Compression Limiter Retention Features
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Solution Overview
Problem
Existing compression limiters for automotive assemblies often require additional processing steps and increased manufacturing time and cost due to retention features that secure them within plastic components, which can lead to deformation or creep under load.
Innovation Solution
A compression limiter design featuring outwardly projecting retainers with planar and undercut surfaces that secure the limiter within the plastic component, manufactured using a powder metal process that shapes the outer and inner surfaces simultaneously, allowing for secure retention without additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retention features are added to compression limiters to secure them within plastic components, then reliability is improved, but device complexity and manufacturing time increase
Solution Approach 1:
The patent combines the compression limiter body and retention features into a single integrated component. The retention features (flanges, ribs, or lugs) are formed as integral parts of the compression limiter during the same manufacturing process, eliminating the need for separate retention components and reducing assembly steps while maintaining secure retention within the plastic component.
Solution Approach 2:
The compression limiter is designed to perform multiple functions simultaneously: it provides compression limiting, structural support, and retention security through integrated features. The same component that limits compression also incorporates retention elements that secure it within the plastic component, reducing the need for additional specialized parts.
2Reliability
If retention features are added to compression limiters to secure them within plastic components, then reliability is improved, but manufacturing time increases
Solution Approach 1:
The manufacturing process combines the formation of the compression limiter body and retention features into a single operation. Whether through injection molding, compression molding, or other forming processes, both the main body and retention features (flanges, ribs, lugs) are created simultaneously in one tooling cycle, eliminating sequential processing steps and reducing overall manufacturing time.
Solution Approach 2:
The retention features are formed during the initial manufacturing process rather than being added as post-processing steps. The molding tools are designed to create retention features as part of the primary forming operation, so no additional machining, attachment, or assembly operations are required after the main component is formed.
3Reliability
If retention features are added to compression limiters to secure them within plastic components, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates retention features into the compression limiter body, allowing both to be manufactured in a single process step. This eliminates the need for separate manufacturing operations, tooling, and assembly steps for retention components, thereby reducing overall manufacturing cost despite the added functionality.
Solution Approach 2:
The compression limiter serves multiple purposes: compression limitation, structural reinforcement, and retention security. By designing a single component that performs all these functions, the patent eliminates the need for multiple separate parts, reducing material costs, manufacturing costs, and assembly costs while improving reliability.
Data Source
AI summary
A compression limiter is disclosed that comprises an upper surface and a lower surface. The compression limiter further comprises an inner surface that defines a passageway configured to accommodate a fastener and an outer surface configured to engage a structure in which the compression limiter is placed. A first retainer projects outwardly from the outer surface and includes a first retention surface that has at least a planar portion. The first retainer further includes an undercut surface disposed inwardly from the first retention surface so as to create a corner extending in a direction with at least a component perpendicular to the longitudinal direction. A method of forming the compression limiter is also disclosed.