Abstract:Aiming at the significant temperature difference on triple piston pump housing in the hydraulic system of roadheader, the heat generating mechanism of the axial piston pump was firstly analyzed. The temperature rise of housing, drain pressure and the drain flow volume of the axial piston pumps with different displacements in the triple pump were measured by experiments.The results show that the axial piston pumps with displacements of 145 and 260 mL/r have the highest temperature in the middle part of the housing, which is caused by the total power loss of the slipper pair, the plunger pair, the distributor pair and the stir of the plunger pump; the axial piston pump with the centrifugal filling pump can significantly reduce the housing temperature by sending the pumping excess oil back to the oil tank through the housing, and the temperature drop can reach 11 ℃.