JPS6224633Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a two-wheel drive motorcycle that drives both front wheels and rear wheels.

Traditionally, two-wheeled motorcycles did not have all-wheel drive vehicles that drive both the front and rear wheels like four-wheeled vehicles.
In particular, when driving on sandy terrain, the front wheels may become buried in the sand, making it impossible to drive, and there are also problems in that sufficient climbing power cannot be obtained on soft slopes such as sandy soil.

This invention focuses on the above-mentioned problems and provides a two-wheel drive motorcycle that drives both the front and rear wheels to facilitate running on soft ground such as sandy soil, and that can exhibit great climbing power especially on slopes such as sandy soil. The purpose is to

To this end, this idea was developed to attach a second engine to the front of the front fork in a motorcycle in which the rear wheel is rotationally driven by the first engine mounted on the main frame, and to transmit the driving force of the second engine to the front wheel. The intermediate sprocket portion for the engine is pivotally supported by link members pivotally supported at the upper and lower portions of the front fork via a shock absorber, and the output shaft of the second engine, the intermediate sprocket portion, and the axle of the front wheel are connected to the chain. The gist is that they are connected in order by sprockets.

Hereinafter, embodiments of this invention will be described based on the drawings.

Figure 1 shows a front view of a two-wheel drive motorcycle;
The figure shows a front right side view of the same. Reference numeral 1 indicates the main frame of the motorcycle. A first engine 2 is mounted in the center of the main frame 1. The rotational driving force of the first engine 2 is transmitted to the clutch and transmission 3. In this structure, the power is transmitted to the rear wheel (not shown) via a chain or the like. A front fork 4 is rotatably supported on the front part of the main frame 1.
is provided with an extendable shock absorber 4a, and the axle 6 of the front wheel 5 is supported at the lower end of the shock absorber 4a. 7 is a second part attached to the upper front part of the front fork 4.
It is an engine and is used to drive the front wheels 5.
8 is a shaft 8a at an intermediate connection point between link members 9 and 10.
It is an intermediate sprocket part pivotally supported by 2
Sprockets 8b and 8c are rotatable on a shaft 8a. The end of the link member 10 is pivotally supported on the front fork 4, while the end of the link member 9 is pivotally supported on the lower end of the front fork 4 via a shock absorber 4a, so that the front fork is When the shock absorber 4a expands or contracts, this movement is allowed and the tension of the chain, which will be described later, remains unchanged. Further, the sprocket 8b of the intermediate sprocket portion 8 is connected to the sprocket 1 which is pivotally connected to the axle 6 of the front wheel 5 by a chain 11.
The sprocket 8c is connected by a chain 13 to a sprocket 15 attached to the output shaft of the transmission 14 of the second engine 7, and the rotational driving force of the second engine 7 is transmitted through the chain 13, the intermediate sprocket part 8, and the sprocket 8c. The configuration is such that the power is transmitted to the front wheels 5 via the chain 11. 16 is a handle fixed to the top of the front fork, 17 is a heating tank, 18
is a front wheel disc brake. Note that the accelerator, clutch, and
The transmissions are connected by wire cables or the like and operated in the same manner.

In the motorcycle configured in this way, the first engine 2 rotationally drives the rear wheel, and the second engine 2 rotates the rear wheel.
The front wheels 5 are driven by the engine 7 at the same speed as the rear wheels, and the vehicle travels by two-wheel drive. While driving, front wheel 5
When the load applied to the front fork 4 changes and the length of the front fork 4 is expanded or contracted by the shock absorber 4a, the length between the sprocket 8b and the sprocket 12 of the front wheel 5 does not change due to the link member 9, and the length between the link member 10 As a result, the length between the sprocket 8c and the sprocket 15 of the second engine 7 does not change, and it is handled by changing the connection angle of the link members 9 and 10, so the tension in the two chains 11 and 13 hardly changes. Without this, stable chain drive of the front wheels 5 can be performed.

As described above, according to the two-wheel drive motorcycle according to this invention, the rear wheel is rotationally driven by the first engine, and the front wheel is rotationally driven by the second engine at the same speed to perform all-wheel drive driving of the motorcycle. I can do it. Therefore, it is possible to perform sufficient running even on a soft road surface such as a sandy ground, and it is also possible to exert a large climbing power especially on a sloped road such as a sandy ground.

[Brief explanation of the drawing]

The figures show an embodiment of this invention, with FIG. 1 being a front view of a two-wheel drive motorcycle, and FIG. 2 being a right side view of the front part thereof. 1... Main frame, 2... First engine,
4...Front fork, 4a...Buffer device, 5
...Front wheel, 6...Axle, 7...Second engine, 8
...Intermediate sprocket portion, 9, 10... Link member, 11, 13... Chain, 12... Sprocket.

Claims (1)

[Scope of utility model registration request] In a motorcycle in which the rear wheel is rotationally driven by a first engine mounted on a main frame, a second engine is attached to the front part of the front fork, and an intermediate sprocket part for transmitting the driving force of the second engine to the front wheel. is pivotally supported by link members pivotally supported at the upper and lower parts of the front fork via a shock absorber, and the output shaft of the second engine, the intermediate sprocket portion, and the axle of the front wheel are sequentially connected by a chain and a sprocket. A two-wheel drive motorcycle characterized by: