The utility model discloses a catch formula flywheel sync ware of gearbox, including main shaft, output axle sleeve, it has the spout to distribute on the lateral wall of main shaft, is equipped with metal slip in the spout, and the slider is equipped with the lug on keeping away from the lateral wall of main shaft, still installs radial pressure spring on the main shaft, is equipped with the internal spline on the endotheca face of output axle sleeve, and the last external splines that is equipped with of spindle outer wall is equipped with annular groove, its characterized in that on the interior jacket wall of output axle sleeve: the one end that the slider is close to main shaft lateral shifting is equipped with transition elastomeric element, and transition elastomeric element sets up in transition department of slider with the lug. The utility model discloses a set up transition elastomeric element for the contact inclination grow of lug and spout prevents to drop, and the elastomeric element's that passes through simultaneously angle can constantly be reduced along with the work of synchronous ware, makes at the in -process of shifting the smooth level and smooth work of synchronous ware.