steering worm sector shaft 转向蜗杆齿形齿轮轴
steering worm sector bearing 转向器扇形蜗轮轴承
sector worm 扇形蜗杆
worm shaft and sector type 蜗杆轴扇轮式
worm and sector steering 蜗杆齿扇式转向器
worm and sector steering device 蜗杆齿弧式转向机
worm-and-three-teeth sector 蜗杆与三齿式齿扇
worm-and-spiral-teeth sector 蜗杆与螺旋齿扇齿
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