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Development of a Ball Bearing Turbocharger
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Abstract
Nissan has added ball bearings to its “High-flow Ceramic Turbocharger”(1) (introduced in 1987) to improve acceleration response by reducing friction loss. The following programs were carried out in applying ball bearings to the turbocharger: Optimum bearing size and material were selected to assure long life; lubrication techniques were employed to achieve compatibility between acceleration response and durability; a thrust support system was designed to assure that the ball bearings endure thrust load which varies in direction and magnitude during engine operation; and the squeeze film damper was optimized to keep the turbocharger silent.
These innovations have resulted in a practical ball-bearing turbocharger, which has been installed in Nissan's most recent Skyline model(released in May 1989). This is the first time a ball-bearing turbocharger has been applied to a passenger car.
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Aida, M., Umaoka, T., Mitsui, T., and Ushijima, Y., "Development of a Ball Bearing Turbocharger," SAE Technical Paper 900125, 1990, https://doi.org/10.4271/900125.Also In
References
- Matsuo I. Nishiguchi F. “The Development of Second Generation Ceramic Turbocharger” SAE Paper 880703
- Hirabayashi Y. et al. “Development of Nissan Variable Geometry JET Turbocharger” SAE Paper 860105
- Yamamoto S. “Dampers of Shaft Systems Supported by High Speed-Rolling Bearings” Journal of Japan Society of Lubrication Engineers 21 1976 10 666 672