Robotic Wrist Differential Actuation for 3D Positioning
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Solution Overview
Problem
There is a need for a humanoid robot that can be easily integrated into diverse environments to assist or substitute for humans, requiring a robotic wrist with multiple degrees of freedom to position an end effector in a three-dimensional space effectively.
Innovation Solution
A robotic wrist with a differential mechanism driven by two actuators, where the difference between their outputs controls one degree of freedom (abduction) and a commonality between their outputs controls another degree of freedom (flexion), allowing precise positioning of an end effector in a three-dimensional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a robotic wrist with multiple degrees of freedom is designed to position an end effector in three-dimensional space, then the positioning capability and versatility are improved, but the device complexity increases
Solution Approach 1:
The robotic wrist is divided into multiple independent segments, each responsible for a specific degree of freedom. The wrist includes a proximal segment, intermediate segment, and distal segment, with each segment containing specific actuators and linkages. This segmentation allows complex three-dimensional positioning to be achieved through coordinated movement of simpler, modular components rather than a single complex mechanism.
Solution Approach 2:
The robotic wrist employs dynamic actuation mechanisms where actuators are actively controlled to achieve desired positions and orientations. The system uses multiple actuators with independent control to dynamically adjust the position of the end effector in three-dimensional space, allowing adaptive positioning rather than fixed mechanical constraints.
2Measurement precision
If multiple actuators and mechanical linkages are added to achieve multiple degrees of freedom, then the positioning precision is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Each degree of freedom is implemented as a separate modular unit with its own actuator and linkage. The wrist contains distinct proximal, intermediate, and distal segments that can be manufactured independently and then assembled. This modular approach maintains positioning precision while simplifying the manufacturing process compared to a monolithic complex mechanism.
Solution Approach 2:
The mechanical linkages and actuators are designed with universal interfaces and standardized components that can serve multiple functions. The same linkage structures are used across different segments, and actuators are selected from standardized families, reducing the variety of unique parts that need to be manufactured and simplifying production.
Data Source
AI summary
A robotic wrist includes a wrist frame, a first actuator having a first actuator output, and a second actuator having a second actuator output. A first mechanical linkage includes a first input coupled to the first actuator output and a first output coupled to the wrist frame. A second mechanical linkage includes a second input coupled to the second actuator output and a second output coupled to the wrist frame. A rotational position of the first output about a first axis is responsive to a position of the first actuator output. A rotational position of the second output about a second axis that is transverse to the first axis is responsive to a different between a position of the first actuator output and a position of the second actuator output.