3047 回転シリンダブロック式および回転斜板式アキシアルピストンポンプの熱潤滑特性(S81-2 トライボロジーの基礎と応用(2),S81 トライボロジーの基礎と応用)

概要

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Temperature of tribological parts of axial piston pumps with a mechanism of a rotating cylinder-block or a rotating swash-plate was measured. For the rotating cylinder-block type pump, five thermo-couples were embedded in the swash-plate and one thermistor was placed in the suction conduit. For the rotating swash-plate type pump, five thermo-couples were installed in the cylinder-block and one was at the casing. Hydraulic mineral oils with ISO VG68, VG46, VG32 and VG22 and a water-glycol type oil with VG32 were used as the test oil. The maximum discharge pressure was 20MPa, and the inlet oil temperature was specified at 20-40℃. At the atmospheric to maximum discharge pressures, the temperatures, flow rates and the torque were measured. In conclusion, i) The temperature of the swash-plate between the discharge and suction ports increased markedly; ii) The temperature of the cylinder-block at the bottom dead center of the pistons rose greatly; iii) The temperature rise was increased as the oil viscosity was higher, and iv) The temperature rise in the case of the water-glycol type oil was smaller than the rises of the mineral oils.
2007-09-07