Influence of Coupler and Buffer on Dynamics Performance of Heavy Haul Locomotive

Qu Tianwei1, Ma Weihua*, 1, Wu Dong2, Luo Shihui1, 2
1 Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu, China
2 Southwest Jiaotong University Changzhou Institute of Railtansport, Changzhou, China

© 2015 Tianwei et al

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu, China; E-mail:


Aimed at the safety problem of the locomotive under the dynamic braking condition, this paper analyzes the influence of the coupler and buffer system. The coupler reposition methods of the large rotation angle coupler and the small rotation angle coupler under longitudinal coupler press force were compared. The influence of coupler and buffer system to the dynamics performance of locomotive was researched through dynamic simulation. Results show that the longitudinal coupler press force afforded by large rotation angle coupler with coupler shoulder, is larger than that of small rotation angle coupler.

Keywords: Coupler and buffer, longitudinal, heavy haul, dynamics, wheel/rail, Stability style.