Hydraulic Control Valve Layout With Parallel Feeder Oil Paths
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Solution Overview
Problem
Conventional valve apparatuses for hydraulic systems, such as those used in hydraulic excavators, face challenges of increased size and complexity due to complex oil path structures and the need for multiple pumps, leading to larger and more intricate control valve designs.
Innovation Solution
A valve apparatus with spool holes and spools that configure a bridge circuit to control fluid flow and direction, featuring parallel feeder paths connected to discharge sources through spool holes without being cut off by spool displacement, and a switching valve to communicate with tanks during non-operation, allowing for simplified structure and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a center bypass circuit is provided in the control valve for negative flow control pressure detection, then pump control (negative control) can be achieved, but the oil path structure becomes complex and the valve body size increases
Solution Approach 1:
The patent extracts the negative flow control pressure detection function from the center bypass circuit by providing a separate detection oil path that connects the spool hole to the tank. This separates the detection function from the main flow control path, eliminating the need for a complex center bypass circuit while maintaining pump control capability.
Solution Approach 2:
The patent segments the control valve into distinct functional sections: a detection section with separate detection oil paths for negative flow control pressure detection, and a control section with spools for flow control. This segmentation allows each section to be optimized independently, reducing overall complexity.
2Adaptability or versatility
If parallel feeder circuits are provided to feed pressure oil to actuators via each valve section, then actuator control is enabled, but the valve body becomes larger and the casting shape becomes complex
Solution Approach 1:
The patent implements a universal parallel feeder circuit design where a single detection oil path structure serves multiple valve sections. The detection oil path connects through the valve body to provide negative flow control pressure detection for multiple actuators, eliminating the need for separate detection paths for each section and reducing overall valve body size.
3Power
If multiple hydraulic pumps are used to drive multiple actuators, then system power and flow capacity increase, but the control valve structure becomes more complex requiring separate positioning for each valve section
Solution Approach 1:
The patent merges the control functions for multiple pump systems into a single integrated control valve body. The bridge circuit configuration allows spools from different pump sections to control the same actuator, combining multiple control paths into a unified structure that reduces overall complexity.
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 solution enables a smaller and more cost-effective valve body with simplified structure, allowing for flexible positioning of sections and efficient operation of multiple actuators by controlling fluid pressure and flow, reducing the complexity and size of the valve apparatus.
Implementation Method 1
spools that are provided free to be displaced respectively inside these spool holes, and configures a bridge circuit that controls the flow amount and direction of working fluid that is fed to the actuator
Implementation Method 2
parallel feeder paths that are respectively connected to the discharge source and provided in a linearly line to the valve main body through the plural number of spool holes, and is not cut off by spool displacement
Implementation Method 3
a switching valve to communicate with tanks during non-operation
Data Source
AI summary
It is to provide a control valve that can make the valve body smaller and the structure simplified and the hydraulic pressure system equipped therewith. The plural number of parallel feeder oil paths that are respectively connected to the plural number of pumps and are not cut off by displacement of spools is provided in the valve body in a linearly through all spool holes. For each section, a connection oil path is provided to connect any one side of parallel feeder oil paths to the bridge circuit B of the internal spools. Parallel feeder oil paths can be positioned in a simple shape, but also, just by properly providing connection oil paths, without depending on each section belonging to any of pump systems, positioning of section can be freely done within the valve body. Making the valve body smaller and the structure simplification can be executed.