Characteristics of Displacement Control Mechanisms in Axial Piston Pumps

Pump control with a variable displacement type piston pump is mainly adopted for hydrostatic transmission of a relative large power. In this paper, the characteristics of servo type displacement control mechanisms used in a swash plate type and a bent-axis type piston pump are analyzed theoretically and experimentally. The calculated values by the non-linear theory coincide well with the test data. Effects of the parameters on the stability, the speed of response and so on are also discussed for general utility to design purposes.