What are the conditions for proper meshing of helical gears?

[EstherRose]

Conditions: The normal modules of the two helical gears must be equal; the normal pressure angles of the two helical gears must be equal; the helix angles of the two helical gears must be equal in magnitude and opposite in direction (for internal meshing, the directions should be the same). The advantages of helical cylindrical gears are as follows: 1. Excellent meshing performance: The meshing process between the teeth of helical cylindrical gears is a gradual transition, with the force on the teeth gradually increasing from small to large and then decreasing from large to small. Helical gears are suitable for high-speed and heavy-load conditions. 2. Large overlap ratio: The increase in overlap ratio enhances the load-bearing capacity of the gears, thereby extending their service life. The overlap ratio mainly depends on the meshing time, and helical gears have a longer meshing time and larger contact area, which reduces stress. This also ensures smooth transmission and improves economic efficiency.