This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Effect of Cu2S Solid Lubricant Addition, and Varying Density, on the Occurrence of Brake Squeals for One Low-Metal, Organic Type Brake Pad
Technical Paper
1999-01-3394
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Brake pads with an especially formulated, low-metal organic friction material were tested in a rig especially developed for brake squeal tests. The effect on squeal generation by the addition of 0, 2, 4, 8 and 12 vol% Cu2S to the friction material was investigated. All tests were performed at low speeds, moderate to low brake pressures and with disc temperatures in the range of 70-270 °C. It was found that the addition of Cu 2S consistently reduced the number of generated squeals, with an optimum around 4-8 vol% addition. Further, the addition of Cu2S also lowered the coefficient of friction for the present friction material formulation. A friction minimum was obtained at 8 vol% Cu2S. Included in this investigation were three sets of pads, all containing 8% Cu2S, but with different densities. It was found that the pads with the higher density generated fewer squeals than did the pads with the lower density. Within the limits of the test, there was a definite trend for pads with higher friction to generate more brake squeals.
Recommended Content
Authors
Citation
Bergman, F., Eriksson, M., and Jacobson, S., "The Effect of Cu2S Solid Lubricant Addition, and Varying Density, on the Occurrence of Brake Squeals for One Low-Metal, Organic Type Brake Pad," SAE Technical Paper 1999-01-3394, 1999, https://doi.org/10.4271/1999-01-3394.Also In
References
- Crolla D. A. Lang A. M. “Brake Noise and Vibration - The State of the Art” Leeds-Lyon Symposium on Tribology 17 1990 Vehicle tribology 165 174 Dowson D. Taylor C. M. Godet M. Amsterdam Elsevier 1991 Tribology series 18 1991
- Dihua G. Dongying J. “A Study on Disc Brake Squeal using Finite Element Methods” SAE Paper 980597 1998
- Daudi A. W. “Hayes Quiet Rotor Design” SAE Paper 982249 1998
- Parin M. L. “Constrained Layer Viscoelastic Vibration Damping” SME Technical Paper , AD89-551 1989 1 19
- Lang A. M. Smales H. “An approach to the solution of disc brake vibration problems” IMechE 1983 223 231
- Hoffman C. T. “Damper design and development for use on disc brake shoe and lining assemblies” SAE Technical Paper Series 880254 1988
- Lewis T. M. Shah P. “Analysis and Control of Brake Noise” SAE Paper 872240 1987
- Bergman F. Gudmand-Høyer L. Eriksson M. Jacobson S. “The effect of Cu2S, PbS, Sb2S3 solid lubricants on the occurence of brake squeals for three automotive brake pad matrix types” Nordtrib'98, Proc. of the 8th Int. Conf. on Tribology DTI Tribology Centre Aarhus, Denmark 1998
- Bergman F. Eriksson M. Jacobson S. “A Software Based Measurement System for Test and Analysis of Automotive Brake Squeal” TriboTest 5 3 1999
- A/S. Roulunds Fabriker “UDVIKLING AF FRIKTIONSMATERIALER SKIVEBREMSEBELÆGNINGER” Unpublished 1997
- Eriksson M. Bergman F. Jacobson S. “Surface characterisation of brake pads after running under silent and squealing conditions” Wear 232 1999 232 2 163 167