JPWO2018180272A1 - Exhaust system for straddle-type vehicles - Google Patents

Abstract

The exhaust device of the straddle-type vehicle includes an exhaust pipe 21 and a muffler 30 connected to the exhaust pipe 21. The muffler 30 closes a muffler body 32 and a front opening 32a of the muffler body 32. A downstream portion 24 of the exhaust pipe 21 is disposed inside the muffler 30. The exhaust pipe 21 extends rearward from the front of the vehicle in the muffler 30 and then bends and extends toward the front of the vehicle.The downstream end 24c of the exhaust pipe 21 is provided on the outer shell 31 of the muffler 30. It is supported by the exhaust pipe support 33b. Such a configuration can cope with a case where it is necessary to shorten the length of the exhaust pipe, reduce the number of parts, and support the exhaust pipe in the exhaust muffler with a simpler structure.

Description

  The present invention relates to an exhaust device for a straddle-type vehicle in which an exhaust pipe is connected to a muffler, and a downstream end of the exhaust pipe extends into the muffler.

DESCRIPTION OF RELATED ART Conventionally, as an exhaust device of a straddle-type vehicle, as disclosed in Patent Literature 1, there is an exhaust device in which an exhaust pipe extended and bent in a muffler is held by a holding member provided in the muffler. .
However, it is necessary to extend and hold the exhaust pipe arranged in the muffler to the holding member, and it is difficult to cope with the case where it is necessary to shorten the length of the exhaust pipe due to design restrictions.
Further, in order to reduce the number of parts of the exhaust device, it is desired to eliminate the holding member that holds the exhaust pipe in the muffler.

JP-A-2006-160914

  The exhaust device for a saddle-ride type vehicle according to the present invention has been invented in order to overcome the above-mentioned drawbacks, and its object is to cope with the case where the exhaust pipe length needs to be shortened, thereby reducing the number of parts. It is another object of the present invention to provide an exhaust device for a straddle-type vehicle that can support an exhaust pipe in an exhaust muffler with a simpler structure.

  The present invention overcomes the above-mentioned drawbacks, and comprises an exhaust pipe for discharging exhaust gas from an internal combustion engine, and a muffler connected to a downstream side of the exhaust pipe, and a downstream portion of the exhaust pipe is disposed inside the muffler. In the exhaust device for a saddle-ride type vehicle, the exhaust pipe extends rearward from the front of the vehicle in the muffler, and then bends and extends toward the front of the vehicle, and a downstream end of the exhaust pipe is An exhaust system for a straddle-type vehicle, wherein the exhaust system is supported by an exhaust pipe support provided on an outer shell of the muffler.

  The present invention corresponds to a case where the length of the exhaust pipe needs to be shortened because the exhaust pipe arranged in the muffler changes its extending direction and is supported by the exhaust pipe support provided on the outer shell of the muffler. In addition, since the exhaust pipe is supported using existing parts, the number of parts can be reduced and a simpler structure can be achieved, reducing manufacturing costs and reducing the weight of the exhaust system as a whole. Can be planned.

  The muffler is divided into a first expansion chamber and a second expansion chamber by arranging a partition in the muffler, and the entirety of the exhaust pipe inside the muffler arranged in the muffler is divided into the first expansion chamber. Can be arranged.

  According to the above configuration, the entire muffler portion provided in the muffler of the exhaust pipe is configured to be disposed in the first expansion chamber, so that the entire muffler device can be reduced in size.

  The outer shell of the muffler includes a muffler body, and a front cover that closes a front opening of the muffler body, the exhaust pipe support is provided on the front cover, and the internal combustion engine is provided on the front cover. A stay for connecting the muffler may be provided, and the stay may cover the exhaust pipe supporting portion of the front cover.

  According to the configuration, even if the exhaust pipe is supported by the front cover of the outer shell of the muffler, the stay supporting the muffler, which is an existing component, covers the exhaust pipe and the exhaust pipe support of the front cover. In addition, the exhaust pipe supporting portion can be supported by the front cover without impairing the appearance without the exhaust pipe supporting portion being visually recognized from the outside.

  The exhaust pipe support portion of the front cover is a convex part from which a part of the muffler protrudes, and the downstream end of the exhaust pipe is one of the convex part and the downstream end of the exhaust pipe. Can be fitted and supported.

  According to the configuration, the downstream end of the exhaust pipe can be effectively supported by the front cover with a simple structure.

  A downstream opening at a downstream end of the exhaust pipe may be closed by a closing part, and a communication hole communicating with the inside of the muffler may be provided in the downstream part of the exhaust pipe.

  According to the configuration, by providing a communication hole communicating with the inside of the muffler at a downstream portion of the exhaust pipe, the exhaust pipe and the muffler are closed even if the downstream end disposed in the muffler is closed by being supported by the front cover. Can communicate. In addition, since a plurality of communication holes are provided at a downstream portion of the exhaust pipe, the exhaust can be diffused into the muffler.

  The exhaust device for a saddle-ride type vehicle according to the present invention can cope with a case where the length of the exhaust pipe needs to be shortened, and the number of parts can be reduced because the exhaust pipe is supported using existing parts. As a result, a simpler structure can be achieved, and the manufacturing cost can be reduced and the entire exhaust device can be reduced in weight.

FIG. 1 is a right side view of a motorcycle equipped with a saddle-ride type vehicle exhaust device according to a first embodiment of the present invention. FIG. 3 is a perspective view of the exhaust device mounted on the motorcycle as viewed from obliquely right above. FIG. 2 is a view in which the exhaust device mounted on the motorcycle is cut vertically. It is a cross-sectional view of an exhaust device. It is a longitudinal section of an exhaust device. FIG. 6 is a view taken in the direction of arrows VI-VI in FIG. 5. FIG. 7 is a sectional view taken along the line VII-VII in FIG. 5. FIG. 9 is a longitudinal sectional view around an exhaust support portion in an exhaust device for a saddle-ride type vehicle according to a second embodiment of the present invention. FIG. 11 is a longitudinal sectional view around an exhaust support portion in an exhaust device for a saddle-ride type vehicle according to a third embodiment of the present invention. FIG. 13 is a vertical cross-sectional view around an exhaust support portion in an exhaust device for a saddle-ride type vehicle according to a fourth embodiment of the present invention. FIG. 7 is a perspective view of a part of an exhaust device of another saddle-ride type vehicle cut away. FIG. 12 is a cross-sectional view of the exhaust device of FIG. 11.

  Hereinafter, a first embodiment of an exhaust device for a straddle-type vehicle according to the present invention will be described with reference to FIGS.

  FIG. 1 is a right side view of a motorcycle 1 as an example of a straddle-type vehicle equipped with a saddle-ride type vehicle exhaust device 20 according to the first embodiment of the present invention. The motorcycle 1 includes a frame 2 oriented in the front-rear direction of the vehicle. The frame 2 is fixed to a head pipe 3 provided at a front end, and a down frame member 2a extending obliquely downward and rearward from the head pipe 3; It has a pair of left and right lower frame members 2b extending horizontally rearward from the lower end of the frame member 2a, and a pair of left and right seat frame members 2c extending obliquely rearward and upward from the rear end of the lower frame member 2b. The head pipe 3 movably supports a front fork 4 that supports a front wheel 5.

  The power unit 10 of the motorcycle 1 is an integrated type of an internal combustion engine 11 and a power transmission device 12 and is a unit swing type power unit 10 that can swing with respect to the frame 2. The internal combustion engine 11 is a forced air-cooled single-cylinder internal combustion engine, and is located at the center in the left-right direction of the vehicle. The power transmission device 12 is composed of a V-belt type continuously variable transmission (not shown) and a transmission gear device, is connected to the left side of the internal combustion engine 11, and is disposed on the left rear side of the motorcycle 1. The rear wheel 6 of the motorcycle 1 is connected to the rearmost rotating shaft 7 of the power transmission device 12.

  An intake manifold (not shown) having a fuel injection valve (not shown), a throttle body, a connecting tube, and an air cleaner (not shown) are sequentially connected to a cylinder (not shown) of the internal combustion engine 11. The outside air sucked from the air cleaner is mixed with the fuel sprayed from the fuel injection valve to form a mixture, which is sent to the cylinder of the internal combustion engine 11 and burned.

  An exhaust device 20 is connected to the exhaust gas discharge side of the internal combustion engine 11. The exhaust device 20 is connected to an exhaust port (not shown) of the internal combustion engine 11 and bends from the lower front to the rear, extends, and then bends and extends toward the front of the vehicle to exhaust the exhaust of the internal combustion engine. An exhaust gas catalyst device 25 is provided in the exhaust pipe 21 and a muffler 30 connected downstream of the exhaust pipe 21.

  The exhaust pipe 21 includes an upstream exhaust pipe 22, an intermediate exhaust pipe 23, and a downstream exhaust pipe 24 connected to an exhaust port (not shown) of the internal combustion engine 11, as shown in FIG. A catalyst device 25 is provided between the upstream exhaust pipe 22 and the intermediate exhaust pipe 23. The upstream side exhaust pipe 22 is formed to be further curved rightward from the lower side of the internal combustion engine 11 to the left from below, and the downstream end is connected to the left side of the catalyst device 25. The catalyst device 25 is disposed so that the longitudinal direction is directed to the vehicle width direction, and the right end of the catalyst device is connected to the upstream end 23a of the intermediate exhaust pipe 23. The intermediate exhaust pipe 23 extends toward the rear of the vehicle. As shown in FIG. 2, the downstream end 23b of the intermediate exhaust pipe 23 is connected to the upstream end of the downstream exhaust pipe 24 supported by the muffler 30 and 24a. As shown in FIG. 3, the downstream side exhaust pipe 24 includes a curved portion 24b and is formed in a substantially U-shape. The downstream end 24c of the downstream exhaust pipe 24 is supported by an exhaust pipe support 33b provided on a front cover 33 described later. At the downstream end 24c of the downstream side exhaust pipe 24, a plurality of communication holes 24e communicating the exhaust pipe 21 and the inside of the muffler 30 described later are formed.

  The muffler 30 is attached to the rear of the power unit 10 via the muffler support stay 19 so as to be located on the right side of the motorcycle 1 and rise obliquely rearward. The exhaust gas discharged from the internal combustion engine 11 passes through the exhaust pipe 21 and the catalyst device 25, is sent to the muffler 30, and is discharged to the outside air.

  The exhaust device 20 is shown in cross section in FIG. This cross-sectional view shows a muffler body 31 which is an outer shell of the muffler 30 of the exhaust device 20 as a cross section, shows the inside in plan view, and shows a part of the front of the front cover 33 in plan view. I have. FIG. 5 is a longitudinal sectional view of the exhaust device 20. As in FIG. 4, a muffler body 31 serving as an outer shell is shown as a cross section, and the inside is shown without being cut.

  As shown in FIGS. 3 to 5, the muffler 30 of the exhaust device 20 includes a muffler body 31 serving as an outer shell thereof, and a partition wall 36 that partitions the inside of the muffler body 31 into a first expansion chamber 40 and a second expansion chamber 41. A communication pipe 37 for communicating the first expansion chamber 40 with the second expansion chamber 41 and a tail pipe 38 for discharging exhaust gas from the muffler 30 to the outside air are provided. Substantially all of the exhaust pipe 24 on the downstream side of the exhaust pipe 21 except for the upstream end 24a is disposed inside the muffler body 31.

  The muffler body 31 includes a vertically long cylindrical muffler body 32 having an elliptical cross-section, and a front cover 33 that closes a front opening 32a and a rear opening 32b of the muffler body 32. And the tail cover 35 is fixed by welding.

  As shown in FIGS. 5 and 6, an exhaust pipe insertion portion 33a through which the upstream end 24a of the downstream exhaust pipe 24 is inserted is formed in the lower portion of the front surface of the front cover 33. The exhaust pipe insertion portion 33a is formed so as to protrude toward the outside. The upstream end 24a of the downstream exhaust pipe 24 is inserted and fixed to the front cover 33 by welding.

  A cylindrical convex part 33b, a part of which protrudes inward, is formed on the upper part of the front surface of the front cover 33, and the convex part 33b is fitted with the downstream end 24c of the downstream exhaust pipe 24. The exhaust pipe support portion 33b is formed. The inner diameter of the exhaust pipe support 33b and the outer diameter of the downstream end 24c of the downstream exhaust pipe 24 are set to substantially the same size, and the downstream end 24c is fitted to the exhaust pipe support 33b. A cap 34 is fitted into the downstream opening 24d of the downstream exhaust pipe 24, and the cap 34 is fixed to the exhaust pipe support 33b of the front cover 33 together with the downstream end 24c by welding. The downstream opening 24d is closed, and the downstream end 24c of the downstream exhaust pipe 24 is supported by the front cover 33.

  In the present embodiment, the front cover 33 is formed with a convex portion 33b protruding inward, and the downstream end portion 24c of the downstream side exhaust pipe 24 is fitted to and supported by the convex portion 33b. The downstream end 24c of the downstream exhaust pipe 24 abuts against the inner wall of the front cover 33 without contacting the downstream end 24c of the downstream exhaust pipe 24 without forming the exhaust pipe support portion 33b as the projection 33b on the cover 33, and The downstream end 24c may be supported by the front cover 33 by welding the 24c to the inner wall of the front cover 33.

  The inside of the muffler body 31 is partitioned by a partition. As shown in FIGS. 5 and 7, the partition wall 36 includes a wall portion 36a formed substantially in the same shape as the cross-sectional shape of the muffler body 31, and a peripheral edge of the wall portion 36a is perpendicular to the wall portion 36a. A mounting edge 36b having a predetermined width is provided, and the mounting edge 36b is fixed to the inner wall of the muffler body 31, and the inside of the muffler body 31 is longitudinally rearwardly moved by the partition 36 to the first expansion chamber 40, It is divided into two expansion chambers 41. At the upper left side of the wall portion 36a, there is provided a communication tube insertion portion 36c which projects forward in a cylindrical shape. The first expansion chamber 40 and the second expansion chamber 41 inside the muffler body 31 are connected to each other by a communication pipe 37 that is inserted into the communication pipe insertion portion 36c of the partition 36 and welded to the partition.

  Below the tail cover 35, a tail pipe insertion portion 35a projecting rearward in a cylindrical shape is provided, and the tail pipe 38 is inserted into the tail pipe insertion portion 35a and welded. The second expansion chamber 41 is communicated with the outside air by a tail pipe 38, and the exhaust gas discharged from the internal combustion engine 11 is discharged to the rear of the vehicle.

  A downstream exhaust pipe 24 downstream of the exhaust pipe 21 is disposed inside the muffler 30, and a part of the upstream side of the downstream exhaust pipe 24 is connected to the exhaust pipe insertion portion 33 a of the front cover 33 through the muffler 30. The muffler outer portion 24f is located outside of the muffler, and the other portion is a muffler inner portion 24g disposed in the muffler 30. The entire muffler portion 24g is disposed in the first expansion chamber 40.

  As shown in FIG. 2, a pair of muffler support stays 19 are attached to the front cover 33 at the front of the muffler 30 by welding or the like, which are located substantially at the center of the upper left and right sides and near the lower left. . The upper muffler support stay 19a fixed to the upper portion of the front cover 33 covers the exhaust pipe support portion 33b provided on the front cover 33 and the downstream opening 24d of the downstream exhaust pipe 24, and extends obliquely upward and forward. And is attached to the muffler 30. The lower muffler support stay 19b fixed to the lower part of the front cover 33 is attached so as to extend forward from the left side surface of the front cover 33.

  The muffler 30 has a pair of muffler support stays 19 fixed to the internal combustion engine 11 with bolts, and the internal combustion engine 11 and the muffler 30 are connected.

  Since one embodiment of the present invention is configured as described above, the following effects can be obtained.

  An exhaust pipe 21 for discharging exhaust gas from the internal combustion engine 11 and a muffler 30 connected to a downstream side of the exhaust pipe 21 are provided.The muffler 30 includes a muffler body 32, and a front opening 32a of the muffler body 32. A front cover 33 that closes is provided, and a downstream exhaust pipe 24 of the exhaust pipe 21 is disposed inside the muffler 30.The exhaust pipe 21 extends rearward from the front of the vehicle inside the muffler 30, and then faces the front of the vehicle. The downstream end portion 24c of the downstream side exhaust pipe 24 is supported by an exhaust pipe support portion 33b provided on a muffler body 31 which is an outer shell of the internal combustion engine 30. It is possible to cope with the case where it is necessary to shorten the length, and since the exhaust pipe is supported using existing parts, the number of parts can be reduced and a simpler structure can be achieved, and the manufacturing cost can be reduced. And the exhaust system as a whole can be made lighter. Wear.

  Further, a muffler support stay 19 for connecting the internal combustion engine 11 and the muffler 30 is provided on the front cover 33, and an upper muffler support stay 19a above the muffler support stay 19 covers an exhaust pipe support portion 33b of the front cover 33. Therefore, even when the downstream end of the exhaust pipe 21 is supported by the front cover 33, the exhaust pipe 21 and the exhaust pipe support 33b of the front cover 33 are covered by the muffler support stay 19 that supports the muffler 30 that is an existing component. Thus, the downstream end 24c of the exhaust pipe 21 can be supported by the front cover 33 without the external appearance of the exhaust pipe supporting portion 33b being impaired and without impairing the appearance.

  Further, the exhaust pipe support portion 33b of the front cover 33 is a convex portion that swells into the muffler 30, and the downstream end 24c of the exhaust pipe 21 is connected to the exhaust pipe support portion 33b and the downstream end 24c of the exhaust pipe 21. Since either one is fitted and supported by the other, the downstream end 24c of the exhaust pipe 21 can be effectively supported by the front cover 33 with a simple structure.

  Furthermore, the muffler 30 is divided into a first expansion chamber 40 and a second expansion chamber 41 by arranging a partition wall 36 in the muffler 30, and a muffler inner portion 24 g of the exhaust pipe 21 arranged in the muffler 30. Is arranged in the first expansion chamber 40, so that the entire exhaust device 20 can be reduced in size.

  Further, since a communication hole 24 e communicating with the inside of the muffler 30 is provided in the exhaust pipe 24 on the downstream side of the exhaust pipe 21, the downstream end 24 c arranged in the muffler 30 is supported by the front cover 33 and the cap 34 Even if it is closed, the exhaust pipe 21 and the muffler 30 can be communicated. Further, by providing a plurality of communication holes 24 e in the exhaust pipe 24 on the downstream side of the exhaust pipe 21, the exhaust can be diffused into the muffler 30.

  FIG. 8 is a longitudinal sectional view of the vicinity of the exhaust pipe support portion 133b of the exhaust device 120 according to the second embodiment of the present invention. In the exhaust device 20 according to the first embodiment of the present invention, a convex portion protruding inward is formed on the upper part of the front surface of the front cover 33, and the downstream end portion 24c of the downstream exhaust pipe 24 is formed on the convex portion. However, in the exhaust device 120 of the second embodiment, a convex portion 133b protruding outward from the front cover 33 is formed, and the convex portion 133b is used as an exhaust pipe support portion 133b. The downstream end 24c of the exhaust pipe 24 is fitted into the exhaust pipe support 133b, and the downstream end 24c is supported by the front cover 33. Further, the downstream end 24c is closed by a cap 134 as a closing member.

  FIG. 9 shows a vertical cross-sectional view of the vicinity of the exhaust pipe support portion 233b of the exhaust device 220 according to the third embodiment of the present invention. In the exhaust device 20 according to the first embodiment of the present invention, the downstream end 24c of the downstream exhaust pipe 24 is fitted into the exhaust pipe support portion 33b of the front cover 33, and the downstream end of the exhaust pipe 21 is Although supported by the front cover 33, in the exhaust device 220 according to the third embodiment of the present invention, the exhaust pipe support portion 233b of the front cover 33 fits into the downstream end 24c of the downstream exhaust pipe 24. It is formed to be. The exhaust pipe support portion 233b is fitted in the downstream end 24c of the exhaust pipe 21 and is supported by the front cover 33. Further, in the exhaust pipe support portion 233b. The cap 234 as a closing member is fitted, and the downstream end 24c is closed.

  Further, FIG. 10 shows a vertical sectional view around the exhaust pipe support 333b of the exhaust device 320 according to the fourth embodiment of the present invention. In the exhaust device 20 according to the first embodiment of the present invention, the downstream opening 34d is closed by fitting the cap 34 into the downstream opening 34d of the downstream exhaust pipe 24. In the exhaust device 320 of the fourth embodiment, the front cover 33 is provided with an exhaust pipe support 333b projecting inward from the front cover 33. The exhaust pipe support portion 333b has a closed portion 334 whose front end is closed in advance, the exhaust pipe support portion 333b is fitted into the downstream end portion 24c of the exhaust pipe 21, and the downstream end portion 24c is attached to the front cover 33. While being supported, the downstream opening 34d is closed by a closing portion 334 provided integrally with the exhaust pipe supporting portion 333b. As described above, various design changes are possible for the exhaust pipe support.

  Another example of the exhaust device for a saddle-ride type vehicle is shown in FIGS. The exhaust device 50 includes an exhaust pipe 51 and a muffler 52, and the exhaust pipe 51 is disposed in the muffler 52 on the downstream side. The portion of the exhaust pipe 51 disposed in the muffler 52 is composed of a linear portion 51a formed substantially linearly and a curved portion 51b curved in a U-shape.

  The muffler 52 includes a muffler body 53 serving as an outer shell. The muffler body 53 includes a cylindrical muffler body 54, and a front cover 55 and a tail cover 56 that cover the front and rear openings. A first partition 57 and a second partition 58 are fixed inside the muffler body 53, and the muffler body 53 is divided into a first expansion chamber 62 and a second expansion The chamber 63 is partitioned into a third expansion chamber 64.

  An exhaust pipe component member 65 is attached to the front surface of the first partition wall 57. The curved portion 51b of the exhaust pipe 51 has a curved portion 57a formed by integrally bending a part of the first partition wall 57 backward, and an exhaust pipe configuration as a separate member attached to the front surface of the first partition wall 57. It comprises a curved portion 65a of the member 65 and a first tubular portion 65b and a second tubular portion 65c of the exhaust pipe component 65. The first cylindrical portion 65b is connected to a straight portion 51a of the exhaust pipe 51. The second cylindrical portion 65c is a downstream end portion 51c of the exhaust pipe 51 and opens to the first expansion chamber 62. By forming the curved portion 51b of the exhaust pipe 51 by the first partition wall 57 and the exhaust pipe constituent member 65, the flow of the exhaust gas flowing in the exhaust pipe 51 can be changed from the rear of the vehicle toward the front of the vehicle. And the number of parts can be reduced.

  A first communication pipe 59 is inserted into and fixed to the first partition wall 57, and the first expansion chamber 62 and the second expansion chamber 63 are connected by the first communication pipe 59. A second communication pipe 60 is inserted into and fixed to the second partition wall 58, and the second expansion chamber 63 and the third expansion chamber 64 are connected by the second communication pipe 60. A tail pipe 61 is inserted and fixed to the tail cover 56, and the third expansion chamber 64 communicates with the outside air.

  The exhaust gas discharged from the internal combustion engine 11 passes through the exhaust pipe 51 of the exhaust device 50, flows into the first expansion chamber 62, and flows from the first expansion chamber 62 to the first communication pipe 59, the second expansion chamber 63, and the second expansion chamber 63. The gas passes through the two communication pipes 60 and the third expansion chamber 64 and is discharged from the tail pipe 61 to the outside air.

  As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, and various other modifications are possible. Further, the internal combustion engine of the present invention is not limited to motorcycles but can be widely applied to other types of straddle-type vehicles.

DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Frame, 10 ... Power unit, 11 ... Internal combustion engine, 19 ... Muffler support stay, 19a ... Upper muffler support stay, 20 ... Exhaust device, 21 ... Exhaust pipe, 24 ... Downstream exhaust pipe, 24c ... Downstream end, 24d: downstream opening, 24e: communication hole, 30: muffler, 31 muffler body, 32: muffler body, 32a: front opening, 33 front cover, 33b: exhaust pipe support, 34: cap, 35 ... tail cover, 36 ... partition, 40 ... first expansion chamber, 41 ... second expansion chamber,
120: exhaust device, 133b: exhaust pipe support, 134: cap, 220: exhaust device, 233b: exhaust pipe support, 234: cap, 320: exhaust device, 333b: exhaust pipe support, 334: closing portion,
50 exhaust device, 51 exhaust pipe, 51b curved section, 52 muffler, 53 muffler body, 54 muffler body, 55 front cover, 56 tail cover, 57 first partition, 58 second Partition wall, 62: first expansion chamber, 63: second expansion chamber, 64: third expansion chamber, 65: exhaust pipe constituent member

Claims (6)

An exhaust pipe (21, 51) for discharging exhaust of the internal combustion engine (11), and a muffler (30, 52) connected to a downstream side of the exhaust pipe (21, 51), the muffler (30, 52) In the exhaust device of a straddle-type vehicle in which a downstream portion of the exhaust pipe (21, 51) is disposed inside,
The exhaust pipe (21, 51) extends rearward from the vehicle front in the muffler (30, 52), and then bends and extends toward the vehicle front,
The downstream end (24c, 65c) of the exhaust pipe (21, 51) is provided at an outer pipe part (31, 53) of the muffler (30, 52) with an exhaust pipe support (33b, 133b, 233b, 333b, 54, 57), which is supported by a straddle-type vehicle. The muffler (30) has a partition (36) disposed in the muffler (30), and is divided into a first expansion chamber (40) and a second expansion chamber (41),
2. The exhaust pipe according to claim 1, wherein an entire part of the muffler inside the muffler disposed in the muffler is disposed in the first expansion chamber. 3. An exhaust device for a straddle-type vehicle according to any of the preceding claims. The outer shell (31) of the muffler (30) includes a muffler body (32) and a front cover (33) for closing a front opening (32a) of the muffler body (32).
The exhaust pipe support portion (33b, 133b, 233b, 333b) is provided on the front cover (33),
A stay (19) for connecting the internal combustion engine (11) and the muffler (30) is provided on the front cover (33),
The said stay (19a) covers the said exhaust pipe support part (33b, 133b, 233b, 333b) of the said front cover (33), The saddle riding type vehicle of Claim 1 or Claim 2 characterized by the above-mentioned. Exhaust device. The exhaust pipe support portion (33b, 133b, 233b, 333b) of the front cover (33) is a convex portion (33b, 133b, 233b, 333b) from which a part of the muffler (30) protrudes,
At the downstream end (24c) of the exhaust pipe (21), one of the projection (33b, 133b, 233b, 333b) and the downstream end (24c) of the exhaust pipe (21) is fitted to the other. The exhaust device for a straddle-type vehicle according to any one of claims 1 to 3, wherein the exhaust device is supported together. The downstream opening (24d) of the downstream end (24c) of the exhaust pipe (21) is closed by a closing portion (34, 134, 234, 334),
The communication port (24e) communicating with the inside of the muffler (30) is provided in the downstream portion (24) of the exhaust pipe (21), The communication hole according to any one of claims 1 to 4, wherein An exhaust device for a straddle-type vehicle according to any of the preceding claims.   An exhaust pipe supporting portion (54, 57) supporting a downstream end (65c) of the exhaust pipe (51) is a part of a partition (57) fixed to an outer shell (53) of the muffler (52). The exhaust device for a saddle-ride type vehicle according to claim 1, wherein:

Images