What are the conditions for correct meshing of helical gears?

The correct meshing conditions for helical gears are that the normal modulus of two helical gears is equal, the normal pressure angle of two helical gears is equal, and the helix angle of two helical gears is equal in size and opposite in direction. These conditions are the foundation for the normal operation of helical gears.

As a special type of gear, helical gears have the following advantages:
Good meshing performance: The meshing process of helical cylindrical gears is a transitional process, where the force on the gears gradually decreases from small to large, and then from large to small. This makes helical gears suitable for high-speed and heavy-duty working conditions, improving the service life of the gears.

High degree of coincidence: Increasing the degree of coincidence can improve the load-bearing capacity of gears. The coincidence degree of helical gears mainly depends on the meshing time, and the long meshing time and large contact area of helical gears reduce stress. This makes the transmission more stable and increases fuel efficiency.

It should be noted that the meshing conditions of helical gears must meet the requirements of equal normal modulus of two helical gears, equal normal pressure angle of two helical gears, and equal helix angle of two helical gears with opposite directions. Only when these conditions are met can the helical gear work properly.