Method of evaluating a disc brake rotor

Details Method of evaluating a disc brake rotor Method of evaluating a disc brake rotor

2006-05-25

2008-10-21

McCall, Eric S (Department: 2855)

Measuring and testing

Brake testing

Reexamination Certificate

active

07437917

ABSTRACT:
A method for determining local departures of opposed friction surfaces that are spaced apart in parallel planes normal to the axis of the rotor. Displacement sensing probes are placed in opposing alignment adjacent the friction surfaces and rotor is spun. Instantaneous distances from each probe to the friction surfaces is made by repetitively sampling and converting the sample distances into digital form. The differences between contemporaneous sample distances are computed to determine rotor thicknesses and displayed. An analog measure of the instantaneous angular rotor position is provided for each instantaneous angular position. The angular rotor position and distance measures are correlated and the angular rotor position sample converted to digital form. While the time interval between successive distance samples is constant the rotor angular velocity may vary during a revolution and spline-based interpolation between successive distance samples is performed to obtain to obtain a representation of equiangularly spaced sample values.

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patent: 2005/0049823 (2005-03-01), Link et al.
patent: 2006/0032347 (2006-02-01), Newell et al.

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