Heidenheim. L520 rzU2 + KB 360 - this is the designation of the Voith Turbo Transmission that recently helped the Spanish high-speed train "Talgo" break the world speed record. During a test ride between Madrid and Barcelona the Talgo reached a record speed of 254 km/h. In future, Talgo passengers will reach their destination on this line in less than two and a half hours. There is a power car at either end of the train. Each of the power cars is equipped with a 1,500 kW diesel engine, a Voith Turbo Transmission, and a new type of quill shaft final drive units. The cooler group and the cardan shafts were supplied by Voith Turbo, too.
In each power car a 1,500 kW 12-cylinder diesel engine drives the Voith Turbo Transmission through a cardan shaft. The transmission produces a torque that is optimally matched to the driving conditions. This torque is passed on to the axle shafts via cardan shafts and final drive units. The transmission type L 520 rzU2 + KB 360 is a two-speed transmission with two hydrodynamic torque converters and a hydrodynamic retarder. It is fully automatic and has been specially designed for high-performance mainline locomotives and railcars. The retarder permits wear-free braking also at high speeds.
Waste heat from engine and transmission is dissipated through the Voith cooler group. A fan sucks in cooling air from the sides of the vehicle through the radiators and blows it out through the top. In order to reduce noise emission as much as possible, the fan was designed in such a way that it rotates at half speed during full-load operation.
The power cars were designed by Spanish rail vehicle manufacturer Pat-entes Talgo S. A. and Siemens and are of light-weight construction. Complete with engine and transmission their total weight is only about 43 t.
Gauge-changing wheelsets were used here for the first time on a diesel power car, enabling not only passenger coaches but complete trainsets to be run across changeover points and operate them on both Spanish broadgauge track and standard-gauge high-speed lines. This has been made possible by special Voith quill shaft final drive units in conjunction with gaugechanging technology from Talgo. Torque is transmitted in these final drive units through gear couplings that permit axial displacement of the axle shaft ends.
The Talgo has been tested since 1999. A high number of sensors and measuring instruments was installed in the cars of the test train. A measuring car records the performance of locomotive and drive, among other things.
Passive body-tilt permits the use of the Talgo also on winding lines without speed reduction or loss of comfort for passengers. It is planned to run the train at an average speed of 180 km/h on the 650 km high-speed line from Madrid to Sevilla.
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