Hydraulic cylinder and cushioning device of hydraulic cylinder

Abstract

The invention discloses a hydraulic cylinder and a cushioning device of the hydraulic cylinder. The cushioning device comprises a cushioning sleeve, a spring and an outer cushioning component, wherein a central hole is formed on the cushioning sleeve; the outer cushioning component is fixed with a cylinder body; a throttling oil passage is formed between an outer wall face of the cushioning sleeve and an inner wall face of the outer cushioning component; the cushioning sleeve and the outer cushioning component are in sliding fit in axial direction; the spring is positioned between the cylinder body and the cushioning sleeve; in a free state, an inner end of the cushioning sleeve extends into a hydraulic chamber of the hydraulic cylinder; and an inner end face of the cushioning sleeve can be in sealing fit with a cushioning blocking face of a piston. By the cushioning device provided by the invention, the fit of the outer wall face of the cushioning sleeve and the inner wall face of a guide sleeve is not required, and the phenomenon of blocking of the cushioning sleeve caused by displacement of the cushioning sleeve cannot be generated, so that damage to a fitting face of the cushioning sleeve and the outer cushioning component can be reduced or avoided, and the reliability and cushioning effect of the cushioning device are guaranteed.

Description

technical field [0001] The invention relates to a hydraulic cylinder buffer technology, in particular to a hydraulic cylinder buffer device, and also to a hydraulic cylinder including the hydraulic device. Background technique [0002] The hydraulic cylinder is a hydraulic component widely used in construction machinery; the basic action of the hydraulic cylinder is the telescopic movement of the piston relative to the cylinder body; during the working process, the piston continuously reciprocates relative to the cylinder body. When the piston rod is extended or retracted to the limit position, the end face of the piston will have a great impact on both ends of the cylinder; this impact will not only cause damage to the hydraulic cylinder, shorten the service life of the hydraulic cylinder, but also affect the engineering mechanical performance. For this reason, a buffer device capable of absorbing the impact of the piston on the cylinder body is generally provided in the h...

AI Technical Summary

Problems solved by technology

[0004] When using the existing buffer device, the premise of buffering the impact of the piston is to ensure the cooperation between the outer wall surface of the buffer sleeve and the inner wall surface of the guide sleeve; the matching dimensional accuracy and processing quality of the outer wall surface of the buffer sleeve and the inner wall surface of the guide sleeve directly affect the buffer sleeve. The cooperation between the outer wall surface of the guide sleeve and the inner wall surface of the guide sleeve; this cooperation can easily cause strain on the mating surface, which not only reduces the buffering effect of the buffer device, but also causes damage to the buffer device in severe cases; therefore, the existing buffer The reliability of the device cannot meet the actual needs

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