Original scientific paper

BWE traction units failures caused by structural elasticity and gear resonances

Milosav B. Ognjanović ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11000 Beograd, Serbia
Miloš Ristić ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11000 Beograd, Serbia
Sanja Vasin ; University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11000 Beograd, Serbia

Abstract

Extreme powerful gear drives have a relatively elastic structure of housing components. The supports and the connections with the carrying structure are not rigid enough either, including this structure itself. The paper analyses the gear unit supporting bearings failure of bucket wheel excavators. The failure of BWE SchRs-1600 occured after a very short service life, in the form of progresive and catastrophic pitting. The presented analysis shows that this phenomenon appeared due to multiple synchronized influences which are a direct consequence of the structure elasticity, the reducer and output shaft masses eccentricity, the moment lever rigidity, and the bearing area local deformations. An improved design solution as well as the mentioned analyses are presented. Additionally, gear transmission units can operate properly in the resonance conditions but they cause very unfavorable effects on other components, such as the bearings. The article contains gear resonance identification and its influence on rapid failure of bearings and other gears of the SRs-1301bucket wheel excavator. Thereafter follows the correction of design parameters of the critical gear pair in order to avoid its resonance and excitation of natural frequencies of gearbox housing.

Keywords

bearings; elasticity; gear drive; pitting; resonance

Hrčak ID:

106687

URI

https://hrcak.srce.hr/106687

Publication date:

21.8.2013.

Article data in other languages: croatian

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