Asbestos free friction element
AssigneeBorg-Warner Corporation
InventorRobert V. Wargin
Life of this patent
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Abstract
Friction elements, particularly those employed in clutch elements, which incorporate fiber strands impregnated with a binder resin wound into a friction element and cured are markedly improved in wear characteristics and burst strength when the fiber strands are formed of a combination of glass, acrylic fiber and metallic filament. The fiber strands, twisted into a yarn and plied to form a composite yarn of opposing twist, contribute greatly to improved performance, particularly better fade resistance and engagement response, together with high burst strength.
Claims5
In a friction element adapted for use in a clutch, said friction element comprising fiber strands impregnated with a binder resin composition and disposed in an undulating fashion and then cured to form a disc-shaped facing, the improvement wherein said fiber strands are in the form of a plied yarn comprising from about 30 to about 70 wt. % glass fiber, from about 15 to about 25 wt. % acrylic fiber and from about 15 to about 45 wt. % metallic filament.
A plied yarn adapted for use in the manufacture of friction elements, said plied yarn comprising from about 30 to about 70 wt. % glass fiber, from about 15 to about 25 wt. % acrylic fiber and from about 15 to about 45 wt. % metallic filament, wherein said plied yarn having a helical twist of from 50 to 120 turns per meter and comprising a plurality of twisted yarns having a helical twist of from 50 to 120 turns per meter opposite in direction to the twist direction of the plied yarn.
Dependencies are inferred from the claim text.