Driven gear assembly of engine

The invention discloses a driven gear assembly of an engine. The driven gear assembly consists of a driven gear, a separable gear and tension spring pieces; the driven gear and the separable gear are axially fixed through a retainer ring; the tension spring pieces are assembled between the driven gear and the separable gear; and a locking screw is also arranged between the separable gear and the driven gear to control the radial relative motion of the separable gear and the driven gear. The tension spring pieces have semi-arc shapes, the number of the tension spring pieces is two in symmetry, one end of one tension spring piece is fixed on the separable gear through a positioning pin, while the other end is fixed on the driven gear through a positioning pin; and two ends of the other tension spring piece are in the opposite mounting direction of the previous tension spring piece, and the rotating torque of the tension spring piece is in the opposite rotating direction of the driven gear. The driven gear assembly of the engine has the advantages of simple and compact structure and capability of uniformly and effectively eliminating backlash so as to eliminate the engagement impact noise of the gear.