FRICTION FACING COMPRISING A TAPE OF MATERIAL OF AT LEAST ONE STRAND OF GLASS YARN AND AT LEAST ONE STRAND OF ASBESTOS YARN IN SIDE-BY-SIDE RELATIONSHIP

摘要

A friction facing for a clutch, or the like, comprises an annular matrix of at least two yarns, namely an asbestos yarn and a glass yarn, held together by a binder material, and including a reinforcing hoop 22, 24 of glass yarn fibres around the outer and inner periphery of the facing. As shown, the facing comprises two annuli 18, 20 with the hoops 22, 24 between them. The ratio of strands of glass yarn to strands of asbestos yarn may be 1: 2 in the facing 18 and 1:1 in the backing annulus 20. The asbestos yarn 14 may include reinforcing strands of copper, brass or zinc, and the binder material is known rubber-base and thermosetting resin-base varieties. The hoops 22, 24 are formed by treating the yarns with high strength phenolic resin solutions prior to the formation of the hoops and passing them through an oven to remove the solvent. When the hoops are then placed between the annuli 18, 20 and subjected to heat and pressure, the resin converts to a thermoset to bond the hoops to the annuli.