| 摘要 |
A power transmission device includes a pulley 1 , a hub 2 and a power shut-off member 3 and further includes a cap 4 , one face of which is fastened to an end portion of a rotary shaft 5 by screwing and the other face of which is fastened to the power shut-off member by screwing, so as to transmit power from the power shut-off member to the rotary shaft 5 . Power is transmitted between the rotary shaft and the cap not only by this screw fastening portion but also by utilizing a seat surface B or both seat surfaces A and B, wherein the seat surface A is formed on a forward end face 5 a provided on the rotary shaft and the seat surface B is formed on a screw root portion (an expanded diameter portion) 5 d.
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