Why is the bearing capacity of helical gears higher than spur gears?
From another point of view, the same tooth ring diameter, the same thickness of the helical gear of the actual length of the gear is longer than the actual length of the spur gear, the force area is also large, so the carrying capacity is strong.
A pair of parallel shaft helical gear meshing, the gear tooth width is gradually entering the mesh, gradually from meshing helical gears, increasing the length of contact line width from zero, and gradually shortened, until the load is not suddenly out of contact, add or remove, so the work of helical gear tooth more stable.
When the spur gears engage, the contact lines of the tooth surfaces are parallel to the axis of the gears. The teeth are along the tooth width, while simultaneously meshed disengaged, so the load along the tooth width and suddenly unloading stability of spur gear transmission is poor, prone to noise and impact, therefore not suitable for transmission in high speed and heavy load
