Compact and energy efficient transmissions - control and prediction of functional surface behavior

Important results from the project

The aim has been to develop methods for selecting an optimal running-in for transmission components in heavy vehicles. This has been done by developing methods for simulation of given form, surface structure and analysis of sub-surface structure during running-in. The purpose is to allow more robust and better prediction of the efficiency and contact fatigue in gearboxes. The simulation model has been linked with experimental evaluation and characterization, and the potential for using the right surface texture and correctly run-in of gears in heavy vehicle have been shown.

Expected long term effects

The project has increased the knowledge of how a robust surface is created in manufacturing and how it is affected during the run-in, which means new possibilities for preparing the transmission surface for long service life and high efficiency. Through the doctoral research, the industry partners have increased their knowledge of how a robust surface is created during manufacture and it is affected during run-in. The basis has been set to prepare the transmission components for long service life and high efficiency, which strengthens the competitiveness of the industrial partners.

Approach and implementation

The work has been carried out together with KTH, Chalmers, Volvo and Scania. The project is divided into four milestones and regular project meetings have been held. Doctoral students have regularly visited the industrial parties for both shorter and longer times to carry out both testing and analysis. The development of simulation methods and characterization of surfaces and materials has been carried out by KTH and Chalmers, supported by the industrial partners. The work at KTH and Chalmers has been supplemented with tests, investigations and evaluations at Scania CV and Volvo.