JP2011069251A - Exhaust system valve - Google Patents

Abstract

In an exhaust system valve in which a valve body is rotated around a support shaft provided on one side thereof, a hitting sound generated when the valve body is seated on a valve seat via a cushioning material is reduced.
A valve seat 22 provided around an opening 10A from which exhaust gas is discharged, a wire mesh 25 provided on a seat surface 22a of the valve seat 22, and a support shaft 23 provided on one side. And a valve body 21 that moves to open and close the opening 10A. When the valve body 21 is seated on the valve seat 22 via the wire mesh 25, the wire mesh 25 is supported so that the valve body 21 comes into contact first from the portion 25 a close to the support shaft 23 of the wire mesh 25. A portion 25a close to the shaft 23 is formed thicker than the other portions.
[Selection] Figure 3

Description

  The present invention relates to an exhaust system valve provided in an exhaust system of an internal combustion engine. In particular, the present invention relates to a technique for suppressing a hitting sound generated when a valve body is seated on a valve seat via a cushioning material.

  A valve may be provided in the exhaust system of the internal combustion engine for the purpose of switching the flow path of the exhaust gas of the internal combustion engine or controlling the flow rate of the exhaust gas.

  For example, Patent Document 1 discloses a valve provided in an exhaust heat recovery unit of an internal combustion engine. The exhaust heat recovery device disclosed in Patent Document 1 bypasses the exhaust gas that has entered the exhaust heat recovery device by closing the valve to the heat exchange unit, and the exhaust gas that has entered the exhaust heat recovery device by opening the valve. The gas is discharged downstream without bypassing to the heat exchanger.

  The valve of this exhaust heat recovery device is provided at the downstream end of the inner pipe connected to the upstream exhaust pipe, and is composed of a valve seat, a valve body, a buffer material, a support shaft, and the like. The valve seat is provided around the downstream end opening of the inner pipe, and a cushioning material is attached to the seat surface of the valve seat. A heat resistant material such as a wire mesh is used as the buffer material. The valve body is rotatable around a support shaft provided on one side thereof, and is urged to rotate to the closed side by a torsion coil spring wound around the support shaft. Further, the valve body is rotated to the open side by driving an actuator.

  In addition to the exhaust heat recovery valve, exhaust system valves as disclosed in Patent Documents 2 to 4 are known.

  In the exhaust system valves disclosed in Patent Documents 2 to 4, a valve seat is provided around the opening end of a pipe disposed in the muffler or the opening of a partition wall disposed in the muffler, and the opening is opened. The valve body to be opened and closed is rotatable around a support shaft provided near one side of the valve seat. A torsion coil spring is provided around the support shaft, and the torsion coil spring urges the valve body to rotate toward the closing side.

  In this exhaust system valve, when the exhaust gas pressure in the muffler increases, the valve body is pressed by the gas pressure and rotates to the open side against the rotational biasing force of the torsion coil spring, and the opening of the pipe Open the end and the opening of the partition. On the other hand, when the exhaust gas pressure in the muffler falls below a certain pressure, the valve body is turned to the closing side by the rotational biasing force of the torsion coil spring, and closes the opening end of the pipe and the opening of the partition wall.

JP 2009-13960 A Japanese Patent No. 2892160 JP 2004-285936 A JP 2006-291719 A

  By the way, in a valve of a type in which a support shaft is provided on one side of the valve body and the valve body rotates around the support shaft as in the exhaust system valves disclosed in Patent Documents 1 to 4, the valve body is buffered. When seated on the valve seat through the material, a loud sound may be generated. The hitting sound generated when the valve body is seated on the valve seat via the cushioning material as described above may give an uncomfortable feeling and an uncomfortable feeling to a vehicle occupant mounted with the exhaust system valve.

  The present invention has been made in view of the above problems, and in an exhaust system valve in which a valve body rotates around a support shaft provided on one side thereof, the valve body is seated on the valve seat via a cushioning material. It is an object of the present invention to provide an exhaust system valve that can suppress the hitting sound generated during the operation.

  As means for solving the above-described problems, the exhaust system valve of the present invention is configured as follows.

  That is, the exhaust system valve of the present invention rotates around a support shaft provided on one side, a valve seat provided around the opening, a cushioning material provided on the seat surface of the valve seat, and And a valve body that opens and closes the opening, and when the valve body is seated on the valve seat via the cushioning material, the valve body is from a portion near the support shaft of the cushioning material. The shapes and dimensions of the valve seat, the cushioning material, and the valve body are set so as to abut first.

  Specifically, when the valve body is seated on the valve seat via the cushioning material, the cushioning material is such that the valve body abuts first from a portion near the support shaft of the cushioning material, A portion close to the support shaft is formed thicker than the other portions.

  Alternatively, when the valve body is seated on the valve seat via the cushioning material, the valve body is configured so that the valve body first comes into contact with a portion of the cushioning material that is close to the support shaft. A portion close to the support shaft among the portions in contact with the base may protrude from the other portions toward the cushioning material.

  Alternatively, when the valve body is seated on the valve seat via the cushioning material, the valve seat is configured so that the valve body first comes into contact with a portion of the cushioning material that is close to the pivot shaft. The part close to may protrude from the other part to the valve body side.

  According to the exhaust system valve having the above-described configuration, the portion close to the support shaft of the valve body rotates at a relatively low speed, so the valve body (portion close to the support shaft of the valve body) is the support shaft of the cushioning material. Since the angular velocity of the valve body decreases rapidly immediately after that, the other part of the valve body (the part far from the support shaft of the valve body) is also slow relative to the cushioning material. It will be a hit. In other words, according to this exhaust system valve, the valve body comes into contact with any part of the buffer material at a low speed, and the hitting sound generated when the valve body comes into contact with the buffer material can be suppressed to a low level. .

  In addition, it is desirable that the buffer material is formed so that a portion close to the support shaft is thicker than other portions and has a low density.

  Or the said buffer material may be formed in the part which contact | abuts the part which the said valve body protruded in the lower density than other parts.

  Alternatively, the buffer material may be formed such that a portion attached to the protruding portion of the valve seat has a lower density than other portions.

  According to the exhaust system valve having such a configuration, the portion where the density of the buffer material is low becomes more flexible and absorbs the shock easily, so that the hitting sound generated when the valve body starts to contact the buffer material is suppressed to a low level. be able to.

  According to the exhaust system valve of the present invention, it is possible to suppress the hitting sound generated when the valve body comes into contact with the buffer material.

It is sectional drawing of the exhaust heat recovery device provided with the exhaust system valve | bulb which concerns on embodiment of this invention. It is AA sectional drawing of FIG. FIG. 2 is a partial enlarged view of FIG. 1 and is a cross-sectional view for explaining a contact operation between a valve body and a wire mesh in the exhaust system valve according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and is a diagram in which the valve body of the exhaust system valve according to the first embodiment of the present invention is omitted. It is a graph which shows the thickness of a wire mesh. The horizontal axis indicates the central angle with respect to the perpendicular line from the center of the wire mesh to the support shaft, and the vertical axis indicates the thickness of the wire mesh according to the central angle. It is AA sectional drawing of FIG. 1, Comprising: It is related with the exhaust system valve | bulb which concerns on the 2nd Embodiment of this invention. FIG. 5 is a partially enlarged view of FIG. 1, and is a cross-sectional view for explaining a contact operation between a valve body and a wire mesh in an exhaust system valve according to a second embodiment of the present invention. It is a graph which shows the protrusion amount of a part of valve body concerning a 2nd embodiment of the present invention. The horizontal axis indicates the central angle based on the perpendicular line from the center of the valve body to the support shaft, and the vertical axis indicates the amount of protrusion of the valve body in accordance with the center angle. FIG. 5 is a partial enlarged view of FIG. 1 and is a cross-sectional view for explaining a contact operation between a valve body and a wire mesh in an exhaust system valve according to a third embodiment of the present invention. It is a graph which shows the protrusion amount of a part of valve seat which concerns on the 3rd Embodiment of this invention. The horizontal axis indicates the central angle with respect to the perpendicular line from the center of the valve seat to the support shaft, and the vertical axis indicates the amount of protrusion of the valve seat according to the central angle. FIG. 9 is a partial enlarged view of FIG. 1 and is a cross-sectional view for explaining a contact operation between a valve element and a wire mesh in an exhaust system valve according to a fourth embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 and relates to an exhaust system valve according to a fourth embodiment of the present invention. FIG. 10 is a partially enlarged view of FIG. 1 and is a cross-sectional view for explaining a contact operation between a valve element and a wire mesh in an exhaust system valve according to a fifth embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5 show an exhaust heat recovery device 100 equipped with an exhaust system valve of the present invention. The exhaust heat recovery device 100 is installed as a part of an exhaust system such as an automobile engine.

<Explanation of exhaust heat recovery device>
The exhaust heat recovery device 100 is mainly composed of an inner cylinder part 10, an exhaust system valve 20, a heat exchange part 30, an outer cylinder part 40, and the like.

  Both ends of the inner cylinder portion 10 are open and are connected to an upstream exhaust pipe and a downstream exhaust pipe (not shown), respectively. The opening on the downstream side of the inner cylinder portion 10 is opened and closed by a valve body 21 described later. On the peripheral side surface of the inner cylinder portion 10, a large number of communication holes 11 that communicate the inner and outer spaces of the inner cylinder portion 10 are formed. In addition, the inner cylinder part 10 shown in FIG. 1 is comprised from the some pipe material.

  The exhaust system valve 20 is provided at the downstream end of the inner cylinder part 10. The exhaust system valve 20 includes a valve seat 22, a valve body 21, a support shaft 23, a buffer material 25, and the like.

  The valve seat 22 is annularly provided around the downstream end opening of the inner cylinder portion 10. The valve seat 22 has a tapered shape whose diameter is increased from the upstream side toward the downstream side. An annular cushioning material 25 is attached to the seat surface 22 a of the valve seat 22. As the buffer material 25, for example, a mat-shaped member (hereinafter referred to as “wire mesh 25”) obtained by compressing a heat-resistant stainless steel wire mesh is used. The wire mesh 25 is attached to the seat surface 22a of the valve seat 22 by spot welding.

  The valve body 21 rotates around the support shaft 23 installed on one side thereof to open and close the downstream end opening 10A of the inner cylinder portion 10. The valve body 21 has an arm portion 21a extending to one side, and the arm portion 21a is fixed to a support shaft 23 provided on one side of the valve body with a screw 26.

  As shown in FIG. 2, the support shaft 23 is rotatably supported by bearings 42, 42 fixed to the outer cylinder portion 40. Further, one end side of the support shaft 23 is exposed to the outside through the wall surface of the outer cylinder portion 6, and a torsion coil that urges the support shaft to rotate around the exposed portion in a direction in which the valve body 21 is closed. A spring 27 (hereinafter simply referred to as “spring 27”) is provided. One end of the spring 27 is engaged with a spring engaging portion 28 fixed to the outer cylinder portion 40, and the other end of the spring 27 is fixed to a spring engaging portion 29 fixed to the tip of the exposed portion of the support shaft 23. Is engaged.

  In addition, an actuator adapter 51 extending radially outward is provided at one end of the support shaft 23, and the telescopic rod 52 of the actuator presses the actuator adapter 51 to one side, so that the support shaft 23 is It can be turned to the open side.

  As the heat exchange unit 30, an inner cooling water channel 31 and an outer cooling water channel 32, an inner exhaust gas channel 33 and an outer exhaust gas channel 34 are provided. The inner cooling water channel 31 and the outer cooling water channel 32 are communicated with each other by a communication portion 35, and further, a cooling water introduction pipe (not shown) for introducing cooling water is connected to the cooling water channels 31 and 32. Further, a cooling water discharge pipe 46 for discharging the heated cooling water is connected to the outer cooling water channel 32.

  The outer cylinder portion 40 extends further downstream than the exhaust system valve 20 and is connected to an exhaust pipe on the downstream side of the exhaust heat recovery device 1.

  As shown in FIG. 1, the upstream end portion of the outer cylinder portion 40 and the outer peripheral surface of the inner cylinder portion 10 are closed by a closing member 44, and the downstream end portion of the inner cylinder portion 10 and the inner cooling portion are closed. A portion between the downstream end portions of the members forming the water flow path 31 is also closed by the closing member 45. As a result, the exhaust gas introduced from the inner pipe 10 into the inner exhaust gas flow path 33 through the communication hole 11 is introduced into the heat exchange unit 30.

  In the exhaust heat recovery device 100 having the above-described configuration, when the telescopic rod 52 of the actuator extends, the tip of the telescopic rod 52 presses the actuator adapter 51 and resists the rotational biasing force of the spring 27 and the support shaft 23 and The valve body 21 is rotated to the open side. As a result, the downstream end opening 10A (hereinafter also simply referred to as “opening 10A”) of the inner cylinder portion 10 is opened, and much of the exhaust gas that has entered the inner cylinder portion 10 from the upstream side of the exhaust heat recovery device 100. Passes through the inner cylinder part 10 without passing through the heat exchange part 30, and is discharged downstream of the exhaust heat recovery unit 100.

  On the other hand, when the telescopic rod 52 of the actuator contracts, the rotation biasing force of the spring 27 rotates the support shaft 23 and the valve body 21 to close the opening 10A. At this time, most of the exhaust gas that has entered the inner cylinder part 10 from the upstream side of the exhaust heat recovery unit 100 passes through the heat exchange part 30 and performs heat exchange with the cooling water, and then exhaust heat recovery. Discharged downstream of the vessel 100.

[First Embodiment]
Hereinafter, the exhaust system bubble 20 according to the first embodiment of the present invention will be described with reference to FIGS.

  When the valve body 21 is seated on the valve seat 22 via the wire mesh 25, the exhaust system valve 20 is configured so that the valve body 21 comes into contact with the first portion from the portion near the support shaft 23 of the wire mesh 25. The shapes and dimensions of the valve seat 22 and the wire mesh 25 are set.

  Specifically, a portion 25a near the support shaft 23 of the wire mesh 25 is formed thicker than the other portions. However, the contact surface 21b of the valve body 21 and the seat surface 22a of the valve seat 22 are flat in the circumferential direction. The density of the wire mesh 25 is uniform throughout.

  FIG. 5A shows the thickness of the wire mesh 25 at the circumferential position. The horizontal axis indicates the central angle θ (see FIG. 4) with respect to the perpendicular V drawn from the center of the wire mesh 25 to the support shaft 23, and the vertical axis indicates the thickness of the wire mesh 25 corresponding to the central angle θ. Yes. As shown in FIG. 5 (a), the thickness of the portion 25a (range of the central angle 0 ° to 45 °, 315 ° to 360 °) close to the support shaft 23 of the wire mesh 25 is T1, and the other portions. The thickness of the central angle (45 ° to 315 °) is T2 which is thinner than T1.

  According to the exhaust system valve 20 configured as described above, the valve body 21 in the open position rotates to the closed side around the support shaft 23 by the rotational biasing force of the spring 27 (see FIG. 3A). When seating on the valve seat 22 via the wire mesh 25, the portion close to the support shaft 23 of the wire mesh 25 is first contacted (see FIG. 3B), and then the entire wire mesh 25 is contacted. (See FIG. 3 (c)).

  When the valve body 21 rotates around the support shaft 23, the portion close to the support shaft 23 of the valve body 21 has a speed (= rotation radius × angular speed) compared to other portions (portions far from the support shaft 23, etc.). Therefore, the speed at which the valve body 21 (the portion near the support shaft 23 of the valve body 21) first hits the portion 25a of the wire mesh 25 near the support shaft 23 is low. Furthermore, since the angular velocity of the valve body 21 decreases rapidly immediately after the valve body 21 hits the portion 25a of the wire mesh 25 close to the support shaft 23, the valve body 21 is connected to other parts of the wire mesh 25 (valve body). The portion 21 far from the support shaft 23) also hits at a low speed.

  As described above, according to the exhaust system valve 20 according to the present embodiment, the valve body 21 comes into contact with any part of the wire mesh 25 at a low speed. The hitting sound generated when touching can be reduced.

  As a modification of the first embodiment described above, the density of the portion 25a close to the support shaft 23 of the wire mesh 25 may be lower than the density of other portions. By doing so, the flexibility of the portion 25a close to the support shaft 23 of the wire mesh 25 is increased (the hardness specific to the metal material is reduced), and the valve body 21 is first close to the support shaft 23 of the wire mesh 25. The hitting sound generated at the moment of hitting the portion 25a can be further suppressed.

  As yet another modification, the thickness of the wire mesh 25 may be as shown in FIG. That is, the thickness of the wire mesh 25 may be gradually reduced from a portion close to the support shaft 23 (center angle 0 °) to a portion farther than the support shaft 23 (center angle 180 °).

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. In addition, about the structure similar to the exhaust system valve | bulb 20 in 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  Also in the exhaust system valve 20A according to the present embodiment, when the valve body 21A is seated on the valve seat 22 via the wire mesh 25A, the valve body 21A comes into contact first from a portion close to the support shaft 23 of the wire mesh 25A. In addition, the shapes and dimensions of the valve body 21A, the valve seat 22, and the wire mesh 25A are set.

  Specifically, a portion 21Ab close to the support shaft 23 of the portion of the valve body 21A that contacts the wire mesh 25A protrudes from the other portion to the wire mesh 25A side (valve seat 22 side). However, the thickness of the wire mesh 25A is uniform in the circumferential direction, and the seat surface 22a of the valve seat 22 is flat in the circumferential direction.

  FIG. 8A shows the protruding amount of the portion 21Ab close to the support shaft 23 relative to the other portion of the portion of the valve body 21A that contacts the wire mesh 25A. The horizontal axis indicates the central angle θ (see FIG. 6) with respect to the perpendicular V drawn from the center of the wire mesh 25 to the support shaft 23, and the vertical axis indicates the amount of protrusion. As shown in FIG. 8A, the portion 21Ab (center angle of 0 ° to 45 °, the range of 315 ° to 360 °) close to the support shaft 23 in the portion of the valve body 21A that contacts the wire mesh 25A. The protrusion amount with respect to the other portions (center angles 45 ° to 315 °) is P.

  According to the exhaust system valve 20A configured as described above, the valve body 21A in the open position rotates around the support shaft 23 to the closed side by the rotational biasing force of the spring 27 (see FIG. 7A). When seating on the valve seat 22 via the wire mesh 25A, the portion close to the support shaft 23 of the wire mesh 25A is first contacted (see FIG. 7B), and then the entire wire mesh 25A is contacted. (Refer to FIG. 7C).

  That is, also in the exhaust system valve 20A according to the present embodiment, when the valve body 21A is seated on the valve seat 22 via the wire mesh 25A, the valve body 21A is connected to the wire mesh 25A as in the first embodiment. The portion close to the support shaft 23 contacts first. For this reason, the valve body 21A comes into contact with any part of the wire mesh 25A at a low speed, and the hitting sound generated when the valve body 21A comes into contact with the wire mesh 25A is reduced.

  As a modification of the second embodiment described above, the density of the portion of the wire mesh 25A that contacts the protruding portion 21Ab of the valve body 21A may be lower than the density of the other portions. Thereby, the hitting sound generated at the moment when the protruding portion 21Ab of the valve body 21A first hits the portion close to the support shaft 23 of the wire mesh 25A can be further suppressed.

  As yet another modification, the protruding amount of the protruding portion 21Ab of the valve body 21A with respect to other portions may be as shown in FIG. That is, the protruding amount may be gradually decreased from a portion close to the support shaft 23 (center angle 0 °) to a portion farther than the support shaft 23 (center angle 180 °).

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG. In addition, about the structure similar to the exhaust system valve | bulb 20 in 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  Also in the exhaust system valve 20B according to the present embodiment, when the valve body 21 is seated on the valve seat 22A via the wire mesh 25A, the valve body 21 comes into contact first from a portion close to the support shaft 23 of the wire mesh 25A. Further, the shapes and dimensions of the valve body 21, the valve seat 22A, and the wire mesh 25A are set.

  Specifically, a portion 22Ab near the support shaft 23 of the valve seat 22A protrudes toward the valve body 21 from the other portions. However, the contact surface 21b of the valve body 21 has a flat shape in the circumferential direction, and the thickness of the wire mesh 25A is uniform in the circumferential direction.

  FIG. 10A shows the protruding amount of the portion 22Ab near the support shaft 23 of the valve seat 22A with respect to the other portions. The horizontal axis is the same as the previously described central angle θ, and the vertical axis indicates the amount of protrusion. As shown in FIG. 10A, the other portion (center angle 45 ° to 315) of the portion 22Ab (center angle 0 ° to 45 °, range of 315 ° to 360 °) close to the support shaft 23 of the valve seat 22A. Projection amount with respect to °) is S.

  According to the exhaust system valve 20B configured as described above, the portion 22Ab close to the support shaft 23 of the valve seat 22A protrudes toward the valve body 21 from the other portion. A close portion also protrudes toward the valve body 21 side.

  For this reason, the valve body 21 in the open position rotates to the closed side around the support shaft 23 by the rotational biasing force of the spring 27 (see FIG. 9A), and is seated on the valve seat 22A via the wire mesh 25A. In doing so, the portion close to the support shaft 23 of the wire mesh 25A contacts first (see FIG. 9B), and then contacts the entire wire mesh 25A (see FIG. 9C).

  That is, also in the exhaust system valve 20B according to the present embodiment, when the valve body 21 is seated on the valve seat 22A via the wire mesh 25A, the valve body 21 is connected to the wire mesh 25A as in the first embodiment. The portion close to the support shaft 23 contacts first. As a result, the valve body 21 comes into contact with any part of the wire mesh 25A at a low speed, and the hitting sound generated when the valve body 21 contacts the wire mesh 25A is reduced.

  As a modification of the third embodiment described above, the density of the portion attached to the protruding portion 22Ab of the valve seat 22A of the wire mesh 25A may be lower than the density of the other portions. Thereby, it is possible to further suppress the hitting sound generated at the moment when the valve body 21 first hits the portion close to the support shaft 23 of the wire mesh 25A.

  As yet another modification, the protrusion amount of the portion 22Ab close to the support shaft 23 of the valve seat 22A with respect to the other portion may be as shown in FIG. That is, the protruding dormitory may be gradually reduced from a portion close to the support shaft 23 (center angle 0 °) to a portion farther than the support shaft 23 (center angle 180 °).

[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS. 11 and 12. In addition, about the structure similar to the exhaust system valve | bulb 20 which concerns on 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the exhaust system valve 20C according to the present embodiment, a portion 25Ba far from the support shaft 23 of the wire mesh 25B (a constant portion 25Ba farthest from the support shaft 23) is formed thicker than the other portions. For example, as shown in FIG. 12, the thickness of the wire mesh 25B is T1 when the central angle θ is in the range of 135 ° to 225 ° with respect to the perpendicular V drawn from the center of the wire mesh 25B to the support shaft 23. In other ranges, the thickness of the wire mesh 25B is T2 which is thinner than T1. In the present embodiment, a graph indicating the thickness of the wire mesh 25B is omitted.

  According to the exhaust system valve 20C configured in this way, the valve body 21 in the open position rotates around the support shaft 23 by the rotational biasing force of the spring 27 (see FIG. 11A). When seated on the valve seat 22 via the wire mesh 25B, the wire mesh 25B first comes into contact with the portion 25Ba farther from the support shaft 23 (see FIG. 11B), and then the entire wire mesh 25B. Abut (see FIG. 11C).

  Although the valve body 21 comes into contact first from a portion 25Ba farther from the support shaft 23 of the wire mesh 25B (see FIG. 11B), the portion 25Ba is formed to be relatively thick and has a crushing allowance (deflection). Therefore, a relatively large amount of energy can be absorbed. That is, the high kinetic energy portion of the valve body 21 can be efficiently absorbed as deformation energy or heat energy of the wire mesh 25B, and the ratio of radiation as sound energy can be reduced. That is, the generated hitting sound can be reduced.

  Of course, if the wire mesh is thickened over the entire circumference, it is possible to further suppress the hitting sound when the valve body 21 comes into contact with the wire mesh. However, doing so results in an increase in the weight and cost of the wire mesh. In the invention according to this embodiment, only a part of the wire mesh 25B with which the valve element 21 hits at a relatively high speed is thickened, thereby suppressing an increase in the weight and cost of the wire mesh and efficiently suppressing the hitting sound. It is possible to do.

  As a modification of the fourth embodiment described above, the portion 25Ba far from the support shaft 23 of the wire mesh 25B is formed thicker than the other portions, and the density of the thickly formed portion is made lower than the other portions. Good. As a result, the flexibility of the portion 25Ba farther from the support shaft 23 of the wire mesh 25B is increased, and the hitting sound generated at the moment when the valve body 21 first hits the wire mesh 25B can be further suppressed.

  Even if the thickness of the portion 25Ba far from the support shaft 23 of the wire mesh 25B is made the same as the thickness of the other portion, and the density of the portion 25Ba is lower than the density of the other portion, a certain sound reduction effect can be obtained. can get.

[Fifth Embodiment]
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. In addition, about the structure similar to the exhaust system valve | bulb 20C which concerns on 4th Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the exhaust system valve 20D according to the present embodiment, a portion 22Daa farthest from the support shaft 23 of the seat surface 22Da of the valve seat 22D is recessed to the opposite side to the valve body 21, and the amount of the depression and the thickness of the wire mesh 25B The amount of increase is about the same. That is, the seat surface 22Da of the valve seat 22D is recessed by the thickness variation (T1-T2) of the wire mesh 25B in the range where the central angle θ is 135 ° to 225 ° compared to other ranges.

  According to the exhaust system valve 20D configured as described above, the valve body 21 in the open position rotates around the support shaft 23 by the rotational biasing force of the spring 27 (see FIG. 13A). When seated on the valve seat 22D via the wire mesh 25B, it abuts almost simultaneously on the entire circumference of the wire mesh 25B (see FIG. 13B), and then abuts on the entire wire mesh 25B (see FIG. 13). 13 (c)).

  As a result, the high kinetic energy portion of the valve body 21 can be efficiently absorbed by the wire mesh 25B, and the high kinetic energy portion (high speed portion) of the valve body 21 first hits the wire mesh 25D. And the hitting sound generated when the valve body 21 first hits the wire mesh 25B can be suppressed.

[Modification]
The cross-sectional shape of the wire mesh is not limited to the illustrated rectangle, and various cross-sectional shapes such as a circle, an ellipse, and a triangle can be employed.

  In the above-described embodiment, the wire mesh is continuously provided in the circumferential direction, but it is not necessarily provided continuously in the circumferential direction, and may be provided intermittently in the circumferential direction.

  The seating surfaces of the valve body and the valve seat are not limited to the tapered shape described above, and may be flat surfaces, for example.

[Applicable range of exhaust system valve of the present invention]
The exhaust system bubble of the present invention is not limited to a valve of an exhaust heat recovery device, and can be applied to various valves provided in an exhaust system such as a valve provided in a muffler and a valve provided in a catalytic converter.

  The present invention can be applied to, for example, a valve provided for opening and closing an exhaust gas passage of an automobile engine.

10A Opening portion 20, 20A, 20B Exhaust system valve 21, 21A Valve body 21Ab Part close to support shaft 22, 22A Valve seat 22Ab Part close to support shaft 22a, 22Ab Seat surface of valve seat 25, 25A Wire mesh (buffer material)
25a A portion close to the support shaft 23 Support shaft

Claims (7)

A valve seat provided around the opening, a cushioning material provided on a seating surface of the valve seat, and a valve body that rotates around a support shaft provided on one side to open and close the opening. In the exhaust system valve provided,
When the valve body is seated on the valve seat via the cushioning material, the valve seat, the cushioning material, and the valve are arranged so that the valve body first comes into contact with a portion of the cushioning material close to the support shaft. An exhaust system valve characterized by the body shape and dimensions being set. The exhaust system valve according to claim 1,
When the valve body is seated on the valve seat via the cushioning material, the cushioning material is close to the support shaft so that the valve body first comes into contact with a portion of the cushioning material that is close to the support shaft. An exhaust system valve characterized in that the portion is formed thicker than the other portions. The exhaust system valve according to claim 1,
When the valve body is seated on the valve seat via the cushioning material, the valve body contacts the cushioning material so that the valve body first comes into contact with a portion of the cushioning material close to the support shaft. An exhaust system valve characterized in that a portion of the contacting portion that is close to the support shaft protrudes toward the cushioning material from the other portion. The exhaust system valve according to claim 1,
When the valve body is seated on the valve seat via the cushioning material, the valve seat is close to the support shaft so that the valve body first comes into contact with a portion of the cushioning material that is close to the support shaft. An exhaust system valve characterized in that the portion protrudes from the other portion toward the valve body. The exhaust system valve according to claim 2,
The exhaust system valve according to claim 1, wherein the buffer material is formed such that a portion close to the support shaft is thicker and has a lower density than other portions. The exhaust system valve according to claim 3,
The exhaust system valve according to claim 1, wherein a portion of the cushioning material that contacts the protruding portion of the valve body is formed at a lower density than other portions. The exhaust system valve according to claim 4,
The exhaust system valve according to claim 1, wherein the cushioning material is formed such that a portion attached to the protruding portion of the valve seat has a lower density than other portions.

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