• 제목/요약/키워드: 연속가변밸브리프트

검색결과 2건 처리시간 0.017초

2차 캠 중심 이동형 연속가변밸브 구동기구의 기구학 해석 (Kinematic Analysis of a Continuously Variable Valve Actuation Mechanism with Movable Second Cam Center)

  • 김도중;김용현
    • 한국자동차공학회논문집
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    • 제17권5호
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    • pp.7-15
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    • 2009
  • This paper introduces a new variable valve actuation mechanism with movable second cam center. Valve lift and open duration can be continuously varied according to engine speed and load conditions. A new method to analyze the kinematic relations between the first and second cam profiles and valve motion are also introduced. Because of rocker motion of the second cam, conventional motion conversion program could not be used in this problem. An example shows continuous variations of valve motion and adequate ramp incorporation throughout all valve lift modes. Valve acceleration profile at the high lift mode is similar to that of conventional valvetrains. Contact geometry analysis of the mechanism gives basic information on the load conditions between the components.

ZK 웜과 인볼류트 헬리컬기어로 결합된 CVVL용 웜기어 설계 (Design of Worm Gear for CVVL Paired with ZK Worm and Involute Helical Gear)

  • 손종현;박노길;오정한
    • 한국자동차공학회논문집
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    • 제22권1호
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    • pp.77-84
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    • 2014
  • 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.