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F-Type Self-increasing clutch
Construction and mode of operation
The fl yweights 2 are seated on the profi led hub 1 and are held against it by tension
industrial springs 3 , which are hooked into the linings 4 . Discs locate the fl yweights axially. Each lining has a crimping on its inner surface to locate it on the fl yweight. This prevents the linings from moving sideways.As the profi led hub rotates, the centrifugal force acting on the fl yweights overcomes the spring force. When the speed is high enough, the linings contact the clutch drum 5 , and friction between the linings and the drum allows torque to be transmitted between the two. 1 Hub 2 Flyweights 3 Tension spring 4 Lining 5 Clutch drum
Advantages
The compact design and self-increasing effect allow this clutch to transmit remarkably high torques while needing very little space, resulting in a performance factor of ca. 2.5.Because the tension springs are easily accessible and the linings removable, the parts subject to wear are easy to replace. Because the linings are not secured to the fl yweights, some noise is possible in service, but normally not suffi cient to cause a nuisance.Self-increasing effect: the profi led hub has a special form which causes a wedging effect between the profi le and the fl yweights when torque is applied to the clutch. This results in an additional force on the linings and allows a higher torque to be transmitted. Directionof rotationSelf-increasing effectCentrifugal forceEffective centrifugal force
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