Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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A Study on Efficiency of Tapered Roller Bearing for an Automatic Transmission

승용차 자동변속기용 테이퍼 롤러 베어링의 효율개선 연구

  • Lee, In-Wook (Schaeffler Korea Corporation) ;
  • Han, Sung Gil (Department of Mechanical and Aerospace engineering, Graduate School, Gyeongsang National University) ;
  • Shin, Yoo In (Industry-academy Convergence District Development Agency, GNU) ;
  • Song, Chul Ki (Department of Mechanical Engineering, Engineering Research Institute, GNU)
  • 이인욱 ((유)셰플러코리아) ;
  • 한성길 (경상대학교 대학원 기계항공공학부) ;
  • 신유인 (경상대학교 산학융합지구 조성사업단) ;
  • 송철기 (경상대학교 기계공학부, 공학연구원)
  • Received : 2018.05.23
  • Accepted : 2018.09.06
  • Published : 2018.10.31
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Abstract

Automotive fuel efficiency regulations and air pollution control are hot issues of recent years in the automotive industry. To solve these regulation problems, many studies are continuing to improve the transmission efficiency of transmissions. Tapered roller bearings are useful to improve the transmission efficiency in the recent automobile parts. The frictional losses in the tapered roller bearings are mainly composed of the rolling friction and the sliding friction, and are dependent upon the load, the lubrication, the rotation speed of bearings, and etc. In this paper, the operating conditions of the transmission are defined and then the power losses of each bearing are calculated. In addition, improvement options are suggested after identifying the design factors influenced much by the improvement effect of power loss under the operating conditions of each bearing. We compare the power losses of the entire transmission system due to bearing improvements by comparing the friction losses between the original design and the improved design. Lastly, it is shown that the calculated power losses are valid by comparing the test values and the theoretical values for the frictional torque characteristics of the original and improved bearings.

Keywords

References

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