One-Part Thermoplastic Seal for Linear Motion
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Solution Overview
Problem
Existing seals for linearly moving parts face challenges in achieving high temperature resistance with low production expenditure, as they often require additional parts for groove closure or have high production costs for closed grooves, and lack efficient sealing solutions.
Innovation Solution
A seal featuring a one-part high-temperature-resistant thermoplastic sealing ring inserted into a circumferential groove on either the outer or inner circumference of circular cylindrical parts, with the groove closed without additional parts, enhancing temperature resistance and reducing construction costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed groove is used to accommodate the sealing ring, then the sealing ring can be securely held, but the production expenditure increases and the groove requires additional parts for closure
Solution Approach 1:
The sealing ring is designed as a one-piece component that integrates both the sealing function and the groove-closing function. The ring is inserted into an open groove and simultaneously closes the groove laterally, eliminating the need for separate holding rings or locking rings. This merging of functions reduces the number of parts and simplifies production while maintaining secure retention of the sealing ring.
2Ease of operation
If additional parts are used to close the groove laterally, then the sealing ring is securely retained, but the device complexity and production costs increase
Solution Approach 1:
The sealing ring serves dual purposes: providing sealing and closing the groove. This eliminates the need for additional holding rings, locking rings, or other closure components, thereby reducing device complexity and the total number of parts while maintaining secure retention.
Solution Approach 2:
The sealing ring is designed as a multi-functional component that simultaneously provides sealing, structural support, and groove closure. This universal design allows a single part to perform multiple functions that traditionally required separate components, simplifying the overall assembly.
3Reliability
If elastomer sealing rings are used in closed grooves, then sealing is effective, but the temperature resistance is limited due to elasticity requirements
Solution Approach 1:
The sealing ring is made from high-temperature-resistant thermoplastic plastics materials such as polyphenylene sulfide (PPS), polyether ether ketone (PEEK), or polyimide (PI), which can withstand temperatures up to 200°C or higher. These materials maintain their mechanical properties and sealing effectiveness at elevated temperatures where traditional elastomers would degrade.
Solution Approach 2:
The sealing ring may be constructed as a composite structure combining thermoplastic plastics with reinforcing fibers (such as glass or carbon fibers) or other materials to enhance both temperature resistance and mechanical strength while maintaining sealing functionality.
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 solution provides a cost-effective, high-temperature-resistant seal for linearly moving parts with improved sealing properties and reduced production complexity, capable of sealing high pressures up to 180°C, and is applicable in various applications such as hydraulic cylinders and self-locking parking brakes.
Implementation Method 1
the sealing ring consists of a high-temperature-resistant thermoplastic plastics material... capable of sealing high pressures up to 180°C
Implementation Method 2
high-temperature-resistant thermoplastic plastics material... capable of sealing high pressures up to 180°C
Data Source
AI summary
A seal between an outer part and a circular cylindrical inner part, which is accommodated within the outer part at least in sections, includes a sealing ring having a groove portion and consisting of high-temperature-resistant thermoplastic plastics material. The outer part and the inner part are movable in a linear manner in relation to each other. A circumferential groove, into which the groove portion of the sealing ring is inserted at least in sections, is realized on an inner circumference of the outer part or on an outer circumference of the inner part. The sealing ring is in one part, and the groove is closed.