Integrated Servo Spool Assembly for Stable Pressure Regulation
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Solution Overview
Problem
The existing servo regulator in JP2009-243435A experiences instability due to the separate first and second spools, leading to uneven flowrates between the pressure chambers and tank, and integrating these spools requires enlarging the feedback spring, altering its characteristics and control performance.
Innovation Solution
A servo regulator design with a spool that integrates the first and second spool functions, featuring detachable support portions for the biasing spring, allowing for assembly without deforming the spring and maintaining desired control characteristics, thus stabilizing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate first spool and second spool are used, then each spool can be independently controlled, but the operation stability deteriorates due to inconsistent passage opening sizes
Solution Approach 1:
The patent merges the first spool and second spool into a single integrated spool structure. This integrated spool has a first passage opening and a second passage opening with substantially the same size, ensuring consistent flow characteristics. The merging eliminates the instability caused by separate spools having different opening sizes while maintaining independent control capability through the single spool's ability to regulate both pressure chambers simultaneously.
2Reliability
If integrated spool is used, then operation stability is improved, but the feedback spring inner diameter must be enlarged which alters spring characteristics
Solution Approach 1:
The patent resolves the space conflict by changing the dimensional arrangement of support portions. Instead of requiring a large inner diameter feedback spring, the invention provides support portions at different axial positions along the spool. This allows the feedback spring to maintain its original dimensions and characteristics while still providing proper support for the integrated spool structure.
3Ease of manufacture
If feedback spring is deformed to fit integrated spool, then assembly is simplified, but control characteristic deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-positioning support portions on the integrated spool at appropriate locations before assembly. These support portions are strategically placed to provide immediate support for the feedback spring without requiring deformation or modification of the spring. This preliminary arrangement ensures both easy assembly and maintenance of the feedback spring's original control characteristics.
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
The integrated spool design enhances operational stability by ensuring consistent flowrates and maintaining desired control characteristics, reducing fluctuations in the servo regulator's performance.
Implementation Method 1
a spool configured to control pressures in the first pressure chamber and the second pressure chamber by moving by a solenoid
Implementation Method 2
a biasing member provided on an outer periphery of the spool and configured to bias the spool against a thrust of the solenoid
Data Source
AI summary
A servo regulator includes servo piston, a first pressure chamber and a second pressure chamber, a spool, a biasing member provided on an outer periphery of the spool and configured to bias the spool, a first support portion configured to support one end portion of the biasing member when the spool is moved to a first direction where the pressure in the first pressure chamber is raised, and a second support portion configured to support other end portion of the biasing member when the spool is moved to a second direction where the pressure in the second pressure chamber is raised, wherein at least one of the first support portion and the second support portion is detachably provided on the spool.