From 1900 to 1939, developed countries in the automobile industry developed worm roller steering gears and worm finger pin steering gears, which were used in various types of automobiles. The automobiles produced in my country in the 1960s mainly use worm roller steering gears, such as Jiefang CA10 trucks produced by FAW Group Corporation since 1956 and Yuejin brand NJ130 trucks produced by Nanjing Automobile Factory. All use this form of steering gear. In the 1980s, the cars produced by Dongfeng Motor Company adopted the worm finger-type steering gear. The above two steering gears will gradually decrease in the application of newly developed cars in the future.
After 1939, foreign countries developed recirculating ball steering gear with higher efficiency. Although the manufacturing technology of this steering gear is complicated and the cost is high, it is still widely used in commercial vehicles in various countries. In my country, it has been used in trucks since the 1960s. After entering the 1980s, it has been widely used in cars, passenger cars and off-road vehicles, and has developed a variable ratio recirculating ball steering gear to meet the requirements of use.