Adjustable vane pump

An adjustable vane pump, comprising a suction side and a pressure side, with a housing and with a rotor, which is supported in the housing so as to be rotatable about a rotor axis and carries at least one vane supported movably in a radial direction, wherein the housing comprises a housing floor and a housing cover transversely to the rotor axis, and wherein an adjustment cage that is arranged between the housing floor and the housing cover, encloses the rotor and the vane and is adjustable transversely to the rotor axis is provided in the housing, characterized in that the housing and the adjustment cage delimit a pressure chamber connected fluidically to the pressure side, wherein a restoring element is provided, which pushes the adjustment cage into a base end position, and wherein the adjustment cage is deflected from the base end position if a limit operating variable is exceeded in the pressure chamber, further characterized in that the adjustment cage is deflected into a deflection end position on exceeding of the limit operating variable either abruptly or continuously as the limit operating variable increases, wherein the rotor drive operates at a speed and a torque, wherein at least one of the speed and the torque of the rotor drive are identical in the base end position and the deflection end position, wherein the vane pump includes a conveying volume, wherein the conveying volume in the base end position is 1.5 to 4 ccm/rev, and in that the conveying volume in the deflection end position is 0.2 to 1.4 ccm/rev, and in that the conveying volume in the base end position is 5 to 20 1/min, and in that the conveying volume in the deflection end position is 0.5 to 4 1/min.