JPS58149875A - 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 The present invention relates to a front fork for suspending a front wheel of a two-wheeled vehicle or the like on the vehicle body side, and more particularly to a front fork that allows the vehicle height to be adjusted without changing the damping characteristics.

The height of a motorcycle or the like has been adjusted by adjusting the set length of the cushion spring of the front fork or the pressure of the filled gas.

However, when adjusting the vehicle height using this method, τ is inevitably accompanied by a change in the damping characteristics, which not only makes it impossible to obtain an appropriate damping characteristic, but also complicates the adjustment device and makes adjustment cumbersome and difficult. Ta.

In view of the above-mentioned problem in adjusting the vehicle height of the front fork, the present inventor created the present invention to effectively solve the problem. A rod is rotatably inserted between the upper end cap of the sliding pipe and the upper end cap of the inner cylinder, and the rod is screwed onto the upper end cap of the inner cylinder, thereby improving the cushioning properties. To provide a front fork that can easily adjust the vehicle height without making any changes, and can simplify the vehicle height adjustment mechanism.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The drawing is a longitudinal cross-sectional side view of the upper part of the front fork 1 according to the present invention. In the drawing, 2 is an inner cylinder, and the inner cylinder 2 is slidably fitted into an outer cylinder (not shown). is filled with hydraulic oil.

A fork bolt 3 is fixed at an intermediate position on the inner circumference of the inner cylinder 2 with a stopper ring 4, and an upper end I of the inner cylinder 2
/CII'i cap 5 is screwed on, while this 2
A pulp (not shown) that generates a damping force is provided below. Note that the cap 5 is provided with a ventilation hole 5a.

A cushion spring 6 is stretched between the fork bolt 3 in the inner cylinder 2 and the outer cylinder, and the hydraulic oil sealed inside flows through the valve due to the relative expansion and contraction movement between the inner cylinder 2 and the outer cylinder. As is well known, a necessary damping force is generated in the front fork 1 due to oil flow loss during this time.

By the way, a sliding pipe 8 is connected to the upper outer periphery of the inner cylinder 2 via ring-shaped guide bushings 7.7 fitted above and below the inner periphery.
are fitted in a slidable manner, and an upper bracket 9 and an under bracket 10 are arranged above and below the outer periphery of the sliding pipe 8.
are fitted respectively. A cap 11 is screwed onto the upper end of the sliding pipe 8, and a dust boot 12 is interposed between the outer periphery of the lower end of the cap 11 and the outer periphery of the upper end of the outer cylinder so as to cover the sliding part of the inner cylinder 2 from the outside. ing.

On the other hand, a rod 16 is rotatably inserted between the cap 11 of the sliding pipe 8 and the cap 5 of the inner tube 2 as shown in the figure. This rod 16 is screwed into the cap 5,
A stopper 1 is provided at the lower end projecting downward from the cap 16.
4 is fixed with a nut 15. On the other hand, rod 13
A handle 16 is fixed with a nut 17 to the upper end projecting upward from the cap 11.

The sliding pipe 8 is connected to the vehicle body through an upper bracket 9 and an under bracket 10 provided on its outer periphery, and the lower end of the outer cylinder is connected to the wheel side.

Next, vehicle height adjustment in the front fork 1 will be explained.

The drawing shows a state in which the vehicle height is adjusted to the maximum, but if the rod 16 is rotated in a predetermined direction using the handle 16 from this state, the rod 13 is screwed into the cap 5, so the cap 5 Proceed downward through it. With this downward movement of the rod 13, the sliding pipe 8 moves along the outer circumference of the inner cylinder 2.
As the sliding pipe 8 moves downward, the vehicle body connected to the sliding pipe 8 via brackets 9 and 10 also moves downward, and the vehicle height is adjusted lower.

The vehicle height adjustment described above is possible until the lower end of the rod 13 comes into contact with the upper end of the fork bolt 3, and therefore the vehicle height adjustment range is within the range indicated by Δh in the drawing.

In order to adjust the vehicle height higher from such a state, the rod 13 may be rotated in the opposite direction using the handle 16 to move the rod 13 upward.

Furthermore, since the chamber S formed between the cap 5 and the 7-octane bolt 3 in the inner cylinder 2 is always in communication with the atmosphere through the ventilation hole 5a, the air in the chamber S is released as the rod 13 moves up and down. flows through the ventilation hole 5a, and therefore the rod 13 can move up and down smoothly without resistance.

In the above vehicle height adjustment, since the set length of the spring 6 is kept constant, the shock absorbing characteristics of the front fork 1 are not affected in any way by the vehicle height adjustment, which is advantageous.

Furthermore, the vehicle height adjustment mechanism is simply composed of a sliding pipe 8, a cap 5, 11, a rod 13, a handle 16, etc., and the vehicle height can be adjusted simply by operating the handle 16 and rotating the rod 16. , adjustment work becomes easier and faster.

As is clear from the above description, according to the present invention, a sliding pipe is slidably fitted to the upper outer periphery of the inner cylinder, and a rod is slidably fitted between the upper end cap of the sliding pipe and the upper end cap of the inner cylinder. Since the rod is inserted into the inner cylinder and screwed onto the upper end cap of the inner cylinder, the vehicle height can be easily adjusted without changing the shock absorbing characteristics of the front fork, and the vehicle height adjustment mechanism is simplified. can be achieved.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional side view of the upper part of a front fork showing an embodiment of the present invention. In the drawings, 2 is an inner cylinder, 5 and 11 are caps, 6 is a cushion spring, 8 is a sliding pipe, 16 is a rod, and 16 is a handle.

Claims (1)

[Claims] In a front fork formed by slidably fitting an inner cylinder and an outer cylinder, a sliding pipe is slidably fitted to the upper outer periphery of the inner cylinder, and a cap and a cap fixed to the upper end of the sliding pipe are provided. A front fork characterized in that a rod is rotatably inserted between caps fixed to the upper end of the inner cylinder, and the rod is screwed onto the cap of the inner cylinder.