Abstract: The hydraulic power source used for hydraulic system and equipment of off-shore operation platform or in deep sea environment is required to be small-sized, portable, environmental protected and with high power density. To meet that demand, the axial piston canned motor pump with double swash plate is designed. The body of the axial piston pump with double swash plate is integrated in the rotor of the canned motor. The pump is suitable for working in the hostile underwater environment and it has a series of advantages like small-sized, portable, with compact structure, high power density and strong antipollution ability. The kinetic equilibrium is studied and the performance experiments of the prototype are carried. The results show that compared to the traditional pump which has three power units, motor, shaft coupling and piston pump, this one has sound heat dissipation performance and decreased working noise. Meanwhile, the performance curve satisfies the expecting requirements well so that the possibility of this kind pump is verified. Altogether, this kind of pump is a promising one and can provide a new idea for the designing of new hydraulic power unit.

Key words: Axial piston pump, Double swash plate, Hydraulic power source, Motor pump