Sliding Element Coupling for Bearing Assembly
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Solution Overview
Problem
Existing flanged half-bearings in automotive applications face challenges such as complex assembly processes, high manufacturing costs, stiffness issues, and debris introduction due to close tolerances and welding, leading to increased scrap rates and installation difficulties.
Innovation Solution
A sliding element comprising a half-shell bearing and thrust washers coupled by a separate, resilient coupling element, which reduces assembly complexity, eliminates the need for close tolerances, and uses a plastics material to minimize debris and enhance flexibility for easier installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser welding is used to permanently assemble the half-shell bearing and thrust washer, then the assembly strength is improved, but the assembly becomes very stiff affecting ease of installation and weld spots can break creating debris
Solution Approach 1:
The coupling element is divided into a first portion that engages with the half-shell bearing and a second portion that engages with the thrust washer, creating a segmented connection system that provides strength while maintaining flexibility for installation
Solution Approach 2:
The coupling element is made from a resilient material that changes its mechanical properties during installation, allowing it to be flexible during assembly and rigid during operation, thus resolving the contradiction between installation ease and assembly strength
2Reliability
If close tolerances are used in the mechanical engagement features, then the reliability of connection is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The coupling element is made from a resilient material that can deform elastically, allowing it to accommodate tolerance variations in the engagement features while maintaining reliable connection, thus reducing manufacturing complexity requirements
Solution Approach 2:
The coupling element incorporates elastic deformation capability, transforming a static rigid connection into a dynamic flexible connection that adapts to manufacturing tolerances while maintaining connection reliability
3Strength
If welding process is used to assemble the components, then the assembly strength is improved, but debris is introduced into the clearance space
Solution Approach 1:
The welding process is replaced with a mechanical coupling system using resilient material that achieves strong assembly through elastic deformation and friction, eliminating the harmful debris generation associated with welding
4Stability of the object's composition
If the assembly is made rigid to cope with transportation and handling, then the structural stability is improved, but the flexibility to accommodate machining tolerances and permit installation is reduced
Solution Approach 1:
The assembly transitions from a static rigid structure to a dynamic flexible structure where the coupling element can elastically deform during installation to accommodate tolerances, then maintains structural stability during operation
Solution Approach 2:
The coupling element's material properties are selected to provide different effective stiffness at different stages: flexible during installation to accommodate tolerances, and rigid during operation to maintain structural stability
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 simplifies manufacturing, reduces scrap rates, and provides a flexible assembly that can be easily installed into engine housings, while minimizing debris and maintaining performance under torque loads.
Implementation Method 1
a resilient coupling element, which reduces assembly complexity, eliminates the need for close tolerances, and uses a plastics material to minimize debris and enhance flexibility
Data Source
AI summary
A sliding element, e.g., a sliding element for slidably supporting a rotatable shaft, may include a first sliding element component, a second sliding element component, and at least one coupling element. The at least one coupling element may be configured to be coupled to the first sliding element component and may be configured to be coupled to the second sliding element component to releasably couple the first sliding element component and the second sliding element component together.