Electric motor for driving hydraulic pump i.e. vane pump, has rotor arranged outside hollow shaft, and groove provided in shaft and/or in rotor for realizing cooling circuit, where groove extends in direction of axis of rotation of shaft

摘要

The motor (1) has a stator (3) and a rotor (7) arranged radially outside a hollow shaft (5). A cooling circuit is fed with hydraulic oil of a hydraulic pump, where a groove (21) is provided in the shaft and/or in the rotor for realizing the cooling circuit. The groove extends in a direction of an axis of rotation (D) of the shaft. The shaft comprises a radially running transverse borehole and a longitudinal borehole. A centrifugal pump element (25) cooperates with the shaft and/or the rotor, where the centrifugal pump element is made of plastic.