Búsqueda Imágenes Maps Play YouTube Noticias Gmail Drive Más »
Iniciar sesión
Usuarios de lectores de pantalla: deben hacer clic en este enlace para utilizar el modo de accesibilidad. Este modo tiene las mismas funciones esenciales pero funciona mejor con el lector.

Patentes

  1. Búsqueda avanzada de patentes
Número de publicaciónUS3541765 A
Tipo de publicaciónConcesión
Fecha de publicación24 Nov 1970
Fecha de presentación21 Oct 1968
Fecha de prioridad21 Oct 1968
Número de publicaciónUS 3541765 A, US 3541765A, US-A-3541765, US3541765 A, US3541765A
InventoresAdler Leonard E, Nelson Thomas A
Cesionario originalFord Motor Co
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Dual element air cleaner fuel evaporative loss control
US 3541765 A
Resumen  disponible en
Imágenes(1)
Previous page
Next page
Reclamaciones  disponible en
Descripción  (El texto procesado por OCR puede contener errores)

Nov. 24, 1970 L. E. ADLER ETAL DUAL ELEMENT AIR CLEANER FUEL EVAPORATIVE LOSS CONTROL Filed 001;. 21, 1968 a a .7 A /d m8 N T O N E v N m fl AA W c LH LT ATTORNEY United States Patent 01 hoe 3,541,765 Patented Nov. 24, 1970 3,541,765 DUAL ELEMENT AIR CLEANER FUEL EVAPORATIVE LOSS CONTROL Leonard E. Adler, Detroit, and Thomas A. Nelson,

Birmingham, Mich., assignors to Ford Motor Company, Dearborn, Mich., a corporation of Delaware Filed Oct. 21, 1968, Ser. No. 769,154 Int. Cl. B01d 50/00 US. Cl. 55-316 1 Claim ABSTRACT OF THE DISCLOSURE An engine air cleaner contains two concentrically mounted ring type air filter elements, the inner one containing a bed of activated carbon to absorb excess fuel vapors from the carburetor fuel bowl and vehicle gasoline tank during the hot soak cycle of the engine, the vapors being purged into the engine during the normal air flow through the air cleaner, the inner filter being lower in height than the outer to provide a non-valved orificed air bypass of the inner filter of the air from the outer filter to the carburetor.

This invention relates, in general, to an internal combustion engine. More particularly, it relates to an air cleaner assembly for such an engine.

One of the primary objects of the invention is to provide an automotive type engine with an air cleaner assembly that will adsorb carburetor fuel bowl and vehicle gasoline tank vapors so that they are not discharged freely into the atmosphere, and yet will purge these vapors from the air cleaner assembly into the engine during the normal operation of the engine.

Another object of the invention is to provide a fuel vapor control of a type described above in which the adsorption-desorption functions of the air cleaner are performed without the use of valving.

A still further object of the invention is to provide an air cleaner assembly providing fuel vapor adsorptionpurge functions that are self-regulating in that the purging function automatically varies with the air flow to prevent excessive enrichening of the air-fuel mixture and an increase in exhaust emissions.

A still further object of the invention is to provide a fuel vapor emission control system for an automotive type engine consisting of: an air cleaner assembly having a pair of concentrically mounted air filters; the innermost of which consists of a bed of activated carbon operably connected to excess fuel vapors from the carburetor float bowl and vehicle gasoline tank for absorption of the vapors by the carbon particles during the hot soak cycle of the engine; and automatic desorption or purging of the fuel vapors from the carbon bed during normal operation of the engine inducing an air flow through both filters; the carbon bed filter being of lesser axial width than the outermost filter so as to provide a bypass area between the two filters; the bypass area constituting an orifice in parallel with the orifice defined by the carbon bed filter to effectively control the purge flow and the restriction to flow of the air into the engine carburetor.

Other objects, features and advantages of the invention will become more apparent upon reference to the succeeding detailed description thereof, and to the drawings illustrating the preferred embodiments thereof, wherein:

FIG. 1 is a perspective view, with parts broken away and in section, of an air cleaner assembly embodying the invention;

FIG. 2 is an enlarged cross-sectional view of a detail of FIG. 1; and

FIG. 3 is an enlarged cross-sectional view of one-half of a modified air cleaner assembly.

FIG. 1 shows an essentially horizontally disposed air cleaner assembly having a conventional dish-shaped tray portion 10. It has a hollow interior closed by a fiat cover 12, with an annular seal element 14 therebetween. Tray portion 10 has essentially vertical wall portions 16 with an opening 18 at one portion constituting a fresh air inlet. A central axial opening 20 is provided in the bottom of tray portion 10 for a close fit over the air horn air inlet portion 22 of a conventional downdraft type carburetor 24, in a known manner. Cover 12 and tray 10 are secured to the carburetor by a bail member, not shown, secured in the carburetor induction passage and having a threaded portion projecting through cover 12 and engaged by a wing nut, in known manner.

Positioned within tray portion 10 are a pair of concentrically mounted ring-type filter elements 30 and 32 seated on portions of tray portion 10. The outermost filter element 30 constitutes a known type of radial flow, pleated paper element, perforated to permit the passage of air through while filtering foreign particles therefrom, in a known manner. Further details of construction and operation of the latter filter element are not given since they are known and believed to be unnecessary for an understanding of the invention. Sufiice it to say that the paper element is enclosed radially between annular perforated screens 34 having their edges buried sealingly in end annular plate members 36. The filter element 30 is of a height to sealingly engage the tray 10 and cover 12, thereby forcing all of the air passing through inlet 18 to pass through the pleated paper element on its way to the carburetor opening.

Spaced radially inwardly of pleated paper element 30 is filter element 32 consisting of a ring-like bed of activated carbon particles of a size suitable for the adsorption of hydrocarbons, in a manner to be described. The carbon particles are contained between a pair of mesh screens 40 having their edges sealingly imbedded in annular end caps 42 of plastic or similar material. The lower half portion of the carbon bed is provided with an annular groove or manifold 44 connected at its bottom by a hole 46 in end cap 42 to a fuel vapor line 48. The latter is a fuel vapor vent from the fuel bowl 50 of carburetor 24.

As shown in FIG. 1, it will be seen that the carbon filter element 32 is not as high; i.e., is of less axial width, than the pleated paper element 30. This provides a clearance space 52 between the element 32 and the air cleaner cover 12 through which air may flow from the pleated paper filter element 30 directly to the carburetor 24 bypassing the activated carbon filter element 32. In this case, the clearance space 52 is controlled in area to constitute an orifice in parallel with the orifice created by the restriction to flow through the carbon bed filter element 32. The area of the clearance space 52 is chosen to provide the desired restriction to assure the necessary purge flow through the activated carbon element without unduly restricting the overall air flow into the engine. Thus, the size of the bypass will control the overall pressure drop through the air cleaner assembly so that the fuel vapors will be purged into the engine, and yet all of the engine air requirements will be met.

FIG. 3 shows a modified form of carbon bed element. In this case, the inner end cap 54 is channel shaped in cross-section and constitutes a manifold 56 connected by a number of circumferentially spaced holes 58 to the carbon particle bed. The manifold on the opposite side is connected to the vapor containing conduit 48. In all other respects, however, the construction and operation of the air cleaner assembly remains essentially the same as that already described in connection with FIG. 1.

In operation, during the hot soak cycle of the engine when the engine is shut down and the temperature change becomes great enough so that considerable fuel in the carburetor fuel bowl vaporizes, the increased vapor pressure will force fuel vapors through the vent tube 48 into the annular groove 44 (FIG. 1) or manifold 56 (FIG. 3) of the activated carbon bed filter element 32. Subsequently, the vapors will flow over the carbon particles and form a film thereon and be adsorbed.

When the engine again operates, the suction created in the intake section of the carburetor creates a pressure differential between the atmospheric air at the inlet 18 to the air cleaner and the carburetor inlet, thereby inducing a How through both the pleated paper filter element 30 and the activated carbon bed element 32. The air flow across both element creates a pressure differential or pressure drop across them causing the fuel vapors to be desorbed or purged from the carbon particles for flow into the carburator proper.

The purging, of course, will be determined by the particles sizes, and the air flow, which will be determined by the engine speed, etc. The construction of the carbon bed element being of lesser axial height than the pleated paper element provides an effective purge control without the use of valving.

From the foregoing, therefore, it will be seen that the invention provides a fuel vapor emission control sys tem in the air cleaner assembly for an internal combustion engine that effectively stores fuel vapors emitted by the carburetor fuel bowl, and that during normal operation of the engine, the fuel vapors are purged from the air cleaner assembly into the engine in a manner such that the overall fuel ratio of the engine is relatively uneffected since clean air is bypassed around the fuel vapor absorbing element. It will also be seen that the purge function and timing of the system described will be controlled by the size of the carbon particles utilized, the configuration of the activated charcoal bed filter, and the variance in air flow through the bed controlling the pressure drop thereacross.

While the invention has been illustrated and described in its preferred embodiments, it will be clear to those skilled in the arts to Which it pertains that many changes and modifications may be made thereto without departing from the scope of the invention. For example, the vapor vent tube 48 from the carburetor could be branched so as to include vapors from the vehicle gasoline tank.

What is claimed is: 4

1. An engine air cleaner assembly comprising an essentially horizontal disposed hollow annular closed housing having an ambient air inlet in the side thereof, air outlet means in a central portion of said housing, and a pair of radially spaced annular filter elements concentrically mounted in said housing, the radially outer element having essentially the same axial width as said housing forcing all airflow from said inlet therethrough, the radially inner element consisting of a bed of activated carbon for the adsorption and desorption of hydrocarbon vapors threby and therefrom, said inner element being of less axial Width than the outer element providing a restricting axial clearance defining an orifice between said inner element and housing combination with the radial space between said elements for a controlled flow of air therethrough from said outer filter bypassing said inner filter, and fuel vapor containing means connected to and discharging excess fuel vapor into said inner filter under conditions of engine hot soak whereby said fuel vapors are adsorbed by said carbon, the flow of air through said outer filter towards said outlet purging said inner filter of said fuel vapors, said inner element having an annular manifold formed therein and receiving said fuel vapors therein, said manifold defining a surface area of activated carbon particles exposed to said fuel vapors.

References Cited UNITED STATES PATENTS 2,122,111 6/1938 Poelman et a1. -316 2,400,180 5/ 1946 Venable 55-498 2,608,269 8/1952 Briggs 55-316 2,717,585 9/ 1955 Bradshaw.

2,996,145 8/ 1961 Thornburgh 55-498 3,171,726 3/1965 Roney et al 55-387 3,186,391 6/1965 Kennedy 55-482 3,189,179 6/1965 McMichael 210-315 3,221,724 12/1965 Wentworth 123-136 3,368,326 2/1968 Hervert 123-136 3,448,731 6/ 1969 Daigh 123-120 FRANK W. LU'ITER, Primary Examiner B. NUZICK, Assistant Examiner US. Cl. X.R.

Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US2122111 *22 Nov 193428 Jun 1938Poelman Armand J JAir filter
US2400180 *8 Abr 193714 May 1946Mine Safety Appliances CoAir-purifying apparatus
US2608269 *6 Abr 194826 Ago 1952Briggs Southwick WOil separator
US2717585 *1 Oct 195413 Sep 1955Bradshaw George WOverhead valve ram air cooling and filtering device
US2996145 *17 Sep 195815 Ago 1961Gen Motors CorpFilter sealing means
US3171726 *20 Sep 19612 Mar 1965Mine Safety Appliances CoGas-drying apparatus
US3186391 *6 Nov 19631 Jun 1965Gen Motors CorpCrankcase ventilation
US3189179 *18 Jul 196215 Jun 1965Gen Motors CorpReplaceable filter cartridge for a dry cleaner
US3221724 *27 Ene 19647 Dic 1965Gen Motors CorpVapor recovery system
US3368326 *3 May 196513 Feb 1968Universal Oil Prod CoMeans for preventing hydrocarbon losses from an engine carburetor system
US3448731 *25 Mar 196810 Jun 1969Atlantic Richfield CoVehicle vapor recovery system
Citada por
Patente citante Fecha de presentación Fecha de publicación Solicitante Título
US3662889 *18 Jun 197016 May 1972Takarabe ShigehiroWater cleaner
US3678663 *2 Sep 197025 Jul 1972Ford Motor CoAir cleaner remote from engine and having integrated fuel vapor adsorption means
US4139354 *21 Jul 197713 Feb 1979Futurecraft CorporationFilter for the removal of particulate and vaporous mercury
US4279630 *6 Mar 197921 Jul 1981Nippondenso Co., Ltd.Air cleaning means for internal combustion engine
US4929260 *11 Oct 198929 May 1990Colt Industries Inc.Adjustable air cleaner fastening assembly
US646476122 Dic 199915 Oct 2002Visteon Global Technologies, Inc.Air induction filter assembly
US650561014 Feb 200214 Ene 2003Siemens Vdo Automotive, Inc.Engine intake system having a hydrocarbon collection pit
US669255117 Jul 200217 Feb 2004Delphi Technologies, Inc.Air cleaner assembly and process
US6699310 *16 Dic 20022 Mar 2004Toyoda Boshoku CorporationEvaporative fuel adsorbing member and air cleaner
US6736871 *9 Dic 200218 May 2004Visteon Global Technologies, Inc.Integrated filter screen and hydrocarbon adsorber
US67528592 Oct 200222 Jun 2004Delphi Technologies, Inc.Air cleaner assembly for reducing pollutants from being discharged into the atmosphere
US7070641 *3 Dic 20034 Jul 2006Fleetguard, Inc.Carbon media filter element
US70863905 Nov 20048 Ago 2006Briggs & Stratton CorporationIntegrated fuel tank and vapor containment system
US715957727 Oct 20059 Ene 2007Briggs And Stratton CorporationStationary evaporative emission control system
US716357423 Mar 200416 Ene 2007Honeywell International, Inc.Evaporative emissions filter
US7182802 *19 Mar 200327 Feb 2007Honeywell International, Inc.Hydrocarbon vapors present in air induction system after engine shut-down are retained in adsorbent member until air flows through induction system after engine starts; internal combustion engines
US718564019 Ago 20056 Mar 2007Briggs & Stratton CorporationIntegrated fuel tank and vapor containment system
US7213581 *10 Ene 20058 May 2007Delphi Technologies, Inc.Throttle body with hydrocarbon adsorber
US7222612 *27 Ene 200529 May 2007Delphi Technologies, Inc.Low-resistance hydrocarbon adsorber cartridge for an air intake of an internal combustion engine
US7278406 *19 Abr 20069 Oct 2007Delphi Technologies, Inc.Spiral-wound hydrocarbon adsorber for an air intake of an internal combustion engine
US728152527 Feb 200616 Oct 2007Briggs & Stratton CorporationFilter canister family
US73445861 Nov 200418 Mar 2008Honeywell International, Inc.Evaporative emissions filter
US737796626 Ago 200427 May 2008Honeywell International, Inc.Adsorptive assembly and method of making the same
US743528927 Sep 200514 Oct 2008Briggs & Stratton CorporationIntegrated air cleaner and vapor containment system
US745570710 Feb 200325 Nov 2008Donaldson Company, Inc.Reverse flow air filter arrangement and method
US7476268 *17 Nov 200513 Ene 2009Mann & Hummel GmbhAir filter
US7655166 *29 Ene 20082 Feb 2010Honeywell International Inc.Evaporative emissions filter
US7763104 *5 Sep 200627 Jul 2010Visteon Global Technologies, Inc.Hydrocarbon trap assembly
US8216349 *24 Dic 200910 Jul 2012Fram Group Ip LlcEvaporative emissions filter
EP1273789A1 *29 Jun 20018 Ene 2003Ford Global Technologies, Inc.Carbon canister for air cleaner
EP1321659A2 *17 Dic 200225 Jun 2003MAHLE Filtersysteme GmbHAir intake device for an internal combustion engine
Clasificaciones
Clasificación de EE.UU.96/138, 123/519, 55/482, 55/510
Clasificación internacionalF02M35/02, F02M35/024, F02M25/08
Clasificación cooperativaF02M25/0854, F02M35/024
Clasificación europeaF02M35/024, F02M25/08F