JPS62146792A - Mounting structure to car body of front fork - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of mounting a front fork used in a motorcycle or the like to a vehicle body.

(Prior Art) For example, in a motorcycle, as shown in FIGS. 4 and 5, an inverted front fork (50) having an inner tube (52) slidably fitted into an outer tube (51) is used. When installing on the vehicle body, insert the bracket (53) with the slot (53a) into its through hole (53b).
To install the bracket (53), insert the front fork (50) into the hole (53c) and attach it to the vehicle body by inserting the steering stem (not shown) into the bracket (53).
) and nuts (55) to secure the front fork (50) by tightening the flange portions (53d) and (53e) of the bracket (53).

(Problem to be Solved by the Invention) Incidentally, in a front fork in which an inner tube is slidably fitted into an outer tube, there is a gap between the outer tube and the inner tube in order to smooth the sliding movement between the two. Interpose a slide bearing.

In this case, in order to reduce the friction coefficient against twisting of the inner tube and ensure its vertical movement, it is better to have as wide a gap as possible between the two slide bearings interposed between the outer tube and the inner tube.
It is desirable to attach it to the outer peripheral surface of the upper end of the inner tube and the inner peripheral surface of the lower end of the outer tube.

However, in the conventional mounting structure described above, the flange portions (53c) and (53d) of the bracket (53) are
Since the outer tube (51) is fixed by tightening the outer tube (51) with the bracket) (54) and the oak (55), the part of the outer tube (51) that is tightened with the bracket (53) and the surrounding area deform inward. There are many things.

Therefore, as shown in Figure 4, the conventional front fork (
In 50), the slide bearings (5B) and (57) are fitted below the lower end of the inner peripheral surface of the outer tube (51) and the part that fixes the bracket (53), and as a result, In some cases, the rigidity against torsion was insufficient, and sliding could not be performed smoothly.

(Means for solving the problem) In order to solve the above problem, the present invention integrally forms a mounting part in the middle part of the outer tube, and this mounting part is attached from the side of the vehicle body via bolts. Plato is fitted in a concave and convex manner.

(Function) The parts are attached to the bracket without affecting the inner diameter of the outer tube, and since the bracket and the outer tube fit in a concave-convex manner, accurate positioning is achieved.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a half-sectional view showing the structure of the front fork attached to the vehicle body according to the present invention, FIG. 2 is a cross-sectional view of FIG. 1,
FIG. 3 is a front view of FIG. 2 viewed from the direction indicated by the arrow ■.

The front fork (1) consists of an inner tube (3) slidably fitted into an outer tube (2), and the outer circumferential surface of the upper end of the inner tube (3) and the lower end of the outer tube (2). Slide bearings (4) and (5) are fitted on the inner peripheral surfaces, respectively. In addition, an upper bracket (e) is attached to the outer surface of the upper end of the outer tube (2).
A joint metal (7) is attached to the lower end of the inner tube (3).

In addition, a portion (9) for attaching to the lower bracket (10) is formed in a single body approximately at the center of the outer tube (2),
The bracket (10) and the mounting part (9) have a positioning protrusion (9a) and a recess (10a) that fit into each other, respectively.
) is formed, and the bracket (10) is formed with an overhang part (10b) that engages with the upper end surface of the half-rest (9), and the mounting part (8) is formed with flange parts (9b) and (9c). Then, drill two bolt holes (9d) and (9e) in each flange part (9b) and (9c), and then insert the bracket (
10) is installed using bolt holes (9d) and (9e) in part (9).
) are formed with corresponding screw holes (10b) and (10c).

Therefore, when attaching the front fork (1) to the vehicle body, the attachment formed on the outer tube (2) is the bracket (with the convex portion (9a) of part (9) attached to the vehicle body).
(10) is fitted into the other recess ()Oa).

After that, bracket (10) c7) bolt hole (9d)
, Pass the pole (+1) through (9e) and tighten it, and fix the front fork (1) to the vehicle body by fixing part (9) to the bracket (10).

In this case, the outer tube (2) of the front fork (1) is not deformed due to being tightened by the bracket (10), and the outer circumferential surface of the upper end of the inner tube (3) and the lower end of the outer tube (2) slide bearings (4) on the inner circumferential surface of each.

Even if (5) is fitted, the sliding movement of the inner tube (3) is not hindered, resulting in no locking or slow vertical movement.

Furthermore, even when a force (F) in the direction of the arrow in Fig. 1 is applied to the front fork (1), the overhang part (10b) of the bracket (10) and the mounting part (8) are in contact with each other. During installation, no misalignment occurs between part (8) and bracket (10).

(Effects of the Invention) As explained above, according to the present invention, when the outer tube of the front fork is attached to the bracket on the vehicle body side, the inner diameter of the outer tube does not change. Two slide bearings can be attached to the outer circumferential surface of the upper end of the inner tube and the inner circumferential surface of the lower end of the outer tube, respectively, reducing the coefficient of friction against twisting of the inner tube and controlling its vertical movement. can be done smoothly.

[Brief explanation of drawings]

Fig. 1 is a half-sectional view showing the structure of the front fork attached to the vehicle body according to the present invention, Fig. 2 is a cross-sectional view of Fig. 1, and Fig. 3 is a view of Fig. 2 from the direction of the arrow ■. 4 is a front view, FIG. 4 is a half-sectional view showing the structure of a conventional front fork mounted on a vehicle body, and FIG. 5 is a horizontal half-sectional view of FIG. 4. In the drawings, (1) is the front fork, (2) is the outer tube, (3) is the inner tube, and (6). (7) is the slide bearing, and (9) is the mounting part. (lO) is the bracket, (9a) is the convex part, (10a)
is a recess, and (11) is a bolt.

Claims (1)

[Claims] In a structure in which a front fork, in which an inner tube is slidably fitted into an outer tube, is attached to the vehicle body via a bracket, a mounting part for the bracket is integrally provided in the middle part of the outer tube, and this mounting part is It is connected to the bracket via bolts in abutted state from the side of the vehicle body, and further, a part of the mounting part is formed with a convex part or a concave part that engages with a concave part or a convex part of the bracket. The structure for attaching the front fork to the vehicle body.