JP2004345642A - Exhaust device for motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a tail pipe provided in a lower part to be easily seen from a cowling, providing a tube part of a silencer in the cowling and improving an appearance while securing capacity. <P>SOLUTION: In this motorcycle, a multi-cylinder engine 40 is disposed between front and rear wheels 32, 34, the silencer 70 connected to a plurality of exhaust pipes 60 from the engine is disposed under the engine, and both right and left sides of the silencer is covered with the cowling 100. The silencer is constituted of the longitudinally elongated blocked cylindrical tube part disposed under the engine, and a tail pipe 84 is provided to a gas outlet of the silencer in a right side of a vehicle to project out of the cowling. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an exhaust device for a motorcycle whose exhaust device is covered by a cowling.

A motorcycle in which an exhaust device is covered by a cowling is conventionally known (for example, see Patent Literature 1).
JP-A-62-96182

In the above prior art, the exhaust device (muffler or the like) is provided with a concave portion in the lower cowling, and the tail end of the exhaust muffler is connected to the concave portion.
In this prior art motorcycle exhaust device, the exhaust muffler itself can hardly be seen from the outside, so it is difficult to recognize that the muffler is arranged there.
Further, in a conventional exhaust device for a motorcycle, when a muffler of a multi-cylinder engine is assembled, a sufficient capacity of a silencer is required, and a device for an exhaust gas outlet from the silencer has been desired.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide an exhaust system for a motorcycle, in which a tail pipe provided at a lower portion is easily visible from a cowling, while a cylinder portion of a silencer is provided in a cowling to ensure a good appearance while securing a capacity.

  According to the first aspect of the present invention, there is provided an automatic engine in which a multi-cylinder engine is arranged between front and rear wheels, a silencer connected to a plurality of exhaust pipes from the engine is arranged below the engine, and left and right sides of the silencer are surrounded by cowlings. In the motorcycle, the silencer is constituted by a tubular tubular portion which is elongated and closed in front and rear of a lower portion of an engine, and a tail pipe is provided on a gas outlet of the silencer and on the right side of the vehicle body so as to protrude from the cowling. Features.

  The invention according to claim 2 is characterized in that, in claim 1, the tail pipe is located near a rear wheel.

  The invention according to Claim 3 is characterized in that, in Claim 1, a cover member is provided on a side portion of the engine, and the cowling is attached to the vehicle body at a position where the cover member is exposed to the side.

  According to a fourth aspect of the present invention, in the motorcycle according to the first aspect, the motorcycle includes a swing arm at a rear portion of a vehicle body frame, the swing arm includes a rear cushion substantially at the center of the vehicle body, and a rear portion of the silencer includes It is characterized by being extended to the vicinity of the cushion.

  In the invention according to claim 1, the silencer is constituted by a tubular portion which is elongated and closed in front and rear of the lower portion of the engine, and a tail pipe is projected from the cowling to the gas outlet of the silencer and to the right side of the vehicle body. The tail pipe provided in the lower part of the vehicle is easy to see from the cowling and is located on the right side of the vehicle body, while the cylinder part of the silencer is provided in the cowling and the capacity is secured and the appearance is improved, while the vehicle is installed. The footing at the time of stopping and the influence on the driver before riding are also suppressed.

  In the invention according to claim 2, since the tail pipe is located near the rear wheel, exhaust noise is generated at a low position of the rear wheel, and the exhaust noise is shielded or mitigated by rotation of the rear wheel, or traveling. There is an advantage that the effect of being able to buffer and attenuate the noise and the rotation noise of the rear wheel can be expected.

  In the invention according to claim 3, the cover member is provided on the side of the engine, and the cowling is attached to the vehicle body at a position where the cover member is exposed to the side. You can produce an intermediate design.

  In the invention according to claim 4, the motorcycle includes a swing arm at a rear portion of the vehicle body frame, the swing arm includes a rear cushion substantially at the center of the vehicle body, and a rear portion of the silencer extends to near the rear cushion. , The front and back length of the silencer can be further secured, the width of the silencer can be reduced, and the cowling can be reduced, which contributes to a lighter-looking design. There is an advantage that it becomes.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is a side view of a motorcycle employing a cowling structure according to the present invention, and shows an appearance of a motorcycle 10.
The motorcycle 10 includes a front wheel 32 attached to a front portion of a body frame 20 via a front fork 31, a rear wheel 34 attached to a rear portion of the body frame 20 via a swing arm 33, and a lower longitudinal center portion of the body frame 20. And an air cleaner 53, a fuel tank 55, and a seat 56 mounted on the upper portion of the longitudinal center of the body frame 20.

  The present invention is characterized in that an in-line four-cylinder engine 40 is arranged between the front and rear wheels 32 and 34, and a silencer 70 is arranged below the engine 40. The silencer 70 is attached to the vehicle body frame 20 or the engine 40.

  Also, the cowling 100 of the motorcycle 10 includes a front cowl 101 covering an upper part of a front part of the vehicle body, left and right middle cowls 111 (only the right part is shown in this figure, the same applies hereinafter) covering a middle part of the front part of the vehicle body, and a lower part of the vehicle body. The rear cowl 121 covers the side surface of the silencer 70, and the rear cowl 131 surrounds the rear part of the vehicle body.

  The front cowl 101, the left and right middle cowls 111, and the left and right lower cowls 121 are splitably connected to each other by screws. More specifically, the cowling 100 allows the upper front part of the left and right middle cowls (front cowl) 111 to be able to be divided with respect to the lower part of the front cowl 101, and at the front position of the silencer 70, the lower rear end part of the middle cowl 111. In contrast, the front end of a lower cowl (rear cowl) 121 can be divided.

The front cowl 101 has a windscreen 102 at an upper part and a pair of left and right air intake ports 103 at a front part.
A recess 112 is formed at the lower rear end of the middle cowl (front cowl) 111 toward the center of the vehicle body, and a front opening 122 is formed at the front end of the lower cowl (rear cowl) 121. A large air guide port 123 for cooling the silencer 70 can be formed by combining the recess 112 with the recess 112.

  Further, this figure shows that the rear fender 140 disposed below the rear cowl 131 is attached to the swing arm 33. According to the present invention, the lower edge 132 of the rear cowl 131 is inclined substantially linearly rearward and upward, and the upper surface 141 of the rear fender 140 is inclined substantially linearly upward and rearward so as to be parallel to the lower edge 132 of the rear cowl 131. It is characterized by.

In the drawing, 47 is an engine crankshaft, 48 is a cover member (crankshaft cover), 91 is a handle, 92 is a mirror, 93 is a headlamp, 94 is a turn signal, 95 is a front fender, 96 is a rear cushion unit, and 97 is This is a cushion link. The rear portion of the silencer 70 extends to the vicinity of the cushion link 97.
The cover member 48 on the side of the engine is exposed on the side of the cowling 100 between the middle cowl 111 and the lower cowl 121, as is apparent from FIGS.

FIG. 2 is a perspective view of a main part of an intake / exhaust system structure mounted on a cowling structure of a motorcycle according to the present invention.
An intake system 51 of the motorcycle 10 includes a pair of left and right air intake ports 103 provided on the front cowl 101 shown in FIG. 1 described above, and a pair of left and right air ducts (intake ducts) 52 extending rearward from the air intake ports 103. 52, and an air cleaner 53 connected to the ends of these air ducts 52,52. The air cleaner 53 is arranged between the pair of left and right main pipes 21 and 21 of the body frame 20. 22 is a head pipe.

The engine 40 is a four-cylinder engine in which four exhaust ports 41 to 44 are arranged in a single row on the left and right at an upper front part, and includes an oil pan 45 at a lower rear part.
An exhaust system (exhaust device) 58 of the motorcycle 10 is a device that exhausts exhaust gas through an exhaust pipe 60 extending from exhaust ports 41 to 44 of the engine 40 and a silencer 70 connected to the exhaust pipe 60.

  As the silencer 70, a type in which a gas outlet 74 is provided near the gas inlet 73 is employed. The silencer 70 is arranged below the engine 40 with the gas inlet 73 facing the rear wheel 34, and the exhaust pipe 60 is connected to the gas inlet 73 of the silencer 70 with the exhaust pipe 60 extended to the vicinity of the rear wheel 34. I made it.

Here, the four exhaust ports are referred to as a first exhaust port 41, a second exhaust port 42, a third exhaust port 43, and a fourth exhaust port 44 in this order from the left side of the vehicle body (right side in this figure) to the right side.
The exhaust pipe 60 includes four pipes (a first pipe 61, a second pipe 62, a third pipe 63, and a fourth pipe 64), and three collecting cylinders (a first collecting cylinder 65, a second collecting cylinder 66, and a third collecting pipe 66). Collecting cylinder 67).

  The first pipe 61 having one end connected to the first exhaust port 41 extends downward and to the right, and further extends rearward while passing rightward of the oil pan 45. Similarly, the second pipe 62 having one end connected to the second exhaust port 42 also extends to the lower right, and further extends rearward while passing through the right side of the oil pan 45. Then, the other end of the first pipe 61 and the other end of the second pipe 62 are connected to a first collecting cylinder 65 to be collected into one. The first collecting cylinder 65 extends rearward while passing the right side of the oil pan 45, and further extends leftward.

  On the other hand, the third pipe 63, one end of which is connected to the third exhaust port 43, extends to the lower left, and further extends rearward while passing through the left side of the oil pan 45. Similarly, the fourth pipe 64 having one end connected to the fourth exhaust port 44 also extends to the lower left, and then extends rearward while passing through the left side of the oil pan 45. Then, the other end of the third pipe 63 and the other end of the fourth pipe 64 are connected to the second collecting cylinder 66 to be collected into one. The second collecting cylinder 66 extends rearward while passing through the left side of the oil pan 45.

  Furthermore, the other end of the first collecting tube 65 and the other end of the second collecting tube 66 are connected to a third collecting tube 67 to be collected into one. In this manner, the four pipes 61 to 64 can be combined into one third collecting cylinder 67. Then, the third collecting cylinder 67 extends rearward and is connected to the gas inlet 73.

FIG. 3 is a sectional plan view of a silencer employed in the motorcycle cowling structure according to the present invention.
The silencer 70 includes a tubular tubular portion 71 that is elongated and closed in the front and rear, a gas inlet 73 and a gas outlet 74 provided at a rear end portion 72 of the tubular portion 71, and three expansion chambers in the tubular portion 71 in the longitudinal direction. It comprises a first partition plate 78 and a second partition plate 79 for partitioning into 75-77.

In this manner, the first expansion chamber 75, the second expansion chamber 76, and the third expansion chamber 77 can be provided in this order from the rear end 72 to the front (to the right in the drawing) from the rear end 72. The first expansion chamber 75 communicates with the gas inlet 73, the third expansion chamber 77 communicates with the first expansion chamber 75 via a first communication pipe 81, and the second expansion chamber 76 communicates with the third expansion chamber 77. The gas outlet 74 communicates with the second expansion chamber 76 via the third communication pipe 83, and the tail pipe 84 is connected to the gas outlet 74.
The tail pipe 84 protrudes from the rear right side of the lower cowl 121 of the cowling 100, as is apparent from FIG. The tail pipe 84 is located near the side of the rear wheel 34, as is apparent from FIG.
Exhaust sound can be attenuated by the expansion effect when the exhaust gas enters the first, second, and third expansion chambers 75 to 77.

  FIG. 4 is a front perspective view of the cowling showing the cowling structure of the motorcycle according to the present invention. As described above, 111 is a middle cowl as a front cowl, 112 is a recess of the middle cowl 111, and 121 is a rear cowl. A lower cowl as a side cowl, 122 is a front opening, 123 is a wind guide opening formed by a depression 111 and a whole opening 122, 124... (See FIG. 3).

FIG. 5 is a perspective view from the side of the cowling showing the cowling structure of the motorcycle according to the present invention.
That is, in the motorcycle cowling structure according to the present invention, the engine 40 is disposed between the front and rear wheels 32, 34 (see FIG. 1), the silencer 70 is disposed below the engine 40, and the left and right side surfaces of the silencer 70 Also, in the motorcycle 10 surrounded by the cowling 100, the cowling 100 can be divided at a position in front of the silencer 70, and a recess 112 is formed at the rear end of the middle cowl 111 (front cowl) toward the vehicle body center. A front opening 122 is formed at the front end of 121 (rear cowl), and by combining the front opening 122 with the recess 112, it can be said that a large air guide port 123 for cooling the silencer 70 is formed.

For example, using the traveling wind to cool the silencer 70 and the like of the motorcycle 10 (see FIG. 1) is preferable from the viewpoint of environmental protection because only the natural traveling wind is used. .
Therefore, the cowling 100 is formed so as to be able to be divided into the middle cowl 111 and the lower cowl 121 at a position forward of the silencer 70, a recess 112 is formed at the rear end of the middle cowl 111 toward the center of the vehicle body, and a front end of the lower cowl 121 is formed at the front end. An opening 122 is formed. Then, the recess 112 at the rear end of the middle cowl 111 and the front opening 122 of the lower cowl 121 are aligned to form the air guide port 123.

That is, by aligning the front opening 122 and the depression 112, for example, the middle cowl 111 can be covered with the lower cowl 121, and the inside can be made hard to see. As a result, a large air guide port 123 can be formed for cooling the silencer 70, and the silencer can be sufficiently cooled.
Further, a side portion of the crankshaft 47 of the engine 40 is covered with a crankshaft cover 48 (cover member), a flange portion 48a is formed around the cover member 48, and the crankshaft cover 48 and the flange portion 49 are collectively assembled. By exposing the cowling 100 (see FIG. 1), the area of the cowling 100 is reduced. As a result, by making the cowling 100 look small, a design with a light feeling can be produced.

FIG. 6 is a side view of a rear fender employing the motorcycle cowling structure according to the present invention. For example, by adding functions other than mudguards to the rear fender 140, the design of the motorcycle 10 can be improved. This is preferable because the design of the motorcycle can be made new.
Therefore, the rear fender 140 tilts the lower edge 132 of the rear cowl 131 almost linearly upward and rearward, and tilts the upper surface of the rear fender 140 almost linearly upward and rearward so as to be parallel to the lower edge 132 of the rear cowl 131. It indicates that. In the figure, 35 indicates a rear wheel axle, 36 indicates a pivot shaft, and 142 indicates a protrusion formed on the rear fender 140.

  That is, the rear fender structure of the motorcycle is such that the rear edge of the rear cowl 131 is substantially rearward and upward in the motorcycle 10 in which the rear portion of the vehicle body is surrounded by the rear cowl 131 and the rear fender 140 disposed below the rear cowl 131 is attached to the swing arm 33. It can be said that the rear fender 140 is inclined linearly, and is inclined substantially linearly rearward and upward so that the upper surface of the rear fender 140 is parallel to the lower edge 132 of the rear cowl 131.

  In the rear fender structure of the motorcycle, the upper surface of the rear fender 140 is inclined substantially linearly rearward and upward so as to be parallel to the lower edge 132 of the rear cowl 131. The traveling wind flow can be improved. As a result, a downforce is generated in the rear fender 140, and the effect of a rear spoiler that holds down the rear wheel 34 can be added. Further, by adding the effect of the rear spoiler to the design of the motorcycle 10, the design of the motorcycle 10 can be improved.

  Further, by providing the rear fender 140 with the protruding portion 142 protruding rearward from the rear wheel axle 35, it is possible to improve the external appearance design.

  The swing arm 33 is provided with a rear cushion unit 96 substantially at the center of the vehicle body and between the vehicle body frame 20 (see FIG. 1), and the upper end of the rear cushion unit 96 is coupled to the upper part of the swing arm 33. By connecting the upper end of 96 to the lower part of the vehicle body frame 20, for example, a space between the rear wheel 34 and the rear cowl 131 can be opened. As a result, traveling wind can be drawn around the rear fender 140, and the rear fender 140 can exhibit the effect of the rear spoiler.

  Further, by opening the side of the rear fender 140, the running wind can be drawn into the side of the rear fender 140, and the rear fender 140 can exhibit the effect of the rear spoiler.

  In the embodiment, as shown in FIG. 5, the air inlet 123 is formed by aligning the front opening 122 and the recess 112, but the recess 112 extends to the rear of the vehicle body, and the air inlet is formed in a duct shape. It may be one that has been made. The cooling efficiency of the silencer can be improved by forming the air guide opening into a duct shape.

  The exhaust device for a motorcycle according to the present invention is suitable for use in a motorcycle equipped with a multi-cylinder engine.

1 is a side view of a motorcycle including an exhaust device according to the present invention. It is a principal part perspective view of the intake / exhaust system structure which comprises the exhaust apparatus which concerns on this invention. It is a top sectional view of the silencer of the exhaust device concerning the present invention. It is a perspective view from the front of the cowling including the exhaust device of the motorcycle according to the present invention. It is a perspective view from the side of the cowling of the motorcycle according to the present invention. FIG. 2 is a side view of a rear portion of the motorcycle according to the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 32 ... Front wheel, 33 ... Rear swing arm, 34 ... Rear wheel, 40 ... Engine, 48 ... Cover member (crankshaft cover), 48a ... Flange part, 60 ... Exhaust pipe, 70 ... Silencer, 84 ... Tail pipe, 96: rear cushion unit, 100: cowling, 111: front cowl (middle cowl), 112: hollow, 121: rear cowl (low cowl).

Claims (4)

In a motorcycle in which a multi-cylinder engine is arranged between the front and rear wheels, a silencer connected to a plurality of exhaust pipes from this engine is arranged below the engine, and a left and right side surface of the silencer is surrounded by a cowling,
The silencer is constituted by a tubular portion that is elongated and closed at the front and rear of the lower part of the engine, and a tail pipe is provided at the gas outlet of the silencer and on the right side of the vehicle body so as to protrude from the cowling. Exhaust system for motorcycles.   The exhaust device for a motorcycle according to claim 1, wherein the tail pipe is located near a rear wheel.   The exhaust device for a motorcycle according to claim 1, wherein a cover member is provided on a side portion of the engine, and the cowling is attached to the vehicle body at a position where the cover member is exposed to the side.   The motorcycle includes a swing arm at a rear portion of a vehicle body frame, the swing arm includes a rear cushion substantially at the center of the vehicle body, and a rear portion of the silencer extends to a vicinity of the rear cushion. Item 2. An exhaust device for a motorcycle according to Item 1.

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