Clearance compensation type annular oil groove sliding shoe for plunger hydraulic pump

Abstract

The invention relates to a clearance compensation type annular oil groove sliding shoe for a plunger hydraulic pump. The clearance compensation type annular oil groove sliding shoe comprises a sliding shoe body, one end of the sliding shoe body is provided with a ball socket trapezoidal groove and a sliding shoe ball socket, and the other end of the sliding shoe body is provided with an end face which is in contact with an oblique plate. A concave annular groove with a damping hole is formed in the middle of the end face, two communicated oil channels which are perpendicular to each other and are crossed are formed in the sliding shoe body, and the communicated oil channels are vertically communicated with the damping hole. Four auxiliary supporting cavities are evenly distributed around the concave annular groove in the end face, each auxiliary supporting cavity is provided with a damping hole which is vertically communicated with the communicated oil channels, one ends of the communicated oil channels are communicated with the auxiliary supporting cavities, and the other ends of the communicated oil channels are matched with screw plugs to form sealing assemblies. In the working process, oil liquid is led into the communicated oil channels through the damping holes, and at last flows into the concave groove and the auxiliary supporting cavities to form auxiliary static pressure bearing. The clearance compensation type annular oil groove sliding shoe can achieve automatic compensation of the sealing clearance between a sliding shoe pair, reduces the friction force of the sliding shoe and the oblique plate, and is convenient to machine and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of hydraulic components of mechanical engineering, and relates to a sliding shoe for a plunger type hydraulic pump, in particular to a clearance compensation annular oil groove sliding shoe for a plunger type hydraulic pump. Background technique [0002] The sliding shoe is one of the most critical parts in the plunger pump, and the structural design of the sliding shoe directly affects the wear and tear failure of the plunger pump. Therefore, an effective supporting lubricating film needs to be formed between the sliding shoe and the swash plate of the plunger hydraulic pump, so as to reduce the wear of the sliding shoe and the swash plate, increase the service life of the sliding shoe, and improve the volumetric efficiency of the pump at the same time. Therefore, the structural design of the sliding shoe has an important influence on the volumetric efficiency and service life of the plunger hydraulic pump....

AI Technical Summary

Problems solved by technology

[0007] 1. There is an oil pool on the end surface of the shoe (joint surface with the swash plate), and the force distance between the support force of the swash plate on the end surface of the shoe and the force exerted by the ball head on the ball socket is relatively large, and the strength of the center cavity of the shoe Therefore, during the plunger oil pressure stroke, the hydraulic pressure at the bottom of the plunger causes the plunger ball head to exert a greater force on the ball socket of the shoe, which causes the shoe to deform and cause the shoe to loosen.

[0008] 2. The sliding shoe is prone to tilt during the working process, and the wedge-shaped gap formed between the sliding shoe and the swash plate is likely to cause a large leakage between the sliding shoe and the swash plate, resulting in a lack of oil input from the plunger cavity in the oil pool of the sliding shoe , the end face of the sliding shoe is eccentrically worn, which is prone to shoe burning, and the volumetric efficiency of the plunger pump is significantly reduced

[0009] 3. The processing accuracy of the ball socket surface of the sliding shoe is high, so it is difficult to fully bond the inner spherical surface of the sliding shoe with the outer spherical surface of the plunger ball head, the contact specific pressure is high, and the local wear is intensified

Although the structure described in the above-mentioned patent has improved the wear resistance, anti-overturning ability and reduced internal leakage of the slide shoe, it cannot completely solve the internal leakage, Eccentric wear and gap compensation sealing issues

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