Helical gears operate more easily and gently compared to spur gears due to the way the teeth interact. The teeth on a volute gear cut at an associate degree angle to the face of the gear. When two of the teeth begin to interact, the contact is gradual, starting at one finish of the tooth and maintaining contact because the gear rotates into full engagement
Helical gears are one type of cylinder-shaped gears with slanted tooth trace. Associated to spur gears, they have the superior contact ratio and excel in quietness and less vibration and able to transmit large force. A pair of helical gears have the same spiral angle but the helix hand is opposite.
When the reference section of the gear is in the normal plane, by tilting the hobbing tool, the spur gear hobbing machine and the hobbing tool can be used to produce helical gears. Because of the twist of teeth, their industrial has the disadvantage of more difficult production.
The helical gears made by KHK can be categorized into two groups by the reference section of the gears being in the rotating plane (transverse module) and normal plane (normal module). If the reference section is in the rotating plane, the center distance is identical to spur gears as long as they are the same module and number of teeth. This allows for easy swapping with spur gears. However, in this case, they require special hobbing cutters and grinding stones, leading to higher production costs. On the other hand, if the reference section is in the normal plane, it is possible to use spur gear hobbing tools and grinding stones. However, the same component and number of teeth in spur gears no longer match the center distance of helical gears, and swapping becomes very difficult. In addition, the center distance is usually not an integer.
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