Motor vehicles – Power – Hoods
Patent
1979-10-10
1982-06-22
Peters, Jr., Joseph F.
Motor vehicles
Power
Hoods
52473, 98121R, 165135, 181204, 181211, 181257, B62D 2510, F01N 700, G10K 1116
Patent
active
043357970
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a noise suppresion arrangement adapted to be mounted on an engine enclosure of a vehicle for absorbing at least substantially all of the acoustical energy emanating therefrom.
BACKGROUND ART
Internal combustion engines and their accessories, such as an engine-driven cooling fan, emit an appreciable amount of noise or acoustical energy during operation thereof. Such energy is commonly measured by its level of intensity and its frequency range with the human being highly sensitive to frequencies in the range of from 800 Hz to 3,000 Hz. One approach to the dampening-down of the noise to an acceptable level is to provide the engine enclosure with a plurality of louvers mounted on one or more sides thereof with the louvers including acoustical material in the form of pads.
Although the louvers function efficiently to absorb a portion of the acoustical energy emitted from the engine, a substantial portion thereof is free to pass through airflow passages, necessarily defined between the louvers to permit ambient air to ingress into the engine enclosure for cooling purposes. In particular, the louvers are normally not constructed and arranged to be optically dense, when viewed from within the engine enclosure and only intercept and absorb a portion of the sound waves which represent the acoustical energy or noise.
In addition, conventional louver arrangements of the above type are somewhat bulky and exhibit relatively high space to sound absorption efficiency ratios.
DISCLOSURE OF INVENTION
The present invention is directed to overcoming one or more of the problems as set forth above.
In one aspect of this invention, an engine enclosure for a vehicle is provided with at least one noise suppression arrangement, including sound attenuating means for permitting the ingress of ambient air into the enclosure and for intercepting, reflecting, and absorbing at least substantially all of the sound waves emanating from within the enclosure by at least substantially providing an optically dense view from within the enclosure, exteriorly thereof.
The sound attenuating means includes a spaced plurality of acoustical energy absorption means for directly intercepting and absorbing a substantial portion of the sound waves and a plurality of separate sound reflecting means, each having ends positioned outwardly from and between each adjacent pair of sound absorption means, for providing an unobstructed passage to permit ambient airflow therethrough and to provide the above optically dense view to reflect and absorb at least substantially all of the remaining portions of the sound waves.
The sound attenuating means of this invention thus provides for the efficient absorption of acoustical energy and exhibits a compact and narrow profile adapting it for limited space requirements to provide a relatively low space to sound absorption efficiency ratio.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects of this invention will become apparent from the following description and accompanying drawings wherein:
FIG. 1 is an isometric view illustrating an engine enclosure having a noise suppression arrangement embodiment of the present invention, mounted on either side thereof;
FIG. 2 is a sectional plan view, taken in the direction of arrows II--II in FIG. 1, illustrating the interior of the engine enclosure and the disposition of a noise suppression arrangement on either side thereof;
FIG. 3 is an enlarged, transverse sectional view through a portion of the noise suppression arrangement, taken in the direction of arrows III--III in FIG. 1;
FIG. 4 is a view similar to FIG. 3, but illustrates a second noise suppression arrangement embodiment of the present invention; and
FIG. 5 is also a view similar to FIG. 3, but illustrates a third noise suppression arrangement embodiment of the present invention.
BEST MODE OF CARRYING OUT THE INVENTION
FIGS. 1 and 2 illustrate an engine enclosure 10, having an internal combustion engine 11 mounted therein. The engine is cooled in a conventional manner
REFERENCES:
patent: 1323978 (1919-12-01), Gebhardt
patent: 1865677 (1932-07-01), Cheyney
patent: 2855039 (1958-10-01), Gross
patent: 3762489 (1973-10-01), Proksch et al.
patent: 3857453 (1974-12-01), Buttke et al.
patent: 3923114 (1975-12-01), Suzuki
patent: 3982600 (1976-09-01), Gerresheim et al.
Caterpillar Tractor Co.
Peters Jr. Joseph F.
Smith Milton L.
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