Socket Assembly Exit Bearing Axial Movement
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Solution Overview
Problem
In vehicle suspension systems, socket assemblies with ball studs face issues of misalignment, leading to uneven load distribution and increased torque requirements due to the fixed nature of bearings, which can result in reduced performance and premature wear.
Innovation Solution
A socket assembly design featuring a movable exit bearing with a frustum-shaped outer surface and an interference fit, allowing axial movement and reducing the force required to unseat the bearing, along with a dust boot and Belleville washers for lubrication and preload, to maintain alignment and performance even in misaligned configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exit bearing is fixed in its location, then the socket assembly maintains stable alignment, but the torque required to rotate the ball stud increases and performance deteriorates when misalignment occurs
Solution Approach 1:
The exit bearing is designed to be movable rather than fixed, allowing it to adjust its position axially within the housing. This dynamic capability enables the bearing to self-align when misalignment occurs, reducing the torque required to rotate the ball stud while maintaining stable alignment during normal operation. The bearing moves along the ball stud's equator to accommodate alignment variations.
2Ease of operation
If the exit bearing is made movable to accommodate misalignment, then torque requirements are reduced, but the bearing may become unseated and lose its predetermined location
Solution Approach 1:
The exit bearing incorporates a frustum-shaped outer surface that changes the geometric parameters of the bearing-housing interface. This frustum shape, combined with the interference fit, creates a self-centering mechanism that allows the bearing to move axially for alignment compensation while automatically returning to and maintaining its predetermined located position, preventing unseating.
Solution Approach 2:
The interference fit between the frustum-shaped exit bearing and the housing provides a pre-established mechanical constraint that cushions against the bearing becoming unseated. This prior cushioning mechanism ensures that while the bearing can move to accommodate misalignment, it remains confined within the housing and returns to its predetermined position.
3Manufacturing precision
If two socket assemblies are precisely aligned during installation, then load distribution is optimized, but the assembly is sensitive to misalignment which causes uneven load distribution
Solution Approach 1:
The movable exit bearing with frustum shape enables the socket assembly to self-correct alignment issues. When misalignment occurs, the bearing automatically moves to compensate, allowing the assembly to maintain proper load distribution without requiring precise initial alignment during installation. The system serves itself by detecting and correcting alignment deviations.
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 enhances the socket assembly's performance by allowing axial movement of the exit bearing, reducing torque requirements, and maintaining internal clearances, thus improving load distribution and extending the lifespan of the assembly.
Implementation Method 1
A second spring is disposed in the inner bore of the housing and biases exit bearing into a predetermined location established by the housing
Implementation Method 2
The frustum of a cone shape of the outer surface of the exit bearing reduces the forces required to unseat the exit bearing from the predetermined location
Implementation Method 3
The exit bearing is in an interference fit with the housing
Data Source
AI summary
The socket assembly has a housing with an inner bore which extends from a first end to a second end. A ball portion of a ball stud is received in the inner bore. A backing bearing is disposed in the inner bore and presents a curved bearing surface in surface-to-surface contact with the ball portion. A first spring biases the backing bearing against the ball portion. The socket assembly also includes an exit bearing with a cylindrical portion that is in contact with an equator of the ball portion and a semi-spherical portion that is in surface-to-surface contact with an opposite hemisphere from the first bearing surface. A second spring biases the exit bearing into a predetermined location established by the housing. The exit bearing is movable from the predetermined location in a direction towards the second end of the housing against a biasing force of the second spring.