Electro-hydraulic power unit with a rotary cam hydraulic power unit
AssigneeSauer-Danfoss Inc.
InventorsMichael D. Gandrud, Torben Frederiksen, Hans Esders
Life of this patent
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Abstract
An electro-hydraulic power unit is disclosed that includes a housing filled with hydraulic fluid. A hydraulic power unit is disposed within the housing, the power unit having a mechanical power shaft. Additionally, an electric machine is disposed within the housing adjacent to the hydraulic power unit, the electric machine having a rotor secured to the mechanical power shaft of the hydraulic power unit. Hydraulic fluid within the housing passes over the electric machine, thus cooling the electric machine and providing for improved efficiency and performance.
Claims24
An electro-hydraulic power unit comprising:
- a housing;
- a hydraulic power unit within the housing, said power unit having a mechanical power shaft;
- and
- an electric machine within the housing adjacent to the hydraulic power unit, said electric machine having a rotor secured to the mechanical power shaft of the hydraulic power unit and a stator press-fit into the housing, wherein there is a rotor-stator gap between the rotor and the stator and a bypass channel between the stator and the housing, wherein the temperature of suction flow through the rotor-stator gap is controlled by directing suction flow through the bypass channel when the power unit is operating below a selected temperature and directing suction flow through the rotor-stator gap when the power unit is operating above the selected temperature.
An electro-hydraulic power unit comprising:
- a housing;
- a hydraulic power unit within the housing, said power unit having a mechanical power shaft and said hydraulic unit having a portion received within a bearing housing having tapered side walls;
- an electric machine within the housing adjacent to the hydraulic power unit, said electric machine having a rotor secured to the mechanical power shaft of the hydraulic power unit and a stator press-fit into the housing, wherein there is a rotor-stator gap between the rotor and the stator and a bypass channel between the stator and the housing, wherein the temperature of suction flow through the rotor-stator gap is controlled by directing suction flow through the bypass channel when the power unit is operating below a selected temperature and directing suction flow through the rotor-stator gap when the power unit is operating above the selected temperature.
Dependencies are inferred from the claim text.