Geared motor having worm and worm wheel

摘要

A rotor (6) of a motor (1) includes an engaging portion (24) that engages an annular portion (4c) of a yoke (4) based on movement of a rotatable shaft (9) in a thrust direction to brake the rotatable shaft (9). There is provided a Belleville spring (7) that limits the movement of the rotatable shaft (9) in the thrust direction to prevent engagement of the engaging portion (24) with the annular portion (4c) when a thrust load applied on the rotatable shaft (9) is equal to or smaller than a predetermined value. Furthermore, the Belleville spring (7) allows the movement of the rotatable shaft (9) in the thrust direction to allow the engagement of the engaging portion (24) with the annular portion (4c) when the thrust load applied on the rotatable shaft (9) is larger than the predetermined value. <IMAGE> <IMAGE>