JP2010059943A - Exhaust device for motorcycle and motorcycle with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust device for a motorcycle connecting each of exhaust pipes without increasing the number of parts and ensuring flexibility of designing. <P>SOLUTION: An exhaust device 50 for the motorcycle is equipped with a V-type engine E having a rotary axis AX in a vehicle width direction. The exhaust device 50 is equipped with: exhaust pipes 14, 15 led on the right side of a vehicle body from a front cylinder 12 and a rear cylinder 13, respectively; mufflers 17L, 17R, disposed on the both right and left lateral sides of the vehicle body, respectively; and a collecting pipe 16 disposed on the right side. The collecting pipe 16 is connected to the exhaust pipes 14, 15 of the both cylinders 12, 13 and the mufflers 17L, 17R on the both right and left sides. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust device for a motorcycle having an assembly portion in which exhaust pipes derived from a front cylinder and a rear cylinder of a V-type engine gather.

  An exhaust system for a motorcycle equipped with a V-type engine has an exhaust pipe led out from a front cylinder and an exhaust pipe led out from a rear cylinder connected to a single exhaust chamber at the bottom of the vehicle body. There is a type of connecting a muffler (Patent Document 1).

JP 2007-1000066 A

  However, in the exhaust device of Patent Document 1, the exhaust chamber has a size in the vehicle width direction that is substantially the same as that of the vehicle body frame. Therefore, the exhaust chamber presses the space below the vehicle body and reduces the degree of freedom in designing a motorcycle.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an exhaust device for a motorcycle that can suppress space compression and improve the degree of design freedom, and a motorcycle including the exhaust device.

  In order to achieve the above object, an exhaust device for a motorcycle according to the present invention is an exhaust device for a motorcycle equipped with a V-type engine having a rotational axis in the vehicle width direction, and includes a vehicle body from a front cylinder and a rear cylinder. An exhaust pipe led out to one side in the vehicle width direction, a muffler arranged on both the left and right sides of the vehicle body, and a collecting pipe arranged on the one side, the collecting pipe having the two cylinders The exhaust pipe and the left and right mufflers are connected.

  According to this configuration, the exhaust gas from the front and rear cylinders is mixed in the collecting pipe disposed on the side of the vehicle body, and the exhaust gas is guided to the left and right mufflers branched from the collecting pipe. By arranging the collecting pipe on the side of the vehicle body in this way, an exhaust chamber at the lower part of the vehicle body becomes unnecessary, so that the space in the lower part of the vehicle body is prevented from being compressed, and the degree of freedom in motorcycle design can be improved.

  In the present invention, it is preferable that the collecting pipe is located in front of the rear wheel and behind the engine. According to this configuration, a free space between the engine and the rear wheel can be effectively utilized behind the engine, and the degree of freedom in design can be further improved.

  In the present invention, it is preferable that the collecting pipe is located on the opposite side of the power transmission mechanism that transmits the power of the V-type engine to the rear wheel with respect to the center line of the vehicle body extending in the front-rear direction. According to this configuration, interference between the collecting pipe and the exhaust pipe and the power transmission mechanism can be easily avoided, and the degree of freedom in design can be further improved.

  In the present invention, a connection port to the collecting pipe in the exhaust pipe from the front cylinder and a connecting port to the collecting pipe in the one side muffler are arranged on the same straight line and face each other. It is preferable. According to this configuration, the flow of exhaust gas from the exhaust pipe of the front cylinder through the collecting pipe to the muffler becomes smooth, so that the exhaust resistance is reduced and the exhaust efficiency can be improved.

  In the present invention, the axis of the downstream end connected to the collecting pipe in the exhaust pipe from the front cylinder and the axis of the downstream end connected to the collecting pipe in the exhaust pipe from the rear cylinder are It is preferable that they intersect within the collecting pipe. According to this configuration, the exhaust gas that merges from both exhaust pipes into the collecting pipe collides and mixes at the intersection in the collecting pipe, so that the exhaust gas flowing to each muffler is homogenized and the catalytic action in both mufflers is Balance can be suppressed.

  A motorcycle according to the present invention includes a body frame, a front cylinder that has a rotation axis in the vehicle width direction of the vehicle body, and that leans forward at the top of the crankcase and a rear cylinder that leans backward. A supported V-type engine, a collecting pipe disposed on one side in the vehicle width direction of the body frame, and the front cylinder are connected to the front cylinder and led out to one side in the vehicle width direction of the body frame. A first exhaust pipe extending rearward and connected to the collecting pipe, and connected to the rear cylinder, led out from the rear cylinder to the one side, and extended rearward and connected to the collecting pipe. 2 exhaust pipes, a first muffler disposed on one side in the vehicle width direction of the rear wheel, a second muffler disposed on the other side in the vehicle width direction of the rear wheel, and extending rearward from the collecting pipe A first connecting pipe connected to the first muffler and extending from the collecting pipe to the other side in the vehicle width direction. A second connection pipe passing between the engine and the rear wheel and connected to the second muffler, wherein the collecting pipe includes the first exhaust pipe, the second exhaust pipe, the first connection pipe and the second connection pipe. The connecting pipe has four openings to be connected separately.

  According to this configuration, the exhaust gas guided from the front and rear cylinders to the collecting pipe disposed outside the vehicle body frame joins and stirs in the collecting pipe, and then branches from the collecting pipe and is sent to the muffler. . As described above, since the joining portion and the branching portion of the exhaust pipe are arranged on the outer side of the vehicle body frame, it is not necessary to arrange the joining portion and the branching portion below the vehicle body frame, and the degree of freedom in vehicle body design is improved. be able to. Furthermore, since the second connection pipe passes between the rear wheel and the engine and does not pass below the engine, the degree of freedom in design can be further increased.

  According to the exhaust device for a motorcycle of the present invention, the exhaust pipe and the muffler of the front cylinder and the rear cylinder are connected to the collecting pipe arranged on one side of the body frame, so that the space under the vehicle body is compressed. This can improve the freedom of motorcycle design.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In this specification, the left and right sides of the vehicle body are the left and right as viewed from the rider in the riding posture.
FIG. 1 is a side view showing a motorcycle including an exhaust device according to a first embodiment of the present invention. In the motorcycle shown in the figure, a head pipe 2 is attached to front ends of a main frame 1 and a down tube 18 constituting the front half of a body frame FR, and a steering shaft that is rotatably inserted into the head pipe 2. The upper bracket 7 and the lower bracket 8 are supported via (not shown), the front fork 3 is supported by the upper bracket 7 and the lower bracket 8, and the front wheel 4 is supported by the lower end portion of the front fork 3. . A handle 5 is attached to the upper bracket 7 at the upper end of the front fork 3. A V-type 2-cylinder engine E is supported on the main frame 1 and the down tube 18. The engine E has a rotational axis AX in the vehicle width direction, and drives the rear wheels 9 by a belt 25 (FIG. 2) that is a power transmission mechanism located on the left side of the vehicle body.

  The main frame 1 is bent downward at a bending portion 11 and is connected to the swing arm bracket 6, and two left and right seat rails 10 extending rearward are connected to the bending portion 11. The down tube 18 extends from the falling part 18a at the front part through the horizontal part 18b below the engine E, and the rear half part extends further upward from the swing arm bracket 6 and is connected to the seat rail 10 on the left and right sides. The reinforcing member 19 is formed. A rider's seat 30 and a passenger's seat 31 are supported on the seat rail 10. A fuel tank 20 is attached between the handle 5 and the rider's seat 30 at the upper part of the main frame 1, that is, at the upper part of the vehicle body. A resin cowling 21 is mounted on the front portion of the vehicle body to cover a portion from the front of the handle 5 to the upper side of the front portion of the vehicle body. A footrest 26 on which the rider's feet are placed is attached to the horizontal portion 18 b of the down tube 18.

  The engine E has a front cylinder 12 tilted forward at the top of the crankcase 22 and a rear cylinder 13 tilted rearward, and a space between the cylinders 12 and 13 is a V-shaped V-bank space in a side view. The air cleaner 40 is disposed in the V bank space. Each of the cylinders 12 and 13 has a cylinder 23 connected to the crankcase 22 and a cylinder head 24 connected to the upper part thereof. The upstream ends of the first and second exhaust pipes 14 and 15 are connected to the cylinder heads 24 of the front cylinder 12 and the rear cylinder 13 of the engine E, respectively. Both exhaust pipes 14 and 15 are led out to the right side of the vehicle body and extend rearward, and their downstream end portions are connected to a collecting pipe 16 located on the right side of the vehicle body. By arranging the exhaust pipes 14 and 15 on the right side in this way, it is possible to prevent interference with a stand or a generator arranged on the left side of the vehicle body. As will be described later, the collecting pipe 16 branches right and left and is connected to a pair of left and right mufflers 17L and 17R (FIG. 2).

  The collecting pipe 16 is disposed outside the down tube 18 in front of the rear wheel 9 and behind the engine E, that is, between the transmission / clutch unit 27 and the rear wheel 9 at the rear of the engine E. In the example of FIG. 1, the lower end portion 19 a of the reinforcing member 19 and the collecting pipe 16 overlap each other in a side view. Further, the lower end of the collecting pipe 16 is set slightly above the lower end of the horizontal portion 18b. Thus, since the collecting pipe 16 is located outside the horizontal portion 18b of the down tube 18 and above the lower end of the horizontal portion 18b, the collecting pipe 16 can be disposed without compressing the space below the vehicle body. As a result, the degree of freedom in design can be increased, and the center of the motorcycle can be lowered by disposing the down tube 18 downward. Further, by disposing the down tube 18 downward, the space between the main frame 1 and the down tube 18 can be widened, and the degree of freedom of arrangement and shape of components is improved. The first exhaust pipe 14 from the front cylinder 12 extends obliquely rearward and downward from the cylinder head 24, and then curves backward after being lowered to the vicinity of the horizontal portion 18 b of the downtube 18. It extends substantially horizontally along the outside of the tube and is connected to the collecting pipe 16. The second exhaust pipe 15 from the rear cylinder 13 extends downward and obliquely backward while being curved from the cylinder head 24, and is connected to the collecting pipe 16 from a substantially vertical direction.

  As shown in FIG. 2 which is a bottom view of the vehicle body, the collecting pipe 16 and the right muffler 17R are connected to each other by a first connecting pipe 52 extending substantially horizontally from the collecting pipe 16 to the rear. The collecting pipe 16 and the left muffler 17L are connected by a second connecting pipe 54. The second connecting pipe 54 is curved from the lower part of the collecting pipe 16 and extends to the left side, crosses a center line C extending in the front-rear direction of the vehicle body between the engine E and the rear wheel 9 and in the vicinity of the left down tube 18. It curves backward and is connected to the left muffler 17L. The collecting pipe 16 is located on the opposite side of the belt 25 with respect to the center line C of the vehicle body. The first exhaust pipe 14 is disposed closer to the vehicle body than the clutch cover 27a covering the right side surface of the transmission / clutch unit 27, and protrudes outward from the vehicle body so as not to impair the appearance. Although not shown in the present embodiment, by covering the collecting pipe 16 with a cover, the connection portion between the collecting pipe 16 and each exhaust pipe 14, 15 and each connecting pipe 52, 54 is hidden to further improve the appearance. Can do.

  As shown in FIG. 3 which is an exploded view, the exhaust device 50 is connected to a first exhaust pipe 14 from the front cylinder 12, a second exhaust pipe 15 from the rear cylinder 13, a collecting pipe 16, and a right muffler 17R. The first connecting pipe 52, the second connecting pipe 54 connected to the left muffler 17L, and the left and right mufflers 17L and 17R. Each of the exhaust pipes 14 and 15 and each of the connection pipes 52 and 54 is formed by covering a metallic pipe such as steel with a glossy plating. The collecting pipe 16 is formed by joining a plurality of pipes by welding. That is, the introduction pipe 61 and the lead-out pipe 62 that form the connection portion are joined to the central part of the main pipe 60 extending in the front-rear direction. As shown in FIG. 4, which is a longitudinal sectional view, the introduction pipe 61 has an upper opening 61 a that opens upward, and the outlet pipe 62 has a lower opening 62 a that opens diagonally to the left. The base 61a of the introduction pipe 61 and the 62a of the outlet pipe 62 face each other in the vertical direction. The collecting pipe 16 may be formed by integrally molding the main pipe 60, the introducing pipe 61 and the outlet pipe 62 by casting.

  Returning to FIG. 3, the exhaust pipes 14 and 15 and the connection pipes 52 and 54 are connected to the collecting pipe 16 by welding. That is, the downstream end 14 b of the first exhaust pipe 14 is connected to the front end opening 60 a that forms the connection portion of the main pipe 60 of the collecting pipe 16, and the downstream end 15 b of the second exhaust pipe 15 is connected to the introduction pipe 61. The first connection pipe 52 is connected to the rear end opening 60 b that forms the connection part of the main pipe 60, and the second connection pipe 54 is connected to the outlet pipe 62. Thus, the collecting pipe 16 has four openings 60a, 60b, 61a, 62a to which the exhaust pipes 14, 15 and the connection pipes 52, 54 are separately connected. The mufflers 17L and 17R are fitted to the outer peripheries of the connection pipes 52 and 54, respectively, and are detachably connected by a fixture 82, and are supported by the vehicle body frame FR (FIG. 1) via a stay (not shown). A catalyst (not shown) for purifying the exhaust gas is built in the mufflers 17L and 17R.

  The exhaust device 50 is assembled in the following procedure and attached to the vehicle body. First, the collecting pipe 16 including the main pipe 60, the introduction pipe 61, and the outlet pipe 62 shown in FIG. 3 is formed by pipe processing and welding. Next, the first exhaust pipe 14, the first connection pipe 52, the second exhaust pipe 15, and the second connection pipe 54 are fitted into the openings 60a, 60b, 61a, and 62a of the collecting pipe 16 for welding. By connecting by such a fixing means, one piping unit is obtained. Furthermore, this piping unit is attached to the vehicle body. Specifically, mounting flanges 64 and 66 are formed at the upstream end portions 14a and 15a of the first and second exhaust pipes 14 and 15, respectively, and are detachably attached to the cylinder head 24 by a fastening member 80 such as a bolt. Attach to. Finally, the mufflers 17R and 17L are connected to the connecting pipes 52 and 54 using the fixture 82 as described above, and the mufflers 17R and 17L are attached to the vehicle body frame FR via a stay (not shown). Thus, since the exhaust pipes 14 and 15, the connection pipes 52 and 54, and the collecting pipe 16, which are parts of the exhaust device 50 excluding the mufflers 17 L and 17 R, form a single unit, assembly into a motorcycle is possible. Handling at the time becomes easy, and the number of assembly steps can be reduced.

  The opening of the downstream end portion 14b of the first exhaust pipe 14, that is, the connecting port 56 to the collecting pipe 16, and the connecting port 58 to the collecting pipe 16 in the connecting pipe 52 connected to the right muffler 17R are the same straight line C1. Located on top of each other. Further, as shown in FIG. 4, the axis lines C <b> 1 and C <b> 2 of the exhaust pipes 14 and 15 intersect each other. The exhaust gas from the exhaust pipes 14 and 15 collides at the intersection CP, thereby promoting the mixing of the exhaust gas. By mixing the exhaust gas in this way, exhaust pulsation can be reduced to reduce the pressure load of the exhaust device, and the temperature of the exhaust gas flowing through the left and right mufflers 17L and 17R can be made uniform. In particular, the purification effect of the catalyst at the time of starting the engine can be enhanced. However, the axes C1 and C2 may be slightly shifted. The intersecting angle between the downstream end portion 14b of the first exhaust pipe 14 and the downstream end portion 15b of the second exhaust pipe 15, that is, the intersecting angle α formed between the axes C1 and C2 of the exhaust pipes 14 and 15, respectively, is 70 to 90. It is preferably within the range of °. In this embodiment, it is 77.6 °.

  As shown in FIG. 3, when the length along the flow path of the first exhaust pipe 14 is F1, and the length of the second exhaust pipe 15 is F2, F1> F2. Further, as shown in FIG. 2, R1 <R2 where R1 is the length along the flow path of the first connecting pipe 52 and R2 is the length of the second connecting pipe 54. Therefore, the difference between the combined length (F1 + R1) of the first exhaust pipe 14 and the first connecting pipe 52 and the combined length (F2 + R2) of the second exhaust pipe 15 and the second connecting pipe 54, that is, the front The difference D (= (F1 + R1) − (F2 + R2)) between the tube length from the cylinder 12 to the muffler 17R and the tube length from the rear cylinder 13 to the muffler 17L is extremely small. This difference D is preferably within 200 mm, more preferably within 100 mm, and in the present embodiment, the difference D is substantially zero.

  As described above, the connection port 56 of the first exhaust pipe and the connection port 58 of the first connection pipe 52 are arranged on the same straight line C1 and face each other (FIG. 3), and lead out from the base 61a of the introduction pipe 61. Since the pipe 62 faces the vertical direction 62a (FIG. 4), the exhaust gas from the front cylinder 12 easily flows into the muffler 17R, and the exhaust gas from the rear cylinder 13 easily flows into the muffler 17L. Therefore, by making the lengths of (F1 + R1) and (F2 + R2) substantially the same, the unbalance between the cylinders 12 and 13 can be suppressed, and the engine performance can be fully exploited. Further, since the exhaust pipes 14 and 15 and the connection pipes 52 and 54 are connected by the collecting pipe 16, the exhaust pipes are connected to the mufflers 17R and 17L directly from the cylinders 12 and 13, respectively. Since there is no crossing at the side of the vehicle body, the exhaust pipe is prevented from protruding outward from the vehicle body, and the appearance of the motorcycle is improved.

  In the above-described configuration, the conventional exhaust chamber at the lower part of the vehicle body connecting the exhaust pipes 14 and 15 shown in FIG. 1 is not necessary, so that the space in the lower part of the vehicle body is prevented from being compressed, and the degree of freedom in designing the motorcycle can be improved. Further, since the collecting pipe 16 is located on the opposite side of the belt 25 with respect to the center line C of the vehicle body extending in the front-rear direction, the collecting pipe 16 and the exhaust pipes 14 and 15 can be easily interfered with the belt 25. Therefore, the degree of freedom in design is further improved.

  Furthermore, since the collecting pipe 16 is located in front of the rear wheel 9 and behind the engine E, the vacant space between the engine E and the rear wheel 9 can be used effectively behind the engine E. Therefore, the degree of freedom in design can be improved. Further, the connection port 56 to the collecting pipe 16 in the first exhaust pipe 14 shown in FIG. 3 and the connecting port 58 to the collecting pipe 16 in the first connection pipe 52 are arranged on the same straight line C1 and face each other. Therefore, the flow of exhaust gas passing through the collecting pipe 16 from the first exhaust pipe 14 becomes smooth, so that the exhaust resistance is reduced and the exhaust efficiency can be improved.

  Further, the intersection angle between the axis of the downstream end 60 connected to the collecting pipe 16 in the exhaust pipe 14 and the axis of the downstream end 62 connected to the collecting pipe 16 in the exhaust pipe 15 is 70 to 90 °. Since the exhaust gas that joins the exhaust pipes 14 and 15 to the collecting pipe 16 collides and is mixed at the intersection CP in the collecting pipe 16, the exhaust gas flowing to the mufflers 17L and 17R is homogenized. In addition, it is possible to suppress an imbalance of the catalytic action in both the mufflers 17L and 17R.

  As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. For example, in the above embodiment, the collecting pipe 16 is disposed on the outer side of the down tube 18, but a part of the collecting pipe 16 may be located above the down tube 18. Therefore, such a thing is also included in the scope of the present invention.

1 is a side view showing a motorcycle including an exhaust device according to a first embodiment of the present invention. It is a bottom view of the same motorcycle. It is an exploded view of an exhaust apparatus same as the above. It is a longitudinal cross-sectional view of an exhaust apparatus same as the above.

Explanation of symbols

E Engine FR Body frame 12 Front cylinder 13 Rear cylinder 14 First exhaust pipe 14b First exhaust pipe downstream end 15 Second exhaust pipe 15b Second exhaust pipe downstream end 16 Collecting pipe 17R Right muffler 17L Left muffler 18 Down Tube 25 Power transmission mechanism (belt)
50 exhaust device 56 connection port 58 to the collecting pipe in the first exhaust pipe 60a connection port 60a to the collecting pipe in the second exhaust pipe front end opening 60b rear end opening 61a upper opening 62a lower opening

Claims (6)

An exhaust device for a motorcycle equipped with a V-type engine having a rotation axis in the vehicle width direction,
An exhaust pipe led from the front cylinder and the rear cylinder to one side in the vehicle width direction of the vehicle body;
A muffler placed on the left and right sides of the car body,
A collecting pipe arranged on the one side;
An exhaust system for a motorcycle, wherein the exhaust pipe of both cylinders and the left and right mufflers are connected to the collecting pipe.   The exhaust system for a motorcycle according to claim 1, wherein the collecting pipe is located in front of the rear wheel and behind the engine.   The motorcycle according to claim 1 or 2, wherein the collecting pipe is located on a side opposite to a power transmission mechanism that transmits power of the V-type engine to a rear wheel with respect to a center line of a vehicle body extending in the front-rear direction. Exhaust system.   The connection port to the collecting pipe in the exhaust pipe from the front cylinder and the connecting port to the collecting pipe in the one side muffler are on the same straight line according to any one of claims 1 to 3. An exhaust system for a motorcycle that is arranged and opposed to each other.   5. The axial line of a downstream end connected to the collecting pipe in the exhaust pipe from the front cylinder and the collecting pipe in the exhaust pipe from the rear cylinder according to claim 1. An exhaust device for a motorcycle in which an axis of the downstream end intersects within the collecting pipe. Body frame,
A V-type engine having a rotation axis in the vehicle width direction of the vehicle body, having a front cylinder inclined forward and a rear cylinder inclined rearward at the upper part of the crankcase, and supported by the vehicle body frame;
A collecting pipe disposed on one side of the vehicle body frame in the vehicle width direction;
A first exhaust pipe connected to the front cylinder, led out to one side in the vehicle width direction of the vehicle body frame from the front cylinder, and extended rearward and connected to the collecting pipe;
A second exhaust pipe connected to the rear cylinder, led out from the rear cylinder to the one side, and extending rearward and connected to the collecting pipe;
A first muffler disposed on one side of the rear wheel in the vehicle width direction;
A second muffler disposed on the other side in the vehicle width direction of the rear wheel;
A first connecting pipe extending rearward from the collecting pipe and connected to the first muffler;
A second connecting pipe extending from the collecting pipe to the other side in the vehicle width direction and passing between the engine and a rear wheel and connected to the second muffler;
The collecting pipe is a motorcycle having four openings to which the first exhaust pipe, the second exhaust pipe, the first connection pipe and the second connection pipe are separately connected.

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