JP2019019787A - Exhaust valve device - Google Patents

Abstract

To provide an exhaust valve device capable of easily and surely preventing a coil spring from being worn, by providing a collar member as a buffer member integrally in a valve body and making the collar member movable together with the valve body.SOLUTION: An exhaust valve device 10 comprises: a valve body 20 which is installed in an exhaust passage inside of a muffler, and opens and closes the exhaust passage in accordance with an exhaust pressure of an exhaust gas; a valve seat 11 to which the valve body 20 is abutted when the valve body 20 is closed; a spindle 17 which is fixed to the valve seat 11 and supports the valve body 20 in such a manner that the valve body can be freely oscillated; a collar member 29 through which the spindle 17 is inserted; and a twist coil spring 30 with which the collar member 29 is mounted externally and which energizes the valve body 20 in a closing direction. In the exhaust valve device, a flange part 29b of the collar member 29 is fixed to a flange 26 in a side portion 23 of the valve body 20 by welding or the like and when opening/closing the valve body 20, the collar member 29 is freely oscillated together with the valve body 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an exhaust valve device (exhaust control valve) that opens and closes an exhaust passage in a silencer in accordance with an exhaust pressure of exhaust gas from an engine.

  For example, in a multi-cylinder engine for an automobile, an intake control valve that generates a swirl in a fuel chamber for improving a combustion state of an air-fuel mixture employs the rotation shaft rattling prevention device disclosed in Patent Document 1. The rotary shaft rattling prevention device for an intake control valve disclosed in Patent Document 1 can be expanded by a kerf provided in the direction of the central axis and is rotatably fitted to a small diameter portion of the rotary shaft. A shock-absorbing member and a spring member that presses against the outer peripheral surface of the shock-absorbing member and pushes the rotating shaft in a direction perpendicular to the central axis, and a protrusion extending in the central axial direction protrudes outward from the shock-absorbing member. Provided, and a kerf is formed in the protrusion.

  Then, when the spring member is set in pressure contact with the buffer member, if the spring member hits the projection, the buffer member rotates due to a slight imbalance of the spring load acting on the projection and the kerf does not contact the spring member. Move to position. Further, when the buffer member rotates in accordance with the rotation of the rotating shaft, the projection portion hits the spring member to prevent further rotation, and the kerf is not brought into contact with the spring member. As a result, the buffer member is expanded by the spring member, and the spring member is prevented from coming into direct contact with the rotating shaft and being worn.

Japanese Patent No. 4180760

  However, in the conventional control valve, since the buffer member is rotatably fitted to the small-diameter portion of the rotating shaft, the buffer member is moved relative to the spring member, and the friction between the buffer member and the spring member is generated. It was difficult to sufficiently suppress wear of the spring member.

  Therefore, the present invention has been made to solve the above-described problems.

  The invention of the present application is installed in an exhaust passage in a silencer, and opens and closes the exhaust passage according to the exhaust gas exhaust pressure, and a valve seat that contacts the valve body when the valve body is closed, A support shaft fixed to the valve seat and swingably supporting the valve body, a buffer member through which the support shaft is inserted, a coil spring that covers the buffer member and urges the valve body in a closing direction The buffer member is disposed between a portion where the coil spring urges the valve body and the support shaft, and is provided integrally with the valve body. The gist of the invention is that the buffer member swings together with the valve body during opening and closing.

  As described above, according to the present invention, the cushioning member disposed between the support shaft and the coil spring is provided integrally with the valve body so as to move together with the valve body, thereby further suppressing the wear of the coil spring. it can.

It is a schematic block diagram of the silencer which incorporated the exhaust valve apparatus of 1st Embodiment of this invention. It is the perspective view which looked at the exhaust valve apparatus of the said 1st Embodiment from the valve body side. It is a disassembled perspective view of the exhaust valve apparatus of the said 1st Embodiment. It is a rear view of the exhaust valve device of the first embodiment. (A) is sectional drawing which follows the AA line in FIG. 4, (b) is explanatory drawing which shows the relationship between the spindle which rocks the said valve body, a coil spring, and a collar member. It is the perspective view which looked at the exhaust valve apparatus of 2nd Embodiment of this invention from the valve body side. It is a rear view of the exhaust valve apparatus of the said 2nd Embodiment. (A) is a perspective view of the collar member of the exhaust valve device according to the second embodiment, and (b) is an explanatory view showing the relationship among a support shaft, a coil spring, and a collar member that swing the valve body of the exhaust valve device. . It is the perspective view which looked at the exhaust valve apparatus of 3rd Embodiment of this invention from the valve body side. (A) is a perspective view of the valve body of the exhaust valve apparatus of 3rd Embodiment, (b) is a perspective view which shows the state which mounted | wore the valve body of 3rd Embodiment to the spindle.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a schematic configuration diagram of a silencer incorporating an exhaust valve device according to a first embodiment of the present invention, FIG. 2 is a perspective view of the exhaust valve device viewed from the valve body side, and FIG. 3 is an exploded perspective view of the exhaust valve device. 4 is a rear view of the exhaust valve device, FIG. 5A is a cross-sectional view taken along the line AA in FIG. 4, and FIG. 5B is a relationship between a support shaft, a coil spring, and a collar member for swinging the valve body. It is explanatory drawing which shows.

  As shown in FIG. 1, the exhaust valve device 10 is attached to one through-hole 9b of a pair of through-holes 9a and 9b formed in a baffle plate (partition plate) 9 that partitions the silencer (muffler) 1 inside. The through hole 9b serving as an exhaust passage in the silencer 1 is opened and closed according to the exhaust pressure of exhaust gas G from an engine (not shown).

  As shown in FIG. 1, the silencer 1 includes a substantially cylindrical outer shell 2 and an outer plate 3, 4 that closes both front and rear opening portions of the outer shell 2 to form a silencer body (muffler body). Exhaust discharge sound generated from an engine (not shown) and high-temperature exhaust gas G are supplied into an inlet pipe (exhaust pipe) 5, outlet pipe 6, inner pipe 7, and a pair of baffle plates (partition plates). 8 and 9 are used to mute and cool.

  As shown in FIGS. 1 to 3, the exhaust valve device 10 includes a metal valve seat 11 that is fixed to the through hole 9 b of the baffle plate 9 by spot welding or the like, and a cylindrical portion that serves as an exhaust passage of the valve seat 11. (Inlet pipe) Metal valve body 20 that opens and closes 13, metal torsion coil spring (coil spring) 30 that urges the valve body 20 in the closing direction, and downstream of the valve seat 11 in the flow direction of the exhaust gas G It is comprised with the metal outer cylinder 40 fixed to the edge part 14 of the side by spot welding etc. FIG.

  As shown in FIGS. 2 and 3, the valve seat 11 includes a flat plate portion 12 whose upper corners are arc-shaped and substantially rectangular, and a cylindrical portion 13 formed integrally and projecting in the center of the front surface of the flat plate portion 12. The flat plate portion 12 includes an upper end portion 14a which is integrally bent rearward from the upper end edge and both side end edges, and an end portion 14 having both end portions 14b and 14b.

  At the lower end edge of the flat plate portion 12 of the valve seat 11, a stopper receiving portion 15 that restricts the swinging of the valve body 20 is integrally bent rearward. A notch 15a is formed near one end 14b of the stopper receiving portion 15. In addition, a pair of flanges 16 and 16 having a shaft through hole 16a at the center are integrally formed below the side end portions 14b and 14b of the valve seat 11. A support shaft 17 passes between the shaft through holes 16a of the pair of flanges 16 and 16. Both ends of the support shaft 17 passing through the shaft through holes 16a of the pair of flanges 16 and 16 are fixed to the pair of flanges 16 and 16 by welding or the like.

  As shown in FIGS. 2 and 3, the valve body 20 is formed by integrally bending a flat plate portion 21 with both upper corners in an arc shape and a substantially rectangular shape, and rearward from the upper edge and both side edges of the flat plate portion 21. An upper part 22 and both side parts 23, 23 are provided.

  On the lower end edge of the flat plate portion 21 of the valve body 20, the inclined piece portion 24 is bent and formed backward. A stopper 25 that abuts against the stopper receiving portion 15 of the valve seat 11 is integrally formed at the center of the inclined piece portion 24. The angle until the stopper 25 of the valve body 20 abuts against the stopper receiving portion 15 of the valve seat 11 and the swinging angle of the valve body 20 is regulated is the predetermined opening degree of the valve body 20.

  Further, a notch 24 a is formed near one side 23 of the inclined piece 24. Further, a pair of flanges 26, 26 having a shaft through hole 26 a at the center are integrally formed on the lower side of both side portions 23, 23 of the valve body 20. A support shaft 17 that pivotally supports the valve body 20 with respect to the valve seat 11 is passed through the shaft through holes 26a of the pair of flanges 26 and 26.

  Further, a circular convex portion 21a is integrally formed on the front surface side at the center of the flat plate portion 21 of the valve body 20, and a heat-resistant area is formed around the circular convex portion 21a on the front surface of the flat plate portion 21. An annular plate-shaped buffer mat 27 is fixed by spot welding or the like. When the valve body 20 is closed, the flat plate portion 21 of the valve body 20 comes into contact with the flat plate portion 12 of the valve seat 11 through the buffer mat 27 without any gap. An annular bush 28 is passed through the support shaft 17 between the pair of flanges 16 and 16 of the valve seat 11 and the pair of flanges 26 and 26 of the valve body 20. The valve body 20 is pivotally supported on the support shaft 17 through the pair of bushes 28, 28 so as to be swingable.

  As shown in FIGS. 2 and 4, on the inner surface side of one flange 26 of the valve body 20 (which is not the flange 26 on the side where the notch 24a is formed), a metal collar member ( A plate-like flange portion (welding portion) 29b of the buffer member 29 is welded (fixed) by welding or the like. That is, the collar member 29 is integrally formed perpendicularly to the axial direction on one end side of the cylindrical portion 29a through which the support shaft 17 is inserted, and on one flange 26 of the valve body 20. A plate-like flange portion 29 b to be welded is provided, and one end 31 of the torsion coil spring 30 is disposed between the portion that urges the valve body 20 and the support shaft 17. In addition, the cylindrical portion 29 a of the collar member 29 has a torsion coil spring 30 and a predetermined clearance K between the cylindrical member 29 a and the support shaft 17. When the valve body 20 is opened and closed, the collar member 29 swings together with the valve body 20.

  As shown in FIGS. 2 and 4, the torsion coil spring 30 is mounted around the support shaft 17, and its one end 31 is brought into contact with and locked to the back surface of the flat plate portion 21 of the valve body 20, and the other end 32. Is locked to the notch 15 a of the stopper receiving portion 15 of the valve seat 11. Thereby, the valve body 20 is urged toward the valve seat 11 in the closing direction.

  As shown in FIGS. 2 and 3, the outer cylinder 40 includes an upper wall (ceiling wall) 41 that covers the upper end portion 14 a of the end portion 14 of the valve seat 11, and a valve seat 11 in which a central portion 42 a protrudes in an arc shape. It is provided with both side walls 42 and 42 covering both side end portions 14b and 14b of the end portion 14 and is formed in a substantially inverted U-shaped plate shape, and is fixed to the end portion 14 of the valve seat 11 by spot welding or the like. .

  When the valve body 20 has a predetermined opening degree, the arcuate central portion 42a of the upper wall 41 and both side walls 42, 42 of the outer cylinder 40 has an open valve body 20 that resists the biasing force of the torsion coil spring 30. The upper part 22 and both side parts 23 and 23 are each covered. The predetermined opening degree of the valve body 20 is an angle at which the valve body 20 swings when the exhaust pressure of the exhaust gas G is maximum, and is set to a maximum of 45 °, for example. Thereby, when the valve body 20 is opened, the opening of the valve body 20 is increased by covering the periphery of the valve body 20 with the outer cylinder 40, and the effect of lowering the back pressure can be obtained. .

  According to the exhaust valve device 10 of the above embodiment, the exhaust body G of the exhaust valve device 10 is closed because the exhaust pressure of the exhaust gas G flowing through the silencer 1 is small when the engine is running at a low speed. When the valve body 20 is closed, the exhaust gas G flows in the silencer 1 as indicated by an arrow R1 in FIG. 1, and in the intermediate route from the end 5a of the inlet pipe 5 to the inner pipe 7, the baffle plate 9 The sound level is reduced by the diameter of the through hole 9a (ventilation resistance).

  Further, when the engine speed exceeds the predetermined low-speed rotation range and the exhaust pressure of the exhaust gas G exceeds the urging force of the torsion coil spring 30, the valve body 20 of the exhaust valve device 10 is twisted. It opens against the elastic biasing force of the coil spring 30. In this case, in the intermediate route from the end 5a of the inlet pipe 5 to the inner pipe 7, the flow shown by the arrow R1 in FIG. 1 passing through the through hole 9a of the baffle plate 9 and the cylindrical portion of the valve seat 11 of the exhaust valve device 10 13 (passage hole 9b of the baffle plate 9) passes through the two flows indicated by the arrow R2 in FIG. 1, the cross-sectional area through which the exhaust gas G flows increases, and the ventilation resistance decreases.

  Further, a pair of flanges 26 and 26 of the valve body 20 are supported on the same support shaft 17 between the pair of flanges 16 and 16 of the valve seat 11 via a bush 28 so as to be swingable. Since the torsion coil spring 30 energizing in the closing direction is externally provided, the number of parts can be reduced correspondingly, and the overall structure can be simplified.

  2 and 5 (a) and 5 (b), the plate-like flange portion 29b of the collar member 29 in which the cylindrical portion 29a is interposed between the support shaft 17 and the torsion coil spring 30 is provided as a valve. A collar member 29 in which a cylindrical portion 29 a having a diameter larger than the diameter of the support shaft 17 is in contact with the torsion coil spring 30 by being fixed to the inner surface side of one flange 26 below the both side portions 23, 23 of the body 20. By swinging together with the valve body 20, wear of the torsion coil spring 30, especially wear on the one end 31 side of the torsion coil spring 30 can be easily and reliably prevented at low cost.

  Furthermore, by providing the valve seat 11 with the stopper receiving portion 15 that restricts the swing of the valve body 20, the opening degree (swing angle) is controlled so that the stopper 25 of the valve body 20 hits the stopper receiving portion 15 of the valve seat 11. ) Can be the maximum angle.

  6 is a perspective view of the exhaust valve device according to the second embodiment of the present invention as viewed from the valve body side, FIG. 7 is a rear view of the exhaust valve device, and FIG. 8A is a perspective view of a collar member of the exhaust valve device. FIG. 8B is an explanatory view showing the relationship among the support shaft, the coil spring, and the collar member for swinging the valve body of the exhaust valve device.

  As shown in FIGS. 6 to 8, the collar member (buffer member) 29 </ b> A includes a semi-cylindrical portion 29 a ′ through which the support shaft 17 is inserted and a flange portion 29 b as a welding portion. Different from one embodiment. Since other configurations are the same as those of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As described above, according to the exhaust valve device 10 ′ of the second embodiment, as shown in FIGS. 6 and 8B, the collar member in which the semi-cylindrical portion 29 a ′ is interposed between the support shaft 17 and the torsion coil spring 30. A plate-like flange portion 29b of 29A is fixed to the inner surface side of one flange 26 on the lower side of both side portions 23, 23 of the valve body 20 by welding or the like, and is a semi-cylinder having a diameter larger than the diameter of the support shaft 17. Since the collar member 29A in which the portion 29a ′ contacts the torsion coil spring 30 is swung together with the valve body 20, the wear of the torsion coil spring 30, particularly the wear on the one end 31 side of the torsion coil spring 30 is simple and reliable. Can be prevented at low cost.

  FIG. 9 is a perspective view of an exhaust valve device according to a third embodiment of the present invention as viewed from the valve body side, FIG. 10 (a) is a perspective view of the valve body of the exhaust valve device, and FIG. 10 (b) is the valve body. It is a perspective view which shows the state with which the spindle was mounted | worn.

  As shown in FIGS. 9 and 10, the collar member (buffer member) 29B is integrally projected on one flange 26 of the valve body 20 (not the flange 26 on the side where the notch 24a is formed). There is a difference from the first embodiment. Since other configurations are the same as those of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As described above, according to the exhaust valve device 10 ″ of the third embodiment, the collar member 29B interposed between the support shaft 17 and the torsion coil spring 30 as shown in FIGS. 9 and 10A, 10B. The cylindrical portion 29 a is integrally formed on the inner surface side of one flange 26 below the both side portions 23, 23 of the valve body 20, and the cylindrical portion 29 a having a diameter larger than the diameter of the support shaft 17 is connected to the torsion coil spring 30. By causing the contacting collar member 29B to swing together with the valve body 20, it is possible to easily and reliably prevent wear of the torsion coil spring 30, in particular, wear on the one end 31 side of the torsion coil spring 30 at low cost. it can.

  In addition, according to each said embodiment, although the exhaust valve apparatus was attached to the through-hole formed in the baffle plate (partition plate) which partitions off the inside of a silencer, it is attached to the edge part of the inlet pipe (exhaust pipe) in a silencer. An exhaust valve device may be attached.

1 Silencer 9 Baffle plate (partition plate)
9b Through hole (exhaust passage)
10, 10 ', 10 "Exhaust valve device 11 Valve seat 17 Support shaft 20 Valve body 23, 23 Both sides 26 One flange 29, 29A, 29B Collar member (buffer member)
29a Cylindrical part 29a 'Semi-cylindrical part 29b Gutter part (welding part)
30 Torsion coil spring (coil spring)
31 One end G Exhaust gas K Clearance

Claims (6)

A valve body installed in the exhaust passage in the silencer and opening and closing the exhaust passage according to the exhaust gas exhaust pressure;
A valve seat against which the valve body abuts when the valve body is closed;
A support shaft fixed to the valve seat and supporting the valve body in a swingable manner;
A buffer member through which the support shaft is inserted;
A coil spring that covers the buffer member and biases the valve body in a closing direction;
In an exhaust valve device comprising:
The buffer member is disposed between a portion where the coil spring urges the valve body and the support shaft and is provided integrally with the valve body,
The exhaust valve device, wherein the buffer member swings together with the valve body when the valve body is opened and closed. The exhaust valve device according to claim 1,
The exhaust valve device according to claim 1, wherein the buffer member has a predetermined clearance between the buffer shaft and the support shaft. The exhaust valve device according to claim 1 or 2,
The exhaust valve device according to claim 1, wherein the buffer member has a welded portion welded to the valve body. The exhaust valve device according to claim 3,
The said buffer member is provided with the cylindrical part by which the said spindle is penetrated, and the collar part as said welding part, The exhaust valve apparatus characterized by the above-mentioned. The exhaust valve device according to claim 3,
The said buffer member is provided with the semi-cylindrical part by which the said spindle is penetrated, and the collar part as said welding part, The exhaust valve apparatus characterized by the above-mentioned. The exhaust valve device according to claim 1 or 2,
The exhaust valve device, wherein the buffer member is integrally formed with the valve body.

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