APPLIED TECHNOLOGY BEARINGS
bearings were chosen for the axles. These can facilitate high speed rotation while generating very little heat. The principal benefit for the user is extended service life, which is vital for long distance, high speed rail travel. Ceramic-coated
insulated bearings were selected for the main traction motors. The proven safety record and lightness of these bearings will boost reliability and help prevent electrical pitting on the rolling surface, which is a known threat to bearing life, the company explains. For the drive units, which are subjected to
BEARING IN MIND THE DEMANDS OF ULTRA-HIGH SPEED TRAINS
Safety and reliability are paramount considerations on all rail projects, but in particular on ultra-high speed trains where speeds of around 200mph are typical. For such applications, the performance of the components selected is essential. To meet such demands, high performance axle,
motor and drive unit bearings from NSK have been specified for the H5 rolling stock to be deployed on the Hokkaido Shinkansen high speed rail line being constructed in Japan between Shin-Aomori and Sapporo. The initial section of the rail line is due to open in March 2016. NSK’s oil bath, double-row cylindrical roller
considerable vibration, the bearings chosen feature high strength cages that have been subjected to a nitriding treatment to enhance shock resistance. NSK is the sole bearing manufacturer to
have supplied bearings to all variants of Japan’s Shinkansen rolling stock since the initial ‘0 Series’ was launched in 1964. A half-century track record of performance, reliability, comfort and safety, even in the severe cold and snow of Japanese winters, proved to be highly attractive to Hokkaido.
NSK UK T: 01636 605123
www.nskeurope.com
CAR BODYWASHER BENEFITS FROM SPLIT ROLLER BEARINGS
At one Spanish car manufacturer, around 400,000 vehicles roll off the production line every year. But, before each car is painted, the bodyworks are cleaned in a washer. The bodyworks washer featured solid spherical roller bearings,
however the service life of these was reduced by the harsh operating conditions. Each time a damaged bearing in the conveyor belt drive needed replacing, production had to be stopped for at least four to five hours while the bearings were dismounted and replaced. To reduce these unplanned shutdowns, the customer asked Schaeffler to simplify the replacement of the bearings.
The special design of Schaeffler’s split spherical roller bearings and matching housings means that these are easier to mount. The use of split spherical roller bearings reduces the time it takes to replace bearings, particularly in areas that are difficult to access such as shafts with multiple supports. In a split bearing, the inner ring, outer ring and roller-and-cage assembly are split into two halves that are clamped together using screws. A cylindrical bore provides direct mounting onto the shaft, which means the bearings typically offer high thrust loads and dynamically compensate for any misalignment. Also, by using a split version of the bearing, many stages of the mounting and dismounting process are omitted. This means that downtimes – and any associated costs – are reduced significantly. Following a successful product presentation, the company asked
6 DEC/JAN 2016 | DESIGN SOLUTIONS
Schaeffler to replace the bearings and housings in the bodywork washer conveyor belt drive. Here, the conventional bearings were replaced with special plummer block housings fitted with lip type seals and split spherical roller bearings. In addition, FRM140/12.5 bearing rings from Schaeffler were installed at the locating end, which meant that it was only necessary to modify the washer machine bed in order to adjust the shaft axis to the correct reference height. Replacing the bearings now takes just 30 minutes compared to four or five hours previously. Depending on the car model, production losses resulting from a four to five hour bearing replacement can be as much as 500 bodyworks. By replacing these bearings with split spherical roller bearings, production losses are reduced to 180 bodyworks. Of addition benefit, Schaeffler’s split spherical roller bearings are also easy to stock due to their modular design - the same housing size is suitable for different shaft sizes. Outside of this
application, the split spherical roller bearings can be used in belt drives, paper machines, mixing and stirring plant, conveying equipment, roll mills, converters,
crushers, rotary kilns, fans, ventilators, drive and transmission shafts, plus many more.
Schaeffler T: 0121 313 5870
www.schaeffler.co.uk
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