TD-8 DEVELOPMENT OF HIGH POWER-DENSITY DOUBLE CAVITY HALF-TOROIDAL CVT(TRACTION DRIVES)

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概要

• 論文の詳細を見る

• Reducing CO_2 emissions, which cause global warming, is one of the most important challenges facing the automobile industry today. As a result, the demand for high-powered continuously variable transmissions (CVT) has been steadily increasing. The traction-drive type half-toroidal CVT meets this demand. In 1999, the first mass-produced model of a traction-drive CVT for large-size passenger vehicles entered the Japanese automobile market. In this mass production model, there were two power rollers per cavity. In contrast, a toroidal mechanism with three rollers per cavity has been studied to attain greater compactness and higher torque capacity. A three-roller system has one and half times the torque capacity of a conventional two-roller system. In a full-toroidal CVT, the three-roller system has been analyzed for some time now. Interest in the full-toroidal system lies in the fact that the amount of power at one traction contact point is restricted by excessive spin loss. The half-toroidal CVT, however, does not have as much spin loss at traction contact point. Therefore, a half-toroidal with three rollers shows great potential as a high power-density transmission. There are some issues regarding the three-roller system that need to be considered, however. One issue is the development of a ratio control mechanism. Hydraulic pistons, which are attached to each trunnion, control transmission ratio in a three-roller system, these hydraulic pistons impede the design of a compact CVT, which is a major requirement for automobile application. In this paper, we will present a new concept for a three-roller system, which is compact in size and has high torque capacity.

• 一般社団法人日本機械学会の論文
• 2001-11-15

著者

• Imanishi Takashi

  Corporate R&d Center Nsk Ltd.

• Tanaka Hirohisa

  Department Of Mechanical Engineering Yokohama National University

• MACHIDA Hisashi

  Corporate Research and Development Center, NSK Ltd.

• MACHIDA Hisashi

  Technology Development Division-Headquarters, NSK Ltd.

• Machida Hisashi

  Corporate R&d Center Nsk Ltd.

関連論文

• TD-02 LIQUID TO SOLID DRIVE OF A HALF-TOROIDAL CVT(TRACTION DRIVES)
• TD-5 STUDY OF THE CONTROL MECHANISM OF A HALF-TOROIDAL CVT DURING LOAD TRANSMISSION(TRACTION DRIVES)
• Development of a 6 Power-Roller Half-Toroidal CVT : Mechanism and Efficiency
• TD-8 DEVELOPMENT OF HIGH POWER-DENSITY DOUBLE CAVITY HALF-TOROIDAL CVT(TRACTION DRIVES)
• Power Transmission of Half-Toroidal Traction Drive Continuously Variable Transmission : Four-Wheel-Drive CVT Design and Its Performance
• TD-6 HIGH SPEED TRACTION DRIVE FOR AIRCRAFT APPLICATIONS(TRACTION DRIVES)
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