Patent ID: 8324775
Filing Date: 2012-12-04
Classification: H02K

Abstract:
1. A brush DC motor with reduction mechanism, comprising: a brush DC motor including a hollow motor case, a stator section and a rotor section, the stator section and the rotor section being received in the motor case; and a first reducing section drivable by the motor, the first reducing section including a first sun gear, an external ring gear positioned around the sun gear and several planetary gears held between the external ring gear and the sun gear and engaged with the sun gear and the external ring gear, the first reducing section further including a planetary carrier for rotatably locating the planetary gears in respective true positions thereof, wherein the rotor section has a substantially cylindrical core, multiple linear splines being formed on a circumference of the core at intervals in parallel to each other, the splines extending along an axis of the core by a predetermined length, one end of the core with the splines formed on the circumference of the end serving as the sun gear of the first reducing section; wherein the core has a sleeve section and multiple pole shoes in the form of arcuate pieces, the pole shoes being arranged around a circumference of the sleeve section at intervals, a curvature center of the pole shoes coinciding with an axis of the sleeve section, multiple spoke sections being interconnected between the sleeve section and concave faces of the pole shoes, several slots being defined between the adjacent spoke sections.