US Patent 9219392 Brushless motor

A brushless motor is provided including: a rotor housing including a circular-cylinder-shaped bearing housing portion and an outer cylinder portion; a rotor magnet provided at an inner peripheral face of the outer cylinder portion; a bearing housed in the bearing housing portion and assembled to a motor shaft; a stator core including a ring-shaped core main body provided in the radial direction between the bearing housing portion and the rotor magnet and a ring-shaped wall portion formed in a ring-shape along an inner peripheral portion of the core main body, extending from the core main body inner peripheral portion towards the radial direction inside, and facing one opening of the bearing housing portion; and a center piece including a main body portion facing one opening of the outer cylinder portion, and a close contact portion closely contacting in the stator core axial direction with the ring-shaped wall portion.