Gear clearance eliminating transmission mechanism

The invention discloses a gear clearance eliminating transmission mechanism which comprises a rotary table seat (1), a driving gear (7), a clearance eliminating gear (8) and a hirth coupling (9), wherein an end surface bearing (14) is mounted on the end surface of the driving gear (7); and the clearance eliminating gear (8) sleeves a central spindle of the driving gear (7) and is pressed on the end surface bearing (14) axially. The gear clearance eliminating transmission mechanism can ensure that the staggered angle between the clearance eliminating gear and the driving gear is adjusted in a real-time manner according to the width of a spline, and is low in processing difficulty, high in manufacturing precision, and high in rigidity.