| 摘要 |
<p>1. Switching device for toothed gear-change boxes in group drive arrangement for motor vehicles, particularly farm tractors, comprising a range shift transmission unit, a gear-shift transmission unit with at least two numbers of gears and a common speed selector lever (7), the movements of said lever are transferable to a gear-shift-lever shaft (27) being axially shiftable and pivotally supported in a bearing housing (11), said gear-shift-lever shaft (27) carrying a sleeve member (38) axially fixed and rotationally movable on said gear-shift-lever shaft, said sleeve member actuating a gearshift lever (16), belonging to the range shift transmission unit, after exceeding a certain axial movement of the gear-shift-lever shaft, to which furthermore two axially spaced coupling elements (28, 29) are fixedly secured for reciprocal actuating one of two gear-shift levers (13, 14), belonging to the gear shift transmission unit, by axial shifting and twisting of the gear-shift-lever shaft (27), characterized in that the gear-shift levers (13, 14) of the gear-shift transmission unit are freely supported on the gear-shift-lever shaft (27) and are provided with recesses (31, 32) positioned diametrically opposite within the range of the support, coupling elements engageable in said recesses, said coupling elements are designed as tripping pins (28, 29) projecting radially from the gear-shift-lever shaft (27) ; and that the sleeve member (38) is provided with a shift finger (37), interacting with its free end (39) with a shifting mechanism (40).</p> |
