| 摘要 |
The invention relates to a plastic injection-molding method for producing a poly-V belt pulley (1), which has an outer ring, an inner ring (7), and a ring web (8), which connects the outer ring to the inner ring and has a plurality (r) of radially oriented ribs (9). The injection molding occurs in a circular-ring-shaped injection-molding cavity, a poly-V-ribbed inner shell of which is formed by a plurality (s) of radially movable slides (s1 to s11) and which is vented during the injection molding by means of the gaps between the slides adjacent to each other. The rib contour in the injection-molding cavity should be designed in such a way that the plurality of ribs consists of a first group of thin ribs (9-1) and a second group of thick ribs (9-2) and that the gaps extend in radial extension of the thin ribs, the width (w1) of which is significantly less than the width (w2) of the thick ribs, which extend circumferentially between the gaps. |
