Inchworm Robotic Muscle Actuation With Tendon-Driven Motion
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Solution Overview
Problem
Current actuator technologies in robotics are inefficient and costly, limiting the development of mobile robotic systems that require multiple actuators for complex motions, making them impractical for everyday use.
Innovation Solution
Inchworm actuators are used in combination with tendon-like structures to provide flexible and efficient motion, allowing devices to move by tightening and loosening strings, with H-shaped clamps and spring elements for enhanced stability and speed, and bi-directional servo motors for controlled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional actuators are used for complex robotic motions, then motion capability is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The inchworm actuator is designed to perform multiple functions (locomotion, manipulation, climbing) that traditionally required different specialized actuators. A single inchworm actuator can replace multiple conventional actuators by using its gripping and inching mechanisms for various motion tasks, thereby reducing overall device complexity while maintaining versatility
Solution Approach 2:
Tendon-like structures serve as intermediaries between the inchworm actuator and the robotic limbs or effectors. The actuator pulls on these tendons to transmit force and motion over distances, enabling complex motions without requiring actuators at every joint or movement point
2Adaptability or versatility
If multiple actuators are used for complex motions, then motion versatility is improved, but manufacturing cost increases
Solution Approach 1:
By using a single type of inchworm actuator for multiple motion tasks that traditionally required different actuators, the system reduces the variety of components needed. This standardization simplifies manufacturing processes and reduces costs associated with sourcing, inventory, and assembly of multiple actuator types
Solution Approach 2:
The inchworm actuator design allows for simpler, potentially less expensive construction compared to traditional precision actuators. The patent suggests that these actuators can be manufactured more economically, making complex robotic motions accessible at lower cost
3Reliability
If traditional actuators are used for mobile robotics, then reliable motion is achieved, but device bulkiness increases
Solution Approach 1:
The inchworm actuator extracts the essential motion-generating components from bulky traditional actuator housings. By using compact piezoelectric or electromagnetic elements that directly drive the gripping and inching mechanism, the design achieves reliable motion with significantly reduced volume
Solution Approach 2:
Traditional mechanical actuators with gears, shafts, and housings are replaced with more compact piezoelectric or electromagnetic actuators. This substitution eliminates bulky mechanical transmission components while maintaining motion reliability through direct actuation of the gripping elements
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 inchworm actuator system enables versatile, scalable, and cost-effective robotic designs capable of complex motions, such as climbing and navigating tight spaces, with reduced bulkiness and complexity compared to traditional actuators.
Implementation Method 1
at least one piezoelectric actuator positioned to expand and contract in response to changes in voltage
Implementation Method 2
at least one spring element positioned to assist the at least one clamp element in gripping and releasing the string
Data Source
AI summary
An actuated or mobile device such as a mobile robot or robotic muscle is provided, wherein mobility may be enabled by means of novel models of inchworm actuator optimized to produce different varieties of motion, such as inching along different varieties of rail(s) or track(s) or extending and collapsing a paddle on a wheel. The various novel models of inchworm actuator further vary in step length, correlation of device state to power state, and other design aspects.