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Continuously Variable Accessory Drive System
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English
Abstract
Many types of variable speed accessory drive systems have been researched and developed, but none have been adopted in a production car1,2. There has been an increasing demand on the accessory drive system due to the adoption of new accessories in passenger cars. Along with the increasing demand on the system, nothing can be done which would decrease fuel economy. So, the efficiency of the system must be improved. This has caused renewed interest in variable speed accessory drives.
A compact V-ribbed (serpentine) belt CVT system for accessory drive (called CVAD: Continuously Variable Accessory Drive System) has been developed3. By applying the CVAD for the accessory belt drive system, fuel savings, increased vehicle performance in acceleration, noise reduction, increased life of accessories and V-ribbed belts, and a reduction in the size of accessories are possible. The performance of a prototype variator, the principal component of the CVAD, has been evaluated. A high power transmission efficiency of over 87% was obtained with a speed ratio of 0.6, a torque capacity of 40 Nm, and a slack side belt tension less than 400N. Good controllability of the belt tension was also achieved.
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Citation
Yasuhara, S., Tamagawa, T., Hasuda, Y., and Johns, T., "Continuously Variable Accessory Drive System," SAE Technical Paper 970007, 1997, https://doi.org/10.4271/970007.Also In
References
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- Kawarai, M. et al 1993 Development of Continuously Variable Transmission for Auxiliary Components Proceedings, 1993 JSAE Autumn Convention Nagoya October 1993 934 61 68
- Tamagawa, T. Yasuhara, S. Hasuda, Y. Continuously Variable Accessory Drive System (CVAD) International Conference on Continuously Variable Power Transmissions September 1996 207
- Hedman, A. 1991 Variable Accessory Drives - the Potential for Improving Fuel Consumption and Acceleration Performance Proceedings, Third EAEC International Conference on Vehicle Dynamics and Power train Engineering Strasbourg June 1991 109 114
- Fritzson, D. 1983 Numerical Methods to Determine the Forces in Traction Drives Assuming Hertzian Pressure Distribution Division of Machine Elements, Chalmers University of Technology Goteborg, Sweden 1983
- Hedman, A. 1990 Loss analysis of the Front End Accessory Drive (F.E.A.D) Division of Machine Elements, Chalmers University of Technology S-412 Goteborg, Sweden