Speed Ratio Control of Half-Toroidal Traction Drive CVT (2nd Report, Attitude Angle Control by a Nut and Screw Set)

Hirohisa Tanaka; Noriko Kawasaki; Hisashi Machida

doi:10.1299/kikaic.61.449

Speed Ratio Control of Half-Toroidal Traction Drive CVT (2nd Report, Attitude Angle Control by a Nut and Screw Set)

Hirohisa Tanaka, Noriko Kawasaki, Hisashi Machida

Research output: Contribution to journal › Article › peer-review

Abstract

Traction-drive continuously variable power transmission, CVT, changes its speed ratio through control of the side-slip force acting on the Hertzian ellipse. Usually it is controlled by a hydraulic servomechanism because of its easy control of equal torque transmission of rolling elements. Here a new type of mechanical servomechanism is proposed for reducing the auxiliary unit power waste. Side slip for the speed ratio change is controlled by a nut and screw set. The dynamic model of the servomechanism is reduced to a first order lag system. The time constant is inversely proportional to the screw lead and the disk rotational speed. The performance is tested by the CVT with input torque capacity of 38N∗m, input rotational speed of 4000 rpm and speed ratio range of 0.4 to 2.5.

Original language	English
Pages (from-to)	449-451
Number of pages	3
Journal	Transactions of the Japan Society of Mechanical Engineers Series C
Volume	61
Issue number	582
DOIs	https://doi.org/10.1299/kikaic.61.449
Publication status	Published - 1995

Keywords

Continuously Variable Transmission
Machine Element
Mechanical Speed Ratio Control
Nut and Screw Servomechanism
Traction Drive

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

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10.1299/kikaic.61.449

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title = "Speed Ratio Control of Half-Toroidal Traction Drive CVT (2nd Report, Attitude Angle Control by a Nut and Screw Set)",

abstract = "Traction-drive continuously variable power transmission, CVT, changes its speed ratio through control of the side-slip force acting on the Hertzian ellipse. Usually it is controlled by a hydraulic servomechanism because of its easy control of equal torque transmission of rolling elements. Here a new type of mechanical servomechanism is proposed for reducing the auxiliary unit power waste. Side slip for the speed ratio change is controlled by a nut and screw set. The dynamic model of the servomechanism is reduced to a first order lag system. The time constant is inversely proportional to the screw lead and the disk rotational speed. The performance is tested by the CVT with input torque capacity of 38N∗m, input rotational speed of 4000 rpm and speed ratio range of 0.4 to 2.5.",

keywords = "Continuously Variable Transmission, Machine Element, Mechanical Speed Ratio Control, Nut and Screw Servomechanism, Traction Drive",

author = "Hirohisa Tanaka and Noriko Kawasaki and Hisashi Machida",

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AU - Tanaka, Hirohisa

AU - Kawasaki, Noriko

AU - Machida, Hisashi

PY - 1995

Y1 - 1995

N2 - Traction-drive continuously variable power transmission, CVT, changes its speed ratio through control of the side-slip force acting on the Hertzian ellipse. Usually it is controlled by a hydraulic servomechanism because of its easy control of equal torque transmission of rolling elements. Here a new type of mechanical servomechanism is proposed for reducing the auxiliary unit power waste. Side slip for the speed ratio change is controlled by a nut and screw set. The dynamic model of the servomechanism is reduced to a first order lag system. The time constant is inversely proportional to the screw lead and the disk rotational speed. The performance is tested by the CVT with input torque capacity of 38N∗m, input rotational speed of 4000 rpm and speed ratio range of 0.4 to 2.5.

AB - Traction-drive continuously variable power transmission, CVT, changes its speed ratio through control of the side-slip force acting on the Hertzian ellipse. Usually it is controlled by a hydraulic servomechanism because of its easy control of equal torque transmission of rolling elements. Here a new type of mechanical servomechanism is proposed for reducing the auxiliary unit power waste. Side slip for the speed ratio change is controlled by a nut and screw set. The dynamic model of the servomechanism is reduced to a first order lag system. The time constant is inversely proportional to the screw lead and the disk rotational speed. The performance is tested by the CVT with input torque capacity of 38N∗m, input rotational speed of 4000 rpm and speed ratio range of 0.4 to 2.5.

KW - Continuously Variable Transmission

KW - Machine Element

KW - Mechanical Speed Ratio Control

KW - Nut and Screw Servomechanism

KW - Traction Drive

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Speed Ratio Control of Half-Toroidal Traction Drive CVT (2nd Report, Attitude Angle Control by a Nut and Screw Set)

Abstract

Keywords

ASJC Scopus subject areas

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