| 摘要 |
PURPOSE:To reduce the cost of a transmission formed in remarkably small size by constituting a transmitting shaft of a tubular shaft and an internal shaft, inserted to be fitted to the tubular shaft, to be formed into a double shaft while mounting a gear wheel of a subtransmission drive gear to a differential gear case. CONSTITUTION:A transmitting shaft is constituted of a tubular shaft 17 and an internal shaft 13, inserted to be fitted to the tubular shaft 17, into a double shaft, while driving the inner and outer shafts to be separately rotated. This transmitting shaft, in order to connect to its rear part a transmission differential gear 20, connects the internal shaft 13 to be associated with one side gear 21 while the tubular shaft 17 to be associated with the other side gear 23. This transmission differential gear 20 mounts to its differential case 20a a gear wheel 33a of a subtransmission drive gear 33 consisting of large and small gears. Thus generating a speed difference between the internal shaft 13 and the tubular shaft 17 and by inversely rotating these shafts, a tractor enables its transmission to be remarkably miniaturized.
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