| 摘要 |
A gearbox includes an input shaft (2), an output shaft (4) substantially coaxial therewith and a layshaft (8) parallel thereto. The input shaft (2) carries two or more gearwheels (A, B) in mesh with respective gearwheels (F, G) carried by the layshaft (8). The layershaft carries further gearwheels (H, J, K) which are in mesh with respective gearwheels (C, D, E) carried by the output shaft (4). One of the gearwheels (B) on the input shaft (2) is rotationally coupled to a gearwheel (C) on the output shaft (4) to rotate therewith. The two rotationally coupled gearwheels (B, C) on the input and output shafts and at least certain (F, G, H, J, K) of the further gearwheels including a respective selectively operable rotary lock which is adapted to lock the gearwheel to the associated shaft (8) so that it rotates therewith. |
