An electromechanical actuator comprises a casing, an electric motor, a gearbox, a spring-applied brake (25), and a centring shaft (71). The brake (25) comprises a coil spring (48), a drum (49), an input member (50) and an output member (51). The output member (51) comprises a first bore (73). The shaft (71) is mounted inside the first bore (73) of the output member (51) and a bore of a sun gear (40) of a reduction stage (38) of the gearbox. The drum (49) comprises a shoulder (90). Furthermore, a planet carrier (66) of the reduction stage (38) is configured to bear against the shoulder (90) of the drum (49).

A window covering includes a movable window covering material, lift cords for moving the material, a lift cord take-up shaft for gathering and releasing lengths of the lift cords to move the window covering material, and a motorized lift assembly. The motorized lift assembly includes a motor assembly including a motor, a gear train drivingly connected to and operated by the motor, and a driveshaft drivingly connected to the gear train and to the lift cord take-up shaft. The gear train includes a plurality of planetary gear stages.

A motorized window treatment system may include a roller tube, a covering material windingly attached to the roller tube, and a drive assembly that may be at least partially disposed within the roller tube. The drive assembly may include a motor having a drive shaft that is elongate along a longitudinal direction and a drive gear attached to the drive shaft such that a toothed portion of the drive gear is cantilevered with respect to the drive shaft. The drive assembly may include a gear assembly having a pair of intermediate gears on opposed sides of the drive gear. Rotation of the drive gear may be transferred through the pair of intermediate gears, a connecting gear, a planetary gear set, a cage, and an idler to the roller tube. Rotation of the roller tube may cause the covering material to move between an open position and a closed position.

An electromechanical actuator comprises a casing, an electric motor, a gearbox, a spring-applied brake (25) and a centring shaft (71). The brake (25) comprises a coil spring (48), a drum (49), an input member (50), an output member (51) and a bushing (76). The input member (50) comprises a first bore (72). The output member (51) comprises a first bore (73) and a second bore (74). The shaft (71) is mounted inside the first bore (73) of the output member (51) and a bore of a sun gear of a reduction stage of the gearbox. The bushing (76) comprises a bore (77), inside which the shaft (71) is mounted. The bushing (76) is mounted inside the first bore (72) of the input member (50) with an interference fit and inside the second bore (74) of the output member (51) with a loose fit.

An electromechanical actuator comprises a casing, an electric motor, a gearbox, a spring-applied brake (25), and a centring shaft (71). The brake (25) comprises a coil spring (48), a drum (49), an input member (50) and an output member (51). The output member (51) comprises a first bore (73). The shaft (71) is mounted inside the first bore (73) of the output member (51) and a bore of a sun gear (40) of a reduction stage (38) of the gearbox. The drum (49) comprises a shoulder (90). Furthermore, a planet carrier (66) of the reduction stage (38) is configured to bear against the shoulder (90) of the drum (49).

A motorized window treatment system may include a roller tube, a covering material windingly attached to the roller tube, and a drive assembly that may be at least partially disposed within the roller tube. The drive assembly may include a motor having a drive shaft that is elongate along a longitudinal direction and a drive gear attached to the drive shaft such that a toothed portion of the drive gear is cantilevered with respect to the drive shaft. The drive assembly may include a gear assembly having a pair of intermediate gears on opposed sides of the drive gear. Rotation of the drive gear may be transferred through the pair of intermediate gears, a connecting gear, a planetary gear set, a cage, and an idler to the roller tube. Rotation of the roller tube may cause the covering material to move between an open position and a closed position.

A compact type dual-motor driving and force balance control device for roller blinds is provided. A left aluminum alloy support is fixedly disposed at one end of the roller blind spool, a left driving motor is fixedly disposed on one side of the left aluminum alloy support, a left driving output planetary reducer is fittingly disposed at an output end of the left driving motor, a left planetary reducer torque output shaft is fixedly disposed at one end of the left driving output planetary reducer, and a left connecting plate is fixedly disposed at one end of the left planetary reducer torque output shaft.