Helical gear transmission refers to gear transmission between cross-shafts composed of two paired helical gears, also known as cross-shaft helical gear transmission. Like cylindrical gear transmission between parallel shafts, the transmission ratio of helical gear transmission is equal to the inverse ratio of the number of teeth of the two wheels.

Because the sliding speed between the teeth is often very large, the transmission efficiency is low, and the wear is fast; the two tooth surfaces are in point contact, and the contact stress is large, so the bearing capacity is poor and the life is short.

Therefore, the helical gear drive is only used to transmit motion or small power.

The meshing condition of the helical gear is that the normal surface modulus and the normal surface pressure angle are equal. During the transmission process, there is relative sliding along the tooth direction and the tooth width direction, so the transmission efficiency is low and the wear is fast. In the auxiliary drive.