Q: What type of gears are silent gears?

A: High-precision products whose teeth are ground are silent gears. Compared to spur gears, helical gears have a high degree of "overlap", so they can achieve quieter rotation. Plastic gears are also silent gears. (However, the strength is reduced.)

Q: What type of gears have high rust resistance?

A: Stainless steel and plastic gears have high rust resistance. Plastic gears can be used without lubrication. However, since plastic gears tend to heat up and expand when meshing, it is better to use metal gears.

Q：What is backlash?

A：Gap is the clearance between the teeth when a pair of gears are meshed. To achieve a smooth rotating transmission, a pair of gears needs backlash.

Q: Is it possible to completely remove the backlash?

A: There are no KHK standard gears with zero backlash. However, there are products that can be adjusted to the minimum clearance. For example, "Bevel rack & pinion" and "Double lead worm gear".

Q: How much can the strength be improved by quenching treatment?

A: For SS spur gears made of S45C, the strength of tooth surface can be increased by 4 times after high frequency quenching treatment. However, the accuracy of the reverse side and tooth pitch error will be reduced by one grade.

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