Miniature herringbone gears Image credit: Run Ryder | Perpendicular herringbone gears Image credit: Wikimedia | Crossed double helix gear Image credit: 1 DKM 2B. Herringbone gears, also called double helical gears, are gear sets designed to transmit power through parallel or, less commonly, perpendicular axes. The unique tooth structure of a herringbone gear consists of two adjoining, opposite helixes that appear in the shape of the letter 'V'.
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