车底架就是由各种纵向和横向钢梁组成的长方形构架。它承托着车体，是车体的基础。车底架承受上部车体及装载物的全部重量，并通过上、下心盘将重量传给走行部。在列车运行时，它还承受机车牵引力和列车运行中所引起的各种冲击力及其他外力。所以，它必须具有足够的强度和刚度，才能坚固耐用。
主要有主柱、车底架、车轮、电器箱、灯管支架、灯管支架旋转机构、定时器组成。
A rotating mechanism of a supporting frame of a lamp tube is respectively arranged on the upper part and the lower part of the main post.
从载荷的施加、约束的建立到网格单元的划分，本文详细介绍了混凝土泵车底架有限元模型的具体建立过程。
The concrete establishment progress of the truck mounted concrete pump's frame is presented from the exertion of loads, the establishment of restraints to the creation of meshes.
起重机通过其底架与汽车底盘与大梁连接。
The crane is connected with the main beam through its under-frame and the truck chassis.
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