| 摘要 |
A change-speed driving gear comprising a housing, an input shaft journalled in said housing, an output shaft mounted to be partly rotatable about the input shaft, an output gear wheel rigidly arranged on the output shaft, at least one input gear wheel rotatably mounted on the input shaft, a first gear wheel being at least continuously in mesh with the input gear wheel and a second gear wheel axially coupled with the former and being continuously in mesh with the output gear wheel of a gear wheel set rotatably journalled parallel to the input shaft, coupling means for selectively coupling the input gear wheel or the output shaft with the input shaft and control means for the coupling means, said coupling means comprising coupling elements adapted to engage internal contact surfaces of the input gear wheel and the output shaft. Each internal engaging surface forms part of a cylindrical inner surface and each coupling element is a wedge element co-operating with a wedge surface of the input shaft. |
