根据发展新型双层客车的需要,四方机车车辆工厂在四方车辆研究所等单位的配合下,于1960年设计并试制成功了U型转向架(图1)。该转向架是吸取了我国旧有几种主型转向架(如101、201、202型)的主要特点和存在的主要缺点进行设计的。同时还吸取了有关国外转向架的优点,如外侧悬 According to the needs of developing new double-decker buses, Sifang Locomotive and Rolling Stock Plant designed and piloted the U-type bogie in 1960 with the cooperation of Sifang Vehicle Research Institute and other units (Figure 1). The bogie is designed to absorb the main features and main shortcomings of several old main bogies (such as 101, 201, 202 type) in our country. At the same time also learned the advantages of foreign bogies, such as the outer hanging