RECLINER FOR CONCENTRICALLY ADJUSTING SEAT

A recliner for concentrically adjusting a seat, the recliner comprising two toothed plates (1, 2) which are respectively connected to a backrest and a seat basin, wherein the two toothed plates (1, 2) respectively mesh with a gear (3) located therebetween from two sides; a gap eliminating mechanism (6) is accommodated inside a central shaft hole of the gear (3); and the peripheries of the two toothed plates (1, 2) are fixedly connected together by means of a hoop (4). The gear is added between the two toothed plates to form two sets of gear-toothed plate matching mechanisms, such that an output end of the recliner rotates concentrically, thereby ensuring the concentric adjustment of the backrest, meeting the requirement of the recliner for fast and stable adjustment, and avoiding the problems of shaking, blocking point jamming and noise brought about during the process of operation of the recliner. At the same time, a gap adjusting mechanism matching two sets of gears-toothed plates is used, such that a gap in the recliner is eliminated, and the riding comfort is improved. In addition, the structure and part configuration of the recliner is simple, and a machining process therefor is easy to implement, such that the recliner has better application prospects.