Electric suspension oil pump having fluid leakage prevention structure

Abstract

The present invention relates to an electric suspension oil pump having a fluid leakage prevention structure, wherein a high-pressure fluid introduced from the pump unit of a bidirectional rotary pump type to the motor unit thereof can be efficiently recovered. To implement this, the present invention comprises: a pump unit including a rotor having a plurality of vanes coupled thereto to be radially slidable with respect to a rotary shaft installed in a cam ring of an inner accommodation space, thereby rotating integrally, and first and second ports for variably suctioning and discharging a fluid according to the rotational direction of the rotor; a motor unit installed with a partition wall interposed therebetween in the axial direction of the pump unit to rotate the rotating shaft forward / backward; opening / closing unit having first and second passages formed to connect the inner accommodation spaces of the pump part unit the motor unit to each other, and having solenoid valves for opening / closing the first and second passages, respectively; and a control unit for controlling the opening / closing unit in accordance with a difference in pressure of the fluid when the first and second ports vary suction and discharge in accordance with forward / backward rotations of the pump unit, thereby opening / closing the first and second passages alternately. The fluid leaked into the internal accommodation space of the motor unit through a gap of the partition wall to which the rotary shaft is coupled can be recovered into the internal accommodation space of the pump unit via any one of the first and second passages.

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