| 摘要 |
<p>The novel features in a multilayer friction surface for use in torque transfer devices such as friction coupler, synchronisation elements or brakes cooled by a fluid or a lubricant are that (i) the porous sublayer (11, 11') attached to carrier (2) and consisting of cellulose together with synthetic fibres and fillers has a wt. of 200-1500 g/m<2>; and (ii) the upper layer (12) which is of duroplast-bonded fibres (e.g of B, C, fibrillated aramid, glass, minerals or ceramics, esp C) has a higher porosity than layer (11, 11'). Pref. layer (12) has a wt. of 10-120 g/m<2> a thickness of 0.02-0.3 mm and a porosity of 50-95% while sublayer (11) has a thickness of 0.3-2.5 mm end a porosity of only 10-50% (10-20% for synchronisation rings and 40-50% for friction laminates). Sublayer (11) has a duroplast fraction of 20-60 wt.% of its total wt. this duroplast being a phenolic modified resin (resol or novolak), epoxy resin, melamine, silicone resin of acrylic resin, esp. 28-36 wt.% phenolic resol. The filler in layer (11) is absorbent (more than 2.5 times its own wt. of oil) and is esp. a crystalline silicate forming 2-10 (esp. ca.10) wt.% of the layer.</p> |
