The figure shows the vacuum clutch system. This sort of clutch takes advantage of the prevailing vacuum in the engine manifold to operate the clutch. The vacuum clutch consists of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  The transmission major shaft is linked to the hub https://edgarwvtqo.goabroadblog.com/32170145/top-latest-five-clutch-kereta-urban-news