, which is the part that reduces the degree of opening of the mouth,
An urging portion for urging the valve body so that the valve body is displaced toward the closed position is provided.
When the valve body is projected onto the intermediate port along the flow direction, the edge of the intermediate port is located outside the outer edge of the valve body.
The opening on the downstream space side in the tapered portion is defined as a downstream opening.
The shaft is located lateral to the front region of the upstream port in the intermediate space and extends along the intermediate port.
The side opposite to the side where the shaft is located with respect to the upstream port is defined as the anti-axis side.
The central portion of the downstream opening is a muffler located on the opposite axis side of the central portion of the intermediate opening . In the muffler according to any one of claims 1 to 4.
When the upstream port is projected onto the intermediate port along the flow direction, the edge of the intermediate port is located outside the edge of the upstream port.
Muffler. In the muffler according to any one of claims 1 to 5 .
A muffler whose length in the flow direction in the case portion is larger than the length in the flow direction in the tapered portion. In the muffler according to any one of claims 1 to 6 .
The case part
A side wall protruding from the partition to the upstream space side,
The bottom, which is a wall-shaped portion facing the intermediate port, is provided with the upstream port, and
Have,
The shaft is located lateral to the front region of the upstream port in the intermediate space and extends along the intermediate port.
The side opposite to the side where the shaft is located with respect to the upstream port is defined as the anti-axis side.
A muffler having at least one sub-opening smaller than the upstream port and connecting the upstream space and the intermediate space on the opposite axis side of the upstream port at the bottom. In the muffler according to claim 7 .
The at least one sub-opening is a muffler facing the inner wall of the tapered portion along the flow direction. In the muffler according to claim 7 or 8 .
The at least one sub-opening is a muffler located above the lower end of the edge of the upstream opening. In the muffler according to any one of claims 1 to 9 .
The upstream port is a muffler located below the entrance to the internal space. In the muffler according to any one of claims 1 to 10 .
The case part
The bottom, which is a wall-shaped portion facing the intermediate port, is provided with the upstream port, and
A side wall that is arranged so as to surround the intermediate space and forms an opening facing the bottom,
It has at least one mounting portion that projects outward from the edge of the opening in the sidewall.
A muffler in which the at least one mounting portion is joined to the partition portion.

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