Hydropneumatic Crane Suspension with Deactivatable Roll Stabilization
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Solution Overview
Problem
Mobile cranes experience undesirable chassis behavior and reduced traction due to roll stabilization, particularly when counterweights or the boom are removed or reconfigured, leading to 'hard' chassis behavior and loss of traction, especially during cornering and off-road driving.
Innovation Solution
A hydropneumatic suspension system with a roll stabilization device that allows selective activation and deactivation of hydraulic connections between suspension struts on either side of the vehicle, using a switching device with valves to manage fluid connections and maintain optimal chassis behavior based on driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If roll stabilization is activated to prevent critical driving conditions during cornering, then vehicle stability is improved, but traction of drive wheels is reduced
Solution Approach 1:
The system dynamically switches between roll stabilization mode and traction mode based on driving conditions. The switching device enables the hydraulic connections to be selectively activated or deactivated, allowing the suspension system to adapt its behavior from stable (cross-connected) to flexible (independent) as needed for optimal performance in different scenarios
2Stability of the object's composition
If roll stabilization is activated to improve driving behavior, then chassis stability is improved, but axle articulation range is reduced
Solution Approach 1:
The system transitions from a static roll stabilization configuration to a dynamic system that can switch between stabilized and articulated states. When axle articulation is needed (such as during off-road driving or when navigating obstacles), the switching device deactivates the cross hydraulic connections, allowing each spring strut to operate independently and achieve full articulation range
3Stability of the object's composition
If roll stabilization is activated to prevent rolling movements, then vehicle stability is improved, but undercarriage frame loads increase
Solution Approach 1:
The system dynamically adjusts the load distribution on the undercarriage frame by switching between roll stabilization and independent suspension modes. During off-road driving or when navigating uneven terrain, deactivating the roll stabilization allows each wheel to independently absorb impacts, significantly reducing peak loads transmitted to the undercarriage frame while maintaining vehicle stability on paved surfaces
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables improved driving behavior by allowing manual or automatic deactivation of roll stabilization, reducing the risk of traction loss and chassis overload, and maintaining optimal suspension performance across various driving conditions.
Implementation Method 1
a roll stabilization device having a hydraulic connection between the piston chamber of the right strut and the annular chamber of the left strut, and a hydraulic connection between the piston chamber of the left strut and the annular chamber of the right strut
Data Source
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AI summary
The invention relates to a hydropneumatic mobile crane suspension system (1) comprising: - at least one left strut (2) assigned to the left side (L) of the chassis, with a piston chamber (2A) and an annular chamber (2B); - at least one right strut (3) assigned to the right side (R) of the chassis, with a piston chamber (3A) and an annular chamber (3B); - a roll stabilization device (4) comprising a hydraulic connection (4A) between the piston chamber (3A) of the right strut (3) and the annular chamber (2B) of the left strut (2), and a hydraulic connection (4B) between the piston chamber (2A) of the left strut (2) and the annular chamber (3B) of the right strut (3); and - a switching device (5) which selectively disconnects or releases the hydraulic connections (4A, 4B) provided by the roll stabilization device (4).