LAUSR

In a gerotor pump, pressure pulsation occurs in a chamber through contact with the internal and external rotors. This causes an overhung load on the pump shaft bearing and cavitation, which affect the durability and noise of the pump. In this study, relief grooves on the port plate were designed to reduce pressure pulsation and verified experimentally. The opening areas between the port plate and chamber with and without relief grooves were obtained. The relation between the pressure pulsation and relief grooves was examined through a simulation and verified experimentally. The results indicated that the relief grooves were very effective at reducing and stabilizing the pressure pulsation of the pump outlet and in the chamber. Thus, installing relief grooves on the port plate can improve the durability of the pump and allow the size of the motor coupled with the pump to be reduced.