The main difference between the gear and the sprocket is: 1. The gear is involute tooth shape, and the sprocket is a "three arc straight line" tooth shape. 2. The gear is realized by the gear teeth of the two gears meshing with each other, and the two sprocket wheels are driven by the chain. 3. The gear can realize the transmission between the parallel shaft and any interlaced shaft, and the sprocket can only realize the transmission between the parallel shafts. 4. The gear transmits more torque than the sprocket. 5, gear processing accuracy, installation costs are higher than the sprocket. 6. The gear transmission structure is compact, and the sprocket can realize long distance transmission.