Agricultural Hydraulic Supply with Cooling Fan Pump Steering Backup
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Solution Overview
Problem
Modern agricultural tractors require complex pressurized fluid supply systems with multiple pumps, leading to increased costs, space requirements, and reduced efficiency due to pumps circulating oil even when demand is zero, and lack adequate redundancy for continuous steering functionality in case of prime mover failure.
Innovation Solution
A pressurized fluid supply system with a main supply pump, a cooling fan pump acting as a secondary pump for the steering system, and an emergency steering pump, regulated by a prioritization valve that adjusts fluid flow based on pressure thresholds to ensure continuous steering functionality and reduce the number of pumps, thereby improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pumps are installed to ensure continuous steering functionality, then reliability is improved, but device complexity increases
Solution Approach 1:
The cooling fan pump is designed to perform dual functions: driving the cooling fan during normal operation and supplying pressurized fluid to the steering system when the prime mover fails. This multi-functionality reduces the number of dedicated pumps while ensuring continuous steering capability, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
A prioritization valve is introduced as an intermediary device to regulate fluid flow from the cooling fan pump to either the cooling fan motor or the steering system based on pressure thresholds. This mediator enables the single cooling fan pump to dynamically switch between functions, maintaining both cooling and steering reliability without requiring multiple dedicated pumps
2Reliability
If multiple pumps are installed to provide redundancy, then reliability is improved, but cost increases
Solution Approach 1:
The cooling fan pump serves as both a cooling system component and a backup steering pump, eliminating the need for a separate emergency steering pump. This reduces the total number of pumps from three to two, directly lowering system cost while maintaining redundancy for steering functionality
Solution Approach 2:
The cooling fan pump automatically provides backup steering function without requiring separate emergency steering infrastructure. The prioritization valve enables automatic switching based on pressure conditions, allowing the system to self-regulate and eliminate the need for additional redundant components
3Productivity
If multiple pumps are installed to meet various hydraulic demands, then productivity is improved, but use of energy increases
Solution Approach 1:
The cooling fan pump operates intermittently based on steering demand rather than continuously. The prioritization valve enables the pump to switch between driving the cooling fan and supplying the steering system as needed, reducing energy consumption compared to having multiple pumps running continuously or standby
Solution Approach 2:
The cooling fan pump maintains readiness to supply the steering system at all times through the prioritization valve mechanism, ensuring continuous hydraulic support capability without requiring separate continuous-operation pumps. This eliminates wasted energy from idle pumps while maintaining productivity
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 ensures continuous steering capability and reduces the number of pumps, lowering costs and improving efficiency by utilizing the cooling fan pump to support the steering system and emergency steering pump, while maintaining adequate cooling capacity.
Implementation Method 1
The prioritization valve has at least two operative configurations and is movable between the two operative configurations in dependence on the fluid pressure in the steering circuit
Data Source
AI summary
In a hydraulic system, such as for a tractor or other agricultural vehicle, a main supply pump supplies fluid to a steering system through a steering circuit and a second pump supplies fluid to a cooling fan motor. The second pump is connected with the steering circuit to provide a second a source of fluid to the steering system when the main supply pump is unable to meet demand. A prioritization valve regulates the flow of fluid from the second pump to the motor. The second pump acts as a secondary pump for the steering system and drives a cooling fan.