Semi-continuous transmission

Machine element or mechanism – Gearing – Interchangeably locked

Patent

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Details

74342, 74458, F16H 322

Patent

active

054904331

ABSTRACT:
A transmission subunit with an intermediate shaft having continuous gears of progressive pitch diameters interposed between pairs of conventional gears. The geometry of the continuous gears permits input gears, output gears, and/or idler gears to freely and independently slide longitudinally the length of the intermediate shaft without disengaging. Helical or spur cut gears can be used throughout. During shifting, an idler quickly passes from a conventional gear to an intermediate, continuous gear where it changes speed ratio progressively until the new ratio is achieved. At this point the idler quickly moves on to the next conventional gear to complete the shift cycle. An automatic locking mechanism assures precise, fixed alignment. As an example, a semi-continuous subunit consisting of two idler gears and three or four conventional running gears bridged with two or three continuous gears combined with a planetary gearset provides 14 to 22 forward speeds and 7 to 11 reverse speeds. Such transmissions have the capacity for a very broad ratio range, and can mimic the ideal performance standards of a continuously variable transmission. It is intended that this transmission take advantage of microprocessor output control capabilities which are currently under-utilized. This new architecture is simple, rugged, versatile, very efficient, and suitable for both manual and automatic transmissions.

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