Abstract: The floating cup pump as a new research object of the plunger pump, the friction and wear of valve plate limits its high efficiency development. The influence of bionic texture on the bearing characteristics of friction pair was studied by arranging regular bionic texture on the roller plate. Six different shapes of pit were selected to establish a 6-pit lubricating oil film model. Fluent software was used for numerical simulation to analyze the pressure distribution on the upper surface of oil film, the pressure formation mechanism and the influence of working condition parameters and texture parameters on the bearing capacity of the oil film. The research result shows that: The proportion of dynamic pressure is the largest in the bearing capacity of the upper surface of oil film, and spherical pit is most suitable for the design of textured valve plate surface of floating cup pump. The increase of rotational speed, area ratio and depth to diameter ratio are beneficial to the increase of dynamic pressure bearing capacity.

Key words: floating cup pump, valve plate, bionic pit, pressure distribution, bearing characteristics