Ball Socket Resilient Tabs Shank Contact Pull-Out
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Solution Overview
Problem
Conventional ball joints in automotive lamp assemblies are prone to accidental pull-out due to flexible retention tabs, especially under vibration, which can lead to operational failure, and existing solutions either compromise insertion ease or material durability.
Innovation Solution
A ball socket design with resilient tabs that contact the ball stud at a location towards the shank, rather than the tangent point, providing dual moment forces and increased resistance to pull-out while maintaining ease of insertion, using a configuration with a journal area and transition surface to distribute forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional ball joints use flexible retention tabs to retain the ball stud, then the ball stud can be easily inserted into the socket, but the ball stud may be pulled out accidentally under vibration or heavy load
Solution Approach 1:
The patent changes the contact location parameter from the tangent point to a point toward the shank of the ball stud. This parameter change creates dual moment forces that significantly increase pull-out resistance while maintaining ease of insertion, as the resilient tabs still deflect to allow insertion but resist pull-out more effectively
Solution Approach 2:
The patent utilizes the spherical geometry of the ball stud and introduces curved contact surfaces including a journal area and transition surface. The curved transition surface between the journal area and the contact point optimizes force distribution and enhances the moment arm for resisting pull-out forces
2Reliability
If the retention tabs are made less flexible to prevent pull-out, then pull-out resistance increases, but insertion becomes difficult and tabs may break off
Solution Approach 1:
By changing the contact location parameter toward the shank and introducing the transition surface geometry, the patent achieves high pull-out resistance with tabs of moderate flexibility. The transition surface distributes insertion forces across a larger area, preventing tab breakage while the dual moment forces provide superior pull-out resistance
Solution Approach 2:
The transition surface is designed to guide the ball stud during insertion, preliminarily distributing the insertion force before the ball stud reaches the final contact position. This preliminary force distribution prevents concentrated stress on the tabs during insertion
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 design significantly enhances pull-out resistance while allowing for easy insertion, achieving higher pull-out forces without sacrificing insertion ease, even with plastic ball studs, and is cost-effective, addressing the limitations of prior art ball joints.
Implementation Method 1
providing dual moment forces and increased resistance to pull-out
Implementation Method 2
The resilient tabs 130 elastically deform when the ball stud 120 is inserted into the socket 110
Implementation Method 3
using a configuration with a journal area and transition surface to distribute forces effectively
Data Source
AI summary
A ball socket for connection with a ball stud resists accidental pull-out of the ball stud. The ball socket achieves relatively low insertion force but relatively high pull-out force resistance.