Influence of the journal box positioning method to the load of tumbler node

The damage of the tumbler node was one of the common phenomena of the damage of the tumbler journal box setting. Aimed to the easy damage problem of the tumbler node of the CW-2 style bogie, two positioning method of the tumbler journal box was compared, one is the tumbler journal box of the CW-2 bogie, the other is the tumbler journal box on the high speed motor car of CRH₂. The position of the journal box spring has a big influence to the load of the tumbler node. The dynamic model of the high speed vehicles with the two different tumbler journal boxes were set up through the dynamic simulation soft SIMPACK. The simulation cases of high speed on straight line, brake condition and the condition of the horizon wind were carried to research load of the tumbler node. All the results of the three different cases were coincided with the theory analysis result. The tumbler node of the model which the CRH₂ tumbler journal box was adopted has a big longitudinal and lateral force; the tumbler node of the model which the CW-2 tumbler journal box was adopted not only has a big longitudinal and lateral force, but also has a bigger vertical force. The simulation results shown that the tumbler node of the CW-2 bogie has a bigger and complex force in total, this is the just reason why the tumbler node more easy damaged than other tumbler journal box.