Hydraulic Neutral Cut Valve Layout for Expandable Output Circuits
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Solution Overview
Problem
Existing fluid pressure control devices have limited flexibility in circuit system expansion, as they typically allow only one external output passage, restricting the ability to connect additional circuit systems.
Innovation Solution
The fluid pressure control device incorporates a neutral cut valve and multiple external output passages, allowing working oil from one circuit system to be supplied to another, enabling the expansion of circuit systems without the need for additional hydraulic pumps or extensive piping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only one external output passage is provided in the first circuit system, then the device structure remains simple, but the degree of freedom in circuit system expansion is limited
Solution Approach 1:
The neutral cut valve is designed to perform multiple functions: it controls the neutral passage communication with the tank, manages external output passage connectivity, and enables circuit system expansion. By making this single valve multi-functional, the patent avoids adding separate control mechanisms for each function, thus improving adaptability without proportionally increasing device complexity
Solution Approach 2:
The neutral cut valve dynamically switches between different positions (first position connecting neutral passage to tank, second position connecting external output passage to the neutral passage upstream) based on operational requirements. This dynamic positioning capability allows the circuit system to be reconfigured for different expansion scenarios, enhancing versatility while maintaining a relatively simple structural foundation
2Adaptability or versatility
If multiple external output passages are added to enable circuit system expansion, then the degree of freedom in circuit system expansion is improved, but the device complexity increases
Solution Approach 1:
The patent merges the control functions for multiple passages into a single neutral cut valve. Instead of providing separate control valves for each external output passage, the neutral cut valve integrates control over the neutral passage and external output passage connectivity, reducing the number of control components while enabling circuit expansion
Solution Approach 2:
The neutral cut valve acts as an intermediary component that mediates between the pump, neutral passage, external output passage, and tank. By positioning this valve at a strategic point in the circuit, it enables flexible routing of the working fluid to different destinations without requiring complex direct connections from the pump to each destination
Data Source
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AI summary
A first circuit system (HC1) of the fluid pressure control device (100) includes the neutral cut valve (110) being configured to make the first neutral passage (11) and the tank (T) communicate with each other or block communication between the first neutral passage (11) and the tank (T), the first external output passage (14) through which the working fluid is able to be supplied to outside, the first external output passage (14) being in communication with the downstream side of the first control valve (12) and the upstream side of the neutral cut valve (110) in the first neutral passage (11), and the second external output passage (15) through which the working fluid guided via the neutral cut valve (110) is able to be supplied to the outside. The neutral cut valve (110) is switched among the first position (P1) at which the working fluid is enabled to be guided to the tank T, the second position (P2) at which the working fluid is disabled to be supplied to the outside through the second external output passage (15), and the third position (P3) at which the working fluid is enabled to be supplied to the outside through the second external output passage (15).