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More important than ever
Only mechanical torque limiting clutches offer reliable overload protection
Over the past 40 years, the development of the posi t ive- locking, torque l imi t ing clutches was strongly influenced by technical advancements in electrical drives. Demands for higher performance density, dynamics and speed changed the constructional design and led to a large diversity of variants. Torque limiting clutches are more important than ever in modern drive axes for the prevention of expensive overload damage in modern drive axes. The protective functions integrated into today's machine control units are an expedient supplement to the mechanical torque limiting clutch, but not a replacement.
Early electrical drive technology frequently transferred speed and torque via flat belts. The frictionally locking power transfer ensured per se that the level of the torque remained within limits. If a blockage occurred, the flat belt slipped through, thus preventing an uncontrolled increase in torque. In addition, production speeds were comparatively leisurely and the systems were generously dimensioned. If torque limiting clutches were used, they were frictionally locking slip clutches. There was no demand for the positive locking, mechanical torque limiting clutches generally used now. Their successful era began approximately 45 years ago.
- More than 40 years ago, mayr Antriebstechnik launched the first torque limiting clutches (EAS) onto the market which switched off electrically.
The Mauerstetten company mayr Antriebstechnik has dedicated itself to drive technology since its foundation in 1897. Originally, they manufactured transmissions for mills and sawmills which were driven by water wheels. The entry into "modern" drive technology came in the middle of the 50's, when the company started to produce flat and V-belts. The mayr -torque limiting clutches were first designed in the year 1958. The German patent office issued the company with the first industrial patent rights for slip clutches. The first positive locking EAS-clutches were launched onto the market in 1963. These ball detent torque limiters were subject to backlash. The torque was transferred via keyways and claws from the hub onto the output side, and the standard shaft-hub connection was the key. As electrical drive technology advanced in the direction of high speeds and higher dynamics, the requirements for backlash-free torque transmission became increasingly important.
As pioneer and market leader for mechanical torque limiting couplings, mayr Antriebstechnik quickly latched onto this new trend, and have strongly influenced it since that time. The first backlash-free torque limiting clutches were introduced in 1980. The torque transmission was undertaken by a spring steel disk screwed on alternately to the hub and the output flange. The key as a shaft-hub connection was replaced by backlash-free clamping elements.