JPS6113428Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an anti-nose dive mechanism in a trailing arm type front cushion of a two-wheeled vehicle.

Generally, as a characteristic of a shock absorber of a front cushion of a motorcycle or the like, the damping force is small during the extension process. Therefore, during braking, the front cushion is rapidly compressed by the inertial force of the rider's weight, causing the steering wheel to sink by that amount, resulting in a so-called nose dip phenomenon that significantly impairs steering stability.

As shown in Fig. 1, in the trailing arm type front cushion 1, when braking, the shock absorber 1
The support shaft 2 will be lowered by the amount that is compressed,
The handle will sink down by the amount of downward movement.
Therefore, in order to eliminate this difficulty, we developed an anti-nose dive mechanism that works in conjunction with the braking mechanism to increase the damping force against compression of the front cushion during braking, thereby preventing the front cushion from sinking. It was hoped that it would be installed in the cushion.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a trailing arm type front cushion having anti-nose dive characteristics and excellent handling stability.

FIG. 2 is a longitudinal sectional view of the embodiment of the present invention, and the third
The figure is an enlarged view of the main parts. In this invention, the inner cylinder 3
and an outer cylinder 4 are fitted together coaxially, oil reservoir chambers 5 and 6 are formed inside them and filled with an appropriate amount of oil 7, and a piston 8 is slidably provided inside the inner cylinder 3. This constitutes a hydraulic shock absorber. This hydraulic shock absorber 1 has an upper portion fixed to a vehicle body and a lower portion fixed to a link 9 via mounting fittings 10 and 11, respectively.
Further, a bottom piece 13 having a hollow portion 12 inside is fitted to the bottom of the inner cylinder 3, and the bottom piece 1
3 is provided with an oil hole 14 communicating between the inner cylinder oil reservoir chamber 5 and the cavity 12 and an oil passage 15 communicating between the cavity 12 and the outer cylinder oil reservoir chamber 6. Note that 22 is a joint that closes the end of the outer cylinder 4.

On the other hand, a check valve 18 is mounted on the upper surface of this oil hole 14 by a circlip 16 via a disc spring 17, and this check valve 18 is opened during the extension process. Further, in the center of the bottom piece 13, an oil passage 19 is axially bored through which the inner cylinder oil chamber 5 and the cavity 12 are constantly connected.

On the other hand, the lower end of the rod 20 extends from a joint 22 that closes the end of the outer cylinder, and has a ring-shaped member 20' protruding from its outer periphery, and is interlocked with a wire connected to the brake, so that the rod 20 slides upward during braking. The upper end surface of the rod closes the oil passage 19 in the center of the bottom piece. In addition, Rod 2
Ring-shaped member 20' and joint 22 at the outer periphery of
Since a small spring 21 is installed between the rod 20 and the lower surface of the rod 20, the rod 20 quickly returns to its original position when the brake is released.

According to the shock absorber according to the present invention, when a motorcycle or the like is in a normal running state, the check valve 18 closes and the oil hole 14 is closed during the front cushion compression process, so that the oil in the inner cylinder oil reservoir chamber 5 is is bottom piece 13
A damping force is generated by passing through only the oil passage 19 in the center of the front cushion, and then flows through the cavity 12 and the oil passage 15 into the oil reservoir chamber 6 in the outer cylinder.Now, when a braking force is applied to this front cushion, the damping force is generated. Due to the inertial force of the rider's weight, the front cushion tends to sink as in the compression process, but the rod 20 fitted to the bottom of the outer cylinder 4 that interlocks the front brake slides upwards. Since the upper end surface closes the oil passage 19 in the center of the bottom piece 13, and the check valve 18 is also closed, the flow of oil from the inner cylinder oil reservoir chamber 5 to the outer cylinder oil reservoir chamber 6 is prevented. That flow path is cut off,
This will prevent the piston 8 from sinking.

As described above, according to the present invention, when a large load is applied to the handlebar of a motorcycle due to inertia caused by braking, the front cushion sinks with resistance, preventing nose dive and providing excellent handling stability. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is an installation diagram of an embodiment of the present invention, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is an enlarged view of the main parts. 1...Front cushion, 2...Spindle, 3...
...Inner cylinder, 4...Outer cylinder, 5...Inner cylinder oil reservoir chamber, 6...
...Oil reservoir chamber in outer cylinder, 7...Oil, 8...Piston, 9
...Link, 10, 11...Mounting bracket, 12...
...Cavity part, 13...Bottom piece, 14...Oil hole, 15, 19...Oil passage, 16...Circuit, 17...Disc spring, 18...Check valve, 20...
Rod, 21...Kobane.

Claims (1)

[Scope of utility model registration request] An inner cylinder and an outer cylinder are fitted coaxially, a piston is slidably provided in the inner cylinder, and the piston rod of the piston extends from the top of the outer cylinder to the vehicle body, and the bottom of the outer cylinder is connected to the link. Attachment, an oil reservoir chamber is formed in the inner and outer cylinders, a bottom piece having a cavity inside is fitted to the bottom of the inner cylinder, and the bottom piece has an oil reservoir chamber in the outer cylinder and the cavity. A central oil passage and an oil hole are provided in the axial direction to connect the inner cylinder oil reservoir and the cavity, and the oil hole is provided with a non-return check that closes during the compression process. In a hydraulic shock absorber equipped with a valve, a rod that is slidable in the axial direction is fitted into the center of the bottom of the outer cylinder, the lower end of which extends from a joint that closes the end of the outer cylinder, and a ring-shaped member is bored around the outer circumference of the rod. At the same time, by interlocking with a wire connected to the brake and sliding the rod upward during braking, the upper end of the rod closes the oil passage in the center of the bottom piece, and there is a gap between the ring-shaped member and the joint. An anti-nose die mechanism for a trailing arm type front cushion for motorcycles, etc., which is equipped with a small spring to return the rod to its original position when the brake is released.