RENK homeRENK home
vacuum gearbox systems

etaX®− high-speed gearbox optimized for minimum power loss

etaX®− high-speed gearbox optimized for minimum power loss

The ever-increasing performance limits in the high-speed gear unit market have prompted ongoing further developments in RENK’s gear unit technology. Newly developed RENK technologies such as etaX®-Vacutech or etax®-ISOPress bearings, enable us to cut the loss of power by up to 40% today. At the same time, we are increasing the level of operating safety with a significantly reduced temperature level in the gear tooth area.

RENK has been continually delivering technology of this kind to energy companies around the world since the year 2000. The additional costs are typically compensated for within two to three years.

The sophisticated RENK etaX® technology is currently the latest, most economical and mature high-speed gear unit concept in the 30–200 MW range.

An integrated safety feature, etaX®-CONTROL, monitors and controls the operation in atmospheric or vacuum mode completely automatically. Unrestricted operation is possible in both modes without limitations.

The flexible basic concept behind the etaX® range enables the greatest possible flexibility and adaptability for retrofitting existing standard gear unit solutions with higher levels of power loss.


  1. Efficiency increases up to 0.4% in comparison with conventional gear units
  2. Reduced operating temperature by at least 15 K
  3. Reduced oil quantity
  4. Reduced oil wear permits longer oil change intervals
  5. Fully automatic operation
  6. Unrestricted availability in conventional operation as well
  7. Amortization typically between one and three years.
  8. Significant CO2 savings in the system’s overall footprint
  9. Noise-optimized design

Technical Data

Power:30 - 200 MW
Low speed shaft:< 10 000 rpm
High speed shaft:< 15 000 rpm
Ratio:1,2 - 9

You might also be interested in:

Planetary Gearboxes

Integral Gearboxes

Variable Speed Systems

High-Speed Gearboxes Team

Get in touch with our experts in case of any questions.

High-Speed Gearboxes Team
Phone number
+49 821 5700 0
[email protected]

High-Speed Gearboxes Team

Phone number
+49 821 5700 0