Bearing Shape Memory Alloy Shim Precompression
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Solution Overview
Problem
Existing bearing manufacturing methods face challenges in achieving uniform precompression of elastomeric materials, often requiring lower-grade materials and inefficient installation processes.
Innovation Solution
The use of shape memory alloy shims that generate precompression upon temperature change, allowing for more efficient and uniform preloading of elastomeric members in a bearing assembly, enabling the use of higher-grade materials and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional methods are used to install elastomeric layers in precompression, then the bearing can be manufactured, but the process requires considerable effort and lower-grade elastomeric material
Solution Approach 1:
The patent applies preliminary action by pre-compressing the elastomeric layers between metal shims before final assembly. The shims are designed with slight oversize dimensions to create interference fit, which automatically generates the required precompression force when the bearing is assembled, eliminating the need for complex post-assembly compression processes
Solution Approach 2:
The patent changes the dimensional parameters of the metal shims relative to the elastomeric layers. The shims are manufactured with dimensions that are slightly larger than the elastomeric layers, creating an interference fit that generates precompression force through the geometric constraint rather than requiring external compression equipment
2Ease of manufacture
If lower-grade elastomeric material is used, then the material can be squeezed into bearing geometry, but the bearing requires more effort to install and achieve uniform precompression
Solution Approach 1:
The patent applies preliminary action by pre-compressing the elastomeric layers between metal shims before final assembly. The shims are designed with slight oversize dimensions to create interference fit, which automatically generates the required precompression force when the bearing is assembled, eliminating the need for complex post-assembly compression processes
Solution Approach 2:
The patent changes the dimensional parameters of the metal shims relative to the elastomeric layers. The shims are manufactured with dimensions that are slightly larger than the elastomeric layers, creating an interference fit that generates precompression force through the geometric constraint rather than requiring external compression equipment
3Manufacturing precision
If shape memory alloy shims are used to generate precompression, then uniform preloading is achieved and higher-grade materials can be used, but the device complexity increases
Solution Approach 1:
The patent utilizes phase transitions of shape memory alloy (SMA) material in the metal shims. The SMA shims undergo martensitic phase transformation at lower temperatures allowing easy installation, then transition to austenitic phase at higher temperatures to generate the precompression force, leveraging thermal phase change to achieve the desired mechanical effect
Solution Approach 2:
The patent utilizes thermal expansion characteristics of shape memory alloy (SMA) material in the metal shims. When heated, the SMA shims expand and generate precompression force against the elastomeric layers. The thermal expansion coefficient of SMA is specifically exploited to convert temperature changes into mechanical preloading
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 approach extends the life of elastomeric members by reducing indirect shear stress and allows for more uniform and cost-efficient precompression, enabling the use of higher-grade elastomeric materials in bearing manufacturing.
Implementation Method 1
a shim (105a-105c) including a shape memory alloy that is configured to produce a compression preload force upon the elastomeric member in response to a temperature change
Data Source
AI summary
The bearing assembly includes one or more elastomeric members loaded in a precompression by a shim that includes a shape memory alloy. The shape memory alloy is configured to generate the precompression in the elastomeric members upon a temperature change.