| 摘要 |
An improved coupling assembly includes a polyurethane bushing which cooperates with a friction disc to transmit force. The polyurethane bushing reduces noise caused by components of the coupling assembly and reduces the maximum rate of acceleration between elements of the coupling assembly. The polyurethane bushing has a durometer hardness of approximately 92 Shore A and a Bayshore rebound of 20% to 50%. The maximum rate of acceleration between elements of the coupling assembly is less than 30 times the acceleration of gravity while the coupling assembly transmits a torque load which cyclically varies between at least + 12,500 pound inches and at most -2,500 pound inches during rotation of elements of the coupling at a speed of at least 645 revolutions per minute. During the transmission of the aforementioned cyclically varying torque load by the coupling assembly, peak noise level caused by components of the coupling assembly is less than 103 decibels and is less than 3.0 Pascals.
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