Patent ID: 8747085

Claim:
Vane cell pump having a rotor ( 3 ) mounted in a pump housing ( 1 ) and driven by a shaft ( 2 ), multiple vane plates ( 5 ) mounted in bearing grooves ( 4 ) of the rotor ( 3 ), and an outer ring ( 6 ) that surrounds the rotor ( 3 ) and the vane plates ( 5 ), having a suction kidney ( 8 ) disposed in the pump housing ( 1 ), and a pressure kidney ( 9 ) disposed in the pump housing ( 1 ) offset by 180° from the suction kidney, and transverse grooves ( 12 ) disposed at the lower edge of each cell chamber ( 10 ) in the cylinder mantle surface of the rotor ( 3 ) between the bearing grooves ( 4 ), running over the entire rotor width, disposed parallel to the bearing grooves ( 4 ) of the vane plates ( 5 ), spaced apart from the bearing grooves ( 4 ) by a bearing crosspiece ( 11 ), wherein the transverse grooves ( 12 ) have a non-symmetrical cross-section progression ( 13 ), which has a low point ( 14 ), having the smallest radius of the rotor ( 3 ), in each of the cell chambers ( 10 ), wherein the low point is always disposed behind the cell chamber center axis ( 15 ), seen in the direction of rotation.