A Study on the Thermal Shock in Low Speed High Torque Oil Hydraulic Motors

Abstract

In this paper, the authors have investigated the phenomena of thermal shock in cam curve type radial piston motors which are set in the environment of low temperature, and they show the methods to analyse the variation of clearance with thermal expansion as the temperature changes in both steady and unsteady states. The experimental results are obtained that the annular clearance comes in the hydraulic motor suddenly heated by oil of high temperature. It is made clear that the thermal shock is due to the difference of material thermal expansions between inner and outer parts of the cylinder. Thus some conclusions about prevention of thermal shock are reached.