| 摘要 |
<p>An adjustable V-belt comprises a compressive rubber layer (2) onto which an adhesion rubber layer (3) is laminated, the adhesion rubber layer (3) having a plurality of ridges (4) on a surface thereof remote from the compressive rubber layer (2) which extend transversely of the V-belt. A canvas covering (5) covers the ridges (4) and the recesses defined therebetween, and is stretchable longitudinally of the V-belt. Elongate tensile portions (6) are embedded between the adhesion rubber layer (3) and the ridges (4) so that they contact portions of the canvas covering (5) which are disposed in said recesses. The tensile portions (6) extend longitudinally of the V-belt in mutually parallel, equi-spaced relation, and have a differential thermal contraction stress between 100 DEG C and 20 DEG C of at least 3.5g/denier. At least one ply of rubberized canvas (7) or a rubber sheet can be laminated onto a surface of the compressive rubber layer (2) remote from the adhesion rubber layer (3), and short fibres (8) can be embedded in the compressive rubber layer (2) so as to be oriented transversely of the V-belt. The V-belt is manufactured by winding the canvas covering (5), the tensile portions (6), the adhesion rubber (3a), the compression rubber (2a) and the rubberized canvas (7) in succession around an outer wall of a cylindrical metal mould (11) which has circumferentially spaced protrusions (12) extending axially thereof. The tensile portions (6) are formed by spirally winding a rope-like tensile member around the mould (11), the tensile member being subjected to a thermal elongation treatment. The resultant belt blank is then pressurized and heated, causing some of the adhesion rubber (3a) to flow between the windings of the tensile member (6) and into grooves (13) defined between the protrusions (12), thereby forming the ridges (4) in the finished V-belt. </p> |
