Multi-Layer Conductive Spring for Precise Shape Memory Actuation
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Solution Overview
Problem
Existing mechanical components made from shape memory materials lack efficient mechanisms to induce phase transitions for shape changes, particularly in applications requiring precise control over temperature-driven transformations.
Innovation Solution
A mechanical component comprising a core and a sheath made from electrically-conductive shape memory material, where the core is configured to change shape upon warming past its transition temperature, with an insulator blocking electrical current flow between the core and sheath, allowing for controlled phase transitions and shape changes, and can be integrated into devices like consoles and keyboards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electrical current is passed through shape memory material to induce phase transition, then shape change can be driven, but control precision over temperature and phase transition becomes difficult
Solution Approach 1:
The patent divides the shape memory component into separate functional segments: a core structure made of shape memory material and a multi-layered spring assembly. This segmentation allows independent optimization of the shape memory material properties and the spring mechanical characteristics, enabling precise control over phase transition temperature and shape change behavior without compromising overall system automation.
Solution Approach 2:
The patent employs composite material structures, specifically combining shape memory material with spring elements in a multi-layered configuration. This composite approach allows the system to leverage both the phase transition properties of shape memory materials and the mechanical elasticity of springs, achieving precise temperature-controlled shape changes while maintaining automation capability.
2Extent of automation
If shape memory component is placed in tension between two electrodes, then phase transition can be induced, but device complexity increases
Solution Approach 1:
The patent merges the shape memory component with the spring structure into a single integrated assembly. The core shape memory material is positioned within the spring layers, eliminating the need for separate electrode tensioning mechanisms. Electrical current can be applied directly to the integrated component, simplifying the overall device structure while maintaining automated phase transition capability.
Solution Approach 2:
The spring assembly serves multiple functions simultaneously: it provides mechanical support, enables phase transition through its multi-layered structure, and facilitates electrical current distribution. This multi-functionality reduces the need for additional specialized components, thereby reducing device complexity while preserving automated control.
3Manufacturing precision
If multi-layered spring structure is used, then shape change precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs preliminary shaping of the core component during manufacturing, where the shape memory material is pre-formed into the desired configuration before final assembly. This preliminary action ensures precise shape change characteristics are built-in during production, reducing the need for complex post-assembly adjustments and simplifying the overall manufacturing process.
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
Enables precise control over shape changes in mechanical components, allowing for increased flexibility and functionality in devices such as consoles and keyboards by utilizing temperature-induced phase transitions in shape memory materials.
Implementation Method 1
the core is configured to move from the initial form to an activated form different in shape from the initial form upon a temperature of the core warming past a transition temperature of the shape memory material
Implementation Method 2
Shape memory materials can shift between a martensite phase and austenite phase depending on the temperature of the material
Implementation Method 3
Passing electric current through the shape memory material can warm the shape memory material past its transition temperature, inducing a martensite to austenite phase change
Data Source
AI summary
A mechanical component is provided. The component can have a core, a sheath circumferentially surrounding the core, and an insulator between the core and the sheath. The core can include a shape memory material that is arranged to move from an initial form to an activated form upon a temperature of the core warming past a transition temperature of the shape memory material. A distal portion of the sheath can be in electrical communication with a distal portion of the core, while the insulator blocks a flow of electrical current between a proximal portion of the sheath and a proximal portion of the core.