Hybrid elastomer-and-metal spring isolator

Details Hybrid elastomer-and-metal spring isolator Hybrid elastomer-and-metal spring isolator

1996-03-19

1997-09-16

Butler, Douglas C.

Spring devices

Vehicle

Compound

2671404, 267152, 2671402, F16F 310

Patent

active

056672020

ABSTRACT:
A hybrid elastomer-and-metal spring isolator with a low natural frequency. A fully bonded sandwich mount has cored pockets that receive metal coil springs. Extruded cavities on the lower and upper plates of the sandwich mount extend into the pockets within the interior of the coiled springs and receive a tension bolt and double lock-nut assembly to secure the separate lower cavities to the isolator. A preload retention nut engages a protruding portion of the tension bolt and preloads the coil springs to an amount equal to their static load. This hybrid isolator has particular application in mounting large (30 ton) diesel engines; the isolator assembly provides a natural frequency that is between 3 and 5 Hz, outside the normal idling frequencies of the engine so as to avoid resonance.

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