With the continuous growth of the national economy and under the guidance of relevant government departments, China's gear transmission manufacturing industry has experienced remarkable development. Gears and their related components are essential elements in mechanical systems, with gear transmissions serving as the core mechanism in most machinery. Reducers play a vital role in various industrial applications, and their importance continues to grow as technology advances. During the Tenth Five-Year Plan period, China's gear industry saw rapid expansion. By 2005, the annual output value of the sector had risen from 24 billion yuan in 2000 to 68.3 billion yuan, reflecting a compound annual growth rate of 23.27%. This growth solidified its position as the largest mechanical basic component industry in China. In terms of market demand and production scale, the industry has surpassed Italy, securing the fourth position globally. The applications of China's gear industry are widespread. First, in the automotive sector, manual gearboxes for heavy, medium, light, and micro vehicles, along with motorcycle gears and engineering machinery transmissions, are now largely produced domestically. These products meet the needs of major manufacturers and some have even been exported. However, automatic transmissions for cars are still dominated by imported models. Second, in vehicle drive axles, spiral bevel gears, straight bevel gears, and wheel reducers are mostly sourced locally. Companies like East Windmill Bridge are undergoing restructuring, showing promising signs for future growth. Third, in the field of general-purpose industrial gearboxes, foreign companies such as SEW have entered the market, spurring domestic enterprises to improve product standardization, modularity, and technical quality. Some Chinese-made gearboxes now compete with international brands, with certain products reaching global standards and being exported to Europe and the U.S. Fourth, in high-speed and heavy-duty gear manufacturing, key players include Nanjing High-Precision Gear Co., Ltd., Chongqing Gearbox Factory, Hangzhou Forward Gearbox Group, Zhengzhou Machinery Research Institute, Luoyang Zhongzhong Deceleration Machine Company, and Shenyang Mine Reducer Company. These firms have contributed significantly to the development of large-scale equipment and the shipbuilding industry through technology transfers. Fifth, in specialized gear types such as non-circular, plastic, powder metallurgy, and small modulus gears, China lacks leading enterprises at present, and there is still room for technological advancement. Sixth, in terms of gear-specific equipment, private enterprises have grown rapidly over the past five years, while state-owned enterprises have developed more slowly. Most of the advanced finishing equipment in the gear industry is still imported. However, some progress has been made, including the development of worm wheel grinding machines by Qinchuan Machine Tool Plant, CNC machines by Chongqing and Nanjing factories, and spiral bevel gear grinders. These advancements signal hope for greater independence and innovation in China's gear industry. Steering boxes are mainly classified into T-type spiral bevel gear steering boxes, ARA-type spiral bevel gear steering boxes, and HD-type spiral bevel gear commutators.
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