JPH06293283A - Front wheel supporting structure for motorcycle - Google Patents

Abstract

PURPOSE:To provide a front wheel supporting structure capable of suppressing a shock in the case of riding over a protrusion of a road surface in a leading type front wheel supporting motorcycle. CONSTITUTION:A knuckle 8 for rotatably supporting a front wheel 12 is steerably supported through upper/lower swing arms 4, 5 pivotally supported to a car body 3, to form these upper/lower swing arms 4, 5 into a 4-link mechanism where an angle B interposed by a straight line of connecting both connecting points 4a, 5a in a side of this knuckle 8 and a road surface is increased in accordance with a stroke of the knuckle 8 in an upward direction, and further the front wheel 12 is arranged in an end part in a side of the connecting point 5a of the swing arm 5 in a lower side of the knuckle 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front wheel support structure for a motorcycle (including a motorcycle).

[0002]

2. Description of the Related Art In a motorcycle, there is a leading front wheel suspension system in which a knuckle for axially supporting front wheels is supported by a vehicle body via upper and lower swing arms pivotally supported at the rear. Disclosed in.

[0003]

By the way, when the front wheels run on the road surface, a rearward force and an upward force act on the front wheels. In this case, if the resultant force direction of both acting forces and the locus of the axle of the front wheel are substantially coincident with each other, the ride over performance on the protrusion is excellent and the riding comfort is improved.

The present invention has been made in order to meet such a problem, and the object thereof is to devise the arrangement of the upper and lower swing arms so that the front and rear wheels act on the front wheels when riding on the projection. Another object of the present invention is to provide a front wheel support structure for a motorcycle in which a locus of an axle that substantially matches the direction of the combined force of is obtained.

[0005]

In order to solve the above-mentioned problems, in a motorcycle in which a knuckle for axially supporting front wheels is rotatably supported via upper and lower swing arms pivotally supported by a vehicle body, In the upper and lower swing arms, the included angle between the straight line connecting both connection points on the knuckle side and the road surface increases in accordance with the upward knuckle stroke.
A link mechanism is formed, and the front wheel is arranged at the end of the swing arm below the knuckle on the connection point side.

[0006]

When the knuckle is stroked upwards, the included angle between the straight line connecting the upper and lower swing arm connection points of the knuckle and the road surface increases, so that the end of the lower swing arm connection point side The front wheel axle position is moved upward and backward with respect to the vehicle body.Therefore, when riding over a road surface protrusion, etc., the upward and rearward acting forces received by the front wheel from the protrusion are absorbed by the movement in the respective directions. , The acting force transmitted to the vehicle body is reduced.

[0007]

Embodiments will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a front wheel support structure according to an embodiment. In the embodiment, it is applied to a motorcycle, but the present invention can also be applied to a motorcycle.

In the figure, 1 is a handle, 2 is an engine, the engine 2 is mounted on a frame 3, and the rear ends of two swing arms 4 and 5 at the front of the frame 3 are spindles 6 and 7.
Each is pivoted at. A knuckle 8 is connected and supported at the front ends of both swing arms 4 and 5, and an axle 12 of a front wheel 11 is supported below a connection point with the lower swing arm 5 of the knuckle 8.

A tie rod 15 interlocking with the handle 1 is connected to an intermediate portion of the knuckle 8, and a bell crank 16, a link 17 and a shock absorber 18 are installed between the lower swing arm 5 and the frame 3.

In the above, the upper and lower swing arms 4 and 5 are arranged so as to converge in a region in front of and above the axle 12 as shown. That is, the intersection O of the extension lines 11 and 12 of the swing arms 4 and 5 is arranged in the area A.

Since the intersection point O is arranged in the area A in this way, the swing locus L of the axle 12 of the front wheel 11 draws an arc centering on the intersection point O, and after the swing movement, the knuckle 8 moves. The included angle B of the straight line connecting the connecting points 4a, 5a of the upper and lower swing arms 4, 5 with respect to the road surface is increased to the straight line position connecting the new connecting points 4b, 5b, and the front wheel 1
1 is moved upward and backward with respect to the vehicle body.

Therefore, when riding on the projection G on the road surface, the direction of the locus L substantially coincides with the direction of the combined force F of the rearward force F1 acting on the front wheel 11 and the upward force F2. The riding performance of the front wheel 11 against the G is excellent, and the riding comfort is improved.

[0014]

As described above, according to the front wheel support structure of the present invention, although the front wheel is a leading type having upper and lower swing arms, when the front wheel rides on the projection of the road surface, the front wheel is raised above the vehicle body. Since the front wheels are moved rearward and rearward, the combined force from the projections acting on the front wheels is absorbed by the movement of the front wheels upward and rearward with respect to the vehicle body, and by this mitigating action, the motorcycle having the front wheel support structure according to the present invention is provided. Has an excellent ability to ride over the protrusion, and the riding comfort thereof can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present apparatus.

[Explanation of symbols]

3 ... Frame, 4,5 ... Swing arm, 4a, 4b,
5a, 5b ... connecting point, 8 ... knuckle, 11 ... front wheel, 12
... Axle, A ... Region, B ... Inclined angle, F ... Synthetic force, G ... Protrusion,
L ... trajectory.

Claims (1)

[Claims] 1. A motorcycle in which a knuckle that pivotally supports a front wheel is rotatably supported via upper and lower swing arms pivotally supported by a vehicle body, wherein the upper and lower swing arms are provided on both sides of the knuckle side. There is a 4-link mechanism in which the included angle between the straight line connecting the connecting points and the road surface increases in accordance with the upward knuckle stroke, and the front wheels are at the connecting point side end of the lower swing arm of the knuckle. A front wheel support structure for a motorcycle characterized by being provided.