WO2020066966A1

WO2020066966A1 - Temporary holding structure for gasket

Info

Publication number: WO2020066966A1
Application number: PCT/JP2019/037177
Authority: WO
Inventors: 川口　哲史; 直也鶴田
Original assignee: いすゞ自動車株式会社
Priority date: 2018-09-27
Filing date: 2019-09-24
Publication date: 2020-04-02
Also published as: JP2020051532A

Abstract

A temporary holding structure for a gasket, which temporarily holds a gasket (4) relative to a first circulation pipe (2) when a first V-band flange (12) of the first circulation pipe (2) and a second V-band flange (22) of a second circulation pipe (3) are connected with a V-band (5). The first circulation pipe (2) has a circulation pipe distal-end part (20) that protrudes farther to one side than the first V-band flange (12). The gasket (4) has a gasket main body part (31) and a protruding part (32) that protrudes radially inward from a partial region of the inner peripheral edge of the opening of the gasket main body part (31). The opening of the gasket main body part (31) is larger than the outer diameter of the circulation pipe distal-end part (20). The protruding part (32) of the gasket (4) is formed with a length such that when the circulation pipe distal-end part (20) is inserted into the opening of the gasket main body part (31), the protruding part contacts the outer peripheral surface (26) of the circulation pipe distal-end part (20) and undergoes elastic deformation.

Description

Temporary gasket holding structure

The present disclosure relates to a temporary holding structure for a gasket provided in a piping structure.

Patent Literature 1 discloses a pipe connection that connects a first pipe to a second pipe by tightening a C-type clamp with a gasket interposed between the first pipe and the second pipe. The part structure is described. Near the end of the first pipe, a mountain-shaped bead bulging outward in the radial direction is formed. At the end of the second pipe, a large-diameter portion slightly larger than the outer diameter of the tip end portion of the first pipe is formed at the end of the large-diameter bead. A flare is formed that expands outward and abuts the end-side tapered surface of the angle bead of the first pipe. With the gasket attached to the outer periphery of the pipe tip of the first pipe, the gasket is inserted between the large diameter portion and the pipe tip by inserting the pipe tip into the large diameter portion of the second pipe. Is press-fitted, and the connection between the first pipe and the second pipe is sealed. By axially tightening the C-type clamp with the C-type clamp attached to the outer periphery of the connection between the first pipe and the second pipe, the inner surface of the flare in the second pipe becomes the end of the chevron bead in the first pipe. It comes into a state of being strongly pressed against the side taper surface.

Japanese Patent Application Laid-Open No. 2008-19882

By the way, when two pipes (flow pipes) are connected by a C-type clamp (V-band), the gap between the end-side tapered surface of the angled bead of the first flow pipe and the inner surface of the flare of the second flow pipe. In some cases, a gasket is interposed. In this case, before the gasket disposed on the end-side tapered surface of the angle bead of the first flow pipe is sandwiched by the inner surface of the flare of the second flow pipe, the gasket is moved to the end of the angle bead of the first flow pipe. There is a possibility that it may shift or fall off from the taper surface on the part side, and there is a possibility that the workability of the connection work of the distribution pipe may be reduced. In order to prevent the gasket from falling off, it is conceivable to provide a locking portion or the like on the gasket and temporarily hold the gasket by locking it to the angle bead of the flow pipe. However, a V band is wound around the outer periphery of the angle bead Therefore, the locking portion of the gasket may interfere with the V band, and the interference with the V band may distort the gasket and reduce the sealing performance.

Accordingly, an object of the present disclosure is to provide a gasket temporary holding structure capable of suppressing interference between a gasket and a V band and temporarily holding the gasket with respect to a flow pipe.

In order to achieve the above object, a first aspect of the present invention relates to a method of forming a first V-band flange at the distal end of a first flow pipe and a second V-band flange at a distal end of a second flow pipe. When connecting by tightening with a gasket, a gasket interposed between the first V band flange of the first flow pipe and the second V band flange of the second flow pipe is connected to the first flow pipe. This is a temporary holding structure of a gasket to be temporarily held. The first flow pipe has a flow pipe tip that protrudes from the first V-band flange to one side in the axial direction of the first flow pipe. The gasket has an annular gasket main body and an elastically deformable protrusion that protrudes radially inward from a partial area of the inner peripheral edge of the opening of the gasket main body. The opening of the gasket main body of the gasket is larger than the outer diameter of the tip of the flow pipe of the first flow pipe. The protruding portion of the gasket is formed to have a length such that the protruding portion of the first flow tube is elastically deformed by being brought into contact with the outer peripheral surface of the flow tube front portion in a state where the flow tube front end portion is inserted into the opening of the gasket body portion of the gasket. .

In the above configuration, the projecting portion of the gasket is formed on the outer peripheral surface of the distal end of the flow pipe in a state where the distal end of the flow pipe of the first flow pipe is inserted into the opening of the gasket main body of the gasket. The projecting portion is elastically deformed in the inserted state because the projecting portion is formed to have a length that is elastically deformed in contact with the projecting portion, and the elastically deformed projecting portion presses the outer peripheral surface of the distal end portion of the flow pipe from the radial outside by a restoring force. For this reason, the movement of the gasket along the axial direction with respect to the distal end of the flow pipe of the first flow pipe can be suppressed by the pressing force of the protrusion, and the gasket can be temporarily held with respect to the first flow pipe. .

Further, since the protrusion of the gasket for temporarily holding the gasket with respect to the first flow pipe is projected radially inward from the inner peripheral edge of the opening of the gasket main body, the gasket is temporarily held with respect to the first flow pipe. There is no need to project a retaining portion or the like for holding from the outer peripheral edge of the gasket main body. Therefore, interference between the gasket and the V band can be suppressed.

Therefore, interference between the gasket and the V band can be suppressed, and the gasket can be temporarily held in the flow pipe.

According to a second aspect of the present invention, when the first V-band flange on the distal end side of the first flow pipe and the second V-band flange on the distal end side of the second flow pipe are fastened and connected by a V-band. And temporarily holding the gasket interposed between the first V-band flange of the first flow pipe and the second V-band flange of the second flow pipe with respect to the first flow pipe. Structure. The first distribution pipe is provided at a distal end of the distribution pipe protruding from the first V band flange to one side in the axial direction of the first distribution pipe, and at least a part of a circumferential direction of the distal end of the distribution pipe. And an open or notched tube-side locking portion. The gasket has an annular gasket main body and an elastically deformable gasket-side locking portion extending radially inward from at least a part of the inner diameter of the gasket main body. The inner diameter of the gasket main body of the gasket is larger than the outer diameter of the distal end of the flow pipe of the first flow pipe. The gasket-side engaging portion of the gasket is formed in a shape that can be engaged with the tube-side engaging portion of the first flow tube, and the gasket body is inserted into the inner diameter portion of the gasket with the first end of the gasket. The flow pipe is locked to the pipe-side locking portion while being in contact with one surface of the first V-band flange.

In the above configuration, the first flow pipe has the pipe-side locking part, and the gasket has the gasket-side locking part locked by the pipe-side locking part. The gasket-side engaging portion of the gasket is formed in a shape that can be engaged with the tube-side engaging portion of the first flow tube, and the gasket body is inserted into the inner diameter portion of the gasket with the first end of the gasket. The flow pipe is locked to the pipe-side locking portion while being in contact with one surface of the first V-band flange. For this reason, the movement of the gasket along the axial direction with respect to the leading end of the flow pipe can be prevented by the locking of the pipe-side locking part and the gasket-side locking part. It can be temporarily held in the distribution pipe.

Further, since the gasket-side locking portion for temporarily holding the gasket with respect to the first flow pipe extends radially inward from the inner diameter of the gasket main body portion, the gasket-side locking portion extends from the outer peripheral edge of the gasket main body portion. There is no need to protrude. Therefore, interference between the gasket and the V band can be suppressed.

Therefore, interference between the gasket and the V band can be suppressed, and the gasket can be temporarily held in the first flow pipe.

３A third aspect of the present invention is the gasket temporary holding structure according to the second aspect, wherein the gasket main body of the gasket has an opening larger than the outer diameter of the distal end of the flow pipe of the first flow pipe. The gasket-side locking portion of the gasket is provided in a part of the inner peripheral edge of the opening of the gasket main body.

In the above configuration, since the gasket-side locking portion is provided in a part of the inner peripheral edge of the gasket main body, the gasket-side locking portion is provided in the entire peripheral region of the inner peripheral edge of the gasket main body. Material costs can be reduced.

A fourth aspect of the present invention is the gasket temporary holding structure according to the third aspect, wherein the pipe-side locking portion moves the distal end of the flow pipe from one side in the axial direction of the first flow pipe to the other side. It is formed in the shape of a notch which is cut out toward it. The circumferential width of the gasket-side locking portion is such that when the gasket-side locking portion is inserted from one side with respect to the tube-side locking portion, both circumferential edges of the gasket-side locking portion are tube-side locking portions. Is formed to have a width in contact with both end edges in the circumferential direction.

In the above configuration, the circumferential width of the gasket-side locking portion of the gasket is such that the circumferential width of the gasket-side locking portion when the gasket-side locking portion is inserted into the tube-side locking portion of the first flow pipe. Are formed in such a width that both end edges thereof abut against both end edges in the circumferential direction of the tube side locking portion. That is, when the gasket-side locking portion is inserted into the tube-side locking portion, both circumferential edges of the gasket-side locking portion abut against the circumferential both end edges of the tube-side locking portion. The contact makes it possible to suppress the movement of the gasket along the axial direction with respect to the front end of the flow pipe of the first flow pipe, and to temporarily hold the gasket with respect to the first flow pipe.

Further, when the gasket-side locking portion is inserted into the tube-side locking portion, the circumferential both ends of the gasket-side locking portion abut against the circumferential both ends of the tube-side locking portion. The rotation (movement in the circumferential direction) of the gasket with respect to the flow pipe tip of the flow pipe is restricted by both circumferential edges of the pipe-side locking portion. Therefore, rotation of the gasket with respect to the first flow pipe in a state where the gasket is temporarily held with respect to the first flow pipe can be prevented.

According to the gasket temporary holding structure of the present disclosure, interference between the gasket and the V band can be suppressed, and the gasket can be temporarily held in the flow pipe.

FIG. 1 is a perspective view showing an exhaust pipe according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the exhaust pipe of FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 4 is a perspective view of the gasket of FIG. FIG. 5 is a cross-sectional view of an exhaust pipe according to the second embodiment. FIG. 6 is a sectional view of an exhaust pipe according to the third embodiment. FIG. 7 is a sectional view showing a modified example of the exhaust pipe. FIG. 8 is a sectional view showing another modified example of the exhaust pipe. FIG. 9 is a perspective view showing a modification of the gasket.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. The white arrows in the figure indicate the flow direction of the exhaust gas.

As shown in FIGS. 1 and 2, the gasket temporary holding structure according to the present embodiment is applied to an exhaust pipe 1 through which exhaust gas from an engine (not shown) flows. The exhaust pipe 1 includes a first exhaust pipe (first flow pipe) 2 extending from the engine side, and a second exhaust pipe (second flow pipe) 3 arranged on the exhaust downstream side of the first exhaust pipe 2. Have. A gasket 4 is disposed between the first exhaust pipe 2 and the second exhaust pipe 3 to prevent leakage of exhaust gas from between the first exhaust pipe 2 and the second exhaust pipe 3. The first exhaust pipe 2 and the second exhaust pipe 3 are connected by being fastened with a V band 5 with a gasket 4 interposed between the first exhaust pipe 2 and the second exhaust pipe 3.

As shown in FIGS. 2 and 3, the first exhaust pipe 2 has a first exhaust pipe main body 11 having a substantially cylindrical shape, and a V-band flange 12 fixed to the first exhaust pipe main body 11. The inner peripheral surface of the first exhaust pipe main body 11 defines an internal space that allows the flow of exhaust gas. The V band flange 12 of the first exhaust pipe 2 is an annular member that is tightened by the V band 5 when connecting the first exhaust pipe 2 and the second exhaust pipe 3, and has a size of an inner diameter of the V band flange 12. Is set slightly larger than the outer diameter of the first exhaust pipe main body 11. The V-band flange 12 has an opening 18 on one side in the axial direction of a space defined by the inner peripheral surface 16 thereof, and an opening 19 on the other side in the axial direction. The outer peripheral surface 17 of the V-band flange 12 has a tapered one-sided inclined outer peripheral surface 13 that expands in diameter from one side opening 18 toward the other side in the axial direction, and expands toward one side in the axial direction from the other side opening 19. A tapered other-side inclined outer peripheral surface 14, an intermediate outer peripheral surface 15 extending along the axial direction and connecting the other end of the one-side inclined outer peripheral surface 13 and one end of the other-side inclined outer peripheral surface 14; Composed of That is, the cross-sectional shape along the axial direction of the V band flange 12 is substantially trapezoidal. The V-band flange 12 has an inner end portion through which an end on the exhaust downstream side of the first exhaust pipe main body 11 (hereinafter simply referred to as a downstream end) is inserted, and a distal end 10 on the exhaust downstream side of the first exhaust pipe main body 11. The first exhaust pipe main body 11 is fixed to the first exhaust pipe main body 11 by welding in a state of being disposed on the exhaust upstream side. That is, the first exhaust pipe main body 11 has a protruding distal end (flow pipe distal end) 20 that protrudes to the exhaust downstream side from the V band flange 12. In a state where the V band flange 12 is fixed to the first exhaust pipe main body 11, one inclined outer peripheral surface 13 on one side of the V band flange 12 is located on the exhaust upstream side, and the other inclined outer peripheral surface 14 on the other side of the V band flange 12 is provided. Is located downstream of the exhaust.

As shown in FIGS. 2 to 4, the gasket 4 is a gasket formed by stamping a metal thin plate into a predetermined shape and pressing the same. The gasket 4 has a substantially annular gasket body 31 and an opening 38 of the gasket body 31. And a plurality (four in the present embodiment) of protruding portions 32 integrally extending from a part of the inner peripheral edge 36 (four regions 37 in the present embodiment) 37. The gasket main body 31 is formed in a tapered shape that increases in diameter from the other axial side of the central axis of the inner diameter portion of the gasket main body 31 toward one side. The opening 38 of the gasket main body 31 of the gasket 4 is larger than the outer diameter of the protruding tip 20 of the first exhaust pipe 2. In the present embodiment, the part of the inner peripheral edge 36 of the opening 38 of the gasket main body 31 where the plurality of protrusions 32 are provided is the inner diameter of the gasket main body 31 when the gasket main body 31 is viewed from the axial direction. A virtual straight line L2 passing through the center O of the gasket main body 31 and orthogonal to the virtual straight line L1 (including two points including a point intersecting with a virtual straight line L1 (shown by a two-dot chain line L1 in FIG. 4)). 4 (indicated by a two-dot chain line L2 in FIG. 4). That is, the intervals in the circumferential direction of the plurality of protrusions 32 are all equal. The plurality of protrusions 32 extend radially inward of the gasket main body 31 from the partial area 37 of the inner peripheral edge 36 of the opening 38 of the gasket main body 31. The protruding portion 32 of the gasket 4 is elastically deformed by abutting on the outer peripheral surface 26 of the protruding tip 20 in a state where the protruding tip 20 of the first exhaust pipe 2 is inserted into the opening 38 of the gasket main body 31 of the gasket 4. Formed. The number of the plurality of protrusions 32 is not limited to four.

As shown in FIGS. 2 and 3, the second exhaust pipe 3 has a cylindrical second exhaust pipe main body 21 having the same diameter as the first exhaust pipe main body 11, and a V band fixed to the second exhaust pipe main body 21. And a flange 22. The inner peripheral surface of the second exhaust pipe main body 21 defines an internal space that allows the flow of exhaust gas. The V band flange 22 of the second exhaust pipe 3 is a substantially cylindrical member that is tightened by the V band 5 when connecting the first exhaust pipe 2 and the second exhaust pipe 3, and has the same diameter portion 23 and the enlarged diameter portion. 24 integrally. The same-diameter portion 23 is formed in a tubular shape and extends linearly along a predetermined direction. The size of the inner diameter of the same diameter portion 23 is set slightly larger than the size of the outer diameter of the second exhaust pipe main body 21. The enlarged diameter portion 24 extends in an inversely tapered shape so as to increase in diameter from one end (one end edge) of the same diameter portion 23 in the axial direction (the predetermined direction) to one side. The V-band flange 22 is formed in a state where the end on the exhaust upstream side (hereinafter, simply referred to as an upstream end) of the second exhaust pipe main body 21 is inserted from the other side in the axial direction into the inner diameter part of the same diameter part 23. 2 It is fixed to the exhaust pipe main body 21 by welding. The exhaust upstream end of the second exhaust pipe main body 21 is disposed on the exhaust downstream side of the exhaust upstream end of the same diameter portion 23 within the same diameter portion 23 of the V-band flange 22. That is, a region where the second exhaust pipe main body 21 is not inserted is provided on the exhaust upstream side inside the same diameter portion 23. The inclination angle of the inner peripheral surface 28 of the enlarged diameter portion 24 of the V band flange 22 with respect to the outer peripheral surface 27 of the second exhaust pipe main body 21 on the exhaust upstream side in the cross section along the axial direction of the second exhaust pipe main body 21 is the first. The inclination angle on the exhaust upstream side of the other inclined outer peripheral surface 14 of the V band flange 12 of the first exhaust pipe 2 with respect to the outer peripheral surface 9 of the first exhaust pipe main body 11 in a cross section along the axial direction of the exhaust pipe main body 11. Is set to The radial distance from the outer peripheral surface 27 of the second exhaust pipe main body 21 to the tip of the enlarged diameter portion 24 of the V-band flange 22 of the second exhaust pipe 3 is the distance between the outer peripheral surface 9 of the first exhaust pipe main body 11 and the first exhaust pipe. The distance in the radial direction from the pipe 2 to the intermediate outer peripheral surface 15 of the V band flange 12 is set to be substantially the same.

As shown in FIGS. 1 and 3, the V band 5 is a band for tightening the V band flange 12 of the first exhaust pipe 2 and the V band flange 22 of the second exhaust pipe 3, and has a substantially annular shape. It has a frame member 41 and a plurality (three in this embodiment) of V-shaped members 42 fixed to the inner peripheral surface 49 of the frame member 41. The frame member 41 is formed in a substantially annular shape by curving so that the short sides of the band-shaped member are close to each other. Both ends of the frame member 41 are separated from each other in the circumferential direction, and fastening portions 43 are provided at both ends of the frame member 41, respectively. An insertion hole (not shown) is formed in each of the fastening portions 43, and the fastening bolt 6 is inserted into the insertion hole. A nut (not shown) is screwed into the tightening bolt 6 inserted through the insertion holes at both ends of the frame member 41. The plurality of V-shaped members 42 are formed in an arc shape shorter than the frame member 41, are substantially V-shaped members that extend in the circumferential direction while being recessed radially outward, and have a bottom plate portion 44 that is long in the circumferential direction. And a pair of side plate portions 45 extending radially inward from the both end portions in the width direction of the bottom plate portion 44 in a direction away from each other. The axial length (width) of the bottom plate portion 44 is slightly longer than the axial length of the intermediate outer peripheral surface 15 of the V band flange 12 of the first exhaust pipe 2. The V-shaped member 42 is arranged in series along the inner peripheral surface 49 of the frame member 41 in the circumferential direction, and in a state where the outer peripheral surface 50 of the bottom plate portion 44 is in surface contact with the inner peripheral surface 49 of the frame member 41. Fixed. The plurality of V-shaped members 42 are separated from each other in the circumferential direction.

Next, the operation of connecting the first exhaust pipe 2 and the second exhaust pipe 3 will be described.

When connecting the first exhaust pipe 2 and the second exhaust pipe 3, first, the gasket 4 is temporarily held on the first exhaust pipe 2. In order to temporarily hold the gasket 4 with respect to the first exhaust pipe 2, the projecting tip 32 of the first exhaust pipe 2 is elastically deformed radially outward by the outer peripheral surface 26 of the projecting tip 20. The part 20 is inserted into the opening 38 of the gasket main body 31 of the gasket 4 from one axial side of the gasket main body 31. Next, the gasket 4 is pushed to the exhaust upstream side of the first exhaust pipe 2, the protruding portion 32 is moved to the exhaust upstream side along the outer peripheral surface 26 of the protruding tip end portion 20, and the one side surface 35 of the gasket main body 31 is moved. The V band flange 12 is brought into surface contact with the other inclined outer peripheral surface 14 on the other side. The gasket 4 is temporarily held on the first exhaust pipe 2 by the elastically deformed projecting part 32 pressing the outer peripheral surface 26 of the projecting tip part 20 of the first exhaust pipe 2 by the restoring force.

Next, in a state where the second exhaust pipe 3 is inserted through the inner diameter of the V band 5, the projecting distal end 20 of the first exhaust pipe 2 on the exhaust downstream side of the first exhaust pipe main body 11 is connected to the second exhaust pipe 3. The gasket 4 is inserted into the same diameter portion 23 of the V band flange 22, and the other side surface 34 of the gasket main body 31 is in surface contact with the inner peripheral surface 29 of the same diameter portion 23 of the V band flange 22 of the second exhaust pipe 3. Let it. That is, the gasket 4 is interposed between the V band flange 12 of the first exhaust pipe 2 and the V band flange 22 of the second exhaust pipe 3. In this state, the exhaust downstream end of the first exhaust pipe main body 11 and the exhaust upstream end of the second exhaust pipe main body 21 are separated from each other in the axial direction.

Next, the V band 5 is arranged at a predetermined position radially outside the V band flange 12 of the first exhaust pipe 2 and the V band flange 22 of the second exhaust pipe 3. The predetermined position is such that the inner side surface 47 of the pair of side plate portions 45 of the V-shaped member 42 of the V band 5 has the inclined outer peripheral surface 13 on one side of the V band flange 12 of the first exhaust pipe 2 and the second exhaust pipe 3. And the bottom plate portion 44 of the V-shaped member 42 of the V band 5 is moved radially from the intermediate outer peripheral surface 15 of the V band flange 12 of the first exhaust pipe 2. This is the position that is separated outward. In this state, when the tightening bolt 6 of the V band 5 is tightened, the pair of side plate portions 45 of the V-shaped member 42 of the V band 5 is moved to the one side inclined outer peripheral surface 13 of the V band flange 12 of the first exhaust pipe 2. Further, the outer peripheral surface 25 of the enlarged diameter portion 24 of the V band flange 22 of the second exhaust pipe 3 is pressed radially inward. The pressing force of the V band 5 is determined by the outer peripheral surface 25 of the V-band flange 12 of the first exhaust pipe 2 and the outer peripheral surface 25 of the enlarged portion 24 of the V-band flange 22 of the second exhaust pipe 3. It acts in a direction to bring the

band flanges

12 and 22 closer to each other. Thus, the first exhaust pipe 2 and the second exhaust pipe 3 are connected.

In the above configuration, in a state where the projecting tip 20 of the first exhaust pipe 2 is inserted into the opening 38 of the gasket main body 31 of the gasket 4, the projecting tip 32 of the first exhaust pipe 2 is elastically deformed by the restoring force. The outer peripheral surface 26 of 20 is pressed from the radial outside. For this reason, the movement of the gasket 4 along the axial direction with respect to the protruding tip portion 20 of the first exhaust pipe 2 can be suppressed by the pressing force of the protruding portion 32, and the gasket 4 is temporarily held on the first exhaust pipe 2. be able to.

The projections 32 for temporarily holding the gasket 4 with respect to the first exhaust pipe 2 extend from the inner peripheral edge 36 of the opening 38 of the gasket main body 31 radially inward of the gasket main body 31. For this reason, it is not necessary to project a locking portion or the like for temporarily holding the gasket 4 with respect to the first exhaust pipe 2 from the outer peripheral edge of the gasket main body 31, so that interference between the gasket 4 and the V band 5 can be suppressed. Can be.

Therefore, interference between the gasket 4 and the V band 5 can be suppressed, and the gasket 4 can be temporarily held on the first exhaust pipe 2.

Next, a second embodiment of the present invention will be described with reference to the drawings. The temporary holding structure for a gasket according to the second embodiment is different from the first embodiment in that a groove 51 is provided in the protruding distal end portion 20 of the first exhaust pipe 2. In addition, about the structure similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 5, a groove (tube-side locking portion) that extends radially inward and extends over the entire area in the circumferential direction is formed at the exhaust upstream end of the outer peripheral surface 26 of the projecting distal end portion 20 of the first exhaust pipe 2. ) 51 is formed. The width and the depth of the groove 51 of the protruding tip 20 are set to the width and the depth into which the plurality of protruding portions (gasket-side locking portions) 32 of the gasket 4 can be inserted.

Next, the operation of temporarily holding the gasket 4 on the first exhaust pipe 2 will be described.

In order to temporarily hold the gasket 4 with respect to the first exhaust pipe 2, first, while the protrusion 32 of the gasket 4 is elastically deformed radially outward by the outer peripheral surface 26 of the projecting tip 20, the first exhaust pipe 2 The projecting distal end portion 20 of the first exhaust pipe main body 11 is inserted into the opening 38 of the gasket main body 31 of the gasket 4 from one axial side of the gasket main body 31. Next, the gasket 4 is pushed to the exhaust upstream side of the first exhaust pipe 2, and the protruding portion 32 is moved to the exhaust upstream side along the outer peripheral surface 26 of the protruding tip end portion 20, and the side surface 35 on one side of the gasket main body 31. Is brought into surface contact with the other inclined outer peripheral surface 14 on the other side of the V-band flange 12. When the side surface 35 on one side of the gasket main body 31 is brought into surface contact with the other inclined outer peripheral surface 14 on the other side of the V-band flange 12, the protrusion 32 reaches the groove 51 of the protrusion tip 20 and is restored from the elastically deformed state. And enters the groove portion 51 from the outside in the radial direction to the inside in the radial direction. As a result, the protruding portion 32 of the gasket 4 is locked in the groove 51 of the protruding distal end portion 20 of the first exhaust pipe 2, and the gasket 4 is temporarily held on the first exhaust pipe 2.

In the above configuration, the groove 51 is formed in the projecting tip 20 of the first exhaust pipe 2, the projecting part 32 is provided in the gasket 4, and the projecting tip 20 is inserted into the opening 38 of the gasket 4. The portion 32 is locked in the groove 51 of the first exhaust pipe 2. Since the groove 51 of the first exhaust pipe 2 and the projection 32 of the gasket 4 are locked, it is possible to prevent the gasket 4 from moving in the axial direction with respect to the protruding front end 20 of the first exhaust pipe 2. 4 can be temporarily held in the first exhaust pipe 2.

Therefore, interference between the gasket 4 and the V band 5 can be suppressed, and the gasket 4 can be temporarily held in the first flow pipe 2.

In the present embodiment, the groove 51 of the projecting distal end 20 of the first exhaust pipe 2 is formed over the entire circumferential direction of the outer peripheral surface 26 of the projecting distal end 20 of the first exhaust pipe 2. The region to be formed is not limited to this. For example, the groove may be formed only at the position corresponding to the protrusion 32 of the gasket 4 on the outer peripheral surface 26 of the protrusion tip 20. In this case, the rotation (movement in the circumferential direction) of the gasket 4 with respect to the protruding tip portion 20 of the first exhaust pipe 2 is prevented while the gasket 4 is temporarily held with respect to the protruding tip portion 20 of the first exhaust pipe 2. be able to.

In the present embodiment, a part of the inner peripheral edge 36 of the opening 38 of the gasket main body 31 serves as a gasket-side locking portion that locks with the groove 51 of the protruding distal end portion 20 of the first exhaust pipe 2. Although the gasket 4 has the protruding portion 32 extending radially inward from the gasket 37, the shape of the gasket-side locking portion is not limited to this. For example, as shown in FIG. 9, the gasket 4 may be provided with a substantially annular gasket-side locking portion 40 extending radially inward from the entire circumference of the inner diameter 39 of the gasket main body 31 instead of the projecting portion 32. The inner diameter 39 of the gasket main body 31 is set between the V band flange 12 of the first exhaust pipe 2 and the V band flange 22 of the second exhaust pipe 3 in a state where the first exhaust pipe 2 and the second exhaust pipe 3 are connected. The inner peripheral edge of the region to be sandwiched (gasket main body 31), which is slightly larger than the outer diameter of the projecting distal end portion 20 of the first exhaust pipe 2.

Next, a third embodiment of the present invention will be described with reference to the drawings. The temporary holding structure for a gasket according to the third embodiment is different from the first embodiment in that a notch 53 is provided in the protruding distal end portion 20 of the first exhaust pipe 2. In addition, about the structure similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 6, a plurality of (four in the present embodiment) cutouts (tube-side locking portions) 53 are formed in the protruding distal end portion 20 of the first exhaust pipe 2. The plurality of cutouts 53 are formed in a notch shape that is cutout from the edge on the other axial side (the exhaust downstream side) of the protruding tip 20 to the exhaust upstream end. The circumferential width of the plurality of cutouts 53 of the protruding tip portion 20 is slightly smaller than the circumferential width of the plurality of protrusions (gasket-side locking portions) 32 of the gasket 4. The plurality of notches 53 are provided at positions corresponding to the plurality of protrusions 32 of the gasket 4. In other words, the plurality of notches 53 are provided at positions where the intervals in the circumferential direction are all equal to each other with respect to the protruding tip portion 20.

In order to temporarily hold the gasket 4 with respect to the first exhaust pipe 2, first, the gasket 4 is inserted from the other side in the axial direction into the notch 53 of the protruding tip 20 in a state where the protruding portion 32 is elastically deformed in the circumferential direction. At the same time, the projecting distal end portion 20 of the first exhaust pipe main body 11 of the first exhaust pipe 2 is inserted into the opening 38 of the gasket main body 31 of the gasket 4 from the other axial side of the gasket main body 31. Next, the gasket main body 31 is pushed to the exhaust upstream side of the first exhaust pipe 2, and the protruding portion 32 is moved to the exhaust upstream side in the cutout 53, so that the side surface 35 on one side of the gasket main body 31 is V-band. The flange 12 is brought into surface contact with the other inclined outer peripheral surface 14. The gasket 4 is temporarily held on the first exhaust pipe 2 by the elastically deformed protruding portion 32 pressing the circumferential edges 54 of the notch 53 of the protruding tip portion 20 by the restoring force.

In the configuration described above, the projecting portion 32 of the gasket 4 is inserted from the other side in the axial direction into the cutout portion 53 of the projecting tip portion 20 in a state where the projecting portion 32 is elastically deformed in the circumferential direction. The circumferential edges 54 of the notch 53 of the portion 20 are pressed. For this reason, the movement of the gasket 4 along the axial direction with respect to the protruding distal end portion 20 of the first exhaust pipe 2 can be suppressed, and the gasket 4 can be temporarily held on the first exhaust pipe 2.

{Circle around (4)} When the protruding portion 32 of the gasket 4 is inserted into the notch 53 of the protruding tip portion 20, the circumferential both ends of the protruding portion 32 press the circumferential both ends 54 of the notch 53. That is, since both circumferential edges of the protruding portion 32 abut against the circumferential both edges 54 of the cutout portion 53, the rotation (movement in the circumferential direction) of the gasket 4 with respect to the protruding tip portion 20 of the first exhaust pipe 2. It is regulated by both circumferential edges 54 of the notch 53. Therefore, rotation of the gasket 4 with respect to the first exhaust pipe 2 in a state where the gasket 4 is temporarily held with respect to the first exhaust pipe 2 can be prevented.

In the present embodiment, the circumferential width of the plurality of notches 53 of the protruding distal end portion 20 is smaller than the circumferential width of the plurality of protrusions 32 of the gasket 4. The circumferential width of the notch 53 and the protrusion 32 is not limited to this, and the circumferential width of the notch 53 and the protrusion 32 is such that the circumferential both ends of the protrusion 32 correspond to the circumferential both ends 54 of the notch 53. Any width may be used as long as it abuts.

数 Also, the number of the plurality of notches 53 and the plurality of protrusions 32 is not limited to four.

Although the present invention has been described based on the above-described embodiment, the present invention is not limited to the content of the above-described embodiment, and can be appropriately changed without departing from the present invention. That is, other embodiments, examples, operation techniques, and the like performed by those skilled in the art based on this embodiment are all included in the scope of the present invention.

For example, in the first to third embodiments, the plurality of protrusions 32 are provided on the gasket 4, but the number of protrusions 32 is not limited to a plurality, and at least one protrusion 32 is provided on the gasket 4. It is sufficient if provided.

In the first to third embodiments, the intervals between the plurality of projections 32 of the gasket 4 are equal to each other, but the intervals between the projections 32 may be different from each other.

In the first to third embodiments, the V-band flange 12 of the first exhaust pipe 2 and the first exhaust pipe main body 11 are separated from each other, and the V-band flange 12 is fixed to the first exhaust pipe main body 11. Alternatively, the V band flange 12 of the first exhaust pipe 2 may be formed integrally with the first exhaust pipe main body 11. For example, as shown in FIG. 7, a bulged portion (V-band flange) 62 formed by bulging the first exhaust pipe (first flow pipe) 60 itself radially outward is provided downstream of the first exhaust pipe 60. The end portion 61 may be provided so as to extend over the entire peripheral area, and the bulged portion 62 may function as a V-band flange.

In the first to third embodiments, the V-band flange 22 of the second exhaust pipe 3 and the second exhaust pipe main body 21 are separated from each other, and the V-band flange 22 is fixed to the second exhaust pipe main body 21. Alternatively, the V band flange 22 of the second exhaust pipe 3 may be integrally formed with the second exhaust pipe main body 21. For example, as shown in FIG. 7, an enlarged portion (V-band flange) 64 formed by swelling the second exhaust pipe (second flow pipe) 63 radially outward is provided upstream of the second exhaust pipe 63. The end portion 65 may be provided so as to extend over the entire peripheral area, and the enlarged diameter portion 64 may function as a V band flange.

In the first to third embodiments, the V-

band flanges

12 and 22 having different shapes from each other are formed on the first exhaust pipe main body 11 of the first exhaust pipe 2 and the second exhaust pipe main body 21 of the second exhaust pipe 3. 8, the first exhaust pipe main body 77 of the first exhaust pipe (first flow pipe) 70 and the second exhaust pipe main body of the second exhaust pipe (second flow pipe) 71, as shown in FIG. V-band flanges 72 of the same shape may be fixed to 78 respectively. The V band flange 72 is an annular member, and has one opening 79 on one side in the axial direction and another opening 80 on the other side in the axial direction of a space defined on the inner peripheral surface. The inner diameter of the V band flange 72 is slightly larger than the outer diameter of the first exhaust pipe main body 77 and the second exhaust pipe main body 78. The outer peripheral surface of the V-band flange 72 has a tapered one-side inclined outer peripheral surface 75 that expands in diameter from one side opening 79 toward the other side in the axial direction, and the other side that extends radially inward from the other side opening 80. An outer peripheral surface 73 and an intermediate outer peripheral surface 74 extending along the axial direction and connecting the other end edge of the one-side inclined outer peripheral surface 75 and the radial outer end edge of the other-side outer peripheral surface 73 are provided. Two V band flanges 72 having such a shape are prepared, and one V band flange 72 is fixed to the distal end of the first exhaust pipe main body 77, and the other V band flange 72 is connected to the distal end of the second exhaust pipe main body 78. To the part. Even in this case, the first exhaust pipe 70 has a protruding distal end (flow pipe distal end) 76 that protrudes to the exhaust downstream side from the V band flange 72. Note that a pipe-side locking portion (a groove portion 81 in FIG. 8) may be provided on the outer peripheral surface of the protruding distal end portion 76 of the first exhaust pipe 70.

In the first to third embodiments, the gasket 4 is made of metal. However, the gasket 4 may be made of resin.

Further, in the first to third embodiments, the gasket temporary holding structure is applied to the exhaust pipe (flow pipe) 1, but the present invention is not limited to this, and a ventilation pipe (flow pipe) such as an air supply pipe or the like may be used. It may be applied to a liquid flow pipe (flow pipe) such as a fuel supply pipe.

This application is based on a Japanese patent application filed on Sep. 27, 2018 (Japanese Patent Application No. 2018-181898), the contents of which are incorporated herein by reference.

仮 The gasket temporary holding structure of the present invention can be widely used for distribution pipes of trucks and other vehicles.

1

exhaust pipe

2, 60, 70 first exhaust pipe (first flow pipe)
3, 63, 71 Second exhaust pipe (second flow pipe)
Reference Signs List 4 Gasket 5 V band 6

Tightening bolt

11, 77 First exhaust pipe main body 12 V band flange of first exhaust pipe 13 One-side inclined outer peripheral surface 14 Other-side inclined outer peripheral surface 15 Intermediate outer

peripheral surface

20, 76 Projecting tip (distribution) Tube tip)
21, 78 Second exhaust pipe main body 22 V band flange of second exhaust pipe 23 Same diameter part 24 Large diameter part 31 Gasket main body 32 Projection (gasket side locking part)
35 One side surface 36 Inner peripheral edge 38 Opening 41 Frame member 42 V-shaped member 43 Tightening part 44 Bottom plate part 45 Side plate part 51 Groove part (tube side locking part)
53 Notch (tube side locking part)

Claims

When the first V-band flange on the distal end side of the first flow pipe and the second V-band flange on the distal end side of the second flow pipe are fastened and connected by a V-band, A gasket temporary holding structure for temporarily holding a gasket interposed between a first V-band flange and the second V-band flange of the second flow pipe to the first flow pipe, ,
The first flow pipe has a flow pipe tip that projects to one side in the axial direction of the first flow pipe from the first V-band flange,
The gasket has an annular gasket main body, and an elastically deformable protrusion that protrudes radially inward from a partial area of the inner peripheral edge of the opening of the gasket main body,
The opening of the gasket main body of the gasket is larger than the outer diameter of the flow pipe tip of the first flow pipe,
The projecting portion of the gasket is elastically abutted on the outer peripheral surface of the tip of the flow pipe in a state where the tip of the flow pipe of the first flow pipe is inserted into the opening of the gasket body of the gasket. Temporary holding structure of gasket formed to deform length.
When the first V-band flange on the distal end side of the first flow pipe and the second V-band flange on the distal end side of the second flow pipe are fastened and connected by a V-band, A gasket temporary holding structure for temporarily holding a gasket interposed between a first V-band flange and the second V-band flange of the second flow pipe to the first flow pipe, ,
The first flow pipe has a flow pipe tip protruding from the first V-band flange to one side in the axial direction of the first flow pipe, and at least a part of the circumference of the flow pipe tip. Having an open or notched tube-side locking portion provided in the area of
The gasket has an annular gasket main body, and an elastically deformable gasket-side locking portion extending radially inward from at least a part of the inner diameter of the gasket main body,
An inner diameter of the gasket main body of the gasket is larger than an outer diameter of a tip of the flow pipe of the first flow pipe,
The gasket-side engaging portion of the gasket is formed in a shape that can be engaged with the tube-side engaging portion of the first flow tube, and the gasket is formed by inserting a front end portion of the flow tube into an inner diameter portion of the gasket. A gasket temporary holding structure that is locked by the tube-side locking portion in a state where a gasket main body is in contact with the one surface of the first V-band flange of the first flow pipe.
It is a temporary holding structure of the gasket according to claim 2,
The gasket body of the gasket has an opening that is larger than the outer diameter of the tip of the flow pipe of the first flow pipe,
The gasket-side retaining portion of the gasket is provided in a partial region of an inner peripheral edge of the opening of the gasket main body.
It is a temporary holding structure of the gasket according to claim 3,
The pipe-side locking portion is formed in a notch shape in which the front end of the flow pipe is cut out from the one side in the axial direction of the first flow pipe toward the other side,
The circumferential width of the gasket-side locking portion is such that when the gasket-side locking portion is inserted from the one side with respect to the tube-side locking portion, both circumferential edges of the gasket-side locking portion are circumferential. A temporary holding structure for a gasket formed to have a width in contact with both circumferential edges of the tube-side locking portion.