Gears that operate on parallel shafts with gear teeth cut in a twisted, oblique angle to the shaft are known as _____ gears.

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Helical gears are gears with angled teeth cut in a twisted, oblique angle to the shaft, which allows for quieter operation and better load distribution than spur gears. Hypoid gears also have angled teeth, but they are designed for perpendicular shafts. Worm gears operate on perpendicular shafts as well, with one toothed wheel and one screw-like rod.

Gears That Operate on Parallel Shafts with Gear Teeth Cut