| 摘要 |
1,199,084. Toothed gearing. BORG-WARNER CORP. 2 Oct., 1968 [30 Oct., 1967], No. 46731/68. Heading F2Q. In a composite sprocket or gear-wheel, the teeth are formed by a plastics overlay 25 moulded over tooth root portions 24 formed by serrating, at 23, the peripheral edge of a stamped plate 22 to form segments which are twisted at right angles to the plate 22 to form tooth roots 24, the plastics overlay 25 extending over the whole periphery and tooth roots 24 and extending inwardly to the flat surface of the plate 22. In Fig. 4 (not shown), the tooth roots are strengthened by folding back their outer ends to form double thickness tooth roots (34). The embodiment illustrated in Figs. 5 and 6 (not shown) is similar to that of Figs. 2 and 3 with the addition of a peripheral flange formed by three overlapping folds (45, 46, 47) immediately radially inward of the tooth roots (44). In Fig. 7 (not shown) two stamped metal plates (52) similar to the earlier plate 22 but slightly dished are bolted together at (52a) to form a double width tooth root, providing a more rigid and stronger toothed wheel. In Figs. 8 and 9 (not shown) the intermediate serrated segments (63) are formed into folded double thickness tooth roots (64) whilst the alternate segments (63) are laterally deformed into overlapping folds (66, 67) to form a peripheral series of short flanges (65), the plastics overlay (68) being moulded thereover as before. |
