A novel approach to predict the steady state temperature in ports and case of swash plate type axial piston machines

This paper presents a model able of predicting the working temperature of the hydraulic fluid in the case volume and outlet port of axial piston machines. For the first time the working temperature is estimated accounting for the power losses associated with the fluid flow in the lubricating interfaces, the churning motion of the oil in the machine case and the losses due to the compressibility of the hydraulic fluid. The paper illustrates a thorough comparison between the calculated and the measured case and outlet port temperatures for steady state operation of the axial piston machine.