滚筒(Roller)
非驱动和非转向轮。常用于工业车辆，例如位于载重单元下方的搬运车或轮臂中的平台车。
英文介绍
Non-driven and non-steered wheel. Frequently used in industrial trucks, located e.g. in pallet trucks under the load-carrying unit or in platform trucks in the wheel arms.