| 摘要 |
A elevator drive machine includes a speed reduction unit, a driving sheave, and the first and the second driven sheaves formed over the driving sheave and arranged a triangle with the driving sheave. Each of the sheave has ratchet on its periphery, a pawl mechanism is mounted near the sheave. A speed-limiter which includes a centrifugal speed-limiter engaging with the gear of the first driven sheave and a three-branch lever, is provided on the side of driving sheave and the first driven sheave. When the dropping speed of the cab overruns the given speed, the three-branch lever moves so as to make the ratchet engage with the pawl, thus braking the driving sheave and the first driven sheave, quickly increasing the friction force of driving rope and immediately stopping the cab, it can prevent the rope from sliding on the sheaves, and have advantages of compact construction and low cost.
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