Ball Joint Assembly Curved Stud Pivoting Mechanism
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Solution Overview
Problem
Conventional vertical bushings in automotive suspension systems experience reduced lifespan due to exposure to radial and twisting loads, leading to deterioration of the rubber cushion and increased wear.
Innovation Solution
A ball joint assembly with a housing and bearing featuring a spherically-shaped cavity and a stud with curved surfaces, allowing for slidable contact and reduced wear through a pivoting mechanism, which can be manufactured at low cost and used as a replacement for worn bushings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rubber cushion is used in a vertical bushing to allow pivoting movement, then the bushing can accommodate suspension movement, but the rubber cushion deteriorates due to radial load and twisting motion, reducing the bushing's life
Solution Approach 1:
The invention extracts the rubber cushion from the bushing assembly and replaces it with a metal-to-metal contact system consisting of a stud with curved surfaces and a bearing with a spherically-shaped cavity. This removes the rubber component that deteriorates under radial load and twisting motion, thereby extending bushing life while maintaining pivoting movement capability through the metal contact surfaces.
Solution Approach 2:
The invention substitutes the rubber-based mechanical system with a metal-based mechanical system. Instead of relying on rubber elasticity to accommodate pivoting movement, the system uses a stud with curved surfaces that make slidable contact with a bearing's spherically-shaped cavity, enabling movement through direct metal contact rather than rubber deformation.
2Adaptability or versatility
If a conventional vertical bushing with rubber cushion is used, then the bushing can pivot during suspension movement, but the rubber cushion is exposed to both radial load and twisting motion leading to deterioration
Solution Approach 1:
The invention removes the rubber cushion component entirely from the bushing assembly and replaces it with a metal stud and bearing combination. This extraction eliminates the material (rubber) that is susceptible to deterioration from radial load and twisting motion, thereby improving reliability while preserving the necessary pivoting capability through the metal contact surfaces.
Solution Approach 2:
The invention transitions from a composite material system (metal sleeves with rubber cushion) to a homogeneous metal system (metal stud with metal bearing). This eliminates the interface between dissimilar materials and the vulnerabilities associated with rubber material properties under combined loading conditions, improving overall reliability.
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 ball joint assembly exhibits improved operating life with reduced wear and can be manufactured at a lower cost, making it a viable aftermarket replacement for worn bushings.
Implementation Method 1
The stud is rotatable while the ball-shaped portion of the stud is positioned within the spherically-shaped cavity of the bearing to establish slidable contact between the curved surfaces of the stud and the curved bearing surface of the bearing
Data Source
AI summary
The ball joint assembly includes a housing and a bearing which has an inner surface that extends between open ends and which presents a bearing surface that surrounds a generally spherically-shaped cavity. A stud is provided which has an outer surface with a generally ball-shaped portion that has at least two curved surfaces and at least two recessed surfaces. The bearing has a passage with a slots that extend from one of the ends to the cavity. The ball-shaped portion of the stud is insertable into the cavity of the bearing by aligning the curved surfaces of the stud with the slots of the passage. The stud is rotatable while the ball-shaped portion of the stud is positioned within the cavity to establish slidable contact between the curved surfaces of the stud and the bearing surface of the bearing to allow pivoting of the stud relative to the bearing.