Herringbone gear

[2] From the top, each helical groove of this gear looks like the letter V, and many together form a herringbone pattern (resembling the bones of a fish such as a herring).

The latter alignment is the unique defining characteristic of a Wuest type herringbone gear, named after its inventor Caspar Wüst-Kunz.

The W. E. Sykes Co. dissolved in 1983–1984, since then it has been common practice to obtain an older machine and rebuild it if necessary to create this unique type of gear.

[citation needed] Recently, the Bourn and Koch company has developed a CNC-controlled derivation of the W. E. Sykes design called the HDS1600-300.[promotion?]

Early Mors and Citroën cars used a herringbone bevel gear final drive in the rear axle.

This herringbone bevel gear was made by Citroën and installed around 1927 in the small Miřejovice hydropower plant on the River Vltava in the Czech Republic , connecting a Francis turbine to the generator. It worked flawlessly until 2011.
Black-and-white photograph of the side of a metallic wheel with pinions shaped as a wedge. On the left side, the head of an axis ends on a small gear. The edge of the gear rests on the metallic wheel with matching wedge pinions.
Citroën Type A final drive herringbone pinion and crownwheel