CZ/CN Zero Backlash Safegard Overload Clutches
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Series CZ and CN Zero Backlash Safegard Overload Clutch Te l : + 4 4 1 2 1 3 6 0 0 1 5 5 Zero backlash Overload Clutches and Couplings, series CZ and CN, available in 8 different basic types, and 12 basic sizes, for shaft diameters from 8mm to 60mm; providing Overload Protection for Torque values from 5Nm to 740Nm. The CZ series Safegard overload clutches were developed to provide a totally backlash free transmission of power with a very responsive overload protection. These compact units are directly interchangeable with existing designs in the market providing a cost advantage with long reliable service life. Two basic modes of operation are available, the basic CZF/CNF Safegard ratchetting design with the driving balls equally spaced so that clutch can re-engage after a small angle of rotation, and the Synchron CZY/CNY design with the balls unequally spaced so that clutch can only re-engage after a full revolution so providing full synchronisation between driver and driven. Responsive overload reaction is obtained by the use of negative functioning Disc Springs to apply drive load. In the event of an overload the spring load actually decreases, allowing faster dis-engaging of the drive, and minimal pressure on the driving surface in the dis-engaged mode, reference diagrams below. ENGAGED DISENGAGED At Maximum Torque Setting ENGAGED DISENGAGED At Minimum Torque Setting During normal operation the CZ/CN Overload Clutches transmits the torque from the Hub (1) to the Flange (3) by a number of hardened steel balls (4) located in pockets in the Hub, and forced into matching seats in the Flange by the Disc Spring (6) applying load to the Pressure Flange (2). In the event that the Driving Torque exceeds the pre-set value, the reaction forces on the Steel Balls exceeds the force applied by the Pressure Flange, and the Balls start to ride-up out of their seats in the Flange (3). This action reduces the spring load, so allowing the Balls to quickly come out of their seats, so releasing the drive. The action of the Balls dis-engaging moves the Pressure Flange to the right so activating the stop switch (9). Re-engagement is automatic once the torque level drops below the pre-set value. The Synchron design re-engages only at one angular position to keep Hub and Flange accurately synchronised at all times. The Disc Springs work only in the negative area of their characteristics so unscrewing the Adjusting Nut (7) increases the axial load of the Springs, so increasing dis-engaging torque. When desired Torque setting is achieved the Adjusting Nut is locked by the Bolt (8) being screwed into the locking Collar (10). Email: sales@crossmorse.com

Series CZ and CN Safegard Overload Clutch CZ/CN Series Clutches and Couplings Torque Adjustment Te l : + 4 4 1 2 1 3 6 0 0 1 5 5 Referring to drawing alongside Torque setting of the Clutches can be made using either a suitable size ‘C’ Spanner (A), or a correct size Pin Wrench (C). First release Adjusting Nut (7) by removing the Locking Screw (8), then rotate the Nut clockwise until at end of stroke (do not apply excess force). Then rotate nut back anti-clockwise by one indent to reach the neutral position, corresponding to minimum torque. Then continue to turn Adjusting Nut anti-clockwise...

Series CZ Safegard Overload Clutches Standard Plain Bore Units Type K Standard Zero Backlash Clutches types H&K These clutches are intended for keyway connection to shafts where pre-machined synchronisation is the preferred design. Type H is used to mount compact drive systems with minimal overhung load, the single deep groove ball bearing providing full radial support for the sprocket, pulley, or gear. Type K has an extended inner race to support a second Bearing to allow fitment of wider transmission elements, and where high radial loads may be encountered. CZ Series types H & K -...

Series CZ Safegard Overload Clutches Standard Units With Expanding Bush Shaft Connection Type L has extended inner race to support a second bearing to enable fitting of wider transmission elements. Torque Range according to Spring selection CZ Series types J & L - Technical Capacities Bore Size 'M1' min max mm mm Weight kg Type Type J L Hub Inertia kgcm2 Type Type J L Models* J&L Clutch Size *For clutch Part No. for ordering refer to page 30. CZ Series types J & L - Dimensions Clutch Size Email: sales@crossmorse.com For Limit Switch location and operation refer to page 29. Always use limit...

Series CZ Safegard Overload Couplings Standard CZ series Zero Backlash Overload Clutches combined with a Torsionally stiff. Steel Disc Coupling for ultimate shaft to shaft positional accuracy, with full overload protection. Available with keyed shaft connection, or totally keyless with shaft clamping elements. CZ Series Couplings types M & N - Technical Capacities Hub Inertia Flange Inertia Max. Misalignment Coupling Type Type Type Type M M N N Axial Angular kgcm2 kgcm2 kgcm2 kgcm2 degrees mm 0.4 1 2.15 2.22 2.42 2.47 Speed Models Torque Range Coupling Type M Bore Sizes Coupling Type N Bore...

Series CZ Safegard Overload Couplings Standard Keyless Connection Overload Clutches with Elastomeric Couplings Type R Te l : + 4 4 1 2 1 3 6 0 0 1 5 5 Couplings type T is identical to type P except coupling hub is not split, and hub suitable for standard reworking Couplings are supplied standard with 92 Shore rubber inserts, but 98 shore can be supplied to order CZ Series Couplings types P, R & T - Technical Capacities For Clutch Part No. for ordering refer to page 30. *max bore achievable only with keyway according to DIN 6885 Sheet 3 CZ Series Couplings types P, R & T - Dimensions Models...

Standard Zero Backlash Clutches types H&K Series CN Safegard Overload Clutches Standard Plain Bore Units These clutches are intended for keyway connection to shafts where pre-machined synchronisation is the preferred design. Type H is used to mount compact drive systems with minimal overhung load, the single deep groove ball bearing providing full radial support for the sprocket, pulley, or gear. Type K has an extended inner race to support a second Bearing to allow fitment of wider transmission elements, and where high radial loads may be encountered. Torque Range according to Spring...