Backlash-Free Safety Couplings
Description: Safety couplings work as spring loaded positive couplings. The special roller or ball guides guarantee a totally backlash-free transmission of the torque in both directions of rotation. The couplings are therefore especially suitable for use in speed and direction controlled drives in conjunction with a closed control loop. Uniform loading of the rollers and balls guarantees high system stiffness, which is important especially for modern servo drives. The roller or ball guides simultaneously guarantee high reliability and switching frequencies when used with high dynamic servo drives. In the event of an overload the rollers or balls move out of the guides. This results in an axial movement, which activates a proximity switch or limit switch that immediately makes contact to switch off the drive. To avoid damage to the safety coupling, the drive must be switched off immediately after an overload. Gerwah backlash-free safety couplings were developed especially for dynamic drives operated under constantly changing directions of rotation and under high acceleration.
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