JPH06298148A - Front fork fitting structure of motorcycle - Google Patents

Abstract

PURPOSE:To detachably fit a front fork to a bracket easily so as to be favorable for maintenance, project no cap bolt over the upper face of the bracket, and hence subject layout of the front part of a body to no restriction. CONSTITUTION:In a fitting construction of a front fork 25 in which the front fork 25 rotationally movably supporting a front wheel is fitted to a body through a bracket 28, the bracket 28 is provided with means 28b, 2bc to detachably fit the front fork 25 in the front direction, and omission preventing means 33a, 33b, 34 for the front fork 25 in the bracket 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front fork mounting structure for a motorcycle.

[0002]

2. Description of the Related Art For example, in a motorcycle such as a scooter type vehicle, as shown in FIGS. 9, 10 (a) and 10 (b), an inner tube 2 is slidably fitted in an outer tube 1 to form a front portion. When mounting the fork 3 on the bracket 4, insert the front fork 3 into the mounting hole 6 of the bracket 4 having the slit portion 5 and tighten the tightening bolt 7
The front fork 3 was fixed by tightening the flange portion 8 of the bracket 4. Further, the cap bolt 9 prevents the front fork 3 from falling down.

[0003]

However, when adjusting or servicing the front fork, it is necessary to remove the front fork from the bracket. For that purpose, the cap fork is removed, and then the front fork is pulled out downward. It was difficult to remove the front fork unless the front wheel around the lower end of the front fork had to be removed beforehand. Especially for motorcycles equipped with cowlings, the front forks could not be adjusted or maintained without removing the cowlings, and the maintainability was poor.

Further, in the scooter type vehicle, the inner fender is arranged right above the bracket, but the cap bolt projects upward from the upper surface of the bracket, so that the layout of the front portion of the vehicle body is limited.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a front fork mounting structure for a motorcycle, in which the front fork can be easily attached to and detached from the bracket and has good maintainability.

Another object of the present invention is to provide a front fork mounting structure for a motorcycle in which the cap bolt does not project upward from the upper surface of the bracket and the layout of the front portion of the vehicle body is not limited.

[0007]

In order to solve the above-mentioned problems, a front fork mounting structure for a motorcycle according to the present invention has a front fork for rotatably supporting a front wheel as set forth in claim 1. In the mounting structure of the front fork, which is mounted on the vehicle body via the bracket, the bracket includes means for attaching and detaching the front fork in the front direction.

In order to solve the above-mentioned problems, the front fork is prevented from falling off in the bracket as described in claim 2.

[0009]

According to the present invention having the above-mentioned structure, in the front fork mounting structure in which the front fork for rotatably supporting the front wheels is mounted on the vehicle body through the bracket, in the bracket, the front fork is in the forward direction. Since the detachable means is provided, the front fork can be easily attached to and detached from the bracket, improving maintainability.

Further, since the front fork drop-out preventing means is provided in the bracket, the cap bolt does not project upward from the upper surface of the bracket, and the layout of the front portion of the vehicle body is not restricted.

[0011]

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

FIG. 1 is a left side view showing an example of a scooter type vehicle to which the present invention is applied.

In FIG. 1, the scooter type vehicle 11 has a vehicle body frame 12, and the vehicle body frame 12 has a down tube 1 extending obliquely downward from a head pipe 13.
4 and a pair of left and right rear frames 15 whose front ends are fixed to the down tubes 14 and which extend rearward and upward.

An engine unit 16 as a power unit is swingably provided at the lower center of the rear frame 15. The engine unit 16 includes an engine (not shown) and a conductive case 17 extending rearward from one side of the engine, and a rear wheel 18 as a driving wheel is held at a rear end of the conductive case 17. The conductive case 17 also serves as a swing arm, and is elastically supported by the rear frame 15 by the rear shock absorber 19.

The rear leg shield 2 is provided above the portion where the down tube 14 and the rear frame 15 are joined.
0 is provided. A leg shield cover 21 standing upward from the front end of the rear leg shield 20 is provided, and a front leg shield 22 is provided at the front portion of the leg shield cover 21.

The head pipe 13 is located inside the front leg shield 22, a steering mechanism 23 is provided on the head pipe 13, and a front fork 25 for rotatably supporting a front wheel 24 is provided on the steering mechanism 23. To be

As shown in FIG. 2, the front fork 25 is of a general telescopic type, and a pair of left and right inner tubes 27 sandwiching the front wheel 24 and a pair of left and right inner tubes 27 are slidable. The left and right inner tubes 27 are fixed in parallel by a bracket 28 of the steering mechanism 23.
Further, the steering mechanism 23 is provided with a handlebar 29, a headlight 30, instruments (not shown), etc., and is pivotally mounted together with the front fork 25 so as to be rotatable left and right. An inner fender 31 that prevents mud or the like from entering the lower portion of the head pipe 13 is disposed immediately above the bracket 28 in the front leg shield 22.

FIG. 3 (a) is an enlarged plan view of a portion of the bracket 28 to which the inner tube 27 is fixed, and FIG. 3 (b) is a sectional view taken along the line AA of FIG. 3 (a). It is a figure.

As shown in FIGS. 2, 3 (a) and 3 (b), both ends 28b of the bracket 28 are separable in the forward direction, and the bracket main body 28a and the pair of left and right bracket holders 28c. Front fork 25 which is divided into
Is a means that can be attached and removed in the forward direction. Bracket holder 2
8c is fixed to both ends 28b of the bracket body by, for example, a plurality of bolts 32.

On the other hand, on the inner surface of the bracket holder 28c and the inner surfaces of both end portions 28b of the bracket body facing these bracket holders 28c, projecting portions 33a, 33b which are means for preventing the front fork 25 from falling off are formed, respectively. It Also, these protrusions 33a, 33b
A groove portion 34 which is a means for preventing the front fork 25 from coming off is formed at a portion corresponding to the front fork 25, and when the front fork 25 is clamped by the bracket 28, the protrusions 33a and 33b of the bracket 28 are attached to the front fork 25. It is adapted to engage with the groove portion 34 of 25.

A cap bolt 35 is screwed onto the upper end of the front fork 25. On the upper surface of the cap bolt 35, a wrench hole 36 into which a tip of a hexagon wrench or the like that is a screwing means of the cap bolt 35 is fitted is formed.

Next, the operation of this embodiment will be described.

FIG. 4 shows a mounting structure of the front fork 25 to the bracket 28.

As shown in FIG. 4, the front fork 25
When the bracket is attached to both ends 28b of the bracket body, the groove 34 formed in the front fork 25 is engaged with the protrusion 33a formed on the inner surface of the both ends 28b of the bracket body, and the bracket holder 28c is formed on the inner surface thereof. The projecting portion 33b is covered so as to be engaged with the groove of the front fork 25, and the bracket holder 28c is fixed to both end portions 28b of the bracket body by the bolt 32.

Due to the mounting structure as described above, the front fork 25 can be attached and detached in the front direction, and the front fork 25 can be easily attached and detached from the bracket 28.
Further, since it is not necessary to remove the front wheel 24 around the lower end of the front fork 25, maintainability and workability are improved.

Further, since the protrusions 33a and 33b and the groove 34, which are means for preventing the front fork 25 from coming off, are formed in the bracket 28 and the front fork 25, and these are engaged with each other, the front fork 25 comes off downward. On the other hand, the front fork 25 can be easily positioned in the vertical direction.

Furthermore, since the cap bolt 35 is merely a means for preventing oil leakage in the inner tube 27, there is no need to project the cap bolt 35 above the upper surface of the bracket 28, and the layout of the front portion of the vehicle body can be improved. There is no limit.

In the above embodiment, the bracket holder 28c is fixed to the both ends 28b of the bracket main body by the bolts 32, but as shown in FIG. 5, the stud bolts 140 are provided inside the both ends 128b of the bracket main body.
In advance, and attach the bracket holder 128c to the nut 1
It may be fixed by 41.

In the above embodiment, the groove 34 formed in the front fork 25 is engaged with the protrusions 33a, 33b formed on the inner surface of the bracket body both ends 28b and the inner surface of the bracket holder 28c. Although the front fork 25 was prevented from falling off, as shown in FIGS.
between the b and the bracket holder 228c.
0 may be provided, and the knock pin 240 may be locked in the pin groove 241 formed in the front fork 225 to prevent the front fork 225 from falling off.

Further, in the above-described embodiment, the example of the vehicle having only one bracket 28 such as the scooter type vehicle 11 is shown. However, as shown in FIG. 7, the bracket 328 is used.
Has an upper bracket 328A and a lower bracket 32.
It can also be applied to motorcycles separated into 8B. In this case, the present invention is applied to the lower bracket 328B, and when removing the front fork 325, after removing the cap bolt 335 on the upper bracket 328A, the bracket holder 328c of the lower bracket 328B is removed, and the inner fork of the front fork 325 is removed. The tube 327 may be pulled down once and then removed forward. By doing so, even in a motorcycle having a cowling 340 as shown in FIG. 8, the front fork 325 can be easily attached and detached without removing the cowling 340, and the maintainability and workability are improved.

[0031]

As described above, according to the front fork mounting structure for a motorcycle according to the present invention, the front fork mounting structure for mounting the front fork rotatably supporting the front wheel to the vehicle body through the bracket. In the above bracket, since the front fork is provided with means for attaching and detaching the front fork in the front direction, the front fork can be easily attached and detached from the bracket, and maintainability is improved.

Further, since the front fork drop-out preventing means is provided in the bracket, the cap bolt does not project upward from the upper surface of the bracket, and the layout of the front portion of the vehicle body is not restricted.

[Brief description of drawings]

FIG. 1 is a left side view of a scooter type vehicle showing an embodiment of a front fork mounting structure for a motorcycle according to the present invention.

FIG. 2 is a perspective view showing the vicinity of a front fork bracket.

3 (a) and 3 (b) are enlarged plan views of a portion of the bracket to which the inner tube is fixed and FIG.
Sectional drawing which follows the A line.

FIG. 4 is a view showing a mounting structure of a front fork to a bracket.

FIG. 5 is a plan view showing another embodiment for fixing the bracket holder to the bracket body.

6 (a) and 6 (b) are plan sectional views and BB showing another embodiment of the fall-out preventing means of the front fork.
Sectional drawing which follows the line.

FIG. 7 is a perspective view showing around the bracket of a front fork of a motorcycle in which the bracket is separated into an upper bracket and a lower bracket.

FIG. 8 is a front view of a motorcycle equipped with a cowling.

FIG. 9 is a perspective view showing an area around a bracket of a conventional front fork.

10A and 10B are an enlarged plan view and a cross-sectional view taken along line C-C of a portion of the conventional bracket to which the inner tube is fixed.

[Explanation of symbols]

11 Scooter type vehicle 23 Steering mechanism 24 Front wheel 25,225,325 Front fork 27,327 Inner tube 28,328 Bracket 28a Bracket main body 38b, 128b, 228b Both ends of bracket main body (means by which front fork can be attached / detached forward) 38c , 128c, 228c, 328c Bracket holder (means for attaching / detaching front fork in the front direction) 33a, 33b Projecting part (prevention mechanism for preventing front fork) 34 Groove part (prevention mechanism for preventing front fork) 35, 335 Cap bolt 128c Stud Bolt 141 Nut 240 Knock pin (fallout prevention means for other front forks) 241 Pin groove (fallout prevention means for other front forks)

Claims (2)

[Claims] 1. A front fork mounting structure for mounting a front fork for rotatably supporting a front wheel to a vehicle body via a bracket, wherein the bracket has means for detaching the front fork in a forward direction. Front fork mounting structure for motorcycles featuring 2. The front fork mounting structure for a motorcycle according to claim 1, further comprising: means for preventing the front fork from falling off inside the bracket.