Hauling Vehicle Steering Circuit with Throttled Accumulator Bleed-Down
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Solution Overview
Problem
The simultaneous occurrence of pressure oil release from the accumulator to the hydraulic fluid tank and cutoff of pressure oil supply to the steering circuit can lead to a failure in steering the wheels, necessitating fail-safe measures to prevent this scenario.
Innovation Solution
A hauling vehicle equipped with a composite control valve that allows pressure oil to be released from the accumulator to the hydraulic fluid tank while maintaining communication with the hydraulic source, utilizing a throttle to prevent simultaneous cutoff, ensuring continuous pressure oil supply to the steering circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate bleed-down control valve and priority valve are used to control pressure oil release and supply destination switching, then the steering system can maintain basic control capability, but the system complexity increases and the risk of simultaneous valve failure rises
Solution Approach 1:
The patent combines the bleed-down control valve and priority valve into a single composite control valve with integrated functions. This merging reduces the number of separate components, simplifies the hydraulic circuit, and eliminates the risk of simultaneous valve failure while maintaining the ability to control both pressure oil release and supply destination switching
Solution Approach 2:
The composite control valve is designed to perform multiple functions: it acts as both a bleed-down control valve for releasing pressure oil from the accumulator and a priority valve for switching pressure oil supply destinations between steering and hoist circuits. This multi-functionality reduces system complexity while maintaining reliability
2Loss of energy
If the bleed-down control valve is switched to the open position to release pressure oil from the accumulator, then the pressure oil can be discharged to the hydraulic fluid tank, but the steering circuit may experience pressure loss if the priority valve is simultaneously in the wrong position
Solution Approach 1:
By merging the bleed-down control and priority valve functions into a single composite control valve, the patent ensures that pressure oil release and supply destination switching are coordinated through one valve mechanism. This eliminates the possibility of simultaneous conflicting valve positions that could cause pressure loss while maintaining the ability to discharge pressure oil when needed
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 composite control valve prevents the simultaneous occurrence of pressure oil release and cutoff, maintaining steering functionality by allowing bleed-down with fluid resistance, thus ensuring reliable operation of the steering system.
Implementation Method 1
The accumulator stores pressure oil supplied from the hydraulic pump and can supply the stored pressure oil to the hydraulic actuator when the function of the hydraulic pump is lost
Implementation Method 2
utilizing a throttle to prevent simultaneous cutoff, ensuring continuous pressure oil supply to the steering circuit
Data Source
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AI summary
A hauling vehicle includes a steering circuit having a steering cylinder steered by pressure oil from a hydraulic source, a steering valve that controls the flow of pressure oil to the steering cylinder, and an accumulator that stores pressure oil from the hydraulic source and can supply it to the steering cylinder via the steering valve. The steering circuit is connected to the hydraulic source and the hydraulic fluid tank via a composite control valve. The composite control valve has a first position for communication between the steering circuit and the hydraulic source and blocking communication between the steering circuit and the hydraulic fluid tank, and a second position for communication between the steering circuit and the hydraulic source and communication between the steering circuit and the hydraulic fluid tank. The composite control valve has a throttle in the oil passage that connects the steering circuit in the second position with the hydraulic fluid tank.