SMA Actuator Coupling for Vehicle Closure Release
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Solution Overview
Problem
Existing closure systems for vehicles, such as pickup trucks, lack efficient and reliable mechanisms for electrically actuated release mechanisms that can securely lock and unlock the end gate, particularly utilizing shape memory alloys (SMAs) to enhance operational convenience and security.
Innovation Solution
A closure release device incorporating a housing with an actuating lever and a crank lever, where a shape memory alloy (SMA) actuator selectively couples the actuating lever to the crank lever, allowing for electrically controlled locking and unlocking of the end gate by engaging or disengaging the latch mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional mechanical latch system is used for the end gate, then the structure is simple and reliable, but the ease of operation is reduced due to manual locking and unlocking requirements
Solution Approach 1:
The patent replaces manual mechanical operation with an electrically actuated SMA-based release mechanism. The SMA actuator converts electrical signals into mechanical motion to automatically engage or disengage the latch, eliminating the need for manual key insertion and manual lever operation, thereby significantly improving ease of operation while maintaining acceptable structural complexity
Solution Approach 2:
The patent utilizes shape memory alloy materials that undergo phase transformations in response to temperature changes or electrical heating. This parameter change enables the SMA element to automatically transition between contracted and extended states, driving the latch engagement and disengagement without continuous mechanical input, thus improving operational convenience
2Extent of automation
If an electrically actuated release mechanism is added to improve ease of operation, then operational convenience is enhanced, but the device complexity increases
Solution Approach 1:
The SMA actuator is designed to be self-actuating through electrical heating, which triggers the shape memory phase transformation automatically. This self-service mechanism eliminates the need for complex control systems, motors, or additional actuators, achieving automation while minimizing the increase in device complexity
Solution Approach 2:
The patent employs shape memory alloy phase transitions (martensitic transformation) to convert electrical energy directly into mechanical displacement. This phase transition mechanism provides a compact, reliable, and inherently simple way to achieve electrical actuation without requiring complex mechanical transmission systems
3Reliability
If the SMA actuator is used to selectively couple the actuating lever to the crank lever, then the reliability of locking and unlocking is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The coupling member is designed with dynamic engagement characteristics that allow it to selectively connect or disconnect the actuating lever from the crank lever based on SMA actuation state. The dynamic nature of the SMA-driven mechanism provides reliable engagement during actuation while allowing easy disengagement, reducing the stringency of manufacturing precision requirements compared to fixed mechanical linkages
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 SMA actuator enables secure locking and effortless unlocking of the end gate, enhancing operational convenience and security through electrically controlled actuation, suitable for various vehicle closures and compatible with different locking systems.
Implementation Method 1
A shape memory alloy (SMA) actuator is to selectively cause the coupling member to selectively couple the actuating lever to the crank lever. The SMA actuator is electrically actuated.
Data Source
AI summary
A closure release device includes a housing fixedly attached to a closure and an actuating lever rotatably disposed on an axis of rotation on the housing. A crank lever is rotatably disposed on the axis of rotation. A coupling member is to selectively couple the actuating lever to the crank lever for rotation together. A shape memory alloy (SMA) actuator is to selectively cause the coupling member to selectively couple the actuating lever to the crank lever. The SMA actuator is electrically actuated. The crank lever is to connect to a latch to selectively release or engage the latch in response to a coupling state of the actuating lever with the crank lever and an actuation state of the actuating lever.