A construction machinery hydraulic cylinder piston structure with two-stage throttling and buffering functions

Abstract

The invention discloses an engineering machinery hydraulic cylinder piston structure with a two-stage throttling buffering function, and belongs to the technical field of hydraulic cylinders. Five mounting grooves are formed in the outer circle of a piston; a main seal is installed in the installation groove at the middle position, guide rings are installed on two sides of the main seal, and a dirt containing ring is installed outside each guide ring; the shoulder on the outer side of each dirt containing ring is a first shoulder, the shoulder between each dirt containing ring and the corresponding guide ring is a second shoulder, and the shoulder between each guide ring and the main seal is a third shoulder; and each third shoulder includes a first-stage shoulder close to one side of thecorresponding guide ring and a second-stage shoulder close to one side of the main seal. According to the structure, the five mounting grooves are turned on the outer circle of the piston, the diameter size is gradually increased from the two outer sides to the middle to form a two-stage throttling annular gap, the two-stage throttling and buffering are carried out on the impact pressure on the two sides of the piston when a hydraulic cylinder operates at high speed and heavy load, and the use reliability of the hydraulic cylinder and the performance index of the peak value of the high impactpressure resistance are greatly improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic cylinders, in particular to a construction machinery hydraulic cylinder piston structure with a secondary throttling and buffering function. Background technique [0002] At present, the service life and average trouble-free working time of the high-speed and high-pressure construction machinery hydraulic cylinders typically represented by loader and excavator hydraulic cylinders in the market generally fail to reach the indicators of similar foreign benchmark products. The main feedback problem is that the main seal operates under long-term high speed and high pressure, and the impact pressure has a great impact on the service life of the piston main seal, resulting in internal leakage of the hydraulic cylinder and failure to use normally. [0003] The existing technology mainly includes the hydraulic cylinder (CN201218254Y) of the Chinese patent large excavator, which includes a cylinder body,...

AI Technical Summary

Problems solved by technology

The outer diameter of the piston is designed according to the extrusion gap of the piston seal of the conventional hydraulic cylinder. It is difficult to eliminate the periodically changing impact pressure, resulting in a short service life and poor reliability of the main seal, which cannot meet the current working conditions and usage of the main engine. life requirements

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