GEAR PUMP Russian patent published in 2013 - IPC F04C2/08 

FIELD: engines and pumps.

SUBSTANCE: proposed pump comprises housing, drive and driven gears with journals running in sleeve bearings, and hydraulic compensator with pres chambers arranged on sleeve bearing rear sides and communicated with high-pressure zone via working fluid feed channels made in said sleeve bearings. Elastic press chambers feature closed design with variable cross-section to allow expanding to vary their cross-section at pressure change in high-pressure zone to prevent misalignment and to ensure invariable end clearance on gear both sides.

EFFECT: invariable end clearance on gear both sides, self-tightening.

4 dwg