| 摘要 |
A flexible bicycle chain comprises a plurality of chain unit, each chain unit including: two inner chain plates; each inner chain plate having a shape like an "8", two outer chain plates; each outer chain plate having a shape like an "8", a size of each outer hole of the outer chain plate being smaller than that of each inner hole of each outer chain plate; a roller unit having a receiving space; a connecting pin received in the receiving space of the roller unit; the connecting pin being longer that the roller unit. Each roller unit includes a middle annular groove, two inclined annular surfaces; the middle annular groove is at a middle section of the roller unit and has a concave cambered shape; and the two inclined annular surfaces are at two ends of the middle annular groove.
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