Hydraulic Circuit for Tractor with Lifting Connection Valve
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Solution Overview
Problem
Conventional hydraulic circuits for agricultural tractors suffer from inefficiencies in hydraulic pressure usage, particularly due to the unnecessary collection of hydraulic oil in the oil tank when the horizontal control cylinder is not in operation, leading to loss of hydraulic pressure.
Innovation Solution
The proposed hydraulic circuit includes a lifting connection valve that selectively connects or blocks the flow path between the hydraulic pump and the lifting control valve, allowing for preferential flow to the horizontal control cylinder during operation and redirecting excess flow to the lifting control cylinder when necessary, thereby optimizing hydraulic pressure usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the horizontal control valve completely opens or closes the flow path, then the horizontal control cylinder can be effectively controlled, but hydraulic pressure is lost when the horizontal control cylinder is not in operation
Solution Approach 1:
The lifting connection valve dynamically adjusts the flow path based on operational needs. When the horizontal control cylinder is not operating, the valve redirects hydraulic oil flow to the lifting control cylinder, preventing pressure loss. When horizontal control is needed, the valve switches to allow flow to the horizontal control cylinder. This dynamic routing resolves the contradiction between effective control and pressure loss.
Solution Approach 2:
The lifting connection valve acts as an intermediary component between the hydraulic pump and the lifting control valve. It mediates the flow distribution by selectively connecting or blocking the flow path, ensuring that hydraulic pressure is not wasted when the horizontal control cylinder is idle, thereby preventing energy loss while maintaining operational effectiveness.
2Ease of operation
If hydraulic oil is collected in the oil tank when horizontal control is not needed, then the system is simple to operate, but hydraulic pressure is unnecessarily lost
Solution Approach 1:
The hydraulic system maintains continuous useful action by redirecting hydraulic oil flow through the lifting control cylinder when horizontal control is not in use. Instead of allowing pressure loss and collection in the oil tank, the flow continues to serve a functional purpose, eliminating energy waste while maintaining operational simplicity.
3Adaptability or versatility
If the lifting control valve is always open to allow flow to the lifting control cylinder, then height control is always available, but hydraulic pressure is wasted when lifting control is not needed
Solution Approach 1:
The lifting connection valve dynamically controls the flow path to the lifting control cylinder based on actual operational needs. When height control is required, the valve opens to allow flow. When not needed, it closes to prevent pressure waste. This dynamic control maintains adaptability while eliminating energy waste.
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
This configuration minimizes the loss of hydraulic pressure by ensuring that hydraulic oil is utilized efficiently, either for horizontal control or height control, depending on the operational needs, thereby enhancing the overall efficiency of the hydraulic circuit.
Implementation Method 1
Hydraulic pressure is basically generated by a hydraulic pump and operates a hydraulic cylinder
Implementation Method 2
The horizontal control cylinder 120 operates using the flow supplied from the hydraulic pump 110. The horizontality of the working machine for a work target surface is controlled by operating the horizontal control cylinder 120
Implementation Method 3
The lifting control cylinder is disposed downstream of the lifting control valve 140 on the flow path of the hydraulic oil output from the hydraulic pump 110
Data Source
AI summary
Disclosed herein is a hydraulic circuit for an agricultural tractor. The hydraulic circuit includes: a hydraulic pump configured to supply hydraulic oil; a horizontal control cylinder configured to control the horizontality of a working machine for a work target surface by using a flow output from the hydraulic pump; a horizontal control valve disposed between the hydraulic pump and the horizontal control cylinder, and configured to control the operation of the horizontal control cylinder; a lifting control valve configured to control the operation of a lifting control cylinder that controls the height of the working machine for the work target surface; a lifting connection valve disposed between the hydraulic pump and the lifting control valve, and configured to selectively connect and block a flow path between the hydraulic pump and the lifting control valve; and a basic hydraulic line forming flow paths.