| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deterioration of the engagement of a reverse gear row arranged outside a bearing while preventing the deflection of a shaft accompanied by a low speed of a forward stage gear row by shortening a support span of a forward gear row without adding a bearing.SOLUTION: The fall-in of a reverse idle gear 36 to a reverse shaft 7 is suppressed by elongating an axial dimension of a boss pivot face of the reverse idle gear 36 which is supported on the reverse shaft 7 at both ends longer than a prior art, and the fall-down of the reverse idle gear 36 can be suppressed even if a position of a cantilevered reverse drive gear 26 is displaced by the deflection of a shaft, and thereby the uneven contact of the tooth contact of the reverse drive gear 26 and the reverse idle gear 36 can be corrected. Furthermore, as the uneven contact of the tooth contact of the reverse idle gear 36 and a reverse driven gear 16 can be simultaneously corrected, the engagement of the reverse gear row is entirely corrected. |
