| 摘要 |
An intermediate chain wheel (2) for transmission includes radial spokes (4) pointing radially inwards. Each spoke (4) has two passage holes (5, 6) to allow the fastening of a large chain wheel and of a small chain wheel. Each spoke (4) has a cross-section that decreases progressively in the radially inwards direction and has an elongate slot (7) made between the two holes (5, 6). <IMAGE>
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