Engine idle gear

The utility model discloses an idle gear of an engine, and relates to the technical field of gears. The idle gear comprises an idle gear body, a clamping groove is formed in the middle of the side wall of the idle gear body in a penetrating mode, a first annular plate is arranged on one face of the idle gear body, a second annular plate is arranged on the other face of the idle gear body, the first annular plate comprises a first protection plate, and the second annular plate comprises a second protection plate. According to the idle gear, the idle gear body can be protected, transmission noise can be reduced, the idle gear body can be prevented from being damaged due to collision, the service life can be prolonged, when the idle gear body is installed, the idle gear body can be further fixed to external components through the arranged fastening bolts, and the idle gear is convenient to install. And the condition of slipping caused by vibration is avoided. 本实用新型公开了发动机惰齿轮，涉及齿轮技术领域；而本实用新型包括惰齿轮本体，惰齿轮本体的侧壁中部贯穿设置有