The paper is the result of a joint effort by Renold Ltd. and Saab Scania dealing with the development of a transfer drive system for a production Saab front wheel drive automobile. The drive consists of three simple roller chains staggered third of a tooth combined with automatic chain tensioning and adjustment. The design of the transfer drive is described - comparisons with gears - bearing arrangements - resulting economies etc. Development of the chain system is described together with details of automatic tensioning and load measurement. The Saab development program is dealt with including high-speed rig and road testing plus noise evaluation and assessment. The mass production aspect, quality control, and experience in service is also covered.

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