| 摘要 |
A shaft coupling structure includes: a span-ring (20) acting as a friction coupling of main power transmitting means between a drive shaft (7) as a shaft-side member and a brake center (18) as a boss-side member; and mechanical engaging means (30) as auxiliary power transmitting means provided adjacent to the span-ring (20) so as to engage the drive shaft (7) with the brake center (18) when the transmission of the rotary power by the span-ring (20) is insufficient. Accordingly, since the torque transmission is conducted by the mechanical engaging means (30) even when slippage is occurred in the span-ring (20), an optimal transmission torque can be ensured, thereby obtaining sufficient reliability of transmission torque.
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