JP2006009667A - Exhaust pressure sensitive type control valve for silencer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust pressure sensitive type control valve for a silencer allowing cost and weight reduction by decreasing a number of parts and improving efficiency of assembling working. <P>SOLUTION: A through hole 21 serving as a flow passage of exhaust gas is formed in a baffle plate 2 partitioning an inside of a silencing compartment. A valve body 4 blocking the through hole 21 for opening and closing is formed of a plate spring. A fixed side edge portion of the valve body 4 is fixed to the baffle plate 2 by spot welding P. The valve is constructed so that the through hole 21 is closed by the valve body 4 at the time of engine stop and the plate spring forming the valve body 4 is bent according to an engine output to open the through hole 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an exhaust pressure sensitive control valve for a silencer.

  Conventionally, as a silencer exhaust pressure-sensitive control valve, for example, as shown in FIG. 13, a reed valve 102 facing the exhaust pipe port 101 at a predetermined interval when the engine is stopped is arranged. In which the gas pressure changes in accordance with the engine output. Conventional housing 1 (see, for example, Patent Document 1) or a housing having a valve hole 201a through which exhaust gas flows as shown in FIG. 201 and a valve that opens and closes the valve hole 201a. The valve is elastically bent and deformed, and is constituted by a plate-like valve 202 fixed to a housing 201 having one end fixed, and the plate-like valve 202 is fixed. The plate-like valve 202 is seated on the valve seat 201b provided at the periphery of the valve hole 201a on the housing surface in a state of being urged to the closed side by the elastic restoring force due to its own bending deformation. A conventional example 2 (see, for example, Patent Document 2) is known in which a plate valve 202 is bent and a valve hole 201a is opened when an exhaust pressure acting on the plate valve is applied. .

Japanese Examined Patent Publication No. 62-24609 (Specification (page 2), FIG. 3) Japanese Patent Laid-Open No. 2001-20718 (Specification (page 3), FIG. 3)

However, in the above-described conventional example 1, it is necessary to prepare the bracket 103 and the rivet 104 in addition to the reed valve 102 in order to arrange the reed valve 102 so as to face the exhaust pipe port 101 at a predetermined interval. Therefore, there is a problem that the cost is high and the positioning work of the reed valve 102 is troublesome and the work efficiency is poor.
In the above-described conventional example 2, in addition to the plate-shaped valve 202, a housing 201, a bolt 203 for fixing the housing 201, and a bolt 204 for fixing one end of the plate-shaped valve 202 to the housing 201 are prepared. Therefore, there is a problem that the cost increases and the weight increases.

  The problem to be solved by the present invention is to provide an exhaust pressure-sensitive control valve for a silencer that can reduce the cost and weight by reducing the number of parts and can increase the efficiency of assembly work. is there.

  In order to solve the above-described problem, the exhaust pressure sensitive control valve for a silencer according to claim 1 is formed with a through hole serving as an exhaust gas flow passage formed in a partition plate that partitions the silencer chamber, and the through hole is closed so as to be freely opened and closed. The valve body is configured by a leaf spring, and the through-hole is closed by the valve body when the engine is stopped by fixing the fixed side edge of the valve body to the partition plate, and the valve body is configured according to engine output. The plate spring is configured to bend to open a through hole, and the fixed-side edge of the valve body is fixed to the partition plate by welding.

  The silencer exhaust pressure sensitive control valve according to claim 2 is the silencer exhaust pressure sensitive control valve according to claim 1, wherein the partition plate positions a fixed position of a fixed side edge of the valve element. Protrusions to be formed are formed.

  The silencer exhaust pressure sensitive control valve according to claim 3 is the exhaust pressure sensitive control valve for silencer according to claim 1, wherein the fixed position of the fixed edge of the valve element is positioned on the partition plate. A protruding ridge is formed along the fixed side edge of the valve body, and a notch for positioning the valve body is formed at the base of the ridge by inserting the fixed side edge of the valve body. It was set as the means characterized by.

  According to a fourth aspect of the present invention, the exhaust pressure sensitive control valve for the silencer is formed with a through hole serving as an exhaust gas flow passage formed in a partition plate for partitioning the silencer chamber, and a valve body for closing and closing the through hole is a leaf spring. By fixing the fixed side edge of the valve body to the partition plate, when the engine is stopped, the through hole is closed by the valve body, and the leaf spring constituting the valve body is bent according to the engine output. A pair of fixed pieces extending in the left and right sides of the fixed side edge of the valve body, and projecting the two fixed pieces to the partition plate. The fixed-side end edge of the valve body is fixed to the partition plate by being inserted into the notches formed on the opposing surfaces of the ridges.

  According to a fifth aspect of the present invention, the exhaust pressure sensitive control valve for the silencer is formed with a through hole serving as an exhaust gas flow passage formed in a partition plate that partitions the silencer chamber, and a valve body that closes the through hole so as to be freely opened and closed is a leaf spring. By fixing the fixed side edge of the valve body to the partition plate, when the engine is stopped, the through hole is closed by the valve body, and the leaf spring constituting the valve body is bent according to the engine output. And a support shaft is formed by rounding the tip of a tongue piece extending in the vicinity of the ends of the left and right side edges of the fixed side edge of the valve body. The fixed-side edge of the valve body is fixed to the partition plate by being inserted into holes formed in opposing surfaces of a pair of protrusions protruding from the partition plate, respectively. .

  In the exhaust pressure sensitive control valve for a silencer according to claim 1, as described above, a through-hole serving as an exhaust gas flow passage is formed in the partition plate that partitions the silencer chamber, and the through-hole is opened and closed freely. The plate spring is configured by a leaf spring, and the fixed side edge of the valve body is fixed to the partition plate so that when the engine is stopped, the through hole is closed by the valve body and the valve body is configured according to the engine output. Is bent and the through hole is opened, and the fixed side edge of the valve body is fixed to the partition plate by welding, so that in addition to the leaf spring constituting the valve body, Since it is not necessary to prepare parts such as a bolt for fixing the housing and a bolt for fixing one end of the valve body to the housing, it is possible to reduce costs and weight by reducing the number of parts, and to perform welding work. Only , An effect that it is possible to increase the efficiency of the assembly work can be obtained.

  In the exhaust pressure-sensitive control valve for a silencer according to claim 2, as described above, the partition plate is configured to have a protrusion for positioning the fixed position of the fixed side edge of the valve body. Thus, the valve body can be easily positioned when fixing one end of the valve body to the partition plate.

  In the exhaust pressure responsive control valve for a silencer according to claim 3, as described above, the partition plate has a protrusion for positioning a fixed position of the fixed side edge of the valve body on the fixed side edge of the valve body. And the base of the ridge is formed with a notch for positioning the valve body by inserting the fixed side edge of the valve body, so that the partition plate The valve body can be easily positioned when the one end is fixed.

  The exhaust pressure sensitive control valve for a silencer according to claim 4, wherein, as described above, a through-hole serving as an exhaust gas flow passage is formed in the partition plate that partitions the silencer chamber, and the through-hole is opened and closed freely. The plate is constituted by a leaf spring, and the fixed side edge of the valve body is fixed to the partition plate so that when the engine is stopped, the valve body closes the through hole and constitutes the valve body according to the engine output. A pair of springs is formed so that the through hole is opened by bending, and a fixed piece having a predetermined width is extended to the left and right side edges of the fixed side edge of the valve body, and the fixed pieces protrude from the partition plate. In addition to the leaf springs that constitute the valve body, the fixed side edge of the valve body is fixed to the partition plate by being inserted into the notches formed on the opposing surfaces of the ridges, Housing, bolt and housing for fixing the housing Since it is not necessary to prepare parts such as bolts for fixing one end of the valve body, the cost can be reduced and the weight can be reduced by reducing the number of parts. Since it is only necessary to insert the fixing piece into the notches formed on the opposing surfaces of the pair of protrusions that protrude from the partition plate using the elasticity of the valve body, the efficiency of the assembly work can be improved. The effect of becoming like this is acquired.

  6. The exhaust pressure sensitive control valve for a silencer according to claim 5, wherein, as described above, a through-hole serving as an exhaust gas flow passage is formed in the partition plate that partitions the silencer chamber, and the through-hole is opened and closed freely. The plate spring is configured by a leaf spring, and the fixed side edge of the valve body is fixed to the partition plate so that when the engine is stopped, the through hole is closed by the valve body and the valve body is configured according to the engine output. Is bent so that the through-hole is opened, and the tip of the tongue piece extending in the vicinity of the left and right side edges of the fixed side edge of the valve body is rounded to form a support shaft. By inserting the shaft into the holes formed in the opposing surfaces of the pair of protrusions protruding from the partition plate, the fixed side edge of the valve body is fixed to the partition plate. Other than the leaf springs that make up the housing, the housing and bolts that secure the housing Since there is no need to prepare bolts or other parts for fixing one end of the valve body to the housing, the cost can be reduced and the weight can be reduced by reducing the number of parts. Since it is only necessary to insert the holes into the holes formed on the opposing surfaces of the pair of protrusions protruding from the partition plate using the elasticity of the valve body, the efficiency of the assembly work can be improved. It is done.

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

The silencer exhaust pressure-sensitive control valve according to the first embodiment corresponds to the invention described in claims 1 and 2.
First, the exhaust pressure sensitive control valve for a silencer according to the first embodiment will be described with reference to the drawings.

  1 is a cross-sectional view showing a silencer to which the silencer exhaust pressure sensitive control valve of the first embodiment is applied. FIG. 2 is a perspective view showing the silencer exhaust pressure sensitive control valve of the first embodiment. Is an enlarged sectional view taken along line III-III in FIG. 2, and FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.

  The silencer in which the exhaust pressure sensitive control valve of the first embodiment is incorporated includes a silencer body 1, a baffle plate 2, an inlet pipe 3a, and an outlet pipe 3b as main components.

  As shown in FIG. 1, the silencer body 1 includes a substantially cylindrical outer shell 11, and outer plates 12 and 13 that close both front and rear openings of the outer shell 11. The interior of the silencer body 1 is partitioned by the baffle plate 2 into a first silencer chamber (extended chamber) 1a and a second silencer chamber (extended chamber) 1b.

  The inlet pipe 3a penetrates the upstream outer plate 12 and the baffle plate 2 and the downstream opening thereof communicates with the second silencing chamber 1b. The outlet pipe 3b is connected to the baffle plate 2 and the downstream side. The upstream opening is communicated with the first silencing chamber 1a in a state of passing through the outer plate 13.

The baffle plate 2 is formed with a communication hole 2a that always communicates between the first silencing chamber 1a and the second silencing chamber 1b, and a silencer exhaust pressure-sensitive control valve (to be described in detail later). A is abbreviated as a control valve).
That is, the control valve A includes the baffle plate (partition plate) 2 and the valve body 4.

  More specifically, the baffle plate 2 is a partition plate that partitions the silencer main body 1 (not shown), and the baffle plate 2 is formed with a through hole 21 that constitutes an exhaust gas flow passage.

  As shown in FIGS. 2 to 4, the valve body 4 is configured by a plate spring such as stainless steel having elasticity, and the valve body 4 is overlapped on the downstream side surface of the baffle plate 2, and the fixed side edge thereof. By fixing the portion to the baffle plate 2, the through hole 21 is closed by the valve body 4 when the engine is stopped, and the plate spring constituting the valve body 4 is bent according to the engine output to open the through hole 21. Has been.

That is, in the first embodiment, the fixed side edge of the valve body 4 is fixed to the baffle plate 2 by spot welding P at two locations.
The baffle plate 2 is formed with three protrusions 22 for positioning the fixed position of the fixed side edge of the valve body 4 in a U-shape. The protrusion 22 can be formed simultaneously with the formation of the through hole 21 when the baffle plate 2 is press-formed from a plate material.

Next, operations and effects of the first embodiment will be described.
[When engine is running at low speed]
Since the control valve A according to the first embodiment is configured as described above, first, the valve is set so that the engine speed is not opened in a predetermined low speed range, such as when idling or traveling at a low speed. By setting the urging force due to the elasticity of the leaf springs constituting the body 4, the exhaust pressure flowing through the silencer is small at the time of low engine rotation, so as shown in FIG. The urging force due to the elasticity of the leaf spring constituting the body 4 is greater and the control valve A is kept closed.

  As described above, when the engine is rotating at a low speed, the exhaust gas from the engine first flows into the second silencing chamber (expansion chamber) 1b via the inlet pipe 3a, thereby causing a predetermined pressure loss based on a predetermined pressure loss. The silencing effect can be obtained.

  Next, the exhaust gas flowing into the second silencing chamber (expansion chamber) 1b flows into the first silencing chamber (expansion chamber) 1a from the communication hole 2a formed in the baffle plate 2, thereby causing a predetermined pressure loss. A predetermined silencing effect based on the above can be obtained.

And the exhaust gas which flowed in in the 1st silencer room (expansion room) 1a is discharged | emitted outside the silencer main body 1 via the outlet pipe 3b.
Accordingly, it is possible to satisfy the demand for noise reduction required when the engine rotates at a low speed.

[When engine is rotating at medium and high speed]
Next, when the engine speed exceeds the predetermined low speed rotation range and the exhaust pressure exceeds the urging force due to the elasticity of the leaf spring constituting the valve body 4, the engine is rotated at medium and high speeds as shown in FIG. As shown, control valve A opens.

  In this way, during the middle / high speed rotation of the engine, the exhaust gas from the engine first flows into the second silencing chamber (expansion chamber) 1b via the inlet pipe 3a, thereby reducing the pressure loss to a predetermined level. A predetermined silencing effect is obtained.

  Next, a part of the exhaust gas flowing into the second silencing chamber (expansion chamber) 1 b flows into the first silencing chamber (expansion chamber) 1 a from the communication hole 2 a formed in the baffle plate 2, thereby In addition to obtaining a predetermined silencing effect based on the pressure loss, most of the exhaust gas flowing into the second silencing chamber (expansion chamber) 1b passes through the through hole 21 opened by opening the control valve A. By flowing into the first silencing chamber (expansion chamber) 1a, a predetermined silencing effect based on a predetermined pressure loss can be obtained.

And the exhaust gas which flowed in in the 1st silencer room (expansion room) 1a is discharged | emitted outside the silencer main body 1 via the outlet pipe 3b.
Therefore, when the control valve A is opened, the exhaust resistance when the exhaust gas flows into the first silencing chamber (expansion chamber) 1a from the second silencing chamber (expansion chamber) 1b is reduced. It can satisfy the demand for lower back pressure required during medium and high speed rotation.

As described in detail above, in the exhaust pressure responsive control valve for the silencer of the first embodiment, the baffle plate 2 that partitions the silencer chamber is formed with the through hole 21 that serves as the exhaust gas flow passage. The valve body 4 that can be opened and closed freely is constituted by a leaf spring. By fixing the fixed side edge of the valve body 4 to the baffle plate 2, the through hole 21 is closed by the valve body 4 when the engine is stopped. In response to engine output, the leaf spring constituting the valve body 4 is bent so that the through hole 21 is opened, and the fixed side edge of the valve body 4 is fixed to the baffle plate 2 by spot welding P. As a result, it is not necessary to prepare components such as a housing, a bolt for fixing the housing, and a bolt for fixing one end of the valve body 4 to the housing other than the leaf spring constituting the valve body 4. Because, the cost can be reduced and weight by reduction in the number of component parts, because it requires welding work only effect that it is possible to increase the efficiency of the assembly work can be obtained.
In addition, by fixing with spot welding P, it is possible to reduce the number of parts and assembly man-hours by tightening bolts and nuts, and to form overlays compared to other welding methods. It is possible to reduce the weight because there is no.
However, it goes without saying that in addition to spot welding P, MIG welding, TIG welding, arc welding, and laser welding are also possible.

  Further, the baffle plate 2 is formed with a projection 22 for positioning the fixed position of the fixed side edge of the valve body 4 so that one end of the valve body 4 is fixed to the baffle plate 2 by welding. The valve body 4 can be easily positioned.

  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 silencer exhaust pressure-sensitive control valve according to the second embodiment corresponds to the invention described in claim 3.
The second embodiment shows a modification of the silencer exhaust pressure sensitive control valve in the first embodiment, and FIG. 5 is a perspective view showing the silencer exhaust pressure sensitive control valve of the second embodiment. 6 is an enlarged sectional view taken along line VI-VI in FIG.

That is, in the exhaust pressure-sensitive control valve for the silencer of the second embodiment, the baffle plate 2 has a protrusion 23 for positioning the fixed position of the fixed side edge of the valve body 4 on the fixed side edge of the valve body 4. By forming a notch 23a for positioning the valve body 4 by inserting a fixed side edge of the valve body 4 into the base of the ridge 23, a baffle is formed. The point which made it easy to position the valve body 4 when fixing one end of the valve body 4 to the plate 2 is different from the first embodiment.
Therefore, in the second embodiment, the same effect as in the first embodiment can be obtained.

The silencer exhaust pressure-sensitive control valve according to the third embodiment corresponds to the invention described in claim 4.
The third embodiment shows a modification of the silencer exhaust pressure sensitive control valve in the first embodiment, and FIG. 7 is a perspective view showing the silencer exhaust pressure sensitive control valve of the third embodiment. 8 is an enlarged sectional view taken along line VIII-VIII in FIG. 7, and FIG. 9 is an enlarged sectional view taken along line IX-IX in FIG.

  That is, in the exhaust pressure sensitive control valve for a silencer according to the third embodiment, the fixing pieces 41 and 41 having a predetermined width are extended on the left and right side edges of the fixed side edge of the valve body 4, and both the fixed parts are fixed. By inserting the pieces 41, 41 into cuts 24 a, 24 a formed on the opposing surfaces of the pair of protrusions 24, 24 protruding from the baffle plate 2, the fixed-side edge of the valve body 4 is in contact with the baffle plate 2. This is different from the first and second embodiments in that the configuration is fixed.

  Therefore, in this third embodiment, the same effect as in the first embodiment can be obtained, and the attachment of the valve body 4 to the baffle plate 2 is formed with the fixed pieces 41, 41 on the opposing surfaces of the protrusions 24, 24. Since only the operation of inserting into the notches 24a and 24a using the elasticity of the valve body 4 is required, the efficiency of the assembling work can be further improved.

The silencer exhaust pressure-sensitive control valve according to the fourth embodiment corresponds to the invention described in claim 5.
The fourth embodiment shows a modification of the silencer exhaust pressure-sensitive control valve in the first embodiment, and FIG. 10 is a perspective view showing the silencer exhaust pressure-sensitive control valve of the fourth embodiment. 11 is an enlarged sectional view taken along line XI-XI in FIG. 10, and FIG. 12 is an enlarged sectional view taken along line XII-XII in FIG.

  That is, the silencer exhaust pressure-sensitive control valve according to the fourth embodiment is configured such that the tip end of a tongue piece extending in the vicinity of the left and right side edges of the fixed side edge of the valve body 4 is rounded to the support shaft 42. , 42 are formed, and both support shafts 42, 42 are respectively inserted into holes 25a, 25a formed on opposing surfaces of a pair of protrusions 25, 25 projecting from the baffle plate 2, thereby fixing the fixed side edge of the valve body 4 The point from which the part was fixed with respect to the baffle plate 2 differs from the said Examples 1-3.

  Therefore, in the fourth embodiment, the same effects as in the first embodiment can be obtained, and the attachment of the valve body 4 to the baffle plate 2 is formed on the opposed surfaces of the ridges 24, 24 with the support shafts 42, 42. Since only the operation of inserting the holes 25a and 25a into the holes 25a by using the elasticity of the valve body 4 is required, the efficiency of the assembling work can be further improved.

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 stainless steel plate is used as the material of the valve body 4, but a spring steel having elasticity or a thin plate having heat resistance and elasticity can be used.

  In the embodiment, the through hole 21 is formed in the baffle plate 2, but an inner pipe may be connected to the upstream opening edge of the through hole 21.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing ((A) is a valve closing state, (B) is a valve opening state) which shows the silencer in which the exhaust pressure sensitive control valve of Example 1 was integrated. It is a perspective view which shows the exhaust pressure sensitive control valve for silencers of Example 1. FIG. It is an expanded sectional view in the III-III line of FIG. It is an expanded sectional view in the IV-IV line of FIG. It is a perspective view which shows the exhaust-pressure sensitive control valve for silencers of Example 2. FIG. It is an expanded sectional view in the VI-VI line of FIG. It is a perspective view which shows the exhaust pressure sensitive control valve for silencers of Example 3. FIG. It is an expanded sectional view in the VIII-VIII line of FIG. It is an expanded sectional view in the IX-IX line of FIG. It is a perspective view which shows the exhaust pressure sensitive control valve for silencers of Example 4. FIG. It is an expanded sectional view in the XI-XI line of FIG. It is an expanded sectional view in the XII-XII line of FIG. It is sectional drawing which shows the exhaust pressure sensitive control valve for silencers of the prior art example 1. FIG. It is sectional drawing which shows the exhaust pressure sensitive control valve for silencers of the prior art example 2. FIG.

Explanation of symbols

A Silencer Exhaust Pressure Sensitive Control Valve P Spot Welding 1 Silencer Main Body 1a 1st Silence Chamber 1b 2nd Silence Chamber 11 Outer Shell 12 Outer Plate 13 Outer Plate 2 Baffle Plate (Partition Plate)
2a communication hole 21 through hole 22 protrusion 23 protrusion 23a cut 24 protrusion 24a notch 25 protrusion 25a hole 3a inlet pipe 3b outlet pipe 4 valve element 41 fixed piece 42 support shaft

Claims (5)

A through hole serving as an exhaust gas flow passage is formed in the partition plate that partitions the silencer chamber,
A valve body that closes the through hole so as to be freely opened and closed is configured by a leaf spring,
By fixing the fixed side edge of the valve body to the partition plate, when the engine is stopped, the through hole is closed by the valve body, and the plate spring constituting the valve body bends according to the engine output and the through hole Is configured to open,
An exhaust pressure-sensitive control valve for a silencer, wherein a fixed side edge of the valve body is fixed to the partition plate by welding.   2. The silencer exhaust pressure sensitive control valve according to claim 1, wherein the partition plate is formed with a protrusion for positioning a fixed position of a fixed side edge of the valve body. 3. Pressure sensitive control valve. 2. The exhaust pressure-sensitive control valve for a silencer according to claim 1, wherein a protrusion for positioning a fixed position of a fixed side edge of the valve body is provided along the fixed side edge of the valve body in the partition plate. Formed,
An exhaust pressure sensitive control valve for a muffler, wherein a notch for positioning the valve body is formed by inserting a fixed side edge of the valve body into a base of the ridge. A through hole serving as an exhaust gas flow passage is formed in the partition plate that partitions the silencer chamber,
A valve body that closes the through hole so as to be freely opened and closed is configured by a leaf spring,
By fixing the fixed side edge of the valve body to the partition plate, when the engine is stopped, the through hole is closed by the valve body, and the plate spring constituting the valve body bends according to the engine output and the through hole Is configured to open,
A fixed piece having a predetermined width is extended to the left and right side edges of the fixed side edge of the valve body,
The fixed-side edge portion of the valve body is fixed to the partition plate by inserting the both fixing pieces into cuts formed on opposing surfaces of a pair of protrusions protruding from the partition plate, respectively. Exhaust pressure sensitive control valve for silencer. A through hole serving as an exhaust gas flow passage is formed in the partition plate that partitions the silencer chamber,
A valve body that closes the through hole so as to be freely opened and closed is configured by a leaf spring,
By fixing the fixed side edge of the valve body to the partition plate, when the engine is stopped, the through hole is closed by the valve body, and the plate spring constituting the valve body bends according to the engine output and the through hole Is configured to open,
The support shaft is formed by rounding the tip of the tongue piece extending in the vicinity of the ends of the right and left side edges of the fixed side edge of the valve body,
The fixed-side edge portion of the valve element is fixed to the partition plate by inserting the both support shafts into holes formed in opposing surfaces of a pair of protrusions protruding from the partition plate, respectively. Exhaust pressure sensitive control valve for silencer.

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