Road-building machine wheel height adjustment
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Solution Overview
Problem
Existing road-building machines face instability and impaired milling results when encountering obstacles due to the inability to simultaneously mount both front and rear wheels with positive coupling, leading to uneven weight distribution and reduced stability.
Innovation Solution
The implementation of a road-building machine with actuating members connected rigidly to the chassis, allowing for simultaneous height adjustment of all wheels through a positive coupling system, where the left front and right rear wheels adjust in opposite directions, and the left front and right rear wheels adjust in the same direction, enhancing stability and obstacle compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only the front wheels are mounted with positive coupling to compensate for transverse inclinations, then the machine can react to elevations or depressions on one side of the road, but the obstacle acts to its full extent on the vehicle frame in the region of the nonfloatingly mounted rear wheels, which is detrimental to the stability of these machines
Solution Approach 1:
The patent combines positive coupling for both front and rear wheels, merging the obstacle compensation functionality across all four wheels. The hydraulic coupling system connects all wheels through a common hydraulic circuit, allowing simultaneous contradirectional adjustment of front and rear wheels when one side encounters an obstacle, thereby distributing the obstacle's effect and maintaining machine stability.
Solution Approach 2:
The patent segments the wheel suspension system into independently controllable front and rear wheel pairs, each capable of contradirectional adjustment. This segmentation allows the front wheels to compensate for transverse inclinations while the rear wheels simultaneously compensate, with each pair operating semi-independently through the hydraulic coupling system.
2Stability of the object's composition
If both front wheels and rear wheels are mounted floatingly with positive coupling, then the stability of the machine is improved, but this would lead to an unstable position of the machine
Solution Approach 1:
The patent implements a feedback-controlled hydraulic coupling system that continuously monitors wheel position and adjusts hydraulic pressure to maintain stable machine positioning. The system uses the machine's weight distribution and terrain conditions as feedback to regulate the degree of floating mounting, preventing excessive instability while maintaining obstacle compensation capability.
Solution Approach 2:
The patent employs a dynamic coupling system where the degree of floating mounting is not fixed but adapts to operating conditions. The hydraulic coupling allows the front and rear wheels to dynamically adjust their position relative to the frame, providing stability when needed and flexibility when encountering obstacles, thereby resolving the contradiction between stable positioning and obstacle compensation.
3Device complexity
If the track of the machine is relatively low in relation to the wheel base, then the machine structure is compact, but the milling result is impaired due to the disruptive effect of oblique setting when traveling over obstacles
Solution Approach 1:
The patent replaces the traditional mechanical rigid axle connection with a hydraulic coupling system that can actively compensate for oblique setting. Instead of relying solely on mechanical geometry, the system uses hydraulic actuation to maintain proper wheel alignment and milling roller orientation even when the machine has a compact low track configuration, thereby preserving milling precision.
Solution Approach 2:
The patent changes the operational parameters of the wheel mounting system by introducing active height adjustment capability. The wheels can dynamically change their vertical position relative to the frame through hydraulic actuation, allowing the machine to maintain optimal milling parameters despite having a compact low-track structure that would otherwise be prone to oblique setting when encountering obstacles.
Data Source
AI summary
The invention relates to a road-building machine whose left front wheel (4) or caterpillar, right front wheel (6) or caterpillar, left rear wheel (8) or caterpillar and right rear wheel (10) or caterpillar are connected to the road-building machine chassis by means of an actuating element and are height-adjustable with respect to the road-building machine frame. According to said invention, different actuating elements are rigidly connected to the road-building machine chassis and forcedly coupled to each other in such a way that the left front wheel (4) or caterpillar and the right rear wheel (10) or caterpillar are height-adjustable in the same direction and with respect to the right front wheel (6) or caterpillar and the left rear wheel (8) or caterpillar are adjustable in the opposite directions. The all wheels (4, 6, 8, 10) or caterpillars are equally height-adjustable. The inventive road-building machine provides a high operational stability, the improved compensation of the adjustment of lateral hindrance inclination of the road-building machine and the irregularities in the longitudinal direction thereof.