Oil film separation and drag torque in disengaged wet brakes
journal contributionposted on 2019-04-05, 10:29 authored by Nick MorrisNick Morris, James A. Davies, Michael Leighton, Paul KingPaul King, Homer Rahnejat
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.
This work was supported by the J.C. Bamford Excavators and Innovate UK.
- Mechanical, Electrical and Manufacturing Engineering
Published inProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
CitationMORRIS, 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.
- AM (Accepted Manuscript)
Rights holder© IMechE
Publisher statementThis 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/
NotesThis paper has been accepted for publication in the journal Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering.