JPH0585441A - Front fork of front and rear wheel-driven motorcycle - Google Patents

Abstract

PURPOSE:To provide a front fork for front and rear wheel-driven motor cycle in which a cover will not be made in contact with a drive shaft, etc. even if it is deformed by positioning the drive shafts at the front of a fork tube on one side of the front fork in parallel with each other and covering one fork tube and the drive shafts by a split tubular cover. CONSTITUTION:A gear case 19 is provided in the under bracket of a front fork, and a lower tube 17 is connected to the lower end of one fork tube 16 projected downward from the under bracket. A drive shaft 20 is provided at the front of the fork tube 16 in parallel with the tube 16, and its lower end is connected to a lower drive shaft 21. Then a tubular cover 22 split into right and left sides is suspended from the under bracket to cover one fork tube 16 and the drive shaft 20 by the cover 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front hawk of a front and rear wheel drive motorcycle.

[0002]

2. Description of the Related Art A front hawk of a motorcycle is rotatably attached to a head pipe at a front end of a frame, and a lower tube is slidably connected to the lower side of the left and right hawk tubes so as to be cushioned. Both ends of the axle that rotatably supports the front wheel are fastened to the lower end of the tube.
And, the parts where the lower tubes of the left and right hawk tubes slide are attached with a bellows cylindrical cover with an elastic body,
Is protected.

[0003]

In front-and-rear-wheel-drive motorcycles in which the front wheels are also driven by the engine, it is necessary to attach a front-wheel drive device to the front hawk. Then, if the drive shaft is provided side by side with the hawk tube on one side of the front hawk and covered with an elastic tubular cover, the cover becomes thick and the deformation is large, and there is a problem that it will rub against the drive shaft etc. is there.

In view of such a point, the present invention has a drive shaft arranged side by side on the front side of a hawk tube on one side of the front hawk, and the hawk tube on the one side and the drive shaft are covered with a two-part tubular cover. The objective is to obtain the front hawk of a front-rear wheel drive motorcycle that does not deform and hit the drive shaft.

[0005]

In order to achieve the above object, a front hawk of a front-rear wheel drive motorcycle according to the present invention is provided with a gear case in an under bracket of the front hawk, and has a gear case protruding downward from the under bracket. Side lower hawk tube is connected to the lower tube, the drive shaft is installed side by side on the front side of the hawk tube and the lower end is connected to the lower drive shaft. So, I covered the hawk tube and drive shaft part on one side.

[0006]

[Function] The cover has a cylindrical shape with an elliptical cross section, and is made by using hard synthetic resin or the like, which is divided into left and right parts and combined with screws. Since it is fastened by using, it is not deformed by a cushion such as a rubber boot and does not come into contact with the drive shaft or the like.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. Engine 2 mounted on the lower front of frame 1
Two sprockets 4 are mounted side by side on the output shaft 3, and one of them is connected to a rear wheel 6 by a chain 5 to drive the rear wheel. On the other hand, the other is connected via a primary chain 7 to a slip clutch or an overrun clutch 9 capable of absorbing the inner wheel difference when the front wheels 8 are steered. The secondary chain 12 is connected.

The front fork 10 is pivotally mounted so that the steering shaft 13 at the center of the upper portion can be pivoted left and right on the head pipe 14 at the front end of the frame 1 for steering. Front hawk 1
The left and right hawk tubes 16 are attached to the left and right of the 0 under bracket 15 so as to project downward, and the lower tubes 17 are connected to the lower sides of the left and right hawk tubes 16 so that they can be slid and cushioned. I am doing it. At the lower ends of the left and right lower tubes 17, both ends of an axle 18 rotatably supporting the front wheel 8 are fastened.

The under bracket 15 is provided with a gear case 19, which is gear-connected from the constant velocity joint 11 to a drive shaft 20 arranged side by side on the front side of the hawk tube 16 on one side. A lower drive shaft 21 that can slide is connected to the lower end of the drive shaft 20, and the lower drive shaft 21 is connected to the front wheels 8 via a gear so that the front wheels 8 are also driven by the engine 2.

The cover 22 is divided into left and right parts and is formed by combining a tubular member having an elliptical cross-section with a synthetic resin or the like, and is fastened with a screw so that the hawk tube 16 on one side and the drive shaft 20 are outside. Cover. Then, the upper end of the cover 22 is fastened to the lower surface of the under bracket 15 with a screw.

[0011]

As described above, since the present invention is configured as described above, the hawk tube on one side of the front hawk and the sliding portion of the drive shaft can be covered and protected by the cover. The cover has a tubular shape with an elliptical cross section and allows the hawk tube and the drive shaft to pass therethrough. Also, the cover can be made of hard synthetic resin etc. in a lightweight and inexpensive manner, and the upper end is fastened to the lower surface of the under bracket.
It will not be deformed and will not be rubbed against the drive shaft.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a front fork showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a main part of a front fork showing an embodiment of the present invention.

FIG. 3 is an enlarged side view of the cover portion of the front fork showing an embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of the cover portion of the front fork showing an embodiment of the present invention.

FIG. 5 is an overall side view showing an embodiment of the present invention.

FIG. 6 is a front view showing an embodiment of the present invention.

[Explanation of symbols]

 10 Front Hawk 15 Under Bracket 16 Hawk Tube 17 Lower Tube 19 Gear Case 20 Drive Shaft 21 Lower Drive Shaft 22 Cover

Claims (1)

[Claims] 1. A gear case is provided on the under bracket of the front hawk, a lower tube is connected to the lower end of the hawk tube on one side projecting downward from the under bracket, and a drive shaft is provided side by side on the front side of the hawk tube. Is connected to the lower drive shaft, and a cylindrical cover that is split left and right is hung on the lower surface of the under bracket, and the hawk tube on one side and the drive shaft portion are covered by the cover. Former Hawk.