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Built in Free Wheel / Integrated Free wheels FXM / RSCI series Hold back devices

Integrated Free wheels FXM / RSCI are sprag free wheels without bearing support and with sprag lift off.
The Sprag lift off ensures a wear free freewheeling operation when the inner ring rotates at high speed.
Nominal Torques up to 125500 N.m
Bores up to 230 N.m

Sprags in this design are fitted into a cage connected to the overrunning member. The sprag configuration is such that its centre of gravity is offset to its rotation axis.
Centrifugal forces creates a lift off moment against an engaging spring. The sprag tilts over to a contact free position.
The sprag height and its active profile length allow this type of freewheel to accept significant eccentricity tolerances and to work with all the current lubricants used in power transmission.





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Back Stop

This type is mainly used as a backstop. The inner ring (2) rotates together with sprag cage (3) in freewheeling direction. Each sprag (4) is individually spring Loaded (5) & precisely guided in the cage. The outer race is firmly secured to the stationary part of the machine. The cage is connected to the rotating inner race by means of drive pins & circlips. When disengaging speed is reached the sprags automatically disengage completely from the contact surface of the outer race & rotate contact free without any wear. This backstop do not have bearings of their own & these must be built in by the designer. To ensure faultless operation, inner & outer races have to be aligned exactly according to the permissible squareness & concentricity tolerances.(See example) Recommended shaft tolerance is h6 or j6 & centering spigot tolerance h6 or j6.