The Friction and Wear Properties of the Spherical Plain Bearings with Self-lubricating Composite Liner in Oscillatory Movement

摘要

A test method based on the condition simulation and a friction and wear test machine fecturing oscillatory movement were set up for self-lubricating spherical plain bearings ( SPB).In the machine the condi-tion parameters sueh as load, angle and frequency of oscillation and number of test cycles can be properly con-trolled. The data relating to the tribological properties of the bearing, in terms of friction coefficient, linear wearamount, temperature near friction surface and applied load, can be monitored and recorded simultaneoasly dur-ing test process by a computerized measuring system of the machine. Efforts were made to improve the measurementtechnology of the friction coefficient in oscillating motion. In result, a well-designed bearing torque mechanismwas dzveloped, which could reveal the relation between the friction coefficient and the displneemeat of oscillatingangle in any defined cycle while the curve of friction coefficient vs number of testing cycles was eontinuolusly plotted.The tribologieul properties and service life of four kinds of the bearings, i, e, the sample Ⅰ-Ⅳ with different selffilubricating composite liners, iacluding three kinds of palytetrafluoroethylene (PTFE )fiber weave/epoxy resincomposite liners and a PTFE plasticl copper grid composite liner, were evaluated by testing, and the wear mecha-nisms of the liner materials were analyzed.