Multi-stage air filter

Claim 1

In combination with an engine including a blower housing having airflow circulating therethrough, and a carburetor having an intake, an air cleaner assembly comprising: a duct having an inlet and an outlet, said duct inlet being angularly disposed through said blower housing, an air cleaner housing having side walls; a bottom wall; a first interior wall upstanding from said bottom wall and defining with certain ones of said side walls an intake chamber within said housing, said intake chamber having an inlet and communicating with said duct through said duct outlet and said intake chamber inlet; a second interior wall upstanding from said bottom wall, said first and second interior walls and certains other ones of said side walls defining a filter chamber, said filter chamber having an outlet in its bottom wall, and said second interior wall and remaining ones of said side walls defining a passageway, said passageway having an opening connected to an engine crankcase; an outlet chamber having an inlet and an outlet, said outlet chamber being in communication with said filter chamber through said filter chamber outlet and said outlet chamber inlet, and said inlet chamber outlet being in communication with said carburetor inlet; means removably fitted within said filter chamber for filtering airflow passing through said filter chamber and into said outlet chamber; and a cover having side walls and a top wall, and being removably attached to said air cleaner housing, said top wall being spaced above said filtering means and said first and second interior walls so as to define with said filtering means a passageway providing communication between said intake chamber, said filter chamber, and said passageway, whereby the airflow passing through said duct outlet is directed to said intake chamber, then directed horizontally by said passageway, and thereafter being redirected downwardly by said filter chamber.