GEAR WHEEL PUMP Russian patent published in 2012 - IPC F04C2/08 

FIELD: mechanical engineering.

SUBSTANCE: gear wheel pump comprises two gear wheels each of which has ground internal and external surfaces and end planes, and ground-face plates. The gear wheels and plates are made of austenite steel. The end planes of each gear wheel and the plate faces are facing the gear wheels, polished and plastically deformed by a ultradispersed detonation diamond suspension of the grain size of 100 nm and less with using a lapping disk of one-lap lapping and polishing machine with verticity of the patterns 8 wherein the gear wheels or plates are inserted that is combined with rotation of the lapping disk 9, with the deformed layer thickness of 12 to 20 nm and the deformed layer hardness being 3-3.5 times higher than the hardness of the other material.

EFFECT: higher reliability and life of the gear wheel pump.