Patent ID: 9325226
Filing Date: 2016-04-26
CPC Classification: H02K

Claim Text:
1. An electric motor for a drive device for moving a vehicle part relative to another vehicle part, the electric motor comprising: a stator comprising a stator housing; a drive shaft being rotatable with respect to the stator about an axis of rotation; a rotor mounted on the drive shaft and comprising at least one rotor winding; a commutator mounted on the drive shaft for supplying an electric current to the at least one rotor winding of the rotor during operation of the electric motor; at least two brushes mounted on the stator housing, the brushes being in sliding contact with the commutator for supplying the electric current to the at least one rotor winding during operation of the electric motor; a bushing mounted on the drive shaft adjacent to the commutator, wherein the bushing comprises a first bore through which the drive shaft extends such that the bushing is in direct contact with the drive shaft and wherein the bushing is press-fitted onto the drive shaft; and a cone element mounted on the drive shaft adjacent to the bushing on a side of the bushing facing away from the commutator, the cone element having an outer surface which at least in part conforms to the shape of a cone being concentrical to the drive shaft and having a tip pointing away from the bushing, wherein the cone element comprises a second bore through which the drive shaft extends, the second bore axially adjoining the first bore along the axis of rotation such that the cone element is in direct contact with the drive shaft, wherein the cone element, with a first side, faces the bushing; wherein the cone element comprises two symmetrical cone segments projecting from an element body, the cone segments being located diametrically opposite to each other with respect to the drive shaft and, when viewed along a circumferential direction around the axis of rotation, being separated from each other by recesses formed by indentations in the outer surface of the cone element, the recesses extending axially in parallel to the drive shaft in between the cone segments and ending at the first side of the cone element facing the bushing.