With advancements in AI, IoT, big data, sensors, and BIM technologies, the construction industry is transitioning from traditional manual/semi-automated methods toward full automation, intelligence, and data-driven operations. Intelligent construction has now become the dominant trend, where construction robots significantly accelerate project timelines and are essential for industry-wide quality enhancement. As critical components ensuring robotic precision and stability, harmonic drives, RV reducers, and planetary gearboxes perform distinct roles across various robot subsystems.