Quadrupedal walking mechanism

This is a design for a quadrupedal walking robot model, entirely composed of 3D-printed parts, requiring no metal hardware, ideal for showcasing intricate multi-link kinematic structures.

The model employs a single motor driving a central transmission shaft, which actuates an eccentric cam, and through multiple interconnected linkages, achieves a swinging effect in its four limbs. While the structure possesses the capability for actual locomotion, the current design primarily serves to demonstrate on a tabletop the principles of linkage transmission and coordinated motion, rather than continuous ground-based ambulation.

A 1:2 two-stage reduction system has been incorporated to enhance motor torque output. However, simultaneous leg movement still presents challenges, with a propensity for jamming on varied surfaces. During testing, the motor voltage was increased to 7V to prevent stalling, enabling smooth demonstration, but this significantly reduces the lifespan of the internal motor gears. Therefore, it is currently best suited for low-load educational display, rather than continuous operation as a mobile platform.

Significant time was dedicated during debugging to optimizing the assembly precision of individual components. Early prints frequently experienced assembly difficulties due to dimensional inaccuracies. After numerous revisions, all parts now achieve robust assembly without hardware, relying solely on snap-fits or interference fits.

• Total Part Count: 47
• Source File Format: SolidWorks 2022

• Ideal for demonstrating mechanical linkages and structural motion; recommended for tabletop teaching or dynamic demonstrations

   

Download and try it! Feedback regarding mechanism design, assembly tolerances, or drive optimization is welcome in the comments section!