JPH0121917Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a motorcycle in which a carburetor is disposed on one side of the vehicle body relative to the engine.

In such motorcycles, an air cleaner is installed on one side of the vehicle body to surround the carburetor.
The aim is to reduce the pressure loss of intake air.

However, in the above-mentioned motorcycle, since the air cleaner protrudes to the lower side of the vehicle, a large bank angle cannot be obtained.

If, in order to increase the bank angle, the air cleaner is placed elsewhere, for example at the rear of the engine as in general motorcycles, the connecting pipe connecting the air cleaner and the carburetor should be bent. Therefore, the pressure loss of the air in the suction chamber becomes large.

On the other hand, in motorcycles, in order to improve handling stability, an air cleaner is placed at the top of the vehicle body, and a fuel tank is placed in the center of the vehicle body, thereby lowering the center of gravity of the vehicle body as much as possible. ing.

Therefore, the purpose of the present invention is to apply this type of air cleaner layout to a motorcycle with a carburetor located on one side of the vehicle body.
It is an object of the present invention to provide a motorcycle that prevents an increase in the pressure loss of intake air in a connecting pipe that communicates an air cleaner and a carburetor, and that can obtain a sufficient bank angle.

In order to achieve the above object, in this invention, in a motorcycle in which the carburetor is arranged on one side of the vehicle body relative to the engine, the air cleaner is arranged in front of the seat on the tank rail, and the fuel tank is arranged below the seat. At the same time, the discharge port of the air cleaner is located on the side of the lower surface of the air cleaner on the carburetor side, and the connection pipe that communicates the discharge port and the carburetor is located in front of the fuel tank and on one side of the vehicle body. It is placed on both sides.

An embodiment of the present invention will be described below based on the drawings. As shown in FIG. 1, a body frame 1 of a motorcycle is provided with a steering head 2 at the front thereof. A tank rail 3 and a down tube 4 are coupled to both upper and lower ends of the steering head 2, respectively, and extend rearward and obliquely downward. A pair of seat rails 5 are coupled to the rear end portion of the tank rail 3 as seat support portions that are bifurcated into left and right bifurcated portions and extend substantially horizontally toward the rear side. A seat 6 is arranged on the pair of seat rails 5. In addition, at the lower end of the down tube 4,
A pair of left and right connecting tubes 7 extending substantially horizontally toward the rear side are connected, and this pair of connecting tubes 7
The rear end portion and the rear end portions of the pair of seat rails 5 are connected by a pair of left and right body tubes 8. And the engine 9 is placed on the pair of connecting tubes 7.
is set. The lower ends of the pair of body tubes 8 and the lower ends of the tank rail 3 are connected by a pair of left and right oblique tubes 10, thereby reinforcing the vehicle body frame 1.

The engine 9 is, for example, a side-disposed rotary valve engine, and a carburetor 11 is disposed on the side of the engine 9, as shown in FIG. On the other hand, an air cleaner 12 is provided between the steering head 2 and the seat 6 so as to straddle the tank rail 3. This air cleaner 1
2 has a similar shape to a normal fuel tank, and has a pair of left and right intake ports 13 on its front side. Further, a discharge port 14 is provided on the lower surface side of the air cleaner and located on the side of the tank rail 3. As shown in FIGS. 1 and 2, this discharge port 14 has a
Conduction pipe 15 extending downward at the lower side in the figure
is attached, and the lower end of this conduction pipe 15 and the intake port 16 of the carburetor 11 are connected to the inlet tube 1.
It is connected at 7.

In FIG. 1, 18 is a cleaner element, 19 is a partition plate, and 20 is a fuel tank. Further, in FIG. 2, 21 is a muffler, and this muffler 21 is arranged on the right side (upper side in FIG. 2) of the tank rail 3. Therefore, the conduction pipe 15
There is no problem in making the inlet tube 17 large in diameter.

The motorcycle is constructed as described above, and the air taken in from the pair of intake ports 13 of the air cleaner 12 is purified by the cleaner element 18, and is taken into the carburetor 11 through the conduit pipe 15 and the inlet tube 17. Ru. At this time, the conduction pipe 1
Since the diameters of the inlet tube 5 and the inlet tube 17 are relatively large, the pressure loss of the air taken into the carburetor 11 is extremely small despite the long distance between the air cleaner 12 and the carburetor 11. Therefore, the output loss of the engine 9 is reduced.

Although one embodiment of the present invention has been described above, the present invention is not limited to the structure shown in the above embodiment and can be modified in various ways.

As described above, in the motorcycle of the present invention, the air cleaner is disposed in front of the seat on the tank rail, the fuel tank is disposed below the seat, and the discharge port of the air cleaner is disposed on the carburetor side under the air cleaner. It is set up.

That is, in the motorcycle of the present invention, the air cleaner is removed from the location where the carburetor is installed, so a sufficient bank angle can be obtained, and the discharge port of the air cleaner is located above the carburetor. Since this is a so-called dead space where no other parts are placed between the discharge port and the carburetor, large diameter connecting pipes (conducting pipes and inlet tubes) can be arranged in a straight line.
Therefore, the increase in pressure loss of the intake air in the connecting pipe can be reduced as much as possible, and since the fuel tank is located below the seat, sufficient capacity is ensured.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is a side view of a vehicle body frame, and FIG. 2 is a plan view schematically showing the arrangement of a conductive pipe and a muffler. 1... Vehicle body frame, 2... Steering head, 5... Seat rail (seat support part), 6...
Seat, 11... Carburetor, 12... Air cleaner, 13... Intake port, 14... Discharge port, 15...
Conduction pipe (connection pipe), 16... Suction port, 17... Inlet tube (connection pipe), 21... Muffler.

Claims (1)

[Scope of utility model registration request] In a motorcycle in which a carburetor is disposed on one side of the vehicle body relative to the engine, an air cleaner is disposed in front of the seat on the tank rail, a fuel tank is disposed below the seat, and the discharge port of the air cleaner is disposed in front of the seat on the tank rail. A connecting pipe connecting the discharge port and the intake port of the carburetor is arranged in front of the fuel tank and on one side of the vehicle body. A motorcycle featuring: