SKF Launches Asymmetrical Hub Bearing Unit

SKF has launched the X-Tracker asymmetrical hub bearing unit, which is said to resolve the long-standing issue of caliper piston knock-back on high-performance cars. This problem can occur when cornering at high speeds or when driving on rough ground. The solution is believed to deliver the highest contribution to total vehicle power loss reduction, cutting wheel bearing friction by 25 per cent compared with market benchmark ball bearing hub units.

Equally, this reduces CO2 emissions by 1.3g/km for medium cars, according to the SKF Vehicle Environmental Performance Simulator, based on the New European Driving Cycle. Based on a standard X-Tracker, the hub bearing unit consists of a double-row bearing arrangement in which the outboard row is at a higher diameter and contains more rolling elements than the inboard row. This asymmetrical design increases the load-carrying capacity and operational life of each bearing, while significantly improving stiffness compared with traditional symmetrical hub units.

The low-friction version has the same compact design as conventional units, with the dimensions and weight remaining unchanged compared with standard products. The device is suitable both for new car designs as well as being suitable for retrofitting. By combining the superior life and performance of the standard X-Tracker with newly optimised raceway geometry and friction-optimised seals, this latest unit is said to provide good stiffness and life-to-friction ratio. All versions of the X-Tracker wheel hub units contribute to improved driver performance, cornering and car stability across all types of vehicle, from family units to luxury performance cars.

Design variants are available to cover the complete light vehicle range. Cengiz R Shevket, director of engineering, business unit cars at SKF's automotive division, said: 'The low-friction X-Tracker's performance features fit perfectly to the current market need to reduce power loss and increase power density, while also making significant contributions to energy and CO2 savings.

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