Non-Uniform Linear Flexure Bearings for Stack Alignment
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Solution Overview
Problem
Traditional linear flexure bearing stacks face alignment challenges as the number of spacers and flexures increases, leading to potential misalignment and increased part count, assembly time, and cost.
Innovation Solution
The integration of a flexure with at least one spacer to form a single integral part, where the flexure is thicker at the center and rim and thinner between them, reducing alignment tolerances and eliminating the need for separate spacers, thereby improving alignment and reducing part count and assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple spacers and flexures are used in a stack, then the bearing capacity is improved, but the alignment precision deteriorates due to cumulative misalignment
Solution Approach 1:
The patent combines the spacer and flexure into a single integrated component called an 'integrated flexure-spacer assembly'. This merging eliminates the interfaces between separate spacer and flexure parts, thereby eliminating cumulative misalignment errors while maintaining the load-bearing capacity provided by multiple stacked assemblies
Solution Approach 2:
The integrated flexure-spacer assembly is segmented into multiple identical units that are stacked together. Each unit is self-contained with built-in alignment features, allowing modular assembly while preventing cumulative misalignment through the integrated design of each individual unit
2Strength
If multiple spacers and flexures are used in a stack, then the load distribution is improved, but the device complexity increases
Solution Approach 1:
By merging the spacer and flexure into a single integrated component, the patent reduces the total part count while maintaining multiple load-bearing elements within each assembly. This eliminates the need for separate spacer and flexure parts, simplifying the overall device structure
3Reliability
If multiple spacers and flexures are used in a stack, then the seal effectiveness is improved, but the assembly time increases
Solution Approach 1:
The integration of spacer and flexure into a single pre-assembled unit with built-in alignment features enables faster assembly. The modular design allows for quick stacking of identical units without requiring complex alignment procedures, reducing assembly time while maintaining seal effectiveness
4Manufacturing precision
If the flexure has non-uniform thickness, then the alignment precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The flexure is designed with non-uniform thickness where specific regions are thinner to provide flexibility and alignment tolerance. This local variation in thickness is strategically positioned to improve alignment precision while the overall manufacturing process remains compatible with standard fabrication methods
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
This solution enhances alignment in flexure bearing stacks, reduces part count, and lowers assembly time and costs by creating a single integral part with varying thicknesses to prevent flexure arm contact during axial motion, maintaining a precise seal between the piston and housing.
Implementation Method 1
a flexing region between the first and second portions... each membrane flexes when the bending force is applied to the assembly
Data Source
AI summary
A system includes a linear flexure bearing including an integral one-piece plate. The plate has a first portion, a second portion surrounding the first portion, and a flexing region between the first and second portions. At least one of the first and second portions is thicker than the flexing region. Other features are also provided.