Patent ID: 8920138

Claim:
A motor pump unit for a high-pressure cleaning apparatus, comprising: an electric motor and a pump, the electric motor comprising a motor housing that is surrounded by a cooling housing with an annular space having an annular space inlet and an annular space outlet, the annular space being formed between the motor housing and the cooling housing, the pump comprising a drive housing on which is supported a motor shaft of the electric motor, a suction inlet for drawing in liquid, and a pressure outlet for discharging pressurized liquid, the annular space outlet being fluidly connected to the suction inlet, liquid to be pressurized by the pump being suppliable to the annular space inlet, the drive housing having at least one cooling passage which is arranged upstream of the suction inlet and which is adapted to have the liquid to be pressurized flow therethrough; and the drive housing comprising a base body having a motor-side wall section which contacts the motor housing, and a pump-side wall section which contacts a housing of the pump, the at least one cooling passage being disposed laterally alongside the motor-side wall section, external to the motor-side wall section; wherein: the base body is connected in one piece to the at least one cooling passage via at least one heat-conductive rib projecting outward from the base body; and the at least one heat-conductive rib is located between the base body and the at least one cooling passage.