Research Of Support Form Of Traction Motor Pinion In High Power Haul Locomotive

Driving system, one of important part in locomotive bogie, is the technical difficulty of bogie exploitation. As the domestic railway transportation tend to develop high speed and heavy haul, proposing higher requirement on single axis power of freight locomotive. Now the power has increased to 1600kw from 1200kw. Whether cantilever support structure, the traditional drive motor pinion support form, can suitable for the transfer of high power and high torque, how much the deformation of pinion effect gear meshing during the torque transformation; whether it effect the reliability and safe transformation of torque; how much effect it bring to the lifetime of bearing. These problems are waiting for further research and analysis.Changing the support form of motor pinion is a effective method to resolve those problems, also is the advantage technique in driving system of high power locomotive. Support forms of drive pinion decide the whole structure of driving system directly. According to the support forms of pinion, classified driving system into three kinds: cantilever support structure of pinion, outer end support structure of pinion and two ends support structure of pinion.In consideration of three different support forms of pinion, first, this paper studied and analyzed the gear meshing status. The difference of support forms of pinion lead to difference in Bending Deformation of pinions, difference in contact stress and bending stress of pinions, great change in wear and lifetime of pinions. The result of calculated three support form structures and analyzed contact statuses show that the force of pinion decreased obviously and force distribution in tooth surface become uniform while change the support form to outer end support and two ends support from cantilever support, this can decrease wear and prolong the lifetime of gear effectively. Second, this paper analyzed the selection and lifetime of bearing. As the change of support form of pinion, the requirement of bearing change, the result of calculated bearing in three different support forms under same condition show that the support of pinion more symmetric, the force of bearing get smaller, lifetime get longer; at the same time, bearing size can be decrease and bearing's speed limit can ba increase through the decreasing of bearing's force.While the structure, force and lifetime of parts of driving system changing, the transfer reliability of whole driving system will happen a great change accordingly. The result of calculated transfer reliability of pinions under three support forms show that the transfer reliability have a great improve while change the pinion into two ends support form, this improvement can decrease the failure probability and prolong the lifetime of driving system effectively.This paper studied the different support forms of motor pinion, understood the Variation of gear meshing status, bearing' choose and lifetime and reliability of gear transfer. Comparing the advantages and disadvantages, that will help us to digest and absorb the advantage technique, provide reference while developing domestic high power driving system and promote the technical improvement in domestic rolling stock industry.