Chain belt and gear drive device of engine

The invention discloses a chain belt and a gear drive device of an engine. The chain belt is in engagement drive with the engine gear when the engine is started to work; a group of engagement holes are arranged in the chain belt at an identical interval in the length direction of the belt, and the intervals and the sizes of the engagement holes are matched with the engine gear. By integrating the characteristics of the timing belt and the timing chain, the chain belt has the advantages of lighter weight, smaller occupied space, precision drive and low maintenance cost. During the drive, the gear inserting is softer, the impact is smaller, the operation is more stable, the chain belt is not provided with the noise-making chain roller structure, and therefore the chain belt is better than the conventional timing belt in the noise level.