自動変速機用歯車列計算の簡略化について

抄録

In order to simplify the calculation of automatic transmission planetary gear trains, it is useful to classify both the various combinations of the rotational members in the gear train and the overlapping gear ratios. It was found when applying this method to two sets of planetary gears t, hat 3rd gear becomes the direct drive. Whereas it is possible to build a 5-speed transmission with two planetary gears, this calculation method shows that only 4-speeds are practical. Therefore, three planetary gears should be used is constructing a 5-speed transmission.