Guide sleeve dynamic pressure gap sealing type hydraulic cylinder

Abstract

The invention discloses a guide sleeve dynamic pressure gap sealing type hydraulic cylinder. The guide sleeve dynamic pressure gap sealing type hydraulic cylinder comprises a cylinder body, a piston,a piston rod, a guide sleeve, a gland and a cylinder cover; the surface of an inner hole of the guide sleeve is provided with inwards-concave grooves which are arranged in the circumferential direction of the guide sleeve in a penetrating manner, the inwards-concave grooves comprise annular oil grooves and V-shaped conical surfaces, and the V-shaped conical surfaces are symmetrically arranged andrelative to the annular oil grooves in a back and forth mode and comprise front conical surfaces and rear conical surfaces which are sequentially arranged from inside to outside; and the inner end surface of the gland is provided with a blind hole structure which is coaxially arranged with the gland and extends into the gland in the outer direction, the bottom of a hole of the blind hole structureis provided with a frustum structure which is coaxially arranged with the blind hole structure and extends out in the inner direction, the height dimension of the frustum structure in the front-reardirection is smaller than the depth dimension of the blind hole structure in the front-rear direction, and an oil transmission channel is formed between the inner end surface of the frustum structureand the outer end of the guide sleeve. The guide sleeve dynamic pressure gap sealing type hydraulic cylinder can effectively reduce leakage amount on the premise of ensuring liquid lubrication betweenthe guide sleeve and the piston rod.

Description

technical field [0001] The invention relates to a hydraulic cylinder, in particular to a guide sleeve dynamic pressure gap sealing hydraulic cylinder, which belongs to the technical field of hydraulic oil cylinders. Background technique [0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion), and is widely used in various mechanical hydraulic systems. [0003] A hydraulic cylinder usually includes a cylinder, a piston, a piston rod, a guide sleeve, a cylinder head and a sealing device. The guide sleeve supports and ensures the coaxiality of the piston rod and the cylinder. During the extension of the piston rod, the guide sleeve can make the The piston of the hydraulic cylinder is in surface contact with the inner surface of the cylinder barrel. The longer the stroke of the hydraulic cylinder, the longer the guide sleeve. The guide sleeve can also provide the instal...

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Problems solved by technology

However, the problem with this technical solution is that the static pressure oil chamber is almost sealed, and the oil inlet and outlet passages are only small arc-shaped gaps on the outer circle of the O-shaped seal. When the pressure increases or decreases, the oil in the oil chamber cannot Replenish or discharge in time according to the required pressure, the required sealing gap is difficult to change in time, which is very unfavorable for actual use

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