Transverse Lifting Gear for Semitrailer Support Height
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Solution Overview
Problem
Conventional lifting devices have a suboptimal lifting height/construction height ratio due to the arrangement of the lifting gear, which occupies a significant portion of the shaft tube's length, limiting the space available for the support tube and thus the achievable lifting height.
Innovation Solution
The output shaft of the lifting gear is arranged transversely to the lifting spindle, with a bearing device that allows independent inner bearing points, enabling the output shaft to extend only up to the lifting spindle, and a radial bearing mount for the lifting spindle, allowing maximum overlap between the support and shaft tubes, and a compact gear unit design that includes a quasi-internal gear cage for lubricant supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lifting gear is arranged above the pressure plate with the output shaft arrangement located above the pressure plate, then the lifting mechanism can be properly supported, but the overall height of the lifting device increases and the support tube length is reduced
Solution Approach 1:
The output shaft arrangement is rotated 90 degrees and arranged transversely to the lifting spindle axis, changing the spatial dimension from axial to radial arrangement. This dimensional change allows the output shaft to be received in a bearing device that is radially arranged relative to the lifting spindle, thereby reducing the axial height occupation while maintaining proper support of the lifting mechanism
2Ease of manufacture
If the lifting gear occupies a significant portion of the shaft tube length, then the lifting mechanism can be properly housed, but the achievable lifting height is reduced
Solution Approach 1:
The bearing device is designed to be received within the shaft tube, and the output shaft arrangement is nested within the bearing device. The lifting spindle passes through the bearing device, creating a nested configuration where multiple components are housed within each other. This nesting allows the lifting gear to be compactly arranged within the shaft tube volume without extending the overall shaft tube length
Data Source
Figure 1~4
Figure 5~6
AI summary
The invention relates to a lifting device (10), in particular semitrailer support or the like, having a shaft tube (11) and a support tube (12) which can be moved with respect to the shaft tube, wherein a lifting gear mechanism (26) is arranged on the shaft tube and has a drive shaft arrangement (27) for connecting a drive device, and has an output shaft arrangement (28) for driving a lift spindle (20) which is arranged in the support tube and which acts on a pressure plate (18) which is arranged in the shaft tube, wherein the pressure plate is located above the lifting gear mechanism.