JPS6220392Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for a hydraulic shock absorber used in motorcycles and the like.

In motorcycles, hydraulic shock absorbers are used to reduce the shocks that occur when the vehicle is traveling, but the front forks (front wheel suspension) in particular sink significantly when braking, so a device such as the one shown in Fig. 1 (anti-nose dive mechanism) is provided to suppress this. That is, A and B are oil passages leading to the front forks, C is a valve that opens and closes the oil passages A and B, D is an oil passage where brake hydraulic pressure acts, E is a piston that operates by the brake hydraulic pressure, and E is a spring interposed between the valve C and the piston E, and when braking is not being applied, the spring F is pulled down by the rise in hydraulic pressure generated in the front forks.
Valve C is opened against this, and as shown in the figure, oil passages A and B are connected, oil flows in the direction of the arrow, and the front forks stroke normally.

When braking is applied, brake oil pressure is applied from the oil passage D as shown in Figure 2, so the piston E moves in the direction of the arrow as shown in the figure and strongly presses the valve C via the spring F, causing the oil to flow out. Locks continuity between passages A and B. In this way, the front forks are prevented from sinking during braking. However, by providing such a device, brake oil is used not only for the caliper but also for this device, which has the disadvantage that the stroke of the brake lever increases.

The present invention has been devised in view of the above circumstances, and aims to eliminate the drawbacks of the conventional devices and provide a control device for a hydraulic shock absorber that does not use brake oil pressure.

The present invention provides an on-off valve in a first oil passage through which hydraulic pressure of a hydraulic shock absorber is conducted, a piston is provided corresponding to the on-off valve, and the on-off valve is attached between the on-off valve and the piston in the closing direction. In the control device for a hydraulic shock absorber, a control device for a hydraulic shock absorber is provided with a spring that presses the opening/closing valve as the piston moves, thereby locking the open/close valve through the spring. A second oil passage is provided in which the oil pressure is conducted, and another valve that opens and closes in conjunction with the brake lever is interposed in the oil passage, and when braking, the valve is actuated by operation of the brake lever to supply the second oil. The passage is opened, hydraulic pressure from the hydraulic shock absorber is introduced to move the piston against the pressing force of the spring, and the piston and spring press the opening/closing valve to close the first oil passage. This is a control device for a hydraulic shock absorber characterized by being configured as follows.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Fig. 3, 1 is the front fork body,
2 is the control device body, 3 is the cover of the device, 4, 5
1 is a first oil passage, 6 is a valve that opens and closes these oil passages, 7 is an oil chamber provided on the side of the valve, 8 is another oil chamber, 9 is a piston that slides inside the oil chamber 8, 1
0 is a spring receiver provided on piston 9, 11
12 is a second spring which is interposed between the spring receiver 10 and the valve 6 and biases the valve 6 in the closing direction; and 12 is a second spring which connects the oil chamber 7 and the oil chamber 8.
13 is a valve that opens and closes the second oil passage 12; 14 is a spring that acts on the valve 13 to keep the second oil passage 12 normally closed; and 15 is a brake lever that is interlocked with the valve 13.

When the brake is not applied, the valve 13 closes the second oil passage 12, and the increase in oil pressure caused by compression of the front fork is transferred to the first oil passage 4.
It is not transmitted from the oil chamber 8 to the oil chamber 8. Therefore, since the valve 6 is pushed out only by the pressing force (initial load) of the spring 11, when the increased hydraulic pressure acts on the oil chamber 7, it overcomes the pressing force of the spring 11 and moves the valve 6 in the direction of arrow a. The front fork strokes normally as oil flows from the oil chamber 7 to the first oil passage 5 as shown by the arrow.

During braking, the valve 13 moves to the second position in conjunction with the operation of the brake lever 15, as shown in FIG.
The oil passage 12 is opened, the oil chamber 7 and the oil chamber 8 are electrically connected, and both chambers have the same pressure. Therefore, when the front fork is compressed, the oil pressures in the oil chambers 7 and 8 rise simultaneously. The piston 9 in the oil chamber 8 moves in the direction of arrow b against the pressing force of the spring 11, so that the pressing force to close the valve 6 is strengthened. Therefore, the flow of oil from the front fork to the first oil passage 5 is strongly blocked, and the front fork is prevented from sinking.

In addition, when braking, if the oil pressure suddenly increases after driving over an uneven road surface, the oil pressure acting on the oil chamber 7 will be applied to the piston 9 pushing the valve 6.
(that is, the oil pressure in the oil chamber 8 x the cross-sectional area of the piston 9), the valve 6 opens and the oil in the oil chamber 7 flows into the first oil passage 5. Note that the opening pressure of the valve 6 in response to such a sudden increase in oil pressure may be adjusted by the stroke of the piston 9.

As described above, according to the present invention, the valve 6 of the control device is controlled by the hydraulic pressure from the front fork without using the brake hydraulic pressure, so that the brake that occurs during braking in the conventional device is reduced. The problem of increased lever stroke can be solved.

Furthermore, since the stroke of the brake lever is shortened compared to conventional devices, quick braking in response to the operation of the brake lever is guaranteed.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the conventional device;
4 and 4 are explanatory diagrams of the control device according to the present invention. 1...Front fork body, 4, 5...1st
Oil passage, 6... Valve, 8... Oil chamber, 9...
Piston, 11...spring, 12...second oil passage, 13...valve, 15...brake lever.

Claims (1)

[Scope of utility model registration request] An on-off valve is provided in a first oil passage through which hydraulic pressure of the hydraulic shock absorber is conducted, a piston is provided corresponding to the on-off valve, and a spring is provided between the on-off valve and the piston to bias the on-off valve in a closing direction. In the control device for a hydraulic shock absorber, the control device is configured to lock the opening/closing valve by pressing it via a spring as the piston moves, wherein hydraulic pressure from the hydraulic shock absorber is applied to the back of the piston. providing a second oil passage that conducts;
Another valve that opens and closes in conjunction with the brake lever is interposed in the oil passage, and when braking, the valve is actuated by the operation of the brake lever and the second valve is opened and closed in conjunction with the brake lever.
The oil passage is opened, hydraulic pressure from the hydraulic shock absorber is introduced to move the piston against the pressing force of the spring, and the piston and spring press the opening/closing valve to close the first oil passage. A control device for a hydraulic shock absorber, characterized in that it is configured to: