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铁路货运提速要求有功率更大、重量更重的机车。为了不使其轴重超限，每台机车上要有2台三轴转向架或3台二轴转向架。重型机车采用迫导式转向架可以降低曲线通过时轮轨间的横向力。本文介绍了迫导式三轴转向架的曲线通过性能和运行稳定性方面的数值分析。在分析中，当该转向架的转向联杆杠杆比、转向联杆上部弹簧刚度、车轮踏面锥度、轮对支承刚度变化时，对稳定运行的车轮横向力和临界速度进行了数值验证。此外还研究了提高临界速度的可能性，结果表明，转向架联杆杠杆比的最佳值随曲线半径的变化而变化，在转向联杆上部弹簧刚度较大时，杠杆比越大，运行稳定性越差。适当调整轮对支承刚度可提高临界速度，并可使有强迫导向机构的转向架产生小的横向力。
Railway freight transport speed requirements have more power, heavier weight locomotive. In order not to over-limit their axle load, each locomotive must have 2 3-axle bogies or 3 2-axle bogies. The use of forced-bogie for heavy-duty locomotives can reduce the lateral force between the wheel-rail when the curve passes. This paper presents the numerical analysis of the curve passing performance and operating stability of forced-guided three-axle bogies. In the analysis, the wheel lateral force and critical speed of the bogie are verified numerically when the bogie’s steering link lever ratio, upper link spring stiffness, wheel tread taper and wheelset’s support stiffness change. In addition, the possibility of increasing the critical speed is also studied. The results show that the optimum value of the link ratio of the bogie varies with the curve radius. When the spring stiffness of the upper part of the steering link is large, the lever ratio is larger and the operation is stable The worse sex. Appropriate adjustment of wheelset support stiffness can increase the critical speed, and can force the bogie steering mechanism to produce a small lateral force.