A Prediction Method of Slipper Pair Eccentric Wear Based on Non-uniform Clearance Oil Film

Abstract

The invention provides a slipper pair eccentric-wear wearing model based on a non-uniform gap oil film, and relates to the field of axial-piston-pump slipper pair friction lubrication. According to the model, eccentric-wear characteristics of a slipper and non-uniformity distribution of the lubrication oil film are considered on the basis of an abrasive wearing model based on two-dimensional parallel planes; an idea of discrete solving on the eccentric-wear lubrication oil film of a slipper pair is adopted, the oil film of the non-uniform distribution is divided into multiple small oil film intervals of which distribution can be approximated as parallel distribution, individual solving of the amount of parallel wearing is carried out on each interval, and then a double-integral idea is adopted to carry out extension to an entire slipper bottom surface to obtain the amount of total wearing by solving; and finally, curvilinear integral is carried out along an elliptical motion trajectoryof the slipper on a swashplate surface to obtain the amount of eccentric-wear wearing of the slipper pair in a unit cycle by solving, and the mounts of eccentric-wear wearing of the piston-pump slipper pair under different working conditions are obtained at the same time through fully digital simulation calculation. Results show that for a piston pump working under working conditions of high speed / low pressure / small displacement for a long period, the amount of wearing of the slipper pair can be decreased, and service life of the pump can be improved.

Description

technical field [0001] The invention relates to the field of friction lubrication of sliding shoe pairs of axial piston pumps, in particular to a method for predicting eccentric wear of sliding shoe pairs based on non-uniform gap oil film. Background technique [0002] Wear is one of the main failure modes of axial piston pumps. Wear will lead to the destruction of the lubricating oil film of the friction pair and increased leakage, which will lead to a decrease in pump efficiency and affect the remaining effective service life of the pump. Because the amount of wear is difficult to measure in real time, it is difficult to determine the factors affecting the wear of hydraulic pumps and to predict the wear state. [0003] Slipper pair wear failure is one of the most prone failures of swash plate axial piston pumps, especially under high-speed operating conditions, the leakage caused by the sliding shoe pair accounts for the vast majority of the total leakage of the casing. T...

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Problems solved by technology

[0004] In the prior art, an accelerated life test method for slipper pairs of axial piston pumps based on the Elastohydrodynamic Lubrication (EHL, Elasto Hydrodynamic Lubrication) wear model is disclosed, which regards the two opposing friction surfaces of the slipper pair as two Friction and wear between parallel planes, however, in fact, the lubricating oil film of the shoe pair is usually unevenly distributed, and the resulting wear between the shoe and the swash plate should be a form of eccentric wear

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