Assertion: gear | /r/CapableOf | rotate in same direction
Facets:
value: because of their low efficiencies
type: CAUSE
Source sentences:
text: Only used in limited situations are helical involute gears where the spirals of the teeth are of the same hand, and the spirals of the two involutes are of different 'hand' and the line of action is the external tangents to the base circles (like a normal belt drive whereas normal gears are like a crossed-belt drive), and the gears rotate in the same direction, such as can be used in limited-slip differentials[clarification needed] because of their low efficiencies, and in locking differentials when the efficiencies are less than zero.