JPS6114950Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a frameless type motorcycle, in particular, it eliminates the frame, uses the engine as a frame member, and connects the cylinder head to the head pipe to support the front wheel so that it can be steered freely. The present invention relates to a motorcycle which is light in weight and has a simple structure while achieving sufficient strength for practical use.

Motorcycles generally have a frame, on which are mounted an engine, fuel tank, seat, and other parts, and the number of parts is basically the same even if it is small. Structural parts are required, resulting in a large number of parts.

On the other hand, a quasi-frameless motorcycle that omitted most of the frame was proposed in Japanese Patent Application Laid-open No. 142739/1983, but this proposal did not include a steering mechanism, a steering mechanism,
A specific solution such as front wheel suspension is required separately, and solving this requires a completely separate structure from the conventional one, making the structure complicated, and even though it is frameless, there is a problem between the front wheel damper etc. and the engine. A frame is required, and furthermore, it is difficult to use this proposal directly as a motorcycle as it is in practice.

The present invention was designed to eliminate the frame as a frameless motorcycle, and to be able to be used as a frameless motorcycle immediately in practical use.
The objective is to arrange the cylinders of the engine in the front-rear direction, connect the cylinder head to the head pipe, make the engine a frame that extends behind the head pipe, and use the head pipe to pivot the front forks that support the front wheels. In addition, to provide a frameless motorcycle which can be easily obtained in practical use and has excellent strength by pivoting a rear fork for supporting a rear wheel at the rear of an engine.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a side view of the motorcycle 1, and Figs. 2 to 4 are views showing the head pipe portion.The engine 2 is arranged so that the cylinders face in the longitudinal direction, and from the front there are the cylinder head 3, the cylinder Block 4, crankcase 5 and transmission case 6
Case 7 consists of

Reference numeral 8 designates a head pipe, and two stays 9 are provided extending parallel to both sides of the head pipe 8. In the embodiment, a semicircular contact plate 9a is joined to the rear half of the head pipe, and the stays 9, 9 are attached to the head pipe 8. One end is joined, and a mounting plate 10 is joined so as to span between the rear ends of the stays 9, 9, and the stays 9, 9, head pipe 8, and mounting plate 10 are joined by welding. The mounting plate 10 is provided with mounting holes 11 at its four corners as shown in FIG. 4, and has a corresponding surface shape so that it can be overlapped with the top surface of the cylinder head 3. Stack the mounting plate 10 on the top surface of the cylinder head 3, pass the stud bolts 12 vertically passing through the cylinder head 3 and cylinder block 4 through the mounting holes 11, and tighten the mounting plate 10 with nuts 13.
Attach it to the top of the cylinder head 3. A steering stem is passed through the head pipe 8, and a front fork 14 is attached to the upper and lower ends of the steering stem.
5 and 16, and the front fork 14
The front wheel 17 is supported at the lower part of the front fork 14, and a handle 18 is provided on the top bridge 15, and a head light 19 is provided at the center of the handle 18 in the width direction. will be established.

On the rear part of the case 7 of the engine 2 is a seat stay 20 made of a press-molded steel plate with an inverted concave end face.
Specifically, the front and rear lower parts of the side plates 20a of the seatstay 20 are connected to the case 7, the seat 21 is mounted on the seatstay 20, and the fuel tank 22 is mounted below the front of the seat. Provided, tank 22
is disposed between the upper portions of both side plates 20a, and an air cleaner 23 is provided between the both side plates above the rear part of the case and below the tank 22. A suction pipe 24 is protruded from the cylinder head 3 and is connected to a fuel supply device such as a carburetor 25. It is connected to the cleaner 23. The front end of a rear fork 27 is pivotally attached 27a to the rear of the case 7, and the rear fork 27 supports a rear wheel 29 via an axle 28.The rear wheel 29 is equipped with a driven sprocket 30, and The sprocket 31 protruding from one side of the transmission case 6 and the driven sprocket 30 are connected by a chain 32, and the rear wheel 29
In the embodiment, it is driven by a chain mechanism. At the front of the rear fork 27 is the rear action unit 3.
3 and connect the lower ends of the rear action unit 33.
The upper ends are connected by a pin 34 installed in the center between the two side plates 20a on the engine side.

An exhaust pipe 3 is located below the cylinder head 3 at the rear and below.
5 is led out, and the exhaust pipe 35 is connected to a muffler 36 disposed below the case 7. A bracket 37 is provided hanging down from the lower part of the case 7, and the bracket 37 is provided on the left and right sides of the middle part of the muffler 36 to support it. is change pedal 3
9 is installed.

As is clear from the above, according to the present invention, it is possible to commercialize and obtain a frameless motorcycle using the engine as a frame, and in particular, since the cylinder head is connected to the head pipe, it is generally adopted as a front wheel suspension system for motorcycles. Using a telescopic front fork, it is possible to realize a simple and highly reliable front wheel suspension and steering system similar to conventional ones, making it possible to create a frameless motorcycle that is simple and practical without using a frame at all. It has many advantages such as a simple structure and a light weight.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a side view of a motorcycle, Figure 2 is a side view of a head pipe, Figure 3 is a cross-sectional view of the same, and Figure 4 is a view taken in the direction of the arrow in Figure 2. It is a view of four directions. In the drawings, 1 is a motorcycle, 2 is an engine, 3 is a cylinder head, 7 is a case, 8 is a head pipe, 14 is a front fork, 17 is a front wheel, 18
is the handle.

Claims (1)

[Scope of utility model registration request] The engine is arranged so that the cylinders face in the longitudinal direction, and a head pipe is connected to the cylinder head of the engine, which supports the front wheels at the bottom and supports the front fork, which has a handle attached to the top end, so that it can be steered. A motorcycle characterized in that a rear fork for supporting a rear wheel and a seat support member are attached to a case part.