Protective Ring Engagement Structure for Stable Seal Positioning
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Solution Overview
Problem
Conventional sealing devices with protective rings are prone to displacement under greater-than-expected external forces due to inadequate retention mechanisms.
Innovation Solution
The sealing device incorporates an annular reinforcement ring with an elastic portion and a protective ring featuring an engagement portion with a recessed groove and upstanding wall on its outer peripheral surface, which engages with the inner periphery of the reinforcement ring to prevent displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the protective ring is held on the inner periphery side of the tubular portion with a repulsive force of rubber generated as the elastic portion is squashed, then the protective ring can be retained without complex fastening mechanisms, but the protective ring may be displaced from a predetermined position when a greater-than-expected external force is applied
Solution Approach 1:
The reinforcement ring is divided into a tubular portion and a disk portion, creating distinct functional zones. The engagement portion is specifically formed on the disk portion to provide a dedicated engagement interface, separating the retention function from the reinforcement function and enabling more reliable positioning.
Solution Approach 2:
The engagement portion extends in the axial direction (perpendicular to the radial squashing force) to engage with the elastic portion. This adds an axial dimension to the retention mechanism, complementing the radial elastic force and preventing displacement in the axial direction when external forces are applied.
2Object-affected harmful factors
If the protective ring is fitted around the lip portion from the exterior side to prevent collision of foreign matter, then the lip portion is protected from external damage, but the protective ring lacks a secure engagement mechanism to prevent displacement under external forces
Solution Approach 1:
The protective ring and reinforcement ring are merged into a single integrated component. The engagement portion on the reinforcement ring (which is part of the protective ring assembly) engages with the elastic portion of the reinforcement ring, combining the protective function with a secure retention mechanism in one structure.
Solution Approach 2:
The sealing device combines metal components (protective ring, reinforcement ring) with elastic material (elastic portion). The composite structure leverages the strength and rigidity of metal for protection while utilizing the elasticity of rubber for secure retention, creating a reliable position-stable assembly that resists displacement under external forces.
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
This configuration effectively suppresses the displacement of the protective ring by providing a secure engagement mechanism that resists external forces, ensuring the ring remains in its predetermined position.
Implementation Method 1
the protective ring is held on the inner periphery side of the tubular portion with a repulsive force (i.e., a frictional force) of rubber generated as the elastic portion provided on the inner periphery side of the tubular portion is squashed
Implementation Method 2
an annular elastic portion around the axis, the annular elastic portion being attached to the reinforcement ring, being formed of an elastic material
Data Source
AI summary
Provided is a sealing device that can suppress the displacement of a protective ring. A sealing device includes an annular reinforcement ring around an axis x; an annular elastic portion around the axis x that is attached to the reinforcement ring, is formed of an elastic material, and includes a lip portion; and an annular protective ring around the axis x that is adapted to be fitted to an inner periphery side d the reinforcement ring. The reinforcement ring includes a reinforcement ring tubular portion formed in a tubular shape around the axis x. The protective ring includes a protective ring tubular portion formed in a tubular shape around the axis x, and an engagement portion that is provided on an outer peripheral surface of the protective ring tubular portion and is adapted to engage with the inner periphery side d of the reinforcement ring.