Bimetal cylinder block, friction pair and machining method for axial variable piston pump

Abstract

The invention relates to a bimetal cylinder block, a friction pair and a machining method for an axial variable piston pump. A matrix of the cylinder block is made of a ductile cast iron material, thevalve surface of the cylinder block is made of a copper alloy material, a copper alloy is fused to the valve surface of the cylinder block through fusion welding, nitrocarburation is adopted in the heat treatment of the matrix, and an effective wear-resistant layer is formed in the surface of a cylinder block piston plug hole. According to the technical scheme of the bimetal cylinder block, the friction pair and the machining method, the wear problem of the original plane friction pair is solved. After long-term use, the copper alloy plane of the cylinder block and the friction surface of a valve plate have no obvious damage or abnormal wear, the plane valve effect is significantly improved, the service life is significantly prolonged, and the service life of the pump is significantly prolonged.

Description

technical field [0001] The invention relates to the technical field of variable displacement plunger pumps, in particular to a bimetallic cylinder body, a friction pair and a processing method for an axial variable displacement plunger pump. Background technique [0002] The axial variable piston pump is an important part of the hydraulic system. A few years ago, the fan variable pump of an amphibious armored assault vehicle was officially produced and provided in batches. With the development of technology and the improvement of equipment precision, the precision of the axial variable piston pump is getting higher and higher. However, because the fan variable pump uses Poor working conditions, high pressure, high speed and long continuous working time reduce the service life of the pump. After analysis, it is found that the abnormal wear and damage of the plane friction pair of the cylinder block and the valve plate are the main reasons. [0003] The cylinder body is a ro...

AI Technical Summary

Problems solved by technology

[0003] The cylinder body is a rotary part with high hardness. When the pump is running, the cylinder body rotates at a high speed, and the plunger reciprocates in the cylinder body, continuously absorbing and pressing oil, and the high pressure of the pressure oil chamber acts on the cylinder through the plunger. On the body, it is very easy to cause eccentric wear of the cylinder block and the valve plate

While distributing oil in and out, the valve plate must bear the eccentric load of the cylinder due to the tilting moment during operation. Because the material of the valve plate is low in hardness, the plane is easy to wear and scratch, and the joint surface between the valve plate and the cylinder body becomes uneven. , increased wear and tear, eventually leading to damage to the valve plate plane, reduced pump volumetric efficiency, increased temperature of the plunger pump, and even burned out the plunger pump

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