Frictional Connection Actuation via Shape Memory Alloy
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Solution Overview
Problem
Existing mechanical brake and clutch devices require external energy sources for activation, increasing complexity and reducing efficiency in controlled power transmission and temperature-dependent operations.
Innovation Solution
A device utilizing a toggle lever or web-like extension mechanism with shape-memory alloy (SMA) or other converter materials to create a frictional or form-fitting connection between components, allowing automatic engagement or disengagement based on thermal, magnetic, or electrodynamic energy changes without external control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external energy sources (hydraulic cylinders, electric coils) are used to activate brake or clutch devices, then reliable power transmission control is achieved, but device complexity increases
Solution Approach 1:
The brake or clutch device activates automatically based on its own operational state (temperature, centrifugal force) without requiring external energy sources. The shape memory alloy elements or centrifugal masses self-regulate the friction connection based on predefined physical thresholds, eliminating the need for external actuators while maintaining reliable control
Solution Approach 2:
The patent replaces complex mechanical actuation systems (hydraulic cylinders, electric coils) with simpler physical mechanisms. Shape memory alloys substitute for hydraulic/electric actuators, and centrifugal masses substitute for mechanical linkages, reducing device complexity while preserving functional reliability
2Ease of operation
If mechanical actuators (brake shoes, linkages) are used for activation, then controlled braking or clutching is achieved, but energy consumption increases
Solution Approach 1:
The device uses its own operational parameters (temperature changes during braking, rotational speed) to automatically activate or deactivate the friction connection. Shape memory alloys respond to temperature changes caused by braking itself, and centrifugal masses respond to rotational speed, creating a self-regulating system that consumes no additional energy
Solution Approach 2:
The patent changes the activation parameter from external energy input to intrinsic operational parameters. Temperature (via shape memory alloys) and rotational speed (via centrifugal masses) serve as activation triggers, allowing controlled operation without additional energy consumption
3Extent of automation
If shape memory alloy or centrifugal mass mechanisms are used, then external energy supply is eliminated, but device complexity may increase in other aspects
Solution Approach 1:
The patent extracts the complex control system (hydraulic/electric actuators, sensors, control logic) and replaces it with simple passive physical mechanisms. Shape memory alloy elements and centrifugal masses are direct replacements that eliminate entire subsystems, reducing overall structural complexity despite the specialized materials used
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 simple, self-sufficient, and energy-efficient switching or coupling processes between components, reducing the need for external energy supplies and enhancing operational reliability in temperature-controlled environments.
Implementation Method 1
a wire or strip-shaped converter material, which is connected to the other two ends of the active surface element and which, when energy is input, preferably when energy is input without contact, undergoes a change in shape
Data Source
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AI summary
An apparatus is described for producing a frictional and/or form-fitting connection between two components which are arranged such that they can be moved linearly or rotated relative to one another, for the purpose of transmitting forces and/or force moments which act in a linear and/or rotational manner between the two components, of which the first component surrounds the second component at least in sections with at least one inner wall which faces the second component, and the second component provides at least one active-face element which can be transferred in a force-loaded manner from a first position, in which the active-face element is spaced apart from the inner wall, into a second position, in which the active-face element enters the frictional and/or form-fitting connection with the inner wall. The invention is distinguished by the fact that at least one mechanical stressing element is provided which deploys a restoring force on the active-face element, which restoring force holds the active-face element in the first position, and by the fact that a kinematic system is provided which acts on the active-face element counter to the restoring force, is driven exclusively by a converter material and transfers the active-face element into the second position.