Multi-State Clutch Assembly Variable Torque Control
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Solution Overview
Problem
Conventional clutch assemblies in electronic devices lack the ability to provide variable torque, which limits their functionality in customizing kinematic responses and user experience, particularly in devices like laptops that require adjustable configurations between open and closed states.
Innovation Solution
A multi-state clutch assembly that includes a shaft and two frictional elements, where the first element provides a constant break-away torque and the second element offers a variable torque, adjustable through a capstan system controlled by sensors and actuators, allowing for minimal resistance during configuration changes and sufficient static equilibrium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional clutch assembly with fixed torque is used, then the structure is simple, but the ability to customize kinematic responses and provide variable torque is limited
Solution Approach 1:
The clutch assembly is segmented into two independent frictional elements: a first frictional element providing fixed torque and a second frictional element providing variable torque. This segmentation allows each element to perform its specific function independently, enabling variable torque output without requiring complete redesign of the entire clutch system.
Solution Approach 2:
The second frictional element is designed to be adjustable between engaged and disengaged states, allowing the clutch assembly to dynamically change its torque characteristics. The actuator mechanism enables real-time adjustment of the second frictional element's engagement level, providing dynamic torque control based on operational requirements.
2Adaptability or versatility
If a second frictional element is added to provide variable torque, then torque versatility is improved, but the device complexity increases
Solution Approach 1:
The second frictional element is integrated within the same clutch assembly housing as the first frictional element, sharing common structural components such as the clutch body and actuator mechanism. This merging approach allows variable torque functionality to be added without proportionally increasing the overall device size or complexity.
Solution Approach 2:
The actuator mechanism serves multiple functions: it controls the engagement and disengagement of the second frictional element, adjusts the torque level, and can completely disconnect the second frictional element when needed. This multi-functionality reduces the need for separate control mechanisms for each frictional element.
3Force
If the second frictional element is engaged to provide higher torque, then the break-away torque increases, but the smoothness of configuration transitions decreases
Solution Approach 1:
The actuator mechanism enables dynamic adjustment of the second frictional element's engagement state, allowing the system to transition smoothly between different torque levels. By controlling the degree of engagement rather than providing only binary engaged/disengaged states, the system can optimize for either high torque or smooth transitions depending on operational needs.
Solution Approach 2:
The frictional characteristics of the second frictional element can be adjusted by changing parameters such as contact pressure, contact area, or friction coefficient through the actuator mechanism. This allows the break-away torque to be precisely controlled to match the required operational conditions, balancing torque requirements with transition smoothness.
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 smooth and efficient transitions between device configurations by adjusting torque levels based on sensor inputs, reducing vibration and enhancing user experience by providing the necessary resistance to maintain static equilibrium.
Implementation Method 1
The first torque component can have a hollow body characterized as having an exterior surface and an interior surface. The interior surface can be frictionally engaged the shaft.
Implementation Method 2
The second torque component can be frictionally engaged with the exterior surface of the first torque component such that the variable value is greater than the fixed value.
Implementation Method 3
a connector being wound around the clamp, and an actuator that can extend or retract the connector. The wire can be frictionally engaged with the clamp in a retracted state.
Data Source
AI summary
Clutch assemblies that can provide variable break-away torques are described. An exemplary multi-state clutch assembly can include a shaft, a first frictional element frictionally engaged with the shaft and a second frictional element that can provide variable friction. When the second frictional element provides a low friction, second frictional element can be rotatable relative to the first frictional element, which can remain stationary relative to the shaft. When the second frictional element provides a high friction, it can be secured to the first frictional element. Hence, the first and second frictional elements can be locked together and be rotatable relative to the shaft. Tightening or loosening the second frictional element can vary the overall break-away torque provided by the clutch assembly. The multi-state clutch assembly can be in communication with a sensor or a switch that can respond to a user to change the friction of the clutch assembly.