JP2018165483A - Catalyst converter support structure of exhaust pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a catalyst converter support structure of an exhaust pipe which is effective for vehicle body vibration while securing the easiness of the assembling and removal of a catalyst converter, simple in a structure and reducible in a size.SOLUTION: An intermediate part of an exhaust pipe 54 for connecting a cylinder head and a muffler is divided, and an outer cylinder 92 constituting a catalyst converter 57 for purifying exhaust emission by a catalyst is arranged so as to straddle end faces 81c, 82c of the exhaust pipe 54. Then, a front diameter-expanded part 81b for fixing one end part of the outer cylinder 92 is arranged at either (front exhaust pipe 81) of the front exhaust pipe 81 and a rear exhaust part 82 in front and ahead of the end faces 81c, 82c. The other end part of the outer cylinder 92 is held to the other (rear exhaust pipe 82) of the front exhaust pipe 81 and the rear exhaust pipe 82, and the outer cylinder 92 is detachably attached so as to straddle one front exhaust pipe 81 and the other rear exhaust pipe 82 of the exhaust pipe 54.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a catalytic converter support structure for an exhaust pipe.

  2. Description of the Related Art Conventionally, a structure that ensures the ease of removing a catalytic converter in an exhaust pipe is known (see, for example, Patent Document 1).

JP 2005-233053 A

In Patent Document 1, since the cylindrical catalytic converter is cantilevered and the metal metal honeycomb catalyst is heavy, there is a problem in the support structure against vehicle body vibration. In addition, the portion where the catalytic converter is held has a triple structure including the catalytic converter, and the structure is complicated, and it is not easy to assemble and remove.
SUMMARY OF THE INVENTION An object of the present invention is to provide an effective support structure for vehicle body vibration while ensuring ease of assembly and removal of the catalytic converter, and an exhaust pipe catalytic converter support structure that is simple in structure and can be reduced in size. It is to provide.

  The present invention constitutes a catalytic converter (57, 106, 116) for dividing the exhaust pipe (54, 100, 110) connecting the cylinder head (47) and the muffler (56) and purifying the exhaust gas with a catalyst. The outer cylinder (92, 108, 118) is arranged so as to straddle the divided portions (81c, 82c, 101c, 102c, 111c, 112c) of the exhaust pipe (54, 100, 110), and the divided portions (81c, 82c, 101c, 102c, 111c, 112c) One end of the outer cylinder (92, 108, 118) on one (81, 101, 111) of the divided exhaust pipes (81, 82, 101, 102, 111, 112) before and after A fixing portion (81b, 101b, 111b) for fixing the portion is provided, and the other (82, 1) of the divided exhaust pipe (81, 82, 101, 102, 111, 112) is provided. 2, 112) holds the other end of the outer cylinder (92, 108, 118), and the outer cylinder (92, 108, 118) is connected to one of the exhaust pipes (54, 100, 110) (81, 101, 111) and the other (82, 102, 112).

  The present invention divides the middle of the exhaust pipe (54, 100, 120, 130) connecting the cylinder head (47) and the muffler (56) and divides the divided exhaust pipe (81, 82, 101, 102). , 121, 122, 131, 132), one end (81, 101, 121, 131) and the other end (82, 102, 122, 132) are arranged apart from each other, and the divided exhaust pipe (81 , 82, 101, 102, 121, 122, 131, 132), exhaust is purified by a catalyst at one end (81, 101, 121, 131) and the other (82, 102, 122, 132) of the other (82, 102, 122, 132). It arrange | positions so that the outer cylinder (92,108,128,138) which comprises a catalytic converter (57,106,126,136) may be straddled, and the said outer cylinder (92,108,128, 38) at one end (81, 101, 121, 131) and the other end (82, 102, 122, 132) of the divided exhaust pipe (81, 82, 101, 102, 121, 122, 131, 132). It is characterized by being detachably supported by the part.

  In the above invention, the exhaust pipe (54) is connected to the cylinder head (47) of the engine (36) supported by the vehicle body frame (11) of the saddle-ride type vehicle (10), and the vehicle body frame (11). Includes a down frame (27) extending downward from a head pipe (21) constituting the front end portion thereof, and the exhaust pipe (54, 100, 110, 120, 130) is connected to the down frame (27). The outer cylinder (92, 108, 118, 128, 138) is divided into upper and lower portions arranged around the upper end of the divided exhaust pipe (81, 82, 101, 102, 111, 112, 121, 122, 131, 132) may be connected to the lower end of one (81, 101, 111, 121, 131).

In the above invention, the outer cylinder (92, 128) may be fixed to the divided exhaust pipe (81, 82, 121, 122) by a fixing member (86).
In the above invention, the outer cylinder (108) of the catalytic converter (106) is formed with one of a male screw (108e) or a female screw, and either the male screw (108e) or the female screw and the split The male screw or the female screw (101e) formed on one (101) of the exhaust pipe (101, 102) may be screw-coupled.

  Moreover, in the said invention, the threaded part (111e, 111g) is respectively provided in the inner peripheral part (111d) and outer peripheral part (111f) of the one end part in one (111) of the said division | segmentation exhaust pipes (111,112), One end of the outer cylinder (118) of the converter (116) and one end of the other (112) of the divided exhaust pipe (111, 112) are screw-coupled to the screw (111e, 111g). May be.

  Moreover, in the said invention, a thread part (108e, 108p) is respectively provided in the outer peripheral part (108d) of the one end part of the said outer cylinder (108) of the said catalytic converter (106), and the inner peripheral part (108m) of the other end part. In addition, the respective end portions of the divided exhaust pipes (101, 102) may be screw-coupled to the screw portions (108e, 108p).

  In the above invention, the outer cylinder (108) includes an inner cylinder part (108f) and an outer cylinder part (108g) extending integrally from one end of the outer cylinder (108), and the outer cylinder (108f) is provided outside the radius outside the inner cylinder part (108f). A cylindrical portion (108g) may be disposed, and the screw portions (108e, 108p) may be formed at one end of the outer cylinder (108) and an end of the outer cylindrical portion (108g). .

  The present invention divides the middle of the exhaust pipe connecting the cylinder head and the muffler, and arranges the outer cylinder constituting the catalytic converter for purifying the exhaust gas with the catalyst so as to straddle the divided part of the exhaust pipe, and before and after the divided part. A fixed portion for fixing one end of the outer cylinder is provided on one side of the divided exhaust pipe, and the other end of the outer cylinder is held on the other side of the divided exhaust pipe so that the outer cylinder straddles one side and the other of the exhaust pipe. Because it is detachable, the catalytic converter can be protected against vehicle vibration while supporting both ends of the outer cylinder and arranging the outer cylinder so as to straddle both the split exhaust pipes while ensuring ease of assembly and removal. It can be effectively supported, and the support structure is simple and downsizing can be achieved.

  The present invention divides the middle of the exhaust pipe connecting the cylinder head and the muffler, arranges one and the other ends of the divided exhaust pipes separated from each other, and arranges one of the divided exhaust pipes and At the other end, it is arranged so as to straddle the outer cylinder that constitutes the catalytic converter that purifies the exhaust gas with the catalyst, and the outer cylinder is detachably supported at the one end and the other end of the divided exhaust pipe. Therefore, the structure that connects the divided exhaust pipes using an outer cylinder can support the catalytic converter effectively against vehicle vibration while ensuring ease of assembly, and the support structure is simple. In addition, the size can be reduced.

  In the above invention, the exhaust pipe is connected to the cylinder head of the engine supported by the body frame of the saddle-ride type vehicle, and the body frame includes a down frame extending downward from a head pipe constituting the front end portion thereof. The exhaust pipe is divided at a part extending in the vertical direction around the down frame, and the upper end of the outer cylinder is connected to one lower end of the divided exhaust pipe. Even with the exhaust pipe attached to the cylinder head, the opening of one of the divided exhaust pipes faces downward, so that foreign matter can be prevented from entering the engine through one of the divided exhaust pipes. Since it can be easily assembled to the exhaust pipe while lifting the outer cylinder from below, the maintainability can be improved.

Moreover, in the said invention, since an outer cylinder is fixed to a division | segmentation exhaust pipe with a fixing member, maintainability can be improved.
In the above invention, the outer cylinder of the catalytic converter is formed with one of a male screw and a female screw, and the other of the male screw and the female screw formed on one of the divided exhaust pipes. Since these are screwed together, the maintainability can be improved.

  In the above invention, the inner peripheral portion and the outer peripheral portion of one end portion of one of the divided exhaust pipes are each provided with a screw portion, and one end portion of the outer cylinder of the catalytic converter and the other one end portion of the divided exhaust pipe are screw portions. Therefore, the exhaust pipe dividing structure and the catalytic converter support structure can be simplified, and the cost can be reduced.

  In the above invention, the outer peripheral portion of one end of the outer cylinder of the catalytic converter and the inner peripheral portion of the other end thereof are each provided with a screw portion, and each end portion of the divided exhaust pipe is screwed to the screw portion. The one end side and the other end side of the outer cylinder can have different diameters, and the rigidity of the outer cylinder can be improved.

  In the above invention, the outer tube includes an inner tube portion and an outer tube portion that integrally extend from one end portion thereof, the outer tube portion is disposed on the radially outer side of the inner tube portion, and the screw portion is one end portion of the outer tube. And the end of the outer cylinder, the end of the inner cylinder can be held by the other of the split exhaust pipes, and both ends of the catalytic converter are supported while improving the rigidity of the outer cylinder. can do.

1 is a right side view of a motorcycle including an exhaust pipe catalytic converter support structure according to a first embodiment of the present invention. It is a longitudinal cross-sectional view which shows the catalytic converter support structure of the exhaust pipe of 1st Embodiment. It is the III-III sectional view taken on the line of FIG. It is a longitudinal cross-sectional view which shows the catalytic converter support structure of the exhaust pipe of 2nd Embodiment. It is a longitudinal cross-sectional view which shows the catalytic converter support structure of the exhaust pipe of 3rd Embodiment. It is a longitudinal cross-sectional view which shows the catalytic converter support structure of the exhaust pipe of 4th Embodiment. It is a longitudinal cross-sectional view which shows the catalytic converter support structure of the exhaust pipe of 5th Embodiment.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a right side view of a motorcycle 10 having a catalyst converter support structure for an exhaust pipe according to a first embodiment of the present invention.
The motorcycle 10 includes a front wheel 13 supported on a front end portion of a body frame 11 via a front fork 12, a rear wheel 16 supported on a lower portion of the body frame 11 via a swing arm 14, and an upper portion of the body frame 11. And a sheet 17 attached to the.
The motorcycle 10 is a saddle type vehicle on which an occupant rides over a seat 17.

The body frame 11 includes a head pipe 21, a main frame 22, a pair of left and right center frames 23, a pair of left and right seat frames 24, a pair of left and right subframes 26, and a down frame 27.
The head pipe 21 constitutes the front end portion of the vehicle body frame 11. The main frame 22 extends rearward and obliquely downward from the head pipe 21. The left and right center frames 23 extend downward from the rear end of the main frame 22. The left and right seat frames 24 support the seat 17 by extending rearward from the left and right of the rear end of the main frame 22. The left and right sub-frames 26 are passed to the left and right center frames 23 and the left and right seat frames 24. The front end of the down frame 27 is connected to the head pipe 21 below the front end of the main frame 22, and extends downward and obliquely downward from the head pipe 21 below the main frame 22.

The front fork 12 has a bar handle 31 attached to the upper part and a front wheel 13 supported on the lower part via an axle 32. The swing arm 14 is supported by a pivot shaft 34 that is passed to the lower part of the left and right center frames 23 so as to be swingable up and down. The pivot shaft 34 extends in the vehicle width direction. A rear wheel 16 is supported on the rear end portion of the swing arm 14 via an axle 35.
An engine 36 is supported by lower portions of the left and right center frames 23 and a lower end portion of the down frame 27. The engine 36 is located below the main frame 22.
The engine 36 includes a crankcase 41 and a cylinder portion 42 raised from the upper front portion of the crankcase 41.

The crankcase 41 is attached to the left and right center frames 23 and the down frame 27. A transmission 44 is provided at the rear of the crankcase 41. The cylinder portion 42 includes a cylinder block 46 that protrudes upward from the crankcase 41, a cylinder head 47 that is attached to the top of the cylinder block 46, and a head cover 48 that covers the top of the cylinder head 47.
The cylinder head 47 has an intake device 51 connected to the rear surface and an exhaust device 52 connected to the front surface.
The exhaust device 52 is connected to an exhaust pipe 54 that extends forward from the cylinder head 47 and bends and extends backward, a catalyst housing portion 55 provided in the middle of the exhaust pipe 54, and a rear end portion of the exhaust pipe 54. A muffler 56 and a catalytic converter 57 disposed in the catalyst housing 55 are provided. A heat shield cover 58 is attached to the muffler 56. The catalytic converter 57 purifies the exhaust gas flowing in the exhaust pipe 54 by the catalyst.

A fuel tank 61 disposed in front of the seat 17 is attached to the main frame 22 and the seat frame 24.
A part of the body frame 11 is covered with a body cover 62. The vehicle body cover 62 includes a front cowl 63, a pair of left and right side covers 64, and a pair of left and right rear side covers 65.
The front cowl 63 covers the front and both sides of the front fork 12, both sides of the main frame 22 and the down frame 27, and both sides of the fuel tank 61.

The left and right side covers 64 cover both sides of the main frame 22, the center frame 23, and the seat frame 24. The rear side cover 65 covers both sides of the seat frame 24 and the sub frame 26.
A pair of left and right lower step brackets 66 are attached to the lower portion of the center frame 23, and a driver step 67 is provided on the left and right lower step brackets 66. In addition, rear step brackets 68 are attached to the left and right subframes 26, and passenger steps 69 are provided in the respective rear step brackets 68.
A pair of left and right rear cushion units 71 are passed between the swing arm 14 and the left and right subframes 26.
The front wheel 13 is covered with a front fender 75 from above. The rear wheel 16 is covered with a rear fender 77 from above.

FIG. 2 is a longitudinal sectional view showing the catalytic converter support structure of the exhaust pipe 54 of the first embodiment. As shown in FIG. 1, the portion of the exhaust pipe 54 where the catalytic converter 57 is provided (catalyst accommodating portion 55) rises forward around the down frame 27 (specifically, on the right side of the down frame 27). Although extending, in FIG. 2, the longitudinal section of the portion of the exhaust pipe 54 where the catalytic converter 57 is provided is drawn horizontally (the same applies to the other drawings).
In the drawing, the direction in which the exhaust gas in the exhaust pipe 54 flows (the direction from upstream to downstream) is indicated by a white arrow A (the same applies to other drawings).
The exhaust pipe 54 includes a front exhaust pipe 81 and a rear exhaust pipe 82 which are divided into two.
The front exhaust pipe 81 includes a front pipe portion 81a extending from the cylinder head 47 (see FIG. 1) side and a front enlarged diameter portion 81b formed integrally with a rear end portion of the front pipe portion 81a. The front enlarged portion 81b is a portion whose diameter is larger than that of the front pipe portion 81a.
The rear exhaust pipe 82 includes a rear pipe part 82a extending from the muffler 56 (see FIG. 1) side, and a rear enlarged diameter part 82b formed integrally with the front end part of the rear pipe part 82a. The rear diameter-expanded portion 82b is a portion whose diameter is larger than that of the rear tube portion 82a.

The front enlarged portion 81 b and the rear enlarged portion 82 b constitute a catalyst housing portion 55, and a catalytic converter 57 is disposed in the catalyst housing portion 55.
The catalytic converter 57 is fixed to the catalyst housing 55 by a catalyst fixture 84.
The catalyst fixture 84 includes a pair of annular gaskets 85, 85, a pair of band members 86, 86, and a pair of fastening members 87.
The pair of gaskets 85, 85 seals between the front enlarged portion 81 b and the rear enlarged portion 82 b and the catalytic converter 57. The pair of band members 86, 86 fasten the front enlarged portion 81b and the rear enlarged portion 82b from the outside. The fastening member 87 generates a fastening force on the band member 86.
The catalytic converter 57 includes a cylindrical support 91 on which a catalyst is supported and an outer cylinder 92 in which the support 91 is inserted, and purifies exhaust gas passing through the support 91 by contacting the catalyst.

The catalytic converter 57 is disposed so as to straddle the front enlarged diameter portion 81 b of the front exhaust pipe 81 and the rear enlarged diameter portion 82 b of the rear exhaust pipe 82.
The front enlarged portion 81b has a front tapered portion 81d that gradually increases in diameter from the front pipe portion 81a side toward the end surface 81c side of the front exhaust pipe 81, and a cylindrical shape that extends from the rear end of the front tapered portion 81d. Front large-diameter portion 81e.
The rear enlarged portion 82b includes a rear tapered portion 82d that gradually increases in diameter from the rear pipe portion 82a toward the end face 82c of the rear exhaust pipe 82, and a cylindrical rear large diameter portion 82e that extends from the front end of the rear tapered portion 82d. And a rear small diameter portion 82f, which will be described in detail later.

The outer cylinder 92 includes a front end small-diameter portion 92b, a large-diameter portion 92c, and a rear small-diameter portion 92d in order from the upstream side of the exhaust gas on the outer peripheral surface 92a. The front end small diameter portion 92b and the rear small diameter portion 92d have the same outer diameter, and the outer diameters of the front end small diameter portion 92b and the rear small diameter portion 92d are smaller than the outer diameter of the large diameter portion 92c.
The front end small-diameter portion 92b of the outer cylinder 92 is inserted into the front large-diameter portion 81e of the front exhaust pipe 81 with a gasket 85 fitted on the outer peripheral surface, and is formed by a band member 86 from the outside of the front large-diameter portion 81e. Tightened and fixed.
The large diameter portion 92 c of the outer cylinder 92 is a portion straddling the end surface 81 c of the front exhaust pipe 81 and the end surface 82 c of the rear exhaust pipe 82.

The rear small diameter portion 92d of the outer cylinder 92 has a gasket 85 fitted on the outer peripheral surface thereof, is inserted into the rear large diameter portion 82e of the rear exhaust pipe 82, and is fastened and fixed by a band member 86 from the outside of the rear large diameter portion 82e. The
The rear small diameter portion 92d of the outer cylinder 92 is fitted into the rear small diameter portion 82f of the rear exhaust pipe 82 in a clearance fit state. The rear small diameter portion 82f is a portion that is provided in front of the rear tube portion 82a and has a diameter larger than that of the rear tube portion 82a.
In a state where the catalytic converter 57 is fixed to the front exhaust pipe 81 and the rear exhaust pipe 82, a gap 93 having a distance L1 is provided between the end face 81c of the front exhaust pipe 81 and the end face 82c of the rear exhaust pipe 82. It is done. By providing such a gap 93, the front exhaust pipe 81 fixed to the cylinder head 47 (see FIG. 1) of the engine 36 (see FIG. 1) and the muffler fixed to the vehicle body frame 11 (see FIG. 1). The thermal expansion during engine operation with 56 is absorbed.

3 is a cross-sectional view taken along line III-III in FIG.
The band member 86 includes an annular portion 86a that can be deformed along the outer peripheral surface of the front large diameter portion 81e of the front exhaust pipe 81 (or the rear large diameter portion 82e of the rear exhaust pipe 82 shown in FIG. 2). And a pair of bent portions 86b and 86b bent from both ends of the annular portion 86a.
The bent portion 86b has a bolt insertion hole 86c through which the bolt 94 is passed.
The fastening member 87 includes a pair of washers 95, 95 arranged along the bent portions 86b, 86b of the band member 86, a bolt 94 passed through the bolt insertion holes 86c, 86c and the washers 95, 95, and a bolt 94. And a nut 96 that is screwed to the tip of the nut.
When the annular portion 86a of the band member 86 is simply wound around the front large-diameter portion 81e or the rear large-diameter portion 82e, a gap is formed between the pair of bent portions 86b and 86b. In this state, by tightening the bolt 94, the gap between the bent portions 86b and 86b is reduced, and the tightening force is applied to the front large-diameter portion 81e of the front exhaust pipe 81 or the rear large-diameter portion 82e of the rear exhaust pipe 82. And the catalytic converter 57 is fixed to the front exhaust pipe 81 or the rear exhaust pipe 82.

1 and 2, as one method of assembling the catalytic converter 57 to the exhaust pipe 54, the front exhaust pipe 81 is previously attached to the cylinder head 47 of the engine 36, and the rear exhaust pipe 82 to which the muffler 56 is connected. The catalytic converter 57 is fixed to the front.
In order to fix the catalytic converter 57 to the rear exhaust pipe 82, the catalytic converter 57 is connected to the rear exhaust pipe 82 from the downstream end 92 e side of the outer cylinder 92 with the gasket 85 fitted to the rear small diameter portion 92 d of the catalytic converter 57. It inserts in the rear part enlarged diameter part 82b. Specifically, the rear small diameter portion 92 d of the outer cylinder 92 is inserted into the rear small diameter portion 82 f of the rear exhaust pipe 82, and the downstream end 85 a of the gasket 85 is inserted until it contacts the rear tapered portion 82 d of the rear exhaust pipe 82. At this time, the upstream end 85 b of the gasket 85 hits the downstream end 92 f of the large diameter portion 92 c of the outer cylinder 92, and the catalytic converter 57 is positioned with respect to the rear exhaust pipe 82. In this state, the band member 86 fitted to the rear large diameter portion 82e of the rear exhaust pipe 82 is tightened by the fastening member 87. This completes the fixing of the catalytic converter 57 to the rear exhaust pipe 82. The rear small diameter portion 92d of the outer cylinder 92 is held by the rear small diameter portion 82f of the rear exhaust pipe 82 so as to be slidable (thermally expandable) in the longitudinal direction of the rear small diameter portion 92d. As a result, the catalytic converter 57 is supported at three locations including the front large diameter portion 81e of the front exhaust pipe 81, the rear large diameter portion 82e of the rear exhaust pipe 82, and the rear small diameter portion 82f. That is, the catalytic converter 57 is supported at both the front end portion and the rear end portion.

Next, the front end small diameter portion 92 b side of the catalytic converter 57 fixed to the rear exhaust pipe 82 is assembled to the front exhaust pipe 81.
Specifically, the catalytic converter 57 is inserted into the front large diameter portion 81e of the front exhaust pipe 81 from the upstream end 92g side of the outer cylinder 92 with the gasket 85 fitted to the front end small diameter portion 92b of the catalytic converter 57.
At this time, the upstream end 85b of the gasket 85 is applied to the front taper portion 81d, and the downstream end 85a of the gasket 85 is applied to the large diameter portion 92c of the outer cylinder 92. Thus, the catalytic converter 57 is positioned with respect to the front exhaust pipe 81.
In this state, the front-rear direction positions of the muffler 56, the rear exhaust pipe 82 and the catalytic converter 57 are adjusted, and the muffler 56 (see FIG. 1) is fixed to the vehicle body frame 11 (see FIG. 1). Then, the band member 86 fitted to the front large-diameter portion 81 e of the front exhaust pipe 81 is tightened by the fastening member 87. This completes the fixing of the catalytic converter 57 to the front exhaust pipe 81.
The method for assembling the catalytic converter 57 to the exhaust pipe 54 is not limited to the above.

As shown in FIGS. 1 and 2 above, the outer cylinder 92 constituting the catalytic converter 57 that divides the middle of the exhaust pipe 54 that connects the cylinder head 47 and the muffler 56 and purifies the exhaust with a catalyst is provided in the exhaust pipe 54. It arrange | positions so that it may straddle the end surfaces 81c and 82c as a division part. Further, the front diameter expansion as a fixing portion for fixing one end portion of the outer cylinder 92 to one of the front exhaust pipe 81 and the rear exhaust pipe 82 (front exhaust pipe 81) as the divided exhaust pipes around the end faces 81c and 82c. A portion 81b is provided. Further, the other end of the outer cylinder 92 is held by the other of the front exhaust pipe 81 and the rear exhaust pipe 82 (rear exhaust pipe 82), and the outer cylinder 92 is connected to one front exhaust pipe 81 of the exhaust pipe 54 and the other. The rear exhaust pipe 82 was detachably attached.
According to this configuration, while supporting the both ends of the outer cylinder 92 and arranging the outer cylinder 92 so as to straddle both the front exhaust pipe 81 and the rear exhaust pipe 82, while ensuring ease of assembly and removal, The catalytic converter 57 can be effectively supported against the vehicle body vibration, and the support structure is simple and can be reduced in size.

Further, the middle of the exhaust pipe 54 connecting the cylinder head 47 and the muffler 56 is divided, and one of the front exhaust pipe 81 and the rear exhaust pipe 82 (front exhaust pipe 81) and the other (rear exhaust pipe) formed by the division. 82) are spaced apart from each other. At the same time, an outer portion constituting a catalytic converter 57 for purifying exhaust gas with a catalyst is provided at one end of one of the front exhaust pipe 81 and the rear exhaust pipe 82 (front exhaust pipe 81) and the other (rear exhaust pipe 82). It arrange | positioned so that the pipe | tube 92 might be straddled. Then, the outer cylinder 92 was detachably supported at each end of one of the front exhaust pipe 81 and the rear exhaust pipe 82 (front exhaust pipe 81) and the other (rear exhaust pipe 82).
According to this configuration, the structure in which the front exhaust pipe 81 and the rear exhaust pipe 82 are connected using the outer cylinder 92 makes it possible to make the catalytic converter 57 effective against vehicle body vibration while ensuring ease of assembly. It can be supported, and the support structure is simple and downsizing can be achieved.

The exhaust pipe 54 is connected to a cylinder head 47 of the engine 36 supported by the body frame 11 of the motorcycle 10 as a saddle-ride type vehicle, and the body frame 11 is lowered from the head pipe 21 constituting the front end portion thereof. A down frame 27 extending to the side is provided. The exhaust pipe 54 is divided by a vertically extending portion disposed around the down frame 27, and the upper end portion of the outer cylinder 92 is one of the front exhaust pipe 81 and the rear exhaust pipe 82 (front exhaust pipe 81). It is connected with the lower end part.
According to this configuration, since the opening of one front exhaust pipe 81 faces downward even when one front exhaust pipe 81 is attached to the cylinder head 47 when the catalytic converter 57 is replaced, one front exhaust pipe It is possible to prevent foreign matter from entering the engine 36 through 81. Further, since the outer cylinder 92 can be easily assembled to the one front exhaust pipe 81 while being lifted from below, the maintainability can be improved.

  Further, as shown in FIGS. 2 and 3, the outer cylinder 92 is fixed to the front exhaust pipe 81 and the rear exhaust pipe 82 with a band member 86 as a fixing member. Maintenance performance such as inspection and replacement of 57 can be improved.

Second Embodiment
FIG. 4 is a longitudinal sectional view showing the catalytic converter support structure of the exhaust pipe 100 of the second embodiment. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The exhaust pipe 100 includes a front exhaust pipe 101 and a rear exhaust pipe 102 which are divided into two parts.
The front exhaust pipe 101 includes a front pipe part 101a extending from the cylinder head 47 (see FIG. 1) side and a front enlarged diameter part 101b formed integrally with a rear end part of the front pipe part 101a. The front enlarged-diameter portion 101b is a portion whose diameter is larger than that of the front pipe portion 101a.
The rear exhaust pipe 102 includes a rear pipe portion 102a extending from the muffler 56 (see FIG. 1) side, and a rear enlarged diameter portion 102b formed integrally with the front end portion of the rear pipe portion 102a. The rear diameter-expanded portion 102b is a portion that is larger in diameter than the rear tube portion 102a.

The front enlarged diameter portion 101 b and the rear enlarged diameter portion 102 b constitute a catalyst support portion 104, and the catalytic converter 106 is supported by the catalyst support portion 104.
The front enlarged diameter portion 101b of the front exhaust pipe 101 has a female screw 101e formed on its inner peripheral surface 101d. Further, the rear enlarged diameter portion 102b of the rear exhaust pipe 102 has a screw 102g formed on the outer peripheral surface 102f thereof.
The catalytic converter 106 includes a cylindrical support 91 on which a catalyst is supported, and an outer cylinder 108 in which the support 91 is inserted.

The catalytic converter 106 is screwed to the front enlarged diameter portion 101 b of the front exhaust pipe 101 and the rear enlarged diameter portion 102 b of the rear exhaust pipe 102.
The outer cylinder 108 of the catalytic converter 106 includes a base part 108b provided on the upstream end 108a side and a double cylinder part 108c branched from the base part 108b and extending to the downstream side.
The base 108b has a screw 108e formed on the outer peripheral surface 108d thereof. The male screw 108e is screwed to the female screw 101e of the front exhaust pipe 101.
The double cylinder part 108c includes an inner cylinder part 108f fitted with the carrier 91 and an outer cylinder part 108g arranged so as to cover a part of the inner cylinder part 108f from the outside in the radial direction. An annular space 109 is provided between the inner cylinder part 108f and the outer cylinder part 108g.
The inner cylinder part 108f extends downstream from the outer cylinder part 108g.
The inner cylinder portion 108f has the same inner diameter as the inner diameter of the base portion 108b. The end portion on the downstream end 108 h side of the inner cylinder portion 108 f is fitted into the rear pipe portion 102 a of the rear exhaust pipe 102 in a clearance fit state. Thereby, the inner cylinder part 108f is held by the rear pipe part 102a so as to be slidable (thermally expandable) in the longitudinal direction of the inner cylinder part 108f.

The outer cylindrical portion 108g includes a flange portion 108j extending radially outward from the rear end of the base portion 108b, and a cylindrical portion 108k extending rearward from the outer peripheral edge of the flange portion 108j.
The flange portion 108j is a portion to which the end surface 101c of the front exhaust pipe 101 is applied. The cylindrical portion 108k is formed with a female screw 108p on its inner peripheral surface 108m so as to extend from the downstream end 108n to the flange portion 108j. The female screw 108p is screwed to the male screw 102g of the rear exhaust pipe 102. The upstream end 108q of the female screw 108p and the end face 102c of the rear exhaust pipe 102 are separated by a distance L2. Accordingly, when the rear exhaust pipe 102 and the muffler 56 (see FIG. 1) are assembled to the front exhaust pipe 101 and the catalytic converter 106 by the screw coupling portion of the female screw 108p and the male screw 102g, the entire length of the exhaust pipe 100 is reduced. Can be adjusted.
As described above, the catalytic converter 106 is supported at the three locations of the front enlarged diameter portion 101101b of the front exhaust pipe 101, the rear enlarged diameter portion 102b of the rear exhaust pipe 102, and the rear pipe portion 102a. That is, the catalytic converter 106 is supported at both ends by at least the front end portion and the rear end portion.
Further, by providing the outer tube 108 with the space 109, the heat generated in the carrier 91 of the catalytic converter 106 can be made difficult to be transmitted to the outside due to the heat insulating action of the space 109.

As described above, the outer cylinder 108 of the catalytic converter 106 has a screw 108e formed on the outer periphery thereof, and this male screw 108e and one of the front exhaust pipe 101 and the rear exhaust pipe 102 (the front exhaust pipe 101). ), And the screw 101e is screw-coupled. Therefore, maintenance performance such as inspection and replacement of the catalytic converter 106 can be improved.
Further, an outer peripheral surface 108d as an outer peripheral portion of one end portion of the outer cylinder 108 of the catalytic converter 106 and an inner peripheral surface 108m as an inner peripheral portion of the other end portion are respectively connected to a male screw 108e and a screw portion as a screw portion. A screw 108p is provided. The respective ends of the front exhaust pipe 101 and the rear exhaust pipe 102 are screwed to a male screw 108e and a female screw 108p, respectively.
According to this configuration, the one end side and the other end side of the outer cylinder 108 can have different diameters, and the rigidity of the outer cylinder 108 can be improved.
The outer cylinder 108 includes an inner cylinder part 108f and an outer cylinder part 108g that integrally extend from one end thereof, and the outer cylinder part 108g is disposed on the radially outer side of the inner cylinder part 108f. The external thread 108e and the internal thread 108p are , Respectively, at one end of the outer cylinder 108 and at the end of the outer cylinder 108g.
According to this configuration, the end of the inner cylinder portion 108f can be held by the other of the front exhaust pipe 101 and the rear exhaust pipe 102 (rear exhaust pipe 102), and the catalyst can be improved while improving the rigidity of the outer cylinder 108. Both ends of the converter 106 can be supported.

<Third Embodiment>
FIG. 5 is a longitudinal sectional view showing the catalytic converter support structure of the exhaust pipe 110 of the third embodiment. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The exhaust pipe 110 includes a front exhaust pipe 111 and a rear exhaust pipe 112 which are divided into two parts.
The front exhaust pipe 111 includes a front pipe portion 111a extending from the cylinder head 47 (see FIG. 1) side, and a front enlarged diameter portion 111b formed integrally with a rear end portion of the front pipe portion 111a. The front enlarged portion 111b is a portion whose diameter is larger than that of the front pipe portion 111a.
The rear exhaust pipe 112 includes a rear pipe part 112a extending from the muffler 56 (see FIG. 1) side, and a rear enlarged diameter part 112b formed integrally with the front end part of the rear pipe part 112a. The rear diameter-expanded portion 112b is a portion that is larger in diameter than the rear tube portion 112a.
The front enlarged diameter portion 111b and the rear exhaust pipe 112 including the rear enlarged diameter portion 112b constitute a catalyst accommodating portion 114, and a catalytic converter 116 is disposed in the catalyst accommodating portion 114.
The catalytic converter 116 includes a columnar carrier 91 on which a catalyst is supported, and an outer cylinder 118 into which the carrier 91 is inserted.

The catalytic converter 116 is disposed so as to straddle the front enlarged diameter portion 111b of the front exhaust pipe 111 and the rear enlarged diameter portion 112b of the rear exhaust pipe 112.
The front enlarged diameter portion 111b is formed with a female thread 111e on the inner peripheral surface 111d so as to extend from the end surface 111c to the front tube portion 111a side, and on the outer peripheral surface 111f so as to extend from the end surface 111c to the front tube portion 111a side. A male screw 111g is formed.
The rear enlarged diameter portion 112b is formed with a female screw 112e on its inner peripheral surface 112d so as to extend from the end surface 112c toward the rear tube portion 112a. The female thread 112e is screwed to the male thread 111g of the front exhaust pipe 111.

The outer cylinder 118 of the catalytic converter 116 is formed with a screw 118e on its outer peripheral surface 118a so as to extend from the upstream end 118c to the downstream end 118d side. The male screw 118e is screwed to the female screw 111e of the front exhaust pipe 111.
The end portion on the downstream end 118d side of the outer cylinder 118 is fitted into the rear pipe portion 112a of the rear exhaust pipe 112 in a clearance fit state. As a result, the end of the outer cylinder 118 on the downstream end 118d side is held slidable (thermally expandable) in the longitudinal direction of the outer cylinder 118 by the rear pipe portion 112a. As a result, the catalytic converter 116 is supported at both positions by the front enlarged portion 111b of the front exhaust pipe 111 and the rear pipe portion 112a of the rear exhaust pipe 112, which are the front end portion and the rear end portion.
An annular space 119 is provided between the rear exhaust pipe 112 and the catalytic converter 116. The heat insulation effect of the space 119 can make it difficult to transmit heat generated in the carrier 91 of the catalytic converter 116 to the outside.

As described above, the inner peripheral surface 111d as the inner peripheral portion of one end and the outer peripheral surface 111f as the outer peripheral portion of one of the front exhaust pipe 111 and the rear exhaust pipe 112 (front exhaust pipe 111) are screwed respectively. A female screw 111e as a portion and a male screw 111g as a screw portion are provided. One end portion of the outer cylinder 118 of the catalytic converter 116 and one end portion of the other of the front exhaust pipe 111 and the rear exhaust pipe 112 (rear exhaust pipe 112) are screw-coupled to a female screw 111e and a male screw 111g, respectively.
According to this configuration, the split structure of the exhaust pipe 110 and the support structure of the catalytic converter 116 can be simplified, and the cost can be reduced.

<Fourth embodiment>
FIG. 6 is a longitudinal sectional view showing the catalytic converter support structure of the exhaust pipe 120 of the fourth embodiment. In the fourth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The exhaust pipe 120 includes a front exhaust pipe 121 and a rear exhaust pipe 122 which are divided into two parts.
The front exhaust pipe 121 includes a front pipe part 121a extending from the cylinder head 47 (see FIG. 1) side, and a front enlarged diameter part 121b formed integrally with a rear end part of the front pipe part 121a. The front enlarged-diameter portion 121b is a portion whose diameter is larger than that of the front pipe portion 121a.
The rear exhaust pipe 122 includes a rear pipe part 122a extending from the muffler 56 (see FIG. 1) side, and a rear enlarged diameter part 122b formed integrally with the front end part of the rear pipe part 122a. The rear diameter-expanded portion 122b is a portion that is larger in diameter than the rear tube portion 122a.
The front enlarged portion 121b and the rear enlarged portion 122b constitute a catalyst support portion 124, and both ends of the catalytic converter 126 are supported by the catalyst support portion 124.

The catalytic converter 126 is fixed to the catalyst support portion 124 by a catalyst fixture 84.
The pair of gaskets 85, 85 seals between the front enlarged portion 121b and the rear enlarged portion 122b and the catalytic converter 126. The pair of band members 86, 86 fasten the front enlarged portion 121b and the rear enlarged portion 122b from the outside. The fastening member 87 generates a fastening force on the band member 86.
The catalytic converter 126 includes a columnar carrier 91 on which a catalyst is supported, an outer cylinder 128 into which the carrier 91 is inserted, and a cylindrical heat shield cover 129 fixed to the outer peripheral surface 128a of the outer cylinder 128. Become.

The catalytic converter 126 is disposed so as to straddle the front enlarged diameter portion 121b of the front exhaust pipe 121 and the rear enlarged diameter portion 122b of the rear exhaust pipe 122.
The front enlarged portion 121b includes a front tapered portion 121d that gradually increases in diameter from the front tube portion 121a side toward the end surface 121c of the front exhaust pipe 121, and a front large portion that extends from the rear end of the front tapered portion 121d. And a diameter portion 121e.
The rear enlarged portion 122b includes a rear tapered portion 122d that gradually increases in diameter from the rear pipe portion 122a toward the end surface 122c of the rear exhaust pipe 122, and a rear large diameter portion 122e that extends from the front end of the rear tapered portion 122d.
The front end side exposed portion 128c, which is the portion on the upstream end 128b side that is not covered with the heat shield cover 129 in the outer cylinder 128, is inserted into the front large diameter portion 121e of the front exhaust pipe 121 with the gasket 85 fitted. Then, the band member 86 is fastened and fixed from the outside of the front large-diameter portion 121e.

The rear end exposed portion 128e on the downstream end 128d side that is not covered with the heat shield cover 129 in the outer cylinder 92 is inserted into the rear large diameter portion 122e of the rear exhaust pipe 122 with the gasket 85 fitted. The band member 86 is fastened and fixed from the outside of the rear large-diameter portion 122e.
The heat shield cover 129 includes a pair of annular fixing portions 129a and 129a, a pair of tapered portions 129b and 129b, and an intermediate cylinder portion 129c.
The pair of annular fixing portions 129 a and 129 a are fixed to the outer peripheral surface 128 a of the outer cylinder 128. The pair of taper portions 129b and 129b gradually increase in diameter as they approach each other from the ends of the annular fixing portions 129a and 129a. The intermediate cylinder portion 129c connects the pair of taper portions 129b and 129b.

A gap 125 is provided between the outer cylinder 128 described above and the pair of taper portions 129b and 129b and the intermediate cylinder portion 129c. By providing the gap 125, heat generated by the carrier 91 of the catalytic converter 126 can be made difficult to be transmitted to the outside due to the heat insulating action.
Further, as described above, the heat shield cover 129 has a function of forming the front end side exposed portion 128c and the rear end side exposed portion 128e that can be positioned and positioned on the outer peripheral surface 128a of the outer cylinder 128. Have.
In a state where the catalytic converter 126 is fixed to the front exhaust pipe 121 and the rear exhaust pipe 122, the end face 121c of the front exhaust pipe 121 and the end face 122c of the rear exhaust pipe 122 are separated by a distance L3. Thus, by separating the front exhaust pipe 121 and the rear exhaust pipe 122, the front exhaust pipe 121 fixed to the cylinder head 47 (see FIG. 1) of the engine 36 (see FIG. 1), and the vehicle body frame 11. Thermal expansion during engine operation with the muffler 56 fixed to (see FIG. 1) is absorbed.

The method for assembling the catalytic converter 126 to the exhaust pipe 120 may be the same as the method for assembling the catalytic converter 57 of the first embodiment shown in FIG.
When the catalytic converter 126 is inserted into the rear enlarged portion 122b of the rear exhaust pipe 122 from the downstream end 128d side of the outer cylinder 128, the rear end exposed portion 128e of the outer cylinder 128 has a larger rear diameter of the rear exhaust pipe 122. The gasket 85 is inserted until the downstream end 85a of the gasket 85 hits the rear tapered portion 122d of the rear exhaust pipe 122. At this time, the upstream end 85 b of the gasket 85 hits the downstream end 129 d of the heat shield cover 129, and the catalytic converter 126 is positioned with respect to the rear exhaust pipe 122.
Further, when the gasket 85 is fitted into the front end exposed portion 128c of the catalytic converter 126 and the gasket 85 is inserted into the front large diameter portion 121e of the front exhaust pipe 121, the upstream end 85b of the gasket 85 is moved forward. It is made to hit the part taper part 121d. The downstream end 85 a of the gasket 85 hits the upstream end 129 e of the heat shield cover 129. Thus, the catalytic converter 126 is positioned with respect to the front exhaust pipe 121.

<Fifth Embodiment>
FIG. 7 is a longitudinal sectional view showing the catalytic converter support structure of the exhaust pipe 130 of the fifth embodiment. In the fifth embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The exhaust pipe 130 includes a front exhaust pipe 131 and a rear exhaust pipe 132 that are divided into two.
The front exhaust pipe 131 includes a front pipe part 131a extending from the cylinder head 47 (see FIG. 1) side, and a front enlarged diameter part 131b integrally formed at the rear end part of the front pipe part 131a. The front enlarged portion 131b is a portion that is larger in diameter than the front pipe portion 131a.
The rear exhaust pipe 132 includes a rear pipe part 132a extending from the muffler 56 (see FIG. 1) side, and a rear enlarged diameter part 132b integrally formed at the front end part of the rear pipe part 132a. The rear diameter-expanded portion 132b is a portion that is larger in diameter than the rear tube portion 132a.

The front enlarged portion 131b and the rear enlarged portion 132b constitute a catalyst support portion 134, and the catalytic converter 136 is supported by the catalyst support portion 134.
The catalytic converter 136 is fastened to the catalyst support 134 by a pair of nut members 135 and 135.
The front expanded portion 131b of the front exhaust pipe 131 has a screw 131d formed on the outer peripheral surface 131c thereof. Further, the rear enlarged diameter portion 132b of the rear exhaust pipe 132 has a screw 132d formed on the outer peripheral surface 132c thereof.
The catalytic converter 136 includes a columnar carrier 91 on which a catalyst is supported, and an outer cylinder 138 in which the carrier 91 is inserted.

The catalytic converter 136 is supported so as to straddle the front enlarged diameter portion 131b of the front exhaust pipe 131 and the rear enlarged diameter portion 132b of the rear exhaust pipe 132.
The outer cylinder 138 includes a cylinder part 138a and flange parts 138b and 138b integrally formed at both ends of the cylinder part 138a.
The flange portions 138b and 138b are arranged so as to face the end surface 131e of the front enlarged portion 131b and the end surface 132e of the rear enlarged portion 132b via an annular gasket 137, respectively. The flange portions 138b and 138b are fastened to the front enlarged portion 131b and the rear enlarged portion 132b by the nut member 135 via the gasket 137, respectively.
The nut member 135 includes a nut main body 135a and an inner flange 135b extending radially inward from one end of the nut main body 135a. The nut body 135a has a female thread 135d formed on its inner peripheral surface 135c. The female screw 135d is screwed to the male screw 131d of the front enlarged portion 131b and the male screw 132d of the rear enlarged portion 132b. The inner flange 135b is pressed against the flange portions 138b and 138b of the outer cylinder 138.

The above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied without departing from the gist of the present invention.
The present invention is not limited to the case where the present invention is applied to the motorcycle 10, but can also be applied to saddle riding type vehicles including those other than the motorcycle 10. The saddle-ride type vehicle is a vehicle that includes all vehicles that ride on the vehicle body, and includes three-wheeled vehicles and four-wheeled vehicles that are classified as ATVs (terrain traveling vehicles).

10 Motorcycles (saddle-ride type vehicles)
11 Body frame 21 Head pipe 27 Down frame 36 Engine 47 Cylinder head 54, 100, 110, 120, 130 Exhaust pipe 56 Muffler 57, 106, 116, 126, 136 Catalytic converter 81, 101, 111, 121, 131 Front exhaust Pipe (one of the divided exhaust pipes)
81b, 101b, 111b Front expanded part (fixed part)
81c, 82c, 101c, 102c, 111c, 112c End face (dividing part)
82, 102, 112, 122, 132 Rear exhaust pipe (the other of the divided exhaust pipes)
86 Band member (fixing member)
92, 108, 118, 128, 138 Outer cylinder 101e, 108p, 111e Female thread (screw part)
102g, 108e, 111g Male thread (thread part)
108d outer peripheral surface (one outer peripheral portion)
108f inner cylinder part 108g outer cylinder part 108m inner peripheral surface (the other inner peripheral part)
111d Inner peripheral surface (inner peripheral part)
111f outer peripheral surface (outer peripheral part)

Claims (8)

  An outer cylinder (92) constituting a catalytic converter (57, 106, 116) for dividing the exhaust pipe (54, 100, 110) connecting the cylinder head (47) and the muffler (56) and purifying the exhaust with a catalyst. , 108, 118) are arranged so as to straddle the divided portions (81c, 82c, 101c, 102c, 111c, 112c) of the exhaust pipe (54, 100, 110), and the divided portions (81c, 82c, 101c, 102c, 111c, 112c) One end of the outer cylinder (92, 108, 118) is fixed to one (81, 101, 111) of the divided exhaust pipes (81, 82, 101, 102, 111, 112) before and after. A fixing portion (81b, 101b, 111b) is provided, and the other (82, 102, 11) of the divided exhaust pipe (81, 82, 101, 102, 111, 112) is provided. ) Is held by the other end of the outer cylinder (92, 108, 118), and the outer cylinder (92, 108, 118) is connected to one (81, 101, 111) of the exhaust pipe (54, 100, 110). ) And the other (82, 102, 112) are detachably attached so as to support the catalytic converter converter of the exhaust pipe.   The middle of the exhaust pipe (54, 100, 120, 130) connecting the cylinder head (47) and the muffler (56) is divided, and divided exhaust pipes (81, 82, 101, 102, 121, 122) formed by the division. , 131, 132) one end (81, 101, 121, 131) and the other end (82, 102, 122, 132) are spaced apart from each other, and the divided exhaust pipes (81, 82, 101) are arranged. , 102, 121, 122, 131, 132) at one end (81, 101, 121, 131) and the other (82, 102, 122, 132), a catalytic converter (57 , 106, 126, 136) are arranged so as to straddle the outer cylinders (92, 108, 128, 138) constituting the outer cylinders (92, 108, 128, 138). The removable exhaust pipes (81, 82, 101, 102, 121, 122, 131, 132) are attached to and detached from the ends of one (81, 101, 121, 131) and the other (82, 102, 122, 132). An exhaust pipe catalytic converter support structure characterized by being freely supported.   The exhaust pipe (54) is connected to the cylinder head (47) of the engine (36) supported by the vehicle body frame (11) of the saddle riding type vehicle (10), and the vehicle body frame (11) is connected to the front end thereof. The exhaust pipe (54, 100, 110, 120, 130) is disposed around the down frame (27). The down frame (27) extends downward from the head pipe (21) constituting the part. The upper cylinder (92, 108, 118, 128, 138) is divided into portions extending in the vertical direction, and the upper ends of the outer cylinders (92, 108, 118, 128, 138) are separated from the divided exhaust pipes (81, 82, 101, 102, 111, 112, 121, 122, 131, 132) is connected to a lower end portion of one of (81, 101, 111, 121, 131).   The said outer cylinder (92,128) is fixed to the said division | segmentation exhaust pipe (81,82,121,122) with the fixing member (86), The Claim 1 characterized by the above-mentioned. Support structure for exhaust gas catalytic converter.   The outer cylinder (108) of the catalytic converter (106) is formed with either a male screw (108e) or a female screw, and either the male screw (108e) or the female screw and the split exhaust pipe (101, 102). 4. The exhaust pipe catalytic converter support according to claim 1, wherein the male screw or the female screw (101 e) formed on one side (101) is screwed together. 5. Construction.   The inner periphery (111d) and the outer periphery (111f) at one end of one (111) of the divided exhaust pipe (111, 112) are respectively provided with screw portions (111e, 111g), and the catalytic converter (116) The one end portion of the outer cylinder (118) and the other end portion (112) of the divided exhaust pipe (111, 112) are screw-coupled to the screw portion (111e, 111g). Or a catalytic converter support structure for an exhaust pipe according to 3.   The catalytic converter (106) includes a threaded portion (108e, 108p) on an outer peripheral portion (108d) at one end and an inner peripheral portion (108m) at the other end of the outer cylinder (108), and the divided exhaust pipe. The exhaust pipe catalytic converter support structure according to any one of claims 1 to 3, wherein each end of (101, 102) is screw-coupled to the threaded portion (108e, 108p).   The outer cylinder (108) includes an inner cylinder part (108f) and an outer cylinder part (108g) that extend integrally from one end of the outer cylinder (108g), and the outer cylinder part (108g) is disposed radially outside the inner cylinder part (108f). The screw portion (108e, 108p) is disposed and formed at one end portion of the outer cylinder (108) and an end portion of the outer cylinder portion (108g). Support structure for exhaust pipe catalytic converter.

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