ball nut-type steering gear中文什么意思

[作业 运输] 球状螺帽型转向齿轮

• ball-nut type steering gear:    循环球式转向器
• ball bearing nut steering gear:    用螺杆和滚子螺母的转向机构
• circulating ball and nut steering gear:    循环滚珠螺母转向机构