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SABR Case Study


  • Clean sheet design of a 600Nm, 4 speed, 4WD, power-shift tractor transmission, prototype manufacture and development


  • Break down of application requirement in terms of duty cycles and transmission systems i.e. 4WD, PTO, main transmission etc.
  • 24 speed, 72 load-case transmission models created for different sub-systems
  • Full optimisation of shaft geometry from initial concept sizing and positioning to detailed modelling
  • Bearing lives assessed throughout the design process and specifications modified as required to ensure durability requirements achieved
  • Gear design for optimal and balanced lives accounting for gear misalignment and customer’s local manufacturing capabilities


  • Successful delivery of six prototype transmissions with achieved shaft, gear and bearing life in excess of the defined duty cycle requirements



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