JPH0515596B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a component arrangement structure for a motorcycle.

(Prior Art) Conventionally, there is a motorcycle disclosed in Japanese Unexamined Patent Publication No. 16966/1983.

According to this, the vehicle body frame is composed of main pipes extending rearwardly downward from the steering shaft pipe, and a pair of left and right seat rails extending rearward from the front and rear midpoints of these main pipes.

Further, a fuel tank is disposed above each cylinder of the engine supported by the vehicle body frame. Furthermore, a carburetor and an air cleaner are connected to the rear of each cylinder, and a seat is mounted on the seat rail.

Furthermore, in the above configuration, there has conventionally been one in which a pair of left and right main pipes are provided and the engine is a parallel multi-cylinder engine.

(Problems to be Solved by the Invention) Incidentally, when the engine is a parallel multi-cylinder engine, it becomes heavy, so it is desirable to improve the rigidity of the vehicle body frame that supports it.

Therefore, it is possible to widen the distance between the left and right main pipes, but in this case, there will be wasted space between the left and right main pipes, and the left and right main pipes will interfere with the legs of the rider who is straddling the seat, making the ride uncomfortable. There is a risk that it will decrease.

In addition, to increase the capacity of the fuel tank,
It is conceivable to increase the width dimension, but if this is done simply, the balance of the shape with the main pipe may be lost and the appearance of the vehicle body may deteriorate.

Furthermore, since the air cleaner is box-shaped and difficult to maintain rigidity, it is desirable to sufficiently improve the support strength for the vehicle body frame.

Moreover, in the case of a multi-cylinder engine, the outside air inlet of the air cleaner is often not provided at the same position as viewed from each carburetor, so the outside air introduced into the air cleaner from the outside air inlet is connected to each carburetor. There is a risk that the flow will be biased toward one of the cylinders, and in this case, there is a risk that combustion will vary between cylinders and engine performance will be impaired.

(Objectives of the Invention) This invention has been made in view of the above circumstances, and has the following objectives.

First, the rigidity of the left and right main pipes is improved to ensure strong support for the engine, and
To effectively utilize the air between left and right main pipes and to prevent the riding comfort of a motorcycle from deteriorating.

Second, increase the capacity of the fuel tank while maintaining the appearance of the vehicle body.

Thirdly, the supporting strength of the air cleaner with respect to the vehicle body frame is improved, and the flow of outside air from the air cleaner toward each carburetor is prevented from being biased, thereby improving engine performance.

(Structure of the Invention) A feature of the present invention for achieving the above object is that the vehicle body frame has a pair of left and right main pipes, and a pair of left and right seats extending rearward from the front and rear midpoints of these main pipes. The engine is a parallel multi-cylinder engine supported by the vehicle body frame, and a fuel tank is arranged above each cylinder, and a carburetor and an air cleaner are arranged in series behind each cylinder. In the component arrangement structure of the motorcycle in which the seat is mounted on the seat rail, the left and right main pipes are formed almost linearly in side view, and the front parts of the left and right main pipes are connected between the front parts of the left and right main pipes. The cylinder and the carburetor are arranged between the front parts of these left and right main pipes, wider than the rear parts, and
A fuel tank is disposed above the front part of the left and right main pipes, and the air cleaner is disposed between the left and right seat rails, and the left and right seat rails cross approximately the vertical center of the air cleaner when viewed from the side. In this way, the air cleaner is supported by the left and right seat rails, and the air cleaner is connected to the carburetor above the seat rail, while an outside air inlet is formed in the air cleaner below the seat rail. That's what I did.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Reference numeral 1 designates a motorcycle, and its body frame 2 includes a main frame 3 and a sub-frame 4 supported at the rear of the main frame 3.

The main frame 3 includes a pair of left and right main pipes 6, 6 extending rearward downward from the steering shaft tube 8 and linearly in side view, and extending forward and downward from the rear ends of these left and right main pipes 6, 6. It has a pair of left and right rear arm brackets 5, 5 extending toward each other, and a down tube 7 connecting the front ends of the main pipes 6, 6 and the lower ends of the rear arm brackets 5, 5.

A front wheel is supported on the steering shaft tube 8, and a rear wheel 10 is supported on the rear arm brackets 5, 5 via a rear arm 9.

Further, a parallel multi-cylinder engine 11 is provided within the frame of the main frame 3 and is supported by the main frame 3.

Further, a fuel tank 12 is arranged above each cylinder 11a of the engine 11, and this fuel tank 12 is attached to the upper part of the main frame 3.

The sub-frame 4 has a pair of left and right seat rails 13, 13, and the front end of each seat rail 13 is removably fixed to the front and rear midway portions of the main pipe 6 via bolts 6a. Further, the sub-frame 4 has a pair of left and right seat pillars 14, 14,
Each seat pillar 14 is installed between the seat rail 13 and each rear end of the main pipe 6. In this case, the front end of the seat pillar 14 is pivotally supported to the rear end of the main pipe 6 via a pivot shaft 6b, and by removing the pivot shaft 6b, the front end of the seat pillar 14 can be attached to and detached from the rear end of the main pipe 6. It is said that A seat 16 is mounted on the seat rails 13, 13.

A carburetor 17 and an air cleaner 18 are connected to the rear of each cylinder 11a of the engine 11.

In particular, in FIG. 2, the left and right main pipes 6,
The space between the front parts of the left and right main pipes 6 is wider than the space between the rear parts of the left and right main pipes 6.

Further, the cylinders 11a and the carburetor 17 are disposed between the front portions of the left and right main pipes 6, 6, and the fuel tank 12 is disposed above the front portions of the left and right main pipes 6, 6. ing.

On the other hand, the air cleaner 18 is disposed between the left and right seat rails 13, 13, and the left and right seat rails 13, 13 cross approximately the upper and lower central portions of the air cleaner 18 when viewed from the side.

The air cleaner 18 is connected to a first bracket 2 installed between both seat rails 13, 13.
1, and is detachably supported on the seat rail 13 by a second bracket 22 and a bolt 20 provided on each seat rail 13, respectively.

The air cleaner 18 is the cleaner case 1.
The width direction dimension of the cleaner case 9 is formed to be larger than the dimension between the left and right seat rails 13, 13, and a recess 19a is formed on each outer surface of the cleaner case 19 so as to bypass the seat rail 13. A pair of left and right outside air introduction ports 19b are formed at the rear lower portion of the cleaner case 19. On the other hand, a plurality of exhaust pipes 19c are provided in the front upper part of the cleaner case 19, corresponding to each carburetor 17. Each of these exhaust pipes 19c is formed of an elastic member such as rubber,
An intake pipe 17a of the carburetor 17 is inserted into this exhaust pipe 19c.
are removably fitted, and these vaporizers 17
The intake pipe 17a of the cleaner case 19 and the exhaust pipe 1 of the cleaner case 19
9c and are connected to each other by a band 23.

The exhaust pipe 19c is provided above the seat rail 13, and the outside air inlet 19b is provided below the seat rail 13.

When the engine 11 is in operation, outside air is introduced into the air cleaner 18 through the outside air inlet 19b, where the outside air is filtered, and then passes through the exhaust pipe 19c and the carburetor 17 to the engine 11. is inhaled.

Next, in the above configuration, the procedure for removing the air cleaner 18 from the vehicle body frame 2 will be explained. First, by removing the bolts 6a, the connection of the seat rail 13 to the main pipe 6 is released, and the band 23 is loosened. . Next, the subframe 4 is rotated downward about the pivot shaft 6b (as shown by the dashed line in FIG. 1). This downward rotation of the sub frame 4 causes the exhaust pipe 19c of the cleaner case 19 to come off from the intake pipe 17a of the carburetor 17, and at the same time, the space between the front end of the seat rail 13 and the main pipe 6 is opened. Then, through this opening, air cleaner 1
8 is removed from the seat rail 13. on the other hand,
In order to attach this air cleaner 18 to the vehicle body frame 2, the above-described procedure may be reversed.

(Effects of the Invention) According to the present invention, the left and right main pipes are formed almost linearly in side view, and the front parts of the left and right main pipes are made wider than the rear parts of the left and right main pipes. Because each cylinder of the multi-cylinder engine and the carburetor connected to it are placed between the front parts of the left and right main pipes, the rigidity of the left and right main pipes is improved and the engine is strongly supported, and the width of the engine is increased. The space between the front parts of the left and right main pipes is effectively used for arranging the cylinder and the carburetor.

In addition, as mentioned above, the space between the rear parts of the left and right main pipes is kept narrow, and the seat is attached to the seat rail that extends rearward from the front and rear midpoints of the left and right main pipes, so the rider who straddles this seat is The rear portions of the left and right main pipes are prevented from interfering with both legs. Therefore, riding comfort on the motorcycle can be maintained good.

In addition, in the above case, the fuel tank is arranged above the cylinder, and this fuel tank is located above each front part of the left and right main pipes, which are widened. The width of the fuel tank can be increased according to the size of the fuel tank.

Therefore, the capacity of the fuel tank can be increased while maintaining the shape balance with the front portions of the left and right main pipes, and the appearance of the vehicle body can be maintained good.

Furthermore, an air cleaner is disposed between the left and right seat rails, and the left and right seat rails cross approximately the upper and lower center of the air cleaner when viewed from the side, and the air cleaner is supported by the left and right seat rails. Although the air cleaner is box-shaped and difficult to maintain rigidity, the upper and lower central portions of both left and right ends of the air cleaner can be supported by the seat rails, ensuring sufficient support strength for the air cleaner.

Furthermore, while the air cleaner is connected to the carburetor above the seat rail, an outside air inlet is formed in the air cleaner below the seat rail, so the outside air taken in from this outside air inlet is transferred to the seat rail. After flowing for a sufficiently long time in the air cleaner from the lower side to the upper side, it heads to the carburetor.

Therefore, even if the outside air inlet ports are not located at the same positions as viewed from each carburetor, the outside air will flow through the air cleaner for a long enough time from the outside air inlet port to each carburetor, and if any one of the carburetors This prevents the current from drifting away from the current.

As a result, variations in combustion within each cylinder are prevented, which is beneficial for engine performance.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, in which Fig. 1 is an overall side view of the motorcycle, Fig. 2 is a plan view thereof, Fig. 3 is a view taken along the - line in Fig. 1, and Fig. 4 is a view taken from Fig. 1. of-
It is a partial sectional view taken along the line. 1...Motorcycle, 2...Vehicle frame, 3...
...Main frame, 4...Subframe, 6...Main pipe, 8...Steering shaft tube, 11...Engine, 11a
... cylinder, 12 ... fuel tank, 13 ... seat rail, 14 ... seat pillar, 16 ... seat, 17 ... carburetor, 18 ... air cleaner,
19b...Outside air introduction port.

Claims (1)

[Scope of Claims] 1. The vehicle body frame is composed of a pair of left and right main pipes extending downward from the steering shaft tube, and a pair of left and right seat rails extending rearward from the front and rear midpoints of these main pipes. The engine supported by the body frame is a parallel multi-cylinder engine, with a fuel tank disposed above each cylinder, a carburetor and an air cleaner connected to the rear of each cylinder, and a fuel tank mounted above the seat rail. In the component arrangement structure of a motorcycle with a seat attached to the seat, the left and right main pipes are formed almost linearly in side view, and the front parts of these left and right main pipes are connected from the rear parts of the left and right main pipes. The cylinder and carburetor are arranged between the front parts of the left and right main pipes, and the fuel tank is arranged above the front parts of the left and right main pipes, while the air cleaner is arranged between the left and right seat rails. At the same time, the left and right seat rails are arranged to cross substantially the vertical center of the air cleaner when viewed from the side, and the air cleaner is supported by the left and right seat rails, and the vaporizer is disposed above the seat rail. A component arrangement structure for a motorcycle in which an air cleaner is connected to a container, and an outside air inlet is formed in the air cleaner below the seat rail.