Self-adaptive Mechanical Finger With Transmission Linkage
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Solution Overview
Problem
Current robotic hands face challenges in achieving self-adaptive capabilities without complex electronics or sensors, and existing prototypes are often costly and difficult to control due to the need for multiple degrees of freedom and actuators.
Innovation Solution
The development of mechanical fingers with three phalanges and a transmission linkage that allows for self-adaptive behavior by using a combination of passive elements and actuation, where the transmission linkage reaches the distal phalanx, is connected to the ground, and does not constrain the degrees of freedom, enabling efficient adaptation to object shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If robotic hands are designed with multiple degrees of freedom and independent actuators for each joint, then the adaptability and dexterity are improved, but the device complexity and control difficulty increase significantly
Solution Approach 1:
The mechanical finger is designed to be self-actuating through a transmission linkage that converts a single actuator's motion into coordinated motion of multiple phalanges. The system uses passive mechanical elements (linkages, joints, and springs) to automatically distribute the actuation force throughout the finger structure, eliminating the need for complex electronic control systems while maintaining adaptability.
Solution Approach 2:
A single actuator is designed to control multiple degrees of freedom simultaneously through the transmission linkage mechanism. The linkage system serves multiple functions: it transmits force, coordinates phalanx motion, and enables the finger to adapt to various object shapes, replacing what would traditionally require multiple independent actuators.
2Adaptability or versatility
If robotic hands use independent actuation for each joint, then the adaptability to object shapes is improved, but the cost and control difficulty increase
Solution Approach 1:
The mechanical finger is designed to be self-actuating through a transmission linkage that converts a single actuator's motion into coordinated motion of multiple phalanges. The system uses passive mechanical elements (linkages, joints, and springs) to automatically distribute the actuation force throughout the finger structure, eliminating the need for complex electronic control systems while maintaining adaptability.
Solution Approach 2:
Multiple actuation functions are merged into a single actuator through the transmission linkage mechanism. The linkage system combines the motion control of multiple phalanges into one integrated actuation system, reducing the total number of actuators required and thereby lowering manufacturing costs.
3Device complexity
If robotic hands are designed with simplified actuation systems, then the device complexity and cost are reduced, but the ability to adapt to object shapes may be compromised
Solution Approach 1:
A transmission linkage is introduced as an intermediary mechanism between the single actuator and the multiple phalanges. This linkage system acts as a mechanical mediator that translates the simple actuator motion into coordinated multi-phalanx movement, enabling the simplified actuation system to achieve the adaptability of more complex systems.
Solution Approach 2:
The transmission linkage is designed with dynamic characteristics that allow it to adapt to different grasping scenarios. The linkage geometry and spring properties are configured to automatically adjust the force distribution and motion patterns based on the object being grasped, enabling adaptability without requiring complex control algorithms.
Data Source
AI summary
A mechanical finger comprises at least three phalanges, with a base phalanx pivotally connected at a proximal end to a base. At least one intermediate phalanx is pivotally connected at a proximal end to a distal end of the base phalanx. An end phalanx is pivotally connected at a proximal end to a distal end of a distal-most one of the at least one intermediate phalanx. The phalanges pivot about parallel pivot axes. A transmission linkage is between the base and the end phalanx. The transmission linkage has links and joints unconnected to any of the phalanges other than the end phalanx, the transmission linkage being configured so as not to constrain the degrees of freedom of the mechanical finger.