| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight drive roller chain wherein the shape of a link plate is optimized to minimize its weight. SOLUTION: An outer plate 4 includes a substantially rectangular outer window 11 formed between a pair of link pin holes. An inner plate 7 includes a substantially rectangular inner window 10 formed between a pair of bush holes 5. Corners of the outer window and the inner window are rounded. The outer plate 4 and the inner plate 7 are respectively provided with circular arc parts at both lengthwise ends and sides 42, 72 generally linearly extending from the circular arc parts toward the lengthwise centers and outwardly in the widthwise directions of the outer plate and the inner plate. The sides 42, 72 are so arranged as to extend inwardly with respect to the tangent directions at the ends of the circular arc parts 41, 71 of the outer plate 7. In the outer plate and the inner plate, a high-carbon chromium bearing-steel is treated with austempering process. COPYRIGHT: (C)2008,JPO&INPIT
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