ABSTRACT
Pinions 2 and 7 are engaged and rotate in opposite directions. Clutch 4 connects pinion 2 with pinion 9 engaged with output gear 11, and this is the forward running. Clutch 8 connects pinion 7 with pinion 10 that is also engaged with gear 11, and this is the reverse. Thus, output shaft 12 changes its direction of rotation depending on which clutch, 4 or 8, is closed. The required relation between the angular speed in the forward running and in backing can be achieved by changing the tooth numbers of items 2, 7, 9, and 10.
