| 摘要 |
An oil-free chain is provided to prevent the leakage of lubricating oil between connection pin and bush and between bush and roller without lowering the chain intensity. An oil-free chain includes an inner plate(110), bush(120), roller(130), connection pin(140) and outer plate(150). The inner side of the outer plate is concaved so that the bush projection part partly protruded from the inner plate is coupled to a ring shape recess, expanded and protrudes through the outside surface, and is supported, and The inner side of the inner plate is concaved so that the end of the roller is coupled to a ring shape recess, expanded and protrudes through the outside surface, and is supported.
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