Ker-Train Research Inc.

  Variator Transmission

  Incrementally Variable Transmission

  Coplanar Gear Loops

  Bidirectional Clutch

  Sales Information



Prototype (non-circular-gear) Variators have been built for agricultural and industrial applications, but were not found suitable for automotive use. The main flaws were a lack of engine braking and complex differential gearing. The Variator is now a viable automotive transmission concept because of developments by KTR. The gearing has been simplified thanks to our new proprietary gearing technology. Engine braking is now available throughout the full range of ratios.

  • Infinite variability (can be classified as an all-gear CVT)
  • Mechanical efficiency between 95% and 98%
  • No torque converter required since the Variator starts from 0
  • Weight and volume savings over current CVTs
  • Engine braking throughout the full ratio range
  • Improved fuel economy
  • Lower exhaust emissions