Gas separation – Combined or convertible – In motor vehicle
Patent
1996-10-30
1998-05-26
Smith, Duane S.
Gas separation
Combined or convertible
In motor vehicle
55498, 55502, 123198E, B01D 4624
Patent
active
057558434
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an air filter especially one which is used for intake air in combustion engines and the like, and relates especially to air filters for engines in lorries.
BACKGROUND OF THE INVENTION
It is an important requirement for problem-free and long lasting operation of combustion engines that the air which is sucked in for combustion is filtrated and is, as far as possible, free from solid particles. Ever since combustion engines were first used, air filters have been used and a very great number of different constructions of intake filters have therefore been developed and become commonly recognized.
In a usual type of filter for combustion engines in vehicles, a cylinder-shaped filter is used which consists of folded paper where the air is sucked radially in through the folded paper forming a thick cylinder wall and where the cleaned air is sucked out from the filter axially through a central opening in the gable of the filter. The filters are often flat-shaped, i.e. the diameter is much larger than the axial length of the filter, but even the reversed shape may occur and this type is especially used for filtering air in lorry engines.
The paper filter is usually located in a housing or casing and it must therefore be sealed in a suitable way to the housing so that the air is forced to pass through the filter and no leakage of air streams passing outside the filter occurs. These radial filters are therefore sealed at the gable ends and these gables are in turn sealed against the surrounding house. The gable ends are therefore often provided with a steel plate or the like so that no air can penetrate in via the gables outside the filter. Examples of such filters are described in U.S. Pat. No. 5 071 456, W 91/00423 and the Swedish patent 201 270.
The known air filters above work reasonably well, and they clean the air to a desired extent without great problem. After some time of use they must however be exchanged since particles from the unclear air are caught in the filter and this will slowly be clogged. The filter must therefore be exchanged and it cannot be reused. Thus an environmental problem arises. The filter itself, which consists of paper, does not create such a problem but one of the gable plates, which is air tight and attached to the filter arid which usually supports the filter, is thick and must also be discarded as it is united with the filter. This gable plate usually consists of steel and it is often coated with zinc and varnished. It has therefore long been a desire, especially from an environmental point of view, to create a filter in which this plate does not have to be discarded every time a filter is changed and instead construct a filter without is substantial end plate which is undetachably united with the filter part.
SUMMARY OF THE INVENTION
According to the present invention an air filter has therefore been created especially for intake air in combustion engines etc, comprising a cylinder shaped housing having inlet openings for air in the envelope surface and an outlet opening for filtered air in one of the gable surfaces and, arranged in the housing a cylinder-shaped filter element having thick walls for radial air percolation inwardly and axial out flow (of filtered air) centrally through one of the gables, which filter element is provided with plates at the gable ends and via these plates is sealed to the housing which is characterized in that the plate at that gable end which is not provided with the outlet for filtered air extends radially beyond the thick filter wall and is provided at its circumferential portion with sealing material for sealing against the gable of the housing on the outer side by changing a cover against the gable which cover is screwed against the gable at the circumferential regions of the gable and the cover.
The air filter according to the invention is also characterized in that the seal consists of a ring having a U-shaped cross section which is drawn over the edge of the plate.
The seal according to
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AB Volvo
Smith Duane S.
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