Multi-disc wet brake packs are commonly used for off-highway applications. Unfortunately when disengaged, these components can create significant levels of unwanted parasitic losses. This paper presents a novel, validated model to predict the parasitic losses in disengaged multi-disc wet brake packs. The model employs pertinent boundary conditions to determine the position of the free boundary created by oil film separation. The experimental and analytical results demonstrate the significance of wet brake disengaged losses at a range of angular velocities, typically found in operation. The improved understanding accrued by the expounded time-efficient methodology presents significant opportunity to develop predictive toolsfor driveline system efficiency calculations and component design optimisation for off-highway vehicles.
Funding
This work was supported by the J.C. Bamford Excavators and Innovate UK.
History
School
Mechanical, Electrical and Manufacturing Engineering
Published in
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Volume
234
Issue
1
Pages
17-27
Citation
MORRIS, N.J. ... et al, 2019. Oil film separation and drag torque in disengaged wet brakes. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 234(1), pp. 17-27.
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/
Acceptance date
2019-03-19
Publication date
2019-04-24
Copyright date
2020
Notes
This paper has been accepted for publication in the journal Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering.