一、对建筑机械用汽车底盘及发动机的要求建筑机械用汽车底盘不仅需要有良好牵引性能,还要求有较大的承载能力(见表1),因此对于一般载重汽车用的牵引底盘须进行局部加强和改装后才能应用。建筑机械所用的发动机,以柴油机居多,除要求有较大的输出功率以外,还应有良好的冷车启动性、大扭矩运转和变载运转的稳定性及一定的超负荷工作能力等。从经济观 I. Requirements for the chassis and engine of construction machinery used vehicles The chassis of the construction machinery not only needs good traction performance, but also requires a large carrying capacity (see Table 1). Therefore, the traction chassis for general trucks must be partially It can only be applied after strengthening and refitting. The engines used in construction machinery are mostly diesel engines. In addition to the requirement for greater output power, they should also have good cold startability, high torque operation, and the stability of variable load operation and certain overloaded working capabilities. From the economic perspective