Researchers at Universidad Carlos III de Madrid (UC3M) have developed a new soft joint model for robots, characterized by an asymmetrical triangular structure and an ultra-thin central column. Recently patented, this design aims to enhance movement versatility, adaptability, and operational safety in robotic systems.
According to Concha Monje, professor in the UC3M Department of Systems Engineering and Automation and principal researcher on the SOFIA project, the joint design enables greater bending angles with reduced force, improving robots’ flexibility and range of motion. The asymmetrical structure also incorporates a self-limiting mechanism that prevents the joint from exceeding its bending threshold, reducing the risk of material failure and extending the operational life of the robot.
The joint is constructed from flexible materials that absorb impacts, minimizing potential damage during operation and increasing safety in human-robot interactions. Its flexibility also allows for effective functioning in confined spaces and environments requiring adaptive handling capabilities. Monje noted that the joint can serve as an independent actuation module or be connected with additional modules to create complex robotic handling systems.
The joint’s consistent curvature simplifies its mathematical modeling, allowing for the development of control systems that operate efficiently with low computational demands. Furthermore, the joint can be produced using standard 3D printers and elastic materials, reducing production costs and enabling rapid manufacturing.
The UC3M RoboticsLab team is currently applying this technology in the development of a robotic claw, where the patented joint design enhances the dexterity of the fingers. This allows the claw to grip objects using various contact surfaces, improving precision and handling capabilities.
Photo credit: U3CM
