Hydraulic Suspension Mode Switching for Stable Travel and Dumping
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Solution Overview
Problem
Rigid haulers with hydraulic suspension systems face a trade-off between dynamic stability during travel and reduced frame twisting during dumping on uneven ground, leading to increased wear on components due to lateral movements of the dump body.
Innovation Solution
A fluid-based suspension system with a first and second fluid suspension device, connected via a valve arrangement that can switch between cross-connected and pendulum-connected modes, allowing for dynamic stability during travel and reduced frame twisting during dumping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the hydraulic suspension system is cross-connected to provide dynamic stability, then the dynamic stability of the vehicle is improved, but the frame twisting increases when standing on uneven ground
Solution Approach 1:
The suspension system allows dynamic switching between two operating modes: cross-connected mode for dynamic stability during travel, and uncoupled mode for reducing frame twisting during dumping operations. This enables the system to adapt its stiffness characteristics based on the operational phase, resolving the contradiction between stability and frame deformation.
Solution Approach 2:
The system changes the fluid connection configuration between suspension chambers by switching valve positions, thereby altering the effective stiffness parameter of the suspension system. In the first valve position, cross-connections create a stiff system for stability; in the second position, uncoupled chambers allow independent movement to reduce frame twisting.
2Shape
If the suspension system stiffness is reduced to minimize frame twisting, then the frame twisting is decreased, but the dynamic stability of the vehicle is reduced
Solution Approach 1:
The system dynamically adjusts its stiffness characteristic by switching between two configurations: a stiff cross-connected mode for travel stability and a compliant uncoupled mode for dumping operations. This temporal separation of stiffness requirements resolves the contradiction between stability and frame twisting reduction.
Solution Approach 2:
The valve arrangement changes the fluid pressure distribution and chamber connections, effectively changing the suspension stiffness parameter. When uncoupled, each chamber operates independently with reduced effective stiffness, allowing frame to accommodate uneven ground without excessive twisting.
3Shape
If the cross-connections are fluidly isolated to reduce frame twisting, then the frame twisting is reduced, but the dynamic stability during travel is compromised
Solution Approach 1:
The system employs dynamic reconfiguration of fluid connections based on operational mode. During travel, cross-connections are active to provide stability; during dumping, connections are isolated to reduce frame twisting. This temporal separation allows both requirements to be satisfied at different times.
Solution Approach 2:
The valve arrangement controls the fluid connection topology, changing from a cross-connected configuration (providing stability) to an uncoupled configuration (reducing frame twisting). This parameter change in connection topology resolves the contradiction by adapting to different operational phases.
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
The system maintains dynamic stability during travel while minimizing frame twisting and component wear by selectively adjusting the suspension mode based on operating conditions.
Implementation Method 1
a first fluid suspension device provided on a first side of the vehicle and providing suspension between an axle and a frame of the vehicle, the first fluid suspension device comprising a first cylinder, a movable first piston
Data Source
AI summary
A fluid-based suspension system of a vehicle including a first suspension device comprising a movable first piston dividing a first cylinder into a first piston rod side chamber and a first piston side chamber. The fluid-based suspension system further including a second suspension device, comprising a movable second piston dividing a second cylinder into a second piston rod side chamber and a second piston side chamber, and a fluid connection system configured to set the fluid-based suspension system to one of a first and a second operating mode.