Having an inert and the idler gear of the engine

The present invention discloses an idler gear, including the main gear, pinion, sleeve, and attachment means; and the axial center of the main gear pinion bore and the bush are fitted; connecting means comprises at least three connections, the first connection member the first section of the mounting hole with the main gear, the second segment of the outer elastic member, and engaged with the gear of the second sub-mounting hole. In the transmission, the main gear idler gear meshed with the driving gear, a driven gear meshed with the pinion, the main gear drives the pinion is rotated by a coaxial connector, an elastic compression of the pinion generating member with respect to the pinion will make main gear rotates a small angle adjustment of the backlash idler gear with the driving gear and the driven gear, so that gaps are optimal, compared to the prior art, the idler gear capable of eliminating backlash shocks and vibrations caused by reducing gear during shock and vibration, to improve the transmission gear system stability. The present invention also discloses an engine having the above-described idler wheel.