Electric powered machine e.g. electric motor/generator, for motor vehicle, has antifriction bearings attached in casing, which is movable in axial direction of shaft and is prestressed by spring unit in axial direction against stopper

摘要

The machine has a rotor fastened to a shaft (10), and a stator surrounding the rotor, where the shaft is supported in a housing (12) by antifriction bearings (14, 16). The bearings are attached in a casing (18) that is movable in an axial direction of the shaft in the housing and is prestressed by a spring unit (20) in the axial direction against a stopper (22) at the shaft. The casing is made of a material, which has a smaller thermal expansion coefficient than the material of the housing.