SAFETY COUPLINGS

Direct Drive Safety Couplings

Indirect Drive Safety Couplings

Safety couplings are used to minimize expensive damage when a collision occurs in a high performance servo drive system. When a collision occurs, the safety coupling will stop the destructive inertial forces instantly and eliminate downtime and repair costs often associated when just an overload relay is used.

Safety couplings are spring loaded form fit couplings that transmit torque through the use of a special degressive cup spring in which the hardened and polished balls are preloaded into the spherical indentations. When an overload occurs, the hub (with its ball cage) will over twist and press the balls out of the indentations to disengage. Only the balls and cup spring move axially resulting in a very low disengagement mass. A proximity switch is used to initiate an emergency stop to shut the servo motor down.

Automatic
Re-engagement Versions

Bearing Support Versions

Integrated ball bearing or sliding bearing to support the pulley. This eliminates the need for support inside the pulley and allows for a more compact overall design.

 

Degressive Spring Curve

Special springs were developed to operate on the diminishing side of the spring curve resulting in immediate torque drop off at activation and reduced destructive forces and damage.

 

CLAMPING METHODS

Aluminum Radial Clamping Hub (also available in steel and stainless steel)

• High tensile strength, low weight aerospace aluminum provides very low inertia for better system performance.
• Balancing Plug is positioned at a precise angle in the hub for balanced, high speed performance.
• Precision machined involutes (not a die cast).
• Zero backlash torque transmission is guaranteed through the elimination of keyways.
• Only one clamping screw allows for fast installation.

• New EASY Clamp System prevents damage to hubs for easy shaft mounting and dismounting while compensating for tolerance differences between shaft and hub. (Available on select couplings.)
• Simply loosen the clamping screw against the pin to expand the clamping hub for easy shaft mounting and quick installation.

Steel Conical Bushings (also available in aluminum versions)

• High clamping forces to insure safe transmission of torque and backlash free connection.
• Additional draw-off holes provide easy hub removal.
• Unique hub design offers shortest coupling length.

CONNECTION METHOD

Brass Wire Press-Fit Connection

• Mechanically formed between hub and multi-layered bellow for a strong zero backlash connection.
• No glue connection insures connection in high temperature, chemical sensitive applications.

TORQUE TRANSMISSION ELEMENTS

Bellows

• Guarantees a zero backlash torque transmission with extremely high torsional stiffness while maintaining flexibility for compensation of misalignment.
• Low mass moment of inertia for increased system performance.
• Maintenance free up to temperatures of 300°C (572°F).
• Depending upon torsional stiffness requirements, lateral spring rates and lengths, standard bellows are available in 2, 4 and 6 corrugations. For longer lengths, cust om manufacturing is available.

Elastomers

• Elastomers vary in hardness values from 98 Shore A (red) for maximum dampening capabilities to the 72 Shore D (white) where higher stiffness is required.
• Excellent electrical insulator to prevent the transfer of electrical fields.
• Involute shaped teeth provide easy plug-in assembly for long and durable life.