| 摘要 |
Disclosed is a speed reducer for driving a window curtain or a door curtain, comprising at least one involute planetary gear reducing mechanism (2), a cycloid gear reducing mechanism (1) in transmission connection to the involute planetary gear reducing mechanism (2), an output shaft (3) connected to the cycloid gear reducing mechanism (1), and a housing assembly (5), wherein the involute planetary gear reducing mechanism (2) comprises a sun gear (21) and at least one planetary gear (22), and the middle of the planetary gear (22) is provided with a mandrel (23) passing therethrough; the cycloid gear reducing mechanism (1) comprises a camshaft (11), the output shaft (3) sheathed at the upper end of the camshaft (11), at least one cycloid gear (13) sheathed on a cam of the camshaft (11), a plurality of pinwheels (14) meshed with a side face of the cycloid gear (13), and at least one pin shaft (15) in parallel to the axial direction for the cycloid gear (13) to pass through, and the upper end of the pin shaft (15) is fixedly connected to the output shaft (3); and the lower end of the camshaft (11) is fixedly connected to a first planet carrier (12), the mandrel (23) penetrates the first planet carrier (12) and is fixedly connected to the first planet carrier (12), the lower end of the sun gear (21) is sheathed with a first bearing (41), and the lower part of the camshaft (11) is further sheathed with a second bearing (42). The size of the speed reducer is small, the transmission efficiency is high, the noise is low, and the self-locking performance is good. |
