Actuator for automotive power seat sharing BLDC motor

An actuator for an automotive power seat, comprising:

• a motor assembly including:
• a BLDC motor comprising a rotor, a stator assembly, and a motor shaft rotatably supporting the rotor;
• a PCB module having a through-hole through which the motor shaft passes, the PCB module including a sensing sensor configured to detect a position of the rotor and a PCB disposed in a direction perpendicular to the motor shaft;
• a second shaft bearing rotatably supporting the motor shaft;
• a stator housing having a hollow portion accommodating the stator assembly;
• a PCB cover including a short cylindrical portion communicating with the hollow portion of the stator housing, a side-wall portion surrounding a side surface of the PCB, and a cylindrical well portion configured to receive a capacitor;
• a first shaft bearing rotatably supporting the motor shaft at a side opposite to the second shaft bearing;
• a bearing cover coupled to the first shaft bearing and fitted to the stator housing;
• and
• a reduction-gear assembly coupled to the motor assembly at a side where the motor shaft extends, the reduction-gear assembly receiving a rotational force of the motor to perform speed reduction, wherein the reduction-gear assembly comprises:
• a reduction-gear housing accommodating a gear set including reduction gears and receiving an extended portion of the motor shaft;
• the gear set further including at least a gear worm coupled to one end of the motor shaft and a worm wheel engaged with the gear worm;
• and
• a bearing guide surrounding an outer circumferential surface of the second shaft bearing and positioned inside the reduction-gear housing, wherein the reduction-gear housing comprises:
• a PCB-cover portion covering the PCB of the PCB module exposed from the motor assembly and coupled to the motor assembly;
• a gear-mounting portion in which the gear set is accommodated;
• and
• a shaft-receiving portion connecting the PCB-cover portion and the gear-mounting portion and receiving one end of the motor shaft on which the gear worm of the gear set is coupled,
• wherein the reduction-gear housing is integrally formed.