| 摘要 |
PROBLEM TO BE SOLVED: To achieve improvement of durability of a transmission and miniaturization by reducing thrust force generated on a unit output shaft. SOLUTION: A transmission output gear 7 of a helical gear is provided on one end of a unit output shaft 6. The rotational direction of the unit output shaft 6, viewed from the transmission output gear 7 side is made into the counterclockwise direction in forward travel of a power circulation mode. The tooth traces of respective helical gears on the unit output shaft 6, viewed from the transmission output gear 7 side are set so that a sun gear 5a has a right helix, a ring gear 5c has a left helix, a constant transmission output gear 3b has a left helix, and a transmission output gear 7 has a left helix.
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