herringbone gear

noun

1. a helical gear having teeth that lie on the pitch cylinder in a V-shaped form so that one half of each tooth is on a right-handed helix and the other half on a left-handed helix.

noun

1. a gearwheel having two sets of helical teeth, one set inclined at an acute angle to the other so that V-shaped teeth are formedAlso called: double-helical gear