Damping force adjustment type buffer

Abstract

The invention relates to a damping force adjustment type buffer, capable of preventing the response delay of a pressure control valve and the self-excited vibration of the valve. The buffer controls the flow of the oil liquor between a ring oil line (21) and an oil storage chamber (4) generated by the slide of an inner piston of a hydraulic cylinder by a back pressure main valve (27) and a pressure control valve (28) to generate damping force. The direct damping force is generated by the pressure control valve (28) and the inner pressure of a back pressure chamber (53) is adjusted to control the valve opening pressure of the main valve 927). A valve spring (57) is mounted between a valve (56) and a plunger (34) in the pressure control valve (28) and the weight of the valve (56) is fully less than the weight of the plunger (34) and the spring rigid of the valve spring (57) is higher than the spring rigid of the plunger spring (36). Thus the response of the valve (56) is increased and the response delay of the damping force control is prevented. In addition, the natural frequency of the valve (56) is increased therefore the generation of the self-excited vibration is prevented.

Description

technical field [0001] The present invention relates to a damping force adjustable shock absorber mounted on a suspension device of a vehicle such as an automobile. Background technique [0002] The damping force adjustable shock absorber installed in the suspension device of the automobile is usually slidably embedded in the hydraulic cylinder sealed with oil, and the piston connected to the piston rod is slidably embedded, and the hydraulic cylinder is divided into two chambers. The damping force generating mechanism composed of a disc valve, etc. controls the flow of oil generated by the sliding of the piston in the hydraulic cylinder to generate damping force. The resistance changes, whereby the damping force is adjusted. [0003] As shown in Patent Document 1, a back pressure chamber is formed on the back of the disc valve, which is the damping force generating mechanism, and the back pressure chamber is connected to the hydraulic pressure on the upstream side via the ...

AI Technical Summary

Problems solved by technology

For example, when the damping force adjustable shock absorber is mounted on a suspension control device of a vehicle such as an automobile, and the damping force control is performed using a control signal from the controller according to the running state of the vehicle, due to the column of the pressure control valve (solenoid valve) Response delay due to inertia of the plug, etc., resulting in excessive damping force control, or noise due to self-excited vibration of the valve body of the pressure control valve

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