By David Barton
A set of topical papers on automobile brakes from a convention prepared via the Yorkshire Centre of the car department of the IMechE. The convention all for the most recent improvement and seeked to deal with the most important difficulties dealing with the not easy department of automobile engineering.
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Additional info for Brakes 2000: Automotive Braking Technology for the 21st Century
3 New geometries and their grade of efficiency With geometric shapes used in current series applications it sometimes happens that the brake pad tilts relative to the brake piston. This means that the contact area between brake piston and damping shim or gliding sheet reduces to an extended contact at three places. At these reduced contact areas the pressure becomes very high. Having an elastomer coating at such contact areas it will be abrased fast due to this high pressure, mostly combined with vibrational motions.
Figure 7 shows the results of the characteristic steps of this development. 26 Figure 7: Test results 27 Initially - without noise insulator - the brake was very noisy, refer to the frequency of occurrence as well as the high level of the brake squeal. 5 to 9 kHz and reached levels up to 110 dB[A]. All tests were run according to a standard noise search program, so from the temperature curve it becomes obvious that the high-level noise occurred especially when driving alternately forward and reverse with generally decreasing brake disc temperature.
These are discussed below. The most obvious effects originating from the passage of the grit-blasted sector between the pads were the squeal inhibition and the decrease in friction coefficient during the end of and just after the passage. e. e. the trailing edge of the pad had passed the leading edge of the sector). e. when the whole pad had reached the untreated disc surface). At the higher speed, the vibration of the pad increased very rapidly when resuming the squealing contact conditions. Generally, this increase was faster than the decrease when the sector entered between the pads.