Advantages of centrifugal clutches are load-free starting and slip-free torque transmission at operating speed.
The centrifugal brakes are often used as an emergency braking system. They can lower or slow down loads at a defined speed.
The important factor for selection of a centrifugal clutch is the amount of power to be transmitted. Knowing the power available from the drive motor and the operating speed, the torque to be transmitted can be calculated and the size of the clutch determined.
For majority of drives, there is a wide range of clutch types and designs. Norman G Clark’s sizes 01 to 13 cover – depending on engagement and operating speeds – a torque range up to ca. 2000Nm.
Advantages of the self increasing centrifugal clutch
The compact design and self-increasing effect allow this clutch to transmit remarkably high torques while requiring little space, resulting in a performance factor of ca. 2.5.
As the tension springs are easily accessible and the linings removable, the parts subject to wear are easy to replace.
Since the linings are not secured to the flyweights, some noise is possible in service, but normally not sufficient to cause a nuisance.
Self-increasing effect: The profiled hub has a special form, which causes a wedging effect between the profile and the flyweights when torque is applied to the clutch. This results in an additional force on the linings and allows a higher torque to be transmitted.
Construction and mode of operation
The flyweights are seated on the profiled hub and are held against it by tension springs, which are hooked into the linings.
The discs locate the flyweights axially. Each lining has a crimping on its inner surface to locate it on the flyweight. This prevents the linings from moving sideways.
As the profiled hub rotates, the centrifugal force acting on the flyweights overcomes the spring force. When the speed is high enough, the linings contact the clutch drum, and friction between the linings and the drum allows torque to be transmitted between the two.