Fluid Pressure Control Device External Output Port
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Solution Overview
Problem
Existing fluid pressure control devices in work machines, such as those described in JP2002-181008A, limit the use of working oil from the first circuit system to only joining with a specific actuator in the second circuit system, preventing its utilization for other purposes.
Innovation Solution
The fluid pressure control device incorporates an intermediate cut valve and external output port, allowing working oil from the first circuit system to be externally supplied and used for purposes beyond joining with a specific actuator in the second circuit system, through a branching passage and external input port, enabling its use in other actuators or circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the joining passage is provided inside the valve block to connect the first circuit system with the second circuit system, then the communication between circuits is established, but the working oil from the first circuit system cannot be used for purposes other than joining into a certain actuator of the second circuit system
Solution Approach 1:
The valve block is segmented into multiple independent passage systems: a first passage for connecting the first circuit system, a second passage for connecting the second circuit system, and a third passage for external output. This segmentation allows working oil to be directed to multiple destinations independently, enabling versatile usage while maintaining a modular valve block structure.
Solution Approach 2:
The first passage is designed to serve multiple functions: it can connect the first circuit system with the second circuit system for actuator joining, and simultaneously provide external output for other purposes. This multi-functionality is achieved by configuring the passage to have both an internal connection path and an external output port, eliminating the need for separate dedicated passages for each function.
2Adaptability or versatility
If separate communication passages are provided for different functions, then the working oil can be used for multiple purposes, but the complexity and size of the valve block increases
Solution Approach 1:
Multiple functions are merged into a single integrated passage system. The first passage combines the function of internal circuit connection and external output capability within one continuous flow path. This merging reduces the total number of separate passages needed, thereby reducing the overall valve block volume while maintaining full functionality.
Solution Approach 2:
The first passage is designed as a universal passage that can serve multiple purposes: internal circuit communication and external output. By making this passage multi-functional rather than providing separate dedicated passages for each function, the valve block size is minimized while achieving versatile working oil usage.
Data Source
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AI summary
A fluid pressure control device (100) includes a first circuit system (10) having a first pump (P1) and a first control valve (121-125). The first circuit system (10) includes an intermediate cut valve (40) provided downstream of the first control valve (121-125) in a first intermediate passage (11) and which connects and disconnects a connection between the first intermediate passage (11) and the tank T, and an external output port (64) communicating at a part downstream of the first control valve (121-125) in the first intermediate passage (11) and upstream of the intermediate cut valve (40), the external output port (64) being capable of externally supplying working fluid discharged from the first pump (P1).