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For silent operation, helical gears are commonly used. Unlike spur gears, which have straight teeth and generate more noise due to the abrupt engagement of the teeth, helical gears have teeth that are cut at an angle to the face of the gear. This design allows for a gradual engagement of the teeth as the gears rotate, which results in smoother and quieter operation. Additionally, the overlapping teeth in helical gears distribute the load more evenly, further reducing noise and increasing the efficiency of the power transmission.