Abstract: To better understand the process of bogie curve negotiation, according to the creep theory, dynamic equation is deduced. It is found that the main factor that restricts the bogie curve negotiation performance is a larger positioning stiffness in the traditional bogie, which limits the yaw motion and the self-steering ability of wheelset. Relative to the conical tread, the wheel diameter difference can be provided by wear tread when wheelset negotiates 300 m radius curve. Because the traditional three axle bogie has a larger positioning stiffness. When the bogie negotiates less than 1 100 m radius curve, flange contact occurs on the lead wheelset outer side and rear wheelset has a better performance with smaller angle of attack. The wheelset yaw motion is coupled to ensure the stability in the radial bogie. By the radial mechanism, the function of transmitting traction force and steering of the wheelset is separated. The using of smaller positioning stiffness and antiphase coupling yaw motion of end axle wheelset can promote each other wheelset curve negotiation performance and decrease the angle of attack. The radial bogie can negotiate over 450 m radius curve without flange contact.

Key words: Angle of attack, Creep, Radial bogie, Steering, Three axle bogie