| 摘要 |
The invention concerns a system for the axial operation of a shaft (1) to one or more positions. The operation is achieved by one or more functional blocks that can be combined with each other and that can drive the shaft in either direction with variable steps, with variable speed and with variable force; or that are arranged to disengage, brake or lock the shaft (1). The functional blocks comprise a magnetic core (6) with a winding (7) together with a moving magnetic part (8) arranged on the shaft (1) and means (11.13) to achieve locking between the shaft and the locking means, for movement of the shaft together with the moving part (8) when the latter is drawn towards the core (6) on magnetisation. One special use of the invention is in association with gear-boxes of vehicles, in which combinations of units give a simple solution with great rapidity and force. |
