A multiple-step gear drive

摘要: A gear transmission multistage comprises two fixed wheels, a drive wheel (4) and driven (5). For each stage, there is train, train consisting of or several gears (8, 11; 9; 10 12) which engage, these wheels being journalled rotatably in housing (6). It movable substantially parallel to plane perpendicular the shafts (1, 2) toothed so as be brought into precise position engagement for stage meshes with (4, 5). The (6) 10, are arranged that at least one can disengaged from its meshing opposite directions, thereby move corresponding selected direction interrupting link between gearwheels