Analysis of lubricating characteristics of valve plate pair of a piston pump. (October 2018)

• Record Type: Journal Article
• Authors: Wang, Zhaoqiang; Hu, Shan; Ji, Hong; Wang, Zhen; Liu, Xintian
• Is Part Of: Tribology international. Volume 126(2018)
• Page Start: 49
• Page End: 64
• Publication Date: 2018-10
• Subjects: Valve plate pair -- Friction -- Hydrodynamic -- Temperature; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2018.05.008
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: The wedge-shaped oil film thickness, pressure and temperature distribution of the valve plate pair of an axial piston pump were investigated using finite difference and relaxation iterative methods and lubrication characteristics for different working conditions and tilt and non-tilt states of the cylinder block were analysed for comparison. The oil film thickness changed when the cylinder block was tilted relative to the valve plate and produced hydrodynamic effects, increasing the carrying capacity. The structural parameter of the valve plate pair influenced lubrication characteristics. The temperature of the oil film increased and the temperature field was unevenly distributed owing to frictional power–related changes to heat energy. The simulated temperature and friction coefficient showed good agreement with measured values. Highlights: Wedge-shaped oil film is produced by the tilting of cylinder block relative to the valve plate, cause the hydrodynamic effect. Oil film pressure of the valve plate pair increased at the convergence region anticlockwise. Temperature of the oil film increased and unevenly distributed owing to the friction power changing to heat energy. Oil film thickness decreased with increase in the pressure and temperature. The simulation results were verified by experiment of friction and temperature.