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Centrifugal Clutches & Brakes

Supplier: Norman G. Clark

Centrifugal clutches and brakes are used when input and output side should be separated during a standstill and the output side should work speed-dependant.

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Advantages of centrifugal clutches are load-free starting and slip-free torque transmission at operating speed. Centrifugal brakes are often used as emergency braking system. They can lower or slow down loads at a defined speed.

The most 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 the vast majority of drives, there is a wide range of clutch types and designs. Our sizes 01 to 13 cover – depending on engagement and operating speeds – a torque range up to ca. 2000 Nm.

Advantages of S-Type Clutches

In contrast to F-Type clutches, the linings of pin-guided clutches are permanently bonded to the flyweights 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.

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Advantages of P-Type Clutches

P-Type clutches are extremely narrow. In addition, the asymmetric pivot clutch is the quietest-running clutch in the SUCO product range. For this type of clutch, the performance factor for torque transmission is ca. 1.75 or ca. 1.25 depending on the direction of rotation.

Advantages of W-Type Clutches

The W-Type combines the advantages of F-Type and S-Type clutches. Because the tension springs are easily accessible and the linings removable, the parts subject to wear are easy to replace.

As with the S-Type, the guide pins 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 1.0.

Advantages of F-type Self-increasing Centrifugal Clutch

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 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 (2) are seated on the profi led hub (1) and are held against it by tension springs (3), which are hooked into the linings (4). 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 (5), and friction between the linings and the drum allows torque to be transmitted between the two.

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