Coated Preload Washer in Socket Assembly for Friction Heat Control
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Solution Overview
Problem
Socket assemblies in vehicle suspension and steering systems face issues with friction between components, leading to heat generation, diminished preload properties, and reduced useful life due to material property changes and misalignment of bearings.
Innovation Solution
A socket assembly with a preload washer coated in a low friction, heat insulating material to reduce heat generation, maintain preload capacity, and facilitate self-alignment of bearings, combined with a dust boot for enhanced protection and assembly simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hardened materials are used for ball stud and bearings to meet automotive design requirements, then strength and durability are improved, but friction between components increases generating heat that alters material properties and diminishes preload capacity
Solution Approach 1:
A coating layer is applied to the preload washer to serve as an intermediary between the hardened washer and the bearing surfaces. This coating reduces direct metal-to-metal contact and friction, thereby reducing heat generation while maintaining the structural integrity and preload capacity of the hardened components.
Solution Approach 2:
The preload washer is constructed as a composite structure with a hardened base material providing strength and a coated surface layer providing low-friction properties. This composite approach allows simultaneous achievement of high strength and low heat generation through the combination of different material properties.
2Reliability
If friction is reduced through coating the preload washer, then heat generation is reduced and preload capacity is maintained, but manufacturing complexity increases due to additional coating process
Solution Approach 1:
The invention modifies the surface properties of the preload washer by applying a coating with different friction characteristics. This parameter change (surface friction coefficient) maintains reliable preload capacity while the coating application process is integrated into existing manufacturing workflows, minimizing additional complexity.
3Ease of operation
If friction between bearing and ball stud is reduced, then bearing self-alignment is improved, but manufacturing precision requirements increase to ensure proper coating application
Solution Approach 1:
The low-friction coating on the preload washer enables the bearing to self-align during operation by reducing frictional resistance to alignment movements. The coating application process uses standardized techniques that achieve sufficient precision without requiring ultra-precise manufacturing, allowing the system to self-correct minor misalignments.
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 solution extends the operational life of socket assemblies by reducing friction, maintaining preload integrity, and ensuring optimal alignment, thereby enhancing durability and performance.
Implementation Method 1
The low friction aspect provided by the coating on the preload washer reduces the generation of heat within the socket assembly
Implementation Method 2
The heat insulating aspects of the coating also protect the preload washer from losing its 'as manufactured' material properties
Data Source
AI summary
A socket assembly includes a housing having an inner bore extending along a central axis between a closed first end and an open second end. At least one bearing is disposed in the inner bore, wherein the at least one bearing has a bearing surface and a support surface opposite the bearing surface. The socket assembly also includes a ball stud having a shank portion extending outwardly from the housing through the open second end and a ball portion disposed in the inner bore. At least one preload washer biases the at least one bearing into engagement with the ball portion of the ball stud. The at least one preload washer has an outer coating of a low friction, heat insulating material.