S-Type - Pin-guided clutch with three flyweights

The cylindrical hub (1) carries three flyweights (2) which are located by and can slide on cylindrical pins (3). Inside the flyweights, there are tension springs (4) which restrain neighbouring flyweights until centrifugal force overcomes the spring force. Then the flyweights lift from their seats and the linings (5) on the flyweights contact the inside diameter of the clutch drum (6). Friction between the linings and the clutch drum allows torque to be transmitted.

In contrast to F-Type clutches, the linings of pin-guided clutches are permanently bonded to the fl yweights instead of being mounted on loose carriers. The guide pins of W-Type clutches provide accurate guidance for the flyweights, which ensures quiet operation of the clutch.
For this type of clutch, the performance factor for torque transmission is ca. 1.5.