Vacuum pump

A vacuum pump, comprising:

• a housing which limits a working space, and a rotor, which is rotatably mounted in the housing about a rotor axis, wherein the rotor guides at least one vane being movably mounted in a radial direction, wherein the vane has a transverse extent, and wherein the vane divides the working space into a suction side having a suction inlet and a pressure side having a pressure outlet, the housing further comprising at least one oil outlet different from the pressure outlet, wherein the oil outlet is closed by a relief valve, wherein the relief valve assumes an open position when a limit pressure lying above a nominal pressure is exceeded in the working space, and wherein the transverse extent of the vane is large enough that when the vane passes the oil outlet, the oil outlet is closed by the vane, so that there is no fluid connection between the suction side and the pressure side over the oil outlet.