Abstract
The temperature distributions of the cam-ring and the side-plates of a hydraulic vane pump were examined under real operating conditions. Seven thermocouples were embedded in the side-plate and seven were implanted in the cam-ring. Mineral oil type hydraulic oil with ISO VG32 was used as the test fluid. The maximum discharge pressure was up to 20 MPa and the rotational speed was between 15 and 25 rps. The inlet oil temperature was specified at 30 to 50℃. At pressures ranging from the atmospheric pressure to the maximum discharge pressure, the torque and the flow rate were measured and the changes in the temperatures were monitored. The salient conclusions are as follows: The temperature of the cam-ring was maximized at the suction port. The cam-ring's temperature was markedly increased as the discharge pressure increased. The rise in the temperature was decreased as the inlet oil temperature was lower. The circumferential temperature distributions of the side-plate were nearly uniform. Compared with the cam-ring's temperature, the effect of the rotational speed on the side-plate's temperature was greater, but the effect of the discharge pressure was smaller.
