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日本国铁时代开发的Z联杆式径向转向架具有良好的曲线通过性能，但其摇头运动稳定性较原用转向架稍低。为了在改善曲线通过性能的同时提高直线走行性能，开发了在Z联杆机构的基础上增加了新机构（N联杆）的径向转向架。所谓N联杆机构就是分别用独立的联杆将前后轮对的中心连结起来，使两平行联杆呈弹性连结的机构，目的是减少前后轮对运动的相位差，以抑制转向架的摇头运动，提高摇头运动的极限速度。本文对这种转向架的运动进行了数值解析，列出了计算方程式，并取得了满意的结果。
The Z-linkage radial bogie developed in Japan’s Rail era has a good curve-passing performance, but its stability of shaking its head is slightly lower than the original bogie. In order to improve the straight running performance while improving the curve passing performance, a radial bogie having a new mechanism (N link) added to the Z link mechanism has been developed. The so-called N-link mechanism is to use separate links to link the front and rear wheel center, so that the two parallel links are elastic link mechanism, the purpose is to reduce the phase difference between the front and rear wheel movement to inhibit the bogie moving head , Increase the speed limit of shaking his head. In this paper, the motion of the bogie is analyzed numerically, the calculation equations are listed, and the satisfactory results are obtained.