Patent ID: 9450472
Filing Date: 2016-09-20
CPC Classification: H02K

Claim Text:
1. A power tool comprising: a housing; a transmission assembly; a brushless DC motor housed inside the housing, the motor comprising a stator assembly, and a rotor assembly at least a portion of which is arranged pivotably inside the stator assembly, the rotor assembly including a rotor lamination stack housing a plurality of permanent magnets, a rotor shaft fixedly housed inside a center portion of the lamination stack to pivot therewith, and a fan fixedly attached to the rotor shaft, the fan having a back plate and a plurality of blades longitudinally projecting from a periphery of the back plate towards the stator assembly; and a ring gear mount affixed to an end of the stator assembly between the motor and the transmission assembly, the ring gear mount integrally forming a motor end cap facing the motor such that the fan is arranged between the stator assembly and the motor end cap and an outer portion of the fan plate that supports the fan blades nests inside the ring gear mount between the stator assembly and the end cap, the ring gear mount further supporting at least one component of the transmission assembly on a side thereof opposite the motor end cap.