Split Valve Housing for Hydraulic Pressure Stability
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Solution Overview
Problem
Conventional multiple valve devices in hydraulic excavators experience pressure fluctuations between hydraulic pumps due to differences in pipeline lengths, leading to inconsistent delivery pressures.
Innovation Solution
A multiple valve device with a split valve housing configuration, where the relief valve is positioned closer to the joining surface between two hydraulic pumps, allowing for balanced pressure regulation by distributing the relief valve's function across both housing blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the relief valve is positioned far from the joining surface, then it can accommodate more spool sliding bores in one housing block, but the pipeline length difference between hydraulic pumps increases causing pressure fluctuations
Solution Approach 1:
The valve housing is divided into two separate housing blocks (first housing block and second housing block) that are joined together. This segmentation allows the relief valve to be positioned on one housing block closer to the joining surface, reducing the pipeline length difference between the two hydraulic pumps and suppressing pressure fluctuations, while still accommodating multiple spool sliding bores distributed across both housing blocks.
2Strength
If the valve housing is made as a single mono-block, then structural integrity is improved, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The valve housing is divided into two housing blocks that are manufactured separately and then joined together using joining portions. This segmentation simplifies the manufacturing process for each individual housing block while maintaining the structural integrity of the complete valve housing through the joining mechanism.
3Reliability
If the relief valve is positioned closer to the joining surface, then pressure fluctuations are suppressed, but the housing dimensions may need to be reduced
Solution Approach 1:
The spool sliding bores are arranged in a three-dimensional configuration within the housing blocks, utilizing spatial distribution in multiple dimensions. This allows the relief valve to be positioned close to the joining surface for pressure stability while the housing blocks maintain sufficient volume through efficient three-dimensional space utilization rather than requiring larger linear dimensions.
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 configuration effectively suppresses pressure fluctuations between hydraulic pumps, ensuring consistent delivery pressures and reducing the need for increased housing dimensions, thereby improving sealing performance and assembly efficiency.
Implementation Method 1
a relief valve for suppressing a maximum pressure in each of the oil passage to a predetermined set pressure or less is provided in one of the first and second housing blocks
Data Source
AI summary
A valve housing of a multiple valve device is formed by being split into two parts, that is, a first housing block and a second housing block abutting against and separated away from each other at positions of facing joining surfaces. Three or more spool sliding bores are provided on the first housing block forming a three-dimensional structure. The other spool sliding bores are provided on the second housing block forming a three-dimensional structure. A relief valve for suppressing maximum pressures in a plurality of oil passages to a predetermined set pressure or less is provided on one of the first and second housing blocks. This relief valve is arranged at a position closer to the joining surfaces than each of the spool sliding bores provided in the one of housing blocks.