Disc brake
AssigneeAllied Corporation
InventorJames H. Tarter
Life of this patent
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Abstract
A disc brake (10) having friction pads (42) and (44) whose arcuate foot prints (80, 82, 84) on a rotor (12) is les than a nodal diameter of a frequency that would create an undesirable noise during a brake application.
Claims5
In a disc brake having a caliper member for urging first and second pads into engagement with a rotor to effect a brake application, said rotor having a pattern of nodes corresponding to a natural frequency associated with an oscillation condition, characterized by said first and second pads defining first and second operational areas, respectively, that are offset each other and engage opposite surfaces on said rotor, said first and second operational areas having an arcuate length which is less than an arcuate length between nodes corresponding to a frequency mode of said rotor which could create undesirable noise during a brake application, said offset preventing said first and second operational area from totally operating in the same nodal diameter to further reduce the development of noise, said arcuate length being more than five but less than ten nodal diameters of said rotor.
A method of selecting a disc brake pad for use with a caliper member having a piston that urges the brake pad into engagement with a rotor, comprising the steps of:
- exciting a rotor to develop resonant frequencies therein;
- measuring the resonant frequencies of the rotor to determine the natural frequencies corresponding to modes having nodal diameter;
- and
- choosing the accurate length of the brake pad as a function of the whole nodal diameter associated with an axial frequency above 7000 kHz.
Dependencies are inferred from the claim text.