Gear is the machine element which has the function of transmit motion, it works by tooth meshing transfer torque.

It can work together with the other machine element that have teeth, (such as another gear or rack warm and so on ) to achieve the functions of changing the speed, torque, motion direction and motion way etc.

Gear is used extensively in the industrial products due to its advantages: high driving accuracy, wide range of application, high transmission efficiency and have the function to realize parallel shaft, intersecting cross-axis and interleaved shafts of the transmission between any two shafts.