Four-stroke internal combustion engine having reduced noise...

Details Four-stroke internal combustion engine having reduced noise... Four-stroke internal combustion engine having reduced noise...

2006-02-15

2008-10-28

Moulis, Thomas N (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

Reexamination Certificate

active

07441532

ABSTRACT:
The present invention provides a four-stroke internal combustion engine having reduced noise emissions. The engine includes a filter element having substantially flat inlet and outlet sides, a first housing portion, and a second housing portion coupled to the first housing portion. The first and second housing portions define an air chamber in which the filter element is supported. The second housing portion includes an interior surface, at least one protrusion to space the inlet side of the filter element from the interior surface, and an air passageway. The outlet of the air passageway is positioned adjacent the interior surface to deliver air to the air chamber between the interior surface and the inlet side of the filter element. A ratio of the volume of the air chamber to the length of the air passageway is between about 5 in2and about 20 in2.

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Briggs & Stratton Illustrated Parts List Model Series 10D900, pp. 5, 9, and 10, Mar. 30, 2005.
Briggs & Stratton Illustrated Parts List Model Series 050000, pp. 6, 12, and 13, Apr. 22, 2005.
Briggs & Stratton Illustrated Parts List Model Series 129700, pp. 4, 13, and 14, Dec. 14, 2005.
Figs. 1-3 illustrate an air cleaner from a Honda Model EU1000i generator commercially available at least as early as 2001.
Figs. 4-6 illustrate an air cleaner from a Honda Model EU2000i generator commercially available at least as early as 2001.
Figs. 7-9 illustrate an air cleaner from a Yanmar Model GA180 engine commercially available at least as early as 2005.
Figs. 10-11 illustrate an air cleaner from a Tecumseh engine commercially available at least as early as 1979.
Figs. 12-13 illustrate an air cleaner from a Mitsubishi Heavy Industries Model No. 245432 engine commercially available at least as early as May 18, 2005.
Figs. 14-15 illustrate an air cleaner cover from a Briggs & Stratton Model 13 engine commercially available at least as early as Aug. 14, 1992.
Figs. 16-17 illustrate an air cleaner cover from a Briggs & Stratton Model 9U and Model 11U engine commercially available at least as early as Nov. 1, 1983.

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