Patent ID: 7544052
Filing Date: 2009-06-09
Classification: F04C

Abstract:
1. An oil pump for an internal combustion engine for drawing un lubricating oil from an oil collector device, comnrising: an oil pump housing formed with a suction passage and a delivery passage: at least two pairs of gears disposed in said oil pump housing, said pairs of gears defining respective pumping stages with a suction side connected to said suction passage and a delivery side connected to said delivery passage: said oil pump housing being formed with an oil supply passage communicating with said suction passage of a first pumping stage and enabled to deliver lubricating oil to the suction side of the first pumping stage, the lubricating oil supplied to the suction side of said first pumping stage via said oil supply passage is delivered via a second pumping stage of said pumping stages; and the second pumping stage comprises an adjusting device for setting a variable delivery volume, and said adjusting device includes an electrically activated valve for controlling a lubricating oil supply of the suction side of said first pumping stage.