GEAR PUMP Russian patent published in 2000 - IPC

FIELD: mechanical engineering; oil systems of gas turbine engines. SUBSTANCE: gear pump has housing with suction and discharge spaces. Cylindrical bores of housing accommodate external tooth gears and floating end face bushings mated over contact surfaces located square to center line. Unloading grooves are made on surface of bushings. Grooves located from discharge space side are mated with side surfaces of gears. Hole is made on end face surface of unloading grooves. Channels made on end face surface of housing cylindrical bores under end face bushings communicate with pump discharge space and with hole in end face bushings unloading grooves. EFFECT: reduced compression in gear tooth spaces at engagement of gears. 3 dwg