Gerotor Spool Groove Structure for High-Pressure Leakage Control
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Solution Overview
Problem
Hydraulic machines, particularly those with gerotor arrangements, face issues with leakage, deformation, and wear due to high pressures, which affect the efficient routing of hydraulic fluid.
Innovation Solution
A hydraulic machine design featuring a cylindrical spool with radially inward extending circumferential and axial grooves, where the bottom surfaces of the grooves are configured to provide increased radial thickness and resistance to deformation, minimizing leakage and facilitating efficient fluid flow and pump operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spool designs are used in high pressure hydraulic machines, then the structure is simpler, but deformation and leakage increase
Solution Approach 1:
The spool features circumferential grooves with bottom surfaces that have varying radial thickness - thinner at the ends and thicker in the intermediate regions. This local variation in geometry provides increased resistance to deformation in the critical intermediate regions where pressure effects are most pronounced, while maintaining simplicity in other areas.
Solution Approach 2:
The invention addresses the deformation problem by adding a radial dimension variation to the groove bottom surfaces. Instead of uniform cylindrical grooves, the bottom surfaces extend radially to different distances from the spool axis, creating a three-dimensional structure that resists high pressure deformation without requiring overall structural complexity.
2Reliability
If thicker spool material is used to resist deformation, then leakage decreases, but manufacturing complexity increases
Solution Approach 1:
The groove bottom surfaces are configured with varying radial thickness, providing thicker material (and thus better leakage resistance) in the intermediate regions between groove ends, while maintaining thinner material at the groove ends where pressure effects are less critical. This localized approach to material distribution achieves leakage prevention without uniform complexity throughout the entire spool structure.
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 design enhances resistance to deformation and minimizes fluid leakage, ensuring efficient operation and accurate control of hydraulic fluid flow, even under high pressures.
Implementation Method 1
Hydraulic machines often operate by selectively routing the flow of hydraulic fluid within the machine. In many situations the flow of hydraulic fluid within the machine is at high pressures.
Implementation Method 2
the bottom surface which radially inwardly bounds the first circumferential groove is configured so that in transverse diametric cross section the bottom surface is positioned further radially outward from the axis of the spool with increased axial proximity to the first axial grooves
Data Source
AI summary
A hydraulic machine (1) such as a pump or motor includes a working section (6) such as a gerotor. A spool (3) is rotatable about an axis (4) within a bore of the machine housing (2). The spool includes hydraulic fluid directing passages that enable operation of the machine. The spool includes first and second axially spaced apart circumferential grooves (14, 15). A plurality of first axial grooves (16) extend in intersecting relation with the first circumferential groove and a plurality of second axial grooves (17) extend in intersecting relation with the second circumferential groove. The first and second axial grooves are arranged in alternating relation about the circumference of the spool. The circumferential grooves are bounded radially inwardly by respective bottom walls (19, 22) that have a greater radial distance from the axis with axial proximity to the intersecting grooves.