A rack-and-piniongear set is enclosed in a metal tube, with each end of the rack protruding from the tube.
整个齿轮齿条式转向器装载金属壳内，其齿条从转向器伸出来与转向摇臂连接。
2
Some cars have variable-ratio steering, which uses a rack-and-piniongear set that has a different tooth pitch (number of teeth per inch) in the center than it has on the outside.