SKF Rotor Positioning Bearing for Stop-Start systems improves fuel economy and reduces CO2 emissions

  • Story
    Rotor Positioning Bearing
    Rotor Positioning Bearing

    2012 May 08, 10:06 CEST

    SKF announced that the SKF Rotor Positioning Bearing has qualified into the SKF BeyondZero Portfolio because it is an integral component of Stop-Start systems for micro-hybrid vehicles. In dense urban traffic, Stop-Start can reduce fuel consumption and CO2 emissions up to 15%. Based on an annual mileage of 14,500km, this solution saves 75kg CO2 per vehicle per year.

    “The automotive industry is continually looking for solutions to reduce CO2 output and improve vehicle fuel efficiency,” says Franco Ferro, Director SKF Automotive, Powertrain & Electrical and Two Wheelers. “In partnership with Valeo, SKF developed the SKF Rotor Positioning Bearing, which helps make Stop-Start possible.”

    Stop-Start turns off a vehicle’s engine when the vehicle stops at a red light or slows down in congested traffic situations, then restarts the engine quickly and silently when power is needed.

    The SKF Rotor Positioning Bearing consists of a high performance magnetic ring clamped to a high-speed, high-temperature bearing. Together they produce a powerful, accurate, repeatable and durable magnetic field. The strong magnetic impulses produced by the SKF Rotor Positioning Bearing provide the starter-alternator control system with the rotor’s exact angular position, and enable the system to stop and start the engine quickly and quietly.

    If all the cars in a city the size of Berlin were equipped with this technology, 127000 tonnes of CO2 emissions* would be avoided each year.

    *According to Eurostat, between 2007 – 2009 there were 1,747,790 cars in Berlin.  This number assumes that they all were equipped with Peugeot or Citroen eHDi motors.

    Gothenburg, 08 May 2012

    Aktiebolaget SKF

    For further information, please contact:
    PRESS: Nia Kihlström, Press Manager,
    tel: +46 31-337 28 97, mobile: +46 706 67 28 97, e-mail:

    TECHNICAL PRESS: Colin Roberts, SKF Group Communication, tel +31 30 6075608, mobile: +31 653 944 111, e-mail:

    SKF is a leading global supplier of bearings, seals, mechatronics, lubrication systems, and services which include technical support, maintenance and reliability services, engineering consulting and training. SKF is represented in more than 130 countries and has around 15,000 distributor locations worldwide. Annual sales in 2011 were SEK 66,216 million and the number of employees was 46,039.

  • Image

Download press kit

Press kit (192 KB)

SKF logo