Two types of variable-displacement, hydraulic pumps were compared on the basis of overall torque and volumetric efficiencies, and volumetric losses due to external case leakage, and internal slip leakage. The bent-axis pump had the greater overall efficiency at 3,000 p.s.i. and below, for nearly all speeds and displacements. The swashplate pump was more efficient above 3,000 p.s.i. at lower displacements. Possible reasons for the differences in efficiency are given in the paper. A factorial experiment was also run on the swashplate pump to test the significance of the effects of the variables and the reliability of test results.
展开▼
