Kreisel Sala 2-speed transmission Detail 2 - Kreisel Electric

Austrian battery pioneer launches a revolutionary, automated 2-speed transmission for electric vehicles.

The young high-tech company from Austria, which consistently implements its vision of an electrical future with innovative products and solutions, is making a stir with another world innovation. An automated 2-speed transmission for electric mobility applications in combination with an integrated powertrain architecture specially developed in cooperation with Sala Drive GmbH – both designed for high performance and torque ranges. “We have set ourselves the demanding task of building an ultra-light, electric supercar based on a historic sports car as the ideal application for our transmission,” says Markus Kreisel, CEO of Kreisel Electric. The challenge here is that there is nothing even remotely like a standard component available here, no matter where you look. “So we developed the essential components ourselves on the basis of our own requirements profile,” Markus Kreisel continues.

For example, the automated 2-speed transmission not only had to be able to guarantee unique acceleration values and top speeds, but also act as a reliable link between a high-performance powertrain and a correspondingly powerful and lightweight battery, which was also specially developed for the vehicle. The result is at the same time an experience in itself and very impressive. The sports car, which was already on show at Techno Classica in Essen in April 2017, sprints from 0 to 100 km/h in around 2.5 seconds, achieving a top speed of above 300 km/h. And all this with a range that is not only impressive in the supercar category: with a single battery charge you can easily break the magic range limit of more than 350 km.

So what are the ingredients for the success of the Kreisel Electric 2-speed transmission? “An electric lube oil pump with integrated oil reservoir that self-enables on demand for maximum efficiency. Massively reduced drag losses due to a friction-optimized bearing arrangement. Electromechanical gear synchronization, which ensures the shortest torque interruptions through optimized torque and speed control of the electric drive during lightning-fast, 0.25-second gear shifts. In this way, any thermal impact by friction elements and possible wear effects on the shift components can be practically eliminated. A limited slip differential lock, which is also integrated, ensures uninterrupted torque transmission even in slippery road conditions. And last but not least, a modular interface that supports a wide range of applications for motor and transmission arrangements,” explains Philipp Kreisel, who is also a CEO of Kreisel Electric. In a maximum expansion stage, e.g. through the use of more powerful electric motors, breathtaking output values of 600 kW and an input torque of up to 900 Nm can be managed in this way. Using innovative approaches to complete vehicle integration, the center of gravity of the lightweight sports vehicle was lowered even further to achieve optimum handling with a weight ratio of 37% (front): 63% (rear). There is also a great deal of intelligence, variability and flexibility in the entire setup. A large number of sensors continuously monitor all relevant components and combine the collected data in real time in a transmission control unit (TCU). The modular powertrain arrangements allow for 1 or 2 motors per axle just as easily as a single motor. And for applications that also require high torques, such as small and medium-sized transporters up to 3.5 tons or trucks and buses up to 15 tons, the automated 2-speed transmission can be easily be adapted to match.

All this is rounded off by the integration of the world’s leading battery solution from Kreisel Electric, with a nominal capacity of 54 kWh, which is exclusively used in the electric sports car. “Thanks to our patented technologies, unique thermal management and the laser-welding process of the battery packs, we are now able to offer the lightest battery with the highest energy density for the most diverse applications, whether mobile or stationary. This in turn results in unrivalled, fast charging times, long ranges and a long service life of our battery solutions,” says Johann Kreisel, the third CEO in the Kreisel Electric group, completing the overall picture.

About Kreisel Electric GmbH & Co KG

Kreisel Electric GmbH & Co KG, based in Rainbach, Austria, is a solution provider offering comprehensive system solutions for all areas of e-mobility and stationary applications. The company was founded in 2014 by the three brothers Johann, Markus and Philipp Kreisel and has been one of the pioneers of a new era of e-mobility and electrification in the world ever since.
Originally driven by the vision of integrating the electric drive into all areas of mobility, Kreisel Electric develops the world’s lightest and most efficient high-performance batteries. The company’s projects now range from passenger cars, buses and trucks to boats and airplanes as well as stationary storage solutions.

About Sala Drive GmbH

Sala Drive was founded in Grieskirchen, Austria, in 2016 as a merger between several entrepreneurs with more than 40 years’ experience in the automotive, series production and motorsport sectors. The focus is on the development of powertrains for electric mobility applications as well as conventional motors and lightweight components for series production purposes. In addition to the automated 2-speed transmission, Sala Drive is currently also working on a structural lightweight component for a future sports car by a leading European OEM.