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SKF delivers a new bearing solution for environmental micro-hybrid cars. This new magnetic sensor bearing solution is part of Valeo's StARS (Starter Alternator Reversible System) micro-hybrid system that provides automakers with possibilities to significantly reduce fuel consumption and CO2 emission in city driving, without any radical changes in the engine architecture.
This system featuring a Stop-Start function cuts off the engine when the vehicle stops at a red light or slows down in congested traffic situations, and restarts it quickly and silently when the driver releases the brake or engages a gear. It enables a reduction in fuel consumption and CO2 emissions of up to 25% in very dense urban traffic, typically during rush hour when there are many start and stops. The StARS solution combines the alternator and starter functions.
The magnetic sensor bearing provides a powerful, accurate, repeatable and durable magnetic field, able to function under severe running conditions including high temperature and speed. The magnetic field makes it possible to receive data of the speed and positioning of the shaft, making the reversibility of the electric machine possible.
"This new bearing solution is a successful step in our strategy to be a partner to the automotive industry in delivering energy efficient vehicles. The Valeo StARS system is a good example how new technology and joint development can achieve significant CO2 emission reduction", says Tryggve Sthen, President of the SKF Automotive Division.
The stop-start system StARS equips Citroen C2 and C3 StopStart models, the Smart Micro Hybrid Drive model and the Mercedes-Benz Class A and B Blue Efficiency models.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 22272R KOYO | 360 | 650 | 170 |
| 24172RHA KOYO | 360 | 600 | 243 |