Ball Joint Insert-Molding for Stabilizer Link Durability
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Solution Overview
Problem
The existing methods for manufacturing ball joints for stabilizer links face challenges such as damage to the ball seat opening during assembly, reduced fall-off load, and the necessity of an unnecessary hole in the outer housing due to the integration of the stud and ball sections, which affects durability and space occupancy.
Innovation Solution
A method involving insert-molding a ball seat assembly using a ball stud with an integrated ball section as a core, followed by insert-molding the outer housing using the same core, allowing for a combined structure without gaps and eliminating the need for additional holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diameter of the opening section of the ball seat is increased to allow easy insertion of the ball section, then the ease of manufacture is improved, but the fall-off load decreases and reliability deteriorates
Solution Approach 1:
The invention divides the ball seat into multiple sections: an insertion section with a larger diameter for easy ball section insertion, and a fixation section with a smaller diameter for secure retention. This segmentation allows the opening to accommodate easy insertion while maintaining high fall-off load through the narrower fixation portion.
2Productivity
If the stud section and ball section are integrated in advance, then the manufacturing process is simplified and productivity is improved, but an unnecessary hole becomes necessary in the outer housing, increasing device complexity
Solution Approach 1:
The invention extracts the problematic hole from the outer housing by providing a separate lid member that closes the hole. This allows the outer housing to maintain its structural integrity while the integrated ball stud assembly proceeds with simplified manufacturing. The lid member is subsequently attached to seal the hole, eliminating the complexity issue.
3Reliability
If the opening section diameter is too small, then the reliability is maintained, but the ease of manufacture deteriorates due to damage risk during assembly
Solution Approach 1:
The ball seat opening is segmented into an insertion section with larger diameter for damage-free ball section insertion, and a fixation section with smaller diameter for reliable retention. This allows the assembly process to proceed easily without damaging the opening, while the fixation section maintains the necessary structural integrity.
Data Source
AI summary
Provided is a method for manufacturing a ball joint including a ball-seat molding step for forming a ball seat assembly by using, as a core, a ball section of a ball stud, the ball section of which is integrally provided in advance at one end portion of a stud section, and insert-molding a ball seat made of resin to cover at least a portion of the ball section present on an opposite side to the stud section, and a housing molding step for insert-molding a housing made of resin by using, as a core, the ball section partially covered by the ball seat of the ball seat assembly.