| 摘要 |
A cleaning device includes a housing which bounds an internal space, and an electric motor and bearings for the shaft of the rotor of the electric motor are accommodated in such space. A blower element shares in the rotation of the shaft and advances air from the exterior of the housing through the space and back to the exterior. A partitioning wall subdivides the space into separate compartments one of which accommodates the electric motor, the other compartment accommodating one of the bearings. The blower element advances the air through both of such compartments to cool the electromotor, on the one hand, and the bearing, on the other hand, independently of one another. The partitioning wall may be provided with an opening which admits a branched-off portion of the air from one compartment toward a commutator accommodated in the other compartment downstream of the electric motor. The bearings are supported in bearing blocks formed as parts of the housing, the bearing blocks having semi-annular bearing recesses and tangentially extending straight extensions thereof. A resiliently yieldable clamp extends between the extensions and urges the respective bearing into the bearing recess. Sheet-metal portions of holding devices for commutator brushes shield the housing from sparks which are generated by the contact of the commutator brushes with the commutator. |
