A Design of an Automotive Wheel Bearing Unit for Long Life

자동차 휠 베어링 유닛의 장수명 설계

  • Published : 2000.02.01


This paper presents a new design method of the 1 generation wheel bearing unit using a numerical optimization technique in order to increase bearing fatigue life. For calculating the fatigue life, a method of load analysis is studied on the automotive wheel bearing system. The design variables selected are ball size, initial contact angle, number of balls, pitch diameter, pre-load, and distance between ball centers. The method of feasible directions in ADS (Automated Design Synthesis) is utilized to automatically find the optimum design variables. To validate the design method, a computer program is developed and applied to a practical passenger car model. The optimum design results demonstrated the effectiveness of the proposed design method showing that the system life of the optimally designed wheel bearing unit is enhanced in comparison with that of the initial ones within the given available design space.


Wheel Bering Unit;Fatigue Life;Double Row Angular Contact Ball Bearing;Cornering Acceleration;Optimum Design


  1. Harris, T. A., 1991, Rolling Bearing Analysis : 3rd ed., John Wiley and Sons, Inc
  2. 白谷隆明, 1996, '트랜스미션용 베어링의 장수명화 기술,' 월간 기계설계기술, 2월호, pp. 37-41
  3. Lundberg, G. and Palmgren, A., 1947, 'Dynamic Capacity of Rolling Bearings,' ACTA POLYTECHNICA, Mechanical Engineering Series I, Royal Swedish Academy of Engineering Science, No. 3, Vol. 7
  4. ISO, 1985, 'Explanatory note on ISO 281/1-1997,' Technical Report 8646
  5. Harris, T. A., 1996, 'How to Compute the Effects of Preloaded Bearings,' Product Engineering, July 19
  6. Rao, S. S., 1996, Enginering Optimization; Thoery and Practice, John Wiley & Sons, Inc., New York
  7. Vanderplaats, G. N., 1984, Numerical Optmization Techniques for Engineering Design ; with Applications, McGraw-Hill, New York
  8. Vanderplaats, G. N., 1985, 'ADS- A Fortran Program for Automated Design Synthesis version 1.10,' Engineering Design Optimization, Inc.
  9. Hofmann, H. and Troster, M., 1988, 'Progress with Car Wheel Bearing Units,' Ball and Roller Bearing Engineering .Industrial Engineering published by FAG, 27 No. 2, pp. 13-15
  10. Hofmann, H. and Bayer, O., 1990, 'ABS Wheel Bearing,' Ball and Roller Bearing Engineering .Industrial Engineering published by FAG, 501, pp. 19-24
  11. Ouchi, H., 1996, 'Hub Unit Bearing with Annular Passive Sensor,' NSK Technical Journal, No. 662, pp.1-7
  12. Kiener, H., Rolling Bearing for Car Hub WTS871221E, SKF
  13. Tussey, R. P. and Christiansen, P. J., 1981, 'Integral Ball Bearing Spindle for Automotive Wheel Applications,' SAE Technical Paper Series 810755
  14. Lorosch, H. K., 1996, '구름베어링의 적정치수 결정과 경제적 베어링 장치의 설계,' 월간 기계 설계기술, 2월호, pp. 63-70
  15. 한화기계(주) 부설 연구소, 1995, '승용차 종동륜용 휠 베어링 유니트 기술개발에 관한 연구,' 통산산업부 연구보고서
  16. Jones, A. B., 1960, 'A General Theory for Elastically Constrained Ball and Radial Roller Bearings Under Arbitrary Load and Speed Conditions,' Journal of Basic Engineering, Vol. 82, pp. 309-320