JP2006291719A - Valve for controlled muffler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve for a controlled muffler excellent in buffering performance and sealing performance and capable of reducing weight and cost. <P>SOLUTION: This valve is provided with a valve element 2 provided on a valve seat 1 via a support shaft 1 in such a manner the same can open and close, a coil spring 5 making the valve element 2 abut on a seat surface 12 of a valve seat 1 and energizing the same in a direction closing the valve, and a heat resistant buffering seal member 6 put between the valve element 2 and the seat surface 12 of the valve seat 1. The heat resistant buffering seal member 6 is formed in a disk shape having elasticity, and is fixed to the valve element 2 side at a center part thereof under a condition where an outer circumference edge part includes a predetermined annular space h in a space with the valve element 2. An annular abutment part 61 abutting on the seat surface 12 of the valve seat 1 in valve closure is formed on the outer circumference part of the disk shape heat resistance buffering seal member 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust pressure sensitive control muffler valve that is provided at an end of an exhaust pipe in a muffler and that opens and closes by exhaust pressure.

  As a conventional control muffler valve, for example, as shown in FIG. 8, a valve provided so as to be openable and closable via a support shaft 103 with respect to a valve seat 102 provided at an end of an exhaust pipe 101 in the muffler body. In a control muffler valve comprising a body 104 and a coil spring 105 that urges the valve body 104 against the seat surface of the valve seat 102 to urge the valve in a closing direction, the seat surface side of the valve seat 102 is heat resistant. A material using a mat-like member obtained by compressing a stainless steel wire mesh is known as the conductive buffer seal member 106 (see, for example, Patent Document 1).

JP-A-9-170425

However, in the control muffler valve of the conventional example, since a mat-like member obtained by compressing a stainless wire mesh is used as the heat-resistant buffer seal member 106, there is a problem in that the weight and cost are increased.
In addition, even if the wire density is reduced by compression, gas leaks from between the stitches, so that there is a limit to the sealing performance. There is a problem that an impact sound is generated when the valve is operated.

  The problem to be solved by the present invention is to provide a control muffler valve that is excellent in shock-absorbing performance and sealing performance, and that can be reduced in weight and cost.

  In order to solve the above-mentioned problems, a control muffler valve according to claim 1 includes a valve body that can be opened and closed with respect to a valve seat via a support shaft, and the valve body abutted against a seat surface of the valve seat. In the valve for a control muffler, comprising a biasing means for biasing the valve in a closing direction, and a heat-resistant buffer seal member interposed between the valve body and a seat surface of the valve seat. Means characterized in that the sealing member is formed in a disc shape having elasticity, and the central portion is fixed to the valve body side with the outer peripheral edge portion having a predetermined annular space between the seal member and the valve body. It was.

  The control muffler valve according to claim 2 is the control muffler valve according to claim 1, wherein the disc-shaped heat-resistant buffer seal member has an annular shape that contacts the seat surface of the valve seat when the valve is closed. The means is characterized in that the contact portion is formed.

  The control muffler valve according to claim 3 is the control muffler valve according to claim 2, wherein a plurality of annular folds concentric with the annular contact portion are provided inside the annular contact portion of the heat-resistant buffer seal member. The feature is that it is formed.

  The control muffler valve according to claim 4 is the control muffler valve according to claim 2 or 3, wherein a part of the annular contact portion of the heat-resistant buffer seal member is a seat when the valve is closed from the open state. A predetermined angle difference is provided between the contact surface of the annular contact portion and the seat surface so that the entire surface comes into contact with the elasticity of the heat-resistant buffer seal member after contacting the surface. .

In the control muffler valve according to claim 1, as described above, the heat-resistant buffer seal member is formed in a disk shape having elasticity, and the outer peripheral edge portion has a predetermined annular space with the valve body. With the configuration in which the central portion is fixed to the valve body side, the outer peripheral edge portion of the disk-shaped heat-resistant buffer seal member bends in the valve body direction when the valve is closed, so that excellent buffer performance is obtained. As a result, the impact noise can be suppressed and the outer peripheral edge of the heat-resistant cushioning seal member can be brought into contact with the seat surface over the entire week. Even if there is a deviation in the alignment, the effect of being able to exhibit excellent sealing performance is obtained.
In addition, since the heat-resistant buffer seal member has a disk shape, the thickness can be reduced and the material cost can be reduced, thereby reducing the weight and cost.

  In the control muffler valve according to claim 2, as described above, the annular contact portion that contacts the seat surface of the valve seat when the valve is closed is formed on the outer peripheral edge portion of the disk-shaped heat-resistant buffer seal member. With this configuration, the annular contact portion can be reliably contacted with the seat surface over the entire week.

  In the control muffler valve according to claim 3, as described above, a plurality of annular folds concentric with the annular contact portion are formed inside the annular contact portion of the heat-resistant buffer seal member. As a result, the rigidity of the heat-resistant buffer seal member can be reduced, thereby increasing the buffer effect, and the plate thickness of the heat-resistant buffer seal member can be increased by that much, thereby improving the durability. .

  5. The control muffler valve according to claim 4, wherein when the valve is closed from the open state, a part of the annular contact portion of the heat-resistant buffer seal member comes into contact with the seat surface as described above. By adopting a configuration in which a predetermined angular difference is provided between the contact surface of the annular contact portion and the seat surface so that the entire contact is made by the elasticity of the member, the buffering performance can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

The control muffler valve of the first embodiment corresponds to the invention described in claim 1.
First, the control muffler valve of the first embodiment will be described with reference to the drawings.

FIG. 1 is a plan view showing a control muffler valve according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.
The control muffler valve includes a valve seat 1, a valve body 2, a support shaft 3, a bush 4, a coil spring (biasing member) 5, and a heat-resistant buffer seal member 6.

More specifically, the valve seat 1 includes a pipe portion 11 connected and fixed to the downstream end portion of the exhaust pipe in the muffler body, and outward from the end portion of the pipe portion 11, that is, the axis of the pipe portion 11. A sheet surface 12 extending in a right-angle direction, a substrate portion 13 further extending from the outer peripheral edge of one end of the sheet surface 12, and a shaft support portion 14 bent up upward and vertically raised. , 14, and shaft support portions 14, 14 are formed with shaft holes (not shown).
It is also possible to weld the pipe part 11 and the pipe part 11 side of the seat surface 12 directly to the opening of the partition plate provided in the muffler body.

  The valve body 2 includes a main body portion 21, a base plate portion 22 extending outward from the outer periphery of the main body portion 21, and shaft support portions 23, 23 which are vertically raised by bending upward both sides thereof. The shaft support portions 23, 23 are formed with shaft holes 24, 24. And the main-body part 21 is provided with the protrusion part 21b which protrudes below leaving the outer peripheral edge part 21a.

  Both shaft support portions 23, 23 of the valve body 2 are positioned inside the shaft support portions 14, 14 of the valve seat 1, and the shaft holes of both shaft support portions 14, 14 and both shaft support portions 23, The valve body 2 is assembled to the valve seat 1 so as to be openable and closable around the support shaft 3 by inserting the support shaft 3 through the shaft holes 24 and 24 of the shaft 23. And the support shaft 3 is being fixed by welding the both ends on the outer side of both shaft support parts 14 and 14.

  The bushes 4 and 4 are mounted in the shaft holes 24 and 24 in the shaft support portions 23 and 23 of the valve body 2, respectively. The bushes 4 and 4 are formed by pressing and solidifying a stainless steel wire mesh, and are cylindrically mounted between the shaft holes 24 and 24 of the shaft support portions 23 and 23 and the support shaft 3. The main body 41 is composed of the shaft support portions 23 and 23 and the outward flange portions 42 interposed between the shaft support portions 14 and 14.

  The coil spring 5 is mounted around the support shaft 3, and both ends of the coil spring 5 abut on and engage with the main body portion 21 of the valve body 2 and the base plate portion 13 of the valve seat 1 to close the valve. Energized.

  The heat-resistant buffer seal member 6 is formed in a disc shape with a thin stainless steel plate material having a predetermined elasticity of about 0.3 to 0.6 mm, and an annular contact portion 61 projecting downward is formed on the outer peripheral edge portion thereof. Is formed. The heat-resistant cushioning seal member 6 is spot welded to the central portion of the valve body 2 so that the center portion of the heat-resistant buffer seal member 6 is interposed between the annular contact portion 61 and the outer peripheral edge portion 21a of the main body portion 21 of the valve body 2. It is attached and fixed in a state where a predetermined annular space h is formed. The heat-resistant buffer sheath member 6 can be fixed with a rivet in addition to spot welding.

Next, operations and effects of the first embodiment will be described.
Since the first embodiment is configured as described above, the fluid force (exhaust pressure) caused by the exhaust gas (indicated by arrow → A) flowing in the muffler is small at the time of low engine rotation. Thus, the urging force of the coil spring 5 exceeds and the valve is kept closed.
When the valve is closed, the annular contact portion 61 of the heat-resistant buffer seal member 6 mounted and fixed to the valve body 2 is brought into surface contact with the seat surface 12 of the valve seat 1, and the state is maintained by a predetermined urging force. Maintained.

  Next, when the engine is running at high and high speeds, the fluid force (exhaust pressure) due to the exhaust gas flowing in the muffler increases, so the fluid force exceeds the urging force of the coil spring 5 and the valve opens. .

  Further, when the engine is rotated at a low speed from the state where the valve is opened, the fluid force (exhaust pressure) due to the exhaust gas flowing in the muffler is reduced, and the urging force of the coil spring 5 is smaller as shown in FIG. Above that, the valve is closed again.

  In the first embodiment, the heat-resistant buffer seal member 6 is formed in a disk shape having elasticity, and the outer peripheral edge portion has a predetermined annular space h between the valve body 2 and the central portion is a valve. An annular contact portion 61 that is fixed to the body 2 side and that contacts the seat surface 12 of the valve seat 1 when the valve is closed is formed on the outer peripheral edge portion of the disk-shaped heat-resistant buffer seal member 6. Thus, when the valve is closed, first, the annular contact portion 61 of the heat-resistant buffer seal member 6 contacts the seat surface 12 of the valve seat 1, and the heat-resistant buffer seal member 6 bends due to its elasticity. The effect that the impact sound can be suppressed by the action is obtained.

In addition, since the predetermined annular space h exists between the annular contact portion 61 formed on the outer peripheral edge portion of the heat-resistant buffer seal member 6 and the valve body 2, the annular contact portion 61 can be moved to the whole week. Since the sheet surface 12 can be surely brought into contact with the seat surface 12, the excellent sealing performance can be exhibited even if the alignment between the valve body 2 and the seat surface 12 is deviated. Is obtained.
In addition, since the heat-resistant buffer seal member 6 has a disk shape, the thickness can be reduced and the material cost can be reduced. Thus, the effect of reducing the weight and the cost can be obtained.
And since the heat-resistant buffer seal member 6 can be made by press molding or the like, it can be made more accurately and cheaply in large quantities than the mesh.

  Next, another embodiment will be described. In the description of the other embodiments, the same components as those of the first embodiment are not shown, or the same reference numerals are given and the description thereof is omitted, and only the differences are described.

  The second embodiment shows a modification of the heat-resistant buffer seal member 6 in the control muffler valve in the first embodiment. FIGS. 3A and 3B are schematic sectional views of the control muffler valve. As shown in FIG. 4 (plan view of the heat-resistant buffer seal member) and FIG. 5 (longitudinal sectional view of the heat-resistant buffer seal member), the heat-resistant buffer seal member 6 has a flat portion 62 at the center thereof and the outer periphery thereof. The embodiment is different from the first embodiment in that an annular contact portion 61 is formed by an annular bead projecting downward on the outer peripheral edge of the outer peripheral edge portion. .

  Moreover, in this Example 2, although the main-body part 21 of the valve body 2 is entirely formed in the plane, as above-mentioned, the cross-sectional C character which the outer peripheral side of the heat-resistant buffer seal member 6 inclines below. As a result, an annular gap h is formed.

  Therefore, in the second embodiment, in addition to the same effects as in the first embodiment, an additional effect that the structure of the valve body 2 can be simplified is obtained.

  The third embodiment shows a modification of the heat-resistant buffer seal member 6 in the control muffler valve in the first embodiment. As shown in FIG. 6 (longitudinal sectional view of the heat-resistant buffer seal member), This is different from the first and second embodiments in that a plurality of annular folds 63 concentric with the annular contact portion 61 are formed inside the annular contact portion 61 of the seal member 6. .

  Accordingly, in the second embodiment, the same effects as those of the first and second embodiments can be obtained, and the rigidity of the heat-resistant buffer seal member 6 is reduced by forming a plurality of annular folds 63, whereby the shock absorbing effect is obtained. In addition, it is possible to increase the plate thickness of the heat-resistant buffer seal member by that amount, and an additional effect that the durability can be improved is obtained.

The fourth embodiment shows a modification of the heat-resistant buffer seal member 6 in the control muffler valve in the first embodiment. As shown in FIG. 7, when the valve is closed from the open state, the heat-resistant buffer seal member is shown. 6 between the contact surface of the annular contact portion 61 and the sheet surface 12 so that the entire surface contacts with the elasticity of the heat-resistant buffer seal member 6 after a portion of the annular contact portion 61 contacts the sheet surface 12. By adopting a configuration in which a predetermined angle is provided, the buffering performance at the time of valve closing can be further enhanced, which is different from the first to third embodiments.
Therefore, in the fourth embodiment, the same effect as in the first embodiment can be obtained, and an additional effect that the effect of suppressing the impact sound when the valve is closed can be further enhanced.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
For example, in the embodiment, a valve seat in which the seat surface 12 is formed in a flat surface is taken as an example, but the present invention can also be applied to a seat surface formed in a tapered shape.
It is also possible to weld the pipe part 11 and the pipe part 11 side of the seat surface 12 directly to the opening of the partition plate provided in the muffler body.

It is a figure which shows the valve | bulb for control mufflers of Example 1. FIG. It is a longitudinal cross-sectional view in the II-II line of FIG. 6 is a schematic cross-sectional view showing a control muffler valve of Example 2. FIG. 6 is a plan view of a heat-resistant buffer seal member in a control muffler valve of Embodiment 2. FIG. 6 is a longitudinal sectional view of a heat-resistant buffer seal member in a control muffler valve of Example 2. FIG. 6 is a longitudinal sectional view of a heat-resistant buffer seal member in a control muffler valve of Example 3. FIG. 6 is a longitudinal sectional view of a heat-resistant buffer seal member in a control muffler valve of Example 4. FIG. It is a longitudinal cross-sectional view which shows the valve | bulb for control mufflers of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve seat 11 Pipe part 12 Seat surface 13 Substrate part 14 Shaft support part 2 Valve body 21 Main body part 21a Outer peripheral edge part 21b Protrusion part 22 Substrate part 23 Shaft support part 24 Shaft hole 3 Support shaft 4 Bushing 41 Cylindrical main body part 42 Outward flange part 5 Coil spring (biasing means)
6 heat-resistant buffer seal member 61 annular contact portion 62 flat portion 63 annular fold h annular clearance

Claims (4)

A valve body that can be opened and closed with respect to the valve seat via a support shaft, an urging means that urges the valve body in a closing direction by contacting the valve body with a seat surface of the valve seat, and the valve body In a control muffler valve provided with a heat-resistant buffer seal member interposed between the seat surface of the valve seat,
The heat-resistant buffer seal member is formed in a disk shape having elasticity, and the outer peripheral edge portion has a predetermined annular space between the valve body and the central portion is fixed to the valve body side. Characteristic control muffler valve.   2. The control muffler valve according to claim 1, wherein an annular contact portion that protrudes downward and contacts the seat surface of the valve seat when the valve is closed is formed on an outer peripheral edge portion of the disk-shaped heat-resistant buffer seal member. A control muffler valve characterized by   The control muffler valve according to claim 2, wherein a plurality of annular folds concentric with the annular contact portion are formed inside the annular contact portion of the heat-resistant buffer seal member. Valve for.   4. The control muffler valve according to claim 2, wherein when the valve is closed from the open state, a part of the annular contact portion of the heat-resistant buffer seal member comes into contact with the seat surface. A control muffler valve characterized in that a predetermined angular difference is provided between the contact surface of the annular contact portion and the seat surface so that the entire contact is made by elasticity.

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