変速比無限大無段自動変速機

Automatic continuously variable transmission with infinite change gear ratio

Abstract

PROBLEM TO BE SOLVED: To prevent the select time lag from being longer, eliminate fluctuation in the select time lag to improve the operability. SOLUTION: In a vehicular automatic continuously variable transmission, in which planetary gears are combined with a continuously variable transmission unit, and the transmission gear ratio can be continuously controlled from forward gear to backward gear, including an infinite transmission gear ratio, when the transmission gear ratio of the transmission unit during the time of neutral range is a first specified value, the transmission gear ratio of the transmission unit at the time of forward starting is a finite second specified value, and the transmission gear ratio of the transmission unit at the time of backward gear is a finite third specified value, the first specified value is regarded as an about central value between the second specified value and the third specified value, a starting element 24 permitting slipping rotation is provided, and a control means 30 for controlling the starting element 24 so that transmission output is kept to be stopped in relation to transmission input when the range is switched to forward gear range or backward gear range. COPYRIGHT: (C)1998,JPO
(57)【要約】 【課題】 セレクトタイムラグが長くなったり、バラツ クのを無くし、操作性を良くする。 【解決手段】 無段変速ユニット2に遊星歯車を3組み 合わせて前進から後進まで変速比を無限大変速比を含ん で連続的に制御可能な変速ユニットを有する車両の無段 自動変速機において、ニュートラルレンジ時の変速ユニ ットの変速比を第1の所定値、前進発進時の変速ユニッ トの変速比を有限の第2の所定値、後進時の変速ユニッ トの変速比を有限の第3の所定値とした場合、第1の所 定値を第2の所定値と第3の所定値のほぼ中央値とする と共に、滑り回転を許容する発進要素24を設け、前進 レンジまたは後進レンジに切換えたときに、変速機入力 に対して、変速機出力が停止している状態を保つように 発進要素24を制御する制御手段30を設ける。

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Cited By (4)

    Publication numberPublication dateAssigneeTitle
    JP-2008105622-AMay 08, 2008Toyota Central R&D Labs Inc, 株式会社豊田中央研究所ハイブリッド車両の駆動装置
    JP-WO2014080863-A1January 05, 2017本田技研工業株式会社無段変速機
    US-7108631-B2September 19, 2006Nsk Ltd.Continuously variable transmission
    WO-2014080863-A1May 30, 2014本田技研工業株式会社Stepless transmission