This high-performance clutch reduces CO2 emissions

Special solution for car manufacturing

How can the consumption and with it the CO2 emission of a vehicle be reduced? KEB Automation has addressed this question and developed an individually tailored solution: A new high-performance clutch that comes up with special performance features. 

One of the keys to reducing consumption in vehicles lies in the deactivation of a compressor. This is exactly where KEB came in and developed an electromagnetic friction clutch that is installed directly on the compressor. The clutch transmits a static torque of at least 50 Nm at a power of 35 watts and a rated current of 2.9A and achieves an operating speed of up to 20,000 revolutions per minute. With a maximum switchable differential speed of 11,000 revolutions, maximum slip times of 1,500ms and a friction speed of up to 75m/s, the electromagnetic clutch is characterised by particularly high performance. 

Challenging clutch development 

The development of such a high-performance solution, which took place together with a German car manufacturer, was a complex task, as Thorsten Nolte, Sales Engineer Brakes & Clutches at KEB, also knows. "A particular challenge was the adaptation into the existing installation space of the compressor. The connection to the compressor shaft had to be designed as a mountable and demountable connection," he says. "In addition, the overall length, weight and inertia had to be kept as low as possible - and cost-effectively."In addition, he says, ensuring torque transmission, covering a temperature range of minus 40 degrees to 160 degrees and creating a plug-and-play capability were aspects that had to be considered in the development process.

Patented functionality

The right solution was finally found - after testing various types of connection to the compressor shaft - in a non-rotating, deviation-neutral clamping hub. There are two friction linings in the rotor. While the outer lining is used to transmit torque, the inner lining is used to adjust the working air gap during final assembly of the clutch unit. The preset working air gap is maintained until the vehicle is put into operation. The functioning of this process is patent-protected. With a specially developed acoustic bonnet to reduce technical noise, the clutch also delivers a special highlight. 
"Each clutch unit has successfully completed an entire run-in cycle and is ready for immediate use on the engine. We are pleased to be able to offer vehicle construction real added value in terms of consumption reduction with the new high-performance clutch," concludes Nolte.

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Author: Tim Schöllmann