Schaeffler tests dust-free wet lamella brake in DTM Innovation Taxi for future e-axles

The Schaeffler Innovation Taxi, an Audi R8 LMS GT2, has been a fixture at DTM race weekends since 2023. At the DTM race weekend at the Nürburgring from August 14 to 16, it will feature an innovative wet lamella brake for the first time. The taxi is used to demonstrate how new technologies mature under racing conditions.

The wet lamella brake is a pre-development project for series production. It is emission-free regarding brake dust, operates quietly and is designed for maintenance-free operation. The focus of testing is functionality and service life under the toughest conditions, particularly torque and friction stability. Due to its concept and packaging constraints, the unit, also referred to as a wet brake, has been integrated into the rear wheels of the Innovation Taxi. External influences such as moisture no longer cause corrosion, resulting in stable friction conditions and consistent performance.

A particular challenge is dissipating the high thermal loads generated by the enclosed rear-wheel brake. To address this, Schaeffler has developed a dedicated thermal management system with hydraulic pressure and suction pumps as well as multiple heat exchangers. The data and experience derived from this form the basis for designing an efficient lubrication strategy for future e-axles with an integrated braking system.

The development goal is a highly integrated system unit for electric axles, combining the brake, actuator and oil/cooling circuit. In the long term, this could help replace conventional steel or drum brakes in suitable applications. A first concept vehicle with an integrated lamella brake was already presented to selected customers at the Schaeffler Automotive Symposium in Bühl last June. The prototype is now being shown to the general public for the first time at the DTM race at the Nürburgring.