What is a herringbone gear and what are the advantages of a herringbone gear?

Helical gears have a lateral force on the axis. In order to eliminate this force, a gear is made into a helical gear with symmetrical opposite directions to eliminate this force. It looks like a herringbone, which is called a herringbone gear for short. Herringbone gears have the advantages of high overlap, small axial load, high load-bearing capacity, and stable operation. The herringbone gear base is used to transmit the torque of the main motor or motor unit to the roller. Herringbone gears cannot be processed by gear shaping or hobbing.
Herringbone gear advantages:

1. Herringbone gears have a high degree of overlap, with at least 2 teeth meshing at any time.
2. The meshing process between the teeth of herringbone cylindrical gears is a transitional process, and the force on the gear teeth gradually increases from small to large, and then from large to small; herringbone gears have high load-bearing capacity and stable operation.
3. Herringbone tooth theory Because the tooth helix angles are in opposite directions in the symmetry direction, there is no or very small axial force.