The present invention provides a positioning anti-backlash structure for combining a wheelchair with a joystick thereof, and the control lever is assembled on the wheelchair by using a positioning anti-backlash structure. The positioning anti-backlash structure mainly comprises: an assembly positioning frame, which is arranged on the front side of the wheelchair； The limiting recess is arranged at the front end of the assembly positioning frame according to the cross section of the tiger mouth； an arc guiding convex portion is arranged on the assembly positioning frame along an arc curve； a control lever pivot seat is disposed on the control rod； a card post is disposed on the pivoting block of the joystick, and the carding bar is selectively pivoted in the limiting recess, and constitutes a rotatable pendulum dynamic sample of the lever pivot seat relative to the assembly positioning frame； and a guiding The device is disposed on the pivoting block of the control lever to eliminate the gap between the limiting recess and the clamping rod, so as to tightly connect the lever pivoting seat to the assembly positioning frame.本創作係提供一種供結合輪椅與其操控桿之定位消隙結構，操控桿係利用定位消隙結構組配於輪椅上，定位消隙結構主要包括：一組裝定位架，係設於輪椅前側；一限位凹部，呈虎口斷面型態而設於組裝定位架前端；一弧形導引凸部，沿一弧曲線軌跡設置於組裝定位架上；一操控桿樞組座，設於操控桿；一卡接桿，設於操控桿樞組座上，卡接桿選擇性地樞組於限位凹部內，並構成操控桿樞組座相對組裝定位架呈可旋轉擺動態樣；以及一導引件，設於操控桿樞組座上，用以消除限位凹部與卡接桿之間的間隙，得以將操控桿樞組座緊密連接於組裝定位架。
