| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide at least five forward speed steps and backward speed steps to be cynchronized by using as few kinds of parts as possible. SOLUTION: An output shaft 14 of a gear transmission 48 is free to connect to transmit to an input shaft 13 in parallel with the output shaft 14 by at least three gear steps 17, 18, 19 forming a forward speed step, and it is free to selectively connect to transmit to a differential gear device 15 of an axle providing a central axis 16-16 against the input shaft 13 and the output shaft 14 respectively.</p> |
