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The SL Series of torque limiters offer half the inertia, and less than half the mass, allowing for a rapid and automatic recovery from torque overload even in the most advanced drive technology.

The SL Series utilizes the proven spring loaded ball detent system along with a previously patented preload for zero backlash operation. However, to achieve its target of 50% weight reduction, R+W embarked on a two year collaborative effort with local universities, designing the product from the ground up, rather than simply redesigning or optimizing existing products. The result is a torque limiter constructed from state of the art materials with unique surface treatments and innovative assembly technology – surpassing weight reduction targets and simultaneously reducing its footprint.

One example of this newly achieved size reduction is a torque limiter rated to disengage at 160Nm, which in the past would have had at best a mass of 1.3kg and a moment of inertia of 1.6 * 10-3kgm². It now weighs 370gm with a moment of inertia of 0.8 * 10-3kgm². 
 

The SL Series, just like previous R+W torque limiter designs, can handle more than 10,000 disengagement events, depending on rotational speed.

The four sizes (Series 30 / 60 / 150 / 300) cover disengagement torque values from 5Nm to 700Nm, and involve various mounting options, including both direct and indirect drive versions. Models SLN (clamping) and SLP (keyway) attach by flange to sprockets, sheaves, pulleys, and gears, and include an integral dual bearing system to support belt and chain tension when properly located over the shaft.

Models SL2 (bellows coupling) and SLE (servo insert coupling) mount in-line between two independently supported shafts, such as motor to ballscrew connections, and compensate for the small but inevitable misalignment which exists in this type of machine layout.

R+W America
Bensenville, IL
rw-america.com