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Freewheels
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Freewheels Backstops • Overrunning Clutches • Indexing Freewheels Edition 2020/2021 RINGSPANN® Registered trademark of RINGSPANN GmbH, Bad Hombu

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Freewheel Technology Introduction Design and Function of Freewheels Areas of Application for Freewheels Freewheels with Sprags or Rollers Types for Extended Service Life Determination of Selection Torque Freewheel Selection Used as Complete Freewheels Backstops Overrunning Clutch Indexing Freewheel With bearing support for bolting to the face FB with sprags, available in four types FKh with hydrodynamic sprag lift-off with mounting flange 160 000 BA with rollers or with sprag lift-off X BC with rollers or with sprag lift-off X FA with sprags and grease lubrication FAV with rollers and...

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Integrated Freewheels Backstops Overrunning Clutch Indexing Freewheel With bearing support FXRW with sprag lift-off X FXRU with sprag lift-off X and with release function FXM with sprag lift-off X FON with sprags, available in three types for bolting to the face, with torque limiting Internal Freewheels Backstops Overrunning Clutch Indexing Freewheel With bearing support for press fit on the outer ring 20 500 FXN with sprag lift-off X FZ with sprags and bearing support FZ … 2RS with sprags, bearing support and seals FZ … P2RS with sprags, bearing support and seals FZ … P with sprags and...

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Design and Function of Freewheels Freewheels are machine elements with particular characteristics: • In one direction of rotation there is no contact between the inner and outer ring; the freewheel is in freewheeling operation. • In the other direction of rotation there is contact between the inner and outer ring; in this direction it is possible to transmit high torque. For example the outer ring of the freewheel shown in figure 4-1 can freewheel clockwise while the inner ring is stationary. If, however, the outer ring is turned in the opposite direction, there is contact between the inner...

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➧ Backstop Freewheels are used as backstops if reverse rotation of the operating direction is to be prevented. In many machines and installations, for technical safety or functional reasons, it is necessary to ensure that you are working in just one specified direction of rotation. This is why there are legal stipulations requiring a mechanical safety device for the operation of, e.g. conveyor systems. The normal operating mode of a backstop is freewheeling operation; the locking (torque transmission) is performed at zero speed. The immediate engagement of the clamping elements ensures the...

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Areas of Application for Freewheels ➧ Areas of application for Backstops Gear units Electric motors Gear motors Inclined conveyors Elevators Bucket elevators The backstop prevents reverse rotation in a drive of a conveyor installation if the power fails or the motor is turned off. The backstop prevents reverse rotation of the conveyor load if the power fails or the motor is turned off. ➧ Areas of application for Overrunning Clutches Textile machines Printing machines Fans Ventilators During normal operation of textile or printing machines, the overrunning clutch separates the barring drive...

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Fans Ventilators Pumps Compressors The backstop prevents reverse rotation under the back pressure of the conveyed medium if the motor is turned off. The backstop prevents reverse rotation under the back pressure of the conveyed medium if the motor is turned off. Pumps Generators Roller conveyor In multimotor drives the overrunning clutch disengages the inactive or lower speed drive. The overrunning clutch ensures that the conveyed material can be pushed or pulled faster over the rollers than the speed of the drive. High voltage switches Seed spreader In high voltage switches for tensioning...

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Complete Freewheels • With bearing support between inner or outer ring • Completely enclosed • With own lubrication • Connection to the outer ring and the customer part by: - bolting to the face (figure 8-1), - mounting flange, - keyway connection on the outer ring, - lever arm or - shaft coupling. Low Speed Backstop • With bearing support from inner to outer ring • Completely enclosed • With own lubrication Housing Freewheels • With bearing support between inner and outer ring • Completely enclosed by its own housing • With own lubrication • With bearing supported input and output shafts •...

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Basic Freewheels • With bearing support between inner and outer ring • For assembly with connecting parts • Lubrication – if necessary – to be provided by the customer Integrated Freewheels • Without bearing support. Concentric alignment of inner and outer ring must be provided by the customer. • Integrating the outer ring on the customer part by bolting to the face • Lubrication – if necessary – to be provided by the customer Internal Freewheels • Series both with and without bearing support. In the case of series without bearing support, concentric alignment of the inner and outer ring...

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Freewheels with Sprags or Rollers two different designs of freewheels Design as Sprag Freewheel The sprag freewheel has outer and inner rings with cylindrical tracks. The individually spring loaded sprags are arranged in between the rings. The freewheel locks without slipping. Different sprag profiles enable a multitude of types. Types are available for: • High torques • Contactless freewheeling operation • High indexing accuracy 10-1 Function of Sprag Freewheels With the sprag arrangement illustrated in figure 10-2 the outer ring can be turned freely clockwise (freewheeling operation), if...

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Design as a Roller Freewheel With roller freewheels either the inner or the outer ring has roller ramps. The other ring has a cylindrical track. The individually spring loaded rollers are arranged in between the rings. The freewheel locks without slipping. Function of Roller Freewheels With the version illustrated in figure 11-2, the outer ring can be turned freely clockwise (freewheeling operation), if the inner ring Locking direction or driving operation Freewheeling direction or freewheeling operation • is at a standstill, • is turned counterclockwise or Spring force Outer track • is...

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