| 摘要 |
The invention relates to a lifting device (10), in particular a semitrailer support or the like, comprising a shank tube (11) and a support tube (12) which is movable with respect to the shank tube, wherein on the shank tube a lifting gear mechanism (26) is arranged which comprises an input shaft arrangement (27) for connecting a drive device and an output shaft arrangement (28) for driving a lifting spindle (20) which is arranged within the support tube, wherein the input shaft arrangement and the output shaft arrangement each comprise at least one large-diameter gearwheel (70, 80) and one small-diameter gearwheel (62, 81) which can be put in force-fitting engagement with one another to generate different transmission ratios, wherein the input shaft arrangement comprises a hollow shaft (86) supported in a gear housing (68), and an axially movable gearshift shaft (85) which is arranged coaxially with respect to the hollow shaft and which is supported in the gear housing, wherein the hollow shaft serves for the rotationally fixed arrangement of the large-diameter gearwheel (78), and the gearshift shaft serves for the rotationally fixed arrangement of the small-diameter gearwheel (pinion) (62), and the hollow shaft and the gearshift shaft are provided with engagement devices which can be put in coupling engagement by means of axial movement in order to change the transmission ratio. |
