Window covering and driving device thereof

#The present disclosure generally relates to a window covering and a driving device thereof, and more particularly to a window covering having a covering material which can be driven to expand or collapse by a motor and a driving device thereof.

#Window coverings are materials used to cover a window opening of a building to ensure privacy, insulate heat, block light, or provide other functions. A window covering known to the inventors includes a headrail, a covering material, a shaft located in the headrail, a decelerating device, and a motor, wherein the covering material is located below the headrail and is connected to the shaft, and a rotating shaft of the motor is connected to the shaft through the decelerating device. By controlling the motor to rotate its rotating shaft, the shaft can be driven to rotate by the force transferred through the decelerating device, whereby the shaft can move the covering material to make it collapse or expand.

#The decelerating device of a window covering is usually an epicyclic gearing decelerating device, which includes a sun gear, a plurality of planet gears, and a ring gear. The sun gear is connected to the rotating shaft of the motor, and can be driven to rotate by the rotating shaft of the motor. The periphery of the sun gear meshes with the planet gears, and the ring gear is fixedly provided around the outer periphery of the planet gears, meshing with the planet gears. When the sun gear is moved to drive the planet gears to rotate, each planet gear rotates and revolves along the ring gear. While the planet gears are rotating and revolving, the teeth of the planet gears continuously mesh with the teeth of the ring gear and the sun gear along with the rotational movements. The surfaces of the teeth which are in a meshing state rub against each other, and the friction from such rubbing makes a pretty noticeable noise, which can be transmitted through the headrail and heard from outside. This kind of noise is particularly obvious when the planet gears are driven by high-speed rotations. Since window coverings are usually installed indoors, such noise generated during the lowering or raising of the covering material can be quite bothersome for the people in the nearby environment.

#The present disclosure will be best understood by referring to the following detailed description of some illustrative embodiments in conjunction with the accompanying drawings, in which:

#FIG. 1 is a perspective view of the window covering of a first embodiment;

#FIG. 2 is a top view showing the interior of the housing of the first embodiment;

#A window covering 100 of a first embodiment of the present disclosure is shown in FIG. 1 to FIG. 11, which includes a housing 10, a covering material 12, a spindle 14, and a driving device 16, wherein:

#The housing 10 is a frame having a receiving space 10a therein. The covering material 12 is located below the housing 10, and the covering material 12 has a lower end 122 movable relative to the housing.

#The spindle 14 and the driving device 16 are provided in the receiving space 10a of the housing 10. In some embodiments, the spindle 14 has a polygonal or round cross-sectional outline. The spindle 14 extends in a longitudinal direction of the housing 10, wherein the driving device 16 is connected to an end of the spindle 14, and can be used to drive the spindle 14 to rotate.