THE RAIL INDUSTRY SPECIAL FOCUS
bearings, called INSOCOAT, which use an electrically insulated coated inner or outer ring. The coating consists of an aluminium oxide layer between 100µm and 300µm thick depending on the application, applied using plasma- spraying technology. For modern high frequency inverter system applications, a further improvement in electrical insulation properties can be achieved using hybrid bearings, equipped with rolling elements made from an insulating material, typically bearing grade silicon nitride.
MEETING DEMANDS It isn’t just the detailed design of bearings that matters in rail applications. System designers must also balance reliability and ease of maintenance against tight space constraints. One increasingly popular solution
that helps achieve all three goals is the Traction Motor Bearing Unit, or TMBU. This is a compact, sealed and prelubricated bearing unit designed for flange mounting on the motor housing. A special grease is selected to achieve extended lubricant life, even at high operating temperatures. The bearing unit is equipped with non-contact labyrinth seals, frictionless and without wear. TMBUs are also available with integrated sensors that provide data on the absolute position, speed and direction of rotation of the motor. This information is used by the train’s control system to optimise motor and brake performance. Sensorised TMBUs can also measure the temperature of the bearing within the unit, part of another key trend in rail engineering: the increased use of
“It isn’t just the detailed design of bearings that matters in rail
applications. System designers must also balance reliability and ease of maintenance against tight space restrictions”
automated condition monitoring systems to provide operators with rich data on the performance of train components, and to provide early indication of potential problems. The latest SKF Multilog On-line System
IMx-B, for example, collects vibration, temperature and speed data wirelessly from sensors powered by the motion of the components they monitor. Intelligent capabilities built into the system recognise stable running conditions as the time to collect data and calculated values can be processed
locally on the train for immediate feedback or sent wirelessly to the cloud for further remote analysis. This enables the maintenance department to swiftly evaluate the condition of motors, gearboxes, axleboxes and wheels. Wireless communication dramatically
simplifies system installation, making it easier for operators to retrofit advanced condition monitoring technology onto existing rolling stock.
SKF
www.skf.co.uk
The latest SKF Multilog On-line System IMx-B collects vibration, temperature and
speed data wirelessly from sensors powered by the motion of the components they monitor
IT INFRASTRUCTURE
SOFTWARE & SERVICES
www.rittal.co.uk
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