A transient lubrication model has been developed for the sliding interface between the slipper and swashplate in axial piston hydraulic pumps and motors. The model considers a nonisothermal fluid model, microdynamic motion of the slipper, as well as pressure and thermal deformations of the bounding solid bodies through a partitioned solution scheme. The separate contributions of elastohydrostatic and elastohydrodynamic lubrication are studied. Although hydrostatic deformation dominates, hydrodynamic effects are crucial for actual operation. Finally, the impact of transient deformation on lubricant pressure is explored, with its consideration necessary for accurate analysis.
A new coupled multi-domain computer simulation model able of predicting axial piston hydraulic pump or motor performance is presented in this paper. The model is composed of different modules, each addressing different problems associated with the machine’s operation. A lumped parameter module calculates the instantaneous displacement chamber pressure. The second and major part of the model is dedicated to the lubrication of the three main pump sliding interfaces and considers the impact of elasto-hydrodynamic, thermal, and micro-motion effects on fluid film thickness. The final sub-model calculates the steady state temperature of the fluid in the pump housing and outlet port. Simulation results are compared to measurements taken of a commercially manufactured pump.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.