Ball Socket Assembly Low Friction Roller Bearing
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Solution Overview
Problem
Existing ball socket assemblies in automotive applications face challenges with high turning torque when under load, leading to potential steering returnability issues in vehicles due to inadequate low-friction rotation mechanisms.
Innovation Solution
The introduction of a roller bearing assembly with needle rollers and a washer spring, or thrust washers, which allow for low-friction rotation of the ball stud and housing relative to each other, reducing the torque required for rotation and enabling reduced frictional resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a traditional ball socket assembly is used without additional bearing components, then the structure remains simple, but high turning torque occurs when under load leading to steering returnability issues
Solution Approach 1:
The roller bearing is nested within the ball socket assembly, with the roller bearing's outer race positioned inside the housing and the needle rollers contained within the roller bearing structure. This nested configuration allows the low-friction roller bearing to be integrated into the existing ball socket assembly without requiring separate external components, thereby reducing turning torque while managing structural complexity
Solution Approach 2:
The roller bearing acts as an intermediary element between the ball portion and the housing. It mediates the rotational interaction by providing a low-friction interface through its needle rollers, reducing the direct contact friction between the ball stud and housing while maintaining the structural integrity of the overall assembly
2Reliability
If a roller bearing assembly is added to reduce friction, then steering returnability improves, but the device complexity increases
Solution Approach 1:
The roller bearing assembly is nested within the housing structure, with the outer race of the roller bearing positioned inside the housing bore. The needle rollers are contained within the roller bearing's internal structure. This nested arrangement improves steering returnability through reduced friction while containing the complexity within a compact, integrated package
Solution Approach 2:
The roller bearing assembly is designed to be self-contained with the needle rollers and cage forming a complete bearing unit that requires no external adjustment or maintenance. The washer spring provides automatic preload adjustment, and the entire assembly serves itself without requiring additional external components or complex adjustment mechanisms, thereby improving reliability while limiting complexity growth
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 proposed solution significantly reduces the torque needed to rotate the ball stud and housing, thereby minimizing steering returnability issues and enhancing the operational efficiency of vehicle suspension and steering assemblies.
Implementation Method 1
A roller bearing is disposed in the inner bore of the housing and operatively supports the backing bearing to allow low friction rotation of the backing bearing relative to the housing
Implementation Method 2
a washer spring is disposed in the inner bore between the roller bearing assembly and the closed first end of the housing for biasing the backing bearing against the ball portion of the ball stud
Data Source
AI summary
The socket assembly includes housing with an inner bore which extends along a central axis from a closed first end to an open second end. A ball portion of a ball stud is disposed in the inner bore of the housing, and a shank portion of the ball stud projects out of the housing through the open second end. A backing bearing is disposed in the inner bore and slidably supports the ball portion of the ball stud. A roller bearing or a pair of thrust washers is disposed in the inner bore of the housing and operatively supports the backing bearing to allow low friction rotation of the backing bearing relative to the housing.