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Design and Selection Factors for Automatic Transaxle Tapered Roller Bearings
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English
Abstract
Tapered roller bearings have proven successful in a number of high-volume automatic transaxle designs. Typically, tapered roller bearings are required to carry high loads generated by helical and hypoid gears. To meet the demands of a successful design, a number of factors must be considered in the selection and application of tapered roller bearings. This paper presents a discussion of these factors as well as results from Chrysler's transaxle testing.
Selection of tapered roller bearings is based on the transmission duty cycle developed using load and speed histograms, gear data, size constraints, and life requirements. A bearing life analysis considering the total transaxle system is conducted using a sophisticated computer program. Various system effects are analyzed including the load/speed cycle, housing and shaft rigidity, lubrication, bearing setting, thermal effects, and bearing internal design.
Dynamometer and durability testing of various model transaxles have assisted in predicting bearing performance in the actual application. Testing also provides data necessary for enhancements to bearing design, housing and shaft design for improved rigidity, and improved oil flow to the bearings.
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Authors
Citation
Martin, B. and Hill, H., "Design and Selection Factors for Automatic Transaxle Tapered Roller Bearings," SAE Technical Paper 920609, 1992, https://doi.org/10.4271/920609.Also In
Transmission and Driveline Symposium: Components, Gears, and Cae
Number: SP-0905; Published: 1992-02-01
Number: SP-0905; Published: 1992-02-01
References
- Hull, J. R. “Rolling Element Bearings in Passenger Car Automatic Transmissions” SAE Design Practices, Passenger Car Automatic Transmissions 5 SAE, Inc. 1973
- Bhatia, R. R. Springer T. E. “Using Histograms in the Selection Process for Tapered Roller Bearings” Paper 810993 , Proceedings of the SAE International Off-Highway Meeting and Exposition Milwaukee, WI September 14-17 1981
- Moyer, C. A. “Using the Modified Lambda Ratio to Advance Bearing and Gear Performance” Paper 901625 , Proceedings of the SAE International Off-Highway and Powerplant Congress and Exposition Milwaukee, WI September 10-13 1990
- Hoeprich, M. R. “Numerical Procedure for Designing Rolling Element Contact Geometry as a Function of Load Cycle Proceedings of the SAE Earthmoving Industry Conference Peoria, IL April 15-17 1985
- Dickerhoff, R. P. Hill H. E. Kreider G. E. “Thermal Compensating Tapered Roller Bearing for Enhancement of Transmission and Transaxle Performance” Paper 910799 , Proceedings of the SAE International Congress and Exposition Detroit, MI February 25 March 1 1991