JPH0780474B2 - Front wheel suspension system for motorcycles - Google Patents

Description

TECHNICAL FIELD The present invention relates to a front wheel suspension system for a motorcycle.

[Conventional technology]

For example, as disclosed in Japanese Patent Publication No. 58-49435, there is a motorcycle in which front and rear wheels are suspended by supporting swing arms at the front and rear of an engine unit. this is,
A pair of upper and lower swing arms are pivotally attached to the front part of an engine unit integrally formed with an engine and a gear box so as to be vertically swingable, and the front ends of both swing arms are connected by a knuckle arm, and the knuckle arm The front wheel is supported, the suspension is placed between the engine unit and the lower swing arm to suspend the front wheel, and the steering rod connected to the bar handle supported by the tripod placed above the engine unit is used. Compared to a motorcycle that uses a body frame with a conventional head pipe to connect to a knuckle arm to steer the front wheels, the body frame is simplified and the weight of the body is greatly reduced.

[Problems to be solved by the invention]

However, in the above-mentioned motorcycle, for example, when a V-type engine having cylinder blocks separated from each other in the front and rear is mounted, or when a radiator for cooling the engine is arranged in front of the engine, the upper swing arm interferes with the cylinder block or the radiator. To avoid this, there are restrictions on the arrangement of the upper swing arm and the arrangement of other parts.

Therefore, an object of the present invention is to provide a front wheel suspension device for a motorcycle that does not have a risk of interference with a cylinder block or a radiator.

[Means for solving problems]

To achieve the above object, the present invention comprises a swing arm extending forward from an engine side support portion arranged in the central portion of a motorcycle, which is composed of upper and lower arms, and the front ends of both arms are located on one side of the front wheel. In a front wheel suspension device of a motorcycle, wherein the front wheels are rotatably connected to respective knuckle arms, and the front wheels supported on the lower ends of the knuckle arms are steerably provided. The upper arm is arranged in a bent manner, and the upper arm is composed of two arms whose base ends are pivotally attached to a pair of engine-side support portions spaced apart in the vehicle body width direction. After extending in parallel to the front, the distance between both arms is reduced to taper the tip side to join the tips, and the tip of the upper arm and the upper end of the knuckle arm are connected above the outer periphery of the front wheel. It is characterized by that.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

A motorcycle 1 has an engine unit 2 in which a so-called horizontal V-type engine in which cylinder blocks 2a and 2b are spaced apart from each other in the front and rear are arranged in the center, and a gear box and the like are integrally formed. The front swing arm 4 that supports the front wheel 3 is swingably supported, and the front end 6a of the rear swing arm 6 that supports the rear wheel 5 is supported on the rear portion of the engine unit 2 so as to swing vertically, and the rear swing arm is also supported. 6, the upper end 7a and the lower end 7b of the suspension 7 are pivotally attached to the engine 6 and the engine unit 2, respectively.
Is suspended.

The front swing arm 4 extending forward from the support portion of the engine unit 2 is composed of an upper arm 8 and a lower arm 9, and the front ends of both arms 8 and 9 are arranged on one side of the front wheel 3 to form the front wheel 3. Are rotatably connected to knuckle arms 10 for supporting. The knuckle arm 10 is arranged with its upper end bent over the outer periphery of the front wheel 3.

As shown in FIG. 2, the upper arm 8 has a base end 8 on a pair of support portions spaced apart in the vehicle body width direction of the engine unit 2.
It is composed of two arms 8c and 8d pivotably attached to a and 8b, and the two arms 8c and 8d are radiators provided in front of the cylinder block 2a protruding from the engine unit 2.
Rear arms 8c, 8
The front end of the upper arm 8 is formed by bending d to reduce the distance between the arms 8c and 8d so that the ends are tapered and the ends are joined to each other, and a cross member 8e is provided between the arms 8c and 8d. And the upper end of the knuckle arm 10 are connected via a joint 12 above the outer periphery of the front wheel 3.

The lower arm 9 is jointed to the lower part of the knuckle arm 10
The front end 9a connected via the arm is one arm, and the base end pivotally attached to both sides of the engine unit 2 is two arms.
It has a substantially y shape branched into 9b and 9c, and a suspension 15 is arranged between the engine unit 2 and the engine unit 2 via a progressive link mechanism 14.

A handle support member 16 supported by a front portion of a fuel tank (not shown) or the like is arranged above the front portion of the engine unit 2, and a bar handle 17 has a stem shaft 18 attached to the handle support member 16. It is rotatably supported by being inserted into the handle support member 16, and a connecting rod 19 is connected to the lower end of the stem shaft 18 via a lever (not shown) protruding leftward in the vehicle width direction, The rear end of this connecting rod 19 is a rod 20 that penetrates the engine unit 2 in the vehicle width direction.
One of the levers (not shown) is connected to the steering arm 22 via the other lever 21 of the rod 20 and the tip of the steering arm 22 is connected to the knuckle arm 9 via the joint 23. The front wheel 3 is steered by operating the bar handle 17.

With this structure, the upper arm 8 can swing up and down without interfering with the cylinder block 2a and the radiator 11, and the upper arm 8 can be pivotally mounted at a position where a sufficient length can be secured. In addition, the cylinder block 2a and radiator
The arrangement of 11 is not restricted, and the vehicle space can be effectively used.

〔The invention's effect〕

As described above, according to the present invention, the swing arm extending forward from the engine side support portion arranged in the center portion of the motorcycle is composed of upper and lower arms, and the front ends of both arms are arranged on one side of the front wheel. In a front wheel suspension system for a motorcycle, wherein the front wheels supported by the lower ends of the knuckle arms are rotatably connected to each other, and the front wheels are rotatably supported. And the upper arm is composed of two arms whose base ends are pivotally attached to a pair of engine-side support portions that are spaced apart from each other in the vehicle body width direction, and the two arms are substantially parallel to each other by a predetermined amount. After extending forward, the distance between both arms is reduced to taper the tip side to join the tips, and the tip of the upper arm and the upper end of the knuckle arm are connected above the outer periphery of the front wheel. , For example, a cylinder block Even if a V-type engine that is separated later is installed, or even if a radiator that cools the engine is arranged in front of the engine, these are arranged between the substantially parallel parts of the two arms of the upper arm, so the upper arm It is possible to swing up and down without interfering with other parts such as the cylinder block and the radiator, so that the vehicle space can be effectively used.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is a side view of a motorcycle, and FIG. 2 is a plan view of an upper arm. 1 ... Motorcycle, 2 ... Engine unit, 3 ... Front wheel, 4 ... Swing arm, 8 ... Upper arm, 8a, 8b
...... Upper arms, 9 ...... Lower arm, 10 ...... Knuckle arm

Claims (1)

[Claims] 1. A swing arm extending forward from an engine side support portion arranged at a central portion of a motorcycle is composed of upper and lower arms, and front ends of both arms are arranged on one side of a front wheel. In a front wheel suspension system of a motorcycle, which is rotatably connected to a knuckle arm and has front wheels supported on the lower end of the knuckle arm, capable of being steered. Along with the above, the upper arm is composed of two arms whose base ends are pivotally attached to a pair of engine-side support portions that are separated in the vehicle body width direction,
After extending the two arms forward substantially in parallel by a predetermined amount, the distance between both arms is reduced to taper the tip ends to join the tips, and the tip of the upper arm and the upper end of the knuckle arm are joined. A front wheel suspension device for a motorcycle, wherein the front wheels are connected above the outer periphery of the front wheels.