| 摘要 |
An adjustless V-belt and method of manufacture. The V-belt comprises: a compressive rubber layer made of a heatproof or coldproof rubber and an adhesion rubber layer laminated on said compressive rubber layer. A group of cogs protrude from said adhesion rubber layer with a predetermined pitch and depth and a longitudinally stretchable cover canvas covers the cogs, and the roots between said cogs. Rope tensile members are embedded between the adhesion rubber layer and the group of cogs with a regular pitch line and in the cylindrical state such a manner that parts of the tensile members are in contact with said cover canvas. The rope tensile members have a high thermal contraction stress of at least 3.5 g/denier which is the differential between a thermal contraction stress at 100 DEG C. and that at room temperature (about 20 DEG C.). Short fibers are embedded in the compressive rubber layer in such a manner that the short fibers are orientated laterally therein. A ply of rubberized canvas is bonded, in lamination, to the lower surface of the compressive rubber layer. A reversal molding technique is used with the cover canvas first wound around a metal mold having protrusions and grooves followed by the rope tensile member, the adhesion rubber sheet, the compressive rubber sheet and finally the rubberized canvas. A cylindrical sleeve is placed over the belt blank thus formed and the assembly is pressurized and heated to permit a portion of the adhesion rubber to fill the grooves in the metal mold.
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