Detachable Sub-Valve Block Layout for Compact Fluid Pressure Control
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Solution Overview
Problem
Existing fluid pressure control devices in construction machines face challenges with increased housing size due to complex oil passages and difficulty in guiding discharge pressure to solenoid proportional pressure reducing valves.
Innovation Solution
A fluid pressure control device with a main valve block and detachable sub-valve block, where the primary pressure generating valve is located in the sub-valve block, simplifying oil passages and allowing for the discharge pressure of a pilot pump to be guided as a primary pressure as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure reducing valve is provided in the housing of the control valve, then the primary pressure can be generated within the housing, but the oil passage becomes complicated and the housing becomes large in size
Solution Approach 1:
The invention divides the pressure control system into two separate components: a control valve housing and a detachable sub-valve block. The sub-valve block contains the primary pressure generating valve and related oil passages, while the control valve housing contains only the control valve. This segmentation allows the primary pressure generation function to be separated from the control valve, simplifying the housing structure and reducing its size while maintaining the ability to generate primary pressure.
Solution Approach 2:
The invention extracts the primary pressure generating valve and its associated oil passages from the control valve housing, placing them in a separate detachable sub-valve block. This extraction eliminates the complexity of oil passages within the housing and reduces the housing size, while the extracted components remain functional when attached to the housing via detachable coupling means.
2Reliability
If the pressure reducing valve is provided in the housing of the control valve, then the primary pressure can be controlled, but it is difficult to guide the discharge pressure of the pilot pump to the solenoid proportional pressure reducing valve as it is
Solution Approach 1:
The invention segments the oil passage system into distinct sections: the sub-valve block contains the first introduction passage for receiving pilot oil and the first primary pressure passage for delivering primary pressure, while the control valve housing contains the solenoid proportional pressure reducing valve. This segmentation allows the discharge pressure of the pilot pump to be guided directly to the solenoid valve through the detachable coupling, simplifying the overall oil passage configuration while maintaining pressure control capability.
Solution Approach 2:
The detachable sub-valve block serves multiple functions: it generates primary pressure through the primary pressure generating valve, provides oil passages for pilot oil flow, and enables flexible connection to the control valve housing. The detachable coupling means allows the sub-valve block to be attached or detached as needed, providing versatility in system configuration and simplifying oil passage routing for different operating conditions.
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
Reduces the size of the main valve block and allows for flexible integration of a pilot pump, maintaining consistent primary pilot pressure while simplifying the oil passage configuration.
Implementation Method 1
a primary pressure generating valve capable of generating a primary pilot pressure by reducing a pressure of the pilot fluid guided through the first introduction passage
Data Source
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AI summary
A fluid pressure control device (100) includes a main valve block (1) and a sub-valve block (2), the main valve block (1) includes a supply passage (20), a first introduction passage (25), a first primary pressure passage (26), and a first drain passage (27), the first introduction passage (25), the first primary pressure passage (26), and the first drain passage (27) are formed to open to an outer surface (1a) of the main valve block (1), and in the sub-valve block (2), openings (2a, 2b, 2c) capable of respectively communicating with the first introduction passage (25), the first primary pressure passage (26), and the first drain passage (27) are formed in an outer surface (2d), and a primary pressure generating valve (30) capable of generating a primary pilot pressure and guiding the primary pilot pressure to the first primary pressure passage (26) is provided.