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    • 30. 发明授权
    • Multiple speed transmission
    • US10371235B2
    • 2019-08-06
    • US15629187
    • 2017-06-21
    • Ford Global Technologies, LLC
    • Gregory Daniel Goleski
    • F16H3/66
    • A family of transmission gearing arrangements produces nine forward and one reverse speed ratio by selective engagement of various combinations of three clutches or brakes. Each transmission gearing arrangement includes a front shiftable gearing arrangement configured to establish a variety of speed ratios between an intermediate shaft and an input shaft. These speed ratios include a reverse speed ratio, a zero speed ratio, two underdrive ratios, and a direct ratio. Each transmission also includes a rear shiftable gearing arrangement configured to selectively establish particular speed relationships. Engagement of a clutch in the rear shiftable gearing arrangement establishes an underdrive ratio between the output shaft and the intermediate shaft. Engagement of another clutch in the rear shiftable gearing arrangement constrains the speed of the input shaft to be a weighted average between the speed of the intermediate shaft and the output shaft.