Torq-Tenders are Overload Safety Devices with Torque Limiters which provide reliable overload protection. When a jam-up or excessive loading occurs the Torque Limiter will reliably and quickly release to prevent system damage.
These torque limiters are tamper-proof. Once installed, the torque value cannot be changed. This is an important feature that ensures the integrity of the machine design. Costly and potentially risky calibration procedures are not necessary. The torque value is controlled by the part number that is ordered. That value determines what spring is used during the assembly at the factory.
The torque value can be changed in the field, however; the torque limiter must be disassembled and the springs replaced to achieve the new torque value.
Standard Torq-Tenders are bidirectional. The torque value is the same regardless of rotation. If specified, these torque limiters can be configured at the factory to release at different torque ratings for different rotational directions.
In the coupling configuration, the Torq-Tender fulfills two functions: (1) A flexible shaft coupling (2) a mechanical torque limiter. The Torq-Tender in the shaft to shaft configuration will handle angular shaft misalignment up to 1.5 degrees and a .005” to .015” maximum parallel misalignment.
The enclosed design of the mechanical torque limiter enables it to operate in a wide variety of industrial environments. Special designs and materials can be made to withstand even more adverse conditions.
Zero-Max torque limiters are made from durable heat treated steel for a long operational life.
The torque value is determined by the force of the springs that are installed in the unit. The spring force acts upon the slides that are part of the inner shaft. These slides transmit force that will hold the drive key into an engagement slot in the outer housing. When the torque load exceeds the rating, (determined by precision tempered torque springs) the Torq-Tender’s drive key will pivot out of the engagement slot to disengage the Torq-Tender. After disengagement the torque limiter does not have significant resistance to rotation. Upon completion of one shaft rotation the torque limiter will automatically try to reengage. Once the overload is removed and speed reduced, the drive key will snap into the engagement slot and the Torq-Tender will be reset for the next overload event.