Tribology and Materials | Volume 1 | Issue 3 | 2022 | 87-95
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https://doi.org/10.46793/tribomat.2022.012
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A model formulation for the prediction of churning power loss in worm
gear transmission
Hardik Chothani
1,
Kalpesh Maniya2
1,
Kalpesh Maniya2
1 Government Engineering
College, Bhavnagar, India
2 C. K. Pithawala College of Engineering and Technology,
Surat, India
Abstract: Churning power loss is a complex process that causes
significant loss of energy under splash lubrication of gear units. A set
of empirical equations are available that allows for precise churning
power losses calculation for only the parallel axis gears. The main
objective of this study is to formulate a new mathematical model for
worm gear based on the experiment result. The mathematical model is
formulated using the dimensional analysis method and has been
experimentally validated over a wide range of speeds in terms of
revolutions, types of lubricants, lubricant temperature, and immersion
depths. The simple direct torque measurement method was used to measure
the churning loss. The influence of inertia force, viscous force, and
gravitational forces were also investigated therefore correlations with
Froude and Reynolds numbers are presented. Hardened steel and bronze
were used as a material combination of worm and worm gear, respectively.
A new formula for worm gear under splash lubrication has been derived
and validated by comparison with experimental evidence. A very little
discrepancy was found between the experiment result and the mathematical
equation.
Keywords: churning power loss, lubricant, worm gear,
tribology.
Received: 15-08-2022, Revised: 12-09-2022, Accepted: 12-09-2022
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license, which allows users to distribute, remix, adapt,
and build upon the material in any medium or format for non-commercial purposes only, and only so long as attribution is given to the creator.
2 C. K. Pithawala College of Engineering and Technology, Surat, India
Abstract: Churning power loss is a complex process that causes significant loss of energy under splash lubrication of gear units. A set of empirical equations are available that allows for precise churning power losses calculation for only the parallel axis gears. The main objective of this study is to formulate a new mathematical model for worm gear based on the experiment result. The mathematical model is formulated using the dimensional analysis method and has been experimentally validated over a wide range of speeds in terms of revolutions, types of lubricants, lubricant temperature, and immersion depths. The simple direct torque measurement method was used to measure the churning loss. The influence of inertia force, viscous force, and gravitational forces were also investigated therefore correlations with Froude and Reynolds numbers are presented. Hardened steel and bronze were used as a material combination of worm and worm gear, respectively. A new formula for worm gear under splash lubrication has been derived and validated by comparison with experimental evidence. A very little discrepancy was found between the experiment result and the mathematical equation.
Keywords: churning power loss, lubricant, worm gear, tribology.
Received: 15-08-2022, Revised: 12-09-2022, Accepted: 12-09-2022
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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license, which allows users to distribute, remix, adapt, and build upon the material in any medium or format for non-commercial purposes only, and only so long as attribution is given to the creator.