Sealed Linear Encoder Tensioned Sealing Lip
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Solution Overview
Problem
Sealed encoders operating in machine tool environments face challenges due to contaminants like lubricating oil, which degrade the effectiveness of the sealing lip over time, allowing contaminants to enter the protective housing and interfere with the encoder's operation.
Innovation Solution
The sealed linear encoder apparatus employs an elongate sealing lip with a sealing portion held in tension along its length, reducing deformation and maintaining the integrity of the seal against contaminants, using materials like elastomers and embedded elements to enhance the sealing configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing lip is used to protect the encoder from contaminants, then the encoder is protected from contamination, but the sealing lip deforms over time allowing contaminants to enter
Solution Approach 1:
The patent applies parameter changes by pre-tensioning the sealing lip to a specific force (e.g., 0.5-2.0 N/mm) and configuring it with a predetermined curvature radius (e.g., 5-50 mm) to optimize its sealing performance and durability against contaminant exposure
2Duration of action of moving object
If the sealing lip is made more robust to resist deformation, then sealing longevity improves, but the device complexity increases
Solution Approach 1:
The patent employs a flexible sealing lip made of elastomeric material that can be pre-configured with a specific curvature and pre-tensioned to maintain sealing effectiveness without requiring complex rigid structures or additional components
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 approach significantly increases the longevity of the sealing lip, maintaining the physical barrier against contaminants for a longer duration, preventing buckling and ensuring the encoder's reliability in contaminated environments.
Implementation Method 1
at least a sealing portion of the sealing lip is held in tension along its length
Implementation Method 2
The elongate sealing lip may be curved. The elongate sealing lip may comprise an elastomeric material
Data Source
AI summary
A sealed linear encoder apparatus provides a measure of relative displacement of two relatively movable members. The sealed linear encoder apparatus includes at least one elongate sealing lip wherein at least a sealing portion of the elongate sealing lip is held in tension along its length.