Hydraulic Circuit With Shared Bypass for Quick Return and Regeneration
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Solution Overview
Problem
The existing hydraulic circuits for construction machines require additional control valves for quick return and regeneration circuits, leading to increased size and cost due to the need for more components.
Innovation Solution
A hydraulic circuit design incorporating a direction switching valve and a pilot operation control valve in the bypass oil path, allowing the bypass oil path to function as both a quick return and regeneration circuit, eliminating the need for separate control valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control valves are provided for quick return circuit and regeneration circuit, then the hydraulic circuit can achieve proper oil flow control, but the number of parts increases causing cost increase and size increase
Solution Approach 1:
The patent merges the control functions for both quick return circuit and regeneration circuit into a single control valve. The control valve has a spool that can be positioned to achieve different connection states, combining what would traditionally require two separate valves into one integrated component, thereby reducing part count while maintaining proper oil flow control
Solution Approach 2:
The single control valve is designed to perform multiple functions: it controls both the quick return circuit and the regeneration circuit depending on its spool position. This multi-functional valve replaces two dedicated control valves, achieving the same hydraulic control objectives with fewer components
2Reliability
If two control valves are provided for quick return circuit and regeneration circuit, then proper oil flow control is achieved, but the hydraulic apparatus size increases
Solution Approach 1:
By merging the control functions into a single valve assembly, the physical space required for housing two separate control valves is eliminated. The integrated valve occupies less space than two separate valves would require, thereby reducing the overall hydraulic apparatus size while maintaining proper oil flow control
3Reliability
If two control valves are provided for quick return circuit and regeneration circuit, then proper oil flow control is achieved, but the cost increases due to increase in number of parts
Solution Approach 1:
The patent combines the functionality of two control valves into one, directly reducing the number of parts that need to be manufactured, procured, and assembled. This merger reduces material costs, manufacturing costs, and assembly costs while maintaining the necessary oil flow control functionality
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 design prevents size and cost increases by enabling the bypass oil path to selectively function as both circuits, reducing the number of required control valves and components.
Implementation Method 1
a pilot operation control valve in a middle of the bypass oil path
Data Source
AI summary
A hydraulic circuit includes: a direction switching valve, which is in a state where a bottom oil path is connected to a first tank oil path and where a bypass oil path is connected to a second tank oil path when a pump oil path is connected to a rod oil path and when the rod oil path is connected to the bypass oil path when the pump oil path is connected to the bottom oil path, and a pilot operation control valve which allows flows of oil in both directions between the direction switching valve and the bottom oil path when the pump oil path is connected to the rod oil path and allows only a flow of oil from the direction switching valve to the bottom oil path when the pump oil path is connected to the bottom oil path by the direction switching valve.