Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Design of Worm Gear for CVVL Paired with ZK Worm and Involute Helical Gear

ZK 웜과 인볼류트 헬리컬기어로 결합된 CVVL용 웜기어 설계

  • Sohn, Jonghyeon (Department of Mechanical Engineering, Pusan National University) ;
  • Park, Nogill (Department of Mechanical Engineering, Pusan National University) ;
  • Oh, Chunghan (Gasoline Engine Engineering Team, Hyundai-Motor Company)
  • 손종현 (부산대학교 기계공학부) ;
  • 박노길 (부산대학교 기계공학부) ;
  • 오정한 (현대자동차 가솔린엔진설계팀)
  • Received : 2013.04.01
  • Accepted : 2013.06.20
  • Published : 2014.01.01
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Abstract

The worm gear is used in the motor drive system of automotive CVVL because of its compactness and self-locking ability. A ZK worm and an involute helical gear can be meshed in order to reduce production cost. However, the gearing is not suitable for the reliability and the NVH problem. To improve the dynamic performances, an optimal design process is considered. The transmission error is calculated theoretically and minimized with the several gear design parameters. An inequality condition such as the teeth interference elimination is added.

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References

  1. K. P. Ha, D. Han and W. T. Kim, "Development of Continuously Variable Valve Lift Engine," KSAE2010-01-1187, 2010.
  2. F. L. Litvin, Gear Geometry and Applied Theory, pp.7-137, Cambridge University Press, Cambridge, 2004.
  3. AGMA, 6022-C93, Design Manual for Cylindrical Wormgearing, pp.5-8, 1993.
  4. W. P. Crosher, Design and Application of the Worm Gear, pp.39-61, ASME Press, New York, 2002.