Special gear for diesel engine

The utility model discloses a special gear for a diesel engine, a gear main body is used for being meshed with an adjacent gear to play a transmission role, and a protection module is used for protecting teeth on the gear main body to prevent the teeth on the gear main body from being abraded to influence the transmission of the gear main body. The protection module comprises gear sleeves connected to the teeth of the gear body in a sleeving mode, annular rubber bands symmetrically fixed to the two sides of the gear sleeves and protrusions fixed to the outer side faces of the gear sleeves in a rectangular array mode, the gear sleeves are arranged in an annular array mode, and the adjacent gear sleeves are integrally connected and used for being connected to the teeth of the gear body in a sleeving mode to protect the teeth of the gear body. According to the special gear for the diesel engine, friction between gears of the diesel engine is transferred into friction between gear sleeves, and the gear sleeves be