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LuK develops twin clutch unit for series production

Engines with high torque outputs and operating speeds can take conventional clutches to their very limit. Increasing the diameter of the plates is an easy solution but packaging constraints may preclude this and bursting strength can be a problem.

LuK, part of the Schaeffler group, has developed a self-adjusting twin-plate clutch for series production. Target applications are drivetrains rated above 500Nm.

Accommodating a second plate increases the length required to house the clutch, typically by 17-20mm, but LuK says this is outweighed by the advantages of the new design:

•Reduced actuation force (approximately 40 per cent);

•Self-adjusting (SAC), therefore constant actuation force for the life of the clutch;

•Increased thermal capacity, so diameter may be reduced.

The BMW M5 is the first production application, and will use an internally ventilated contact plate, reducing thermal load on the clutch. It is scheduled to reach the US in the final quarter of this year. Its V10 engine spins to more than 8000rpm and produces 507bhp and 520Nm.

Customer development projects have also included twin plate clutches with a torsion damper incorporated in the clutch disc.