A 3-DOF Bionic Waist Joint for Humanoid Robot.

Area of Science:

• Robotics and Biomechanics
• Mechanical Engineering

Background:

• Humanoid robots require advanced joint mechanisms for safe and effective interaction.
• Existing robotic waist joints often face limitations in load capacity, weight, and torque amplification.

Purpose of the Study:

• To develop a 3-degree-of-freedom (DOF) bionic waist joint using a coupled tendon-driven mechanism.
• To enhance the safety of human-robot interaction and increase load capacity without adding weight.
• To achieve human-like kinematic characteristics, including DOF and range of motion (ROM).

Main Methods:

• Design and implementation of a novel coupled tendon-driven mechanism for the bionic waist joint.
• Integration of multiple motors to drive individual joint motions, enabling torque multiplication.
• Development of a unique mechanism to address the coexistence of coupling and decoupling in rotating joints.

Main Results:

• The bionic waist joint achieved a maximum torque amplification of 3 times the motor output torque.
• The developed joint demonstrated kinematic characteristics similar to the human waist (DOF and ROM).
• Experimental validation confirmed the basic movements and operational characteristics of the bionic waist.

Conclusions:

• The coupled tendon-driven mechanism offers a viable solution for enhancing robotic waist joint performance.
• The bionic waist joint provides improved safety, load capacity, and torque output, making it suitable for human-robot interaction.
• The novel mechanism advances the versatility of tendon-driven systems in robotics.