Gerotor hydraulic pump with fluid actuated vanes

A gerotor pump having an outer rotor defining an inner surface of the outer rotor, a thrust plate, a pressure plate, an inlet chamber for fluid intake through the thrust plate to be pressurized, and an outlet chamber for outputting pressurized fluid from the pressure plate, comprising:

• an inner rotor assembly in rotating engagement with the outer rotor between a first axial end surface defined by the thrust plate and a second axial end surface defined by the pressure plate, said inner rotor assembly rotating about an axis, said inner rotor assembly comprising:
• a rotor body, wherein the rotor body includes N, an integer greater than one, vane slots defining a first sealing surface, and said rotor body includes N inner openings around the axis, each of said inner openings adjoins a respective one of the vane slots, and
• a plurality of vanes defining a second sealing surface, wherein each of said vanes is disposed in one of the vane slots and in sealing engagement with the rotor body via the first and second sealing surfaces,
• wherein the inner rotor assembly is in sealing engagement with the outer rotor by each of the vanes engaging on the inner surface of the outer rotor;
• said gerotor pump further comprising:
• said thrust plate defining a first annular groove on the first axial end surface;
• and
• said pressure plate defining a second annular groove on the second axial end surface, said second annular groove further comprising a plurality of fluid communication holes in the second annular groove,
• wherein the radius of any of the first and second annular grooves is located at a distance between one of the inner openings and the axis, and
• wherein the first annular groove, the second annular groove, the fluid communication holes and the inner openings are in fluid communication.