Today, conventional CVT equipped vehicle controls engine torque and gear ratio by using engine torque map and shifting map. But this control process is difficult to optimize the fuel economy when the driving mode is changed arbitrary. In this study, I propose the real-time CVT control with considering the power loss of transmission system to improve vehicle fuel economy and drivability. The driving performance and fuel economy of the proposed control logic is analyzed by backward simulation and the validity of new control logic is verified.

In this study, new Continuously Variable Transmission(CVT) system which is adaptable to a small size electric vehicle is proposed available to gradient response CVT. New pulleys consist of springs adapted driving pulley and driven pulley. At the moment a small electric vehicle drive a slope, new system respond to a gradient as overcoming tensional force of springs. We made prototype of gradient response CVT to test parts performance. As a result of test, belt pitch diameter varied for high torque direction at the gradient.

Dry CVT(Continuously variable transmission) consists of a driving pulley and a driven pulley joined by rubber V-belt. Each pulley consists of a fixed flange and a movable flange. The movable flange of the driving pulley has the centrifugal roller and a ramp plate in the flange. The movable flange moves toward a fixed flange under the actuation of a centrifugal roller, as the driving pulley speed increases. The main advantages of the Dry CVT with V-belt, which has been popular in Asia, are a simple mechanism, less maintenance and low cost. The important claim which have an influence on the performance of the Dry CVT is the wear of the centrifugal roller. In this study ball type is proposed instead of roller type of movable flange to resolve claim. Also experiments are carried out for new model to evaluate performances.

Dry CVT(Continuously variable transmission) consists of a driving pulley and a driven pulley joined by rubber V-belt. Each pulley consists of a fixed flange and a movable flange. The movable flange of the driving pulley has the centrifugal roller and a ramp plate in the flange. The movable flange moves toward a fixed flange under the actuation of a centrifugal roller, as the driving pulley speed increases. The main advantages of the Dry CVT with V-belt, which has been popular in Asia, are a simple mechanism, less maintenance and low cost. The important claim which have an influence on the performance of the Dry CVT is the wear of the centrifugal roller. In this study proposed an improved design of driving pulley reducing the wear of the centrifugal roller in order to provide some design guidelines.

World Widely, a lot of gearboxes are being developed for the increase of fuel efficiency. Among them, CVT has an infinite gear and shifts gear at the best situation which makes it have no impact by changing speed and reduce the expense of fuel. We designed and manufactured 2ranked gearbox for V-belt similar to CVT. We studied an energy generated when it is functioning and had an experiment of forwarding power of it. These studies are planned to find out its functions and the efficiency of forwarding power of it.

Dry CVT(Continuously variable transmission) consists of a driving pulley and a driven pulley joined by rubber V-belt. Each pulley consists of a fixed flange and a movable flange. The movable flange of the driving pulley has the centrifugal roller and a ramp plate in the flange. The movable flange moves toward a fixed flange under the actuation of a centrifugal roller, as the driving pulley speed increases. The main advantages of the Dry CVT with V-belt, which has been popular in Asia, are a simple mechanism, less maintenance and low cost. The important claim which has an influence on the performance of the Dry CVT is the wear of the centrifugal roller. In this study proposed an improved design of ramp plate reducing the wear of the centrifugal roller in order to provide some design guidelines.

Dry CVT(Continuously variable transmission) consists of a driving pulley and a driven pulley joined by rubber V-belt. Each pulley consists of a fixed flange and a movable flange. The movable flange of the driving pulley has centrifugal rollers and a ramp plate in it. The movable flange moves toward a fixed flange under the actuation of a centrifugal roller, as the driving pulley speed increases. In this study, computer simulation for a driving pulley was carried out for the purpose of analysis a Dry CVT. Based on the simulation we investigated relations between each omponent of driving pulley that consists of roller, movable flange and ramp plate

スクーターCVT(無段變速機)はゴムVベルトで繋がれた駆動プーリーと従動プーリーとで構成されている。また、それぞれのプーリーは固定フランジと稼動フランジで構成されている。 駆動プーリーの稼動フランジはフランジの中の遠心ローラーとランププレートがあり、駆動プーリーの速度が増加することによって遠心ローラーの動きで稼動フランジは固定フランジ方向に動いて変速が成り立つ。 アジア全域に広がっているゴムVベルトCVTは簡単な構造で成り立っていて維持補修が易しくて低価という長所を持っている。 この研究ではスクーターCVTの駆動プーリーと従動プーリーの 軸力解釈を理論的に遂行し、現場で使用可能になるように修飾化した。

Dry CVT(Continuously variable transmission) consists of a driving pulley and a driven pulley joined by rubber V-belt. Each pulley consists of a fixed flange and a movable flange. The movable flange of the driving pulley has the centrifugal roller and a ramp plate in the flange. In this study, the formula with respect to relationship between a driving pulley and a driven pulley was derived, based on theoretical investigation about Dry CVT of a common and practical auto-bicycle(125cc). Also, the axial forces on the driving pulley and the driven pulley were analyzed.

The Dry Continuously Variable Transmission (CVT) consists of a driving pulley and a driven pulley joined by a rubber V-belt. An each pulley consists of a fixed flange and a movable flange. The movable flange of the driving pulley has the centrifugal roller and a ramp plate in the flange. The movable flange moves toward a fixed flange under the actuation of a centrifugal roller, as the driving pulley speed increases. In this study, the function and the relationship of the all parts in the Dry CVT are investigated. The profile of movable flange is analyzed. The effect of axial force is also analyzed by speed ratio and load torque.

The scooter CVT is consisted of driving pulley, rubber V-belt and driven pulley. A driving pulley of CVT plays a vital role. In this study, contact forces of movable flange, roller and ramp plate are analyzed for wear of roller. As the results, 1) when incline angle of ramp plate become decreased, reaction difference of ramp plate and movable flange become increased, so roller wear can be decreased, 2) when radius of movable flange profile is increased, reaction difference become increased also. Roller wear had been caused serious claim. Based on the analysis, advanced model of driving pulley is presented.