| 摘要 |
A main gear comprises dual clutches (C1) and (C2) operating in conjunction with synchronised selectors (A) and (B) to enable power shifting changes between four basic gears. The clutches (C1) and (C2) control odd and even numbered gears respectively. A range gear has a selector (D) whereby the main gear output shaft (13) is either coupled to the range gear output shaft (14) directly or by way of speed-reducing gears (G8B, G8T, G4T and G4B). The latter gearwheel (G4B) is coupled to the shaft (14) by a selector (E) which alternatively selects reverse gear. Speeds 1, 2, 3 and 5, 6, 7 are provided in this conventional manner. However speed 4 is provided direct to the output shaft (14) through the gears (G4T) and (G4B) with the selector (B) to the left and selector (E) to the right. This makes power shifting possible not only within each range but also between the high and low ranges. Speed 8 is provided by gears (G8T) and (G8B) with the selector (B) to the left and selector (D) engaging both to the left and the right so as to couple gearwheel (G8B) to the output shaft (14). |
