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Simpson planetary gearset : ウィキペディア英語版 | Simpson planetary gearset
The Simpson planetary gearset consists of two planetary gearsets, both having the same gears and gear ratios. It was employed in automatic transmissions. It was one of the several designs invented by American engineer Howard Simpson. A Simpson gearset delivers three forward gears and one reverse, plus neutral. Actually there are four forward gears, but two of them have exactly the same ratio, so there are three distinct gears. Third gear is always direct drive (1:1). ==Overview== The two identical planetaries are interdependent. Their suns are bonded - in practice, both gearsets share a longer sun gear. The planet support of the first gearset ("first" meaning closer to engine input shaft) is in synchronism with the second gearset's ring, and both are in synchronism with the output shaft. Due to these links, two bands and two clutches are all that is needed to command the gearsets and extract the different gears. A four-speed box can easily be developed from a Simpson box, just by adding a third gearset which is operated independently, to create the fourth, long gear (the Simpson part being in 1:1 gear).
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Simpson planetary gearset」の詳細全文を読む
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