Importance

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Abstract

In a generally annular clutch facing comprising a fibrous substrate embedded in a matrix of a cross-linked polymeric binder, the improvement in which said fibrous substrate comprises 100 parts by weight of rock wool, from 10 to 50 parts by weight of organic fiber and from 5 to 50 parts by weight of glass fiber in the form of yarn, roving, strand or code, or in the form of fabric made of such yarn, roving, strand or code, and in a generally annular clutch facing comprising a fibrous substrate in the form of woven fabric embedded in a matrix of a cross-linked polymeric binder with warp yarns of the fabric extending circumferentially of the clutch facing, the improvement in which the warp yarns of the fabric contain glass fiber, and weft yarns of the fabric contain rock wool. The clutch facings according to the invention have great tensile strength, and do not suffer from a problem of judder which is felt by a driver as vibration during operation.

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First Claim