Sealing Ring Geometry for Accurate Parting and Low Sliding Resistance
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Solution Overview
Problem
Existing sealing devices with annular inner peripheral convex portions face challenges in achieving high positioning accuracy during parting operations and exhibit high sliding resistance, which affects manufacturing efficiency and durability.
Innovation Solution
The method involves molding an elastomeric cylindrical body with alternating cylindrical and annular surface portions on both the outer and inner peripheries, allowing for easier parting along cylindrical surface portions and enabling both outer and inner peripheral sliding usage, thereby improving positioning accuracy and reducing sliding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a parting operation is conducted on a molded body with annular inner peripheral convex portions, then manufacturing efficiency is improved, but positioning accuracy of the parting operation deteriorates
Solution Approach 1:
The invention segments the peripheral surface of the molded body by providing both outer peripheral convex portions and inner peripheral convex portions. This segmentation creates multiple distinct parting positions, allowing the parting operation to be accurately positioned at the outer peripheral convex portions while maintaining the structural integrity and sealing function provided by the inner peripheral convex portions.
Solution Approach 2:
The outer peripheral convex portions serve as intermediary features that facilitate the parting operation. These convex portions provide clear positioning references for the parting tool, acting as a mediator between the molded body structure and the parting process, thereby improving positioning accuracy without compromising manufacturing efficiency.
2Reliability
If the main body portion of the sealing device is constrained in the fitting groove, then sealing function is improved, but sliding resistance increases
Solution Approach 1:
The invention applies local quality by providing cylindrical surface portions at specific locations between the convex portions. These cylindrical surface portions have different friction characteristics compared to the convex portions, creating zones of reduced friction that facilitate sliding while maintaining sealing contact at the convex portions.
Solution Approach 2:
The alternating arrangement of convex and cylindrical surface portions creates a dynamic interaction during sliding. The sealing device can deform and adapt locally, with the cylindrical surface portions allowing easier deformation and movement, thereby reducing sliding resistance while maintaining overall sealing effectiveness.
Data Source
AI summary
A method for manufacturing a sealing device to improve the positioning accuracy of a parting operation while also improving manufacturing efficiency. The method includes molding an elastomeric cylindrical molded body (100a) with a plurality of cylindrical surface portions (130) and a plurality of annular outer peripheral convex portions (110) arranged alternately on an outer peripheral side thereof, and further provided with a plurality of cylindrical surface portions and a plurality of annular inner peripheral convex portions arranged alternately on an inner peripheral side thereof. The cylindrical surface portions on the outer peripheral side and the cylindrical surface portions on the inner peripheral side, as well as the outer peripheral convex portions and the inner peripheral convex portions are provided so as to be at the same positions in the axial direction.