Some cars have variable-ratio steering, which uses a rack-and-pinion gear set that has a different tooth pitch (number of teeth per inch) in the center than it has on the outside.
The system can automatically measure Riss hardness of steeringgearrack, and then transform it into corresponding Rockwell, Brinell and Vickers hardness.
该系统可自动测试转向器齿条的里氏硬度，可转换成相应的洛氏、布氏、维氏值，并按生产要求自动进行分选。
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In this paper, the meshing theory of rackand pinion steeringgear with variable ratio is studied systematically.