Rotary pump

Continuously variable transmission comprising a driving belt/pulley arrangement whose pulley has two sheaves, at least one of which is axially displaceable relative to a pulley shaft by means of a hydraulic cylinder, a torque converter including a stator fixed on a fixed shaft, a turbine, and a turbine shaft connected to the pulley shaft, a rotary pump with a drive shaft, whereby a pump section of the torque converter is coupled to the drive shaft of the rotary pump, said drive shaft being disposed coaxially around the fixed shaft of the stator, said rotary pump having a rotor with displacement elements which are movable in grooves of the rotor, a cam ring surrounding the rotor, said displacement elements sliding along the radial inner side of the cam ring and thereby surrounding the pump chambers, end faces bounding the rotor at both sides, and one or more supply and discharge apertures, and end plate being provided between at least one of said end faces and a side face of the rotor, and at least one seal disposed between the end face and the end plate, for sealing the supply and/or discharge apertures in order to prevent leakages between the end plate and the end face.