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Oil film separation and drag torque in disengaged wet brakes

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journal contribution
posted on 05.04.2019, 10:29 by Nick Morris, James A. Davies, Michael Leighton, Paul 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.

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.

Publisher

SAGE Publications

Version

AM (Accepted Manuscript)

Rights holder

© IMechE

Publisher statement

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

19/03/2019

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.

ISSN

0954-4070

eISSN

2041-2991

Language

en

Exports