JP3152216U - An exhaust pipe for an internal combustion engine having an exhaust control valve - Google Patents

Abstract

Provided is an exhaust control valve having a novel structure that can easily attach an exhaust control valve to an exhaust pipe for an internal combustion engine while ensuring the blockage of a support shaft insertion hole with a simple structure. Another object of the present invention is to provide an exhaust pipe for an internal combustion engine. A support shaft insertion hole is formed with an opening length larger than an outer diameter of a support shaft in the tube axis direction of the tube body, and a valve body is inserted from the axial opening portion of the tube body. The support shaft 24 is inserted into the support shaft insertion hole 22 while being raised in a direction orthogonal to the tube axis from a state in which the support shaft 24 is inclined with respect to the tube axis direction of the tube body 20, and protruded outside the cylindrical wall of the tube body 20. I made it possible. Further, the support shaft insertion hole 22 is sealed by a sealing means using a sealing member 40 that is externally inserted into the support shaft 24. [Selection] Figure 3

Description

  The present invention relates to an exhaust pipe for an internal combustion engine provided with an exhaust control valve that is provided on an exhaust passage through which exhaust gas passes and adjusts an exhaust gas discharge amount.

  In exhaust pipes of internal combustion engines used as power sources for motorcycles and automobiles, when exhaust gas generated in the internal combustion engine is released into the atmosphere as it is, loud exhaust noise is generated due to rapid expansion of the exhaust gas. To do. Therefore, conventionally, a muffler is provided on the exhaust passage of the internal combustion engine, and the exhaust gas is suppressed by releasing the exhaust gas after lowering the temperature and pressure of the exhaust gas.

  However, the silencing effect may not be sufficient in the running conditions of motorcycles and automobiles in specific time zones and places such as early morning or late-night residential areas. Further, there is a case where control of the exhaust efficiency is required as one of means for efficiently extracting the performance of the internal combustion engine according to traveling conditions such as low speed and high speed. In view of this, it has been proposed to provide an exhaust control valve on the exhaust passage to adjust the exhaust amount in accordance with the traveling conditions.

  As a kind of such an exhaust control valve, for example, in Patent Document 1 (Japanese Utility Model Publication No. 4-8735), a disc-shaped valve body is supported by a rotating shaft orthogonal to the pipe axis direction of the exhaust pipe. A structure is disclosed in which the passage sectional area of the exhaust pipe is adjusted by changing the setting of the rotational position of the valve body.

  However, the exhaust control valve described in Patent Document 1 does not specifically disclose an assembly method for pivotally supporting the pivot shaft of the valve body with respect to the peripheral wall of the exhaust pipe, and is not manufactured. It is extremely difficult. That is, the valve body is formed with a rotating shaft that protrudes on both sides in the radial direction, and the valve body can be rotated by inserting both end portions of the rotating shaft into insertion holes provided in the peripheral wall of the exhaust pipe. To support. When the rotary shaft is fixed to the valve body in advance, when assembling the valve body to the exhaust pipe, the valve body is directed from the axial opening of the exhaust pipe by directing the rotary shaft in the pipe axis direction of the exhaust pipe. You can put it in. However, if an attempt is made to raise the rotation shaft inside the exhaust pipe, it interferes with the cylinder wall of the exhaust pipe, and the rotation shaft cannot be inserted into the insertion hole from the inside of the exhaust pipe. On the other hand, the valve body and the rotation shaft are formed separately, and the rotation shaft is inserted into an insertion hole penetrating the peripheral wall of the exhaust pipe, and the valve body is inserted from the axial opening of the exhaust pipe and the rotation shaft is inserted. It is also conceivable to fix to. However, it is not practical because it is extremely difficult to fix the rotating shaft to the valve body, and welding work or the like in the pipe is required.

  In order to cope with such a problem, the applicant of the present invention disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 2007-92087) for mounting a valve body having a rotating shaft that can be inserted into an exhaust pipe. An exhaust pipe structure with holes in the peripheral wall of the exhaust pipe was proposed. In the exhaust pipe structure shown in Patent Document 2, the disk-shaped exhaust control valve is directed in a direction extending in the pipe axis direction through a long mounting hole formed so as to extend in the pipe axis direction of the exhaust pipe. Can be inserted into the exhaust pipe. In addition, since the mounting hole is formed in the direction of the pipe axis of the exhaust pipe, the mounting hole is formed into a narrow shape, so that a significant reduction in strength of the exhaust pipe can be prevented.

  However, in the exhaust pipe structure proposed in Patent Document 2, the mounting hole provided in the peripheral wall of the exhaust pipe must be formed with a dimension longer than the outer diameter dimension of the exhaust control valve. There was a problem that it was difficult to form holes. In addition, after the exhaust control valve is mounted, there is a problem that it is difficult to seal the mounting hole while securing the closing property.

Japanese Utility Model Publication No. 4-8735 Japanese Patent Application Laid-Open No. 2007-92087

  The present invention has been made in the background as described above, and the problem to be solved is an internal combustion engine of an exhaust control valve with a simple structure and ensuring the blockage of the support shaft insertion hole. It is an object of the present invention to provide an exhaust pipe for an internal combustion engine having an exhaust control valve having a novel structure, which can facilitate the mounting operation to the exhaust pipe for use.

  Hereinafter, the aspect of this invention made in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  A first aspect of the present invention relating to an exhaust pipe for an internal combustion engine provided with an exhaust control valve includes: (a) a pipe constituting at least a part of the exhaust pipe for an internal combustion engine; and (b) an inner diameter of the pipe. A valve body having a disk shape with a small outer diameter and disposed inside the tubular body; (c) a support shaft projecting radially outward from the valve body; and (d) The valve body, which is formed through the tube wall of the tube body with an opening length larger than the outer diameter of the support shaft in the tube axis direction of the tube body, and is inserted from the axial opening portion of the tube body A support shaft insertion hole through which the support shaft of the tube body can be protruded from the inclined state in the tube axis direction of the tube body while being gradually raised in a direction perpendicular to the tube axis to protrude outside the tube wall of the tube body (e ) A sealing portion inserted into the support shaft in a state where the support shaft is inserted into the support shaft insertion hole and protrudes outside the cylindrical wall of the tubular body. And (f) a bolt part formed on the spindle, and a fixing nut screwed onto the bolt part, Fastening means for fastening the valve body to the tube body by tightening the fixing nut against the bolt portion of the shaft projecting outward from the support shaft insertion hole of the tube body; It is characterized by comprising.

  In an exhaust pipe for an internal combustion engine having an exhaust control valve structured according to this embodiment, a support shaft insertion hole is formed with an opening length larger than the outer diameter of the support shaft in the tube axis direction of the tube body. ing. As a result, the valve body is inserted from the axial opening of the tube body, and the support shaft is inserted into the support shaft insertion hole while being raised in a direction orthogonal to the tube axis from the inclined state with respect to the tube axis direction of the tube body. The tube can be projected outside the tube wall. As a result, there is no need to provide a through-hole that is large enough to allow the valve body to be inserted through the tube wall of the tube, or to fix the valve body and the support shaft in the tube. Therefore, it is possible to sufficiently ensure the durability of the pipe body and simplify the structure for mounting the exhaust control valve to the exhaust pipe for the internal combustion engine.

  Further, since the support shaft insertion hole is sealed by the sealing means using a sealing member that is externally inserted into the support shaft, it is easy to ensure the blockage of the support shaft insertion hole. In addition, as described above, the support shaft insertion hole only needs to be formed in a size that can secure the movable space of the support shaft when the support shaft is inserted into the support shaft insertion hole. The enlargement in the direction orthogonal to the insertion direction of the member can be avoided. As a result, it becomes easier to ensure the blockage of the support shaft insertion hole.

  Therefore, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to this aspect, the attachment work of the exhaust control valve to the exhaust pipe for the internal combustion engine can be facilitated with a simple structure, and the support shaft can be inserted. The hole can be effectively sealed.

  The sealing means using the sealing member that is externally attached to the support shaft is, for example, the outer surface of the cylindrical wall between the edge of the support shaft insertion hole and the support shaft or around the support shaft insertion hole of the tubular body, and the fixing nut. A mode is also possible in which a sealing member is disposed between the two and the like, and a tightening force of the fixing nut is applied to the sealing member so that the sealing member is in close contact with the tube body, the support shaft, the fixing nut, and the like. Alternatively, a fixing nut having an outer diameter larger than that of the support shaft insertion hole is directly overlapped on the outer surface of the cylindrical wall around the support shaft insertion hole of the tube, or a member having an outer diameter larger than that of the support shaft insertion hole is interposed. Alternatively, the fixing nut may be indirectly overlapped on the outer surface of the cylinder wall, the overlapping portion may be fixed by welding, and the support shaft insertion hole may be sealed between the closed overlapping surfaces. Further, the outer peripheral surface of the annular metal fitting disposed between the radially opposing surfaces of the support shaft and the support shaft insertion hole and the outer surface of the cylindrical wall around the support shaft insertion hole are fixed by welding to seal the support shaft insertion hole. An aspect may be sufficient. More specifically, the mode described below can be adopted for this sealing means.

  That is, a second aspect of the present invention is an annular fitting as a sealing member that is externally inserted to the support shaft of the valve body in an exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the first aspect. Is projected from the support shaft insertion hole to the outside of the tubular wall of the tubular body, and the outer peripheral surface of the annular fitting is welded to the outer circumferential surface of the tubular wall of the tubular body over the entire circumference. The sealing means is configured by sealing between the outer peripheral surface and the outer surface of the tubular wall of the tubular body, and the axial end located outside the tubular wall of the tubular body is formed in the annular fitting. A fastening surface is provided, and the fixing nut is in contact with the fastening surface in a state of being fastened to the bolt portion.

  In this embodiment, the structure for supporting the annular metal fitting to the tube and the structure for sealing the support shaft insertion hole are realized by welding. Thereby, simplification of the whole structure can be achieved.

  Further, the tightening force of the fixing nut is exerted on the pipe body through the annular fitting having the tightening surface. Thereby, the support stability to the pipe body of the valve body can be further improved.

  Furthermore, a gap formed between the support shaft and the support shaft insertion hole is reduced by the annular metal fitting. Thereby, the obstruction | occlusion property of a spindle insertion hole can be improved.

  Furthermore, the annular fitting can be a simple circular ring. As a result, it is possible to easily adjust the dimensions of the support shaft insertion hole and the annular metal fitting.

  In addition, since the outer peripheral surface of the annular fitting is welded to the outer surface of the tubular wall of the tubular body, it is not necessary to perform special processing on the axial end surface of the annular fitting opposite to the tightening surface. As a result, the manufacture of the annular fitting is facilitated.

  According to a third aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the second aspect, the valve body is connected to the annular fitting by tightening the fixing nut to the bolt portion. And is fixed to the tube body. In this aspect, it is easy to secure a contact area between the valve body and the annular metal fitting by performing appropriate processing on at least one of the valve main body and the annular metal fitting. As a result, it is possible to improve the support stability of the valve body to the tube.

  According to a fourth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the second aspect, the axial end located outside the cylindrical wall of the tubular body in the annular fitting is A positioning nut portion to which the bolt portion is screwed is integrally provided, and the fixing nut is screwed to a tip portion of the bolt portion protruding outward from the positioning nut portion. The fixing nut is fastened to the positioning nut portion, and is fixed in contact with the end surface of the positioning nut portion as the fastening surface. In this aspect, the insertion position of the support shaft with respect to the annular metal fitting can be appropriately adjusted and set by appropriately setting the screwing position using the screw feeding action of the bolt portion with respect to the positioning nut portion. Therefore, it is possible to position the valve body at the approximate center of the pipe body, and the gap formed between the valve body and the pipe body can be set to be sufficiently small by making it substantially uniform over the entire circumference. It becomes.

  According to a fifth aspect of the present invention, there is provided an exhaust pipe for an internal combustion engine including the exhaust control valve according to the first aspect, wherein the pipe body is externally inserted into a support shaft of the valve body and is inserted into a support shaft insertion hole of the tube body. A collar fitting protruding outside the cylindrical wall and an elastic material having an annular plate shape, and an elastic sealing member as a sealing member superimposed on the outer cylindrical wall surface of the tubular body, and a support for the valve body. It is extrapolated to the shaft and disposed between the elastic seal member and the fixing nut, and the axial end surface on the elastic seal member side is a curved pressing surface corresponding to the outer surface of the tubular wall of the tubular body. On the other hand, the axial end surface on the fixing nut side is a planar fastening surface that extends in the direction perpendicular to the axis, and the fastening force of the fixing nut is exerted on the elastic seal member between the pressing surface and the tube body. The elastic seal member is closely attached and the inner peripheral surface of the elastic seal member is the outer peripheral surface of the color bracket A sealing clamping shoe is brought into close contact, they comprise sealing means that are configured, and wherein.

  In this aspect, the gap formed between the support shaft and the support shaft insertion hole is reduced by the collar fitting. Thereby, the obstruction | occlusion property of a spindle insertion hole can be improved.

  In particular, the pressing surface of the pressing member for sealing disposed between the fixing nut and the elastic sealing member has a curved shape corresponding to the outer surface of the tubular wall of the tubular body, and the tightening surface of the pressing member for sealing is The planar shape extends in the direction perpendicular to the axis. As a result, the tightening force of the fixing nut is exerted on the elastic seal member in a wide range between the tube body and the fixing nut, and the collar fitting and the support shaft are inserted by the effective elastic deformation action of the elastic seal member. The space between the holes and between the pressing surface of the sealing metal fitting and the outer surface of the tubular wall of the tubular body is sealed. As a result, exhaust leakage from the support shaft insertion hole through the space between the pressing member for sealing and the outer surface of the tubular wall of the tube can be effectively prevented. In addition, since the fixing nut and the seal pressing fitting are in close contact with each other on the fastening surface, exhaust leakage from the support shaft insertion hole through the space between the fixing nut and the sealing pressing fitting is effectively prevented. obtain.

  According to a sixth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the fifth aspect, an annular step surface facing the axial outer end surface of the collar fitting is formed in the seal pressing fitting. In addition, a ring-shaped sealing member made of an elastic material is inserted around the support shaft and disposed between the axially-facing surfaces of the annular step surface and the collar fitting, so that the tightening force of the fixing nut is ring-shaped. Sealed including a structure in which the ring-shaped seal member is in close contact with the seal pressing metal fitting and the collar metal fitting and the inner peripheral surface of the ring-shaped seal member is in close contact with the outer peripheral surface of the support shaft. You may employ | adopt together the aspect in which the means is comprised. In this aspect, based on the elastic deformation action of the elastic seal member, the occlusion of the support shaft insertion hole can be further improved, and the support shaft can be stably supported with respect to the tubular body.

  According to a seventh aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the sixth aspect, the annular step surface is a tapered surface that gradually increases in diameter toward the collar fitting side. This is a feature. In this aspect, the fastening force of the fixing nut is more efficiently applied to the ring-shaped seal member by the taper action of the annular step surface. As a result, the occlusion of the support shaft insertion hole and the support stability of the support shaft with respect to the tubular body can be further improved.

  According to an eighth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the first aspect, a sealing fitting as a sealing member is provided between the tubular wall of the tubular body and the fixing nut. The axial end surface on the fixing nut side of the sealing metal fitting is a flat fastening surface that extends in the direction perpendicular to the axis, while the axial end surface on the pipe side of the sealing metal fitting is the tubular wall of the pipe body It is a curved contact surface corresponding to the outer surface, the contact surface of the sealing metal fitting is in contact with the outer surface of the tubular wall of the tubular body using the fastening force of the fixing nut, and the outer surface of the tubular wall The outer peripheral portion of the abutting surface is welded over the entire circumference, and the space between the outer surface of the cylinder wall and the abutting surface is sealed, thereby forming a sealing means.

  In this aspect, the tightening force of the fixing nut is effectively exerted on the tubular body through the sealing fittings having surfaces corresponding to the fixing nut and the tubular body, respectively. Support stability can be further improved. Moreover, since the structure for supporting the sealing metal fitting to the tube and the sealing structure for the support shaft insertion hole are realized by welding, the overall structure can be simplified.

  According to a ninth aspect of the present invention, there is provided an exhaust pipe for an internal combustion engine including the exhaust control valve according to the eighth aspect, wherein the fixing nut and the clamping body and the valve body are between the axially opposed surfaces of the fixing nut and the fastening surface. An annular seal member made of an elastic material is disposed on at least one of the axially opposed surfaces with the support shaft attached thereto, and the fastening force of the fixing nut is exerted on the annular seal member. And the sealing means is configured to include a structure in which the annular seal member is in close contact with at least one of the fixing nut and the fastening surface and between the sealing metal fitting and the valve body. To do.

  In this aspect, in addition to the effect of preventing exhaust leakage from the support shaft insertion hole by welding the tube body and the sealing metal fitting between the sealing metal fitting and the outer surface of the tubular wall of the tube body, The effect of preventing exhaust leakage through the space between the nut and the fixing nut is obtained. As a result, the blockage of the support shaft insertion hole can be further improved.

  A tenth aspect of the present invention is used when inserting a support shaft into a support shaft insertion hole in an exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of the first to ninth embodiments. One end of the assembly lead-in wire can be locked, and the other end of the assembly lead-in wire is inserted outwardly from the inside of the tube through the support shaft insertion hole to pull it to the support shaft insertion hole. A lead-in wire locking portion for insertion is formed at the protruding tip portion of the support shaft. In this aspect, even if the tube is long, the operation of inserting the support shaft into the support shaft insertion hole is facilitated.

  According to an eleventh aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the tenth aspect, a through hole extending in a direction perpendicular to the axis is formed on the support shaft. It is characterized in that the lead-in wire locking part is configured. In this aspect, when the lead-in wire locking portion is formed, an increase in the size of the protruding tip portion of the support shaft is suppressed. Also, interference between the lead wire locking portion and the tube when inserting the support shaft into the support shaft insertion hole, interference between the lead wire locking portion and the fixing nut when fastening the bolt portion of the support shaft and the fixing nut, etc. Is suppressed. Thereby, the mounting operation of the exhaust control valve is further facilitated.

  According to a twelfth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of the first to tenth aspects, a valve main body extends from the support shaft to a protruding tip portion of the support shaft. It is characterized in that a direction mark indicating the spreading direction is attached. In this aspect, even when the valve body cannot be viewed directly from the outside of the pipe body, the rotation position of the valve body can be easily recognized with a simple structure.

  According to a thirteenth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of the first to twelfth aspects, the support shaft is engaged with a screwdriver tool at the tip surface thereof. It is characterized by having a hole. In this aspect, the fixing nut is screwed onto the bolt portion of the support shaft while the support shaft is held at a predetermined rotation position by inserting a screwing tool into the engagement hole of the support shaft. Is possible. As a result, the rotational position of the support shaft can be reliably set and held. In particular, the support shaft is provided with a bolt portion and an engagement hole, so that the protruding dimension outward in the axial direction from the threaded portion of the support shaft with the fixing nut can be suppressed, and the exhaust control valve can be made compact. Can be.

  According to a fourteenth aspect of the present invention, in the exhaust pipe for an internal combustion engine including the exhaust control valve according to any one of the first to thirteenth aspects, an unpunched lid portion is provided for the valve body. It is characterized in that a hole with a lid for adjusting the aperture ratio is formed. In this aspect, the lid portion is deformed so as to be inclined at a predetermined angle with respect to the valve body, or a plurality of types of pipe through holes having different shapes are formed by separating the lid portion from the valve body. Can be formed. As a result, the aperture ratio can be adjusted even after the basic structure of the valve body is designed. As a result, the degree of freedom in tuning the displacement can be improved.

  According to a fifteenth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of the first to fourteenth aspects, the valve body is on the side opposite to the support shaft on the extension line of the support shaft. An auxiliary support shaft that protrudes outward in the radial direction is provided, and an auxiliary support shaft insertion hole is formed in a portion of the tubular body that is opposed to the support shaft insertion hole in a direction perpendicular to the tube axis. The shaft protrudes to the outside of the tubular wall of the tube through the auxiliary support shaft insertion hole, and a cover member is attached from the outside of the tube to cover the auxiliary support shaft by covering the auxiliary support shaft insertion hole. And In this aspect, when the exhaust pressure or the like is exerted on the valve main body, the auxiliary support shaft comes into contact with the peripheral portion of the auxiliary support insertion hole, so that the axial perpendicular displacement of the support shaft is limited. Therefore, the valve main body can be stably held at a predetermined rotation position, and the stress concentration on the support shaft can be reduced to improve the durability. Moreover, it becomes possible to ensure the obstruction | occlusion property of an auxiliary | assistant spindle insertion hole with a cover member.

  According to a sixteenth aspect of the present invention, in an exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the fifteenth aspect, the auxiliary pipe has an opening length larger than the outer diameter of the auxiliary support shaft in the tube axis direction of the tubular body. A support shaft insertion hole is formed, and the valve body with the support shaft and auxiliary support shaft projecting is inserted from the opening in the axial direction of the tube so that the support shaft is inclined from the tube in the tube axis direction. The auxiliary support shaft is inserted into the auxiliary support shaft insertion hole as it is inserted into the support shaft insertion hole while being gradually raised in the direction perpendicular to the tube axis, and the auxiliary support inserted through the auxiliary support shaft insertion hole. A positioning member that positions the shaft in the tube axis direction of the tube body in a state in which the shaft can be rotated around the central axis is provided. In this aspect, the auxiliary support shaft can be supported by the tubular body via the positioning member while the auxiliary support shaft is inserted and disposed in the auxiliary support shaft insertion hole having a large opening length in the tube axis direction. As a result, it is possible to achieve both the ease of assembling the valve body including the support shaft and the auxiliary support shaft to the pipe body and the holding stability of the rotation position of the valve body.

  According to a seventeenth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of the first to sixteenth aspects, the tubular body includes a cylindrical wall portion around the support shaft insertion hole. The abutting member that abuts from the inside of the pipe extends in the direction perpendicular to the support shaft of the valve body, and the valve body comes into contact with the bolt by tightening a fixing nut. It is characterized in that it is fixed in contact with the tubular body via a member. In this aspect, the part by which the valve body is supported by the tubular body can be expanded by the contact member. As a result, it is possible to further improve the support stability of the valve body with respect to the pipe body.

  In this aspect, for example, a plurality of engagement grooves are provided in the circumferential direction of the abutting member, and the rotation position of the valve body is maintained by fitting the peripheral edge of the valve body into the engagement groove. You may make it. As a result, the holding stability of the rotation position of the valve body can be further improved.

  According to an eighteenth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the seventeenth aspect, the contact member has an arc shape that overlaps the inner peripheral surface in a cross section perpendicular to the tube axis of the tubular body. While it has an arcuate cross section consisting of an outer peripheral surface and a bottom surface extending in the chord direction of the tube body, it has a bowl-shaped block shape extending in the tube axis direction of the tube body, while the end surface in the protruding direction of the support shaft in the valve body is supported. The contact surface extends linearly in a direction perpendicular to the axis, and the contact surface is brought into contact with the bottom surface by fastening a fixing nut to the bolt portion.

  According to a nineteenth aspect of the present invention, in the exhaust pipe for an internal combustion engine including the exhaust control valve according to the seventeenth aspect, the abutting member has a spherical shell shape that overlaps the inner peripheral surface in a cross section perpendicular to the tube axis of the tubular body. When the fixing nut is tightened to the bolt portion, the spherical outer peripheral surface of the abutting member comes into contact with the inner peripheral surface of the tubular body in a region extending in the circumferential direction, and The outer peripheral surface of the valve body is in contact with the spherical inner peripheral surface of the contact member.

  According to a twentieth aspect of the present invention, in the exhaust pipe for an internal combustion engine including the exhaust control valve according to any one of the first to nineteenth aspects, the pipe bodies are divided in the pipe axis direction and connected to each other. And having a straight tube cylindrical shape having a length dimension in the tube axis direction of 30 cm or less and within 10 cm from the open end of the tube body. A support shaft insertion hole is formed in the region. In this aspect, the valve body can be relatively easily moved from the axial opening in the tube body to the mounting position. As a result, the exhaust control valve can be attached more easily.

  According to a twenty-first aspect of the present invention, in the exhaust pipe for an internal combustion engine including the exhaust control valve according to any one of the first to twentieth aspects, the pipe body integrally includes an exhaust pipe and a silencer. The structure is characterized in that a support shaft insertion hole is formed on the exhaust pipe side of the silencer and the valve body is disposed. In this aspect, the exhaust control valve can be attached more easily than when the exhaust control valve is attached inside the silencer.

  According to a twenty-second aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of the first to nineteenth aspects, the tubular body is formed into a tubular shape as a whole and is divided in the passage direction. It is constituted by a cylindrical body that interconnects the separated exhaust pipes for the internal combustion engine by being extrapolated to the exhaust pipe for the internal combustion engine, and at least one place on the circumference of the cylindrical body has a shaft An incision extending over the entire length in the direction is formed and the cylindrical main body is divided in the circumferential direction, and the divided portions protrude outward in the direction perpendicular to the axis at both end edges opposed to each other in the circumferential direction. A set of fastening portions that are superposed on each other is integrally formed, and the set of fastening portions is tightened and fixed with a plurality of fastening bolts that are mounted in a penetrating manner in the overlapping direction. As a whole That it is a characterized.

  In this aspect, since the cylindrical main body which connects the exhaust pipes for internal combustion engines to each other is divided in the circumferential direction, the diameter of the cylindrical main body is variable. Thereby, a cylindrical main body can be easily attached to the exhaust pipe for internal combustion engines divided in the passage direction in an extrapolated state.

  Moreover, a pair of fastening part is formed in at least one part of the cylindrical main body, and the pair of fastening parts are fastened and fixed to each other by a plurality of fastening bolts. Therefore, after the exhaust pipe for the internal combustion engine is inserted into the cylindrical body and then tightened with the fastening bolt, the exhaust control valve is mounted on the internal combustion engine while the inner peripheral surface of the cylindrical body is in close contact with the outer peripheral surface of the exhaust pipe for the internal combustion engine. Can be assembled to the engine exhaust pipe.

  Accordingly, the exhaust control valve can be easily attached by a simple operation at the intermediate portion in the passage direction of the exhaust pipe for the internal combustion engine while avoiding the leakage of the exhaust gas at the location of the exhaust control valve in the exhaust pipe for the internal combustion engine. I can do it.

  Furthermore, in this embodiment, the exhaust pipe for an internal combustion engine divided in the axial direction is inserted from both sides of the cylindrical main body in the axial direction to be connected to each other, whereby the axial direction of the exhaust pipe for the internal combustion engine (exhaust passage direction). An exhaust control valve is disposed in the middle portion. Therefore, troublesome work such as welding is not required when the exhaust control valve is attached to the exhaust pipe for the internal combustion engine, and a beautifully attached state can be realized.

  In addition, the cylindrical main body can be easily detached from the exhaust pipe for an internal combustion engine by loosening the fastening bolt and expanding the diameter of the cylindrical main body. This makes it possible to perform parts replacement and maintenance due to aging and the like very easily.

  According to a twenty-third aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the twenty-second aspect, a stopper plate is sandwiched between the overlapping surfaces of a set of fastening portions. At least one of the fastening bolts is also inserted through the stopper plate, and the stopper plate is fastened and fixed in a positioning state with respect to the set of fastening portions by the fastening bolt, and the stopper plate has an axial direction of the cylindrical body. A stopper projection that protrudes inward at the middle part is formed integrally, and the open ends of the exhaust pipe for the internal combustion engine inserted from both axial sides of the cylindrical main body are inserted by contact with the stopper projection, respectively. The feature is that the quantity is set.

  In this aspect, the exhaust control valve can be reliably positioned and fixed at a predetermined position of the exhaust pipe for the internal combustion engine, and the mounting operation can be speeded up and ensured. Further, it is possible to prevent the exhaust gas from leaking out at the mounting position due to the insufficient amount of insertion or the malfunction of the valve body due to the excessive amount of insertion.

  In addition, it is also possible to prepare a plurality of stopper plates with different sizes in the passage direction of the stopper protrusions and attach a stopper plate appropriately selected from the plurality of stopper plates to the cylindrical main body (fastening portion). Become. Thereby, the insertion amount of the exhaust pipe for the internal combustion engine with respect to the cylindrical main body can be easily set, and the insertion amount can be easily changed by changing the stopper plate to be selected.

  According to a twenty-fourth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to the twenty-third aspect, the stopper plate is in close contact with each other over the overlapping surface of the set of fastening portions. In addition, all of a plurality of fastening bolts mounted on a set of fastening portions penetrate through the stopper plate and are fastened and fixed. In this aspect, since the stopper plate is fixed to the fastening portion with a plurality of fastening bolts, the stopper plate can be positioned and fixed more firmly. In particular, by fixing a plurality of locations, it is possible to effectively prevent rotation using the fastening bolt as a rotation shaft.

  According to a twenty-fifth aspect of the present invention, in the exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of the twenty-second to twenty-fourth aspects, between the inner peripheral surface of the cylindrical main body and the outer peripheral surface of the exhaust pipe. It is characterized by interposing a gasket. In this aspect, it is possible to more effectively prevent the leakage of exhaust gas from the gap between the exhaust pipe for the internal combustion engine and the cylindrical main body at the installation location of the cylindrical main body.

1 is an overall schematic view of an exhaust pipe for a motorcycle including an exhaust control valve according to a first embodiment of the present invention. The principal part enlarged view of the exhaust pipe of FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. FIG. 5 is a cross-sectional view in the direction perpendicular to the tube axis showing the main part of FIG. FIG. 2 is a cross-sectional view in the tube axis direction showing one manufacturing process of the exhaust pipe of FIG. 1. FIG. 6 is a cross-sectional view in the direction perpendicular to the pipe axis showing an enlarged main part of an exhaust pipe for a motorcycle equipped with an exhaust control valve as a second embodiment of the present invention. VIII-VIII sectional drawing of FIG. FIG. 6 is a cross-sectional view in the direction perpendicular to the pipe axis showing an enlarged main part of an exhaust pipe for a motorcycle equipped with an exhaust control valve as a third embodiment of the present invention. XX sectional drawing of FIG. FIG. 9 is a cross-sectional view in the direction perpendicular to the pipe axis showing an enlarged main part of an exhaust pipe for a motorcycle equipped with an exhaust control valve as a fourth embodiment of the present invention. XII-XII sectional drawing of FIG. Fig. 10 is a cross-sectional view in the direction perpendicular to the pipe axis, showing an enlarged manufacturing process of an exhaust pipe for a motorcycle equipped with an exhaust control valve as a fifth embodiment of the present invention. The pipe axis orthogonal cross-sectional view showing an enlarged manufacturing process of an exhaust pipe for a motorcycle equipped with an exhaust control valve as a sixth embodiment of the present invention. Fig. 10 is a cross-sectional view in the direction perpendicular to the pipe axis showing an enlarged main part of an exhaust pipe for a motorcycle provided with an exhaust control valve as a seventh embodiment of the present invention. FIG. 16 is a cross-sectional view in the direction of the pipe axis of an exhaust pipe for a motorcycle including the exhaust control valve of FIG. 15. The pipe axis orthogonal direction sectional view showing the principal part expansion of the exhaust pipe for motorcycles provided with the exhaust control valve as an eighth embodiment of the present invention. XVIII-XVIII sectional drawing of FIG. FIG. 15 is an enlarged plan view of a valve body used in an exhaust pipe for a motorcycle including an exhaust control valve according to a ninth embodiment of the present invention when viewed in the tube axis direction. XX-XX cross-sectional enlarged view of FIG. The pipe axis orthogonal direction sectional view which expands and shows the principal part of the motorcycle provided with the exhaust control valve as a tenth embodiment of the present invention.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 schematically show an exhaust pipe 12 for a motorcycle as an exhaust pipe for an internal combustion engine equipped with an exhaust control valve 10 as a first embodiment of the present invention. The exhaust pipe 12 has a tubular structure made of a metal material such as stainless steel or heat-resistant steel, and integrally includes an exhaust pipe 14 and a muffler 16 as a silencer. One end of the exhaust pipe 14 is connected to an engine 18 as an internal combustion engine, and the other end is connected to a muffler 16. In the exhaust pipe 12, exhaust gas generated in the engine 18 enters the muffler 16 through the exhaust pipe 14, and is released into the atmosphere after the temperature and pressure are reduced by the muffler 16. The generated exhaust noise is suppressed. In the following description, unless otherwise specified, the tube axis direction of the exhaust pipe 12 refers to the left-right direction in FIGS. 2 and 4 and the direction perpendicular to the paper surface in FIG.

  More specifically, the exhaust pipe 14 is composed of a plurality of pipe members that are divided in the passage direction and connected to each other. In particular, a pipe member having a pipe axis dimension within 30 cm from an axial opening connected to the muffler 16 in the exhaust pipe 14 is an exhaust pipe body 20 as a pipe body having a substantially straight cylindrical shape. A support shaft insertion hole 22 is formed in a region within 10 cm from the end opening of the exhaust pipe main body 20.

  As shown in FIGS. 3 to 5, the support shaft insertion hole 22 is a substantially circular hole formed through the exhaust pipe body 20 in the direction perpendicular to the pipe axis. Further, a valve body 26 having a support shaft 24 is disposed at a portion where the support shaft insertion hole 22 of the exhaust pipe body 20 is formed.

  The support shaft 24 has a substantially cylindrical shape that is sufficiently smaller than the inner diameter of the support shaft insertion hole 22 and is formed of a metal material such as stainless steel or heat-resistant steel. A notch 28 is formed at one end of the support shaft 24 in the axial direction. On the other end side in the axial direction of the support shaft 24, a screw groove is engraved on the outer peripheral surface to constitute a bolt portion 30. Further, the bolt portion 30 is formed with a hexagonal hole 32 as an engagement hole that opens in the other axial end surface of the support shaft 24. Further, a through-hole 34 as a lead-in wire locking portion is formed through the cylindrical wall portion constituted by the bolt portion 30 and the hexagonal hole 32 in the support shaft 24 in a direction perpendicular to the axis. Furthermore, a linear direction mark 36 extending in the same direction as the uniaxial perpendicular direction in which the cut portion 28 extends is formed on the other end face in the axial direction of the support shaft 24. Such a support shaft 24 is easily manufactured by improving, for example, a commercially available hexagon socket set screw (JIS B1177) or a slotted set screw (JIS B1117).

  On the other hand, the valve body 26 has a substantially disk shape with an outer diameter smaller than the inner diameter of the exhaust pipe body 20, and is formed of a metal material such as stainless steel. One place on the circumference of the valve body 26 is inserted into the cut portion 28 of the support shaft 24 and fixed by welding or the like. As a result, the support shaft 24 protrudes radially outward from one location on the circumference of the valve body 26.

  When such a valve body 26 is accommodated in the exhaust pipe body 20, the support shaft 24 is inserted into the support shaft insertion hole 22 and protrudes outside the exhaust pipe body 20. In the present embodiment, since the direction mark 36 is attached to the support shaft 24, the rotational position of the valve body 26 can be recognized from the outside of the exhaust pipe body 20. The direction mark 36 as the rotation position display means of the valve body 26 is not limited to a linear groove as illustrated, but is configured by an arrow mark or a protrusion provided on the support shaft 24. May be.

  Further, a substantially cylindrical collar 38 is externally inserted from the projecting tip side of the support shaft 24 and is disposed between the support shaft insertion hole 22 and the radially opposing surface of the support shaft 24. In this state, one end of the collar member 38 in the axial direction is overlapped with a peripheral portion around the support shaft 24 in the valve body 26. On the other hand, the other end of the collar member 38 in the axial direction protrudes outside the exhaust pipe body 20 through the support shaft insertion hole 22.

  Further, a packing 40 as an elastic seal member (sealing member) having an annular plate shape is extrapolated from the protruding front end side of the support shaft 24 and extrapolated to the collar fitting 38, and the exhaust pipe body 20. It is overlaid on the outer peripheral surface. The packing 40 is made of, for example, a material having high heat resistance and elasticity such as a fluororesin or a silicone resin.

  Furthermore, a pressing fitting 42 as a sealing pressing fitting having a thick, generally cylindrical shape as a whole is disposed at the protruding tip portion of the support shaft 24. One end surface in the axial direction of the pressing fitting 42 is a curved pressing surface 44 corresponding to the outer peripheral surface of the exhaust pipe body 20. The other end surface in the axial direction of the pressing fitting 42 is a substantially planar fastening surface 46 extending in a direction perpendicular to the axis (the paper surface direction in FIG. 2). Further, an annular step surface 48 is formed at an axially intermediate portion of the center hole of the pressing fitting 42. The annular step surface 48 of the present embodiment has a tapered shape that gradually increases in diameter from the tightening surface 46 side toward the pressing surface 44 side. The pressing fitting 42 is extrapolated from the protruding tip side of the support shaft 24, and the pressing surface 44 is overlapped with the packing 40. Further, in this state, the protruding tip end portion of the collar fitting 38 is inserted into the pressing fitting 42 and is opposed to the annular step surface 48 of the pressing fitting 42 with a predetermined distance in the axial direction.

  In particular, an auxiliary packing 50 as a ring-shaped sealing member formed of the same material as that of the packing 40 and having an annular shape is provided between the annular step surface 48 of the pressing metal 42 and the protruding front end surface of the collar metal 38. The shaft 24 is disposed so as to be extrapolated.

  In such a state where the packing 40, the pressing fitting 42, the collar fitting 38, and the auxiliary packing 50 are overlaid, the hexagon nut 52 as a fixing nut is screwed onto the bolt portion 30 of the support shaft 24, and the pressing fitting 42 It is superimposed on the fastening surface 46. In particular, the fastening operation of the hexagon nut 52 and the bolt portion 30 is performed in a state where a hexagon wrench as a screwdriver tool (not shown) is inserted into the hexagon hole 32 of the support shaft 24. As a result, the hexagon nut 52 is screwed into the bolt portion 30 using a spanner or the like (not shown) while the rotational position of the valve body 26 is maintained. As a result, the valve body 26 is fixed to the exhaust pipe body 20 in a state where the support shaft 24 extends in one direction orthogonal to the pipe axis direction of the exhaust pipe body 20 (left and right direction in FIG. 3 or up and down direction in FIG. 4). Thus, the rotational position of the valve body 26 is set and held. As is clear from this, the fastening means is constituted by the bolt portion 30 and the hexagon nut 52.

  Further, along with the fastening of the bolt part 30 and the hexagon nut 52, the axial end surface of the hexagon nut 52 and the fastening surface 46 of the pressing fitting 42 are overlapped. Furthermore, the pressing surface 44 of the pressing fitting 42 is moved closer to the outer surface of the cylinder wall of the exhaust pipe body 20 in the axial direction of the support shaft 24, and the tightening force of the hexagon nut 52 is exerted on the packing 40. As a result, the packing 40 is compressed and deformed between the pressing surface 44 and the outer surface of the cylinder wall of the exhaust pipe main body 20 and is in close contact with both surfaces, and the inner peripheral surface of the packing 40 is in close contact with the outer peripheral surface of the collar fitting 38. . Furthermore, the annular stepped surface 48 of the pressing fitting 42 is moved closer to the protruding tip surface of the collar fitting 38 in the axial direction of the support shaft 24, and the tightening force of the hexagon nut 52 is exerted on the auxiliary packing 50. As a result, the auxiliary packing 50 is compressed and deformed between the annular step surface 48 and the protruding front end surface of the collar fitting 38 and is in close contact with both surfaces, and the inner peripheral surface of the auxiliary packing 50 is in close contact with the outer peripheral surface of the support shaft 24. Is done. As a result, the support shaft insertion hole 22 is reliably blocked from communicating with the outside through the press fitting 42 and the cylinder wall of the exhaust pipe body 20 or between the press fitting 42 and the hexagon nut 52, and the support insert hole 22. Is completely sealed against the outside of the exhaust pipe body 20. In addition, the tightening force of the hexagon nut 52 is exerted in the direction perpendicular to the collar member 38 and the support shaft 24 by the elastic deformation action of the packing 40 and the auxiliary packing 50. That is, the sealing means for sealing the support shaft insertion hole 22 includes the collar fitting 38, the packing 40, the pressing fitting 42 and the auxiliary packing 50.

  In the exhaust pipe 12 including the exhaust control valve 10 having the above-described structure, for example, a method of assembling the exhaust control valve 10 to the exhaust pipe 12 described below can be employed.

  First, a valve body 26 to which the support shaft 24 is fixed, an exhaust pipe body 20 through which the support shaft insertion hole 22 is provided, a collar fitting 38, a packing 40, a pressing fitting 42, an auxiliary packing 50, and a hexagon nut 52 are prepared. To do.

  Further, a thin steel wire 54 that can be plastically deformed is prepared as an assembly lead-in wire, and is arranged in the pipe of the exhaust pipe body 20. One end of the steel wire 54 is taken out from the axial opening of the exhaust pipe body 20, and the other end is taken out from the support shaft insertion hole 22.

  Then, one end of the steel wire 54 taken out from the axial opening of the exhaust pipe body 20 is locked to the through hole 34 of the support shaft 24, and the other end of the steel wire 54 taken out from the support shaft insertion hole 22. The end side is pulled toward the outside of the exhaust pipe body 20. As a result, the valve body 26 having the support shaft 24 is inserted from the axial opening of the exhaust pipe body 20 and moved toward the position where the support shaft insertion hole 22 is formed. At that time, the valve main body 26 provided with the support shaft 24 moves in the pipe of the exhaust pipe main body 20 with the axial direction of the support shaft 24 inclined with respect to the pipe axis direction.

  Further, in the vicinity of the position where the support shaft insertion hole 22 is formed, the support wire 24 is operated so that the support shaft 24 is gradually raised from the inclined state in the tube axis direction of the exhaust pipe body 20 in the direction orthogonal to the tube axis. A part of the tip portion of 24 is inserted into the support shaft insertion hole 22. This allows a space for raising the support shaft 24 in the direction perpendicular to the tube axis. Then, the steel wire 54 is pulled so as to rise from the support shaft insertion hole 22 in a direction substantially perpendicular to the tube axis. As a result, the valve main body 26 extends in the direction perpendicular to the pipe axis inside the exhaust pipe main body 20, and the support shaft 24 protrudes outside the exhaust pipe main body 20 from the support shaft insertion hole 22 so as to extend in the direction perpendicular to the pipe axis. The

  Thereafter, the steel wire 54 is removed from the through hole 34 of the support shaft 24. Next, the collar fitting 38 is extrapolated to the support shaft 24, and one end in the axial direction is overlaid on the outer peripheral surface of the valve body 26. In this state, the collar metal member 38 is disposed between the radially opposing surfaces of the support shaft insertion hole 22 and the support shaft 24, and the other end in the axial direction passes through the support shaft insertion hole 22 and is the cylindrical wall of the exhaust pipe body 20. It protrudes to the outside. Subsequently, the packing 40, the auxiliary packing 50, and the pressing fitting 42 are sequentially arranged in the axial direction from the protruding tip portion of the support shaft 24.

  Next, a hexagonal wrench (not shown) is inserted into the hexagonal hole 32 of the support shaft 24, and the hexagonal nut 52 is bolted using a spanner or the like (not shown) while maintaining the rotational position of the valve body 26 with respect to the exhaust pipe body 20. Screwed into the part 30. As a result, the valve body 26 is fixed to the exhaust pipe body 20 with the support shaft 24 extending in a direction perpendicular to the pipe axis of the exhaust pipe body 20. As a result, the exhaust control valve 10 in which the rotational position of the valve body 26 is set and maintained is realized. Thereafter, the exhaust pipe main body 20 provided with the exhaust control valve 10 is connected to other pipe bodies, the muffler 16 and the like constituting the exhaust pipe 14 by a fixing operation or a welding operation using a fixing band (not shown). Thereby, the exhaust pipe 12 including the exhaust control valve 10 is realized.

  In the exhaust pipe 12 including the exhaust control valve 10 having such a structure, the valve main body 26 including the support shaft 24 can be disposed at the mounting position of the exhaust pipe main body 20 by using the steel wire 54. It is possible. Accordingly, an insertion hole that allows the valve main body 26 to be inserted from the outside of the cylindrical wall of the exhaust pipe main body 20 is penetrated, or the valve main body 26 and the support shaft 24 are fixed in the pipe of the exhaust pipe main body 20. There is no need. As a result, the durability of the exhaust pipe main body 20 can be ensured and the work of attaching the exhaust control valve 10 to the exhaust pipe 12 can be facilitated.

  In addition, the pressing surface 44 has a curved shape corresponding to the outer surface of the cylinder wall of the exhaust pipe main body 20, and the tightening surface 46 of the pressing fitting 42 superimposed on the hexagon nut 52 has a planar shape extending in the direction perpendicular to the axis. ing. Thereby, the tightening force of the hex nut 52 is sufficiently exerted on the packing 40 and the auxiliary packing 50 in a wide range between the exhaust pipe main body 20 and the hex nut 52. In particular, since the annular step surface 48 is a tapered surface that gradually increases in diameter toward the collar member 38, the tightening force is more efficiently applied to the auxiliary packing 50. As a result, the gap between the press fitting 42 and the exhaust pipe body 20 and the gap between the support shaft 24 and the press fitting 42 are fluid-tightly sealed based on the effective elastic deformation action of the packing 40 and the auxiliary packing 50. obtain.

  Further, the tightening force of the hexagon nut 52 is also exerted in the direction perpendicular to the collar member 38 and the support shaft 24 by utilizing the elastic deformation action of the packing 40 and the auxiliary packing 50. Thereby, the support shaft 24 is stably supported by the exhaust pipe main body 20.

  Therefore, in the exhaust pipe 12 provided with the exhaust control valve 10 of the present embodiment, it is easy to attach the exhaust control valve 10 to the exhaust pipe 12. In addition, the rotational position of the valve body 26 is stably set and held, and the sealing performance of the support shaft insertion hole 22 is sufficiently secured, so that excellent control of the exhaust amount can be realized.

  In this embodiment, the pressing fitting 42 is not fixed to the exhaust pipe main body 20 by welding or the like, and can be separated from the exhaust pipe main body 20 by releasing the fastening of the bolt portion 30 of the support shaft 24 and the hexagon nut 52. It is said that. Therefore, the valve main body 26 can be taken out from the opening in the axial direction of the exhaust pipe main body 20 by performing an operation opposite to the operation for inserting the support shaft 24 into the support shaft insertion hole 22. Thereby, repair and replacement work of the valve main body 26 and the support shaft 24 can be realized, and maintainability can be improved.

  Several aspects different from the exhaust pipe 12 having the exhaust control valve 10 of the first embodiment will be described below with respect to the exhaust pipe for an internal combustion engine having the exhaust control valve of the present invention. In these descriptions, members and parts having substantially the same structure as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted.

  FIGS. 7 and 8 show an exhaust pipe provided with an exhaust control valve as a second embodiment of the present invention. In the present embodiment, a substantially columnar auxiliary support shaft 56 projects outward in the radial direction on the opposite side of the support shaft 24 in one radial direction of the valve body 26. Further, an auxiliary support shaft insertion hole 58 is formed through the portion of the exhaust pipe main body 20 that is positioned opposite to the support shaft insertion hole 22 in the direction orthogonal to the tube axis. The auxiliary support shaft insertion hole 58 has a long hole shape extending in the tube axis direction of the exhaust pipe main body 20, and has an opening length larger in the tube axis direction than the outer diameter of the auxiliary support shaft 56. Then, with the support shaft 24 inserted into the support shaft insertion hole 22 and extending in the direction perpendicular to the tube axis, the auxiliary support shaft 56 extends from the intermediate portion of the auxiliary support shaft insertion hole 58 in the tube axis direction to the outside of the exhaust pipe body 20. Protrusions are arranged.

  Further, a cover fitting as a cover member is provided around the auxiliary support shaft insertion hole 58 on the outer peripheral surface of the exhaust pipe main body 20 so as to cover the protruding tip portion of the auxiliary support shaft 56 separately from the outside of the exhaust pipe main body 20. 60 is fixed. In particular, in the present embodiment, a pair of positioning plate portions 62 and 62 as positioning members are formed integrally with the cover metal fitting 60 and protrude into the auxiliary support shaft insertion hole 58. The pair of positioning plate portions 62 and 62 are disposed in the auxiliary support shaft insertion hole 58 so as to face the auxiliary support shaft 56 with a slight distance on both sides in the tube axis direction. Thus, the auxiliary support shaft 56 is allowed to rotate by the edge portions on both sides in the width direction (vertical direction in FIG. 7) of the auxiliary support shaft insertion hole 58 and the pair of positioning plate portions 62 and 62. The exhaust pipe main body 20 is positioned and arranged.

  In the exhaust pipe provided with the exhaust control valve of the present embodiment, when a large exhaust pressure is exerted on the valve body 26, the auxiliary support shaft 56 abuts on the peripheral portion of the positioning plate portion 62 and the auxiliary support shaft insertion hole 58. . Thereby, the axial perpendicular displacement of the valve body 26 is limited. As a result, the target rotational position of the valve body 26 can be more advantageously held. Further, when the exhaust pressure is exerted on the valve body 26, the stress concentration of the fixed portion of the support shaft 24 with respect to the exhaust pipe body 20 is reduced, and the durability can be improved.

  Further, the auxiliary support shaft insertion hole 58 has a long hole shape extending in the tube axis direction of the exhaust pipe body 20 and has an opening length sufficiently larger in the tube axis direction than the outer diameter of the auxiliary support shaft 56. Yes. Accordingly, when the valve body 26 is moved by the same operation as in the first embodiment, the support shaft 24 is inserted into the support shaft insertion hole 22 as shown by a two-dot chain line in FIG. The auxiliary support shaft 56 can be inserted into the auxiliary support shaft insertion hole 58. Further, after the support shaft 24 and the auxiliary support shaft 56 are raised in the direction perpendicular to the tube axis, the cover fitting 60 is fixed to the exhaust pipe main body 20 so that the positioning plate portion 62 provided on the cover fitting 60 is removed. Utilizing this, the auxiliary support shaft 56 is reliably positioned in the tube axis direction.

  Next, FIGS. 9 and 10 show an exhaust pipe provided with an exhaust control valve as a third embodiment of the present invention. A contact fitting 66 as a contact member is provided between the cylindrical wall portion around the support shaft insertion hole 22 in the pipe of the exhaust pipe main body 20 and the outer peripheral surface of the valve body 26 on the side where the support shaft 24 protrudes. It is arranged. When the hexagon nut 52 is tightened, the valve main body 26 is brought into contact with and fixed to the exhaust pipe main body 20 via the contact fitting 66 without directly contacting the exhaust pipe main body 20. It has become.

  The contact fitting 66 of the present embodiment has a substantially bowl shape, and extends in the tube axis direction of the exhaust pipe main body 20 with an arc-shaped cross section having a flat bottom. The arcuate curved convex surface of the abutment metal fitting 66 has a radius of curvature that is substantially the same as the radius of curvature of the inner peripheral surface of the exhaust pipe body 20 and is overlapped with a sufficiently large area with respect to the inner peripheral surface of the exhaust pipe body 20. ing. The contact fitting 66 may be fixed to the exhaust pipe body 20 by welding or the like in contact with the exhaust pipe body 20 as necessary. In addition, an insertion hole 68 is formed in the center portion of the contact fitting 66 so as to penetrate in the thickness direction which is the direction perpendicular to the tube axis in the mounted state. The support shaft 24 is inserted into the insertion hole 68.

  Further, a portion of the outer peripheral surface of the valve body 26 where the contact fitting 66 is overlapped is a flat contact surface 64 that extends in the direction perpendicular to the axis of the support shaft 24. The flat contact surface 64 is overlapped with the bottom surface of the contact metal fitting 66 in a wide area. In particular, in this embodiment, the bottom surface of the contact fitting 66 is such that the entire contact surface 64 overlaps the bottom surface of the contact fitting 66 in a contact state regardless of the pivot position of the valve body 26. The size of is set.

  When such a contact fitting 66 is employed, when the valve body 26 is fixed to the exhaust pipe body 20, the contact area of the valve body 26 to the exhaust pipe body 20 can be set large, and the fixing strength is improved. Can be achieved. In particular, by providing the contact fitting 66, a large (indirect) contact area with the exhaust pipe main body 20 can be secured stably regardless of the rotational position of the valve main body 26. As a result, it is possible to firmly fix the valve body 26 at an arbitrary rotation position.

  Moreover, although the exhaust pipe provided with the exhaust control valve as the fourth embodiment of the present invention is shown in FIG. 11 and FIG. 12, in the present embodiment, the above-mentioned contact fitting 66 and Another embodiment of the abutment fitting 70 is employed.

  The contact fitting 70 of the present embodiment has a partial substantially spherical shell shape, a circular cap shape, or an umbrella shape, and the support shaft 24 is inserted through an insertion hole 72 that is provided on the central axis thereof. It is assembled. The spherical curved convex surface of the contact fitting 70 has a radius of curvature that is substantially the same as the radius of curvature in the circumferential direction of the inner peripheral surface of the cross section perpendicular to the axis of the exhaust pipe body 20. As a result, the outer peripheral surface of the abutment fitting 70 directly contacts the inner peripheral surface of the exhaust pipe main body 20 in a linear or belt shape extending in the circumferential direction of the exhaust pipe main body 20 with a predetermined length and overlaps. It is done. Further, the spherical curved concave surface of the contact fitting 70 has a radius of curvature that is substantially the same as the radius of curvature of the outer peripheral surface of the valve body 26 in the circumferential direction. Thereby, the outer peripheral surface of the valve main body 26 is directly contacted and overlapped with the inner peripheral surface of the contact fitting 70 in a linear or strip shape extending in the circumferential direction with a predetermined length.

  The contact fitting 70 may be fixed to one of the exhaust pipe main body 20 and the valve main body 26 by welding or the like in a contact state, if necessary.

  By adopting such a contact fitting 70, the contact area of the valve body 26 with respect to the exhaust pipe body 20 is linear or through the contact fitting 70 at any rotational position of the valve body 26. Can be stably maintained in a belt-like constant state. As a result, the valve body 26 can be positioned and fixed with a stable fixing strength at any rotational position. In particular, in a state where the valve body 26 spreads in the tube axis direction of the exhaust pipe body 20 (a state where the valve body 26 is rotated 90 degrees from the illustrated position in FIGS. There is a possibility that the tube main body 20 may be in a contact state close to hitting. Therefore, the advantage of adopting the contact fitting 70 is great.

  In short, according to the exhaust pipes of the third embodiment and the fourth embodiment described above, the contact area between the valve main body 26 and the exhaust pipe main body 20 is determined while allowing the valve main body 26 to rotate. The metal fittings 66 and 70 can be secured substantially larger. As a result, the support stability of the valve body 26 with respect to the exhaust pipe body 20 can be improved.

  Further, as in the fifth embodiment of the present invention shown in FIG. 13, the contact metal fitting 74 disposed between the tube wall portion of the exhaust pipe body 20 and the valve body 26 and the valve body 26, A holding means for the rotational position of the valve body 26 may be configured.

  The contact metal fitting 74 of this embodiment has the same basic structure as the contact metal fitting 70 of the fourth embodiment, and the outer peripheral edge portion has notched engagement grooves 76 at appropriate plural positions on the circumference. Is formed. The engagement grooves 76 are formed so as to be opposed to each other in a direction perpendicular to the central axis of the support shaft 24 to form a pair, and in this embodiment, a plurality of pairs (in this embodiment, substantially continuous in the circumferential direction). Many pairs). Any of the engaging grooves 76 opens toward the valve body 26 side. Accordingly, the outer peripheral edge of the valve body 26 has a corresponding tapered shape so as to enter the engagement groove 76. Further, the contact fitting 74 is fixed to the exhaust pipe body 20 by welding or the like.

  Then, before the hexagon nut 52 is tightened to the support shaft 24, the valve body 26 is rotated to a desired position, and the outer peripheral edge of the valve body 26 is engaged with the appropriate engagement groove 76. Can be done. In such an engaged state, the valve body 26 is positioned so as not to be rotatable relative to the contact fitting 74 and the exhaust pipe body 20. Therefore, in this embodiment, the rotational position around the support shaft 24 of the valve body 26 can be set and held more firmly than in the fourth embodiment, and the reliability can be further improved. is there.

  Further, FIG. 14 shows an exhaust pipe provided with an exhaust control valve according to a sixth embodiment of the present invention. An operation nut 78 is screwed and fixed to a distal end portion of the support shaft 24 of the present embodiment that extends outward in the axial direction from the fastening portion of the bolt portion 30 and the hexagon nut 52, and is integrated with the support shaft 24. It is designed to be rotated. A cover rubber layer 80 is attached to the outer peripheral surface of the operation nut 78.

  In order to attach the exhaust control valve provided with such an operation nut 78 to the exhaust pipe main body 20, first, the valve main body 26 provided with the support shaft 24 is attached to the exhaust pipe main body using a steel wire as in the above embodiment. Pull in through 20 open ends. Then, the support shaft 24 is projected from the support shaft insertion hole 22 to the outside of the cylindrical wall of the exhaust pipe main body 20, and the collar fitting 38, packing 40, and pressing fitting 42 are externally inserted into the support shaft 24. Thereafter, the hexagon nut 52 is screwed into the bolt portion 30 from the tip end portion of the shaft, and is arranged at the axially intermediate portion of the bolt portion 30. The valve body 26 may be fixed to the exhaust pipe main body 20 by tightening the packing 40 or the pressing fitting 42 with the hexagon nut 52 and the exhaust pipe main body 20 when the hexagon nut 52 is screwed to the bolt portion 30. . Alternatively, when the hexagon nut 52 is screwed onto the bolt portion 30, the valve body 26 and the exhaust pipe main body 20 are not fixed by not tightening the packing 40 or the pressing fitting 42 with the hexagon nut 52 and the exhaust pipe main body 20. It may be in the state.

  The operation nut 78 is screwed and fixed to the bolt portion 30 of the support shaft 24 while supporting at least one of the exhaust pipe main body 20 and the support shaft 24. Here, when the valve main body 26 and the exhaust pipe main body 20 are not fixed, the packing 40 and the pressing fitting 42 are tightened by the hexagon nut 52 and the exhaust pipe main body 20 while supporting the support shaft 24 via the operation nut 78. . Thereby, the valve body 26 and the exhaust pipe body 20 are fixed, and the exhaust control valve is attached to the exhaust pipe.

  In the exhaust control valve provided with such an operation nut 78, the valve shaft 26 is rotated around the central axis via the operation nut 78 in a state where the valve main body 26 is not fixed to the exhaust pipe main body 20, whereby the valve The opening degree adjustment of the main body 26 can be easily realized.

  In particular, in this embodiment, the operation nut 78 can be directly held and operated by the heat insulation effect and the anti-slip effect by the cover rubber layer 80 attached to the outer peripheral surface of the operation nut 78.

  In the first to sixth embodiments described above, the sealing means for the support shaft insertion hole 22 is provided between the hexagon nut 52 and the cylindrical wall around the support shaft insertion hole 22 of the exhaust pipe body 20. The press fitting 42 and the packing 40 interposed between the two are included. However, the sealing means that can be employed in the present invention is not limited to this.

  For example, in the exhaust pipe having the exhaust control valve as the seventh embodiment of the present invention shown in FIGS. 15 and 16, the sealing fitting 82 is disposed between the hexagon nut 52 and the exhaust pipe body 20. Has been. The sealing fitting 82 is an annular fitting that is substantially the same as the pressing fitting 42 of the above embodiment. In particular, the end surface in the axial direction on the exhaust pipe main body side of the sealing fitting 82 is a curved contact surface 84 corresponding to the outer surface of the cylindrical wall around the support shaft insertion hole 22 in the exhaust pipe main body 20. The sealing metal fitting 82 is externally inserted on the support shaft 24 that protrudes outside from the support shaft insertion hole 22 of the exhaust pipe main body 20, and the contact surface 84 is formed on the outer surface of the cylinder wall of the exhaust pipe main body 20. It is superimposed. Further, the end surface opposite to the contact surface 84 of the sealing fitting 82 in the axial direction is a flat fastening surface 46 extending in the direction perpendicular to the axis, and is a hexagon screwed to the bolt portion 30 of the support shaft 24. Nuts 52 are overlaid. A sealing fitting 82 is fastened and fixed between the hexagon nut 52 and the exhaust pipe body 20. As a result, the contact surface 84 of the sealing fitting 82, the outer surface of the cylinder wall of the exhaust pipe main body 20, the tightening surface 46 of the sealing fitting 82, and the end face of the hexagon nut 52 are kept in close contact with each other in the axial direction. ing. Further, an auxiliary packing 50 as an annular seal member is disposed between the annular step surface 48 formed in the axially intermediate portion inside the sealing metal fitting 82 and the axially facing surface of the collar metal fitting 38. The auxiliary packing 50 fluid-tightly seals between the sealing fitting 82 and the support shaft 24 by elastic deformation based on the tightening force of the hexagon nut 52.

  Furthermore, the outer peripheral portion of the overlapping surface of the contact surface 84 of the sealing fitting 82 and the outer surface of the cylinder wall of the exhaust pipe body 20 is welded over the entire periphery. As a result, the sealing fitting 82 is fixed to the exhaust pipe main body 20 and the space between the contact surface 84 and the outer surface of the cylindrical wall is sealed fluid-tight to the external space. As is clear from this, in this embodiment, the outer peripheral portion of the overlapping surface of the contact surface 84 of the sealing fitting 82 and the outer surface of the cylinder wall of the exhaust pipe main body 20 is welded over the entire circumference. The auxiliary packing 50 seals the space between the sealing fitting 82 and the support shaft 24 in a fluid-tight manner, thereby forming a sealing means.

  Therefore, according to the present embodiment, using the sealing fitting 82 welded to the exhaust pipe main body 20, the support stability of the valve main body 26 to the exhaust pipe main body 20 and the sealing performance of the support shaft insertion hole 22 are ensured. obtain. Moreover, since it is not necessary to arrange the packing 40 between the pressing fitting 42 and the exhaust pipe body 20 as in the above embodiment, the number of parts can be reduced.

  Moreover, in the exhaust pipe provided with the exhaust control valve according to the eighth embodiment of the present invention shown in FIGS. 17 and 18, the exhaust pipe is divided in the passage length direction in the vicinity of the connection portion with the muffler 16. A cylindrical main body 86 for connecting 12a and 12b to each other is provided. The tubular main body 86 as a whole has a substantially cylindrical shape slightly larger in diameter than the exhaust pipes 12a and 12b, and is formed of stainless steel in the present embodiment. Further, the cylindrical main body 86 is formed with a notch 88 extending linearly at one place on the circumference. The incision 88 extends continuously over the entire axial length of the cylindrical main body 86, and the cylindrical main body 86 is divided at one place in the circumferential direction by the incision 88, so that the cylindrical main body 86 is substantially constant C-shaped. The cross section extends in the axial direction. Moreover, the cylindrical main body 86 can change the diameter by applying an external force because the cut 88 is formed.

  Further, a pair of fastening portions 90, 90 projecting outward in one direction perpendicular to the axis are integrally formed at both ends in the circumferential direction of the cylindrical main body 86 where the cuts 88 are formed. The fastening portion 90 has a rectangular plate shape, and is formed over the entire length in the axial direction at the divided portion of the cylindrical main body 86. Further, a plurality of bolt insertion holes 92 are formed through the fastening portion 90 at equal intervals in the axial direction. Further, in a state where no external force is acting, the pair of fastening portions 90, 90 formed at both ends in the circumferential direction of the cylindrical main body 86 are opposed to each other with a slight gap in the circumferential direction of the cylindrical main body 86. Has been.

  A stopper plate 94 is disposed between the opposing surfaces of the pair of fastening portions 90, 90. The stopper plate 94 has a thin flat plate shape and is formed of a rigid material such as stainless steel. In particular, in the present embodiment, the stopper plate 94 is formed with substantially the same size and shape as the fastening portion 90. A bolt insertion hole 96 is formed in the stopper plate 94 at a position corresponding to the bolt insertion hole 92 formed in the fastening portion 90 in a state of being sandwiched between the opposing surfaces of the pair of fastening portions 90, 90. In addition, a pair of stopper protrusions 98 and 98 that protrude to one side in the width direction perpendicular to the longitudinal direction of the stopper plate 94 are provided in the middle portion in the longitudinal direction of the stopper plate 94. Each stopper protrusion 98 has a triangular shape. Particularly in this embodiment, of the two side surfaces forming each stopper protrusion 98, the side surface on the outer side in the longitudinal direction of the stopper plate 94 is a vertical side surface extending in the width direction of the stopper plate 94. The other side surface is an inclined side surface that is inclined in the longitudinal direction of the stopper plate 94. The inclined side surface is located closer to the longitudinal center side of the stopper plate 94 than the vertical side surface. The separation distance between the pair of stopper protrusions 98 and 98 is set to be the separation distance between the exhaust pipes 12a and 12b to be mounted.

  Such a stopper plate 94 is attached to the cylindrical main body 86 in a state of being sandwiched between opposing surfaces of the pair of fastening portions 90, 90. Between the stopper plate 94 and the fastening portions 90, 90, rectangular plate-shaped seal rubbers 100, 100 are disposed. A bolt insertion hole 102 is formed in the seal rubber 100 at a position corresponding to the bolt insertion hole 92 formed in the fastening portion 90 and the bolt insertion hole 96 formed in the stopper plate 94.

  Then, in a state where the fastening portions 90, 90, the stopper plate 94, and the seal rubber 100, 100 are overlapped over the entire surface, the bolt insertion holes 92, 96, 102, 96, Fastening bolts 104 are inserted into 92. The fastening bolt 104 is screwed to a fastening nut 106 that is superimposed on the fastening portion 90 from the other side in the thickness direction of the fastening portions 90 and 90. Accordingly, the fastening portions 90 and 90 are connected in the circumferential direction by the fastening bolt 104 so that the cylindrical main body 86 has a cylindrical shape as a whole, and the stopper plate 94 is disposed between the opposing surfaces of the pair of fastening portions 90 and 90. The fluid-tight positioning is fixed. In the present embodiment, all of the three fastening bolts 104 pass through the stopper plate 94.

  Further, in a state where the stopper plate 94 is assembled to the cylindrical main body 86, the stopper protrusions 98, 98 are protruded by a predetermined length on the radially inner side of the cylindrical main body 86. Further, the protrusion amounts of the stopper protrusions 98 and 98 are set so that the stopper protrusions 98 and 98 do not come into contact with the valve body 26 and the rotation of the valve body 26 is not prevented. In particular, in the present embodiment, the inclined side surfaces of the stopper protrusions 98 and 98 having a right triangle shape are located on the inner side in the tube axis direction of the cylindrical main body 86, so that the stopper protrusions 98 and 98 of the valve main body 26 are moved to. Can be efficiently avoided.

  Furthermore, a support shaft insertion hole 22 is formed in the cylindrical main body 86 at a position facing the notch 88 in the radial direction. An annular fitting 108 as a sealing member is inserted into the support shaft insertion hole 22 and protrudes to the outside of the cylindrical main body 86. In this state, the outer peripheral surface of the annular metal fitting 108 is in contact with the inner peripheral surface of the support shaft insertion hole 22. The outer peripheral surface of the annular metal fitting 108 and the inner peripheral surface of the support shaft insertion hole 22 do not need to be in contact with each other, and a slight gap is formed between the outer peripheral surface of the annular metal fitting 108 and the inner peripheral surface of the support shaft insertion hole 22. May be formed. Further, the annular metal fitting 108 is externally inserted into the support shaft 24 that is arranged to project outside from the support shaft insertion hole 22 of the cylindrical main body 86. In this state, the inner peripheral surface of the annular metal fitting 108 is not in contact with the outer peripheral surface of the support shaft 24, and a slight gap is formed between the radially opposite surfaces of the annular metal fitting 108 and the support shaft 24.

  Further, the outer peripheral surface of the annular metal fitting 108 is welded to the entire outer periphery of the cylindrical main body 86. As a result, the annular fitting 108 is fixed to the cylindrical body 86, and the space between the outer peripheral surface of the annular fitting 108 and the inner peripheral surface of the support shaft insertion hole 22 is sealed in a fluid-tight manner with respect to the external space. Yes. As is clear from this, in this embodiment, the outer peripheral surface of the annular metal fitting 108 is welded to the outer peripheral surface of the cylindrical main body 86 over the entire periphery, so that a sealing means is configured. .

  Furthermore, the axial end surface located outside the cylindrical main body 86 among the axial end surfaces of the annular metal fitting 108 is a flat fastening surface 46 extending in the direction perpendicular to the axis, and is attached to the bolt portion 30 of the support shaft 24. Screwed hexagon nuts 52 are overlaid. Then, by tightening the hexagon nut 52 to the bolt part 30, the tightening surface 46 of the annular metal fitting 108 and the end surface of the hexagon nut 52 are held in close contact in the axial direction. Further, the valve body 26 is in contact with the annular metal fitting 108 in a state where the hexagon nut 52 is tightened to the bolt portion 30.

  In this embodiment, since the axial length of the cylindrical main body 86 is sufficiently shortened, the support shaft 24 of the valve main body 26 is supported by the cylindrical main body 86 using the steel wire 54 as in the above-described embodiment. It is not necessary to pass through the shaft insertion hole 22. For example, with a suitable tool such as pliers or directly by hand, the valve body 26 is cylindrical with the axial direction of the support shaft 24 inclined with respect to the tube axis direction of the cylindrical main body 86. Insert into the tube of the body 86. Then, in the vicinity of the position where the support shaft insertion hole 22 is formed, the support shaft 24 is gradually raised from the inclined state with respect to the tube axis direction of the cylindrical main body 86 in the direction orthogonal to the tube axis, and the tip end portion of the support shaft 24 is moved to the support shaft insertion hole. 22 is inserted. This allows a space for raising the support shaft 24 in the direction perpendicular to the tube axis. Thereafter, the support shaft 24 is further raised in the direction perpendicular to the tube axis, so that the valve body 26 is expanded in the tube shaft orthogonal direction inside the tubular body 86 and the support shaft 24 extends in the direction perpendicular to the tube axis. It protrudes from the shaft insertion hole 22 to the outside of the cylindrical main body 86. In this way, after the support shaft 24 is inserted into the support shaft insertion hole 22, the annular fitting 108 is externally inserted into the support shaft 24, and the annular fitting 108 is disposed between the radially opposing surfaces of the support shaft 24 and the support shaft insertion hole 22. Set up. Then, the outer peripheral surface of the annular metal fitting 108 and the cylindrical wall outer surface of the cylindrical main body 86 are welded over the entire periphery. Thereby, the cylindrical main body 86 provided with the exhaust control valve is obtained.

  The cylindrical main body 86 having the exhaust control valve as described above is attached to an intermediate portion in the passage direction of the exhaust pipe 12. Specifically, the exhaust pipe 12 is cut at the middle portion in the length direction in the vicinity of the connection portion with the muffler 16, a part of the exhaust pipe 12 is cut out over a predetermined length, and the exhaust pipe 12 is cut in the length direction. Divide by (passage direction). The tubular main body 86 is disposed at the divided portion, and the exhaust pipes 12a and 12b divided from both sides in the axial direction are inserted into the cylindrical main body 86. Thus, the exhaust control valve is disposed on the exhaust passage. A liquid gasket may be applied in advance to the inner peripheral surface of the cylindrical main body 86 and the outer peripheral surface of the portion where the exhaust pipes 12a and 12b are inserted into the cylindrical main body 86. Thereby, the cylindrical main body 86 can be fluid-tightly attached to the exhaust pipes 12a and 12b.

  In particular, the cylindrical main body 86 has a shape divided at one place in the circumferential direction, and a pair of fastening portions 90, 90 formed at the divided portion are fastened by the fastening bolts 104, so that the cylinder as a whole is formed. It is made into a shape. Moreover, the diameter of the cylindrical main body 86 can be enlarged by loosening the fastening bolt 104 to weaken the fastening force and applying an external force. Therefore, the exhaust pipes 12a and 12b are inserted into the cylindrical main body 86 with the fastening bolts 104 loosened and the cylindrical main body 86 expanded, and then the fastening bolts 104 are tightened to It can be easily attached to the exhaust pipes 12a and 12b in an extrapolated state.

  Further, it is desirable that the inner diameter of the cylindrical main body 86 is substantially equal to the outer diameter of the exhaust pipes 12a and 12b or slightly smaller than the outer diameter of the exhaust pipes 12a and 12b. Thereby, it is possible to prevent leakage of the exhaust gas flowing through the exhaust passage in a state where the cylindrical main body 86 is attached to the exhaust pipes 12a and 12b. Even if the inner diameter of the cylindrical main body 86 is set in this way, the cylindrical main body 86 can be expanded and contracted, so that the cylindrical main body 86 can be easily attached to the exhaust pipes 12a and 12b. In addition, the close contact between the cylindrical main body 86 and the exhaust pipes 12a and 12b can be realized.

  Further, the opening end surfaces of the exhaust pipes 12a and 12b inserted from both axial sides of the cylindrical main body 86 abut against the stopper projections 98 and 98 from the outside in the axial direction, respectively, and the exhaust pipes 12a and 12b are axially connected. It is positioned at a predetermined position in the direction. Accordingly, when the exhaust pipes 12a and 12b are inserted into the cylindrical main body 86, the amount of insertion of the exhaust pipes 12a and 12b into the cylindrical main body 86 is easily determined by the separation distance between the pair of stopper protrusions 98 and 98. It is prescribed. As a result, the exhaust control valve 10 can be easily attached to a predetermined position of the exhaust pipe 12.

  The axial distance between the exhaust pipe 12a and the exhaust pipe 12b is set so that the rotation of the valve body 26 is not prevented by the insertion of the exhaust pipes 12a and 12b. The separation distance between the stopper protrusions 98 and 98 is appropriately set according to the required separation distance between the exhaust pipe 12a and the exhaust pipe 12b in the axial direction. Further, since a part of the exhaust pipe 12 is cut in advance with an axial length equal to the separation distance between the stopper protrusions 98, 98, a change in the length of the exhaust passage is avoided.

  In the exhaust pipe having the exhaust control valve of the present embodiment, the annular metal fitting 108 welded to the cylindrical main body 86 is used to stabilize the support of the valve main body 26 to the cylindrical main body 86 and the support shaft insertion hole 22. Sealability can be ensured.

  In particular, in this embodiment, since the hex nut 52 is in direct contact with the annular metal fitting 108, it is possible to easily improve the tightening force of the hex nut 52. As a result, it is possible to further stabilize the state in which the valve main body 26 is supported by being abutted and fixed to the cylindrical main body 86.

  Further, since the support shaft insertion hole 22 is sealed by welding the cylindrical main body 86 and the annular metal fitting 108, the number of parts necessary for sealing the support shaft insertion hole 22 can be reduced.

  Furthermore, since the annular metal fitting 108 is simply welded to the cylindrical main body 86 while being inserted into the support shaft insertion hole 22, the annular metal fitting 108 can be formed into a simple circular block shape or a cylindrical shape. I can do it. Therefore, manufacture of the annular metal fitting 108 becomes easy.

  Furthermore, since the annular metal fitting 108 is disposed between the radially opposing surfaces of the support shaft 24 and the support shaft insertion hole 22, the gap between the support shaft 24 and the support shaft insertion hole 22 in the radial direction is reduced. Thereby, the sealing performance of the spindle insertion hole 22 can be improved.

  Moreover, the valve main body 26 used for the exhaust pipe provided with the exhaust control valve as 9th embodiment of this invention is shown by FIG.19 and FIG.20. The valve body 26 is formed with a plurality of aperture-adjusting lid holes 112 having an uncut-out lid portion 110 in the thickness direction of the valve body 26.

  For example, when the valve body 26 is subjected to press working, the opening ratio adjusting lid hole 112 may leave a continuous portion slightly over the entire circumference without being completely punched, or may be partially on the circumference. It can be formed by leaving a continuous part. Then, an external force is applied to the unpunched lid portion 110 in the aperture ratio adjusting lid-attached hole 112 with a punch or the like. As a result, for example, a user or a motor can easily perform the process of opening the aperture ratio adjusting lid-attached hole 112 with an appropriate size, or completely removing the lid 110 and completely opening it.

  Therefore, in the exhaust pipe 12 including the exhaust control valve using the valve body 26 with the opening ratio adjusting lid hole 112 of the present embodiment, the plate of the valve body 26 according to the required exhaust efficiency or the like. An adjustment hole penetrating in the thickness direction can be formed. Specifically, for example, as shown by a two-dot chain line in FIG. 20, an adjustment hole is formed by plastically deforming the lid portion 110 from the opening ratio adjusting lid hole 112 toward the outside in the plate thickness direction. I can do it. The adjustment hole can also be formed by completely punching the lid part 110 and separating it from the valve body 26. This makes it easy to adjust the exhaust efficiency and adjust the output characteristics, combustion state, etc. of the internal combustion engine to be mounted.

  As mentioned above, although several embodiment of this invention has been explained in full detail, this invention is not limited at all by the specific description in these embodiment. The present invention can be implemented in a mode in which various changes, modifications, improvements, and the like are added based on the knowledge of those skilled in the art. Further, it goes without saying that such embodiments are all included in the scope of the present invention without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the exhaust pipe main body 20 constitutes a part of the exhaust pipe 14, but it may constitute the whole exhaust pipe or a part or all of the muffler. Further, the exhaust pipe main body may be constituted by a pipe body connecting the exhaust pipe and the muffler, a catalyst housing pipe of an exhaust pipe for an internal combustion engine, or the like.

  In the first to fifth embodiments, the valve body 26 has a flat and substantially disk shape. However, a concave portion, a convex portion, or the like may be formed on the surface or the peripheral edge. Furthermore, for example, a peripheral portion of the valve body that is opposed to the support shaft in one radial direction may be cut out or bent with respect to the axial direction of the support shaft. This suppresses interference caused by contact between the peripheral edge of the valve body and the exhaust pipe body when the valve body with the support shaft is inserted into the pipe from the axial opening of the exhaust pipe body and moved to the mounting position. Anyway.

  Furthermore, in the above-described embodiment, the support shaft 24 and the valve body 26 are formed separately and fixed to each other, but can be integrally formed by, for example, casting or press molding.

  Further, for example, in place of the packing 40 or the auxiliary packing 50 in the above embodiment, or in addition to the packing 40 or the auxiliary packing 50, there is a further difference between the pressing metal or the fastening surface of the sealing metal and the hexagon nut. A seal member may be provided. Thereby, it is also possible to further improve the sealing performance between the pressing metal or the tightening surface of the sealing metal and the hex nut.

  Furthermore, in the eighth embodiment, one stopper protrusion may be provided that is set to the same length as the separation distance in the axial direction of the exhaust pipe 12a and the exhaust pipe 12b.

  Furthermore, in the eighth embodiment, an annular seal member may be disposed between the overlapping surfaces of the annular metal fitting 108 and the hexagon nut 52. As a result, the sealing performance of the support shaft insertion hole 22 can be further improved.

  In the eighth embodiment, the exhaust pipe 12 shown in FIG. 1 may be employed instead of the cylindrical main body 86. That is, the support shaft insertion hole 22 is directly formed in the exhaust pipe 12 without dividing the exhaust pipe 12, and the support shaft 24 provided in the valve body 26 is inserted into the support shaft insertion hole 22. You may put it through. In this case, the annular fitting 108 is inserted into the support shaft insertion hole 22 after the support shaft 24 is inserted into the support shaft insertion hole 22. Then, the outer peripheral surface of the annular metal fitting 108 is welded to the opening peripheral edge portion of the support shaft insertion hole 22 of the exhaust pipe 12, and the space between the opposing surfaces of the annular metal fitting 108 and the support shaft insertion hole 22 is sealed. Is attached to the exhaust pipe 12. When inserting the support shaft 24 into the support shaft insertion hole 22, the same method as that of the first embodiment shown in FIG. 6 is preferably employed.

  Further, as shown in FIG. 21 as the tenth embodiment of the present invention, in the exhaust pipe having the exhaust control valve as the eighth embodiment, a hexagon nut 52 to which the support shaft 24 is screwed. The positioning nut may be configured by welding the ring bracket 108 to the annular fitting 108. Then, the hexagon nut 52 is welded to the annular fitting 108 to form a positioning nut, so that the insertion position of the spindle 24 with respect to the annular fitting 108 can be arbitrarily set based on the screw feeding action of the spindle 24 by the hexagon nut 52. It can be adjusted and set. That is, the valve body 26 can be positioned at the approximate center of the tubular body 86 (or the exhaust pipe 12) by appropriately setting the screwing amount of the support shaft 24 into the hexagon nut 52. As a result, it is possible to set the outer peripheral gap 122 formed between the inner periphery of the tubular main body 86 (or the exhaust pipe 12) around the valve main body 26 to be smaller.

  The hexagonal nut 52 is welded to the annular fitting 108 after the hexagonal nut 52 is screwed onto the spindle 24 inserted through the spindle insertion hole 22 and then the cylindrical body 86 (or the exhaust pipe 12) of the annular fitting 108. It can be performed before or after welding. Alternatively, the hex nut 52 may be integrally formed with the annular fitting 108, or the hex nut 52 may be previously welded to the annular fitting 108, whereby the hex nut 52 and the annular fitting 108 constitute a sealing means. . In this case, the hexagonal nut 52 is screwed onto the support shaft 24 inserted into the support shaft insertion hole 22, and then the annular fitting 108 is welded to the cylindrical main body 86 (or the exhaust pipe 12). The main body 26 can be attached.

  Further, in the present embodiment, in order to fixedly set the screwing position of the support shaft 24 with respect to the hexagon nut 52, a lock nut 120 as a fixing nut is employed. By tightening the lock nut 120, it is possible to exert an axial tightening fixing force with respect to the support shaft 24 with the hexagon nut 52, and the screwing position of the support shaft 24 and thus the support shaft of the valve body 26. It is possible to fixedly set the rotational position around 24 and the position in the exhaust pipe in the axial direction of the support shaft 24. Then, when the support shaft 24 is tightened and fixed by using the tightening fixing force of the hexagon nut 52 and the lock nut 120, the valve body 26 is attached to the cylindrical body 86 (or the exhaust pipe 12) or the annular fitting 108. It is possible to avoid contact, and it is also possible to prevent deformation of the valve body 26 and seizure to the cylindrical body 86 and the like due to exhaust gas.

  Moreover, in the said embodiment, although the specific example in which this invention was applied to the exhaust pipe for motorcycles was shown, for example in various industrial machines, such as a generator and an agricultural machine other than the exhaust pipe for motor vehicles, etc. Of course, the present invention can also be applied to an exhaust pipe for an internal combustion engine.

10: Exhaust control valve, 12: Exhaust pipe for motorcycle, 18: Engine, 20: Exhaust pipe body, 22: Support shaft insertion hole, 24: Support shaft, 26: Valve body, 30: Bolt part, 38: Color Bracket: 40: packing, 42: pressing bracket, 44: pressing surface, 46: clamping surface, 52: hexagon nut

Claims (25)

A pipe constituting at least a part of an exhaust pipe for an internal combustion engine;
Having a disk shape with an outer diameter smaller than the inner diameter of the tubular body, and a valve body disposed inside the tubular body;
A support shaft projecting radially outward in the valve body;
The valve body, which is formed through the tube wall of the tube body with an opening length larger than the outer diameter of the support shaft in the tube axis direction of the tube body, and is inserted from the axial opening portion of the tube body A support shaft insertion hole through which the support shaft can be protruded from the inclined state in the tube axis direction of the tube body while gradually rising in the direction orthogonal to the tube axis and projecting outside the tube wall of the tube body,
Seal that seals the support shaft insertion hole by using a sealing member that is inserted into the support shaft insertion hole and protrudes to the outside of the tubular wall of the tubular body. Means,
The bolt portion of the support shaft that is formed by a bolt portion formed on the support shaft and a fixing nut that is screwed to the bolt portion and protrudes to the outside from the support shaft insertion hole of the tubular body. An exhaust pipe for an internal combustion engine provided with an exhaust control valve, comprising fastening means for fastening the valve body to the pipe body by tightening the fixing nut against the pipe body .   An annular fitting as a sealing member that is externally attached to the support shaft of the valve body is disposed so as to protrude from the support shaft insertion hole to the outside of the tubular wall of the tubular body, and an outer peripheral surface of the annular fitting is disposed on the tubular body. The sealing means is configured by welding the entire outer periphery of the cylindrical wall and sealing between the outer peripheral surface of the annular fitting and the outer surface of the cylindrical wall of the tubular body. The axial end of the annular fitting located outside the tube wall of the tubular body is a fastening surface, and the fixing nut is in contact with the fastening surface in a state of being fastened to the bolt portion. An exhaust pipe for an internal combustion engine comprising the exhaust control valve according to 1.   The exhaust pipe for an internal combustion engine having the exhaust control valve according to claim 2, wherein the valve body is fixed to the pipe body by abutting the annular fitting by tightening the fixing nut to the bolt portion.   A positioning nut portion to which the bolt portion is screwed is integrally provided at an axial end located outside the tubular wall of the tubular body in the annular metal fitting, and outward from the positioning nut portion. The fixing nut is screwed to a tip portion of the bolt portion protruding to the fixing nut, and the fixing nut is tightened to the positioning nut portion, so that the positioning nut as the fastening surface is provided. An exhaust pipe for an internal combustion engine, comprising the exhaust control valve according to claim 2, which is fixed in contact with an end face of the portion. A collar fitting that is externally inserted into the support shaft of the valve main body and protrudes out of the tubular wall of the tubular body from within the support shaft insertion hole of the tubular body;
An elastic sealing member as the sealing member, which is made of an annular plate-shaped elastic material and is superimposed on the outer surface of the tubular wall of the tubular body,
It is inserted between the elastic seal member and the fixing nut so as to be fitted on the support shaft of the valve body, and the axial end surface on the elastic seal member side corresponds to the outer surface of the tubular wall of the tubular body. On the other hand, the end face in the axial direction on the side of the fixing nut is a flat fastening surface extending in the direction perpendicular to the axis, and the fastening force of the fixing nut is used as the elastic seal. A seal pressing fitting that exerts on the member to bring the elastic seal member into close contact between the pressing surface and the tubular body, and to bring the inner peripheral surface of the elastic sealing member into close contact with the outer peripheral surface of the collar fitting, An exhaust pipe for an internal combustion engine comprising the exhaust control valve according to claim 1, wherein the sealing means is configured.   An annular step surface facing the outer end surface in the axial direction of the collar member is formed in the pressing metal fitting for sealing, and a ring-shaped sealing member made of an elastic material is extrapolated to the support shaft, and the annular step surface and the It is disposed between the axially facing surfaces of the collar fitting, and the tightening force of the fixing nut is exerted on the ring-shaped sealing member, and the ring-shaped sealing member is applied to the sealing pressing fitting and the collar fitting. 6. The exhaust control valve according to claim 5, wherein the sealing means is configured to include a structure in which the ring-shaped seal member is in close contact with and is in close contact with the outer peripheral surface of the support shaft. An exhaust pipe for an internal combustion engine provided.   The exhaust pipe for an internal combustion engine provided with the exhaust control valve according to claim 6, wherein the annular stepped surface is a tapered surface that gradually increases in diameter toward the side of the collar fitting.   A sealing metal fitting as the sealing member is disposed between the tubular wall of the tubular body and the fixing nut, and an axial end surface of the sealing metal fitting on the fixing nut side extends in a direction perpendicular to the axis. On the other hand, the axial end surface on the tube side of the sealing metal fitting is a curved contact surface corresponding to the outer surface of the tubular wall of the tube, and the fastening nut is tightened. The corresponding contact surface of the sealing metal fitting is in contact with the outer surface of the tubular wall of the tubular body by using an applied force, and the outer peripheral portion of the outer surface of the tube wall and the corresponding contact surface is welded over the entire circumference. The exhaust pipe for an internal combustion engine provided with the exhaust control valve according to claim 1, wherein the sealing means is configured by sealing between the outer surface of the cylinder wall and the contact surface.   An annular seal member made of an elastic material is attached to the support shaft between at least one of the fixing nut and the clamping surface between the axially opposed surfaces and between the sealing metal fitting and the valve body. The annular sealing member is disposed in an externally inserted state, and the fastening force of the fixing fixing nut is exerted on the annular seal member, so that the annular seal member is interposed between the fixing nut and the fastening surface and the The exhaust pipe for an internal combustion engine provided with the exhaust control valve according to claim 8, wherein the sealing means is configured to include a structure that is in close contact with at least one of the sealing metal fitting and the valve body.   One end of an assembly lead wire used when the support shaft is inserted into the support shaft insertion hole can be locked, and the other end of the assembly lead wire is connected to the tubular body through the support shaft insertion hole. 10. A lead-in wire locking portion for inserting the support shaft into the support shaft insertion hole by being pulled outwardly from the inside of the support shaft is formed at a protruding tip portion of the support shaft. An exhaust pipe for an internal combustion engine comprising the exhaust control valve according to any one of the above.   11. An exhaust pipe for an internal combustion engine having an exhaust control valve according to claim 10, wherein a through hole extending in a direction perpendicular to the axis is formed in the support shaft, and the lead-in line locking portion is constituted by the through hole. .   The internal combustion engine comprising the exhaust control valve according to any one of claims 1 to 11, wherein a projecting tip portion of the support shaft is provided with a direction mark indicating a direction in which the valve main body extends from the support shaft. Exhaust pipe.   The exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of claims 1 to 12, wherein the support shaft is provided with an engagement hole for a screwdriver tool on a tip surface thereof.   The internal combustion engine provided with the exhaust control valve according to any one of claims 1 to 13, wherein a hole with a lid for adjusting an aperture ratio provided with an unpunched lid portion is formed in the valve body. Exhaust pipe.   In the valve body, an auxiliary support shaft that protrudes radially outward on the opposite side of the support shaft on an extension line of the support shaft is provided, and the support shaft is inserted in a direction perpendicular to the tube axis of the tube body. An auxiliary support shaft insertion hole is formed in a portion facing the hole, and the auxiliary support shaft protrudes outside the tubular wall of the tubular body through the auxiliary support shaft insertion hole, and from the outside of the tubular body, The exhaust pipe for an internal combustion engine provided with the exhaust control valve according to any one of claims 1 to 14, wherein a cover member that covers the auxiliary support shaft and covers the auxiliary support shaft is attached.   The valve main body in which the auxiliary support shaft insertion hole is formed with an opening length larger than the outer diameter of the auxiliary support shaft in the tube axis direction of the tube body, and the support shaft and the auxiliary support shaft are projected. Is inserted from the opening in the axial direction of the tube body, and the support shaft is inserted into the support shaft insertion hole while gradually rising from the inclined state of the tube body in the tube axis direction. With this, the auxiliary support shaft is inserted into the auxiliary support shaft insertion hole, and the tube body is rotatable in the state where the auxiliary support shaft inserted through the auxiliary support shaft insertion hole can be rotated around the central axis. An exhaust pipe for an internal combustion engine comprising the exhaust control valve according to claim 15, wherein a positioning member for positioning in the direction of the pipe axis is provided.   A contact member that comes into contact with the cylindrical wall portion around the support shaft insertion hole extends from the inside of the tube so as to extend in a direction perpendicular to the support shaft of the valve body. The exhaust according to any one of claims 1 to 16, wherein the valve body is fixed in contact with the pipe body via a corresponding contact member by tightening the fixing nut to the bolt portion. An exhaust pipe for an internal combustion engine provided with a control valve.   The abutting member has an arc-shaped cross section composed of an arc-shaped outer peripheral surface overlapping an inner peripheral surface in a cross section perpendicular to the tube axis of the tube body and a bottom surface extending in the chord direction of the tube body, and the tube axis direction of the tube body And the end face of the valve body in the protruding direction of the support shaft is a contact surface extending linearly in a direction perpendicular to the support shaft, and the bolt The exhaust pipe for an internal combustion engine having an exhaust control valve according to claim 17, wherein the fixing surface is brought into contact with the bottom surface when the fixing nut is tightened to the portion.   The abutting member has a spherical shell-like umbrella shape that overlaps the inner peripheral surface in a cross section perpendicular to the tube axis of the tubular body, and the fixing nut is tightened to the bolt portion, whereby a spherical shape of the corresponding contacting member is obtained. 18. The outer peripheral surface is in contact with the inner peripheral surface of the tubular body in a region extending in the circumferential direction, and the outer peripheral surface of the valve body is in contact with the spherical inner peripheral surface of the corresponding contact member. An exhaust pipe for an internal combustion engine comprising the exhaust control valve according to 1.   The tubular body constitutes at least one of a plurality of tubular members that are divided in the tube axis direction and connected to each other, and has a straight tube cylindrical shape having a length dimension of 30 cm or less in the tube axis direction. An internal combustion engine comprising the exhaust control valve according to any one of claims 1 to 19, wherein the support shaft insertion hole is formed in a region within 10 cm from the opening end of the tubular body. Exhaust pipe.   The tube body has a structure in which an exhaust pipe and a silencer are integrally provided, the support shaft insertion hole is formed on the exhaust pipe side of the silencer, and the valve body is disposed. An exhaust pipe for an internal combustion engine, comprising the exhaust control valve according to any one of claims 1 to 20.   The tubular body is externally inserted into the exhaust pipe for an internal combustion engine, which is tubular as a whole and divided in the passage direction, so that the separated exhaust pipe for the internal combustion engine is connected to each other. The cylindrical main body is divided in the circumferential direction by forming a notch extending over the entire length in the axial direction at least at one place on the circumference of the cylindrical main body. A pair of fastening portions that protrude outward in the direction perpendicular to the axis and overlap each other in the circumferential direction are integrally formed at both edge portions opposed to each other in the direction, and the one set of fastening portions penetrates in the overlapping direction. The exhaust control valve according to any one of claims 1 to 19, wherein the tubular main body is formed into a tubular shape as a whole by being fastened and fixed by a plurality of fastening bolts mounted in a state. Exhaust pipe for internal combustion engine.   A stopper plate is sandwiched between the overlapping surfaces of the set of fastening portions, and at least one of the plurality of fastening bolts is also inserted through the stopper plate, and the stopper plate is attached by the fastening bolt. The stopper plate is integrally fixed to the fastening portion in a positioning state, and the stopper plate is integrally formed with a stopper protrusion that protrudes inward at an axially intermediate portion of the cylindrical body. 23. The exhaust control valve according to claim 22, wherein an insertion amount of the open end portion of the exhaust pipe for the internal combustion engine inserted from both axial sides of the cylindrical main body is set by contacting the stopper projection. An exhaust pipe for an internal combustion engine.   The stopper plate is in close contact with the entire overlapping surface of the set of fastening portions, and all of the plurality of fastening bolts attached to the set of fastening portions are connected to the stopper plate. 24. An exhaust pipe for an internal combustion engine, comprising the exhaust control valve according to claim 23, wherein the exhaust pipe is also tightened and fixed.   25. An exhaust pipe for an internal combustion engine comprising the exhaust control valve according to any one of claims 22 to 24, wherein a gasket is interposed between an inner peripheral surface of the cylindrical main body and an outer peripheral surface of the exhaust pipe for the internal combustion engine. .

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