蜗杆式转向机构 worm-type steering gear

球面蜗杆式转向器 hourglass worm steering

蜗杆蜗轮式转向机构 worm-and-wheel steering gear ; worm type steering gear

蜗杆曲柄指销式转向器 worm and crankpin steering gear

蜗杆螺母式转向 worm-and-nut type steering

蜗杆双滚轮式转向机构 worm-and-double-roller steering gear ; worm-and-twin-roller steering gear

蜗杆齿弧式转向机 worm and sector steering device

蜗杆曲柄销式转向机构 worm-and-lever steering gear

蜗杆螺母式转向机构 worm & nut steering box