Piston mechanism and hydraulic shock absorber

Abstract

The invention relates to the technical field of shock absorbers, in particular to a piston mechanism and a hydraulic shock absorber. The piston mechanism comprises a piston rod, an electromagnetic valve assembly, a sliding valve and a rebuilt valve system, the piston rod is inserted into a working cylinder of the hydraulic shock absorber, the two ends of the electromagnetic valve assembly are connected with the piston rod and the rebuilt valve system respectively, the rebuilt valve system divides the working cylinder into a rod cavity and a rodless cavity, the sliding valve is located in a containing cavity formed by the rebuilt valve system and the electromagnetic valve assembly and divides the containing cavity into a first cavity and a second cavity, when the electromagnetic valve assembly is electrified, a first valve port and a second valve port of the electromagnetic valve assembly communicate, so that the first cavity communicates with the rod cavity through the electromagnetic valve assembly, a second through hole used for communicating the second cavity with the rod cavity is formed in the side wall of the second cavity, and the slide valve can shield the second through hole. The pressure of the first cavity is adjusted by adjusting the opening degree of the electromagnetic valve assembly so that the opening degree of the sliding valve can be adjusted, and then the damping force generated when oil passes through the rebuilt valve system can be adjusted.

Description

technical field [0001] The present application relates to the technical field of shock absorbers, in particular to a piston mechanism and a hydraulic shock absorber. Background technique [0002] Hydraulic shock absorbers are commonly used in automobile suspension systems. During the working process of the shock absorber, the piston rod will reciprocate in the working cylinder of the shock absorber, and the oil in the oil storage cylinder will generate damping force through the valve system; the conventional electromagnetic The damping force of the valve is fixed, and the damping force of the shock absorber cannot be automatically controlled, so the electronically controlled shock absorber came into being. [0003] At present, the main electronically controlled shock absorbers are electronically controlled shock absorbers with external solenoid valves. The solenoid valves are placed outside the shock absorbers, and the control of the damping force is realized by controlling ...

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Problems solved by technology

[0002] Hydraulic shock absorbers are commonly used in automobile suspension systems. During the working process of the shock absorber, the piston rod will reciprocate in the working cylinder of the shock absorber, and the oil in the oil storage cylinder will generate damping force through the valve system; the conventional electromagnetic The damping force of the valve is fixed, and the damping force of the shock absorber cannot be automatically controlled, so the electronically controlled shock absorber came into being

[0003] At present, the main electronically controlled shock absorbers are electronically controlled shock absorbers with external solenoid valves. The solenoid valves are placed outside the shock absorbers. By controlling the size of the oil circuit in the bypass passage, the control of the damping force is realized; The diameter of the oil storage cylinder is designed to be large, which is not conducive to the layout of the chassis. At the same time, the layout of the external solenoid valve also increases the difficulty of the space layout of the chassis suspension of the vehicle, and the external solenoid valve also increases the weight of the product, which virtually increases the weight of the vehicle.

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