Shuanghuan Driveline双环传动

About

World's largest EV gear manufacturer with subsidiary Huandong Technology (China's #1 RV reducer supplier, 14% share) supplying Tesla Optimus and Unitree; STAR Market IPO for Huandong accepted.

Taizhou, Zhejiang · Founded 1980 · Company website

Why in the Index

Precision gear and transmission maker (auto driveline). Expanding into harmonic reducers for the humanoid supply chain.

PAI exposure of 35% reflects the share of trailing-twelve-month revenue attributed to Physical AI activities. See methodology §4 for inclusion criteria and §6 for how PAI exposure scales the weight.

Key Physical AI activities

• RV Reducers (Huandong Technology) · Reducer · 2020RV reducers for humanoid robot heavy-load joints. China's #1 with 14% domestic market share. Supplies Tesla Optimus and Unitree.
• Harmonic Reducers · Reducer · 2024Harmonic reducers for lighter-load humanoid robot joints. Mass supply begun.

Key partnerships

• Tesla
• Unitree
• Estun
• Effort

Milestones

• 2020—Established Huandong Technology subsidiary to focus on RV reducers for robotics
• 2024—Confirmed as Tesla Optimus and Unitree core reducer supplier
• 2025—Robot reducer revenue grew 35.66% in H1, accounting for >20% of total revenue
• 2025-09—Huandong Technology STAR Market IPO application accepted

Competitive position

World's largest EV gear manufacturer (60%+ domestic share). Subsidiary Huandong Technology is China's #1 RV reducer supplier. Tesla Optimus and Unitree core supplier. Stock price increased ~500% from 2021-2026. Huandong STAR Market IPO pending. OPTIMUS LINK: Reportedly co-developing new RV-type reducer with Tesla, valued ~¥1,500/unit. RV reducer capacity 150K units (60-70% utilization). Harmonic reducer capacity 30-50K units/year.

Recent activity