Automakers have to reduce CO2 emissions from their internal combustion engines by around one-third in the next few years. Automotive hybridization is therefore an important issue – for us, too. New technologies such as the 48V Eco Drive system have been designed to deliver cost-efficient large-scale hybridization. Our specially developed UNIPOWER XHP high-performance multi V-belt provides the drive for the 48V belt alternator starter and the ancillary components.


  • Our special belt delivers high performance, while being reliable and tough.
  • It offers flexible configuration options and excellent noise properties.
  • It features outstanding grip in both the dry and the wet thanks to its special textile coating.

Technical data

  • Energy recovery of up to 20 kW via the belt drive
  • Lifetime of more than 240,000 km
  • Operating temperature range from -40°C to +140°C

Market trailblazer

Our development of the system, comprising the 48V belt alternator starter and the high-performance multi V-belt, means we are one of the first suppliers of mild-hybrid applications in the market. “The new 48V belt alternator starters have a significantly higher power consumption than the 12V alternators. We therefore had to reinforce the multi V-belt with an aramid tension member, a fiber-loaded EPDM compound and a special textured fabric surface,” declares product manager Manfred Bonkowski. The UNIPOWER XHP is optimized for 48V hybrid systems enabling up to 20% lower fuel consumption and provides reliable power transmission.

Equal to future challenges

Power transmission belts will continue to face rising requirements – with particular reference to belt-driven mild-hybrid applications, they have to transmit ever higher torques, last for the car’s lifetime and contribute to environmental protection. “The belts have not yet reached the limits of their operational capability,” declares Bonkowski with conviction. “We have already developed numerous power transmission belts that have met the growing requirements and are also already working on new solutions.


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