US 12,251,655 B2
Cyclonic air filter assembly for an engine
Steven G. Gleixner, Brookfield, WI (US); and Robert Johnson, New Berlin, WI (US)
Assigned to Briggs & Stratton, LLC, Wauwatosa, WI (US)
Filed by Briggs & Stratton, LLC, Wauwatosa, WI (US)
Filed on Jul. 28, 2023, as Appl. No. 18/227,641.
Application 18/227,641 is a continuation of application No. 17/681,130, filed on Feb. 25, 2022, granted, now 11,712,649.
Application 17/681,130 is a continuation of application No. 16/347,953, granted, now 11,260,328, previously published as PCT/US2017/061147, filed on Nov. 10, 2017.
Claims priority of provisional application 62/460,032, filed on Feb. 16, 2017.
Claims priority of provisional application 62/421,098, filed on Nov. 11, 2016.
Prior Publication US 2023/0364540 A1, Nov. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B01D 46/00 (2022.01); B01D 45/16 (2006.01); B01D 46/16 (2006.01); B01D 46/24 (2006.01); B01D 46/48 (2006.01); B01D 50/20 (2022.01); F02M 35/02 (2006.01); F02M 35/022 (2006.01); F02M 35/024 (2006.01); F02M 35/08 (2006.01)
CPC B01D 45/16 (2013.01) [B01D 46/0045 (2013.01); B01D 46/24 (2013.01); B01D 46/2414 (2013.01); B01D 46/48 (2013.01); B01D 50/20 (2022.01); F02M 35/02 (2013.01); F02M 35/0214 (2013.01); F02M 35/0223 (2013.01); F02M 35/02483 (2013.01); F02M 35/08 (2013.01); F02M 35/086 (2013.01); B01D 2265/026 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An air filter assembly, comprising:
a housing including an interior surface that defines an interior volume;
a filter element positioned within the interior volume and including a filter media, wherein the filter element is spaced from the interior surface so that a gap is formed between the filter element and the interior surface to allow air to flow between the filter element and the interior surface;
an air intake formed in the housing;
a debris outlet formed in the housing;
a filtered air outlet formed in the housing; and
a plurality of ribs extending into the interior volume of the housing so that air flowing from the air intake is directed into the gap and around the filter element to complete a cyclonic filtering pass before flowing along a second airflow pass through the filter element, wherein the filtered air outlet is fluidly coupled to an outlet passage that is configured to direct filtered air into a third airflow pass in a direction opposite to the second airflow pass.