Patent ID: 6355996
Filing Date: 2002-03-12
Classification: B60K,B60L,B60Y,B62K,B62M,Y02T,Y10T

Abstract:
A motorized hub assembly comprisinga motor section having first and second end walls and a side wall extending between the end walls, stator windings fixed to and in intimate thermal contact with said side and end walls, a rotor rotatably mounted within the stator windings, a first shaft extending from the first end wall and a second shaft connected to said rotor and having an end extending through the second end wall, said second shaft being coaxial to but spaced axially from the first shaft, and a gear reduction section adjacent to the second end wall, said gear reduction section including a pinion at the end of the second shaft, a plurality of nonorbiting planet gears rotatably mounted to the second end wall in meshing engagement with the pinion, a third shaft coaxial to, but spaced axially from, the first and second shafts, a hub having an interior surface closely surrounding the motor section side and first end walls and said planet gears and being rotatably coupled to the first shaft and second end wall, and a ring gear formed at the interior surface of the hub in meshing engagement with the planet gears so that when said windings are energized, the heat produced thereby is conducted by said side and first end walls to said hub and thence to the outside while the hub rotates relative to the first shaft at a speed less than that of the second shaft.