Patent ID: 6824486
Filing Date: 2004-11-30
Classification: F04C,F16H,F16N

Abstract:
A gear pump comprising:a casing formed with an intake port, a gear chamber and a delivery port; and at least two gears rotatably mounted in the gear chamber and in mesh with each other, whereby rotation of said gears sucks oil in through the intake port and discharges oil from the delivery port and causes radially extending side faces of the two gears to slide on internal side faces of the gear chamber of the casing; and wherein one of said gears has a peripheral surface formed of teeth with grooves separating adjacent teeth, opposing and radially extending side faces and, in at least one of said opposing and radially extending side faces, first means for forming an oil film arranged radially inward of bottoms of said grooves and radially aligned with said bottoms of said grooves and second means for forming an oil film arranged radially outward of the bottoms of said grooves.