New Heat-treatment Procedure for Wear Resistant Overrunning Alternator Decoupler Pulley

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The dynamic optimization of timing systems advanced by Litens Automotive allow the combustion engines toachieve long durability and improved fuel efficiency. The belt tensioner consist of a pulley bore surface slidingagainst the clutch wire. The material selection requirements for the pulley are stringent. First the steel must beeasy to machine but at the same time it must be wear resistant.Currently a nitriding treatment is applied to ASTM 1045 grade steel used in manufacturing of the pulley. Thisproposal seeks to find a heat treatment procedure that will substitute the nitriding process and hence will allowLitens to manufacture components in a faster way and more cost effectively. This is important to increase thisCanadian company's international competitiveness. The project will consist of new heat treatment procedureswith varying degrees of difficulty and evaluate the wear resistance under dry sliding conditions and by usingsolid lubricants. The results will contribute to development of a specific component but are also important tounderstand the tribological performance of heat treated low carbon steels.