| 摘要 |
A serial box for quick speed alteration, wherein the speed alteration is possible without interrupting the transmission or without declutching of the clutch of the box, irrespective of the rotational speed of the engine. This is feasible since before the various pairs of gears a planetary revolution reducer is arranged. The pairs of revolution gears are arranged in two parallel shafts (2, 103), wherein on the one the gears have a permanent connection via a key (16), while on the other the connection is controlled. Based on where the connection is effected, the box presents two variations. In the first one, the common effector present may serve alternatively the bilateral gears (84, 85), while in the second one the position of the sphere screw (141) may also influence a series of radial connection activation bars (159) of each gear. The connection methods correspond to the two rotation directions, providing the same plurality of ratios between planetary reducer and gear pairs.
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