• 대한기계학회논문집A
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• 제33권11호
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• pp.1217-1224
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• 2009

This paper presents a finite element (FE) analysis of the torsional rigidity of a two-stage cycloid drive. The cycloid disk makes contact with a number of pin-rollers simultaneously and eccentric shafts transmit not only torque of the spur gear stage to the cycloid disk, but also that of the cycloid disk to the output disk. Contacts between the disk and pin-rollers are simplified as linear spring elements, and the bearing of eccentric shaft is modeled as a rigid ring that has frictional contact to the disk and an elastic support. FE analysis for an ideal solid cycloid drive was performed and verified by a theoretical calculation. Accurate contact forces were then estimated by iterating between FE analysis for contact forces and Hertz theory calculations for nonlinear contact stiffness. In addition, torsional rigidity of the cycloid drive is analyzed to show that the bearing and nonlinear Hertz contact theory should be considered in analysis and design of a cycloid drive, which was verified with experiments. Finally, the effects of contact stiffness, bearing stiffness and cycloid disk structural stiffness according to the cycloid disk rotation on the torsional rigidity were investigated.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.219.1-219.1
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• 2005

• 대한기계학회논문집A
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• 제21권7호
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• pp.1166-1173
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• 1997

Due to progress in manufacturing techniques, the performance of the harmonic drive has been improved but not sufficiently. One of the important problems which the current harmonic drive has is that while there is the potential for having a wider tooth contact area, the total number of teeth engaged simultaneously is still small. This is mainly due to the involute tooth profile. Hence, in this study, the cycloid-type tooth profile is developed to improve this problem. This paper represents the design methodology and performance evaluation f the cycloid-type harmonic drive. Cycloide tooth profile was derived by analyzing geometry of the tooth engagement and the contact mechanisms of the tooth which were examined and analyzed by load analysis. The stress due to elastic deformation of a flexspline was also obtained by approximate formula and computer analysis. Finally, the cycloid-type harmonic drive with 1:100 speed ratio was manufactured and the performance of the harmonic drive was evaluated.

• 한국지능시스템학회논문지
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• 제17권1호
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• pp.19-25
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• 2007

로봇 시스템에서 사용되는 정밀 감속기 중에 사이클로이드 감속기는 높은 성능을 갖추고 있다. 이러한 사이클로이드 감속기를 설계하는 경우에는 많은 요소들을 고려해야 한다. 우선 기본 개념을 바탕으로 치형의 기하학적 분석이 그려져야만 한다. 그리고 기어의 이에 걸리는 하중과 스트레스, 수정계수를 정확히 계산하여야 한다. 마지막으로는 사이클로이드 치의 설계에 활용하기 위한 컴퓨터 소프트웨어는 기하학과 힙의 방정식을 기초로 발전할 필요가 있다. 이 논문에서 사이클로이드 감속기 설계 전문가 시스템은 비주얼C++를 사용하여 개발되어 진다. 그러므로 가장 중요한 요소는 사용자가 간단한 입력값을 넣음으로써 자동으로 구할 수 있다는 것이다.