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Motor pump unit

  • US 9,046,087 B2
  • Filed: 08/04/2011
  • Issued: 06/02/2015
  • Est. Priority Date: 02/13/2009
  • Status: Expired due to Fees
First Claim
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1. Motor pump unit for a high-pressure cleaning apparatus, comprising:

  • a liquid-cooled electric motor and a pump, wherein;

    the electric motor has a cup-shaped motor housing that is surrounded by a cooling housing with an annular space having an annular space inlet and an annular space outlet formed therebetween,the pump has a suction inlet connected to the annular space outlet for drawing in liquid and a pressure outlet for discharging the liquid,the liquid to be transported by the pump is suppliable to the annular space inlet,the motor housing is monolithically formed as a one-piece deep-drawn part comprising a cylindrical shell and a bottom, the cylindrical shell comprising a front shell area which contacts stator laminations of the electric motor and a rear shell area which is arranged at a distance from rear coil heads of the stator, the rear shell area having stiffness-enhancing depressions,the front and the rear shell areas are surrounded by the annular space,the motor housing has a collar arranged on a side of the depressions that faces away from the pump, said collar being aligned concentrically with a motor shaft and forming a sealing face for a sealing ring.

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