JP4546004B2 - Motorcycle exhaust system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust device for a motorcycle in which a V-type engine is mounted substantially in the center of a vehicle body, the lower part of the engine is covered with a lower cowl, and the rear lower part of the vehicle body is covered with a rear cowl.
[0002]
[Prior art]
Known as exhaust systems for motorcycles are, for example, (1) Utility Model Registration No. 2513425 “Exhaust System Cooling Device for Motorcycles” and (2) Japanese Utility Model Publication No. 63-6417 “Exhaust System for Engines”. .
According to FIG. 2 and FIG. 3 of the publication, the above-mentioned (1) is formed with bulging portions 3 and 3 on the left and right sides of the rear cowl Cr, and air inlets in front of these bulging portions 3 and 3, respectively. 5 and 5 are formed, air discharge ports 6 and 6 are formed behind the bulging portions 3 and 3, respectively, and the mufflers 1 and 1 of the exhaust system Ex are accommodated in the bulging portions 3 and 3, respectively. The tail pipes 2 and 2 of the exhaust system Ex are faced from 6 and 6.
[0003]
According to FIG. 1 and FIG. 2 of the publication, the above-mentioned (2) is connected to one end of the exhaust pipe 14 to the cylinder 8 and the exhaust chamber 15 and the silencer 16 are connected to the other end of the exhaust pipe 14 in this order. The exhaust device 13 is connected, and the exhaust pipe 14, the exhaust chamber 15 and the silencer 16 are wound in a circular arc shape along the lower surface of the crankcase of the engine 6.
[0004]
[Problems to be solved by the invention]
However, in the above-described (1) exhaust system cooling apparatus for motorcycles, the bulging portions 3 and 3 are formed on the left and right sides of the rear cowl Cr, and the exhaust systems Ex mufflers 1 and 1 are respectively attached to the bulging portions 3 and 3. Although it is possible to improve the design of the motorcycle by storing it, there are cases in which it is desired to make the length of the exhaust system Ex (for example, the length of the exhaust pipe) longer.
In the engine exhaust system of (2), the exhaust pipe 14, the expansion chamber 15 and the silencer 16 are wound in an arc shape, so that the exhaust system can be sufficiently long, but the exhaust pipe 14, the expansion chamber. 15 and the silencer 16 are exposed, which may be undesirable in terms of design. Also, the air resistance of the motorcycle may increase.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust device for a motorcycle capable of obtaining an optimal exhaust device length and obtaining a good rectifying effect.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an exhaust system for a motorcycle according to claim 1 covers a V-type engine mounted substantially in the center of the vehicle body with a front cylinder disposed at the front and a rear cylinder disposed at the rear, and a lower portion of the engine. and a lower cowl, which has a rear cowl for covering a vehicle body upper portion rearward, the first muffler is disposed in the lower cowl, and an exhaust system for a motorcycle in which the second muffler is disposed in a rear cowl, the previous engine The exhaust pipe connected to the cylinder is wound in an arc shape around the first silencer in the lower cowl and then connected to the first silencer, and the exhaust pipe connected to the rear cylinder of the engine is placed in the rear cowl. It is characterized by being connected to a second silencer after being wound in an arc shape.
[0007]
The exhaust pipe connected to the front cylinder of the engine is wound in an arc shape with a lower cowl and then connected to the first silencer , and the exhaust pipe connected to the rear cylinder of the engine is surrounded by the rear cowl around the first silencer. In this way , the optimal length of the exhaust pipe is ensured by connecting it to the second silencer after being wound in an arc shape.
[0008]
By disposing the first silencer in the lower cowl, the first silencer can be covered with the lower cowl, and by arranging the second silencer in the rear cowl, the second silencer is covered with the rear cowl. Therefore, it is possible to realize a delicate motorcycle design.
By disposing the first silencer in the lower cowl and the second silencer in the rear cowl, the air resistance of the motorcycle is reduced.
The second aspect of the present invention provides a V-type engine mounted substantially in the center of the vehicle body with a front cylinder disposed at the front and a rear cylinder disposed at the rear, a lower cowl covering the lower portion of the engine, and a seat disposed at the upper rear of the engine. An exhaust system for a motorcycle having a rear cowl covering the upper rear of the vehicle body, a first silencer disposed in the lower cowl, and a second silencer disposed in the rear cowl, which is connected to a front cylinder of the engine The exhaust pipe to be connected is wound in an arc shape in the lower cowl and then connected to the first silencer, and the exhaust pipe connected to the rear cylinder of the engine is wound in the arc shape so as to stand up behind the seat in the rear cowl and then the second It is connected to a silencer.
According to a third aspect of the present invention, the V-type engine has a front cylinder of three cylinders in the front and a rear cylinder of two cylinders in the rear.
According to a fourth aspect of the present invention, the exhaust pipe connected to the first silencer is gathered in the lower cowl.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a motorcycle equipped with an exhaust device according to the present invention. The motorcycle 10 includes a front wheel 14 attached to a front portion of a body frame 12 via a front fork 13 and a rear portion of the body frame 12. A rear wheel 15 attached via a swing arm 16; an engine 17 attached to a lower longitudinal center of the body frame 12; an air cleaner 19, a fuel tank 21 and a seat 22 attached to an upper longitudinal center of the body frame 12. This is a full cowl type motorcycle in which the vehicle body 11 is covered with a cowling 30.
[0010]
The engine 17 is mounted substantially in the center of the vehicle body 11 with the front cylinder 24 positioned forward and the rear cylinder 25 positioned rearward. The front cylinder 24 has three cylinders, This is a V-type engine having two cylinders. Reference numeral 26 denotes a crankshaft of the engine 17, which indicates that the engine 17 is mounted horizontally on the vehicle body frame 12.
Further, an exhaust device 60 (hereinafter abbreviated as “exhaust device 60”) of a motorcycle according to the present invention is a V-type five-cylinder engine so that the front three cylinders are located forward and the rear two cylinders are located rearward in a side view. The exhaust device.
[0011]
The cowling 30 covers a front cowl 31 covering the front upper part of the vehicle body 11, left and right middle cowls 32, 32 (32 on the back side not shown) covering the front middle part of the vehicle body 11, a lower part of the vehicle body and the exhaust device 60. The left and right lower cowls 33 and 33 (the rear 33 is not shown) and a rear cowl 34 that surrounds the rear portion of the vehicle body 11 and the exhaust device 60.
[0012]
The front cowl 31, the left and right middle cowls 32, 32 and the left and right lower cowls 33, 33 are detachably coupled by screwing, that is, the cowling 30 has left and right middle cowls with respect to the lower portion of the front cowl 31. The upper front portions of 32 and 32 are detachably attached, and the front end portions of the lower cowls 33 and 33 are detachably attached to the lower rear end portions of the middle cowls 32 and 32.
[0013]
The front cowl 31 includes a wind screen 35 at the top and a pair of left and right air suction ports 36, 36 (the rear side 36 is not shown) at the front.
The middle cowl 32 is formed by forming a depression 37 at the lower rear end toward the center of the vehicle body. The lower cowl forms a front opening 38 at the front end, and the front opening 38 and the depression 37 are combined. An air guide port 39 for cooling the exhaust device 60 is formed.
[0014]
In the figure, 44 is a head pipe, 45 is a main pipe of the vehicle body frame 12, 46 is a front fender, 47 is a rear fender, 48 is a handle, 49 is a mirror, 51 is a headlamp, and 52 is a blinker.
[0015]
FIG. 2 is a perspective view of a main part of a motorcycle equipped with the exhaust device according to the present invention. The exhaust device 60 includes a first exhaust system unit 61 that exhausts exhaust gas from the front cylinder 24 (see FIG. 1) of the engine 17. The second exhaust system unit 71 discharges exhaust gas from the rear cylinder 25 (see FIG. 1) of the engine 17.
[0016]
The first exhaust system unit 61 includes a front exhaust pipe 62 as an exhaust pipe connected to the front cylinder 24 (see FIG. 1), a first silencer 63 connected to the front exhaust pipe 62, and the first silencer. And a first tail pipe 64 connected to the vessel 63.
The front exhaust pipe 62 includes a front left pipe 65, a front center pipe 66, and a front right pipe 67 connected to the front cylinder 24, and a front collecting pipe 68 that collects these pipes 65, 66, 67. The pipe 68 is wound in an arc shape in the lower cowl 33 and then connected to the first silencer 63.
[0017]
The second exhaust system unit 71 includes a rear exhaust pipe 72 as an exhaust pipe connected to the rear cylinder 25 (see FIG. 1), a second silencer 73 connected to the rear exhaust pipe 72, and the second silencer. And a second tail pipe 74 connected to the vessel 73.
The rear exhaust pipe 72 includes a rear left pipe 75 and a rear right pipe 76 connected to the rear cylinder 25, and a rear collecting pipe 78 that collects these pipes 75 and 76. The rear collecting pipe 78 is disposed in the rear cowl 34. After being wound in an arc shape, it is connected to the second silencer 73.
[0018]
FIG. 3 is a perspective view of an exhaust device for a motorcycle according to the present invention. The exhaust device 60 is arranged in the approximate center of the vehicle body 11 with the front cylinder 24 (see FIG. 1) disposed in the front and the rear cylinder disposed in the rear. arranged and equipped with V-type engine 17 (see FIG. 1), and a lower cowl 33 covering the lower the engine 17, which has a rear cowl 34 covering the vehicle body 11 over the portion rearward, the first muffler 63 in a lower cowl 34 In addition, in the motorcycle 10 (see FIG. 1) in which the second silencer 73 is disposed in the rear cowl 34, a front exhaust pipe 62 connected to the front cylinder 24 of the engine 17 is wound in an arc shape in the lower cowl 33. A rear exhaust pipe 72 connected to the first silencer 63 and connected to the rear cylinder 25 (see FIG. 1) of the engine 17 is wound in an arc shape in the rear cowl 34 and then connected to the second silencer 73. It can be said that those were.
[0019]
A front exhaust pipe 62 connected to the front cylinder 24 of the engine 17 (see FIG. 1) is wound in an arc shape by the lower cowl 33 and then connected to the first silencer 63 and connected to the rear cylinder 25 of the engine 17. 72 is wound in a circular arc shape in the rear cowl 34 and then connected to the second silencer 73, so that the optimal lengths of the front and rear exhaust pipes 62 and 72 are secured. As a result, pressure interference of exhaust gas can be prevented and exhaust efficiency can be improved. With this, the output of the engine 17 can be improved.
[0020]
FIG. 4 is a perspective view of a motorcycle equipped with an exhaust device according to the present invention. In the exhaust device 60, the first silencer 63 is disposed in the lower cowl 33, so that the first silencer 63 is replaced with the lower cowl 33. In addition, the second silencer 73 can be covered with the rear cowl 34 by disposing the second silencer 73 in the rear cowl 34, so that the design of the fertile motorcycle 10 can be realized. be able to.
Further, by arranging the first silencer 63 in the lower cowl 33 and the second silencer 73 in the rear cowl 34, the air resistance of the motorcycle 10 can be reduced. As a result, the rectifying effect can be improved.
[0021]
Next, the operation of the exhaust device 60 described above will be described.
FIG. 5 is a diagram for explaining the operation of the exhaust device for a motorcycle according to the present invention, and shows a connection state of the exhaust device 60 to the engine 13 (see FIG. 1). Here, (1) to (5) represent the cylinder numbers of the engine 13, (1) is the first cylinder, and (5) is the fifth cylinder.
That is, the front left pipe 65 is connected to the first cylinder, the front center pipe 66 is connected to the third cylinder, the front right pipe 67 is connected to the fifth cylinder, the rear left pipe 75 is connected to the second cylinder, The rear right pipe 76 is connected to the fourth cylinder.
[0022]
Further, an exhaust pipe connected to the front cylinder 24 (see FIG. 1) of the engine 17 is wound in an arc shape by the lower cowl 33 and then connected to the first silencer 63, and connected to the rear cylinder 25 of the engine 17 (see FIG. 1). The exhaust pipe to be connected is wound in an arc shape in the rear cowl 34 and then connected to the second silencer 73, thereby ensuring the optimal length of the front and rear exhaust pipes 62 and 72. As a result, it is possible to prevent pressure interference caused by the exhaust gas between the pipes 65 to 67 and the pipes 75 and 76, and to improve the exhaust efficiency. With this, the output of the engine 17 can be improved.
[0023]
In the embodiment, as shown in FIG. 1, the exhaust device of the V-type 5-cylinder engine has been described. However, the engine is not limited to the 5-cylinder engine, and the number of cylinders is arbitrary. For example, the number of cylinders is It may be 2, 3, 4, 6 or 8.
In the embodiment, as shown in FIG. 3, the front exhaust pipe 62 and the rear exhaust pipe 72 are wound in an arc shape, but the present invention is not limited to this, and includes a spiral shape, a U shape, and a hairpin shape. That is, what is necessary is just to make the exhaust pipe into a loop shape in the lower cowl or the rear cowl.
[0024]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
In claim 1, the exhaust pipe connected to the front cylinder of the engine is wound in an arc shape so as to surround the periphery of the first silencer in the lower cowl, and then connected to the first silencer. Since the exhaust pipe to be connected is wound in an arc shape in the rear cowl and then connected to the second silencer, the optimum length of the exhaust pipe can be ensured. As a result, pressure interference of exhaust gas can be prevented and exhaust efficiency can be improved. With this, the output of the engine can be improved.
In addition, since the first silencer is disposed in the lower cowl, the first silencer can be covered with the lower cowl, and the second silencer can be disposed in the rear cowl so that the second silencer is disposed in the rear cowl. This makes it possible to realize a vivid motorcycle design.
Further, since the first silencer is disposed in the lower cowl and the second silencer is disposed in the rear cowl, the air resistance of the motorcycle can be reduced. As a result, a good rectifying effect can be obtained.
In claim 2, the exhaust pipe connected to the front cylinder of the engine is wound in an arc shape in the lower cowl and then connected to the first silencer, and the exhaust pipe connected to the rear cylinder of the engine is arranged in the rear cowl at the rear of the seat. After winding up in an arc shape to stand up, it was connected to the second silencer.
In claim 3, the V-type engine has a front cylinder of three cylinders at the front and a rear cylinder of two cylinders at the rear.
In claim 4, the exhaust pipe connected to the first silencer is assembled in the lower cowl.
[Brief description of the drawings]
FIG. 1 is a side view of a motorcycle equipped with an exhaust device according to the present invention. FIG. 2 is a perspective view of a main part of a motorcycle equipped with an exhaust device according to the invention. FIG. 3 is an exhaust of a motorcycle according to the invention. FIG. 4 is a perspective view of a motorcycle equipped with an exhaust device according to the present invention. FIG. 5 is an operation explanatory diagram of a motorcycle exhaust device according to the present invention.
DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Car body, 17 ... Engine, 24 ... Front cylinder, 25 ... Rear cylinder, 33 ... Lower cowl, 34 ... Rear cowl, 62, 72 ... Exhaust pipe (front / rear exhaust pipe), 63, 64 ... No. 1. Second silencer.

Claims (4)

A V-type engine mounted in a state of placing the front cylinder forward to place the rear cylinder behind the vehicle body substantially center, and a lower cowl covering the engine lower, which has a rear cowl for covering a vehicle body upper portion rearward, in the lower cowl the first muffler is disposed, an exhaust system for a motorcycle in which the second muffler is disposed in the rear cowl and the,
An exhaust pipe connected to the front cylinder of the engine in the lower cowl, connected to said first silencer after wound in an arc shape so as to surround the periphery of the first muffler, the cylinder after the engine An exhaust system for a motorcycle, wherein an exhaust pipe to be connected is wound in an arc shape in the rear cowl and then connected to the second silencer. A V-type engine mounted in the center of the vehicle body with a front cylinder in the front and a rear cylinder in the rear, a lower cowl that covers the lower part of the engine, a seat that is arranged at the upper rear of the engine, An exhaust system for a motorcycle having a rear cowl for covering, a first silencer disposed in the lower cowl, and a second silencer disposed in the rear cowl,
  An exhaust pipe connected to the front cylinder of the engine is wound in an arc shape in the lower cowl and then connected to the first silencer, and an exhaust pipe connected to the rear cylinder of the engine is connected to the rear cowl in the rear of the seat. An exhaust apparatus for a motorcycle, wherein the exhaust apparatus is connected to the second silencer after being wound in an arc shape so as to stand up. The exhaust system for a motorcycle according to claim 1 or 2, wherein the V-type engine has a front cylinder of three cylinders in front and a rear cylinder of two cylinders in the rear. The exhaust device for a motorcycle according to claim 1 or 2, wherein exhaust pipes connected to the first silencer are gathered in the lower cowl.

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