JP6457465B2 - Exhaust device for saddle riding type vehicle - Google Patents

Description

  The present invention relates to an exhaust device for a saddle riding type vehicle including an exhaust pipe and a silencer.

As an exhaust device for a conventional saddle-type vehicle, an exhaust device including a silencer and an exhaust pipe having an upstream side connected to the internal combustion engine and a downstream side connected to the silencer is shown, for example, in Patent Document 1 below. Known to be.
The silencer of the exhaust device in the following Patent Document 1 includes an outer case that constitutes an outer shell, and a separator that divides the interior into a plurality of expansion chambers, and in the mounted state of the exhaust device in a saddle-ride type vehicle, A drain hole 12 is provided in the expansion chamber provided at the lowest position.

However, in the one shown in Patent Document 1 below, since the downstream open end of the exhaust pipe and the drain hole are arranged in the same expansion chamber, the sound emitted from the downstream open end of the exhaust pipe is not generated. It becomes easy to leak directly from the drain hole.
Therefore, in order to suppress sound leakage from the drain hole to the outside, they must be provided in a positional relationship in which they are separated from each other. For example, if a silencer is provided in a position where they are separated in the same expansion chamber, Is easy to enlarge.
Further, when the downstream open end of the exhaust pipe is released in an expansion chamber different from the expansion chamber provided with the drain hole, the exhaust pipe length set by the output of the internal combustion engine is restricted, and a desired It becomes difficult to obtain output characteristics.
In addition, when the drain hole is provided in another expansion chamber, the drain hole cannot be provided at the low position of the silencer, and it becomes difficult to ensure a sufficient function of the drain hole.

JP 2013-160084 A (FIGS. 1, 2, 6)

  The present invention has been made in view of the above-described prior art. The downstream open end of the exhaust pipe is disposed in the first expansion chamber provided at the lowest position of the silencer, and the first expansion chamber and the drain are arranged. It is an object of the present invention to provide an exhaust device for a straddle-type vehicle capable of reducing sound leakage from the drain hole while ensuring the function of the drain hole even when the holes are communicated.

In order to solve the above problems, an invention according to claim 1 is an exhaust system comprising a silencer and an exhaust pipe having an upstream side connected to the internal combustion engine and a downstream side connected to the silencer. The silencer has an outer case that constitutes an outer shell portion, and a separator that divides the inside into a plurality of expansion chambers, and the plurality of expansions when the exhaust device is mounted on a saddle-ride type vehicle. An open end on the downstream side of the exhaust pipe is disposed in a first expansion chamber provided at the lowest position in the chamber, and a drain hole is provided for communicating the first expansion chamber and the outside of the silencer. In the exhaust system of a riding vehicle,
The silencer includes a cylindrical portion having a double cylindrical structure in which an inner case is provided inside the outer case, and a shielding portion that covers the drain hole is provided in the first expansion chamber ,
A water passage recess formed by separating the outer peripheral portion of the separator from the inner peripheral surface of the cylindrical portion is provided vertically below the center of the muffler in the vehicle width direction, and the drain hole is formed in the water flow recess. An exhaust device for a saddle-ride type vehicle, which is formed to be spaced apart inward in the vehicle width direction .
According to a second aspect of the present invention, in the exhaust system for a saddle-ride type vehicle according to the first aspect,
The silencer is suspended from a power unit via a support bracket attached to the tubular part, and when the vertical virtual plane passing through the center of the silencer in the vehicle width direction is used as a reference, The support bracket is attached on the vertical virtual plane, and the drain hole is disposed offset with respect to the vertical virtual plane in the vehicle width direction.
According to a third aspect of the present invention, in the exhaust system for a saddle-ride type vehicle according to the first aspect,
The muffler is formed so that the longitudinal direction of the vehicle is the longitudinal direction of the vehicle, and the outer case includes the cylindrical portion, a front lid portion connected to a front end of the cylindrical portion, and a rear end of the cylindrical portion The silencer is hung on a power unit via a support bracket attached to the front lid, and a vertical virtual plane passing through the center of the silencer in the vehicle width direction is provided. When used as a reference, the lower portion of the front lid and the support bracket are attached on the vertical virtual plane, and the drain hole is disposed offset in the vehicle width direction with respect to the vertical virtual plane. It is characterized by that.

According to a fourth aspect of the present invention, in the exhaust system for a saddle-ride type vehicle according to any one of the first to third aspects, the outer shell portion includes at least the first expansion chamber. The inner case is provided inside the outer case and forms a space portion with the outer case, and a communication portion is formed in the inner case to communicate the first expansion chamber and the space portion. The drain hole is formed in the outer case, and is covered with the inner case with the inner case facing the space portion as the shielding portion. is there.

According to a fifth aspect of the present invention, in the exhaust system for a saddle-ride type vehicle according to the fourth aspect , the silencer is formed so that the longitudinal direction of the vehicle is the longitudinal direction of the vehicle, and the drain hole is formed in the communication portion. On the other hand, it is formed to be separated in the vehicle front-rear direction.

According to a sixth aspect of the present invention, in the exhaust device for a saddle-ride type vehicle according to the fifth aspect , the communication portion includes a first communication portion provided at a position lower than the drain hole, and the drain hole. The second communication portion is provided at a higher position.

According to a seventh aspect of the present invention, in the exhaust device for a saddle riding type vehicle according to the fourth aspect , the drain hole is formed to be separated from the communication portion in the vehicle width direction. To do.

According to an eighth aspect of the present invention, in the exhaust device for a saddle-ride type vehicle according to the seventh aspect , the drain hole is formed to be spaced apart inward in the vehicle width direction with respect to the communication portion. And

According to a ninth aspect of the present invention, in the exhaust system for a saddle-ride type vehicle according to the fourth aspect , the communication part is a lower part of the silencer and a vertical direction passing through the center of the silencer in the vehicle width direction. It is formed on a virtual plane.

The invention according to claim 10, in the exhaust system of a straddle-type vehicle according to claim 1, when relative to the vertical imaginary plane passing through the center in the vehicle width direction of the muffler, the downstream of the exhaust pipe The side open end is disposed on one side in the vehicle width direction, and the drain hole is disposed on the other side in the vehicle width direction.

The invention according to claim 11, in the exhaust system of a straddle-type vehicle according to claim 1, wherein the exhaust pipe is extending the first expansion chamber to the rear is connected from the front to the silencer A first pipe part, a second pipe part having one end connected to the rear end of the first pipe part and a direction change toward the front of the vehicle, and a second pipe part connected to the other end of the second pipe part and the downstream A third pipe portion extending forward so that a side open end is located in the first expansion chamber, and in the silencer, the third pipe portion is disposed on one side in the vehicle width direction, The first pipe part and the drain hole are arranged on the other side in the vehicle width direction.

The invention according to claim 12, in the exhaust system of a straddle-type vehicle according to claim 1, wherein the muffler is formed to the front-rear direction of the vehicle and the longitudinal direction, wherein the outer casing includes a tubular portion The inner side having a front lid part connected to the front end of the cylindrical part and a rear lid part connected to the rear end of the cylindrical part and formed in a cylindrical shape inside the cylindrical part A case is attached.

According to a thirteenth aspect of the present invention, in the exhaust system for a saddle riding type vehicle according to any one of the first to third aspects, the outer case (182) and the inner case (192) are mutually connected. It is characterized by being provided with different thickness and in contact with each other

According to the exhaust system for a saddle-ride type vehicle according to the first aspect of the present invention, the water or the like accumulated in the first expansion chamber provided at the lowest position when mounted on the saddle-ride type vehicle is the first expansion chamber. And the drain hole communicating with the outside of the silencer can be sufficiently discharged.
At this time, since the drain hole is covered with the shielding portion disposed in the first expansion chamber, the downstream open end of the exhaust pipe is disposed in the first expansion chamber, and the first expansion chamber and the drain hole are Even if they are communicated, it is possible to prevent the exhaust sound from being directed directly to the drain hole, and to reduce sound leakage from the drain hole while ensuring the function of the drain hole.
In addition, by forming a drain hole at a position spaced inward in the vehicle width direction with respect to the water passage recess,
Even if sound leaks from the drain hole, the sound that leaks from the drain hole is radiated inward in the vehicle width direction, so the leaked sound is outside the vehicle width, that is, a third party located outside the vehicle. Can be made difficult to hear, and the influence of sound leakage can be reduced. Since the water passage recess is provided vertically below the center in the vehicle width direction, water or the like generated in the silencer can easily pass through the water passage recess and is efficiently discharged from the drain hole.
The motorcycle is provided with a side stand opposite to the exhaust device, and when the side stand is used, the motorcycle is inclined to the side stand side. Since the drain hole is formed so as to be spaced apart inward in the vehicle width direction with respect to the water passage recess, the drain hole is oriented so as to approach the vertical direction when tilted, so that the discharge performance is preferably exhibited.
According to the exhaust system for a saddle-ride type vehicle according to the second aspect of the present invention, in addition to the effect of the first aspect, when the support bracket is attached to the lower portion of the cylindrical portion, the cylindrical portion and the support bracket By disposing the drain hole with an offset in the vehicle width direction with respect to the mounting position, the drain hole can be provided without interfering with the mounting position of the cylindrical portion and the support bracket.
According to the exhaust system for a saddle-ride type vehicle according to the third aspect of the present invention, in addition to the effect of the first aspect of the invention, even when the support bracket is attached to the lower portion of the front lid portion, By disposing the drain hole offset in the vehicle width direction with respect to the attachment position with the support bracket, the drain hole can be provided without interfering with the attachment position between the front lid portion and the support bracket.

According to the exhaust system for a saddle-ride type vehicle according to a fourth aspect of the invention, in addition to the effect of the invention according to any one of the first to third aspects , the exhaust device is provided via a communication portion formed in the inner case. Since the first expansion chamber communicates with the drain hole, water or the like accumulated in the first expansion chamber provided at the lowest position when the exhaust device is mounted on the saddle riding type vehicle passes through the communication portion to the outside. It can fully discharge from the drain hole formed in the case.
At this time, since the drain hole is covered with the inner case with the inner case facing the space portion as a shielding portion, the downstream open end of the exhaust pipe is disposed in the first expansion chamber, and the first expansion chamber Even if the drain hole is in communication, the exhaust sound is prevented from being directed directly to the drain hole, the exhaust sound is attenuated, and the sound leakage from the drain hole is reduced while ensuring the function of the drain hole. be able to.
Furthermore, since the downstream open end of the exhaust pipe is disposed in the first expansion chamber, the outer shell portion of the portion including the first expansion chamber vibrates under the influence of the pressure wave discharged from the downstream open end. Although it is easy, at least in the range including the first expansion chamber, the outer shell part is provided with a cylindrical part of a double cylinder structure in which the inner case is provided inside the outer case, so that the rigidity of the same part is increased. And the influence of sound caused by vibration can be reduced.

According to the invention of claim 5 , in addition to the effect of the invention of claim 4 , by forming the drain hole at a position separated from the communication part in the vehicle front-rear direction, the distance between the communication part and the drain hole is increased. Thus, sound leakage can be further reduced.

According to the invention of claim 6 , in addition to the effect of the invention of claim 5 , the first communicating portion at the lower position and the second communicating portion at the higher position are formed at positions separated from each other in the front-rear direction with respect to the drain hole. Therefore, it is possible to reduce the leakage of sound while facilitating the discharge of water accumulated at a position lower than the drain hole, and for water transmitted from a position higher than the drain hole to a lower position. It can be discharged efficiently.

According to the invention of claim 7 , in addition to the effect of the invention of claim 4 , by forming the drain hole at a position separated from the communication part in the vehicle width direction, the interval between the communication part and the drain hole is increased. Thus, sound leakage can be further reduced.

According to the invention of claim 8 , in addition to the effect of the invention of claim 7 , when the drain hole is formed at a position spaced inward in the vehicle width direction with respect to the communicating portion, sound leaks from the drain hole temporarily. However, since the sound leaking from the drain hole is radiated inward in the vehicle width direction, the leaked sound can be made difficult to be heard by a third party located outside in the vehicle width direction, that is, outside the vehicle. The effect of sound leakage can be reduced.

According to the ninth aspect of the invention, in addition to the effect of the fourth aspect of the invention, the communication portion is provided at the lowest end portion in the direction of gravity, so that water or the like generated in the silencer passes through the communication portion. It becomes easy and is efficiently discharged from the drain hole.

According to the invention of claim 10 , in addition to the effect of the invention of claim 1 , the downstream open end of the exhaust pipe and the drain hole are separated from each other in the vehicle width direction, and the distance between the downstream open end and the drain hole is set. In addition to reducing sound leakage from the drain hole, it is possible to reduce the size of the silencer in the front-rear direction.

According to the invention of claim 11, the effect of the invention according to claim 1, the exhaust pipe, a first arrangement of claim 11, the second, even when having a third tubular portion, the muffler in In this case, the downstream open end of the exhaust pipe and the drain hole can be separated from each other in the vehicle width direction to increase the distance between the downstream open end and the drain hole, and sound leakage from the drain hole can be reduced. Interference between the tube portion and the third tube portion can be prevented.

According to the invention of claim 12 , in addition to the effect of the invention of claim 1 , the drain hole is covered in a wide range by the cylindrical inner case facing the space so as to be covered by the space in a wide range. Sound leakage can be reduced more effectively.

According to the invention of the exhaust system for a saddle-ride type vehicle according to the invention of claim 13, in addition to the effect of the invention of any one of claims 1 to 3 ,
By making the cylindrical portion a double cylinder structure in which an outer case and an inner case having different thicknesses and different vibration characteristics are in close contact with each other, the sound attenuation effect is further enhanced.

FIG. 3 is a right side view of a main part of the scooter type motorcycle equipped with the exhaust device for the saddle riding type vehicle according to the first embodiment of the present invention, with the front wheel side omitted. Fig. 2 is a rear cross-sectional view of the rear lower part of the motorcycle as viewed in the direction of arrows II-II in Fig. 1. FIG. 2 is a left side view of the exhaust device according to the first embodiment, which is shown by extracting a part of the silencer and the exhaust pipe as viewed from the left side, contrary to FIG. 1. FIG. 4 is a top view of the exhaust device according to the first embodiment as viewed in the direction of arrows IV-IV in FIG. 3, and the outer shell portion is shown in a horizontal cross section excluding a part and an upper half (front side in the figure), and an exhaust pipe and the like The members that hold the pipes, such as the pipes and separators, are shown as they are. It is sectional drawing of the front part of a silencer by the VV arrow line in FIG. 3, FIG. FIG. 5 is a cross-sectional view of the exhaust pipe holder and the outer shell portion taken along the line VI-VI ′ in FIGS. 3 and 4. FIG. 5 is a rear view of the separator as viewed in the direction of arrows VII-VII in FIGS. 3 and 4. FIG. 5 is a bottom view of the inner case as viewed in the direction of arrows VIII-VIII in FIG. 3. FIG. 4 is a left side view of the exhaust device according to the second embodiment in which a silencer and a part of the exhaust pipe are taken out from the left side as shown in FIG. 3. FIG. 10 is a top view of the exhaust device of Embodiment 2 as viewed in the direction of arrows XX in FIG. 9, and the outer shell part is shown in a horizontal cross section excluding a part and excluding the upper half (the front side in the figure); The members that hold the pipes, such as the pipes and separators, are shown as they are, except for some parts. It is sectional drawing of the front part of a silencer by XI-XI arrow line in FIG. 9, FIG. It is sectional drawing of an exhaust pipe holder and an outer shell part by the XII-XII arrow view in FIG. 9, FIG. FIG. 11 is a rear view of the separator as viewed in the direction of arrows XIII-XIII in FIGS. 9 and 10.

Hereinafter, an exhaust device for a saddle-ride type vehicle according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 8.
In the description and claims of the present specification, the front, rear, left, right, top and bottom directions refer to a vehicle in a state where the exhaust device of the saddle riding type vehicle according to this embodiment is attached to a saddle riding type vehicle such as a motorcycle. Follow the direction. In the figure, arrow FR indicates the front of the vehicle, LH indicates the left side of the vehicle, RH indicates the right side of the vehicle, and UP indicates the upper side of the vehicle.
The above also applies to the exhaust device for a saddle-ride type vehicle according to a second embodiment described later with reference to FIGS. 9 to 13.

As a straddle-type vehicle according to Embodiment 1 of the present invention, FIG. 1 shows a right side surface of a main part of a scooter type motorcycle 1 in which a front wheel side is not shown. FIG. 2 is a rear cross-sectional view of the rear lower portion of the motorcycle 1 as viewed in the direction of arrows II-II in FIG.
The motorcycle 1 of the present embodiment includes a swing type power unit (hereinafter simply referred to as a swing type power unit) in which an internal combustion engine 2 and a power transmission device 3 to a rear wheel 6 are integrated and attached to a body frame 4 so as to be swingable up and down. 5 (hereinafter referred to as “power unit”) is provided below the passenger seat 10, and the internal combustion engine 2 is a single-cylinder four-stroke cycle internal combustion engine. The power unit 5 is mounted on the motorcycle 1 with the crankshaft 21 of the power unit case 50 oriented in the vehicle width direction of the motorcycle 1.

  Although not shown in FIG. 1, a pair of left and right front forks that pivotally support the front wheels are pivotally supported by a head pipe positioned at the front end of the vehicle body frame 4 via a steering stem. A steering handle is attached to the upper portion of the steering stem.

The vehicle body frame 4 extends from the head pipe to the pair of left and right main frames 40A, 40A after the main frame is connected obliquely downward and rearward, and extends substantially horizontally rearward, as shown in FIG. A flange 41 is formed with improved ease of straddling with the sheet 10 as a low part.
On the flange 41, a step floor 11 is provided so as to be connected to the lower rear of a front cover (not shown).

The left and right main frames 40A and 40A are connected by a cross frame 42 at the rear of the step floor 11, and further extended diagonally upward as a pair of left and right rear main frames 40B and 40B, and then bent so as to reduce the gradient. Extend backwards.
A housing 12 such as a helmet and a fuel tank 13 are supported between the rear main frames 40B and 40B, and an occupant seat 10 is disposed above the housing 12 and the fuel tank 13.

The vehicle body frame 4 is covered with a body cover 14 mainly made of synthetic resin.
In FIG. 1, reference numeral 15 is a rear fender, 16 is a main stand, and 17 is a side stand. The main stand 16 is indicated by a solid line when not in use, such as during travel, and the side stand 17 is indicated by a two-dot chain line when in use.

The power unit 5 is formed by integrating the internal combustion engine 2 at the front portion and the power transmission device 3 extending to the left side of the rear portion, and includes a hanger portion 51 at the front lower portion of the power unit case 50.
A rear wheel 6 that is a driving wheel of the motorcycle 1 is pivotally supported adjacent to the right side at the rear end portion of the power transmission device 3 provided on the left side of the rear portion of the power unit case 50.
The power unit 5 is supported by the pivot plate 43 attached to the lower part of the cross frame 42 and the rear main frames 40B and 40B through the suspension link 18 in the hanger portion 51 so that the power unit 5 can swing up and down. Is supported by the rear main frames 40B and 40B through the rear cushion 19 so as to be close to and away from each other.

A cylinder block 22, a cylinder head 23, and a head cover 24 of the internal combustion engine 2 are fastened to the front side of the power unit case 50 so as to be inclined substantially horizontally and forwardly.
A throttle body 26 connected to an intake pipe 25 extending from an upper part of a cylinder head 23 of the internal combustion engine 2 and an air cleaner 27 connected to the throttle body 26 are disposed at the upper part of the power transmission device 3.

On the other hand, the exhaust pipe 70 extending from the lower part of the cylinder head 23 extends downward while being biased to the right, curves backward, and is connected to the silencer 80 to constitute the exhaust device 7.
The silencer 80 is suspended from the power unit case 50 via a support bracket 52 and is located on the right side of the rear wheel 6.
The silencer 80 is oriented obliquely upward from the front to the rear, and a muffler cover 53 is attached so as to cover the upper half of the silencer.

FIG. 3 is a left side view of the exhaust device 7 which shows a part of the silencer 80 and the exhaust pipe 70 taken out from the left side, as opposed to FIG.
The exhaust device 7 includes a silencer 80 and an exhaust pipe 70 whose upstream side is connected to the internal combustion engine 2 and whose downstream side is connected to the silencer 80, and the silencer 80 constitutes an outer shell portion 81. An outer case 82 and a separator 84 that divides the inside into a plurality of expansion chambers 83 are provided.

In FIG. 3, the outer shell 81 is shown in a vertical cross section excluding a part and the left half (the front side in the figure), and the members for holding the pipes such as the exhaust pipe 70 and the pipes such as the separator 84 are in the outer shape as they are. Indicated.
In the present embodiment, the number of separators 84 is one, and the front of the separator 84, the left side in the figure is the first expansion chamber 83A, the rear side of the separator 84, the right side in the figure is the second expansion chamber 83B.

  4 is a top view of the exhaust device 7 as viewed in the direction of arrows IV-IV in FIG. 3. The outer shell 81 is shown in a horizontal section excluding a part and the upper half (the front side in the figure). The members that hold the tubes such as the tube 70 and the tubes such as the separator 84 are shown as they are.

  The silencer 80 is formed so that the longitudinal direction of the vehicle is the longitudinal direction of the vehicle. The outer case 82 is connected to the central cylindrical portion 85 that constitutes the majority of the outer case 82 and the front end of the cylindrical portion 85, and the exhaust pipe 70 It has a front lid part 86 having an insertion part, and a rear lid part 87 connected to the rear end of the cylindrical part 85 and to which an exhaust discharge pipe 71 is attached.

  The exhaust pipe 70 is connected to the silencer 80 from the front side at the front lid part 86 on the left side of the vertical virtual plane Vp passing through the center C in the vehicle width direction of the cylindrical part 85 and back in the first expansion chamber 83A. One end is connected to the rear end of the first pipe portion 70A, the second pipe portion 70B that changes direction toward the front of the vehicle, and the other end of the second pipe portion 70B. And a third pipe portion 70C which is disposed on the right side of the vertical virtual plane Vp and extends forward so that the downstream open end 72 is positioned in the first expansion chamber 83A.

Specifically, the first pipe portion 70A includes an expanded pipe portion 70Aa that accommodates an exhaust gas processing catalyst in the vicinity of the connection portion with the front lid portion 86. The first tube portion holding hole 88a of 88 is inserted and held, and further, the first tube portion holding hole 84a of the separator 84 is inserted and held, and the rear end is positioned in the second expansion chamber 83B.
One end of the second pipe portion 70B is connected to the rear end of the first pipe portion 70A, and the second pipe portion 70B makes a U-turn so as to turn from the left side to the right side of the vertical virtual plane Vp in the second expansion chamber 83B. Thus, the other end is connected to the upstream end of the third pipe portion 70C in the second expansion chamber 83B.
The third pipe part 70C is inserted and held through the third pipe part insertion hole 84c of the separator 84, extends into the first expansion chamber 83A, and is inserted and held through the third pipe part holding hole 88c of the exhaust pipe holder 88. At the same time, the downstream open end 72 is positioned in the first expansion chamber 83A.

As shown in FIG. 6, which is a cross-sectional view of the exhaust pipe holder 88 and the outer shell portion 81 as viewed in the direction of arrows VI-VI ′ in FIGS. 3 and 4, the exhaust pipe holder 88 includes the first pipe portion 70 </ b> A and the third pipe portion. The first expansion chamber 83A is not partitioned by a cross beam-like member for holding the pipe portion 70C and attaching to the inner case 92 described later.
The downstream side from the downstream open end 72 of the third pipe part 70C becomes an exhaust open part 73 in which the tube wall is formed in a porous plate shape, and the downstream end is closed, and the inside of the first expansion chamber 83A is closed. Release the exhaust pressure slowly.
4 and 6, reference numeral 92 f is a welding opening provided in the inner case 92 in order to weld the exhaust pipe holder 88 to the inner case 92.

Further, as shown in FIG. 7, which is a rear view of the separator 84 as viewed in the direction of arrows VII-VII in FIGS. 3 and 4, the separator 84 includes a first tube portion insertion hole 84a and a third tube portion insertion hole 84c. A communication pipe insertion hole 84d is provided slightly below, and a communication pipe 89 for connecting the first expansion chamber 83A and the second expansion chamber 83B is inserted and fixed.
An exhaust discharge pipe 71 is attached to the rear lid portion 87 so that the exhaust device 7 is mounted rearward on the motorcycle and is inclined rearward and slightly inclined downward.

Thus, the exhaust gas sent from the internal combustion engine 2 is treated with the exhaust gas treating catalyst in the expanded pipe portion 70Aa of the first pipe portion 70A of the exhaust pipe 70, and then passes through the first pipe portion 70A to be the first. The first expansion chamber 83A passes through the expansion chamber 83A, passes through the second pipe portion 70B, passes through the second expansion chamber 83B, and extends from the exhaust opening 73 on the downstream side of the downstream open end 72 of the third pipe portion 70C. Flows into.
The exhaust gas whose exhaust pressure has been released in the first expansion chamber 83A flows into the second expansion chamber 83B through the communication pipe 89, further releases the exhaust pressure, and is discharged to the outside from the exhaust discharge pipe 71.

Since the silencer 80 is oriented obliquely upward from the front to the rear as shown in FIG. 1, the first expansion chamber 83 </ b> A located at the forefront of the silencer 80 is provided for the exhaust device 7 to the motorcycle 1. In the mounted state, the first expansion chamber 83A is provided at the lowest position among the plurality of (two in the present embodiment) expansion chambers 83.
Therefore, the first expansion chamber 83A provided at the lowest position is provided with the downstream open end 72 of the exhaust pipe 70, and the drain hole 91 for communicating the inside of the silencer 80 to the outside is the first expansion chamber 83A. The expansion chamber 83A is provided in communication with the outside of the silencer 80.

That is, the outer shell portion 81 of the silencer 80 has an inner case 92 that forms a space portion 90 with the outer case 82 in a range including the first expansion chamber 83A inside the outer case 82 and is double. A tubular portion 85 having a tubular structure is provided, and a communication portion 93 that connects the first expansion chamber 83A and the space portion 90 is formed in the inner case 92.
The inner case 92 may extend in a range other than the first expansion chamber 83A, but is provided in a range including at least the first expansion chamber 83A.

A drain hole 91 is formed in the cylindrical portion 85 of the outer case 82, and the drain hole 91 is covered with an inner case (“shielding portion” in the present invention) 92 that faces the space portion 90. That is, the inner case 92 is positioned on the center line D of the drain hole 91.
Accordingly, water or the like that flows into or is generated in the first expansion chamber 83A passes through the space portion 90 via the communication portion 93 of the inner case 92 and communicates between the first expansion chamber 83A and the outside of the silencer 80. The drain hole 91 can be reached.

The separator 84 is in contact with substantially the entire circumference of the inner peripheral surface 85a of the cylindrical portion 85 of the outer case 82. However, the separator 84 is disposed on the outer peripheral portion of the separator 84 in the vertical direction below the center C in the vehicle width direction of the cylindrical portion 85. A water passage recess 84e that is separated from the inner peripheral surface 85a of the cylindrical portion 85 is formed, and water that flows along the inner peripheral surface 85a can pass therethrough.
Accordingly, the water or the like that flows into or is generated in the second expansion chamber 83B flows into the first expansion chamber 83A via the water passage recess 84e of the separator 84 and passes through the rear side communication portion 93 in the inner case 92. Thus, the drain hole 91 can be reached.
3 and 7, reference numeral 85 b is a welding opening provided in the cylindrical portion 85 in order to weld and join the separator 84 to the cylindrical portion 85.

  As described above, in the present embodiment, since the first expansion chamber 83A and the drain hole 91 communicate with each other via the communication portion 93 formed in the inner case 92, the exhaust device 7 is mounted on the motorcycle 1. Water or the like accumulated in the first expansion chamber 83A or the like provided at the lowest position can be sufficiently discharged from the drain hole 91 formed in the outer case 82 via the communication portion 93.

  At this time, since the drain hole 91 is covered by the inner case 92 with the inner case 92 facing the space portion 90 as a shielding portion, the downstream open end 72 of the exhaust pipe 70 is formed in the first expansion chamber 83A. Even if the first expansion chamber 83A and the drain hole 91 are in communication with each other, the inner case 92 prevents the exhaust sound from being directed directly to the drain hole 91, while ensuring the function of the drain hole 91. In addition, sound leakage from the drain hole 91 can be reduced.

  Furthermore, since the downstream open end 72 of the exhaust pipe 70 is disposed in the first expansion chamber 83A, the portion including the first expansion chamber 83A is affected by the pressure wave discharged from the downstream open end 72. Although the outer shell portion 81 is likely to vibrate, the outer shell portion 81 is provided with an outer case 82 and an inner case 92 in a range including at least the first expansion chamber 83A, and includes a cylindrical portion having a double cylinder structure. Therefore, the rigidity of the same part can be increased and the influence of sound caused by vibration can also be reduced.

As shown in FIGS. 3 and 4, an inner case 92 formed in a cylindrical shape is attached to the inner side of the cylindrical portion 85, but the front end portion 92 a and the rear end portion 92 b of the cylindrical inner case 92 are expanded. Then, the expanded portion 92c is welded and joined to the inside of the cylindrical portion 85 of the outer case 82.
In FIG. 3, reference numeral 85 c is a welding opening provided in the cylindrical portion 85 in order to weld and join the inner cylindrical case 92 to the cylindrical portion 85.

  Further, in FIG. 8, as shown by the arrow VIII-VIII in FIG. 3, the inner case 92 has a metal flat plate rounded into a cylindrical shape and welded by a welding joint line 94 so that the bottom surface outline of the inner case 92 is shown. The front end portion 92a and the rear end portion 92b are expanded, and the outer diameter thereof matches the inner diameter of the cylindrical portion 85.

A notch 95 is provided at the position of the weld joint line 94 in the expanded portion 92c of the inner case 92 and the inclined portion 92e leading to the small diameter portion 92d, and the notch 95 is on the weld joint line 94. The welding amount has been reduced.
Further, when the inner case 92 is attached to the tubular portion 85, the notch 95 of the expanded portion 92c and the inclined portion 92e forms the communication portion 93. The notch 95 of the expanded portion 92c is shown in FIGS. As shown in the cross-sectional view of the front portion of the silencer 80 in FIG. 5 taken along the line V-V, no step is formed in the communication portion 93 with the inner peripheral surface 85a of the cylindrical portion 85. It prevents puddles and is preferable for passing water and the like.
The space 90 formed between the small diameter portion 92d and the cylindrical portion 85 may be filled with glass wool or the like.

  As clearly shown in FIG. 8, the notch 95, that is, the communication portion 93 is provided at the front and rear ends of the inner case 92, and the drain hole 91 is formed in the communication portion 93 as shown in FIG. 3. On the other hand, since they are formed apart in the vehicle front-rear direction, the interval between the communication portion 93 and the drain hole 91 can be increased, and sound leakage can be further reduced.

  Further, since the silencer 80 is disposed obliquely upward from the front to the rear, the inner cylinder case 92 is also disposed obliquely upward from the front to the rear, and the communication portion 93 provided at the front and rear ends of the inner case 92. Has a first communication portion 93A provided at a position lower than the drain hole 91 and a second communication portion 93B provided at a position higher than the drain hole 91. The communication part 93A and the second communication part 93B are formed at positions separated in the front-rear direction, and it is possible to reduce sound leakage and discharge water or the like accumulated at a position lower than the drain hole 91. This makes it possible to easily discharge water or the like that travels from a position higher than the drain hole 91 toward a lower position.

  As shown in FIG. 2 and FIG. 6, the communication part 93 is on the vertical virtual plane Vp that is the lower part of the silencer 80 and passes through the center C in the vehicle width direction of the cylindrical part 85 of the silencer 80. Since the communication portion 93 is provided at the lowest end in the direction of gravity, water or the like generated in the silencer 80 can easily pass through the communication portion 93 and is efficiently discharged from the drain hole 91.

In the present embodiment, the drain hole 91 is formed away from the communication portion 93 in the vehicle width direction.
By forming the drain hole 91 at a position spaced apart from the communication portion 93 in the vehicle width direction as described above, the interval between the communication portion 93 and the drain hole 91 is increased, and sound leakage can be further reduced.

  Furthermore, the drain hole 91 is formed to be spaced inward in the vehicle width direction with respect to the communication portion 93, so that even if sound leaks from the drain hole 91, the drain hole 91. The sound that leaks from the vehicle is radiated inward in the vehicle width direction, making it difficult for third parties located outside the vehicle width direction, that is, outside the vehicle, to reduce the effects of sound leakage. can do.

As shown in FIG. 1, the motorcycle 1 is provided with a side stand 17. Normally, the side stand 17 is provided on the side opposite to the exhaust device 7, and on the left side in the present embodiment. As shown in FIG. 2 by the two-dot chain line on the road surface S, the motorcycle 1 is inclined to the side of the side stand 17 and to the left side.
When the drain hole 91 is formed away from the communication portion 93 in the vehicle width direction inside, that is, on the left side, the center line D of the drain hole 91 is vertical when the side stand 17 is used as shown in the figure. Since it is oriented so as to approach the direction, the discharge performance is preferably exhibited.

  Further, as shown in FIG. 4, when the vertical virtual plane Vp passing through the center C in the vehicle width direction of the cylindrical portion 85 of the silencer 80 is used as a reference, the downstream open end 72 of the exhaust pipe 70 is in the vehicle width direction. Although the drain hole 91 is disposed on the right side and the drain hole 91 is disposed on the left side in the vehicle width direction (see FIG. 6), the downstream open end 72 of the exhaust pipe 70 and the drain hole 91 in the silencer 80 Can be separated from each other in the vehicle width direction to increase the interval between them, and sound leakage from the drain hole 91 can be reduced, and the silencer 80 can be downsized in the front-rear direction.

In the present embodiment, as described above, the exhaust pipe 70 is connected to the silencer 80 from the front and extends backward in the first expansion chamber 83A, and the first pipe part 70A. A second pipe portion 70B having one end connected to the rear end and changing the direction toward the front of the vehicle, and connected to the other end of the second pipe portion 70B and a downstream open end 72 in the first expansion chamber 70A. A third pipe portion 70C extending forward so as to be located; in the silencer 80, the third pipe portion 70C is on the right side in the vehicle width direction, and the first pipe portion 70A and the drain hole 91 are on the left side in the vehicle width direction. It is arranged.
Even in the case where the exhaust pipe 91 has the first, second, and third pipe portions 70A, 70B, and 70C as described above, in the present embodiment, the downstream open end 72 of the exhaust pipe 70 in the silencer 80 is used. And the drain hole 91 can be separated from each other in the vehicle width direction to increase the distance between them, and sound leakage from the drain hole can be reduced, and interference between the first pipe portion 70A and the third pipe portion 70C can be prevented. be able to.

  In the present embodiment, the silencer 80 is formed so that the longitudinal direction of the vehicle is the longitudinal direction of the vehicle, and the outer case 82 includes a cylindrical portion 85 and a front lid portion 86 connected to the front end of the cylindrical portion 85. And a rear lid portion 87 connected to the rear end of the cylindrical portion 85, and an inner case 92 formed in a cylindrical shape is attached to the inner side of the cylindrical portion 85, and the drain hole 91 is a space portion. Since the cylindrical inner case 92 facing each other with the 90 in between is covered by the inner case 92 over a wide area, sound leakage can be reduced more effectively by the wide space part 90, and the cylindrical inner case 92 Since the case 92 is attached to the inside of the cylindrical portion 85 in the outer case 82, the rigidity of the cylindrical portion 85 that easily vibrates can be efficiently increased, and the influence of sound caused by vibration can also be reduced.

In the first embodiment, as shown in FIGS. 1, 2, and 6, the silencer 80 is suspended from the power unit 5 via a support bracket 52 attached to the cylindrical portion 85, and the silencer 80 When the vertical virtual plane Vp passing through the center C in the vehicle width direction is used as a reference, the lower portion of the cylindrical portion 85 and the support bracket 52 are attached on the vertical virtual plane Vp, and the drain hole 91 is connected to the vertical virtual plane Vp. Thus, they are offset in the vehicle width direction.
Therefore, when the support bracket 52 is attached to the lower portion of the tubular portion 85, by disposing the drain hole 91 offset in the vehicle width direction with respect to the attachment position of the tubular portion 85 and the support bracket 52, The drain hole 91 can be provided without interfering with the mounting position of the cylindrical portion 85 and the support bracket 52.
The support bracket 52 may be attached to either the outer case 82 or the front lid portion 86 of the cylindrical portion 85.

As described above, the exhaust device for the saddle riding type vehicle according to the first embodiment of the present invention has been described.
Hereinafter, an exhaust device for a saddle-ride type vehicle according to Embodiment 2 of the present invention will be described with reference to FIGS. 9 to 13.
The main part right side view of the scooter-type motorcycle 1 shown in FIG. 1 with the front wheel side omitted, and the rear cross-sectional view of the rear lower part of the motorcycle 1 taken along the line II-II in FIG. In the second embodiment, the mode of the cylindrical portion 185 of the silencer 80 in which the inner case 192 is provided inside the outer case 182 is illustrated, and the inner case 92 is provided inside the outer case 82 in the first embodiment described above. Unlike the mode of the cylindrical portion 85 of the silencer 80, and the position of the drain hole 191 of the second embodiment is different from the position of the drain hole 91 of the first embodiment shown in FIG. The other graphical representations are also referred to in the second embodiment.

In the second embodiment, members having the same configurations and functions as those of the first embodiment described above with respect to the present invention are denoted by the same reference numerals as the corresponding members in the first embodiment, and the description is simplified. Omitted.
In addition, members having configurations or functions different from those in the first embodiment are given the same reference numerals as the corresponding members in the first embodiment in the 100s, and the correspondence is clarified.

Also in the second embodiment, as shown in FIG. 1, the exhaust pipe 70 extending from the lower portion of the cylinder head 23 extends downward while being biased to the right, curves backward, and is connected to the silencer 80 to be connected to the silencer 80. 7 is constituted.
The silencer 80 is suspended from the power unit case 50 via a support bracket 52 and is located on the right side of the rear wheel 6.
The silencer 80 is oriented obliquely upward from the front to the rear, and a muffler cover 53 is attached so as to cover the upper half of the silencer.

FIG. 9 is a left side view of the exhaust device 7 showing a part of the silencer 80 and the exhaust pipe 70 as seen from the left as in FIG.
The exhaust device 7 includes a silencer 80 and an exhaust pipe 70 whose upstream side is connected to the internal combustion engine 2 and whose downstream side is connected to the silencer 80. The silencer 80 constitutes an outer shell 181. It has an outer case 182 and a separator 84 that divides the inside into a plurality of expansion chambers 83.

In FIG. 9, the outer shell portion 181 and the member for holding the pipe such as the separator 84 are shown in a vertical section excluding a part and the left half (the front side in the figure), and the pipe such as the exhaust pipe 70 is the outer shape as it is. Indicated by
In the present embodiment, the number of separators 84 is one, and the front of the separator 84, the left side in the figure is the first expansion chamber 83A, the rear side of the separator 84, the right side in the figure is the second expansion chamber 83B.

  10 is a top view of the exhaust device 7 as viewed in the direction of arrows XX in FIG. 9. The outer shell portion 181 is shown in a horizontal section excluding a part and the upper half (the front side in the figure), and the exhaust pipe. The members such as 70 and the like, and the members holding the tubes such as the separator 84 are shown as they are, except for some parts.

  The silencer 80 is formed so that the longitudinal direction of the vehicle is the longitudinal direction of the vehicle. The outer case 182 is connected to the central cylindrical portion 185 and the front end of the cylindrical portion 185 of the exhaust case 70. It has a front lid part 86 having an insertion part, and a rear lid part 87 connected to the rear end of the cylindrical part 185 and to which an exhaust discharge pipe 71 is attached.

That is, the silencer 80 includes a cylindrical portion 185 having a double cylinder structure in which an inner case 192 is provided inside an outer case 182.
In the cylindrical portion 185, the inner case 192 is provided so as to have a plate thickness smaller than that of the outer case 182 and different from each other, and in close contact with each other. In this way, the cylindrical portion 185 has a double cylinder structure in which the outer case 182 and the inner case 192 having different thicknesses and different vibration characteristics are in close contact with each other, thereby further enhancing the sound attenuation effect. .
In the present embodiment, the outer case 182 and the inner case 192 are in close contact with each other, but a double cylinder structure with a slight gap may be used.

  The exhaust pipe 70 is connected to the silencer 80 from the front side at the front lid part 86 on the left side of the vertical virtual plane Vp passing through the center C in the vehicle width direction of the cylindrical part 185 and back in the first expansion chamber 83A. One end is connected to the rear end of the first pipe portion 70A, the second pipe portion 70B that changes direction toward the front of the vehicle, and the other end of the second pipe portion 70B. And a third pipe portion 70C which is disposed on the right side of the vertical virtual plane Vp and extends forward so that the downstream open end 72 is positioned in the first expansion chamber 83A.

Specifically, the first pipe portion 70A includes an expanded pipe portion 70Aa that accommodates an exhaust gas processing catalyst in the vicinity of the connection portion with the front lid portion 86. The first tube portion holding hole 88a of 88 is inserted and held, and further, the first tube portion holding hole 84a of the separator 84 is inserted and held, and the rear end is positioned in the second expansion chamber 83B.
One end of the second pipe portion 70B is connected to the rear end of the first pipe portion 70A, and the second pipe portion 70B makes a U-turn so as to turn from the left side to the right side of the vertical virtual plane Vp in the second expansion chamber 83B. Thus, the other end is connected to the upstream end of the third pipe portion 70C in the second expansion chamber 83B.
The third pipe part 70C is inserted and held through the third pipe part insertion hole 84c of the separator 84, extends into the first expansion chamber 83A, and is inserted and held through the third pipe part holding hole 88c of the exhaust pipe holder 88. At the same time, the downstream open end 72 is positioned in the first expansion chamber 83A.

The inner case 192 extends from a position in front of the exhaust holder 88 to a position overlapping the separator 84 so as to be in close contact with the inner surface of the outer case 182. The inner case 192 is formed shorter than the outer case 182 in the longitudinal direction.
As shown in FIG. 12, which is a cross-sectional view of the exhaust pipe holder 88 and the outer shell portion 181 as viewed in the direction of arrows XII-XII in FIGS. 9 and 10, the exhaust pipe holder 88 includes the first pipe portion 70A and the third pipe. The first expansion chamber 83 </ b> A is not partitioned by a cross beam-like member that holds the portion 70 </ b> C and is attached to the inner case 192.

The downstream side from the downstream open end 72 of the third pipe part 70C becomes an exhaust open part 73 in which the tube wall is formed in a porous plate shape, and the downstream end is closed, and the inside of the first expansion chamber 83A is closed. Release the exhaust pressure slowly.
9 and 12, reference numeral 192f indicates a plug welding point at which the exhaust pipe holder 88, the inner case 192, and the outer case 182 are joined by plug welding. The inner case 192 is positioned with respect to the outer case 182 by the plug welding point 192f, and the tubular portion 185 has a double structure in which the inner case 192 and the outer case 182 having different thicknesses and different vibration characteristics are brought into close contact with each other. Due to the cylindrical structure, the attenuation effect of the exhaust sound by the exhaust gas discharged from the exhaust opening 73 of the third pipe 70C into the first expansion chamber 83A is further enhanced.

Further, as shown in FIG. 13, which is a rear view of the separator 84 as viewed in the direction of arrows XIII-XIII in FIGS. 9 and 10, the separator 84 includes a first tube portion insertion hole 84 a and a third tube portion insertion hole 84 c. A communication pipe insertion hole 84d is provided slightly below, and a communication pipe 89 for connecting the first expansion chamber 83A and the second expansion chamber 83B is inserted and fixed.
An exhaust discharge pipe 71 is attached to the rear lid portion 87 so that the exhaust device 7 is mounted rearward on the motorcycle and is inclined rearward and slightly inclined downward.

Thus, the exhaust gas sent from the internal combustion engine 2 is treated with the exhaust gas treating catalyst in the expanded pipe portion 70Aa of the first pipe portion 70A of the exhaust pipe 70, and then passes through the first pipe portion 70A to be the first. The first expansion chamber 83A passes through the expansion chamber 83A, passes through the second pipe portion 70B, passes through the second expansion chamber 83B, and extends from the exhaust opening 73 on the downstream side of the downstream open end 72 of the third pipe portion 70C. Flows into.
The exhaust gas whose exhaust pressure has been released in the first expansion chamber 83A flows into the second expansion chamber 83B through the communication pipe 89, further releases the exhaust pressure, and is discharged to the outside from the exhaust discharge pipe 71.

Since the silencer 80 is oriented obliquely upward from the front to the rear as shown in FIG. 1, the first expansion chamber 83 </ b> A located at the forefront of the silencer 80 is provided for the exhaust device 7 to the motorcycle 1. In the mounted state, the first expansion chamber 83A is provided at the lowest position among the plurality of (two in the present embodiment) expansion chambers 83.
Accordingly, in the first expansion chamber 83A provided at the lowest position, the downstream open end 72 of the exhaust pipe 70 is provided, and the drain hole 191 for communicating the inside of the silencer 80 to the outside is provided in the first expansion chamber 83A. The expansion chamber 83A is provided in communication with the outside of the silencer 80.

Specifically, as shown in FIG. 11, which is a cross-sectional view of the front portion of the silencer as viewed in the direction of arrows XI-XI in FIGS. 9, 10, and 10, the front lid portion 86 of the outer case 182. A drain hole 191 is formed in the lower part of the substrate. The drain hole 191 is covered with a shielding member (“shielding part” in the present invention) 197 attached to the inner surface of the front lid part 86 so as to face the drain hole 191. That is, the shielding member 197 is positioned on the center line D of the drain hole 191.
Accordingly, the water or the like that flows into or is generated in the first expansion chamber 83A reaches the front lid portion 86 and can reach the drain hole 91.
The drain hole 191 may be provided in the front lid portion 86 or may be provided in the cylindrical portion 185 constituted by the inner case 192 and the outer case 182. In any case, the shielding member 197 is provided so as to cover the drain hole 191 in the first expansion chamber 83A, that is, so that the shielding member 197 is positioned on the center line D of the drain hole 191.

The separator 84 is in contact with substantially the entire circumference of the inner peripheral surface 185a of the cylindrical portion 185 of the outer case 82. However, in the vertical direction below the center C of the cylindrical portion 185 in the vehicle width direction, A water passage recess 84e that is separated from the inner peripheral surface 185a of the cylindrical portion 185 is formed, and allows passage of water or the like flowing along the inner peripheral surface 185a.
Therefore, the water or the like that flows into the second expansion chamber 83B or is generated can flow into the first expansion chamber 83A through the water passage recess 84e of the separator 84 and reach the drain hole 191.
As shown in FIGS. 10, 12, and 13, the inner case 192 is closely attached except for the central lower portion 185d of the inner peripheral surface 185a of the cylindrical portion 185 of the outer case 182, and the water passage recess. Water or the like that has passed through 84e flows down the central lower portion 185d of the inner peripheral surface 185a without any trouble and reaches the drain hole 191.

  As described above, in the second embodiment, water or the like accumulated in the first expansion chamber 83A provided at the lowest position when the exhaust device 7 is mounted on the motorcycle 1 is stored in the first expansion chamber 83A. And the drain hole 191 communicating with the outside of the silencer 80 can be sufficiently discharged.

  At this time, since the drain hole 191 is covered with the shielding member 197 disposed in the first expansion chamber 83A, the downstream open end 72 of the exhaust pipe 70 is disposed in the first expansion chamber 83A. Even if the first expansion chamber 83A and the drain hole 191 communicate with each other, the exhaust sound is prevented from being directed directly to the drain hole 191, and the sound leakage from the drain hole 19 is ensured while ensuring the function of the drain hole 191. Can be reduced.

  Furthermore, since the downstream open end 72 of the exhaust pipe 70 is disposed in the first expansion chamber 83A, the portion including the first expansion chamber 83A is affected by the pressure wave discharged from the downstream open end 72. The outer shell portion 181 is easy to vibrate, but the outer shell portion 181 is provided with an inner case 192 inside the outer case 182 and is provided with a cylindrical portion 185 having a double cylinder structure. The effect of sound caused by vibration can also be reduced.

Further, in the cylindrical portion 185, the inner case 192 is provided so that the plate thickness is smaller than that of the outer case 182 and the thicknesses are different from each other and are in close contact with each other.
In this way, the cylindrical portion 185 has a double cylinder structure in which the outer case 182 and the inner case 192 having different thicknesses and different vibration characteristics are in close contact with each other, thereby further enhancing the sound attenuation effect. .

In the second embodiment, as shown in FIGS. 1, 2, and 11, the silencer 80 is suspended from the power unit 5 via a support bracket 52 attached to the cylindrical portion 185, and the silencer 80 When the vertical virtual plane Vp passing through the center C in the vehicle width direction is used as a reference, the lower portion of the cylindrical portion 185 and the support bracket 52 are attached on the vertical virtual plane Vp, and the drain hole 191 is connected to the vertical virtual plane Vp. Thus, they are offset in the vehicle width direction.
Therefore, when the support bracket 52 is attached to the lower portion of the tubular portion 185, by disposing the drain hole 191 offset in the vehicle width direction with respect to the attachment position of the tubular portion 185 and the support bracket 52, The drain hole 191 can be provided without interfering with the mounting position of the cylindrical portion 185 and the support bracket 52.
The support bracket 52 may be attached to either the outer case 182 or the front lid portion 86 of the cylindrical portion 185.

Alternatively, the silencer 80 is formed so that the longitudinal direction of the vehicle is the longitudinal direction, and the outer case 182 includes a cylindrical portion 185, a front lid portion 86 connected to the front end of the cylindrical portion 185, and the cylindrical portion 185. A silencer 80 connected to the rear end of the silencer 80. The silencer 80 is suspended from the power unit 5 via a support bracket 52 attached to the front lid 86, and the silencer 80 has a center in the vehicle width direction. When the vertical virtual plane Vp passing through C is used as a reference, the lower portion of the front lid 86 and the support bracket 52 are attached on the vertical virtual plane Vp, and the drain hole 191 is a vehicle width with respect to the vertical virtual plane Vp. It may be arranged to be offset in the direction.
In that case, even when the support bracket 52 is attached to the lower portion of the front lid portion 86, the drain hole 191 is offset in the vehicle width direction with respect to the attachment position of the front lid portion 86 and the support bracket 52. Thus, the drain hole 191 can be provided without interfering with the mounting position of the front lid portion 86 and the support bracket 52.

As mentioned above, although the exhaust system of the saddle riding type vehicle according to the embodiment of the present invention has been described, the aspect of the present invention is not limited to the above-described embodiment, and various aspects are possible within the scope of the gist of each claim of the present invention. Of course, what is implemented is included.
For example, the straddle-type vehicle is not limited to the scooter type motorcycle of the embodiment, but may be a different type of motorcycle, buggy, or the like, and the internal combustion engine is of a different type such as the number of cylinders. May be.
Further, the arrangement of the left and right of each device has been described specifically for the convenience of description of the embodiment, but may be an arrangement that is opposite to the one shown in the above embodiment. include.

  DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Internal combustion engine, 3 ... Power transmission device, 4 ... Body frame, 5 ... Power unit, 6 ... Rear wheel, 7 ... Exhaust device, 21 ... Crankshaft, 23 ... Cylinder head, 40B ... Rear main frame 50 ... Power unit case, 51 ... Hanger part, 52 ... Support bracket, 70 ... Exhaust pipe, 70A ... First pipe part, 70Aa ... Expanded part, 70B ... Second pipe part, 70C ... Third pipe part, 71 ... Exhaust Discharge pipe, 72 ... downstream open end, 73 ... exhaust opening, 80 ... silencer, 81 ... outer shell, 82 ... outer case, 83 ... expansion chamber, 83A ... first expansion chamber, 83B ... second expansion chamber 84 ... Separator, 85 ... Cylindrical part, 85a ... Inner peripheral surface, 86 ... Front cover part, 87 ... Rear cover part, 88 ... Exhaust pipe holder, 89 ... Communication pipe, 90 ... Space part, 91 ... Drain hole, 92 ... Inner case, 92a ... Front end, 92b ... Rear end, 92c ... Expanded part, 92d ... Small diameter part, 92e ... Inclined part, 94 ... Weld joint line, 95 ... Notch, 181 ... Outer shell , 182 ... outer case, 185 ... cylindrical part, 185a ... inner peripheral surface, 191 ... drain hole, 192 ... inner case, 197 ... shielding member ("shielding part" in the present invention), C ... (cylindrical part 85, 185) center in the vehicle width direction, D ... center line (of drain holes 91, 191), Vp ... vertical virtual plane, S ... virtual road surface

Claims (13)

An exhaust system comprising a silencer (80) and an exhaust pipe (70) having an upstream side connected to the internal combustion engine (2) and a downstream side connected to the silencer (80),
The silencer (80) has an outer case (82, 182) that constitutes the outer shell portion (81, 181), and a separator (84) that divides the interior into a plurality of expansion chambers (83),
When the exhaust device is mounted on the saddle riding type vehicle (1), the exhaust pipe (70) is placed in the first expansion chamber (83A) provided at the lowest position among the plurality of expansion chambers (83). A downstream open end (72) is disposed;
In an exhaust system for a saddle-ride type vehicle provided with drain holes ( 91, 191) for communicating the first expansion chamber (83A) and the outside of the silencer (80),
The silencer (80) includes a cylindrical portion (85,185) having a double cylindrical structure in which an inner case (92,192) is provided inside the outer case (82,182),
In the first expansion chamber (83A), a shielding part (92,197) covering the drain hole (91,191) is provided ,
A water passage recess (84e) formed by separating the outer peripheral portion of the separator (84) from the inner peripheral surface (85a, 185a) of the cylindrical portion (85, 185) is a vehicle width direction of the silencer (80). An exhaust system for a saddle-ride type vehicle , provided vertically below the center (C), wherein the drain hole (91) is spaced apart inward in the vehicle width direction with respect to the water passage recess (84e). .   The silencer (80) is suspended from the power unit (5) via a support bracket (52) attached to the cylindrical portion (85, 185),
  When the vertical virtual plane (Vp) passing through the vehicle width direction center (C) of the silencer (80) is used as a reference, the lower portion of the cylindrical portion (85, 185) and the support bracket (52) are 2. The flat surface (Vp) is attached, and the drain hole (91, 191) is disposed offset in the vehicle width direction with respect to the vertical virtual plane (Vp). An exhaust system for a saddle-ride type vehicle.   The silencer (80) is formed so that the longitudinal direction of the vehicle is the longitudinal direction,
  The outer case (182) is connected to the cylindrical portion (185), a front lid portion (86) connected to the front end of the cylindrical portion (185), and a rear end of the cylindrical portion (185). And a rear lid portion (87) to be
  The silencer (80) is suspended from the power unit (5) via a support bracket (52) attached to the front lid (86).
  When the vertical virtual plane (Vp) passing through the vehicle width direction center (C) of the silencer (80) is used as a reference, the lower part of the front lid (86) and the support bracket (52) are The mounting according to claim 1, wherein the drain hole (191) is mounted on a plane (Vp) and is offset in the vehicle width direction with respect to the vertical virtual plane (Vp). An exhaust system for a saddle-ride type vehicle. The outer shell portion (81) is provided inside the outer case (82) within a range including at least the first expansion chamber (83A), and a space portion (90) between the outer case (82) and the outer case (82). Said inner case (92) forming
The inner case (92) is formed with a communication part (93) for communicating the first expansion chamber (83A) and the space part (90),
The drain hole (91) is formed in the outer case (82), and the inner case (92) facing the space portion (90) with the inner case (92) as the shielding portion (92). The exhaust device for a saddle-ride type vehicle according to any one of claims 1 to 3, wherein the exhaust device is covered with a hood. The silencer (80) is formed so that the longitudinal direction of the vehicle is the longitudinal direction,
The exhaust device for a saddle-ride type vehicle according to claim 4 , wherein the drain hole (91) is formed away from the communication portion (93) in the vehicle front-rear direction. The communication part (93) includes a first communication part (93A) provided at a position lower than the drain hole (91) and a second communication part (93A) provided at a position higher than the drain hole (91). 93. The exhaust device for a saddle-ride type vehicle according to claim 5 , further comprising: 93B). The exhaust device for a saddle-ride type vehicle according to claim 4 , wherein the drain hole (91) is formed away from the communication part (93) in the vehicle width direction. The exhaust device for a saddle-ride type vehicle according to claim 7 , wherein the drain hole (91) is formed to be separated from the communication portion (93) inward in the vehicle width direction. The communication portion (93) is formed on a vertical virtual plane (Vp) that is below the silencer (80) and passes through the center (C) in the vehicle width direction of the silencer (80). The exhaust device for a saddle riding type vehicle according to claim 4 , When the vertical virtual plane (Vp) passing through the vehicle width direction center (C) of the silencer (80) is taken as a reference, the downstream open end (72) of the exhaust pipe (70) is one side in the vehicle width direction. to be disposed, said drain hole (91) is an exhaust device of a saddle-ride type vehicle according to claim 1, characterized in that arranged on the other side in the vehicle width direction. The exhaust pipe (70) is connected to the silencer (80) from the front and extends backward in the first expansion chamber (83A), and the first pipe part. One end is connected to the rear end of (70A) and the second pipe part (70B) that changes direction toward the front of the vehicle, and the other end of the second pipe part (70B) is connected to the other end and the downstream side is opened. A third pipe portion (70C) extending forward so that the end (72) is located in the first expansion chamber (83A);
In the silencer (80), the third pipe portion (70C) is disposed on one side in the vehicle width direction, and the first pipe portion (70A) and the drain hole (91) are disposed on the other side in the vehicle width direction. The exhaust device for a saddle-ride type vehicle according to claim 1 , wherein the exhaust device is provided. The silencer (80) is formed so that the longitudinal direction of the vehicle is the longitudinal direction,
The outer case (82) is connected to the cylindrical portion (85), the front lid portion (86) connected to the front end of the cylindrical portion (85), and the rear end of the cylindrical portion (85). And a rear lid portion (87)
The exhaust system for a saddle-ride type vehicle according to claim 1 , wherein the inner case (92) formed in a cylindrical shape is attached to the inner side of the cylindrical portion (85). In the tubular portion (185), wherein the outer casing (182) and said inner casing (192), and different in thickness from each other, according to claim 1 or claims characterized in that provided in intimate with each other The exhaust device for a saddle riding type vehicle according to any one of items 3 to 4 .

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