Internal-combustion engines – Frame construction – Horizontal cylinder
Reexamination Certificate
2005-12-02
2008-05-06
Cronin, Stephen K. (Department: 3747)
Internal-combustion engines
Frame construction
Horizontal cylinder
Reexamination Certificate
active
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.
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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
Bulloch Clyde A.
Hanner David T.
Horvat Gary L.
Wirkner Kenneth J.
Ali Hyder
Cronin Stephen K.
GM Global Technology Operations Inc.
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