It is reported that around the world, car circulation ball steering gear about 45%, gear rack type converter about 40%, vortex rod roller type converter about 10%, other types of steering gear about 5%. The circular ball steering gear has been growing steadily. In the minibuses in Western Europe, the gear rack type converter has been greatly developed. Japan's car steering gear is characterized by a growing proportion of circular ball steering gear. It was equipped with different types of engines, different types of steering gear, and usage in buses soared from 62.5% in the 1960s to 100% now. Large trucks and pick-up trucks mostly use circular ball converters, but gear rack converters have also been developed, of which the use rate of circulating ball steering devices for minivans is 65%, and the use rate of gear rack steering devices is 35%.