Rear View Mirror Folding Mechanism Using Segmented Actuators
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Solution Overview
Problem
Existing rear view element folding devices for motor vehicles have complex structures and generate significant noise during position changes, making them inefficient and unsafe, especially when quickly adjusting between different positions.
Innovation Solution
A rear view element folding device utilizing two separate actuators - one for translation and another for rotation - with a shape memory alloy (SMA) actuator for locking and unlocking, and a magnetic angle adjuster or electric motor for precise positioning, allowing for a simple structure, reduced noise, and faster adjustments without compromising safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor is used for both locking/unlocking and positioning, then the device structure becomes simpler, but the device complexity increases due to functional integration and safety concerns
Solution Approach 1:
The patent divides the actuation system into two separate actuators: one dedicated to locking/unlocking engagement elements and another for positioning the element housing. This segmentation allows each actuator to be optimized for its specific function, improving reliability while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces a decoupling mechanism that separates the locking function from the positioning function. The first actuator controls engagement elements that can be decoupled from the element housing, allowing the second actuator to rotate the housing independently. This intermediary mechanism enables functional separation while maintaining system coordination.
2Object-affected harmful factors
If a traditional folding mechanism is used, then the structure is complete, but noise development increases during position changes
Solution Approach 1:
The patent replaces traditional mechanical folding mechanisms with a rotational positioning system. The element housing rotates around a rotation axis relative to the element foot, eliminating the need for complex folding joints and associated noise-generating mechanical interactions while achieving the same repositioning function.
3Productivity
If a single actuator is used for positioning, then the structure is simpler, but the adjustment speed decreases
Solution Approach 1:
The patent segments the positioning function into two independent actuation systems: one for locking state control and another for rotational positioning. This allows both actuators to operate simultaneously without interference, doubling the adjustment speed capability while maintaining individual actuator simplicity.
Solution Approach 2:
The first actuator can pre-position the engagement elements in the unlocked state before the second actuator performs the rotational positioning movement. This preliminary action prepares the system for faster adjustment by removing locking constraints in advance, enabling the second actuator to move the element housing without resistance.
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 solution results in a compact, efficient, and safe folding mechanism that can quickly adjust to any desired position with reduced noise and increased speed, maintaining service life while ensuring precise control and reaction to external conditions.
Implementation Method 1
a first actuator for a translation movement of a first engagement element that is firmly connected to the element housing relative to a second engagement element that is connected to the element foot along a rotation axis
Implementation Method 2
a magnetic angle adjuster or electric motor for precise positioning
Data Source
AI summary
A rear view element folding device is disclosed for approaching at least one pivot position of an element housing relative to an element foot that can be mounted on the motor vehicle. The rear view element folding device locks or unlocks at least one resting position of the element housing relative to the element foot. A method for triggering such a rear view element folding device is also disclosed.