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류정현(Jeonghyeon Ryu),성상훈(Sanghun Soong),박노길(Nogil Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
A continuously variable transmission (CVT) of a new type of traction drive consisting of a four-bar linkage and rotor with spherical surface is introduced. The fiction of this traction drive acts on the point where the interior surface of sphere contacts with the exterior one. The four-bar linkage is designed to give precise movement of the counter rotors and to extend the speed ratio range, which causes to improve the transmission performances when this model is applied to a split-power transmission system. The relationship between crank angle and follower angle is theoretically investigated and discussed on the desirable design considerations. For two cases of an offset-shafted transmission and a coaxial-shafted one, the variator speed ratio is also simulated with respect to the crank angle shows that all of negative, positive, zero, and infinite values can be included within the desirable crank angle range. The maximum contact stresses based on Hertz theory are compared with other traction drives. A simplified analysis shows that the proposed model have a significant advantage to increase the power density. Finally, the combining effect of the proposed model with an epicyclic gear train and the changing trend on variator speed ratio within the considered crank angle range showing enough possibility to apply to the infinite variable transmission (IVT) is discussed.
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