Seal Lip Positioning Structure for Concentric Sealing Alignment
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Solution Overview
Problem
Conventional sealing structures face issues with accurate positioning due to dimensional constraints, leading to eccentric arrangement and uneven contact, which affects sealing effectiveness.
Innovation Solution
A sealing structure featuring a first seal lip with interference contact to the inner and first end walls, generating radial and axial reaction forces to position the support ring concentrically within the attachment space, ensuring accurate radial and axial alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer peripheral surface of the lip seal does not contact the outer peripheral wall due to dimensional constraints, then the lip seal can be installed with tolerance, but the positioning accuracy and sealing effectiveness deteriorate due to eccentric arrangement
Solution Approach 1:
The patent introduces an intermediary positioning mechanism consisting of the seal-lip end contacting both the inner peripheral wall and the first end wall. This intermediary contact arrangement mediates between the outer peripheral surface and the outer peripheral wall, providing accurate positioning without requiring direct contact between them, thus resolving the contradiction between installation tolerance and positioning accuracy
Solution Approach 2:
The patent transitions from relying solely on radial contact (outer peripheral surface to outer peripheral wall) to utilizing axial dimension as well (seal-lip end to first end wall). By adding this dimensional aspect, the system achieves accurate positioning in both radial and axial directions, overcoming the limitation of single-dimensional positioning
2Manufacturing precision
If the seal-lip end contacts both the inner peripheral wall and the first end wall with interference, then positioning accuracy improves, but the structural complexity increases
Solution Approach 1:
The seal-lip end structure serves multiple functions simultaneously: it provides sealing contact with the inner peripheral wall, axial positioning against the first end wall, and generates reaction forces for radial positioning. This self-service approach achieves accurate positioning without requiring additional separate positioning components, thus improving positioning accuracy while avoiding excessive structural complexity
Solution Approach 2:
The seal-lip end is designed as a multi-functional element that performs sealing, radial positioning, axial positioning, and force generation functions. By consolidating multiple functions into a single component, the system achieves high positioning accuracy without proportionally increasing structural complexity
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 sealing device is accurately positioned in both radial and axial directions, enhancing sealing effectiveness and resistance to pressure, while improving workability and maintaining stability under fluid pressure.
Implementation Method 1
the first seal-lip end has a certain amount of interference with the inner peripheral wall and the first end wall so that its radial reaction force radially presses the support ring outward
Implementation Method 2
the first seal-lip end has a certain amount of interference with the inner peripheral wall and the first end wall so that its axial reaction force presses the support ring toward the second end wall
Data Source
AI summary
A sealing structure includes a sealing device including a first seal lip having a first seal-lip end, and a support ring that supports the first seal lip; and a plurality of members that define an attachment space into which the sealing device is attached, the members including an inner peripheral wall arranged on the inner periphery side of the sealing device, a first end wall arranged on one axial end of the sealing device, and a second end wall arranged on another axial end of the sealing device. The first seal-lip end has a certain amount of interference with the inner peripheral wall and the first end wall so that its radial reaction force radially presses the support ring outward and its axial reaction force presses the support ring toward the second end wall.