Type CG Crossgard Clutch

CG Crossgard Clutches are a low cost, simple design suitable for general purpose applications. The clutches provide full overload protection of drives which require synchronisation to be maintained at all times. Following overload the clutches are automatically reset by slow rotation of input drive once the overload cause is cleared. Seven sizes of clutch provide a torque range 10Nm to 7150Nm with operating speeds to 700rpm. Torque settings are accurate to ±10% even after repeated tripping. Also can be supplied with roller chain or elastomeric coupling.

Type CGX Crossgard Clutch

High technology and precision is demanded in indexing and the position of equipment in modern machinery. The CCX Crossgard satisfies the demands for precision and performance and provides overload protection for modern machinery. CGX Clutches through their unique design provide backlash free, fail-safe, overload protection. High precision of trip torque is obtained with settings within ±3% accuracy, and very little motion is lost during tripping. An innovative ball and wedge mechanism is used to prevent backlash, and this is further employed in the coupling version to compensate for angular or parallel error or axial displacement with no loss in torsional rigidity. Five sizes of clutches and couplings have range 1.7 Nm to 785 Nm with maximum shaft speeds of 1400rpm. Units automatically reset after overload by slow shaft rotation.

Type CGZ Crossgard Clutch

The CGX Clutches incorporate a locking mechanism which restrains spring pressure being applied to the driving balls following an overload. Following an overload the input drive can continue to rotate freely enabling the clutch to be used for shaft speeds up to 1800 rpm. After the machine has been stopped following an overload the CGZ can only be reset by applying an axial load on the pressure plate. The clutch can also be used as an on-off clutch. Four sizes have torque range 2.4 Nm to 450 Nm, with accuracy ±10%. An elastomeric coupling is also available.

Safegard Type CS Overload Clutches and Couplings

The Safegard CSF Clutch uses a large number of equally spaced balls to provide the drive, and the clutch ratchets from one drive position to the next in the event of an overload. The design allows for high operating speeds, and the possibility to recapture drive in the event of an inertia created overload during starting, but do not provide any synchronisation between input and output.

The Synchron CSY Clutch uses 7 rollers unequally spaced to provide the drive, ensuring that there is only one position of engagement of the drive, enabling full synchronisation between driver and driven shafts.

The Safe Lift CSL Clutch has a retaining ring to prevent disengagement of the drive, but allowing sufficient movement to actuate a limit switch. This clutch is ideal on applications where components cross one another’s path, as synchronisation is maintained even when clutch has overloaded. The clutch also controls forward inertia drives.

The Contact-Free CSZ Clutch totally disengages in the event of an overload, and requires an outside force to be re-engaged. This enables the clutch to be operated at higher speeds, and also to be used on applications where it is undesirable to stop the motor quickly. The requirement of an external force to re-engage ensures the machine can be checked prior to a restart.

Safegard Series Clutches offer the following operating advantages:

• Long Service Life
• Cater for Frequent Overloads
• No Maintenance required
• Standardised Sizes
• Continued Operating Reliability
• Maintained Torque Accuracy
• Rapid Drive Disengagement
• Very Fine Torque Adjustment

The CZ and CN series Safegard overload clutches

The series was 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.

Series CZ Safegard overload couplings

Cross+Morse offer CZ Zero Backlash overload clutches combined with a torsionally stiff steel disc coupling for ultimate shaft-to-shaft positional accuracy or an Elastomeric coupling.

Safegard Type CMZ Overload Clutches and Couplings

The Safegard Series CMZ, Modular Rotation-Free Clutches, have been designed for overload protection in high torque, high speed and high inerta drives, to disconnect quickly the driven machinery from the motor in the event of an overload, allowing free rotation of the drive. The Clutches consist of a shaft mounted Hub which is connected to a flange on which a number of Torque Modules are mounted, these transmitting drive to an Output Flange, which is supported by Taper Roller Bearings on the Input Flange. The units are also available with Flexible Couplings.

Please contact our sales team for more details.