travelling wheel meaning in Chinese

行轮
行走轮
走轮

Cranes ; driving wheel units and idler wheel units ; travelling wheels
起重机.主动轮组和从动轮组.走轮
Transformers . dimensions of travelling wheels and associated locking devices
变压器.滑轮和锁定装置尺寸
Cranes ; driving wheel units and idler wheel units ; travelling wheel shafts
起重机.主动轮组和从动轮组.走轮轴
Transformers dimensions of travelling wheels and associated locking devices
变压器.带凸缘的滑轮支架叉形接头和锁定装置