Integrated Piston Packing for Transverse Load and Sealing
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Solution Overview
Problem
Conventional fluid pressure apparatuses with both packing and wear rings on the piston have a complex structure and increased size due to multiple parts, which complicates sealing and increases the risk of piston misalignment and excessive deformation.
Innovation Solution
A fluid pressure apparatus with a ring-shaped support ring made of low-friction material and an elastic seal member, where the support ring is integrated with side and bottom walls, providing equivalent wear ring functionality without the need for a separate wear ring, thus simplifying the structure and reducing axial size while enhancing strength against transverse loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both packing and wear ring are installed on the piston, then sealing function and wear protection are improved, but device complexity and piston size increase
Solution Approach 1:
The patent combines the wear ring and packing into a single integrated packing structure. The packing includes a wear-resistant outer circumferential surface that contacts the slide hole, eliminating the need for a separate wear ring. This merging reduces the number of parts and simplifies the sealing section structure while maintaining both sealing and wear protection functions.
Solution Approach 2:
The packing is designed to perform multiple functions simultaneously: it provides sealing between the piston and slide hole, offers wear protection through its wear-resistant material, and prevents excessive piston deformation. This multi-functional design eliminates the need for separate components and reduces overall system complexity.
2Reliability
If both packing and wear ring are installed on the piston, then sealing function and wear protection are improved, but piston size in axial direction increases
Solution Approach 1:
The patent combines the wear ring and packing into a single integrated packing structure. The packing includes a wear-resistant outer circumferential surface that contacts the slide hole, eliminating the need for a separate wear ring. This merging reduces the number of parts and simplifies the sealing section structure while maintaining both sealing and wear protection functions.
Solution Approach 2:
The invention transitions from a multi-component axial arrangement to a radially-integrated single-component design. By providing wear protection and sealing functions in the radial direction through the integrated packing structure, the need for additional axial space for separate components is eliminated.
3Reliability
If packing is pressed by slide hole inner surface, then sealing is effected, but excessive deformation occurs under transverse load
Solution Approach 1:
The packing is designed with different material properties in different regions: the outer circumferential surface has wear-resistant properties for contacting the slide hole, while the inner regions maintain elasticity for sealing. This localized quality distribution allows the packing to resist transverse loads while maintaining sealing effectiveness.
Solution Approach 2:
The packing is made from a composite material or multi-layer structure that combines wear-resistant properties with elastic sealing properties. This composite construction enables the packing to simultaneously resist transverse loads through its wear-resistant outer surface while maintaining sealing through its elastic inner 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 integrated support ring structure prevents piston contact with the slide hole inner surface, regulates transverse displacement, and maintains sealing efficiency, reducing the need for additional wear rings and minimizing size increase, while maintaining effective sealing and strength.
Implementation Method 1
a ring-shaped seal member made of an elastic material and which is installed in the seal installation groove, an outer circumference of the seal member protruding outwardly from the support ring and contacting with an inner circumferential surface of the slide hole
Implementation Method 2
a ring-shaped support ring made of a low-friction material and having an annular seal installation groove on an outer circumference side
Data Source
AI summary
A fluid pressure apparatus includes a piston, and a packing provided on an outer circumference of the piston. The packing includes a support ring made of a low-friction material, and a ring-shaped seal member mounted to the support ring. When at least a certain amount of transverse load acts on the piston, an outer circumferential surface of the support ring abuts against an inner circumferential surface of the slide hole, whereby the piston is prevented from contacting with the inner circumferential surface of the slide hole.