Vehicle Height Hydraulics With Pressure-Switched Flow Reversal
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Solution Overview
Problem
Existing vehicle hydraulic systems for straddle-type vehicles face limitations in quickly adjusting vehicle height due to slow hydraulic fluid flow and high costs associated with electromagnetic valves in pneumatic systems.
Innovation Solution
A vehicle hydraulic system with a pump capable of forward and reverse rotation operations and a switching valve that adjusts flow direction based on suction and discharge pressures, allowing rapid height adjustments and reducing system costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a screw pump is used in the vehicle hydraulic system, then the system structure is simple, but the hydraulic fluid flow speed is slow and vehicle height adjustment is slow
Solution Approach 1:
The pump rotation direction is made dynamically switchable between forward and reverse directions. The switching valve dynamically changes the hydraulic circuit configuration based on pressure differential signals, enabling the pump to alternately suck and discharge hydraulic fluid. This dynamic operation significantly increases hydraulic fluid flow speed and enables rapid vehicle height adjustment while maintaining system structural simplicity.
2Speed
If an exhaust valve (electromagnetic valve) is used in the vehicle pneumatic system, then vehicle height can be quickly adjusted, but the system cost increases due to expensive valves and wiring requirements
Solution Approach 1:
The switching valve operates autonomously based on pressure differential signals from the hydraulic circuit itself. When the pump discharges hydraulic fluid, the discharge pressure opens the switching valve; when the pump sucks hydraulic fluid, the suction pressure closes the switching valve. This self-service mechanism eliminates the need for expensive electromagnetic valves and their associated wiring control systems, significantly reducing system cost while maintaining fast vehicle height adjustment capability.
3Device complexity
If the pump rotates in a single direction, then the pump structure is simple, but the flow direction in the hydraulic circuit cannot be switched for rapid height adjustment
Solution Approach 1:
The pump rotation direction is made dynamically switchable between forward and reverse directions through the switching valve mechanism. The valve responds to pressure differential signals to alternately connect the pump inlet and outlet to different hydraulic circuit paths, enabling the pump to switch between sucking and discharging hydraulic fluid. This dynamic adaptability allows rapid vehicle height adjustment while keeping the pump structure relatively simple.
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 quick vehicle height adjustments and lowers the overall cost of the hydraulic system by optimizing fluid flow direction switching.
Implementation Method 1
a switching valve configured to switch a flow direction in the hydraulic circuit according to a change in suction pressure and discharge pressure of the pump
Data Source
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AI summary
The vehicle hydraulic system (50) includes a hydraulic circuit (70) connecting a reservoir (60) that stores a hydraulic fluid and a jack chamber (43) of a hydraulic jack (40), a pump (80) interposed in the hydraulic circuit (70), and capable of a forward rotation operation and a reverse rotation operation, and a switching valve (100) configured to switch a flow direction in the hydraulic circuit (70). The switching valve (100) switches a flow direction in the hydraulic circuit (70) according to a change in the suction pressure and the discharge pressure of the pump (80) due to switching between the forward rotation operation and the reverse rotation operation of the pump (80).