JPH0121916Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Industrial Application Field The present invention relates to motorcycles, and particularly to motorcycles in which an air cleaner is disposed on the upper part of the vehicle body. Regarding the constructed motorcycle.

b. Prior art and its problems In conventional motorcycles, a fuel tank is disposed in the upper part of the vehicle body, and an air cleaner and the like are disposed in the center of the vehicle body. However, there is no necessity to place the fuel tank at the top of the car body.In order to improve handling stability, relatively heavy fuel tanks should be placed in the center of the car body, and relatively lightweight air cleaners etc. should be placed in the car body. It is desirable to place it at the top to lower the center of gravity of the vehicle. By the way, for example, when an air cleaner is disposed in the upper part of a vehicle body, the distance between the air cleaner and the carburetor becomes long, and pressure loss of air sucked into the carburetor becomes a problem. To solve this problem, for example, it has been proposed to enlarge the air extraction passage of the air cleaner, but in reality, it is difficult to enlarge the air extraction passage due to space constraints due to the arrangement with other parts. It was hot.

The present invention was devised in view of these circumstances, and its purpose is to enlarge the air intake passage of the air cleaner in motorcycles with an air cleaner installed on the upper part of the vehicle body so that the air can be sucked into the carburetor. The aim is to reduce the pressure loss of air.

c. Means for Solving the Problems The present invention aims to solve the above-mentioned problems. In a motorcycle in which an air cleaner is disposed on a main pipe extending from above, the pair of seat rails are gradually brought closer to each other on the front side of the seat and connected to the lower part of the main pipe, and the pair of seats are formed on the front side of the seat. The large diameter air take-off passage provided in the air cleaner is inserted between the rails in a substantially vertically downward direction and connected to the carburetor.

d Example An example of the present invention will be described below based on the drawings. FIG. 1 shows a body frame 1 of a motorcycle, and a steering head 2 is provided at the front of the body frame 1. A main pipe 3 and a down tube 4, which extend rearward and diagonally downward, are connected to both upper and lower ends of the steering head 2, respectively. As shown in FIGS. 1 and 2, a pair of seat rails 5 are connected to the lower part of the main pipe 3 as seat support members that are bifurcated into left and right branches and extend rearward. A seat 6 is arranged above. Main pipe 3 above
Specifically, the joining position between the seat rail 5 and the pair of seat rails 5 is closer to the front than in the case of a conventional motorcycle.
Therefore, the distance between the front ends 5a of the pair of seat rails 5 is the same as that between the front ends 6a of the seat 6 and the main pipe 3.
The distance between the two is considerably wider than before.

On the other hand, a pair of left and right connecting tubes 7 extending substantially horizontally to the rear side are connected to the lower end of the down tube 4, and the rear ends of the pair of connecting tubes 7 and the rear ends of the pair of seat rails 5 are connected to each other. They are connected by a pair of body tubes 8. Then, the engine 9 is set on the pair of connecting tubes 7.
The lower end portions of the pair of body tubes 8 and the lower end portions of the main pipe 3 are connected by a pair of left and right oblique tubes 10 to reinforce the vehicle body frame 1.

An air cleaner 11 is disposed on the main pipe 3, as shown in FIG. The air cleaner 11 has a shape substantially similar to a normal fuel tank, and is supported by the front end of the main pipe 3 and the front ends of the pair of seat rails 5. Note that the volume of the air cleaner 11 can be easily increased by increasing the inclination angle of the main pipe. On the other hand, between the front ends 5a of the pair of seat rails 5, as shown in FIGS. 1 and 2, a relatively large-diameter conduction pipe 12 serving as an air extraction passage is inserted approximately vertically downward. , the upper end of this conduit pipe 12 is connected to the air cleaner 11
is connected to the rear end of the Further, the lower end of the conduit tube 12 is connected to a carburetor 14 via an inlet tube 13. and air cleaner 1
1 is supplied to a carburetor 14 through a conduit pipe 12 and an inlet tube 13. In addition, Figures 1 and 2
In the figure, 15 is a muffler.

The motorcycle is constructed as described above, and the air purified by the air cleaner 11 passes through the conduction pipe 12 and the inlet tube 13 to the carburetor 14.
is inhaled. At this time, since the vehicle body frame structure is constructed as described above, the conductive pipe 12 has a relatively large diameter and can be inserted between the seat rails facing approximately vertically downward, and between the air cleaner 11 and the carburetor 14. Despite the long distance, the pressure loss of the air taken into the carburetor 14 can be reduced, and the outlet loss of the engine 9 can be 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.

e Effects of the invention As mentioned above, the present invention is a motorcycle in which an air cleaner is placed above the vehicle body in consideration of handling stability, etc., in which the connection between the pair of seat rails on which the seat is mounted and the main pipe is fixed to the seat rail. The air outlet passageway of the air cleaner has a large diameter and is inserted between the pair of seat rails facing almost vertically downward, so that the front end of the seat is It is possible to shorten the air intake passage of the air cleaner without moving it to the rear, reducing the pressure loss of the air sucked into the carburetor, which in turn reduces engine output loss. be able to.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of a body frame of a motorcycle, and Fig. 2 is a plan view schematically showing the arrangement of air intake passages. . DESCRIPTION OF SYMBOLS 1... Vehicle body frame, 2... Steering head, 3... Main pipe, 5... Seat rail (seat support member), 6... Seat, 11... Air cleaner, 12... Conduit pipe (air intake passage), 13...
...Inlet tube, 14... Carburetor.

Claims (1)

[Scope of utility model registration request] In a motorcycle in which an air cleaner is disposed on the main pipe extending diagonally backward and downward from the steering head pipe on the front side of the seat placed on a pair of left and right seat rails, the pair of seat rails are placed on the seat rails. The large-diameter air take-off passage provided in the air cleaner is directed approximately vertically downward between a pair of seat rails formed at the front side of the seat, gradually approaching the front side and connecting with the lower part of the main pipe. A motorcycle characterized by being connected to an insertion carburetor.