GEAR-TYPE HYDRAULIC MACHINE (VERSIONS) Russian patent published in 2009 - IPC F04C2/08 

FIELD: mechanical engineering.

SUBSTANCE: invention refers to the field of gear-type hydraulic machinery construction and may be used in designs of pumps, hydromotors and flow dividers. The gear-type hydraulic machine contains at least body with high- and low-pressure orifices and inner bores where drive and driven gears are installed, and compensators with working surface contacting with buts of gear rims and nonworking surface with at least one collar installed on it. Shank bore of the collar is hydraulically connected with high-pressure orifice. Half of compensator working surface faced to low-pressure orifice is provided with a row of openings to collar bore and/or at least one open slot and/or chamfer which have passage to high-pressure orifice and/or communicating with high-pressure orifice hydraulically via at least one opening to shank bore of collar. Edge of the nearest of openings row and/or beginning of open slot or chamfer is spaced from edge of low-pressure orifice for at least one gear pitch.

EFFECT: forces acting on pair of gears from high-pressure fluid are reduced and consequently frictional forces in slider bearings of gear knuckles are reduced.

2 cl, 6 dwg