If the force drops, springs bring about the clutch to launch. Evenly spaced ridges, named splines, line the inside and outside from the clutch to lock in to the gears and also the clutch housing. You could browse more details on these clutches in How Automated Transmissions Operate. This diagram https://clutch-kereta76318.webbuzzfeed.com/33550409/the-smart-trick-of-clutch-plate-that-no-one-is-discussing