JP4612070B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle in which a silencer is disposed above a rear wheel.

  2. Description of the Related Art Conventionally, as an exhaust device for a motorcycle, there is a so-called up-muffler in which a silencer is disposed at a relatively high position near the upper portion of a rear wheel. Equipped with this up muffler is that the silencer is mounted at a high position, so that the bank angle of the vehicle body is increased while the large silencer is installed, and the air resistance during running is reduced. This is because it can.

Examples of conventional motorcycles equipped with this type of up-muffler include those disclosed in Patent Document 1 and Patent Document 2, for example.
The motorcycle disclosed in Patent Document 1 is provided with a rear cowl behind the seat, and a silencer is disposed in the rear cowl and above the rear wheel. This silencer is formed to have a box shape, and the downstream end of the exhaust pipe is connected to the front end of the vehicle body, and the tail pipe for exhaust gas discharge is connected to the rear end of the vehicle body. Yes.

  The exhaust pipe extends upward from a collecting chamber provided below the pivot shaft of the rear arm of the motorcycle through the right side of the front portion of the rear arm, and a downstream end is directed to the silencer near the lower part of the seat. Is bent backwards. The collecting chamber is connected to an exhaust passage for each cylinder of the engine, and is configured to guide the exhaust gas of each cylinder to the exhaust pipe.

On the other hand, the silencer of the motorcycle disclosed in Patent Document 2 is disposed in the vicinity of the upper side of the rear wheel, and an exhaust pipe connecting the silencer and the engine is an intake passage for each cylinder below the engine. Are formed so as to gather together, and extend from this gathering portion to the silencer behind the engine and under the seat. In this way, when the exhaust pipe extends in the vertical direction at the center of the rear side of the engine and in the vehicle width direction, the exhaust pipe has a front space formed between the pivot shaft of the rear arm and the cross member. Is passed through in the vertical direction.
Japanese Patent No. 2723311 JP-A-9-96217

  In the conventional motorcycle described in Patent Document 1, the exhaust pipe extends below the seat and extends in the vertical direction on the right side of the front portion of the rear arm, and the leg of the passenger seated on the seat approaches the exhaust pipe. Therefore, in order to prevent the heat of the exhaust pipe from being transmitted to the occupant's legs, a heat shielding member must be attached. In order to prevent the heat of the exhaust pipe from being transmitted to the occupant's legs in this way, a large and thick member for heat shielding must be used, so that the occupant can move the legs. Becomes narrower. In other words, the motorcycle disclosed in Patent Document 1 has a problem that the occupant is forced to have a tight posture.

Such a problem can be solved to some extent by adopting a configuration in which the exhaust pipe passes through the front space of the rear arm as in the motorcycle described in Patent Document 2. This is because a special heat shielding member is not required because the exhaust pipe is separated from the passenger's leg.
However, if the exhaust pipe is formed so as to pass through the center portion in the vehicle width direction, the rear cushion unit provided between the rear arm front portion and the vehicle body frame and the pipe may interfere with each other. is there.

  The present invention has been made to solve such problems, and the exhaust pipe and the rear cushion unit are arranged in the front part of the rear arm and in the vicinity of the center part in the vehicle width direction while avoiding interference with each other. The purpose is to be able to.

In order to achieve this object, a motorcycle according to the present invention includes a body frame, an engine composed of a plurality of cylinders , a rear wheel, a thin box-like silencer disposed above the rear wheel, An exhaust pipe connecting the silencer and the engine, and a pair of left and right arm bodies supported on the vehicle body frame so as to be swingable in a vertical direction via a pivot shaft, and suspended between the pair of left and right arm bodies. A rear arm having a cross member and a rear cushion unit interposed between the vehicle body frame and the rear arm, and the rear cushion unit is disposed offset to one side in the vehicle width direction in plan view. The exhaust pipe gathers exhaust passages for each cylinder to form only one, and passes through a front space formed between the pivot shaft of the rear arm and the cross member. To extend, between the front portion portion and the muffler extending upwardly through the space in the exhaust pipe, the other in the vehicle width direction to be a direction opposite to the deflection direction of the rear cushion unit in a plan view The connecting portion between the exhaust pipe and the silencer is provided at one place displaced to the same side as the displacement direction of the exhaust pipe in a plan view at the front end portion of the silencer. is there.

  The motorcycle according to the invention described in claim 2 is the motorcycle according to the invention described in claim 1, wherein a catalyst storage pipe for storing the catalyst is provided in a portion passing through the front space of the rear arm in the exhaust pipe. It is what.

Motorcycle according to the invention described in claim 3, Oite the motorcycle according to the invention described in claim 1, site located between the muffler and the front portion space in the exhaust pipe in a plan view In this case, the rear wheel is displaced outwardly in the vehicle width direction and is disposed above and to the side of the rear wheel.

  A motorcycle according to a fourth aspect of the present invention is the motorcycle according to the third aspect of the present invention, wherein the body frame includes a pair of left and right seat rails for supporting a seat, and the displacement portion of the exhaust pipe These are arranged inside the vehicle body from the pair of left and right seat rails in plan view.

A motorcycle according to a fifth aspect of the present invention is the motorcycle according to the third aspect of the present invention, wherein a concave portion that protrudes upward is formed at a center portion of the bottom wall of the silencer in the vehicle width direction. Is formed.

The motorcycle according to the invention described in claim 6 is the motorcycle according to the invention described in claim 3, wherein the silencer is formed at a position displaced to the same side as the exhaust pipe at the front end, It includes an exhaust gas inflow portion into which exhaust gas flows and a tail pipe that protrudes from at least two locations in the vehicle width direction of the rear end portion and exhausts exhaust gas.

According to the present invention, the exhaust pipe and the rear cushion unit can be disposed in the front part of the rear arm and in the vicinity of the center part in the vehicle width direction so as not to interfere with each other. In addition, since the portion between the silencer and the portion of the exhaust pipe that bends laterally below the seat can be formed in a straight line in plan view, the exhaust pipe is formed to bend to the side. Despite being present, the increase in exhaust resistance can be prevented.

  According to the second aspect of the present invention, the arm body of the rear arm substantially functions as a heat shielding member, and prevents the heat of the catalyst from being transmitted to the occupant's legs. For this reason, the heat transmitted to the passenger's leg from the exhaust pipe side can be further reduced.

According to the invention described in claim 3, since the exhaust pipe is formed to avoid contact with the rear wheel below the seat, the exhaust pipe is extended upward to avoid contact with the rear wheel. The sheet can be positioned at a lower position as compared with the case of doing so. For this reason, the seat can be positioned at a relatively low position even though the exhaust pipe is configured such that the exhaust pipe is separated from the occupant's legs through the front space S of the rear arm.
Therefore, according to the present invention, it is possible to prevent the heat of the exhaust pipe from being transmitted to the occupant's legs without using a special heat shielding member, and it is possible to dispose the seat at a position where driving is easy. it can.

  According to the fourth aspect of the present invention, the curved portion of the exhaust pipe can be separated from the passenger's leg toward the inside of the vehicle body, so that the heat of the exhaust pipe is more difficult to be transmitted to the passenger's leg.

According to the fifth aspect of the invention, since the position of the silencer can be lowered by the amount of the recess, the sheet positioned above the silencer can be provided at a relatively low position. For this reason, the center of gravity of the vehicle body in a state where the occupant is seated on the seat can be lowered, and a motorcycle that can be driven more easily can be provided.

According to the sixth aspect of the present invention, the exhaust port can be formed with a smaller diameter as compared with the case where the exhaust gas is discharged from one place, and accordingly the thickness of the silencer can be reduced. For this reason, the sheet | seat located above a silencer can be provided in a relatively low position. For this reason, it is possible to provide a motorcycle that can lower the center of gravity of the vehicle body in a state in which an occupant is seated and that is easier to drive.

Hereinafter, an embodiment of a motorcycle according to the present invention will be described in detail with reference to FIGS.
FIG. 1 is a side view of a motorcycle according to the present invention, FIG. 2 is a plan view, and FIG. 3 is a rear view. 4 is an enlarged side view showing the seat portion, FIG. 5 is an enlarged side view showing the silencer mounting portion, and FIG. 6 is a plan view. 7 is a side view of the exhaust device and the rear arm, FIG. 8 is also a plan view, FIG. 9 is a plan view of the grab bar, FIG. 10 is a side view of the rear end of the exhaust pipe and the silencer, and FIG. 12 is a sectional view taken along line XII-XII in FIG. 4, and FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12 and 13 show only the left side of the vehicle body from the center line C in the horizontal direction of the vehicle body.

  In these drawings, reference numeral 1 denotes a motorcycle according to this embodiment. In the motorcycle 1, a silencer 4 (see FIGS. 4 and 5) is disposed between the seat 2 and the rear wheel 3. 5 is a front wheel of the motorcycle 1, 6 is a front fork, 7 is a steering handle, 8 is a front cowling, 9 is a fuel tank, 10 is a body frame, 11 is a water-cooled 4-cycle 4-cylinder engine, and 12 is this The exhaust pipe of the engine 11 is shown.

  The body frame 10 of the motorcycle 1 has the same configuration as that of a conventional motorcycle, and a rear arm bracket 14 is provided at the rear end of the pair of left and right tank rails 13. A driver footrest 16 is attached to the rear arm bracket 14 via a stay 15, and a rear arm 18 is supported via a pivot shaft 17 so as to be swingable in the vertical direction. As shown in FIGS. 7 and 8, the rear arm 18 includes a cylindrical body 19 that passes through the pivot shaft 17 and is supported by the pivot shaft 17, and a left and right that extends from both ends of the cylindrical body 19 toward the rear of the vehicle body. The arm main body 20 includes a pair of arm main bodies 20 and a cross member 21 that is horizontally mounted between the front portions of the arm main bodies 20. A front space S is formed between the cross member 21 and the cylindrical body 19 and between the arm main bodies 20.

  The cross member 21 is provided with a bracket 23 that pivotally supports the lower end portion of the rear cushion unit 22. As shown in FIG. 8, the bracket 23 is provided so as to be located on the left side of the vehicle body from the center line C in the vehicle width direction. As shown in FIG. 7, the rear cushion unit 22 is interposed between the bracket 23 and a pressure receiving member (not shown) at the upper part of the vehicle body frame in a state of being inclined forward and upward.

  A pair of left and right seat rails 24 and 24 (see FIG. 4) for supporting the seat 2 are attached to the rear end portion of the tank rail 13. Each of the seat rails 24, 24 is formed by a pipe having a circular cross section, and the rear end portion of the backstay 26 is welded to the intermediate portion in the front-rear direction via the gusset plate 25, and the rear end portions are separated from each other. They are connected to each other by a cross member 27 (see FIGS. 5 and 6). Further, as shown in FIG. 6, the seat rail 24 has a central portion in the front-rear direction protruding outward from the vehicle body, and is formed in a shape that substantially conforms to the outer shape of the seat 2 in plan view.

The seat 2 is formed by integrally forming a driver's seat 2a and a passenger's seat 2b, and is attached to the seat rail 24 while being placed on the seat rail 24.
As shown in FIGS. 1 and 4, the part for attaching the seat 2 to the seat rail 24 includes a grab bar 28 located in the vicinity of the passenger seat 2 b, a seat cowl 29 formed integrally with the grab bar 28, The front side cover 30 and the rear side cover 31 are covered so as not to appear in the appearance of the vehicle body.

  The grab bar 28 is gripped when the passenger sitting on the passenger seat 2 stabilizes the upper body or when the passenger lifts the rear part of the vehicle body to stand the main stand 100 (see FIG. 1). As shown in FIGS. 5 and 9, the seat cowl 29 is formed integrally with the rear end portion so as to be symmetrical in the left-right direction of the vehicle body. The grab bar 28 includes a bar 32 that extends in the front-rear direction of the vehicle body inside the vehicle body, a grip 33 that protrudes outward from the front end portion of the bar 32 and extends rearward of the vehicle body, and a rear end portion of the grip 33 and the bar 32. The stay 34 is connected to the rear end portion of the rear end, and these are integrally formed with the seat cowl 29 by molding.

The grab bar 28 is attached to the vehicle body by a front attachment bracket 35 projecting downward from the front end portion of the grab bar 28 and a rear attachment provided to extend from the rear part of the bar 32 to the vehicle body inside. This is done by attaching the brackets 36 to the body frame 10 respectively.
As shown in FIG. 5, the front mounting bracket 35 is mounted on a mounting plate 37 welded to the gusset plate 25 by mounting bolts 38 from the outside of the vehicle body.

  As shown in FIGS. 6 and 13, the rear mounting bracket 36 is mounted on the cross member 27 by mounting bolts 39 from above while being placed on the cross member 27. In FIG. 13, the reference numeral 41 provided inside the vehicle body of the rear mounting bracket 36 is a mounting plate for supporting the silencer 4 described later. The mounting plate 41 is mounted on the cross member 28 by two mounting bolts 42.

  As shown in FIG. 9, the seat cowl 29 is formed by side walls 43, 43 in the left-right direction of the vehicle body and an upper wall 44 extending substantially horizontally so as to connect the upper ends of the side walls 43, 43. Has been. In the seat cowl 29 according to this embodiment, reinforcing ribs 45 extending in the vertical direction are integrally formed on the inner side surfaces of the side walls 43, and the taillight 46 (see FIGS. 4 and 4) is formed through the reinforcing ribs 45. 5).

  The front side cover 30 is formed so as to have a cross-sectional shape as shown in FIG. 12, and pins 47 (see FIGS. 4 and 12) projecting toward the inside of the vehicle body at both ends in the front-rear direction. It is attached to the seat rail 24 and the rear side cover 31 via the intermediate part. As shown in FIG. 12, the pin 47 is engaged with a grommet 48 supported by the vehicle body frame 10 or the rear side cover 31.

  The rear side cover 31 extends in the front-rear direction along the bar 32 of the grab bar 28 and is formed to have a U-shape that opens toward the front side of the vehicle body in plan view. The right part is connected below the taillight 46. Further, as shown in FIG. 12, the front end portion of the rear side cover 31 is formed so as to face the inner side of the rear end portion of the front side cover 30, and the grommet 48 is provided in the inner portion. . Further, although not shown, the upper end portion of the rear side cover 31 is extended and engaged with the inside of the bar 32 so that the inside of the cover cannot be seen from below the bar 32. It is configured. The engagement hole of the bar 32 with which the upper end portion of the rear side cover 31 is engaged is indicated by reference numeral 32a in FIG.

  As shown in FIGS. 7 and 8, the exhaust pipe 12 is formed so that exhaust passages for each cylinder are gathered together under the engine 11, and the front space S of the rear arm 18 is formed from this gathered portion. And is connected to a silencer 4 located between the seat 2 and the rear wheel 3. More specifically, the exhaust pipe 12 includes four first exhaust pipes 51 provided for each cylinder of the engine 11, and a collecting passage extending rearward from the downstream end portion of the first exhaust pipes 51. A forming member 52, a second exhaust pipe 53 extending rearward and upward from the rear end portion of the passage forming member 52, and an upper end portion of the second exhaust pipe 53 are attached to the front space S in the vertical direction. A catalyst housing pipe 54 that passes therethrough and a third exhaust pipe 55 that is provided below the seat 2 and connects the catalyst housing pipe 54 and the silencer 4 are configured.

  As shown in FIG. 8, the collecting passage forming member 52 is formed to have a Y shape in plan view, and includes a left upstream portion 52 a that collects the exhaust passages of the two cylinders on the left side of the vehicle body, A right upstream portion 52b that collects the exhaust passages of the two cylinders on the right side of the vehicle body and a downstream portion 52c that collects the exhaust passages of these upstream portions are integrally formed.

  The second exhaust pipe 53 is formed by a pipe bent so as to have an L shape in a side view. As shown in FIG. 8, the downstream end of the second exhaust pipe 53 is formed so as to be offset from the center line C in the vehicle width direction to the right side of the vehicle body in plan view. Further, the downstream end is formed so as to incline in a state where it is gradually positioned on the right side of the vehicle body as it goes upward. Although not shown, the second exhaust pipe 53 and the collecting passage forming member 52 are supported by the rear arm bracket 14 via a stay (not shown).

As is well known in the art, the catalyst storage pipe 54 stores a carrier such as alumina supporting a catalyst metal, and as shown in FIG. 7, upstream connection pipes 54a and The downstream connection pipe 54b is welded and connected to the second exhaust pipe 53 and a third exhaust pipe 55 described later via these pipes 54a and 54b. The catalyst housing pipe 54 is located on the same axis as the downstream end of the second exhaust pipe 53, and is provided in the front space S of the rear arm 18 so as to penetrate the space in the vertical direction. The position where the catalyst storage pipe 54 is provided is positioned in the front space S so as to deviate from the center line C to the right side of the vehicle body.
The downstream connection pipe 54b connected to the upper end portion of the catalyst housing pipe 54 is formed so that the downstream end is bent so as to face the rear upper part of the right side of the vehicle body. As shown in FIG. It is connected to the third exhaust pipe 55 at a position overlapping the rear cushion unit 22.

  As shown in FIGS. 8 and 11, the third exhaust pipe 55 is formed to be curved in a shape that is convex toward the right side of the vehicle body in plan view. The portion of the exhaust pipe between the silencer and the front space of the rear arm is constituted by the third exhaust pipe and the downstream connection pipe 54 b of the catalyst storage pipe 54. The front half portion 55a of the third exhaust pipe 55 extends so as to be gradually positioned on the right side of the vehicle body as it goes rearward on the same axis as the rear end portion of the pipe 54b, and the rear half portion 55b goes rearward. Accordingly, it is extended so as to be gradually located on the vehicle body center side. As shown in FIG. 6, the curved portion 55c, which is a connecting portion between the front half portion 55a and the rear half portion 55b, is positioned on the vehicle body inner side from the seat rail 24 on the right side of the vehicle body in a plan view. As shown in FIG. 4, the rear wheel 3 is positioned on the right side of the upper part.

  In the side view shown in FIG. 7, the curved portion 55c is curved in the vertical direction so that the inclination angle of the rear half portion 55b with respect to the horizontal is larger than the inclination angle of the front half portion 55a. The rear end portion of the rear half portion 55b is formed so that the inclination angle becomes as small as that of the front half portion 55a in order to connect to the silencer 4. More specifically, as shown in FIG. 7, the third exhaust pipe 55 is formed with a downward curved portion 55d so as to protrude downward from an imaginary line L connecting the front end and the rear end in a side view. Yes.

  The muffler 4 connected to the rear end portion of the third exhaust pipe 55 is formed so that the overall shape is a thin box shape, and a plurality of expansion chambers (not shown) are provided therein. 5, 11, and 12, the mounting bracket 56 welded to the substantially central portion of the upper surface in the front-rear direction, and the mounting plate attached to the bracket 56 via a grommet 57. 41 to the cross member 27. The grommet 57 is attached to the attachment plate 41 in a state where the axial direction is oriented in the front-rear direction of the vehicle body, and the attachment bolt 58 penetrates from the rear of the vehicle body, and the bracket 56 of the silencer 4 is penetrated by the bolt 58. Is installed.

The silencer 4 has an end portion on the front side of the vehicle body and a downstream end portion of the third exhaust pipe 55 welded to an end portion on the right side of the vehicle body, and two tail pipes on the end portion on the rear side of the vehicle body. 61 protrudes in a state of being lined up in the left-right direction. That is, the silencer 4 has a configuration in which exhaust gas flows from one place of the front end portion to which the third exhaust pipe 55 is connected and exhaust gas is discharged from two places in the vehicle width direction at the rear end portion. Has been. An exhaust gas inflow portion referred to in the invention according to claim 6 is constituted by one place of the front end portion. The tail pipe 61 is formed to have an outer diameter smaller than the thickness of the silencer 4, and in order to prevent a protector 62 (see FIG. 4), which will be described later, from being excessively heated by the high temperature tail pipe 61. Is surrounded by an outer cylinder 63. The outer cylinder 63 is formed with an outer diameter that forms an annular space with the tail pipe 61, and is attached to the body portion of the silencer 4 via an attachment stay 64.

Further, as shown in FIG. 12, the silencer 4 is formed with a concave portion 65 that protrudes upward in a center portion in the vehicle width direction, which is a half portion of the bottom wall on the vehicle body front side.
Furthermore, as shown in FIG. 1 and FIG. 4, the silencer 4 has a structure for covering the silencer 4 exposed to the outside of the rear side cover 31 and the outer cylinder. A protector 62 is attached. The protector 62 is made of a synthetic resin material having high heat resistance, and its front end is rotatably engaged with pins 66 projecting from both sides of the silencer 4 on the front side of the vehicle body. The support piece 67 provided on the mounting stay 64 of the cylinder 63 is engaged from behind. The connecting portion between the support piece 67 and the protector 62 is configured to be easily detached when the rear end portion of the protector 62 is lifted upward. By adopting this configuration, it is possible to prevent the protector 62 made of synthetic resin from being damaged when attempting to lift the rear part of the vehicle body with the protector 62.

In the motorcycle 1 configured as described above, since the exhaust pipe 12 is disposed inside the vehicle body through the front space S of the rear arm 18, the driver sitting on the seat 2 puts his / her leg on the footrest 16. In the mounted state, the exhaust pipe 12 is separated from the leg toward the inside of the vehicle body. This makes it difficult for the heat of the exhaust pipe 12 to be transmitted to the driver's legs, even though no special heat shielding member is used. The exhaust pipe 12 is formed such that a portion (third exhaust pipe 55) between the silencer 4 and the front space S of the rear arm 18 is convex and curved toward the right side of the vehicle body in plan view. 3 is positioned so as to avoid contact with the rear wheel 3 below the seat 2 to the side.
For this reason, the position of the seat 2 can be lowered as compared with the case where the exhaust pipe 12 is extended upward in order to avoid contact with the rear wheel 3, so that the exhaust pipe 12 is connected to the front space S of the rear arm 18. The seat 2 can be positioned at a relatively low position while being configured so that the exhaust pipe 12 is separated from the occupant's leg by passing through.

In the motorcycle 1 according to this embodiment, the curved portion 55c of the third exhaust pipe 55 is positioned on the inner side of the vehicle body from the seat rail 24 on the right side of the vehicle body in a plan view. It can be separated inward.
In the motorcycle 1 according to this embodiment, the right side in which the connection portion of the third exhaust pipe 55 to the silencer 4 is the same direction as the convex direction (right direction) in the plan view of the third exhaust pipe 55. Therefore, the portion of the third exhaust pipe 55 between the curved portion 55c and the silencer 4 can be formed linearly in plan view. For this reason, although the third exhaust pipe 55 is formed so as to bend to the side, it is possible to prevent the exhaust resistance from increasing.

In the motorcycle 1 according to this embodiment, since the concave portion 65 that protrudes upward is formed at the center of the bottom wall of the silencer 4 in the vehicle width direction, the amount of the silencer 4 corresponding to the concave portion 65 is formed. The position of the vehicle body can be lowered, and the center of gravity of the vehicle body can be lowered when an occupant is seated on the seat 2.
In the motorcycle 1 according to this embodiment, the catalyst housing pipe 54 is provided in a portion passing through the front space S of the rear arm 18 in the exhaust pipe 12, so that the temperature of the catalyst housing pipe 54 becomes higher than that of the exhaust pipe 12. The arm main body 20 of the rear arm 18 is located on the side of this, and this arm main body 20 effectively functions as a heat shielding member. For this reason, it is possible to equip the catalyst while configuring so that the heat of the catalyst housing tube 54 is not easily transmitted to the occupant's legs.

  In the motorcycle 1 according to this embodiment, the portion of the exhaust pipe 12 that passes through the front space S of the rear arm 18 is located on the vehicle body right side (the direction in which the curved portion 55c of the third exhaust pipe 55 is convex). Since the lower end of the rear cushion unit 22 is mounted at a position biased to the left side of the vehicle body (the direction opposite to the direction in which the exhaust pipe 12 is biased) in the cross member 21 of the rear arm 18, the exhaust pipe 12 and the rear cushion unit 22 interfere with each other. While avoiding this, the front arm of the rear arm 18 can be disposed near the center in the vehicle width direction.

In the motorcycle 1 according to this embodiment, the curved portion 55c of the third exhaust pipe 55 is formed with a downward curved portion 55d that protrudes downward when viewed from the side. The seat 2 above the third exhaust pipe 55 can be positioned low.
In the silencer 4 of the motorcycle 1 according to this embodiment, the exhaust gas flows from one place of the front end portion to which the third exhaust pipe 55 is connected, and the exhaust gas flows from two places in the rear end portion and in the vehicle width direction. Since the exhaust gas is discharged, the discharge port (tail pipe 61) can be formed with a small diameter compared with the case where the exhaust gas is discharged from one place, and the thickness of the rear end portion of the silencer 4 is reduced accordingly. Can do. By forming the silencer 4 to be thin, the height of the sheet 2 can be further reduced.

1 is a side view of a motorcycle according to the present invention. 1 is a plan view of a motorcycle according to the present invention. 1 is a rear view of a motorcycle according to the present invention. It is a side view which expands and shows a sheet | seat part. It is a side view which expands and shows a silencer attachment part. It is a top view which expands and shows a silencer attachment part. It is a side view of an exhaust device and a rear arm. It is a top view of an exhaust device and a rear arm. It is a top view of a grab bar. It is a side view of a rear end part of an exhaust pipe and a silencer. It is a top view of the rear end part of an exhaust pipe, and a silencer. It is the XII-XII sectional view taken on the line in FIG. It is the XIII-XIII sectional view taken on the line in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Seat, 3 ... Rear wheel, 4 ... Silencer, 11 ... Engine, 12 ... Exhaust pipe, 17 ... Pivot shaft, 18 ... Rear arm, 20 ... Arm main body, 21 ... Cross member, 22 ... Rear Cushion unit, 24 ... seat rail, 51 ... first exhaust pipe, 52 ... passage forming member, 53 ... second exhaust pipe, 54 ... catalyst housing pipe, 55 ... third exhaust pipe, 55a ... front half, 55b ... rear half, 55c ... curved part, 55d ... downward curved part, 61 ... tail pipe, 65 ... concave part, S ... front part space.

Claims (6)

Body frame,
An engine consisting of multiple cylinders ,
The rear wheel,
A thin box-like silencer disposed above the rear wheel;
An exhaust pipe connecting the silencer and the engine;
A rear arm having a pair of left and right arm bodies supported by a vehicle body frame so as to be swingable in a vertical direction via a pivot shaft, and having a cross member suspended between the pair of left and right arm bodies ;
A rear cushion unit interposed between the vehicle body frame and the rear arm,
The rear cushion unit is arranged to be deviated to one side in the vehicle width direction in a plan view,
The exhaust pipe collects only one exhaust passage for each cylinder, and extends upward through a front space formed between the pivot shaft of the rear arm and the cross member,
Between the portion of the exhaust pipe that extends upward through the front space and the silencer, the silencer is disposed on the other side in the vehicle width direction that is opposite to the displacement direction of the rear cushion unit in plan view.
The connecting portion between the exhaust pipe and the silencer is provided at one position displaced to the same side as the displacement direction of the exhaust pipe in a plan view at the front end portion of the silencer. Motorcycle.   2. The motorcycle according to claim 1, wherein a catalyst storage pipe for storing a catalyst is provided in a portion of the exhaust pipe that passes through the front space of the rear arm. Oite motorcycle according to claim 1, site located between the muffler and the front portion space in the exhaust pipe is displaced outward in the vehicle width direction in a plan view, the upper and the rear wheel A motorcycle characterized by being arranged on a side. The motorcycle according to claim 3, wherein the body frame includes a pair of left and right seat rails that support a seat,
The motorcycle according to claim 1, wherein the displacement portion of the exhaust pipe is disposed on the inner side of the vehicle body with respect to the pair of left and right seat rails in plan view.   4. The motorcycle according to claim 3, wherein a concave portion that protrudes upward is formed at a center portion of the bottom wall of the silencer in the vehicle width direction.   The motorcycle according to claim 3, wherein the silencer is formed at a position displaced to the same side as the exhaust pipe at the front end portion, and an exhaust gas inflow portion into which exhaust gas flows and a vehicle width direction at the rear end portion And a tail pipe that protrudes from at least two locations from which exhaust gas is discharged.

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