| 主权项 |
1. A multi ratio drive operably connecting a drive shaft and an axle, the multi ratio drive comprising:
a housing; a first piston longitudinally slideable in the housing; and a second piston longitudinally slideable in the housing; a first drive chain having a first drive chain engaged state and a first drive chain disengaged state; the first drive chain comprising a first sun gear, a first planet gear, and a first ring gear; the first sun gear being disposed on a sun gear shaft; the first planet gear being engaged with the first sun gear, being rotatable about the sun gear shaft, and being operably connected to rotate a planet carrier about the sun gear shaft; and the first ring gear being engagable with the first planet gear, being longitudinally slideable and rotatably fixed in the housing, and being coupled to the first piston; and a second drive chain having a second drive chain engaged state and a second drive chain disengaged state; the second drive chain comprising a second sun gear, a second planet gear, and a second ring gear; the second sun gear being disposed on a sun gear shaft; the second planet gear being engaged with the second sun gear, being rotatable about the sun gear shaft, and being operably connected to rotate the planet carrier about the sun gear shaft; and the second ring gear being engagable with the second planet gear, being longitudinally slideable and rotatably fixed in the housing, and being coupled to the second piston; wherein the first drive chain drives the axle with a first gear ratio between the drive shaft and the axle when the first drive chain is in the first drive chain engaged state and the second drive chain is in the second drive chain disengaged state; and the second drive chain drives the axle with a second gear ratio between the drive shaft and the axle when the second drive chain is in the second drive chain engaged state and the first drive chain is in the first drive chain disengaged state; and the first gear ratio is different from the second gear ratio; the first piston positions the first ring gear to engage the first planet gear when the first drive chain is in the first drive chain engaged state; and the second piston positions the second ring gear to engage the second planet gear when the second drive chain is in the second drive chain engaged state. |
