水压泵, 摩擦副, 热平衡, 间隙, 对偶材料

 Based on the thermal balance principle, an optimal clearance formula of piston friction pair for water hydraulic pump was proposed. Simulation and experimental research were put forward on its influence factors, such as the structure size, couple material and environmental parameters. The results are as follows：a minimum thermal clearance exists in each piston friction pair, which must be smaller than its initial clearance, otherwise it will happen to death; there are some effective measures to reduce the minimum thermal balance clearance, such as decreasing the plunger diameter or swash-plate tilt angle, choosing the appropriate couple material, reducing friction coefficient and fully running-in, etc.

water hydraulic pump, friction pair, thermal balance, clearance, couple material