Composite Ball Socket Bearing for Fracture-Resistant Stud Insertion
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Solution Overview
Problem
Existing ball joint bearings made as monolithic pieces face challenges in withstanding the insertion of a ball stud without fracturing, as they lack the necessary combination of elasticity and strength to resist operational loads.
Innovation Solution
A ball socket assembly with a bearing made from a plastic material comprising 8-12 mass percent polytetrafluoroethylene, 2-6 mass percent carbon fibers, and the remainder acetal, featuring a curved surface and radially deflectable fingers to accommodate the ball stud, combined with a heat-treated 5140 steel ball stud for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bearing is made as a monolithic piece of plastic material, then the bearing can be manufactured as a single integrated component, but the bearing may fracture during insertion of the ball stud due to insufficient elasticity
Solution Approach 1:
The bearing is made from a composite plastic material containing 8-12 mass percent polytetrafluoroethylene (PTFE), 2-6 mass percent carbon fibers, and the remainder acetal. The PTFE provides elasticity and flexibility to prevent fracture during insertion, while the carbon fibers reinforce the material to maintain structural strength and load-bearing capability under operational conditions.
2Ease of operation
If the bearing material has high elasticity to allow ball stud insertion, then the bearing can deform during insertion, but the bearing may lack sufficient strength to resist operational loads
Solution Approach 1:
The composite plastic material combines PTFE (providing elasticity for insertion), carbon fibers (providing tensile strength and structural reinforcement), and acetal (providing base structural properties and load-bearing capacity). This combination achieves both flexibility during insertion and sufficient strength under operational loads.
Solution Approach 2:
The material composition is precisely controlled with specific ranges: 8-12 mass percent PTFE for optimal elasticity, 2-6 mass percent carbon fibers for adequate reinforcement, and the remainder acetal for structural integrity. These parameter specifications ensure the bearing achieves the right balance between flexibility and strength.
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 optimal elasticity for smooth insertion and sufficient strength to resist operational loads, ensuring the bearing's flexibility and durability, outperforming conventional ball socket assemblies in terms of performance and longevity.
Implementation Method 1
The plastic material of the single piece bearing provides the bearing with an optimal combination of elasticity, thereby allowing the bearing to flex while inserting the ball portion of the ball stud into the ball cavity
Implementation Method 2
at least a portion of the ball stud is heat treated
Data Source
AI summary
The ball socket assembly includes a housing with an inner bore, and a bearing is received in the inner bore. The bearing is made as a monolithic piece of a plastic material and has a curved bearing surface which surrounds a ball cavity. The ball socket assembly also includes a ball stud with a ball portion and a shank portion. The ball portion is received in the ball cavity of the bearing and has an equator. The curved bearing surface of the bearing is in slidable contact with the ball portion on opposite axial sides of the equator. The plastic material of the bearing comprises 8-12 mass percent polytetrafluoroethylene, 2-6 mass percent carbon fibers, and the remainder acetal.