Internal-combustion engines – Vibration compensating device
Patent
1993-03-15
1994-04-19
Kamen, Noah P.
Internal-combustion engines
Vibration compensating device
74574, F02B 7506
Patent
active
053036816
ABSTRACT:
An improved coupling assembly is provided for transmitting rotary power from the working end of an internal combustion engine to a driven shaft. The crankshaft also has a free end connected to an accessory drive train. The coupling assembly comprises a low inertia flywheel having a mass so selected as to cause the node of the first crankshaft mode of torsional vibration to be located in the vicinity of the middle of the crankshaft, and a flexible coupling which interconnects the working end of the crankshaft with the driven shaft. The low inertia flywheel not only reduces the amplitude of the torsional deflection at the free end of the crankshaft, but further raises the primary torsional vibration orders of the engine which excite the coupling assembly by at least one half of an order such that the peak stresses applied to the teeth of the first gear wheel of the accessory drive train are at least halved and are further applied to at least twice as many gear teeth, thereby greatly prolonging the life of the gear wheel. Moreover, the low inertia flywheel further increases the lifetime of the flexible coupling by raising its natural frequency to a level which is substantially higher than the 0.5 engine order of torsional vibration associated with engine malfunction and governor interaction.
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"A Practical Treatise on Engine Crankshaft Torsional Vibration Control" by Robert C. Bremer, Jr., 1979.
SAE Flywheel Standards, p. 30.
G. E. Parker and D. C. Garvey, "Steady-State Speed Osciallation of Internal Combustion Engines", The American Society of Mechanical Engineers Jan. 1972.
Cummins Engine Company, Inc.
Kamen Noah P.
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