Hot Spotting and Judder Phenomena in Aluminum Drum Brakes

[+] Author and Article Information
Kwangjin Lee

Delphi Automotive Systems, Technical Center Brighton, 12501 E. Grand River, Brighton, MI 48116-8326

Frank W. Brooks

Delphi Automotive Systems, Technical Center Dayton, 1435 Cincinnati Steet, Dayton, OH 45408

J. Tribol 125(1), 44-51 (Dec 31, 2002) (8 pages) doi:10.1115/1.1506315 History: Received February 26, 2002; Revised June 26, 2002; Online December 31, 2002
Copyright © 2003 by ASME
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Grahic Jump Location
The number of hot spots and the perceived judder rating increase as the braking speed increases
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Hot spots on aluminum drum D1 after the tests under various braking speeds: (a) after 80.5–56.4 km/h (50–35 mph) snubs (The arrow indicates the direction of the surface tracer used for the data in Fig. 3), (b) after 96.6–72.5 km/h (60–45 mph) snubs; and (c) after 113–88.6 km/h (70–55 mph) snubs.
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Surface profiles traced on the friction surface of aluminum drum D1: (a) surface profile across the area with no hot spot after 96.6–72.5 km/h (60–45 mph) snubs; (b) surface profile across a hot spot after 80.5–56.4 km/h (50–35 mph) snubs; (c) Surface profile across a hot spot after 96.6–72.5 km/h (60–45 mph) snubs; and (d) surface profile across a hot spot after 113–88.6 km/h (70–55 mph) snubs.
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Specific heat and thermal conductivity of the friction material L1
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Stress versus strain curve of the friction material L1. The slope of the linear regression curve is the elastic modulus.
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Longitudinal strain versus transverse strain of the friction material L1. The slope of the linear regression curve is Poisson’s ratio.
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Cross-section of a brake lining and the definition of convex lining surface finish
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Three-segmented friction lining L1
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Friction lining L1 with a circumferential groove (7 mm wide)
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The hot spot formation on a brake drum with grooved linings after 113–88.6 km/h snubs: (a) four spots generated at one side of friction track; and (b) Central spot separated by the nonfrictional strip.



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