Robotic Digit With Multi-Actuator CMC Joint
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current robotic hands lack the complexity and precision in finger movement, particularly in mimicking the humanoid thumb's functionality, which limits their ability to perform intricate tasks in diverse environments.
Innovation Solution
A robotic digit with a carpometacarpal (CMC) joint that incorporates multiple degree-of-freedom actuators and linkages, allowing for opposition, abduction, flexion, and extension movements, mimicking the human thumb's functionality, integrated into a robotic hand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If robotic hands use simple finger structures, then device complexity is reduced, but the ability to perform intricate tasks and mimic human dexterity deteriorates
Solution Approach 1:
The robotic finger is divided into multiple segments (phalanges) that can move independently relative to each other, allowing complex movements while maintaining manageable structural complexity at each joint
Solution Approach 2:
The robotic finger employs dynamic actuators and linkages that enable continuous adjustment of joint angles and positions, allowing the structure to adapt its configuration for different tasks while maintaining a relatively simple base structure
2Measurement precision
If robotic hands incorporate multiple degree-of-freedom actuators and linkages, then movement precision and versatility are improved, but device complexity increases
Solution Approach 1:
The actuator and linkage system is designed to perform multiple functions through a single integrated mechanism, where the same components enable both precise positioning and various movement types (opposition, abduction, flexion, extension), reducing the need for separate specialized mechanisms
Solution Approach 2:
Mechanical linkages serve as intermediaries that translate actuator movements into precise joint rotations, providing motion transformation and amplification while isolating the complexity of precision control from the actuators themselves
3Adaptability or versatility
If robotic hands mimic human thumb functionality with opposition and abduction movements, then adaptability and versatility are improved, but device complexity increases
Solution Approach 1:
The robotic thumb is designed with asymmetric positioning and different movement ranges compared to other fingers, with opposition and abduction capabilities that mirror human anatomy, allowing versatile grasping while using specialized rather than generic finger mechanisms
Solution Approach 2:
Multiple degrees of freedom are nested within the thumb structure, with actuators and linkages arranged concentrically or in compact configurations that allow complex movements within a limited spatial envelope, reducing overall structural complexity
Data Source
AI summary
A robotic digit includes a digit base frame, a joint head coupled to the digit base frame, and an articulated digit body coupled to the joint head. A first actuator and a second actuator are mounted to the digit base frame. The first actuator includes a first actuator output coupled to the joint head by a first mechanical linkage. The first actuator output causes a first relative movement between the joint head and the digit base frame through the first mechanical linkage. The second actuator has second actuator output coupled to the joint head. The second output causes a second relative movement between the joint head and the digit base frame that is different from the first relative movement through the second mechanical linkage.