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Air cleaner for crankcase ventilation system

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Publication number
US3589108A
US3589108A US3589108DA US3589108A US 3589108 A US3589108 A US 3589108A US 3589108D A US3589108D A US 3589108DA US 3589108 A US3589108 A US 3589108A
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Grant
Patent type
Prior art keywords
air
filter
crankcase
system
engine
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Inventor
Ronald J Dingel
Wesley D Tomlinson
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Motors Liquidation Co
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Motors Liquidation Co
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02Air cleaners
    • F02M35/024Air cleaners using filters, e.g. moistened
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00Crankcase ventilating or breathing
    • F01M13/02Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F01M13/022Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
    • F01M13/023Control valves in suction conduit
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel, or fuel-air mixture
    • F02M25/06Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel, or fuel-air mixture adding lubricant vapours
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Technologies for the improvement of indicated efficiency of a conventional ICE
    • Y02T10/121Adding non fuel substances to fuel, air or fuel/air mixture

Abstract

An air cleaner for a closed positive crankcase ventilation system includes an air filter having a pleated filter element which has an enlarged pleat outwardly surrounding the air intake for the ventilation system and a cylindrical filter element disposed inwardly of the pleats and defining with the enlarged pleat a filtering chamber in which the air flowing through the ventilation system to the crankcase during normal engine operating conditions is filtered by the enlarged pleat and the excess blowby gases and crankcase vapors flowing from the crankcase to engine carburetor during high-speed operation of the engine are filtered by the cylindrical filter element.

Description

United States Patent 3,033,030 5/1962 Heller Inventors Ronald J. Dingel Warren; Wesley D. Tomlinson. Rochester, both of, Mich. Appl. No. 826,374 Filed May 21, 1969 Patented June 29, 1971 Assignee General Motors Corp.

Detroit, Mich.

AIR CLEANER FOR CRANKCASE VENTILATION SYSTEM 2 Claims, 4 Drawing Figs.

US. Cl 55/482,

55/498, 123/1 19. 55/510 Int. Cl B0ld 27/06 Field 01' Search 55/482,

References Cited UNITED STATES PATENTS 3,186,391 6/1965 Kennedy 55/482 3,277,876 10/1966 Abts 55/510 3.450.117 6/1969 MCHattie .4 55/510 FOREIGN PATENTS -900,450 7/1962 Great Britain 55/486 Primary Examiner-Frank W. Lutter Assistant ExaminerBernard Nozick Attorneys-S. Carter and P. A. Taucher ABSTRACT: An air cleaner for a closed positive crankcase ventilation system includes an air filter having a pleated filter element which has an enlarged pleat outwardly surrounding the air intake for the ventilation system and a cylindrical filter element disposed inwardly of the pleats and defining with the enlarged pleat a filtering chamber in which the air flowing through the ventilation system to the crankcase during normal engine operating conditions is filtered by the enlarged pleat and the excess blowby gases and crankcase vapors flowing from the crankcase to engine carburetor during high-speed operation of the engine are filtered by the cylindrical filter element.

AIR CLEANER FOR (IRANKCASE VENTILATION SYSTEM Recently, legislation has been enacted requiring internal combustion engines of motor vehicles to be equipped with a closed positive crankcase ventilation system. Basically, this system incorporates two flow paths between the engine induction system and the engine crankcase. An outlet flow path fluidly connects the crankcase and the engine intake manifold and handles the removal of vapors and blowby gases which tend to collect in the crankcase by drawing them into the induction system with the vacuum normally formed by the operation of the engine. An intake flow path fluidly connects the air cleaner and the crankcase and functions to admit fresh air to the ventilation system. Under normal operating conditions, the outlet flow path can adequately handle the vapors and blowby gases present in the crankcase without upsetting the air-fuel ratio to the engine. However, under rapid ac celeration or high-speed operating conditions, the intake manifold vacuum is insufficient to completely vent the blowby gases in the crankcase and the excess volume reversely flows through the intake flow path to the air cleaner.

In the past, two basic methods, clean side" and "dirty side" filtration, have been used in the closed positive crankcase ventilation systems. The dirty side filtration system has an inlet for the intake flow path which is upstream or exterior of the air cleaner filter. With this method, the reverse flow of crankcase vapors and blowby gases under high-speed operating conditions is filtered prior to entering the induction system thereby eliminating the problem of carburetor clogging and malfunctioning caused by deposited contaminants. However, without a supplemental filter, the flow of road" dust and other contaminants into the crankcase is not controlled. The clean side" filtration method positions the inlet for the intake flow path internal or downstream of the air filter. While this method does not filter the flow of crankcase vapors and blowby gases to the carburetor, it does limit the amount of road" dust and contaminants delivered to the crankcase.

The present invention contemplates providing a closed positive crankcase ventilation system for positively filtering the flow of vapors between the air cleaner and the crankcase under all operating conditions while, at the same time, providing a system compatible with current filter and air cleaner constructions. In the accomplishment of this objective, the air cleaner filter includes an accordion-pleated filtering element having a single enlarged pleat which radially outwardly encircles the inlet of the intake flow path. A cylindrical filtering element is disposed inwardly of the pleats and defines with the enlarged pleat a sealed filtering chamber which is fluidly connected to the crankcase. Under normal engine operating conditions, air flowing inwardly to the chamber is filtered by the enlarged pleat before entering the crankcase and the induction system. Under engine operating conditions of high-speed or sudden acceleration, the excess blowby gases reversely flowing through the intake flow path are filtered by the cylindrical filter element before entering the induction system. Thus, the air entering the carburetor in the present closed positive crankcase ventilation system is positively filtered for all modes of engine operation thereby combining the advantages of both clean side" and "dirty side" crankcase filtration.

Accordingly, it is an object of the present invention to provide an air cleaner for a closed positive crankcase ventilation system of an internal combustion engine wherein both clean side" and dirty side crankcase filtration are achieved by a novel modification of the air filter.

Another object of the present invention is to provide an air filter for an air cleaner used in a closed positive crankcase ventilation system wherein the filter includes an enlarged pleat which partially surrounds the air intake to the ventilation system and serves to filter air entering the crankcase under normal engine operating conditions, the filter further includ ing an inner filtering element disposed across the enlarged pleat which serves to filter excess blowby gases flowing from the crankcase to the engine induction system during highspeed operation.

Another object of the present invention is to provide an air cleaner for a closed positive crankcase ventilation system wherein an accordion-pleated filter element includes a single enlarged pleat which outwardly surrounds the air intake for the ventilation system for filtering air flowing to the crankcase during normal engine operating conditions thereby providing "clean side crankcase filtration and a cylindrical filter element disposed across the enlarged pleat for filtering excess blowby gases from the crankcase to the engine induction system during high-speed engine operation thereby providing "dirty side crankcase filtration.

These and other objects will be apparent to one skilled in the art upon reading the following detailed description, reference being made to the accompanying drawings in which:

FIG. 1 is a partially sectioned elevational view of an internal combustion engine having a closed positive crankcase ventilation system which incorporates an air cleaner made in accordance with the present invention;

FIG. 2 is an enlarged view taken along line 2-2 of FIG. 1;

FIG. 3 is an enlarged view ofa portion of FIG. 2; and

FIG. 4 is a view taken along line 44- of FIG. 3.

Referring to FIG. 1, an internal combustion engine 10 includes a crankcase 12 and an induction system 14 comprising an air cleaner 16, a carburetor 18, and an intake manifold 20. A pair of rocker arm covers 22 and 24 are fastened atop engine cylinder banks 26 and 28, respectively, and define rocker chambers 30 and 32. An intake pipe 34 fluidly connects the rocker chamber 32 with the interior of the air cleaner 16 and an outlet pipe 35 fluidly connects the :rocker chamber 30 with the intake manifold 20. The outlet pipe 35 is provided with a positive crankcase ventilation valve 36 of the type shown and described in Pittsley US. Pat. No. 3,359,960, assigned to the assignee of the present invention, wherein the valve serves to regulate the flow of blowby gases from the crankcase 12 so as not to upset the air-fuel ratio of the engine under low-load conditions. The pipes 34 and 35 form the flow paths for a closed positive crankcase ventilation system wherein a portion of the air entering the air cleaner 16 passes through the pipe 34 to the rocker chamber 32 and into the crankcase 12 through various passageways within the interior of the engine 10. This air mixes with vapors in the crankcase and blowby gases which are blown past the engine pistons into the crankcases. Thereafter, these gases flow outwardly through internal engine passageways and the rocker chamber 30 to the intake manifold 20 via the outlet pipe 35.

Referring to FIG 2, the air cleaner 16 includes a housing formed by an upper member 37 and a lower member 38. The lower member 38 includes a central opening forming an air outlet 39 defined by a rim 40 which is disposed in a counterbore formed in the upper end of the air inlet horn 42 of the carburetor 18. The lower member 38 further includes an upwardly opening peripheral channel 44 in which a resilient gasket 46 is disposed. The upper member 37 includes a circular lid 48 having a downwardly depending circular sidewall 50 that terminates in an annular rim 52 which sealingly engages the gasket 46. A bolt 54 is secured at a lower end to the inlet horn 42 and has a threaded upper end which extends through a central aperture in the lid 48. A wing nut 56 is threaded on the bolt and, when tightened, serves to hold the upper member 37 and the lower member 38 securely against the air horn 42. An air inlet tube or snorkel 58 is secured around a port 60 formed in the sidewall 50 to form an air inlet passage to an air distribution and acoustical capacitance chamber 61 for the air induction system 14.

An air filter 62 for filtering the air entering the induction system 14 is disposed interior of the housing. The filter 62 includes plastisol end caps 64 and 66 which are sealingly retained in annular seats 67 and 68 formed in the upper housing member 37 and the lower housing member 38. As shown in FIGS. 3 and 4, the filter 62 includes a first filter element 70 formed of an oiled paper construction and comprising a circumferentially spaced series of pleats 71. A second cylindrical filter element 72 formed of a resin-treated paper is disposed interiorly across the inwardly facing tips 74 of the first filter element 70. The ends of the filtering elements 70 and 72 are formed or otherwise embedded in the end caps 64 and 66 to form the illustrated unitized filter. As shown in FIGS. 3 and 4, the filter element 70 includes a single enlarged generally U- shapcd pleat 76 which, in cooperation with the second filtering element 72, forms a sealed filtering chamber 78. The intake pipe 34 extends through the lower member 38 into the interior of the air cleaner 16 with an upper end 80 extending into and registering with the filtering chamber 78 through an aperture 82 formed in the end cap 66.

Under normal engine operating conditions, the air flows inwardly through the snorkel 58 and is filtered by the first filter element 70 and the second filter element 72 before entering the carburetor 18 and induction system 14. A portion of the entering air is filtered by the enlarged pleat 76 before passing downwardly through the rocker chamber 30 to the crankcase 12. This air mixes with the crankcase vapors and blowby gases and the resultant mixture is routed to the intake manifold via the outlet pipe 35. Under high-speed operation or sudden acceleration of the engine, an excessive amount of blowby gases flow past the cylinders to the crankcase 12. in certain instances, the volume of gases cannot be handled by outlet pipe 35 and a portion reversely flows through intake pipe 34 into the filtering chamber 78 where they are filtered by the second filter element 72 prior to entering the engine induction system 14. Thus, under all modes of engine operation, the flow of air to the carburetor l8 and the crankcase 12 is filtered thereby avoiding the intake and accumulation of contaminants and, in this manner, provide both dirty side" and clean side" crankcase filtration by the unique air cleaner and filter construction described above.

Although only one form of this invention has been shown and described, other forms will be readily apparent to those skilled in the art. Therefore, it is not intended to limit the scope of this invention by the embodiment selected for the purpose of this disclosure but only by the claims which follow.

What we claim is:

1. An air cleaner adapted for use in a closed positive crankcase ventilation system on an internal combustion engine induction system wherein the air cleaner comprises: a housing formed by an upper member and a lower member, said housing having an air inlet and an air outlet spaced therefrom and adapted to register with the induction system of said engine; an air filter positioned between the air inlet and air outlet having spaced annular end caps disposed interior of said housing with said end caps sealingly engaging said upper member and said .lower member, said filter including a first annular accordion-pleated filter element bonded to said end caps having one enlarged pleat, and a second cylindrical filter element disposed within said first-mentioned filter element and in abutment therewith and bonded to said annular end caps to make up a unitized filter and form a filtering chamber with said one pleat, an aperture formed in said housing and in one of said end caps with said aperture being within said one enlarged pleat and in registration with said filtering chamber.

2. An air cleaner adapted for use in a closed positive crankcase ventilation system on an internal combustion engine induction system wherein the air cleaner comprises: a housing formed by an upper member and a lower member, said housing having an air inlet and an air outlet spaced therefrom and adapted to register with the induction system of said engine; an air filter positioned between the air inlet and air outlet having spaced annular end caps disposed interior of said housing with said end caps sealingly engaging said upper member and said lower member, said filter including a first annular accordion-pleated filter element bonded to said end caps having one enlarged pleat, and a second cylindrical filter element disposed within said first-mentioned filter element and in abutment therewith and bonded to said annular end caps to make up a unitized filter and form a filtering chamber with said one pleat, an aperture formed in said lower member and in said one end cap engaging said lower member, with said aperture being within said one enlarged pleat and in registra tion with said filtering chamber; said one enlarged pleat being configured to conform to the shape of the aperture in said lower member and end cap.

Claims (2)

1. An air cleaner adapted for use in a closed positive crankcase ventilation system on an internal combustion engine induction system wherein the air cleaner comprises: a housing formed by an upper member and a lower member, said housing having an air inlet and an air outlet spaced therefrom and adapted to register with the induction system of said engine; an air filter positioned between the air inlet and air outlet having spaced annular end caps disposed interior of said housing with said end caps sealingly engaging said upper member and said lower member, said filter including a first annular accordion-pleated filter element bonded to said end caps having one enlarged pleat, and a second cylindrical filter element disposed within said first-mentioned filter element and in abutment therewith and bonded to said annular end caps to make up a unitized filter and form a filtering chamber with said one pleat, an aperture formed in said housing and in one of said end caps with said aperture being within said one enlarged pleat and in registration with said filtering chamber.
2. An air cleaner adapted for use in a closed positive crankcase ventilation system on an internal combustion engine induction system wherein the air cleaner comprises: a housing formed by an upper member and a lower member, said housing having an air inlet and an air outlet spaced therefrom and adapted to register with the induction system of said engine; an air filter positioned between the air inlet and air outlet having spaced annular end caps disposed interior of said housing with said end caps sealingly engaging said upper member and said lower member, said filter including a first annular accordion-pleated filter element bonded to said end caps having one enlarged pleat, and a second cylindrical filter element disposed within said first-mentioned filter element and in abutment therewith and bonded to said annular end caps to make up a unitized filter and form a filtering chamber with said one pleat, an aperture formed in said lower member and in said one end cap engaging said lower member, with said aperture being within said one enlarged pleat and in registration with said filtering chamber; said one enlarged pleat being configured to conform to the shape of the aperture in said lower member and end cap.
US3589108A 1969-05-21 1969-05-21 Air cleaner for crankcase ventilation system Expired - Lifetime US3589108A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828529A (en) * 1972-03-01 1974-08-13 Knecht Filterwerke Gmbh Apparatus for filtering oil vapors
US3906724A (en) * 1973-12-03 1975-09-23 Toyota Motor Co Ltd Air cleaner assembly for an internal combustion engine having an exhaust gas purification system
US3990419A (en) * 1974-05-20 1976-11-09 Toyota Jidosha Kogyo Kabushiki Kaisha Air cleaner for use with an internal combustion engine
US4013051A (en) * 1974-07-08 1977-03-22 Parcels Ross M Automotive crankcase emission control system
US4653457A (en) * 1986-03-21 1987-03-31 General Motors Corporation Air cleaner with crankcase breather assembly
US4838909A (en) * 1988-09-06 1989-06-13 Textron, Inc. Cartridge air filter and method of making the same
WO1990009520A1 (en) * 1989-02-10 1990-08-23 Allied-Signal Automotive Of Canada Inc. Dual function air filter
US5028330A (en) * 1989-06-12 1991-07-02 Allied-Signal Inc. Filter & process for manufacturing filters using material cured by ultraviolet radiation for end caps
US5128071A (en) * 1991-02-06 1992-07-07 S & S Cycle, Inc. Carburetor
USRE36129E (en) * 1992-07-08 1999-03-09 Dana Corporation Air filter sealing groove
US6143049A (en) * 1997-06-27 2000-11-07 Donaldson Company, Inc. Aerosol separator; and method
US6171355B1 (en) 1997-06-27 2001-01-09 Donaldson Company, Inc. Aerosol separator; and method
US6187073B1 (en) 1999-03-17 2001-02-13 Donaldson Company, Inc. Air cleaner; aerosol separator; and method
US6290739B1 (en) 1999-12-29 2001-09-18 Donaldson Company, Inc. Aerosol separator; and method
US20030163980A1 (en) * 2002-02-15 2003-09-04 Ruehle Edward A. Race engine air cleaner housing
US20070089718A1 (en) * 2005-10-11 2007-04-26 Mann & Hummel Gmbh Air filter, secondary air charging system and seal arrangement for a secondary air charging system
US20100122675A1 (en) * 2006-07-12 2010-05-20 Cummins Filtration Ip Inc., A Corporation Organized Under The Laws Of The State Of Delawere Oil Fill Cap with Air/Oil Separator
US8752533B2 (en) 2011-02-11 2014-06-17 Briggs & Stratton Corporation Air filter assembly for an engine
USD736263S1 (en) 2011-02-11 2015-08-11 Briggs & Stratton Corporation Air filter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033030A (en) * 1960-06-17 1962-05-08 Gen Motors Corp Air cleaner condition indicator
GB900450A (en) * 1960-04-26 1962-07-04 Purolator Products Inc Gas filter element
US3186391A (en) * 1963-11-06 1965-06-01 Gen Motors Corp Crankcase ventilation
US3277876A (en) * 1964-09-30 1966-10-11 Ford Motor Co Crankcase ventilation system for an internal combustion system
US3450117A (en) * 1966-12-01 1969-06-17 Gen Motors Corp Internal combustion engine air filters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB900450A (en) * 1960-04-26 1962-07-04 Purolator Products Inc Gas filter element
US3033030A (en) * 1960-06-17 1962-05-08 Gen Motors Corp Air cleaner condition indicator
US3186391A (en) * 1963-11-06 1965-06-01 Gen Motors Corp Crankcase ventilation
US3277876A (en) * 1964-09-30 1966-10-11 Ford Motor Co Crankcase ventilation system for an internal combustion system
US3450117A (en) * 1966-12-01 1969-06-17 Gen Motors Corp Internal combustion engine air filters

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828529A (en) * 1972-03-01 1974-08-13 Knecht Filterwerke Gmbh Apparatus for filtering oil vapors
US3906724A (en) * 1973-12-03 1975-09-23 Toyota Motor Co Ltd Air cleaner assembly for an internal combustion engine having an exhaust gas purification system
US3990419A (en) * 1974-05-20 1976-11-09 Toyota Jidosha Kogyo Kabushiki Kaisha Air cleaner for use with an internal combustion engine
US4013051A (en) * 1974-07-08 1977-03-22 Parcels Ross M Automotive crankcase emission control system
US4653457A (en) * 1986-03-21 1987-03-31 General Motors Corporation Air cleaner with crankcase breather assembly
US4838909A (en) * 1988-09-06 1989-06-13 Textron, Inc. Cartridge air filter and method of making the same
WO1990009520A1 (en) * 1989-02-10 1990-08-23 Allied-Signal Automotive Of Canada Inc. Dual function air filter
US5028330A (en) * 1989-06-12 1991-07-02 Allied-Signal Inc. Filter & process for manufacturing filters using material cured by ultraviolet radiation for end caps
US5128071A (en) * 1991-02-06 1992-07-07 S & S Cycle, Inc. Carburetor
USRE36129E (en) * 1992-07-08 1999-03-09 Dana Corporation Air filter sealing groove
US6143049A (en) * 1997-06-27 2000-11-07 Donaldson Company, Inc. Aerosol separator; and method
US6171355B1 (en) 1997-06-27 2001-01-09 Donaldson Company, Inc. Aerosol separator; and method
US20040040269A1 (en) * 1997-06-27 2004-03-04 Donaldson Company, Inc. Aerosol separator; and method
US20050005582A1 (en) * 1997-06-27 2005-01-13 Donaldson Company, Inc. Aerosol separator; and method
US6355076B2 (en) 1997-06-27 2002-03-12 Donaldson Company, Inc. Aerosol separator; and method
US6758873B2 (en) 1997-06-27 2004-07-06 Donaldson Company, Inc. Aerosol separator and method
US7081145B2 (en) 1997-06-27 2006-07-25 Donaldson Company, Inc. Aerosol separator; and method
US6540801B2 (en) 1997-06-27 2003-04-01 Donaldson Company, Inc. Aerosol separator; and method
US6187073B1 (en) 1999-03-17 2001-02-13 Donaldson Company, Inc. Air cleaner; aerosol separator; and method
US20070144348A1 (en) * 1999-12-29 2007-06-28 Donaldson Company, Inc. Aerosol separator; and method
US20030051455A1 (en) * 1999-12-29 2003-03-20 Gieseke Steven S. Aerosol separator and method
US6530969B2 (en) 1999-12-29 2003-03-11 Donaldson Company, Inc. Aerosol separator; and method
US6290739B1 (en) 1999-12-29 2001-09-18 Donaldson Company, Inc. Aerosol separator; and method
US6852148B2 (en) 1999-12-29 2005-02-08 Donaldson Company, Inc. Aerosol separator and method
US20050193694A1 (en) * 1999-12-29 2005-09-08 Donaldson Company, Inc. Aerosol separator; and method
US7182804B2 (en) 1999-12-29 2007-02-27 Donaldson Company, Inc. Aerosol separator; and method
US6755881B2 (en) 2002-02-15 2004-06-29 Daimlerchrysler Corporation Race engine air cleaner housing
US20030163980A1 (en) * 2002-02-15 2003-09-04 Ruehle Edward A. Race engine air cleaner housing
US20070089718A1 (en) * 2005-10-11 2007-04-26 Mann & Hummel Gmbh Air filter, secondary air charging system and seal arrangement for a secondary air charging system
US7673622B2 (en) * 2005-10-11 2010-03-09 Mann + Hummel Gmbh Air filter, secondary air charging system and seal arrangement for a secondary air charging system
US20100122675A1 (en) * 2006-07-12 2010-05-20 Cummins Filtration Ip Inc., A Corporation Organized Under The Laws Of The State Of Delawere Oil Fill Cap with Air/Oil Separator
US8016904B2 (en) * 2006-07-12 2011-09-13 Cummins Filtration Ip Inc. Oil fill cap with air/oil separator
US8752533B2 (en) 2011-02-11 2014-06-17 Briggs & Stratton Corporation Air filter assembly for an engine
US9103303B2 (en) 2011-02-11 2015-08-11 Briggs & Stratton Corporation Air filter assembly for an engine
USD736263S1 (en) 2011-02-11 2015-08-11 Briggs & Stratton Corporation Air filter
US9850859B2 (en) 2011-02-11 2017-12-26 Briggs & Stratton Corporation Engine including an air filter assembly

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