JPH0341048Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to an exhaust system for a motorcycle.

[Conventional technology]

Conventional motorcycles, for example,
As seen in the figure, the wheels are placed in the center of the vehicle axis,
A case containing a power transmission mechanism was provided on one side of the wheel, an engine was provided in front of the case, and an exhaust system consisting of an exhaust pipe and a muffler was provided on the opposite side of the wheel from the case.

[Problem that the invention attempts to solve]

Therefore, if the length of the exhaust pipe is long, the support member for the muffler must be provided on the side of the wheel, which not only makes it difficult to reduce the overall weight of the vehicle, but also particularly in the case of cantilevered wheels, Therefore, there was a problem in that the wheels could not be quickly and easily attached or detached.

The present invention was developed in view of the above-mentioned conventional examples, and its purpose is to provide an exhaust system for a motorcycle that can increase the length of the exhaust pipe while reducing the weight of the vehicle and speeding up the attachment and detachment of wheels. It's about doing.

[Means for solving problems]

The present invention is an exhaust system for a motorcycle equipped with a unit swing type power unit in which the engine and the power transmission case are installed so as to swing together with respect to the vehicle body, and the wheels are cantilevered on the side of the power transmission case. At the same time, the starting end of the exhaust pipe connected to the engine is pulled out to the side opposite to the power transmission case, and the middle part of the exhaust pipe is bent and passed between the wheels and the engine and pulled out to the power transmission case side. It is characterized by having its rear end supported by a power transmission case.

[Effect]

With the present invention configured in this way, by installing the exhaust pipe on the power transmission case side and passing the middle part to the opposite side, it is possible to avoid blocking the mounting and dismounting side of the cantilever wheel, making it possible to attach and detach the wheel. becomes faster,
In addition, since the length of the exhaust pipe can be set to an appropriate length, engine performance can be further improved.
Furthermore, since the support member for the muffler can be provided from the power unit side, the support structure can be simplified and reduced in weight.

〔Example〕

An embodiment of an exhaust system for a motorcycle according to the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 to 4, the motorcycle of this embodiment is roughly divided into a vehicle body 1, a rear wheel drive power unit 10, an outer shell 20, a relatively large storage compartment 30, and a rear wheel shock absorber. device 40 and exhaust device 50
, an air cooling means 60 , and a functional component 70 .

First, the vehicle body 1 includes a frame 2 which is divided into left and right sides of a center axis Q that is orthogonal to the vehicle center line P and defines the center in the vehicle width direction, and which extends along the vehicle center line P.
, a seat rail 4 for holding a seat 9 whose intermediate portion is supported by a rear stay 3 behind it, and a front fork 5 rotatably attached to a head pipe 5A on the front side of the frame 2. It is formed of a rear wheel 7 that is swingably mounted together with a front wheel 6 and a power unit 10 (details of which will be described later), and a handle 8. The power unit 10 is of a unit swing type in which each part swings together, and includes an engine 11 and a transmission mechanism for transmitting power to the rear wheels 7, and the overall shape is aligned with the center line of the vehicle as shown in FIG. P
From the engine 11 arranged around the rear wheel 7
Power transmission case 1 disposed facing one side of
6 and a rear wheel 7 connected to the power transmission case 16 via an axle are integrally arranged. Since the rear wheel 7 is uniaxially supported by the power unit 10, it can be easily attached and detached from the other side of the vehicle body center line P (the lower side in FIG. 2). Therefore, it is not necessary to provide a bracket for supporting the rear wheel 7 on the other side, which is also beneficial in reducing the weight of the entire vehicle body 1.

Here, the engine 11 is arranged with the head (plug 13 side) of the cylinder 12 inclined toward the front side of the vehicle body 1, and the crankcase 14
The left and right brackets 17 project from the frame 2 via lower locking pieces 14B, respectively, and are swingably supported by pivots 14C. In other words, pivot 14
C constitutes the center of swing of the entire power unit 10 with respect to the frame 2. By tilting the engine 11 substantially horizontally in this manner, a space 45 extending vertically is positively provided between the power unit 10 and the seat rail 4 serving as the upper part of the vehicle body. This space 45 has a sufficient extent in the width direction of the vehicle body 1 (see FIG. 2) centering on the central axis Q. In addition, 15 is an alternating current generator (ACG)
It is.

The rear wheel shock absorber 40 includes an upper locking piece 42, a lower locking piece 43, an upper locking piece 42, and a lower locking piece 43.
The upper locking piece 42 (other end side) is attached to the seat rail 4, which is the upper part of the vehicle body, and the lower locking piece 4
3 (one end side) is attached to the upper locking piece 14A of the crankcase 14 (power unit 10). In this embodiment, as shown in FIG. 4, the central axis R of the shock absorber 41 is aligned with the vehicle body center line P. Therefore, when the rear wheel 7 swings, it is possible to avoid bending moment or torsion moment being generated in the swing arm 17 and the power unit 10. In this sense, the spring axis only needs to be able to eliminate or reduce its torsional moment, so the axis R
It is understood that it is not necessary to completely match the .

In other words, the rear wheel shock absorber 40 moves the spring axis of the shock absorber 41, one end of which is locked to the crankcase 14 (power unit 10), within the vertical space 45 without using a link mechanism for changing the direction. Axis line R
(vehicle body center) or aligned with the axis (R'...near the vehicle body center) that is slightly offset in the vehicle width direction, and is suspended from the upper side of the vehicle body 1 to prevent the generation of moments. -ing

Now, the exhaust device 50, which is a characteristic technical feature of the present invention, is formed from a chamber 51 and a muffler 56. As shown in FIGS. 1 and 2, the chamber 51 has a starting end 52 connected to the engine 11, an intermediate section 53 whose cross-sectional shape is gradually enlarged to form an expansion section, and a terminal end 54 to which a muffler 56 is attached. It is integrally formed, and has a shape in which an intermediate portion 53 intersects the vehicle body center line P in the vehicle width direction, and a terminal portion 54 is positioned from one side to the other side (upper side in Fig. 2). . The muffler 56 is supported by the power unit 10 via the bracket 18. With this configuration, the pipe length can be made long, and the supporting member of the exhaust system 50 and the chamber 51 are located on the right side of the wheel in FIG.
Since there is no need to provide a rear wheel 7, quick attachment and detachment of the rear wheel 7 can be ensured.

Furthermore, the storage compartment 30 and the fuel tank 35 are spaced apart from each other in the vertical direction of the vehicle body 1. In this embodiment, a large storage compartment 30 capable of accommodating a helmet 34 is provided on the upper side. The storage compartment 30 is the first
As shown in Fig. 3, case 3 opens upward.
1 and a lid 33 for plug inspection that opens and closes the opening 32 of this case 31.
It is supported by the frame 2 between the handle 8 and the handle 8. On the other hand, the fuel tank 35 is disposed on the lower side facing the storage compartment 30, and is supported by the frame 2 via the brackets 2A, 2A and the vibration isolating rubber 31A. The fuel tank 35 is effectively used as a reinforcing material for the frame 2. Among the accessories for the vehicle body 1, a large storage compartment 30 and a fuel tank 35 are included.
As shown in FIG. 3, they are arranged at regular intervals to form an air guide path 61 extending from the front to the rear of the vehicle body 1. This air guide path 61 collects air taken in from the air guide port 62 while driving through the air outlet 62.
This leads to 3. The reason why the engine 11 (cylinder 12) is arranged at an angle is to form the vertical space 45 and also to make the cylinder 12 face the exhaust port 63. Here, an air cooling means 60 is constituted by an air guide port 62 provided on the inlet side, an air guide path 61, and an air exhaust port 63 provided on the exit side.

That is, the wind cooling means 60 is intended to efficiently cool the engine 11 provided on the rear wheel 7 side by actively and effectively utilizing the air flow generated during the vehicle. Since it is desirable that the cross-sectional shape of the air guide passage 61 be as large as possible, the filler port 36 of the fuel tank 35 is attached to a slope that slopes laterally from the top surface of the tank, as shown in FIG. Therefore, it also helps reduce air resistance while driving.

The functional component 70 is provided using the remaining space based on the above configuration. A radiator 72 connected to the engine 11 by a water pipe 73 is provided near the air guide port 62, and an air cleaner 75 is provided at the rear of the case 31 and connected to the engine 11 via a carburetor 74. The headlight 71 is located below the front of the trunk lid 21 and is fixed to the cowl 27.

Next, the outer shell 20, which is provided from the viewpoint of appearance, safety, etc., is composed of a cowl 27 and a trunk lid 21. The cowl 27 is composed of a streamlined bent plate extending from the headlight 71 to the seat 9, and is provided with a functional opening/closing portion such as a fuel door 28. Further, a handle opening 24 is provided on the upper side of the cowl 27 below the trunk lid 21 so as not to interfere with the operation of the handle 8. On the other hand, for reasons of appearance as well as functional convenience, the trunk lid 21 is integrally formed with a front end 22 located in front of the handle 8 and a rear end 23 located near the seat 9. It is possible to completely cover the entire area.
In this embodiment, the front end side 22 is rotatably attached to a support shaft 26 attached to the vehicle body 1, and is configured so that it can be opened widely regardless of the orientation of the handle 8, as shown by the two-dot chain line in FIG. has been done. Note that 25 is a hole for viewing the meter M. Therefore, even large items such as the helmet 34 can be easily taken in and out, and auxiliary equipment such as the plug 13 can be easily inspected. Moreover, the articles stored in the storage compartment 30 can be completely protected from rain, mud, etc.

Therefore, in this embodiment, the starting end of the chamber 51 is pulled out from the opposite side of the power transmission case 16, and the middle part of the chamber 51 is bent toward the power transmission case 16 through the space between the rear wheel 7 and the engine 11. Since the structure is such that the end portion 54 of the chamber 51 and the muffler 56 are attached to the power transmission case 16 side, the length of the chamber 51 can be made sufficiently long and the engine performance can be further improved. Further, since there is no need to provide a support member for the muffler 56 on the other side, the weight of the vehicle can be reduced, and since the chamber 51 does not protrude significantly, the cantilevered rear wheel 7 can be quickly and easily attached and detached. be able to.

Further, since the chamber 51 is bent from one side to the other side so as to cross the vehicle body center line P in the vehicle width direction, a desired expansion portion can be provided in the intermediate portion 53 without increasing the vehicle body width. can.

Furthermore, since the exhaust system 50 has a starting end 52 connected to the engine 11 and a terminal end 54 connected to the power unit 10 containing the engine 11, even if the rear wheels 7 and the power unit 10 swing, the exhaust system 50 will not be subjected to excessive force. Maintenance and inspection can be reduced.

[Effect of idea]

As is clear from the above explanation, the present invention draws out the starting end of the exhaust pipe from the side opposite to the power transmission case, and bends the middle part toward the power transmission case side through between the wheels and the engine. Since it is supported by the power transmission case of the power unit, it has the excellent effect of being able to have a sufficient tube length, reducing the weight of the vehicle, and making it easier to attach and detach the rear wheels.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the exhaust system for a motorcycle according to the present invention, Fig. 2 is a plan view showing the main parts, and Fig. 3 is a cross section of the vehicle body based on the arrow line - in Fig. 1. This figure and FIG. 4 are front views based on the arrow line - in FIG. 1. 7... Rear wheel, 10... Power unit, 11...
...Engine, 16...Power transmission case, 50...
Exhaust device, 51...chamber, 52...starting end,
53... middle part, 54... terminal part, 56... silencer.

Claims (1)

[Scope of utility model registration request] In the exhaust system for a motorcycle equipped with a unit swing type power unit in which an engine and a power transmission case are installed so as to swing integrally with respect to the vehicle body, and wheels are cantilevered on the side of the power transmission case, Pulling out the starting end of the exhaust pipe connected to the engine to the side opposite to the power transmission case, and bending the middle part of the exhaust pipe to pass between the wheels and the engine and pulling it out to the power transmission case side,
An exhaust system for a motorcycle, characterized in that a rear end of an exhaust pipe is supported by a power transmission case.