Crossed helical gears

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Crossed helical gears are gears that operate on non-intersecting, non-parallel axes.

The term crossed helical gears has superseded the term spiral gears. There is theoretically point contact between the teeth at any instant. They have teeth of the same or different helix angles, of the same or opposite hand. A combination of spur and helical or other types can operate on crossed axes.^[1]

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