Patent Application
20100186596
The present invention generally relates to an air cleaner assembly for a motor vehicle, and more specifically, to an air cleaner assembly equipped with for secondary air induction.
Internal combustion engines require a source of combustion air. A typical source for combustion air is air drawn from outside of the vehicle, which commonly includes particulate contaminants. An air cleaner including an air filter element is normally provided in the air induction system to capture these particulate contaminants before combustion air is delivered to the vehicle engine. When operated in colder climates where heavy or blowing snow is common, snow may be drawn into the air cleaner and lead to eventual blockage of the air filter element, thereby cutting off the supply of combustion air and leading to poor engine performance.
In the prior art, air cleaners are known that include a secondary air inlet having a movable damper or power operated valve operable to open a secondary air supply to the air cleaner when the primary air supply becomes obstructed by snow. One example is U.S. Pat. No. 4,969,939, which discloses an air cleaner, equipped with a slideable valve including mechanical linkage extending into the operator cabin and operable by a vehicle operator to admit secondary air into the air cleaner in the event the normal air inlet becomes blocked by snow.
U.S. Pat. No. 6,395,048 discloses an air cleaner having an annular door with an open window that is rotatable between a first and a second position. In the first position outside air is admitted to the air cleaner. In the second position warmer under the hood air is provided to the air cleaner and the normal outside air inlet is blocked. A mechanical actuator rotates the door.
As can be understood from the above, many varieties of air cleaners equipped for secondary air induction are known. As can be seen from the prior art, air cleaners equipped for secondary air induction have a number of moving parts, are more complex and are therefore more costly that similar air cleaners lacking secondary air adaptations.
The present invention generally relates to an air cleaner assembly for a motor vehicle, and more specifically, to an air cleaner assembly equipped with for secondary air induction. Air cleaners equipped for secondary air are particularly advantageous in locales where weather conditions may result in blockage of the air filter with snow, ice or moisture. For operation in such environments the air cleaner is configured with a vacuum actuated valve configured and adapted to change from a closed to an open state when a vacuum in the housing increases to or beyond a predetermined vacuum value, thereby permitting the air cleaner to draw warm air from the engine compartment and allowing the vehicle engine to continue to operate even though airflow in the primary air intake may be obstructed. The introduction of this warm air flow would also begin to melt or dissipate any snow, ice or moisture accumulated on the air filter, clearing the system of the obstruction while providing the engine with enough air to properly operate.
In one aspect of the present invention an air cleaner for a motor vehicle includes a housing having an air inlet opening, an air outlet opening, a secondary air inlet opening and at least one peripheral wall defining a chamber therein. An air filter element is provided and received into the chamber and positioned to separate the air inlet opening from the air outlet opening. A vacuum actuated valve is provided in the secondary air inlet opening of the housing and is in communication with a secondary air portion of a dirty face of the filter element. The valve configured and adapted to automatically change from a closed to an open state when a vacuum in the housing increases to a predetermined vacuum value and then to close when the vacuum decreases below the predetermined value. The air inlet opening of the housing communicates with a primary air portion of the dirty air face of the filter element. The air outlet opening communicates with a clean air face of the filter element.
In another aspect of the present invention, the vacuum actuated valve is a unitary (meaning one-piece construction) duckbill valve formed of an elastomeric material such as (for example) rubber. The duckbill valve includes a sleeve portion having at least one wall member responsive to differential pressure between an interior surface and exterior surface of the valve. A flow closure member is provided on the sleeve portion of the valve and is operable by the at least one wall member of the valve. The flow closure member is configured to sealably close the secondary air inlet to prevent airflow therein when the differential pressure is less than the predetermined value and to open when the differential pressure is greater than the predetermined value.
In another aspect of the present invention, the duckbill valve further includes a flange provided on and encircling the valve sleeve and positioned opposite the lip members of the valve. A one-way mounting member is provided on the sleeve in a spaced-parallel relationship to the flange. The one-way mounting member includes a sloped face configured to allow insertion of the valve sleeve into the secondary air inlet opening. The mounting member is spaced from the flange at a distance configured to retentively capture the duckbill valve in the secondary air inlet opening by engaging against opposing faces of the peripheral housing wall between the mounting member and the flange. The valve flange and mounting member are configured to provide a closure substantially sealed to airflow between the filter housing and the duckbill valve.
In another aspect of the present invention, the flow closure member includes a pair of linearly aligned mateably opposing lip members.
In another aspect of the present invention, the flow closure member includes a plurality of mateably opposing intersecting lip members.
In another aspect of the present invention, the plurality of mateably opposing intersecting lip members are configured in a cross shape.
In another aspect of the present invention, a partition is provided extending between the peripheral walls of the housing and the dirty air face of the filter. The partition divides the dirty air face into a primary air portion and a secondary air portion. The partition is adapted to substantially block airflow between the primary and secondary air portions.
In another aspect of the present invention, the partition is a U-shaped partition.
In another aspect of the present invention, the U-shaped partition extends around at least 120 degrees of the duckbill valve.
The above features and advantages and other features and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with the accompanying drawings.
Disclosed herein is an improved motor vehicle air cleaner equipped for secondary air induction. In one aspect on the invention, the present invention provides vacuum actuated secondary air induction through a unitary elastomeric vacuum relief valve thereby providing a simple reliable solution that is low in cost and straightforward to manufacture. In the present invention secondary air induction refers to the selective introduction of relatively warm or heated air drawn from with the engine compartment of a motor vehicle into the air cleaner in response to elevated vacuum detected within the air cleaner assembly. In operation in cold climates the elevated vacuum may be indicative of blockage of the primary air intake portion of the air filter such as by accumulated snow.
An air outlet opening 28 is provided in the housing 10 and extends through the peripheral wall or walls 30 at the clean side 46 of the chamber 32, with the air outlet opening 28 in airflow communication with the clean air face 14 of the air filter 12. The air outlet opening 28 is connected through a clean air duct (not shown) to deliver filtered combustion air to a motor vehicle engine (not shown).
To permit the motor vehicle engine to operate in cold climates where adverse weather conditions may cause snow to accumulate in and obstruct flow through the primary air portion 22 of the air filter 12, the air cleaner is equipped with a vacuum actuated valve 20 provided in a secondary air inlet opening 52 in the peripheral walls 30 of the housing 10. The vacuum actuated valve 20 is configured to remain closed during normal operation/expected vacuum levels in the air intake system including the air filter housing 10. Should vacuum in the air filter housing 10 increase above a predetermined vacuum value (indicative of obstruction of airflow in the primary air portion 22 of the filter element 23), the vacuum actuated valve is configured to then open to admit warm air 62 from within the engine compartment into the air filter housing 10 providing combustion air to enable continued operation of the vehicle's engine (not shown). The vacuum actuated value 20 permits the vehicle engine to receive combustion air for continued engine operation even when the primary air portion 22 of the air filter 12 is blocked such as by an accumulated snow pack 18 present on the dirty air face 16 of the air filter element 12.
In motor vehicles, the air cleaner is typically installed under the hood within the engine compartment, which is significantly warmer than the ambient air outside the motor vehicle. In common practice the air intake for primary air is typically drawn from the outside air rather than using the warmer engine compartment air, and for good reason. The warmer the air temperature becomes in the engine air induction system, the engine charging temperature is thereby increased. An elevated engine charging temperature results in degradation in engine performance, reduction in fuel economy and loss of engine horsepower. This being the case, it is typical vehicle engineering practice to configure the air intake duct to draw engine intake air from outside of the vehicle and not from the engine compartment. Air induction systems that draw in outside air are exposed to the outside elements and may draw airborne particulates such as snow, ice and moisture particles into the air cleaner. As a result, the air filter element 12 may become blocked, starving the engine for combustion air and eventually stalling the engine. Additionally, as airflow is reduced into the engine, the reduced airflow results in a higher developed vacuum at the clean side 46 of the air filter housing 10 and air induction system, resulting in elevated vacuum within the engine crankcase that may damage engine seals and increase oil blow by. Advantageously, the present invention provides a simple, low cost, vacuum actuated secondary air induction solution for a motor vehicle air cleaner that permits warm engine compartment air 62 to be selectively drawn into the air cleaner 10 and thereby into the engine in the event of snow blockage 18 of the air filter element 12.
The vacuum actuated valve 20 is configured and adapted to permit quick, snap-in retentive installation of the valve 20 into the secondary air inlet opening 50 of filter housing 10. To this end, the vacuum actuated valve 20 includes a flange 50 that is provided on and encircles the sleeve portion 38 and is positioned at end of the sleeve portion 38 opposite the flow closure member 36. The flange 50 is sized and configured to have a diameter greater than the diameter of the secondary air inlet opening 52 so that the flange 50 is captured against an outside face of the peripheral wall 30 of the housing 10. Additionally a one-way mounting member 54 is provided on the sleeve portion 38 in a spaced-parallel relationship relative to the flange 50. The one-way mounting member 54 includes a sloped face 56. The sloped face 56 is sized and configured to compressibly wedge and slide against the inner wall of the secondary air inlet opening 50 during insertion of the valve 20 into the filter housing 10. The distance between the one-way mounting member 54 and the flange 50 is configured such that the vacuum actuated valve 20 can be retentively captured in the secondary inlet opening 52 by engaging opposing faces (64 and 66) of the peripheral housing wall 30 between the one-way mounting member 54 and the flange 50. The one-way mounting member 54 together with the flange 50 is configured to sealably close between the valve 20 and the peripheral wall 30 of the filter housing 10 thereby preventing airflow entering the housing 10 between the valve 20 and the inner wall of the secondary air opening 52.
In the embodiment illustrated in
In another aspect of the invention,
In
While the best modes for carrying out the invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention within the scope of the appended claims.
