| 摘要 |
A power transmission apparatus including a pulley and a hub coupled to the pulley is disclosed. An internally threaded portion formed in a hub center hole is screwed with an externally threaded portion of a rotary shaft thereby to couple the pulley to the rotary shaft. The apparatus further includes a seal member for sealing the hub center hole. The seal member includes a fixed portion having a fitting hole fitted on the forward end portion of the rotary shaft and a flange portion extending in radial direction and adapted to form a contact seal portion surrounding the hub center hole with the hub.
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