| 摘要 |
An input shaft 19, 21 carries high speed range and low speed range input gears 27 and 25 and a reverse gear 43. A forward synchronized clutch 29 can selectively couple either of the gears 25 and 27 to the input shaft. A non-synchronized reverse clutch 45 can couple the reverse gear 43 to the input shaft. The gears on the input shaft are in constant mesh with gears on a counter-shaft 55, via gears on a reverse counter-shaft in the case of the reverse gear 43. Gears on the counter-shaft are also in constant mesh with gears on a gear shaft 65 provided with clutches 85 and 87 for selecting three speeds in either speed range. A gear 73 fixed on the gear shaft 65 is in constant mesh through a gear 75 with a gear 81 fixed on the output shaft 83. When the vehicle is stopped and reverse is to be engaged the reverse gear 43 is stopped because one of the clutches 85 and 87 will already be engaged while the input shaft still rotates because of drag through the main clutch. Gear clashing is nevertheless avoided because the selector mechanism for the clutches 29 and 45 is arranged, in going from neutral to reverse, momentarily to engage the clutch 29 with the gear 27 (which is also stopped) before engaging the clutch 45, whereby the input shaft is stopped before the reverse clutch is engaged. <IMAGE> |
