Apparatus and method for forced response acoustic isolation...

Internal-combustion engines – Frame construction – Horizontal cylinder

Reexamination Certificate

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Reexamination Certificate

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07367304

ABSTRACT:
The present invention provides an improved oil pan that acts as a radiated noise reduction product. More specifically, the invention addresses the case of a broad frequency forced response sound radiation for structurally rigid cast aluminum engine oil pans. The improved oil pan comprises a foam rubber isolating layer coupled to the oil pan and a urethane outer barrier layer coupled to the foam rubber isolating layer. The oil pan has side walls comprised of a plurality of differently-sized flat panels. The vibration isolation takes place locally on the oil pan surfaces, not at the attachments that connect the oil pan to the engine. The net result is a significant reduction in the oil pan radiation efficiency within the desired frequency range of 2 kHz and above.

REFERENCES:
patent: 5271142 (1993-12-01), Moore et al.
patent: 5452693 (1995-09-01), Clark
patent: 6619425 (2003-09-01), Miyakawa et al.
patent: 3706248 (1988-09-01), None
patent: 10302191 (2004-08-01), None

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