Core Viewpoints - The article emphasizes that reducers are the core components of humanoid robot joints, ensuring high precision and stability in motion control. The domestic reducer market in China is continuously growing, with improving craftsmanship and increasing supply capabilities of local manufacturers [2][8]. Group 1: Reducer Types and Comparisons - Current precision reducers for humanoid robot joints can be categorized into harmonic reducers, RV reducers, planetary reducers, and cycloidal pinwheel reducers. Each type has distinct characteristics in terms of transmission precision, size, and cost [3][21]. - The comparison of different reducer types shows that harmonic and cycloidal pinwheel reducers offer higher precision, while RV reducers are larger and more cost-effective. Planetary reducers are the least precise but are low-cost and easy to manufacture [3][21][22]. Group 2: Market Trends and Growth - The production of reducers in China has increased from 8.52 million units in 2019 to 14.7 million units in 2023, indicating stable growth over five years. The market size is projected to reach approximately 144.8 billion yuan in 2024, with a year-on-year growth of 4.4% [24][25]. - The demand for reducers is driven by the industrialization process in China, with increasing needs from downstream markets such as industrial robots and semiconductor equipment [25][26]. Group 3: Investment Recommendations - The article recommends investing in companies such as Fuda Co., Precision Forging Technology, Double Ring Transmission, and Zhongding Co. It also suggests paying attention to leading reducer manufacturers like Zhongdali De and others [5][8].