Miami Dade Country Metropolitan Transportation, Miami's public transport authority, has ordered 130 metro trains from AnsaldoBreda/Hitachi until with deliveries of the vehicles starting in 2018.
ZF supplies four innovative and weight-optimized rail drives for each of these Electric Multiple Units (EMUs). The gearbox were developed in Friedrichshafen and are now produced at ZF’s Gainesville, Georgia location to meet the United States government’s "Buy America" requirements.
Being a specialist in driveline and chassis technology for rail vehicles, ZF Friedrichshafen AG presents an advanced light rail gearbox offering lower weight (approx. 380 kg/840lbs) and optimized design, reducing noise emissions for quiet operation.
Every kilogram that is saved in the vehicle results in more vehicle payload resulting in more efficient passenger transport. Operators and manufacturers of light rail trains continuously search for suppliers that contribute to weight reductions without impacting operational reliability.
The two-stage gearbox that meets all these technical requirements has been developed in Friedrichshafen, Germany at ZF's Special Driveline Technology Business Unit. The gearbox uses a spheroidal cast iron housing which have a high value of tensile strength and elongation against fracture are achieved.
Another advantage of the ZF gearbox is the use of standard ZF labyrinth seals. Typically these contact-free labyrinth seals are longer lasting, but have to be developed and adapted for the corresponding application. Thanks to an established ZF standard for the use of these seals. The development time was significantly reduced.