Washing machine

Abstract

A washing machine is provided. The washing machine includes: a washing drum which is rotatable and intersects with an up-down direction; a rotating part having a plurality of concave parts arranged in a rotating direction of the washing drum, and the rotating part is connected with the washing drum so that the rotating part rotates integrally with the washing drum; and a locking part for locking rotation of the rotating part by fitting in the concave parts. In the washing machine, a nut member is in threaded connection with the threaded shaft and connected to the rotating part so that the nut member moves along the threaded shaft along with rotation of the threaded shaft, thereby causing the rotating part to rotate. A backlash between the locking part fitted in the concave parts and the rotating part is smaller than a backlash between the threaded shaft and the nut member.

What is claimed is: 
     
         1 . A washing machine, comprising:
 a washing drum for accommodating washings, wherein the washing drum is rotatable and intersects with a vertical direction;   a rotating part having a plurality of concave parts arranged in a rotating direction of the washing drum, wherein the rotating part is connected with the washing drum so that the rotating part rotates integrally with the washing drum;   a locking part for locking rotation of the rotating part by fitting in the concave parts or unlocking the rotating part by retracting from the concave parts;   a threaded shaft;   a motor for driving the threaded shaft to rotate; and   a nut member, wherein the nut member is in threaded connection with the threaded shaft and connected to the rotating part, so that the nut member moves along the threaded shaft as the threaded shaft rotates, thereby causing the rotating part to rotate,   wherein a backlash between the locking part fitted in the concave parts and the rotating part is smaller than a backlash between the threaded shaft and the nut member.   
     
     
         2 . A washing machine, comprising:
 a washing drum for accommodating washings, wherein the washing drum is rotatable and intersects with a vertical direction;   a rotating part, wherein the rotating part is connected with the washing drum so that the rotating part rotates integrally with the washing drum;   a threaded shaft;   a motor for driving the threaded shaft to rotate;   a nut member, wherein the nut member is in threaded connection with the threaded shaft and connected to the rotating part, so that the nut member moves along the threaded shaft as the threaded shaft rotates, thereby causing the rotating part to rotate; and   a pair of supporting parts, wherein the supporting parts support both side parts of the threaded shaft in an axial direction so that the threaded shaft is rotatable.   
     
     
         3 . The washing machine according to  claim 1 , further comprising: a coupling for connecting an output shaft of the motor and the threaded shaft. 
     
     
         4 . The washing machine according to  claim 1 , wherein the threaded shaft and the nut member are formed with trapezoidal threads. 
     
     
         5 . The washing machine according to  claim 2 , further comprising: a coupling for connecting an output shaft of the motor and the threaded shaft. 
     
     
         6 . The washing machine according to  claim 2 , wherein the threaded shaft and the nut member are formed with trapezoidal threads. 
     
     
         7 . The washing machine according to  claim 3 , wherein the threaded shaft and the nut member are formed with trapezoidal threads.