| LAMTRAK | This project is closed |
| Rough Surface EHD Traction Model |
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Context The Torotrak rolling traction variator is a continuously variable ratio transmission device for use in advanced vehicles to increase fuel efficiency and reduce pollution. Work is needed to improve the understanding of the operation of the traction roller contacts in the variator to improve efficiency and durability. Aims Create an advanced model of the contact region including the effects of lubrication and the roughness of the contacting surfaces. Investigate the generation of elastohydrodynamic lubrication films Generate fundamental understanding of issues concerning sealed-for-life durability, optimum roughness profiles and conditions leading to thermal runaway Method Carry out a full thermal, non-Newtonian elastohydrodynamic lubrication analysis Develop a validated rheological model applicable to the traction fluid/variator contact region and a mixed-lubrication model for the "dry contact" areas within the device Apply these models to the real variator contact and investigate the mixed film effects in these devices. Develop an optical method of measuring film thicknesses in sliding and rolling contact Study the effect of temperature, spin, slide roll ratio and entrainment speed on traction in thin film, high pressure, lubricated contacts using a range of traction fluids Benefits The results will assist Torotrak in meeting its target of 80% penetration of the worlds automatic transmission market. Improved understanding of the elastohydrodynamics of friction reduction in thin lubricating films Increased application of IVTs in vehicles leading to greater fuel efficiency and reduce pollution. Participants Torotrak Development Ltd Cardiff University Imperial College Imperial Consultants |
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