| 摘要 |
The spherical piston pump comprises an outer stator and an inner rotor rotatable on a control pintle provided with supply and discharge channels. The rotor contains at least one radial bore in which is slidable a spherical piston including an outer ball, a cylindrical sleeve and an inner ball. The outer ball, sleeve and inner ball are not fastened to one another and can be replaced independently of each other. Annular sliding members made of low-friction and sound-damping material can be integrated into the ends of the sleeve, each of the sliding members being in line contact with the associated one of the two balls. The construction provides good volumetric efficiency even at high pressure and an improved overall efficiency of the pump.
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