Hydraulic Circuit Merging Valve Design for Construction Machinery
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Solution Overview
Problem
Conventional hydraulic circuits for construction machines face limitations in supplying sufficient hydraulic oil to motors and actuators, leading to restricted running speed and increased complexity due to the need for multiple valves and a double structure spool.
Innovation Solution
A compact hydraulic circuit design featuring center bypass type changing valves and a single merging valve that prioritizes oil supply from both pumps to motors and actuators, with pressure compensation valves to adjust pressure and ensure efficient oil distribution, allowing for mutual compensation between systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a merging valve and changing valve are provided to secure independent state of running system, then the independent control of running system and other actuator is improved, but the hydraulic circuit becomes larger and more complex
Solution Approach 1:
The patent combines the merging valve and changing valve functions into a single integrated valve unit. This valve can selectively connect pump discharge to either the running motors or the actuator, and can also merge flows from both pumps. By merging multiple valve functions into one component, the patent reduces the number of separate valves needed while maintaining the ability to independently control the running system and actuator.
Solution Approach 2:
The integrated valve performs multiple functions: it acts as a merging valve to combine flows from two pumps, and as a changing valve to selectively supply hydraulic oil to different circuits. This multi-functional design eliminates the need for separate dedicated valves for each function, simplifying the overall hydraulic circuit while preserving operational flexibility.
2Adaptability or versatility
If merging valve and changing valve are provided with double structure spool, then the independent state of running system is secured, but the hydraulic circuit becomes a complex mechanism
Solution Approach 1:
The patent integrates multiple valve functions into a single valve body with a unified spool mechanism. Instead of providing separate double-structure spools for merging and changing functions, the invention uses one spool that can perform both functions by moving to different positions, thereby reducing mechanical complexity while maintaining full control capability.
3Adaptability or versatility
If merging valve is located at interruption position and changing valve at second position, then independent state is secured, but the amount of hydraulic oil supplied to running motors runs short and running speed is limited
Solution Approach 1:
The patent employs a dynamic valve system that can adapt its configuration based on operational requirements. The integrated valve can switch between different connection modes: supplying both pumps to running motors for high-speed operation, or isolating systems for independent actuator control. This dynamic reconfigurability allows the system to optimize hydraulic oil distribution for either speed or independent control depending on the operational phase.
Data Source
AI summary
To provide a hydraulic circuit with a compact and simple structure while securing the amount of a hydraulic oil necessary for right and left running motors so as to prevent the limitation of a running speed. A first system has a changing valve for a right side running motor and a changing valve for a first actuator, and a second system has a changing valve for a left side running motor and a changing valve for a second actuator. The changing valves for the right side and the left side running motors and the changing valves for the first and second actuators are tandem-connected, respectively. A merging valve has a merging position to communicate first and second supply paths with each other and interrupt supply paths for right side and left side running, a merging position to communicate the first and second supply paths with each other and communicate the supply paths for right side and left side running with each other, and a merging position to interrupt the first and second supply paths and interrupt the supply paths for right side and left side running.