To improve the efficiency of rod oil pumps,a new type of multistage,doubleaction roller rotary oil pump was put forward.In the pump rolling friction pairs are used to replace the conventional sliding friction ones and that cause a lower friction loss.A structure of multiple stages in series was adopted to raise discharge pressure greatly.Meantime a doubleaction structure in the inlet and outlet chamber was applied to get the radial force on the rotor balanced.Through analysis of forces applied on a roller in the pump,a force equilibrium equation was established.Based on the principle of minimum sliding friction,an optimal slot width was determined precisely by means of a computer code composed.By analyzing the rolling condition of a roller,the equilibrium equation of frictional moments on the roller surface was deduced,and considering the principal of optimal gap between two flat plates,eventually,a formula for determining the optimal gap between the roller and the valve plate was deduced.For a design example,such an optimal gap was calculated.As the gaps were 0.044 399 mm and 0.055 975 mm,respectively,the forces applied on rollers will be relief and the leakage will be reduced,subsequently the pump overall efficiency will be improved.The method proposed in the article comes up with a theoretical trial for determining,optimizing and choosing the gap to the pump.
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