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.

Abstract
 1. 서론
 2. 변속특성 및 롤러마모
  2.1 변속특성
  2.2 롤러마모
  2.3 볼 형태의 가동플랜지 제안
 3. 실험 장치
 4. 실험 결과
  4.1 벨트 피치직경과 변속비
  4.2. 전달토크
  4.3 롤러 및 볼 마모
 5. 결론
 참고문헌

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