WO2020066884A1

WO2020066884A1 - Temporary holding structure for gasket

Info

Publication number: WO2020066884A1
Application number: PCT/JP2019/036939
Authority: WO
Inventors: 直也鶴田; 川口　哲史
Original assignee: いすゞ自動車株式会社
Priority date: 2018-09-27
Filing date: 2019-09-20
Publication date: 2020-04-02
Also published as: JP2020051344A

Abstract

This temporary holding structure for a gasket (4) is for, when a first V band flange (12) of a first circulation pipe (2) and a second V band flange (22) of a second circulation pipe (3) are fastened and coupled with a V band (5), temporarily holding the gasket (4) interposed between the first V band flange (12) of the first circulation pipe (2) and the second V band flange (22) of the second circulation pipe (3) with respect to the first V band flange (12) of the first circulation pipe (2). The outer peripheral surface (17) of the first V band flange (12) of the first circulation pipe (2) has a non-contact area (15) that, when being fastened with the V band (5), is spaced apart from the inner peripheral surface (46) of the V band (5) to the radially inner side. The first V band flange (12) of the first circulation pipe (2) has a pipe-side locking part (16) that is formed in the non-contact area (15). The gasket (4) has a gasket-side locking part (32) that is locked at the pipe-side locking part (16) of the first V band flange (12) of the first circulation pipe (2).

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, 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 is connected to the first flow pipe by the first flow pipe. Is a temporary holding structure for a gasket that is temporarily held on the V band flange. The outer peripheral surface of the first V-band flange of the first flow pipe is spaced radially inward from the inner peripheral surface of the V-band when the V-band is tightened to define a space between the outer peripheral surface and the inner peripheral surface of the V-band. It has a non-contact area. The first V-band flange of the first flow pipe has a concave or convex pipe-side locking portion formed in a non-contact area on the outer peripheral surface. The gasket has an annular gasket main body and a gasket-side engaging portion provided in at least a part of an outer peripheral edge of the gasket main body. The gasket-side locking portion of the gasket is configured such that the gasket main body is arranged along the surface of the first V-band flange of the first V-band flange along the distal end surface of the first V-band flange of the first V-band flange. It is locked by the side locking portion.

In the above configuration, the first V-band flange of the first flow pipe has the pipe-side locking portion, and the gasket has the gasket-side locking portion locked to the pipe-side locking portion. It can be temporarily held on the first V-band flange of one flow pipe.

The non-contact area on the outer peripheral surface of the first V-band flange of the first flow pipe is separated from the inner peripheral surface of the V-band radially inward when the V-band is tightened, and is separated from the inner peripheral surface of the V-band. A space is defined between them. For this reason, the gasket-side locking portion locked by the tube-side locking portion formed in the non-contact region forms the tube-side locking in the space between the non-contact region and the inner peripheral surface of the V band. Locked to the part. Therefore, the gasket-side locking portion can be separated radially inward from the V band, so that interference between the gasket and the inner surface of 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.

A second aspect of the present invention is the temporary holding structure for a gasket of the first aspect, wherein the pipe side locking portion of the first V-band flange of the first flow pipe has the first side of the first flow pipe. 1 is a concave tube-side locking portion that is recessed radially inward from a non-contact area on the outer peripheral surface of the V band flange. The gasket-side locking portion is provided at a position corresponding to the concave tube-side locking portion, and has a protrusion that is locked by entering the concave tube-side locking portion from the radial outside to the radial inside. Have.

In the above configuration, since the protrusion of the gasket side locking portion is locked by entering the concave tube side locking portion from the radial outside to the radial inside, the outer peripheral surface of the first V-band flange is locked. As compared with the case where the gasket-side locking portion is locked to the convex tube-side locking portion protruding radially outward from the non-contact area, the gasket-side locking portion extends radially outward from the outer peripheral surface of the first V-band flange. The protrusion of the gasket-side locking portion can be suppressed, and interference between the gasket and the inner surface of the V band can be suppressed.

The third aspect of the present invention is the gasket temporary holding structure according to the first or second aspect, wherein the gasket-side engaging portion of the gasket is provided in a partial area of the outer peripheral edge of the gasket main body.

In the above configuration, since the gasket-side locking portion is provided in a part of the outer peripheral edge of the gasket main body, the material cost of the gasket is reduced as compared with the case where the gasket-side locking portion is provided in the entire outer peripheral region of the gasket. Can be reduced.

第 A fourth aspect of the present invention is the gasket temporary holding structure of the third aspect, wherein the gasket has a plurality of gasket-side locking portions.

In the above configuration, since the gasket has the plurality of gasket-side locking portions, the gasket can be temporarily temporarily securely held to the first V-band flange of the first flow pipe.

According to the gasket temporary holding structure of the present disclosure, interference with 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 showing a modified example of the exhaust pipe. FIG. 7 is a sectional view showing another modified example of the exhaust pipe.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. 1, 3, and 5 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 on the inner peripheral surface, 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, and an intermediate outer peripheral surface (not shown) extending along the axial direction and connecting the other end edge of the one-side inclined outer peripheral surface 13 and one end edge of the other-side inclined outer peripheral surface 14. 15). That is, the cross-sectional shape along the axial direction of the V band flange 12 is substantially trapezoidal. On the intermediate outer peripheral surface 15 of the V-band flange 12, a groove portion (tube-side locking portion) 16 extending over the entire area in the circumferential direction so as to be depressed inward in the radial direction is formed. 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, at the downstream end of the first exhaust pipe main body 11, a protruding front end 20 protruding from the V band flange 12 to the exhaust downstream side is provided. 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 and 4, the gasket 4 is a gasket formed by stamping a metal thin plate into a predetermined shape and pressing the same, and has a substantially annular gasket main body 31 and an outer peripheral edge of the gasket main body 31. A plurality (four in this embodiment) of claw portions (gasket-side locking portions) 32 integrally extending from some of the regions (four regions 37 in this embodiment) 37 of the 36. The gasket main body 31 is formed in a tapered shape that increases in diameter from one axial side of the central axis of the inner diameter portion of the gasket main body 31 to the other side. In the present embodiment, the part of the outer peripheral edge 36 of the gasket main body 31 where the plurality of claw portions 32 are provided is the center of the inner diameter portion of the gasket main body 31 when the gasket main body 31 is viewed from the axial direction. A virtual straight line L2 (including a point intersecting a virtual straight line L1 passing through O (indicated by a two-dot chain line L1 in FIG. 4) and a center O of the inner diameter portion of the gasket main body 31 and orthogonal to the virtual straight line L1 ( 4 (indicated by a two-dot chain line L2 in FIG. 4). That is, the intervals between the plurality of claw portions 32 in the circumferential direction are all equal. The plurality of claw portions 32 each have an extending portion 33 and a protruding portion 34. The extension portion 33 extends from the region 37 of the outer peripheral edge 36 of the gasket main body 31 to one axial side of the gasket main body 31. The length of the extension portion 33 is substantially the same as the length from the edge on the exhaust downstream side of the intermediate outer peripheral surface 15 of the V band flange 12 of the first exhaust pipe 2 to the groove portion 16. The protruding portion 34 is bent from the tip of the extending portion 33 and extends radially inward. That is, the projecting portion 34 is provided at a position corresponding to the groove 16 of the V band flange 12 of the first exhaust pipe 2. Note that the number of the plurality of claw portions 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 claw portion 32 extends from the projecting distal end portion 20 of the first exhaust pipe main body 11 of the first exhaust pipe 2 to the opening of the gasket main body 31 of the gasket 4. The gasket main body 31 is inserted into the gasket 4 from one side in the axial direction, and the tips of the plurality of claws 32 of the gasket 4 are brought into contact with the inclined outer peripheral surface 14 on the other side of the V band flange 12 of the first exhaust pipe 2. Next, the gasket 4 is pushed toward the exhaust upstream side of the first exhaust pipe 2, and while the extension 33 of the claw 32 of the gasket 4 is elastically deformed radially outward, the projection 34 of the claw 32 is connected to the V band flange. 12 is moved to the intermediate outer peripheral surface 15 along the other inclined outer peripheral surface 14. Further, when the gasket 4 is pushed to the exhaust upstream side of the first exhaust pipe 2 and the protruding portion 34 of the claw portion 32 is moved to the exhaust upstream side along the intermediate outer peripheral surface 15 of the V band flange 12, the projection of the claw portion 32 The portion 34 reaches the groove 16 of the V-band flange 12 and enters the groove 16 from the outside in the radial direction to the inside in the radial direction due to the restoring force of the extension portion 33 of the claw portion 32. Thereby, the claw 32 of the gasket 4 is locked in the groove 16 of the V band flange 12 of the first exhaust pipe 2, and the gasket 4 is temporarily held on the first exhaust pipe 2. In a state where the gasket 4 is temporarily held with respect to the first exhaust pipe 2, one side surface 35 of the gasket main body 31 comes into surface contact with the other inclined outer peripheral surface 14 on the other side of the V-band flange 12, and the claw portion 32 extends. A portion 33 extends along the intermediate outer peripheral surface 15 of the V-band flange 12.

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 38 of the gasket main body 31 of the gasket 4 comes into surface contact with the inner peripheral surface 28 of the enlarged diameter portion 24 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 a state where the first exhaust pipe 2 and the second exhaust pipe 3 are connected by the V band 5, the intermediate outer peripheral surface 15 of the V band flange 12 of the first exhaust pipe 2 and the bottom plate portion 44 of the V-shaped member 42 of the V band 5. And the inner peripheral surface 46 of the V-band flange 12 of the first exhaust pipe 2 and the inner peripheral surface 46 of the bottom plate portion 44 of the V-shaped member 42 of the V-band 5. A space 48 is defined. The claw 32 of the gasket 4 locked in the groove 16 of the V-band flange 12 of the first exhaust pipe 2 is disposed in the space 48. The extension 33 of the claw 32 of the gasket 4 is spaced radially inward from the inner peripheral surface 46 of the bottom plate 44 of the V-shaped member 42 of the V-band 5.

In this embodiment, since the groove 16 is formed in the V band flange 12 of the first exhaust pipe 2 and the claw 32 is provided on the gasket 4, the claw 32 of the gasket 4 is engaged with the groove 16 of the V band flange 12. Thus, the gasket 4 can be temporarily held on the V band flange 12.

In a state where the first exhaust pipe 2 and the second exhaust pipe 3 are connected by the V band 5, the extension 33 of the claw 32 of the gasket 4 is connected to the bottom plate 44 of the V-shaped member 42 of the V band 5. The gasket 4 and the V-shaped member 42 of the V-band 5 do not interfere with each other because the gasket 4 is spaced radially inward from the inner peripheral surface 46.

In addition, a groove (tube-side locking portion) 16 is provided in the V band flange 12 of the first exhaust pipe 2, and the claw 32 of the gasket 4 enters the groove 16 from the outside in the radial direction to the inside in the radial direction. 1 The V band flange 12 of the exhaust pipe 2 is provided with a convex tube-side locking portion, and the claw portion 32 of the gasket 4 is locked to the pipe-side locking portion. The protrusion amount of the claw portion 32 from the outer peripheral surface 15 to the outside in the radial direction can be suppressed. For this reason, in a state where the first exhaust pipe 2 and the second exhaust pipe 3 are connected by the V-band 5, the extension 33 of the claw portion 32 is connected to the inner peripheral surface of the bottom plate 44 of the V-shaped member 42 of the V-band 5. 46 can be largely spaced radially inward.

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.

Further, since the claw portion 32 of the gasket 4 is provided in a partial area 37 of the outer peripheral edge 36 of the gasket main body 31, the gasket 32 is provided over the entire peripheral region of the outer peripheral edge of the gasket main body 31. 4 can reduce the material cost.

Further, since the gasket 4 has the plurality of claw portions 32, the gasket 4 can be temporarily held securely to the V band flange 12 of the first exhaust pipe 2, as compared with the case where only one claw portion 32 is provided. .

In the present embodiment, the groove 16 of the V-band flange 12 of the first exhaust pipe 2 is formed over the entire circumferential direction of the intermediate outer peripheral surface 15 of the V-band flange 12 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 claw 32 of the gasket 4 on the intermediate outer peripheral surface 15 of the V band flange 12. In this case, the rotation of the gasket 4 with respect to the V band flange 12 can be prevented while the gasket 4 is temporarily held with respect to the V band flange 12 of the first exhaust pipe 2.

Next, a second embodiment of the present invention will be described with reference to the drawings. The gasket temporary holding structure according to the second embodiment is different from the first embodiment in that a projection 53 is provided in place of the groove 16 in the V band flange 12 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, on the intermediate outer peripheral surface 15 of the V-band flange 12 of the first exhaust pipe 2, a protrusion (pipe-side locking part) 53 that protrudes radially outward and extends over the entire circumferential direction. Is formed.

The length of the extension portion 33 of the claw portion 32 of the gasket 4 is from the exhaust downstream end edge of the intermediate outer peripheral surface 15 of the V band flange 12 of the first exhaust pipe 2 to the exhaust upstream surface of the projection 53. Slightly longer than length. The protruding portion 34 is bent from the tip of the extending portion 33 and extends radially inward. That is, the protrusion 34 is provided at a position corresponding to the protrusion 53 of the V band flange 12 of the first exhaust pipe 2.

In a state where the first exhaust pipe 2 and the second exhaust pipe 3 are connected by the V band 5, the protrusion 53 of the V band flange 12 of the first exhaust pipe 2 is connected to the bottom plate 44 of the V-shaped member 42 of the V band 5. Is separated radially inward from the inner peripheral surface 46 of the second member. The claw portion 32 of the gasket 4 locked to the projection 53 of the V band flange 12 of the first exhaust pipe 2 is connected to the inner peripheral surface 46 of the V-shaped member 42 of the V band 5 and the V band flange 12 of the first exhaust pipe 2. Are arranged in a space 56 between the intermediate outer peripheral surface 15. The extension 33 of the claw 32 of the gasket 4 is spaced radially inward from the inner peripheral surface 46 of the bottom plate 44 of the V-shaped member 42 of the V-band 5.

In the present embodiment, since the projection 53 is formed on the V band flange 12 of the first exhaust pipe 2 and the claw 32 is provided on the gasket 4, the claw 32 of the gasket 4 is engaged with the projection 53 of the V band flange 12. Stopping, the gasket 4 can be temporarily held on the V band flange 12.

In a state where the first exhaust pipe 2 and the second exhaust pipe 3 are connected by the V band 5, the extension 33 of the claw 32 of the gasket 4 is connected to the bottom plate 44 of the V-shaped member 42 of the V band 5. Since it is spaced radially inward from the inner peripheral surface 46, the gasket 4 and the V-shaped member 42 of the V-band 5 can be moved even if the projection 53 projects radially outward from the intermediate outer peripheral surface 15 of the V-band flange 12. Does not interfere.

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.

In the present embodiment, the projection 53 of the V band flange 12 of the first exhaust pipe 2 is formed over the entire circumferential direction of the intermediate outer peripheral surface 15 of the V band flange 12 of the first exhaust pipe 2. The region in which 53 is formed is not limited to this. For example, the protrusion may be formed only at the position corresponding to the claw 32 of the gasket 4 on the intermediate outer peripheral surface 15 of the V band flange 12.

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 embodiment and the second embodiment, the gasket-side engaging portion that engages with the tube-side engaging portion (the groove 16 and the protrusion 53) of the V band flange 12 of the first exhaust pipe 2. As described above, the claw portion 32 extending to one side from the partial area 37 of the outer peripheral edge 36 of the gasket main body 31 is provided on the gasket 4, but instead of the claw portion 32, the entire peripheral area of the outer peripheral edge 36 of the gasket main body 31 is provided. The gasket 4 may be provided with a substantially cylindrical gasket-side locking portion extending from the gasket to one side.

Further, in the first and second embodiments, the gasket 4 is provided with a plurality of gasket-side locking portions (claw portions 32). However, the gasket 4 may be provided with one gasket-side locking portion. .

In the first and second embodiments, the intervals between the plurality of claws 32 of the gasket 4 are equal, but the intervals between the claws 32 may be different.

In the first embodiment and the second embodiment, the V-band flange 12 of the first exhaust pipe 2 and the first exhaust pipe main body 11 are separately provided, and the V-band flange 12 is attached to the first exhaust pipe main body 11. Although fixed, the V-band flange 12 of the first exhaust pipe 2 may be integrally formed with the first exhaust pipe main body 11. For example, as shown in FIG. 6, a bulged portion (V-band flange) 62 formed by bulging the first exhaust pipe 60 itself radially outward is provided on the downstream end 61 of the first exhaust pipe 60 over the entire circumference. , And the bulging portion 62 may function as a V band flange.

In the first embodiment and the second embodiment, the V band flange 12 of the first exhaust pipe 2 and the V band flange 22 of the second exhaust pipe 3 have different shapes, but may have substantially the same shape. . For example, as shown in FIG. 7, substantially the same V-band flange 71 may be fixed to the first exhaust pipe 70 and the second exhaust pipe 72. The V-band flange 71 is an annular V-band flange, and is provided at each of the other end (the other end) of the first exhaust pipe 70 and one end (one end) of the second exhaust pipe 72. A distal end surface portion 74 extending perpendicular to the axial direction of the

exhaust pipes

70 and 72, and an outer peripheral surface portion (non-contact area) 75 extending from the outer peripheral edge of the distal end surface portion 74 of the first exhaust pipe 70 to one side along the axial direction. An outer peripheral surface portion (non-contact area) 78 extending from the outer peripheral edge of the distal end surface portion 74 of the second exhaust pipe 72 to the other side along the axial direction, and one end (one end of one end) of the outer peripheral surface portion 75 of the first exhaust pipe 70 ) And an inclined surface portion 76 that extends in a tapered shape from the other end (the other end) of the outer peripheral surface portion 78 of the second exhaust pipe 72 toward the outer peripheral surface of each of the

exhaust pipes

70 and 72. Is also good. In this case, a pipe-side locking portion (the groove 77 in FIG. 7) may be provided on the outer

peripheral surface portions

75 and 78 of the V band flange 71 of one of the first exhaust pipe 70 and the second exhaust pipe 72.

In the first embodiment and the second embodiment, the gasket 4 is made of metal. However, the gasket 4 may be made of resin.

In the first embodiment and the second embodiment, the temporary holding structure of the gasket is applied to the exhaust pipe (flow pipe) 1. However, the present invention is not limited to this. The present invention may be applied to a flow pipe (flow pipe) such as a pipe or a fuel supply pipe.

This application is based on a Japanese patent application filed on Sep. 27, 2018 (Japanese Patent Application No. 2018-181893), 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 first exhaust pipe (first flow pipe)
3 2nd exhaust pipe (2nd distribution pipe)
Reference Signs List 4 Gasket 5 V band 6 Tightening bolt 11 First exhaust pipe main body 12 V band flange 13 One inclined outer peripheral surface 14 Other inclined outer peripheral surface 15 Intermediate outer peripheral surface (non-contact area)
16 groove (tube side locking part)
DESCRIPTION OF SYMBOLS 20 Protrusion tip part 21 2nd exhaust pipe main body 22 V band flange 23 Same diameter part 24 Large diameter part 31 Gasket main body 32 Claw part (gasket side locking part)
33 Extension part 34 Projection part 41 Frame member 42 V-shaped member 43 Tightening part 44 Bottom plate part 45 Side plate part 48 Space 53 Projection part (tube side locking part)

Claims

When fastening 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 by connecting them with a V-band, A gasket interposed between a first V-band flange and the second V-band flange of the second flow pipe is temporarily held with respect to the first V-band flange of the first flow pipe. A temporary holding structure for the gasket,
The outer peripheral surface of the first V-band flange of the first flow pipe is separated radially inward from the inner peripheral surface of the V-band at the time of tightening of the V-band and between the inner peripheral surface of the V-band. Has a non-contact area that partitions the space,
The first V-band flange of the first flow pipe has a concave or convex pipe-side locking portion formed in the non-contact area of the outer peripheral surface,
The gasket has an annular gasket main body and a gasket-side locking portion provided in at least a part of an outer peripheral edge of the gasket main body,
The gasket-side engaging portion of the gasket is configured such that the gasket main body is disposed along a surface of the first V-band flange on the tip side of the first V-band flange. 1. A temporary holding structure for a gasket to be locked to the tube-side locking portion of the V band flange.
It is a temporary holding structure of the gasket according to claim 1,
The pipe-side locking portion of the first V-band flange of the first flow pipe is radially inward from the non-contact area on the outer peripheral surface of the first V-band flange of the first flow pipe. A concave tube-side locking portion that is recessed into
The gasket-side locking portion is disposed at a position corresponding to the concave tube-side locking portion, and is locked by entering the concave tube-side locking portion from the radial outside to the radial inside. Temporary gasket holding structure with protrusions.
It is a temporary holding structure of the gasket according to claim 1 or 2,
The gasket-side locking portion of the gasket is provided in a partial region of an outer peripheral edge of the gasket main body.
It is a temporary holding structure of the gasket according to claim 3,
The gasket has a plurality of gasket-side locking portions.