Abstract
In order to decrease the tilt and eccentric abrasion of a slipper and improve the lubrication performance of the slipper-swashplate interface in an axial piston pump, this paper proposes a comprehensive numerical simulation method to predict the lubrication performance and designs three types of slipper microstructures such as micro-chamfering, micro-filleting and micro-stepping to improve the lubrication performance. The lumped-parameter numerical pressure-flow model of the axial piston pump and the lubrication model of the slipper-swashplate interface have been developed. These models consider the pressure of slipper’s center oil pool, hydrostatic lubrication, hydrodynamic lubrication, slipper microstructures, slipper’s micro motion and dynamic equilibrium. The influence of slipper microstructures on the lubrication performance of the slipper-swashplate interface has been profoundly studied. Simulation results demonstrate that the slipper without a microstructure leans forward and finally touches the swashpate leading to wear-out and that all the three types of slipper microstructures improve the lubrication performance, where the effects of micro-chamfering and micro-filleting are better than the effect of the micro-stepping. With the increase of the micro-chamfering depth, the leakage decreases and the friction power loss increases, while with the increase of the micro-chamfering depth, the leakage increases and the friction power loss decreases. The experimental results are essentially consistent with the simulation results, which confirms the numerical models feasible and effective. The current work is significant for further designs and the structural optimization of the slipper-swashplate interface.
Highlights
The hydraulic fluid power system is widely employed in modern industrial fields [1]
According to the numerical simulation and experimental results, several conclusions are obtained as follow: (1) The simulation results demonstrate that the slipper without a microstructure overturns and touches the swashpate, resulting in eccentric abrasion
(2) The simulation results indicate that all three types of microstructures are conducive to the formation of the oil film lubrication
Summary
The hydraulic fluid power system is widely employed in modern industrial fields [1]. The swashplate type axial piston pump is the most common power hydraulic component. The certain oil film thickness needs to be formed to minimize the leakage and friction power loss for the sliding interface between the slipper and swashplate. Lubrication model of the slipper-swashplate interface, to analyze the thickness distribution, pressure distribution, temperature distribution and power loss of the oil film. Wieczorek and Ivantysynova [25] developed a CASPAR mathematical simulation tool, to predict the slipper’s tilt and the oil film pressure distribution of the slipper-swashplate interface in an axial piston pump. Kazama and Yamaguchi [21, 22] investigated the bearing characteristics and optimization design principles of the oil film at the slipper-swashplate interface in an axial piston pump. The friction power losses of the slipper-swashplate interface with different micro-chamfering widths are measured by experiments
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