Abstract: A planetary gear type reduction gear with torque limiter including an input shaft (7) of an output shaft of a DC motor and an output shaft (14) are journalized on a stationary member (11). At least one stage of the planetary gear type reduction mechanism includes a central gear (8), a planetary gear (34) meshed with the central gear (8), an inner gear (22) meshed with the planetary gear (34), and a carrier (30) journalizing the planetary gear (34). The inner gear (22) is disposed with a clearance to the stationary member 11 in a radial direction, and the inner gear (22) is opposed and disposed to the stationary member (11) in the axial direction by means of friction members (26, 28), which are urged against the inner gear (22). The inner gear 22 is retained at the side of the stationary member (11) in a slip rotation condition by the friction force between the friction members (26, 28) and the inner gear (22).

Abstract: An object of the present invention is to provide a planetary gear type reduction gear with torque limiter that demonstrates always stably torque limiter function, and the invention is characterized in that an input shaft and an output shaft 7 consisting of an output shaft of a DC motor and an output shaft 14 are journalized on a stationary member 11, and at least one stage of the planetary gear type reduction mechanism comprising a central gear 8, a planetary gear 34 meshed with the central gear 8, an inner gear 22 meshed with the planetary gear 34, and a carrier 30 journalizing the planetary gear 34 and a torque limiter are provided between the input shaft and the output shaft.