JP2013060029A - Saddle-riding type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that can reduce exhaust resistance.SOLUTION: A motorcycle 10 includes: a vehicle frame 11 having a head pipe 21 and a down frame 23 extending downward from the head pipe 21; an exhaust pipe 51 extending from an engine 12; and a muffler 55 connected to a tip end of the exhaust pipe 51. The exhaust pipe 51 extends forward on one side in a vehicle width direction from a front side of the engine 12 to detour around a front side of the down frame 23, extends on the other side in a vehicle width direction of the engine 12 and then extends backward the vehicle body, extends on one side in a vehicle width direction from the other side in a vehicle width direction behind the engine 12, and is connected to the muffler 55 disposed on a lateral side of the vehicle frame 11.

Description

  The present invention relates to an improvement in a saddle-ride type vehicle having an exhaust pipe.

  A saddle-riding type vehicle is known in which an exhaust pipe extends from an engine and a silencer is connected to the tip of the exhaust pipe (see, for example, Patent Document 1 (FIGS. 1, 2, and 5)).

  As shown in FIG. 2 of Patent Document 1, an exhaust pipe (23) extends forward from the exhaust passage (35) of the cylinder (27). The exhaust pipe (23) is connected to a silencer (26) as shown in FIG.

  Incidentally, as shown in FIG. 5 of Patent Document 1, the exhaust pipe (23) extends toward the chart side toward the down frame (5), but to the right side of the vehicle so as not to hit the down frame (5). Bend. That is, as shown in FIG. 2 of Patent Document 1, the exhaust pipe (23) is bent with a small radius of curvature so as not to hit the down frame (5). When the radius of curvature of the front portion of the exhaust pipe (23) becomes small, the flow resistance (hereinafter referred to as “exhaust resistance”) of the exhaust gas flowing in the exhaust pipe becomes large, and the exhaust resistance can be reduced there. Technology is desired.

Japanese Patent No. 4152998

  An object of the present invention is to provide a technique capable of reducing exhaust resistance.

  The invention according to claim 1 is a vehicle body frame having a head pipe and a down frame extending downward from the head pipe, an engine suspended on the vehicle body frame and disposed behind the down frame, and extending from the engine. In a saddle-ride type vehicle equipped with an exhaust pipe and a silencer that is connected to the tip of the exhaust pipe and is attached to the vehicle body frame behind the engine, the exhaust pipe extends from the front of the engine to one side in the vehicle width direction. Extends, bypasses the front of the down frame, extends to the other side in the vehicle width direction of the engine, then extends to the rear of the vehicle, and extends from the other side of the vehicle width direction to the one side in the vehicle width direction at the rear of the engine. It is connected to the silencer arranged in the direction.

  In the invention according to claim 2, a rear cushion is arranged at the center in the vehicle width direction behind the engine, and between the engine and the rear cushion, from the other side in the vehicle width direction of the exhaust pipe to one side in the vehicle width direction. It is characterized in that an extending part is placed.

  In the invention according to claim 3, the portion of the exhaust pipe that extends rearward of the vehicle on the other side in the vehicle width direction of the engine is disposed outside the cam chain chamber provided in the cylinder portion of the engine in the vehicle width direction. It is characterized by that.

  The invention according to claim 4 is provided with a clutch cover that covers the clutch device on one side in the vehicle width direction of the engine, an intake device on the vehicle rear side of the engine, and the exhaust pipe from the other side in the vehicle width direction. It is characterized by being inclined upward toward one side and detouring behind and above the clutch cover.

  The invention according to claim 5 is characterized in that a portion of the exhaust pipe extending in the longitudinal direction of the vehicle on the side of the cylinder has a divided structure that can be separated in the longitudinal direction.

  The invention according to claim 6 is characterized in that a bypass passage capable of changing exhaust characteristics by connecting the upstream side and the downstream side of the exhaust pipe is provided on one side in the vehicle width direction of the engine.

  The invention according to claim 7 is characterized in that the bypass passage is provided with an expansion chamber having an inner diameter larger than the inner diameter of the bypass passage.

  In the invention according to claim 1, since the exhaust pipe extending from the engine to the silencer is disposed so as to bypass the front of the down frame, the curvature radius of the exhaust pipe becomes large. If the radius of curvature of the exhaust pipe increases, the exhaust resistance can be reduced.

In addition, since the exhaust pipe crosses in the vehicle width direction at the front and rear of the engine, the exhaust pipe can be lengthened. If the exhaust pipe becomes longer, engine performance can be improved particularly at low and medium speeds.
As a result of the exhaust resistance of the exhaust gas being reduced and the exhaust pipe being lengthened, the engine performance can be enhanced.

In the invention according to claim 2, the exhaust pipe extends in the center in the vehicle width direction between the engine and the rear cushion. When the rear cushion receives a force, the length of the rear cushion is shortened, and the lower end of the rear cushion is raised and tilted rearward of the vehicle.
If the exhaust pipe is arranged behind the rear cushion, it is necessary to arrange the exhaust pipe further to the rear of the vehicle in consideration of the tilting of the rear cushion.
In this regard, in the present invention, the exhaust pipe is disposed in front of the rear cushion in the vehicle, so that the rear cushion can be disposed without considering the tilt of the rear cushion.

In the invention according to claim 3, a portion of the exhaust pipe that extends rearward of the vehicle on the other side of the engine is disposed outside the cam chain chamber of the engine in the vehicle width direction.
Since the cam chain chamber of the engine is filled with air and this air exerts a heat insulating action, even if an exhaust pipe is arranged in the vicinity of the cam chain chamber, the thermal influence on the cylinder bore portion of the engine is small. Therefore, the exhaust pipe can be disposed closer to the engine. By disposing the exhaust pipe close to the engine, a large space for moving the occupant legs can be secured and the operability of the vehicle can be improved.

  In the invention according to claim 4, the size of the clutch device can be increased by the amount of the exhaust pipe inclined upward from the other side in the vehicle width direction toward one side in the vehicle width direction. By increasing the size of the clutch device, the durability of the clutch can be increased.

  In the invention which concerns on Claim 5, the part extended in the vehicle front-back direction among exhaust pipes was set as the division | segmentation structure which can be separated into the front-back. The part that can be easily accessed from the outside of the vehicle on the side of the cylinder is made into an exhaust pipe with a split structure, so that the exhaust pipe can be partially detached, so the exhaust pipe and the rear cushion and intake air Maintainability for system parts and the like can be improved.

  In the invention according to claim 6, in addition to the main exhaust passage having a long pipe length, a short bypass passage for connecting the upstream side and the downstream side of the main exhaust passage is provided. The cross-sectional area of the exhaust passage increases by the amount corresponding to the bypass passage. As a result, exhaust loss can be reduced, and engine performance can be further enhanced.

  In the invention which concerns on Claim 7, an expansion chamber is provided in a bypass channel. By this expansion chamber, the flow rate of the exhaust gas is reduced, and a silencing effect can be exhibited.

1 is a left side view of a motorcycle according to the present invention. It is a principal part enlarged view of FIG. It is a side view of an exhaust pipe. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 is a cross-sectional view of an engine provided in a motorcycle. It is a front view of a down frame and its peripheral part. Fig. 2 is a right side view of a main part of the motorcycle. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7. It is a top view of an exhaust pipe. It is an exploded view of an exhaust pipe. It is a principal part perspective view of the motorcycle provided with the exhaust pipe which concerns on 2nd Example. It is a top view of the exhaust pipe which concerns on 2nd Example. It is a principal part perspective view of the motorcycle provided with the exhaust pipe which concerns on 3rd Example. It is a top view of the exhaust pipe which concerns on 2nd Example. It is sectional drawing of an intake device. It is 17 arrow line view of FIG.

  Hereinafter, embodiments of the present invention will be described in detail. In the drawings and examples, “up”, “down”, “front”, “rear”, “left”, and “right” respectively indicate directions viewed from the driver who rides the motorcycle. The drawings are viewed in the direction of the reference numerals.

First, Embodiment 1 of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a motorcycle 10 has an engine 12 suspended on a body frame 11, a front wheel 13 and a rear wheel 14 provided on the front and rear sides of the body frame 11, and between the front wheel 13 and the rear wheel 14. This is a saddle-ride type vehicle in which a seat 39 is provided and an occupant sits on the seat 39.

The vehicle body frame 11 includes a head pipe 21, a main frame 22 that extends downward from the head pipe 21, a down frame 23 that extends below the main frame 22 from the head pipe 21, and a main frame 22. A pivot frame 24 having a pivot portion 25 extending downward from the rear end and supporting the swing arm 17, a lower frame portion 33 extending from the lower end portion of the down frame 23 to the rear of the vehicle and connected to the pivot frame 24, and a main frame 22 includes a main cross member 34 that extends in the vehicle width direction at the rear of the vehicle 22, a seat frame 35 that extends from the main frame 22 toward the rear of the vehicle, and a subframe 36 that supports the seat frame 35. The seat frame 35 is a member that is attached to the rear portion of the main frame 22 and supports a seat 39 on which a driver sits.
The down frame 23 passes through the front of the engine 12 and extends below the engine 12. That is, the engine 12 is disposed behind the down frame 23.

A front fork 16 that supports the front wheel 13 is attached to the head pipe 21 of the body frame 11, and the front end 18 of the swing arm 17 is swingably supported on the pivot frame 24 of the body frame 11. The wheel 14 is rotatably supported.
In this embodiment, the front end of the swing arm is supported by the vehicle body frame, but may be supported by the engine.

  A lower end 28 of the rear cushion 27 is supported on the swing arm 17 via a link 26, and an upper end 29 of the rear cushion 27 is supported on the vehicle body frame 11. A steering handle 31 is attached to the front fork 16.

  A radiator unit 41 is provided on the down frame 23. The engine 12 suspended on the vehicle body frame 11 includes a crankcase 41 and a cylinder portion 47 attached on the crankcase 41. An exhaust pipe 51 extends from the front surface 48 of the cylinder portion, a connecting tube 52 is connected to the rear surface 49 of the cylinder portion, and an air cleaner 53 is connected to the connecting tube 52 behind the connecting tube 52 in the vehicle.

  The exhaust pipe 51 extends rearward from the cylinder portion 47 and extends rearward of the vehicle. A silencer 55 is connected to the rear end of the exhaust pipe 51. The silencer 55 is attached to the vehicle body frame 11 behind the engine 12. A fuel tank 61 is disposed above the cylinder portion 47. The fuel tank 61 is attached to the main frame 22.

  A chain 63 that transmits the driving force of the engine 12 is wound between the engine 12 and the rear wheel 14, and a chain guide 64 that suppresses the swing of the chain 63 in the vertical and horizontal directions is attached to the swing arm 17. A footrest 65 on which a driver puts his / her foot is attached to the lower portion of the pivot frame 24 so as to extend outward in the vehicle width direction.

Next, the arrangement structure of the exhaust pipe will be described.
As shown in FIG. 2, the exhaust pipe 51 extends from the cylinder portion 47 of the engine 12 to the front of the vehicle, bypasses the front of the down frame 23, extends to the left in the vehicle width direction of the engine 12, and From the left side in the vehicle width direction to the right side in the vehicle width direction behind the engine 12, and then connected to the silencer 55.

  The exhaust pipe 51 is formed by combining a plurality of divided small exhaust pipes, and hooks 71 for connecting these small exhaust pipes are provided in each small exhaust pipe, and between the adjacent exhaust pipe hooks 71a and 71b. By spanning the spring 72, the small exhaust pipes are held in a connected state.

Next, it will be described that the exhaust pipe is composed of a plurality of small exhaust pipes.
As shown in FIG. 3, the exhaust pipe 51 is connected to the front exhaust pipe 73 that extends from the cylinder portion (FIG. 2, reference numeral 47) of the engine and extends to the rear of the rear vehicle and the rear end of the front exhaust pipe 73. The exhaust pipe 74 includes a rear exhaust pipe 75 extending from the middle exhaust pipe 74 to the rear of the vehicle and connected to the silencer 55.

  At the position near the rear end of the front exhaust pipe 73, two hooks 71a and 71a to which springs 72 and 72 are hooked are fixed to the outer periphery 83, and a stopper ring 77a is fixed to a rear position of these hooks 71a and 71a. Is done. In addition, two hooks 71 b and 71 b that hang springs 72 and 72 are fixed to the front end of the middle exhaust pipe 74.

  In addition, two hooks 71d and 71d that hang springs 72 and 72 are fixed to the outer periphery 84 at a position near the rear end of the middle exhaust pipe 74, and a stopper ring 77b is fixed to the rear of the hooks 71d and 71d. . In addition, two hooks 71e and 71e for engaging the springs 72 and 72 are fixed to the front end of the rear exhaust pipe 75.

Next, the fitting structure of the exhaust pipe will be described.
As shown in FIG. 4, a stopper ring 77 is fixed to the outer periphery 83 near the rear end of the front exhaust pipe 73. The inner peripheral surface 84b of the middle exhaust pipe 74 is joined to the outer peripheral surface 73a of the front exhaust pipe 73 so as to fit into the side surface of the stopper ring 77a.
A protective protector 79 is disposed on the outer periphery of the intermediate exhaust pipe 74 with a gap from the outer peripheral surface of the intermediate exhaust pipe 74.

Next, it will be described that the exhaust pipe extends to the cam chain chamber side of the engine.
As shown in FIG. 5, when the main cross section is expanded, the engine 12 includes a crankcase 91 in which a crankshaft 91, a gear train 92 for shifting, a clutch device 93, an ACG unit 94, and the like are housed. A cylinder block 98 formed with a piston sliding portion 97 extending upward from 95 and sliding with a piston 96; and a cylinder head 103 mounted on the cylinder block 98 and having a cam shaft 101 and an intake / exhaust valve 102; A head cover 104 placed on the cylinder head 103 is included as a main structure. The cylinder block 98, the cylinder head 103, and the head cover 104 are collectively referred to as a cylinder portion 47.

A crankcase 107 in which the crankshaft 91 is disposed in the crankcase 95 and a gear chamber 108 in which the transmission gear train 92 is incorporated are provided.
The clutch device 93 is disposed on the right side of the vehicle width, and the side of the crankcase 95 in which the clutch device 93 is housed is covered with the clutch cover 111.

A cam chain chamber 112 is provided on the left side in the vehicle width direction across the crankcase 95, the cylinder block 98, the cylinder head 103, and the head cover 104. A crank sprocket 113 attached to the left end of the crankshaft 91, a cam sprocket 114 attached to the left end of the camshaft 101, a crank sprocket 113 and a cam sprocket 114, in a cam chain chamber 112 provided in the cylinder portion 47 of the engine 12. The cam chain 115 wound around is accommodated.
Outside the cam chain chamber 112 in the vehicle width direction, the exhaust pipe 51 extends rearward of the vehicle on the other side (left side) of the engine 12 in the vehicle width direction.

  Since the heat dissipated from the exhaust pipe 51 is insulated by the cam chain chamber 112 of the engine 12, the heat of the exhaust pipe 51 becomes difficult to be transmitted to the piston sliding portion 97 of the cylinder portion 47, and the heat to the piston sliding portion 97. The influence can be reduced. Therefore, the performance of the engine 12 can be improved.

  Further, since the heat influence on the piston sliding portion 97 is reduced, the exhaust pipe 51 can be disposed closer to the engine 12. By disposing the exhaust pipe 51 close to the engine 12, a space for moving the occupant legs can be widened, the degree of freedom of movement of the legs can be increased, and the operability of the vehicle can be improved.

Next, the point that the front exhaust pipe extends around the front of the down frame will be described.
As shown in FIG. 6, the front exhaust pipe 73 of the exhaust pipe 51 extends obliquely forward to the right from the cylinder portion 47, and then extends to the left side of the vehicle width so as to bypass the front of the down frame 23. The cylinder portion 47 extends rearward along the left side of the cylinder portion 47.
The radiator unit 41 is divided and arranged on the left and right sides of the down frame 23 in the vehicle width direction.

Next, the structure of an exhaust system including an exhaust pipe and a silencer when viewed from the right side of the vehicle will be described.
As shown in FIG. 7, a tail member 131 that supports the seat 39 is provided at the rear of the vehicle, and the tail member 131 is supported by the subframe 36 and the seat frame 35.
The tail end of the silencer 55 is attached to the tail member 131.

  Further, a silencer bracket 123 extending downward is attached to the front end of the sub-frame 36 in the vehicle front-rear direction, and the front end of the silencer 55 is fastened to the silencer bracket 123. That is, the silencer 55 is attached to the vehicle body frame 11 at the vehicle rear position of the engine 12.

  A clutch cover 111 is provided on one side (right side) of the engine 12 in the vehicle width direction so as to cover the clutch device (reference numeral 93 in FIG. 5). A kick starter arm 127 is attached to the upper side of the clutch cover 111 obliquely behind the vehicle, and a kick starter cover 127 is disposed to cover the kick starter gear (reference numeral 126 in FIG. 5).

  Referring also to FIG. 2, the exhaust pipe 51 is inclined upward from the other side (left side) in the vehicle width direction toward the one side (right side) in the vehicle width direction and obliquely upward so as to avoid the kick starter cover 127. It has the inclination part 132, and has the detouring part 133 which detours behind the clutch cover 111 located in the downstream of this upper inclination part 132, and upwards behind a vehicle.

  As the exhaust pipe 51 is inclined upward from the other side (left side) in the vehicle width direction toward one side (right side) in the vehicle width direction, the clutch device (FIG. 5, reference numeral 93) can be enlarged. By increasing the size of the clutch device 93, the durability of the clutch can be increased.

  An intake device 135 including an air cleaner 53 is provided behind the engine 12 in the vehicle. An exhaust pipe 51 extends between the engine 12 and the intake device 135. By providing a distance between the engine 12 and the intake device 135, the outer diameter of the exhaust pipe 51 can be increased.

The silencer mounting structure will be described with reference to FIGS.
As shown in FIG. 8, a rib portion 136 which is a convex portion is provided on the tail member 131 so as to protrude outwardly from the vehicle, and a rear upper portion 145 of the silencer 55 is applied to the rib portion 136, and the silencer 55 is attached by the fastening member 137. Fastened to the tail member 131.

As shown in FIG. 9, a stay 143 having a welding nut 142 is fixed to the outer peripheral portion 141 of the silencer. The stay 143 has a mounting seat 140 for the silencer 55 that projects outward from the vehicle, and a welding nut 142 is fixed to the mounting seat 140.
The silencer 55 was fastened to the silencer bracket 123 with the fastening member 137 by placing the front end 144 of the silencer against the mounting seat 140.

Next, the components of the exhaust pipe and the positional relationship between the exhaust pipe and the engine will be described.
As shown in FIG. 10, the exhaust pipe 51 includes a front exhaust pipe 73, a middle exhaust pipe 74, and a rear exhaust pipe 75 as viewed from above the vehicle.
The front exhaust pipe 73 includes a first bent pipe part 151 connected to the cylinder part (FIG. 2, reference numeral 47), a first straight pipe part 156 fixed to the left end of the first bent pipe part 151, and the first The first straight pipe part 156 includes a second bent pipe part 152 fixed to the left end of the first straight pipe part 156 and a second straight pipe part 157 fixed to the rear end of the second bent pipe part 152.

The middle exhaust pipe 74 is a third bent pipe portion 153 that is detachably connected to the rear end of the second straight pipe portion 157. The middle exhaust pipe 74 includes an upper inclined portion 132 and a detour portion 133 on the downstream side of the upper inclined portion 132.
The rear exhaust pipe 75 is a third straight pipe portion 158 that is detachably connected to the rear end of the third bent pipe portion 153 and also serves as an upstream portion of the silencer 55.

That is, the exhaust pipe 51 includes a first bent pipe portion 151 that extends from the front of the engine 12 to the front in the vehicle width direction, and extends from the first bent pipe portion 151 in the vehicle width direction to the down frame (see reference numeral 23 in FIG. 6). The first straight pipe part 156 and the second bent pipe part 152 that extend to the other side in the vehicle width direction of the engine 12 by detouring the front of the engine 12 and the rear end 152b of the second bent pipe part 152 are fixed to the rear side of the vehicle. A second straight pipe portion 157, a third bent pipe portion 153 extending from the other side (left side) in the vehicle width direction to the one side (right side) in the vehicle width direction behind the engine 12, and a rear side of the third bent pipe portion 153 The third straight pipe portion 158 is connected to the end 153b and also serves as the front end of the silencer 55.
Here, a portion 117 of the exhaust pipe 51 that crosses the front of the engine block 100 is included in the first bent pipe part 151, the first straight pipe part 156, and the second bent pipe part 152.

A portion 121 passing through the left side of the engine block 100 in the exhaust pipe 51 is included in the second bent pipe portion 152, the second straight pipe portion 157, and the third bent pipe portion 153.
A portion 118 crossing the rear of the engine block 100 is included in the third bent pipe portion 153.

Next, it will be described that the exhaust pipe has a divided structure.
As shown in FIG. 11, the upstream portion 73a of the front exhaust pipe 73 is detachably attached to the engine flange 162 attached to the exhaust port of the engine (FIG. 2, reference numeral 12) with a nut or bolt 161. Two hooks 71c and 71c are fixed to the outer peripheral portion of the front exhaust pipe 73 in the vicinity of the front end thereof, hook holes 163 and 163 are opened in the engine flange 162, and a cylindrical portion 164 that protrudes in a cylindrical shape on the engine flange 162. The front exhaust pipe 73 is detachably mounted on the engine flange 162 by fitting the upstream portion 73a of the front exhaust pipe 73 and passing the springs 72, 72 between the hooks 71c, 71c and the hook holes 163, 163, respectively. I was able to do that.

  Hooks 71a and 71a are provided on the outer periphery near the rear end of the front exhaust pipe, and when the middle exhaust pipe 74 is fitted to the front exhaust pipe 73 on the vehicle rear side of these hooks 71a and 71a, the middle exhaust pipe 74 is provided. A stopper ring 77a for restricting the front end position is fitted.

  Hooks 71b and 71b are provided on the outer periphery in the vicinity of the front end of the middle exhaust pipe 74. The middle exhaust pipe 74 is fitted into the front exhaust pipe 73, and the hooks 71a and 71a provided on the front exhaust pipe side and the middle exhaust pipe 74 side are provided. By passing springs 72, 72 between the provided hooks 71b, 71b, the front exhaust pipe 73 and the middle exhaust pipe 74 can be detachably connected. Further, by arranging the hooks 71a and 71b above and below the exhaust pipes 73 and 74, an increase in the vehicle width direction is prevented.

In FIG. 10, a portion 121 of the exhaust pipe 51 that extends in the front-rear direction of the vehicle to the left side of the engine 12, that is, the left side of the cylinder portion 47, has a split structure that can be separated in the front-rear direction.
Specifically, a portion 121 extending in the vehicle front-rear direction to the side of the cylinder portion 47 and a portion inclined upward from the other side (left side) in the vehicle width direction to one side (right side) in the vehicle width direction, that is, The third bent pipe portion 153 including the upper inclined portion 132 is a divided structure that can be separated front and rear.
By using the exhaust pipe 51 having a divided structure, the exhaust pipe 51 can be partially replaced. Therefore, maintainability of the exhaust pipe 51 can be improved.

  The hooks 71d and 71e that connect the exhaust pipes 74 and 75 are disposed above and below the exhaust pipes 74 and 75. Therefore, the hooks 71d and 71e are attached and detached in a limited space between the pivot frame 24R of the vehicle body frame and the rear cushion 27. The exhaust pipes 74 and 75 having a possible structure can be arranged in a compact manner.

The operation of the motorcycle described above will be described next.
In FIG. 6, the exhaust pipe 51 extends from the front of the engine 12 to one side (right side) in the vehicle width direction, bypasses the front of the down frame 23, and extends to the other side (left side) of the engine 12 in the vehicle width direction. .

Since the exhaust pipe 51 extending from the engine 12 to the silencer 55 bypasses the front of the down frame 23, the radius of curvature of the exhaust pipe 51 is increased. As the radius of curvature of the exhaust pipe 51 increases, the exhaust resistance of the exhaust gas decreases.
Here, the radius of curvature is a value representing the degree of bending of the curve, and the degree of bending becomes gradual as the radius of curvature increases. The reciprocal of the radius of curvature is indicated by the curvature.

  In FIG. 10, the exhaust pipe 51 extends to the vehicle rear side on the left side in the vehicle width direction of the engine 12, and extends from the vehicle width direction other side (left side) to the vehicle width direction one side (right side) behind the engine 12. The silencer 55 is connected to the side of the body frame 11.

  If the exhaust pipe is lengthened without changing the position of the silencer 55, the amount of protrusion of the exhaust pipe toward the front of the vehicle and the amount of protrusion in the vehicle width direction are likely to increase. If it does so, it will become difficult to ensure an appropriate clearance between an exhaust pipe and a front wheel, and to ensure an appropriate clearance between an exhaust pipe and a road surface. By moving the silencer, the exhaust pipe can be lengthened, but the moment of inertia of the vehicle tends to increase, and the controllability of the vehicle may decrease. Further, when the exhaust pipe is disposed close to the cylinder portion of the engine, the cylinder portion is difficult to be cooled and the engine performance is likely to be lowered.

In this regard, in the present invention, the exhaust pipe 51 is traversed in the vehicle width direction in front of and behind the engine 12.
Referring also to FIG. 6, the vehicle width direction length W of the exhaust pipe 51 is set within the range of the vehicle block direction length WE of the engine block 100.
For this reason, it is possible to lengthen the exhaust pipe 51 while arranging the exhaust pipe 51 around the engine 12 in a compact manner. If the exhaust pipe 51 is lengthened, engine performance can be enhanced particularly at low and medium speeds.
The exhaust resistance of the exhaust gas is reduced and the exhaust pipe 51 is lengthened. As a result, the performance of the engine 12 can be improved.

  A rear cushion 27 is disposed behind the engine 12 and extends between the engine 12 and the rear cushion 27 from the other side (left side) 165 of the exhaust pipe 51 to the one side (right side) 166 in the vehicle width direction. A portion, i.e., a portion 118 across the back of the engine block 100 is placed. Since a sufficient distance is ensured between the engine 12 and the rear cushion 27, the outer diameter of the exhaust pipe 51 can be increased accordingly. For this reason, the engine performance can be further enhanced without increasing the size of the vehicle body frame 11.

Next, a motorcycle including an exhaust pipe according to a second embodiment will be described.
As shown in FIG. 12, an exhaust pipe 51 extends from the right side to the left side in the vehicle width direction so as to bypass the front of the down frame 23 from the engine 12, and a bypass pipe 167 is attached to the exhaust pipe 51.

As shown in FIG. 13, a bypass pipe 167 that forms a bypass passage 168 is passed between the first bent pipe section 151 and the third bent pipe section 153.
A significant difference from the first embodiment is that a bypass pipe 168 that can change the exhaust characteristics by connecting the upstream side and the downstream side of the exhaust pipe 51 is provided on one side (right side) of the engine 12 in the vehicle width direction. Other than that, there is no significant difference and the explanation is omitted.

  In addition to the main exhaust passage (exhaust pipe 51) having a long pipe length, the first bent pipe portion 151 constituting the upstream side of the main exhaust passage and the third bent pipe portion 153 constituting the downstream side are shortly connected. Since the bypass pipe 168 is provided, the engine performance can be further enhanced.

Next, a motorcycle including an exhaust pipe according to a third embodiment will be described.
As shown in FIG. 13, an exhaust pipe 51 extends from the right side to the left side in the vehicle width direction so as to bypass the front of the down frame 23 from the engine 12, and a bypass pipe 167 is attached to the exhaust pipe 51. An expansion tube 169 constituting an expansion chamber (FIG. 15, reference numeral 170) is interposed in 167.

  The major difference from the second embodiment is that the bypass pipe 168 is provided with an expansion chamber 170 having an inner diameter larger than the inner diameter of the bypass pipe 168, and there is no significant difference, and the description is omitted.

As shown in FIG. 14, a bypass pipe 167 that forms a bypass passage 168 is passed between the first bent pipe section 151 and the third bent pipe section 153, and an expansion pipe 169 in which an expansion chamber 170 is provided in the bypass pipe 167. Is interposed.
An expansion chamber 170 is provided in the bypass pipe 168. Engine performance can be enhanced by the expansion chamber 170.

Next, electrical components built in the intake device of the saddle-ride type vehicle according to the present invention will be described.
As shown in FIG. 16, an air cleaner 53 as a component of the intake device 135 includes a front half 173 having a seat portion 171 to which a cleaner element 175 is attached that spreads in a bowl shape, and a cleaner element that is detachably provided on the front half 173. The main element is 175 and a rear half 174 that removably covers the periphery of the cleaner element 175.

  As shown in FIG. 17, an element mounting portion 181 for positioning and fixing the cleaner element 175 at a predetermined position is provided on the seat portion 171, and a capacitor 177 that is an electrical component is detachably supported below the element mounting portion 181. A rib portion 178 is projected. A capacitor 177 is attached to the rib portion 178.

In FIG. 16, a cleaner element 175 is provided in the air cleaner 53, and the cleaner element 175 is divided into a clean side 183 and a dirty side 184. Upper and lower openings 186 and 187 for taking outside air upward and downward are formed in the dirty side 184 between the front half 173 and the rear half 174. Also, a clean air outlet 188 is opened in the front half 173 forming the clean side 183.

  The capacitor 177 is disposed on the dirty side 184 inside the air cleaner 53. By disposing the capacitor 177 inside the air cleaner 53, it is possible to reduce the space for arranging the electrical components in the saddle-ride type vehicle.

  Since the rib portion 178 for attaching the capacitor 177 is provided on the seat portion 171 and the lower opening 187 is positioned below the rib portion 178, foreign matters such as mud entering the lower opening 187 together with the air are removed from the rib portion 178. It hits. Therefore, it is possible to make it difficult for foreign matters such as mud to adhere to the inside of the air cleaner 53.

  Although the present invention is applied to a motorcycle in the embodiment, it can also be applied to a saddle-ride type tricycle and can be applied to a general saddle-ride type vehicle.

  The present invention is suitable for motorcycles.

  DESCRIPTION OF SYMBOLS 10 ... Saddle-ride type vehicle (motorcycle), 11 ... Body frame, 12 ... Engine, 21 ... Head pipe, 23 ... Down frame, 27 ... Rear cushion, 47 ... Cylinder part of engine, 51 ... Exhaust pipe, 55 ... Silence , 93 ... Clutch device, 111 ... Clutch cover, 112 ... Cam chain chamber, 118 ... Part of the exhaust pipe extending from the other side in the vehicle width direction to one side in the vehicle width direction, 135 ... Intake device, 168 ... Bypass passage, 170: Expansion chamber.

Claims (7)

A vehicle body frame (11) having a head pipe (21) and a down frame (23) extending downward from the head pipe (21), and is suspended on the vehicle body frame (11) and arranged behind the down frame (23). An engine (12), an exhaust pipe (51) extending from the engine (12), and connected to the tip of the exhaust pipe (51) to the vehicle body frame (11) behind the engine (12). In a saddle-ride type vehicle equipped with a silencer (55) to be attached,
The exhaust pipe (51) extends from the front of the engine (12) to one front in the vehicle width direction, bypasses the front of the down frame (23), and extends to the other side in the vehicle width direction of the engine (12). The muffler (1) extends rearward of the vehicle and extends from the other side in the vehicle width direction to the one side in the vehicle width direction behind the engine (12) and is disposed on the side of the vehicle body frame (11). 55). A saddle-ride type vehicle characterized by being connected to 55).   A rear cushion (27) is arranged at the center in the vehicle width direction behind the engine (12), and the exhaust pipe (51) is disposed between the engine (12) and the rear cushion (27). The saddle-ride type vehicle according to claim 1, wherein a portion (118) extending from the other side in the vehicle width direction to one side in the vehicle width direction is placed.   A portion (121) of the exhaust pipe (51) extending rearward of the vehicle on the other side in the vehicle width direction of the engine (12) is a cam chain provided in a cylinder portion (47) of the engine (12). The saddle-ride type vehicle according to claim 1, wherein the saddle-ride type vehicle is disposed outside the chamber (112) in the vehicle width direction. A clutch cover (111) for covering the clutch device (93) is provided on one side in the vehicle width direction of the engine (12), and an intake device (135) is provided on the rear side of the engine (12).
The exhaust pipe (51) is disposed so as to be inclined upward from the other side in the vehicle width direction toward one side in the vehicle width direction and to be detoured behind and above the clutch cover (111). The saddle riding type vehicle according to claim 2,   The part (121) of the exhaust pipe (51) extending in the vehicle front-rear direction to the side of the cylinder part (47) has a divided structure that can be separated in the front-rear direction. A saddle-ride type vehicle.   A bypass passage (168) capable of changing exhaust characteristics by connecting the upstream side and the downstream side of the exhaust pipe (51) is provided on one side in the vehicle width direction of the engine (12). The saddle-ride type vehicle according to claim 1.   The saddle riding type vehicle according to claim 6, wherein the bypass passage (168) is provided with an expansion chamber (170) having an inner diameter larger than an inner diameter of the bypass passage (168).

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