Cone clutch
A cone clutch serves the same purpose as a disk or plate clutch. However, instead of mating two spinning disks, the cone clutch uses two conical surfaces to transmit torque by friction. The cone clutch transfers a higher torque than plate or disk clutches of the same size due to the wedging action and increased surface area. Cone clutches are generally now only used in low peripheral speed applications, although they were once common in automobiles and other internal combustion engine transmissions. They are usually now confined to very specialist transmissions used in racing, rallying, or in extreme  off-road vehicles, although they are common in power boats, dredge pumps and other ship-drive lines. This is because the clutch does not have to be pushed in all the way and the gears will be changed quicker. Small cone clutches are used in synchronizer mechanisms in manual transmissions and some limited-slip differentials.