| 摘要 |
A plural power speed changing gearbox comprises one or more input sections each comprising two co-planar sets of gears comprising input gears (22 and 24) each meshing two diametrically opposed intermediary gears (30A, 30B and 32A, 32B) respectively; the input gears of each set being mounted on an input shaft (20) and the intermediary gears (30A,32A and 30B,32B) being rotationally fixed to shafts (21A and 21B) respectively; the input gears being selectively drivingly engageable to the input shaft; the intermediary gears (30A and 30B) being in engagement with an output gear (40) with an axis offset and substantially parallel to that of the input shaft; the output gear forming a closed torque path. The output gear may form a ring gear integrated in a differential unit of a vehicle driveline. The selective engagement of the input gears may be by means of a conventional shift fork operated dog clutch (50) with rotational speed synchronising assisted by external means.
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