Spiderbot: An Open-Source Energy-Efficient Hexapod with Passive Gravity Compensation

2026-09-22

AI Summary

该研究通过使用带有被动弹簧的4连杆机构设计了一种节能六足机器人Spiderbot，减少了能量消耗并提高了在不同地形上的移动能力。

Abstract

Hexapod robots can achieve static stability with fewer actuated joints than bipeds or quadrupeds, yet many platforms still use 3-DOF legs, increasing weight and continuous torque requirement with limited gain in locomotion capability on flat, inclined and moderately rough terrains. We release Spiderbot, an open-source hexapod that uses a 4-bar linkage with a passive spring to mechanically support body weight, with a 2-DOF per-leg design that substantially reduces energy consumption. This mechanism substantially offloads gravitational torque during standing stance consuming only 1.5W (reduction of over 90\% over the unsprung version and up to 96\% over other similar hexapods). The passive spring compensation extends to payloads of up to 3.25kg with no additional torque requirements. The platform enables long-duration deployments on a modest battery budget and costs under \$400, making it suitable for large-scale multi-agent experiments. We validate the locomotion capabilities of the platform with an RL policy trained in mjlab, including successful sim-to-real transfer, despite the complexity of the mechanism. The platform is evaluated on flat and rough terrains, slope up to $15^\circ$ and step obstacles. We release all the CAD files, assembling instructions, and full training and deployment code along with the model checkpoints at https://erc-bpgc.github.io/SpiderBot/.

Problem

• Hexapod Robots
• Energy Efficiency
• Passive Gravity Compensation
• Locomotion Capability

Innovation

• hexapod robot
• energy efficiency
• passive gravity compensation
• low cost