Worm backlash adjustment device

A worm backlash adjustment device, comprising a drive unit, a backlash adjustment unit, and a control device;

• the drive unit comprising a first motor device, a first drive member, a linking member, a passive member, and a second drive member;
• the first drive member being connected with the first motor device and driven by the first motor device;
• the linking member being coaxially connected with the first drive member and linked by the first drive member, the linking member being disposed between the first motor device and the first drive member;
• the passive member being connected with the linking member and linked by the linking member to turn reversely;
• the second drive member being coaxially connected with the passive member and linked by the passive member, the second drive member and the first drive member being disposed at two sides of a driven member to drive the driven member, respectively;
• the backlash adjustment unit comprising a second motor device, the second motor device being adapted to bring the passive member to move linearly;
• the control device comprising a first driver, a first sensor, a second driver, and a driver control system;
• the first driver being adapted to output a first control signal to drive the first motor device;
• the first sensor being connected with the first driver and configured to sense a load current of the first driver, wherein when a backlash is generated between at least one of the first drive member and the second drive member and the driven member, the load current has a change;
• the second driver being adapted to output one of a second clockwise-turning control signal and a second counterclockwise-turning control signal to turn the second motor device clockwise or counterclockwise, the passive member being moved linearly to pull or push the driven member so as to adjust the backlash between one of the first drive member and the second drive member and the driven member;
• the driver control system being configured to control the first driver to output the first control signal and to receive the load current transmitted by the first sensor, wherein when the load current has a change, the driver control system controls the second driver to output one of the second clockwise-turning control signal and the second counterclockwise-turning control signal;
• characterized in that:
• the second drive member is provided with a pivot portion extending out of the passive member;
• the backlash adjustment unit comprises a screw member and a backlash adjustment member;
• one end of the screw member is connected with the second motor device and driven by the second motor device;
• the backlash adjustment member comprises a thread transmission end portion and a pivot end portion, the thread transmission end portion is threadedly connected with another end of the screw member, the backlash adjustment member is limited and unable to turn, wherein when the screw member is turned clockwise or counterclockwise, the backlash adjustment member is pulled or pushed to move linearly;
• the pivot end portion is pivotally connected with the pivot portion and turned by the passive member and the backlash adjustment member.