Study of Half Toroidal Continuously Variable Transmission. (1st report, analysis of the contact force by means of loading cam)

Hisashi Machida, Nobuhide Kurachi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In traction drives, the contact force is one of the most important factors used to obtain traction force. A loading cam and preload springs are used in the Half Toroidal CVT (Continuously Variable Transmission) for automobiles. Their use is very practical and it is considered that enough contact force is obtained on the traction contact point. Actually, on the cam surface, there is a friction loss which makes the contact force lower. In this report, the analysis of the cam force is examined and measured actual cam forces under various conditions are shown. The friction loss on the cam surface causes skew of the cam rollers. The friction coefficient is about 0.016 approximately 0.019. The cam force is decreased by almost 20%.

Original languageEnglish
Pages (from-to)1282-1287
Number of pages6
JournalNippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume56
Issue number525
Publication statusPublished - 1990 May
Externally publishedYes

Fingerprint

Cams
Friction
Rollers (machine components)
Point contacts
Automobiles

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "In traction drives, the contact force is one of the most important factors used to obtain traction force. A loading cam and preload springs are used in the Half Toroidal CVT (Continuously Variable Transmission) for automobiles. Their use is very practical and it is considered that enough contact force is obtained on the traction contact point. Actually, on the cam surface, there is a friction loss which makes the contact force lower. In this report, the analysis of the cam force is examined and measured actual cam forces under various conditions are shown. The friction loss on the cam surface causes skew of the cam rollers. The friction coefficient is about 0.016 approximately 0.019. The cam force is decreased by almost 20{\%}.",
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AB - In traction drives, the contact force is one of the most important factors used to obtain traction force. A loading cam and preload springs are used in the Half Toroidal CVT (Continuously Variable Transmission) for automobiles. Their use is very practical and it is considered that enough contact force is obtained on the traction contact point. Actually, on the cam surface, there is a friction loss which makes the contact force lower. In this report, the analysis of the cam force is examined and measured actual cam forces under various conditions are shown. The friction loss on the cam surface causes skew of the cam rollers. The friction coefficient is about 0.016 approximately 0.019. The cam force is decreased by almost 20%.

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