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轴式为C0-C0的DF4、DF8和DF11系列内燃机车已不适应于牵引5 000 t重载列车,开发大功率的八轴内燃机车是一种较好的技术措施。采用B0-B0+B0-B0轴式的八轴机车的动力学性能,尤其是曲线通过性能较好。但这种结构由于增加了两个动力轮对和两个过渡构架及三系悬挂,增加了车体的长度和机车总体高度,为了满足机车限界要求,给轴箱设计带来了很大困难,因而轴箱结构型式与常用的转臂式轴箱不同。强度计算表明,八轴机车轴箱新型结构型式满足强度要求。
DF4, DF8 and DF11 series diesel locomotive with C0-C0 axis are no longer suitable for traction of 5 000 t heavy haul trains. It is a good technical measure to develop high-power eight-axle diesel locomotive. B0-B0 + B0-B0 axis using the eight-axis locomotive dynamic performance, especially the curve through the better performance. However, this structure increases the length of the vehicle body and the overall height of the locomotive due to the addition of two power wheel pairs, two transitional frames and three-series suspension. In order to meet the requirements of locomotive clearance, it brings great difficulties to the design of the axle box, Therefore, the type of axle box structure and the commonly used rotary axle box is different. The strength calculation shows that the new type of axle structure of eight axle locomotives meets the strength requirements.