一、修订目的车轴是铁道车辆的重要零件。车轴标准是车辆最基本的标准之一。原车辆用车轴型式尺寸标准是1963年修订的,随着我国铁道车辆滚动轴承化的普及,TB450-63早已不能满足需要。为了使车轴型式尺寸标准适应铁路车辆现代化的要求,根据(73)交科技字 First, the purpose of revision Axles are important parts of railway vehicles. Axle standard is one of the most basic standards of vehicles. The original vehicle axle size size standard was revised in 1963, with the popularity of rolling bearing rolling bearings in China, TB450-63 already could not meet the needs. In order to adapt the axle type size standard to the modernization requirements of railway vehicles, according to (73)