YANG Linjie,ZHANG Bohan,CHEN Huixiao,et al.Analysis of splash lubrication cooling characteristics in urban rail transit train gearbox[J].Journal of Mechanical Transmission,XXXX,XX(XX):1-9.
YANG Linjie,ZHANG Bohan,CHEN Huixiao,et al.Analysis of splash lubrication cooling characteristics in urban rail transit train gearbox[J].Journal of Mechanical Transmission,XXXX,XX(XX):1-9.DOI:
Analysis of splash lubrication cooling characteristics in urban rail transit train gearbox
The gear drive device of urban rail trains adopts splash lubrication method. To study the influence of lubrication and cooling characteristics on the transmission efficiency and service life of gearboxes under splash lubrication mode
reveal its coupling mechanism
and meet the engineering application development needs of transmission systems.
Methods
2
Firstly
based on the improved semi implicit method of moving particles
a simulation model of the splash lubrication flow field in the gearbox was constructed
and a second-order least squares model was introduced to improve the calculation accuracy; Secondly
a thermal flow coupled temperature field simulation model of the gearbox was established by combining the thermal network method and finite element method. The focus was on studying the influence of the input speed and initial oil level height of the gearbox on the oil stirring power and system lubrication and cooling characteristics. The accuracy of the temperature field simulation prediction model of the gearbox was verified through tests.
Results
2
Results indicate: oil churning power loss increases exponentially with rotational speed; the gearbox convective heat transfer coefficient continuously increases with rising oil level
the larger the convective heat transfer coefficient
improving system cooling performance; minimal temperature rise in gears and bearings occurs at 1 900 r/min with medium oil level (262 mm below low-speed wheel centerline); simulated bearing and oil sump temperatures align with test data
with relative error below 8%. This research provides theoretical foundations for optimizing urban rail train gearbox design
offering significant engineering value for ensuring subway operational safety.
关键词
Keywords
references
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