One-Piece Plastic Ball Joint Assembly for Pull-Out Resistance
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Solution Overview
Problem
Existing ball joint assemblies in vehicular applications are complex, heavy, and prone to high pull-out forces, requiring multiple components and materials like steel, which increases weight, cost, and complexity, while offering limited resistance to pull-out forces.
Innovation Solution
A simplified ball joint assembly using a one-piece engineering plastic bearing with a frustospherical socket cavity and integral bearing cover, featuring a tapered lead-in and slots for enhanced retention, reducing the number of components and improving resistance to pull-out forces by using a snap ring retainer and elastomeric boot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional multi-component ball joint assemblies are used, then strength and reliability are maintained, but weight and device complexity increase
Solution Approach 1:
The patent combines multiple traditional components (bearing, cover plate, retainers) into a single integrated plastic bearing assembly. The bearing itself forms the housing structure, eliminating the need for separate cover plates and retaining members, thus reducing component count from 6+ to 1 while maintaining structural integrity and strength.
Solution Approach 2:
The invention uses engineered plastic materials with high strength-to-weight ratios to replace traditional metal components. The plastic bearing assembly achieves comparable strength to steel constructions while significantly reducing weight, enabling the consolidation of multiple metal parts into a single lightweight plastic component.
2Ease of manufacture
If traditional multi-component ball joint assemblies are used, then reliability is maintained, but manufacturing cost and complexity increase
Solution Approach 1:
The patent integrates the bearing, cover plate, and retaining functions into a single molded plastic component. This eliminates multiple assembly steps including bearing insertion, cover plate attachment, and retainer installation, simplifying manufacturing to a single molding operation and significantly improving production efficiency.
Solution Approach 2:
The plastic bearing assembly is pre-formed as a complete integrated unit through molding, with all structural features (bearing surfaces, housing walls, retaining structures) created in a single manufacturing step. This preliminary formation of the complete assembly eliminates subsequent assembly operations and reduces manufacturing complexity.
3Strength
If traditional ball joint designs are used, then structural strength is maintained, but resistance to pull-out forces is limited
Solution Approach 1:
The patent integrates the bearing, cover plate, and retaining functions into a single integrated plastic bearing assembly. The bearing itself forms the housing structure, eliminating the need for separate cover plates and retaining members, thus reducing component count from 6+ to 1 while maintaining structural integrity and strength.
Solution Approach 2:
The invention uses engineered plastic materials with high strength-to-weight ratios to replace traditional metal components. The plastic bearing assembly achieves comparable strength to steel constructions while significantly reducing weight, enabling the consolidation of multiple metal parts into a single lightweight plastic component.
Data Source
AI summary
A ball joint assembly includes a ball stud, a cylindrical bearing, a housing and a retainer. The bearing has an upper end, a lower end, a exterior sidewall, an upper flange located between the upper end and a ring groove formed in the exterior sidewall, a lower flange proximate the lower end and extending outwardly and a socket cavity that opens toward the lower end. A ball portion of the ball stud is retained within the socket cavity. The bearing is secured within a bore within the housing by virtue of the working of the lower flange and the upper flange and retainer located in the ring groove. The ball joint assembly is able to resist a pull-out force of up to 1200 lbs. It may also be sealed by incorporation of a dust boot which extends between the housing and a stud portion of the ball stud.