Method for making a multiple density friction material pad

Details Method for making a multiple density friction material pad Method for making a multiple density friction material pad

1999-04-30

2000-12-19

Yao, Sam Chuan

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156227, 156322, 188251R, 188250B, 264258, B32B 3120

Patent

active

061623156

ABSTRACT:
A friction material pad comprises a lamination of stacked sheets, each of which has a top edge forming the friction face that is generally parallel to the direction of relative rotation between the friction pad and an opposing rotary member. Each sheet is formed by a wet paper making process and has a plurality of unwoven fibers, platelets, flakes, or the like, more than half of which are oriented within 45.degree. of perpendicularity to the top edge, the sheets being bound together by a resin binder to form a lamination in which the sheet edges progress from inner to outer sheets to form the friction face of the pad, each sheet having the same blend of friction and lubricating particles, fibers and fillers in a resin matrix. Three groups of sheets are heat aged to different densities and have different friction, hardness and stiffness characteristics. These groups of sheets are combined to provide a monolithic friction material pad having different densities in different areas of the pad to provide a pad having generally uniform wear and friction over the friction face and yet having improved noise attenuation. Thus, a pad can be tailored to any specific application by varying the amount and locations of these different groups of sheets.

REFERENCES:
patent: 5894049 (1999-04-01), Lamport

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