A hydraulic shock absorber

Abstract

The invention discloses an oil damper. The oil damper comprises an oil storage cylinder, a piston assembly, a work oil cylinder, a bottom valve assembly, a guide assembly and a gland. The oil storage cylinder comprises an outer cylinder body barrel and a base. An oil storage cavity is formed between the work oil cylinder and the outer cylinder body barrel. The guide assembly is arranged at the rear end of the work oil cylinder. The end, away from a piston, of a piston rod of the piston assembly penetrates out of the guide assembly and the gland outwards, and the piston divides the work oil cylinder into a first cavity and a second cavity. The base is provided with a compressing damping regulation valve, the inlet of the compressing damping regulation valve is communicated with the first cavity, and the outlet of the compressing damping regulation valve is communicated with the oil storage cavity. The guide assembly is provided with a stretching check valve and a stretching damping regulation valve, the inlet of the stretching check valve is communicated with the oil storage cavity, the outlet of the stretching check valve is communicated with the second cavity, the inlet of the stretching damping regulation valve is communicated with the second cavity, and the outlet of the stretching damping regulation valve is communicated with the oil storage cavity. The bottom valve assembly is provided with a one-way check valve. The oil damper has the advantages that the stretching and compressing damping force can be symmetric or asymmetric, can be independently adjusted and can be externally adjusted.

Description

Technical field [0001] The invention relates to the technical field of vibration reduction of railway locomotives and vehicles, in particular to a hydraulic shock absorber. Background technique [0002] Railway locomotive oil pressure shock absorber is a key component of rail transportation equipment such as EMUs, electric locomotives, diesel locomotives, subway trains, etc. Its function is to reduce the vibration of rolling stock during the driving process, ensure the safety of rolling stock, and improve train comfort degree. [0003] The internal structure of hydraulic shock absorbers is generally divided into one-way oil circulation structure and two-way oil circulation structure. Single-cycle structure shock absorbers have symmetrical tensile and compression damping characteristics, and the symmetry cannot be changed by the damping control valve , The damping control valve of this structure is designed at the assembly of the guide and there is no need to disassemble the intern...

AI Technical Summary

Problems solved by technology

The shock absorber is a single-circulation structure of oil. There is an oil hole on the piston. A one-way valve plate is provided between the end face of the piston and the end face of the piston rod. When the piston rod is stretched and compressed, the oil must flow through the guide and then be The metal oil guide pipe guides the flow to the damping valve placed on the base, which can also be adjusted externally, but this structure is destined to only realize the symmetrical characteristics of the tension and compression damping forces, and the tension and compression damping forces cannot be adjusted externally separately, so when external adjustment is required Asymmetrical damping characteristics and tensile and compressive damping forces will be limited when they need to be adjusted separately. In addition, the structure is more complicated. One end of the metal oil guide tube is connected to the guide and the other end is connected to the base. The joints at both ends are sealed with O-rings. When assembling It is more troublesome, when the high-pressure oil discharged from the cylinder flows through the connection at both ends of the metal oil guide pipe, it is easy to cause leakage

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