Patent ID: 7070396
Filing Date: 2006-07-04
Classification: F01C,F04C

Abstract:
1. An oil pump apparatus comprising: a base portion including: an operating chamber; a shaft aperture; a suction port; a discharging port; a suction passage supplying an oil to the suction port; and a discharged passage discharging the oil from the discharging port; a rotating means disposed in the operating chamber for its rotation and acting as a pump introducing the oil in the suction passage to the operating chamber via the suction port and supplying the oil to the discharged passage via the discharging port; a drive shaft disposed in the shaft aperture for its rotation so as to rotate the rotating means; a sealing means disposed in a boundary between an outer peripheral surface of the drive shaft and an inner peripheral surface of the shaft aperture so as to seal the boundary; and a drain bore including: a drain inlet communicating with the shaft aperture; a drain outlet communicating with the suction passage; and a drain connecting passage connecting the drain inlet and the drain outlet, wherein an excess oil in the shaft aperture is introduced from the drain inlet for draining the oil and is drained from the drain outlet via the drain connecting passage, wherein an opening center of the drain outlet is positioned outwardly from an inner peripheral surface of the suction passage, or from an extended line of the inner peripheral surface of the suction passage, as seen in an orthogonal direction relative to a central axis of the suction passage.