Durability of Reduction Gearbox for Bimodal Tram propelled by Series Hybrid Propulsion

초록

The test code and the test bench for durability were made to verify the design validity of the reduction gearbox for series type CNG hybrid propulsion system. Considering the required traction efforts and vehicle speed for the bi-modal tram, the revolution speed and the load in the time domain (1 cycle: 700sec) were defined for the durability tests of the reduction gearbox. After durability test was performed for 1,029 cycles (about 200 hours) continuously in the test bench, the reduction gearbox was investigated to maintain the aimed performance and expected life span (wearing) in its bearings and gearings. Additionally, behaviors at over speed condition (output speed 88km/h) and power transmission efficiency at nominal operation condition were analyzed. The test results in the test bench have verified that the reduction gearbox had durability and performance for the series type CNG hybrid propulsion of the bi-modal tram.