Hydraulic Chassis Safety Lock Against Accidental Ground Lowering
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Solution Overview
Problem
Existing vehicle chassis control systems face challenges in preventing accidental lowering of the chassis to the ground due to actuator failures, requiring complex and bulky mechanical stops that are difficult to control remotely.
Innovation Solution
A safety device with a cylinder and piston arrangement that locks in a safety position when the actuator fails, using a fluid passage and safety valve to prevent unwanted rotation of the suspension arm, allowing remote control and integration with shock absorber functions for reduced size and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retractable mechanical stops are provided to prevent accidental chassis lowering, then safety is improved, but device complexity and size increase
Solution Approach 1:
The patent replaces complex retractable mechanical stops with a hydraulic safety device comprising a cylinder, piston, and fluid passage system. The safety function is achieved through hydraulic pressure control rather than mechanical linkages, simplifying the overall design while maintaining reliability.
Solution Approach 2:
The invention uses a hydraulic system with a cylinder, piston, and fluid passages to create the safety stop mechanism. The retractable stop is actuated through hydraulic pressure control, allowing for simpler implementation compared to purely mechanical retractable stop systems.
2Reliability
If retractable mechanical stops are provided to prevent accidental chassis lowering, then safety is improved, but the size of the stops increases
Solution Approach 1:
The patent replaces bulky mechanical stop structures with a compact hydraulic actuation system. The cylinder and piston assembly occupies less space than traditional mechanical stops while providing the same safety function through hydraulic pressure control.
Solution Approach 2:
The invention changes the operating parameters from mechanical force transmission to hydraulic pressure control. This allows for a more compact design as hydraulic systems can generate high forces in small volumes, reducing the overall size of the safety stop mechanism.
3Ease of operation
If mechanical stops are made remotely controllable, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent uses hydraulic fluid passages and pressure control to enable remote actuation of the safety stop. The hydraulic system allows the stop to be engaged or disengaged from the driver's seat through fluid pressure control, providing remote controllability without complex mechanical linkages or additional control mechanisms.
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 solution effectively prevents accidental chassis contact with the ground, enhances safety, and simplifies the design by enabling remote control, while reducing bulk and improving reliability through integrated fluid circuitry and anti-roll functionality.
Implementation Method 1
a jack, a cylinder of which is mounted on the chassis and a piston of which is mounted on the suspension arm
Implementation Method 2
the piston locks in a safety position at a distance from the bottom of the first chamber, position in which the fluid is compressed between the piston head and the safety valve
Data Source
Figure 1~3
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Figure 6~6'
AI summary
The invention relates to a vehicle comprising a controlled vertical position chassis, in order to be able to be moved into a low position supported on the ground, and, associated with each wheel, a suspension arm, an arm actuator, and a safety device (40) capable of limiting the accidental lowering of the chassis, the device (40) being able to adopt an active state in which the rotation of the suspension arm can be limited, the device (40) comprising an actuator (46), a cylinder (48) of which is mounted on the chassis (2) and a piston (50) of which is mounted on the suspension arm (28), or vice versa, the actuator defining a first chamber (54) connected to a first (62) and a second (64) fluid passage through the cylinder (48), the second passage (64) being connected to a first fluid pipe (68) fitted with a safety valve (72).