Breather for an internal combustion engine fuel tank
First Claim
1. A breather for a fuel tank of an internal combustion engine having an adsorption filter comprising an adsorption chamber (28), an adsorption medium (31) contained within said adsorption chamber and a housing which is linked by means of a suction line to an induction manifold of the internal combustion engine and, by means of a filter line to the fuel tank and to a breather line to the atmosphere which can be shut off by a shut-off valve (51) in a breather line, and wherein a particle filter is arranged between the atmosphere and the shut-off valve, the particle filter (41) forms an outer wall of the housing (22) of the adsorption filter (1) thereby forming a filter chamber (38) between said particle filter and a gas tight dividing wall (36), said gas tight dividing wall (36) separates said filter chamber (38) from said adsorption chamber, said particle filter links said filter chamber with the atmosphere in a manner to allow gas permanence and is designed with a large surface area, so that the particle filter causes only a minor pressure drop in the adsorption filter (1) and the gas passes through the particle filter, and the said filter chamber, said shut-off valve (51), and said adsorption chamber (28) which are connected in a gas flow path.
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Accused Products
Abstract
A breather valve for a gas tank of an internal combustion engine having an adsorption filter which is linked to the atmosphere by a breather line which is controlled by a shut-off valve. As air flows through the shut off valve, contaminations entrained in the shut off valve may deposit in the shut-off valve, so that it will no longer close tightly. For this reason, a particle filter has been arranged in front of the shut-off valve. The particle filter is of a large surface area which is integrated in the housing of the adsorption filter, thus contamination of the shut-off valve (51) and an excessive pressure drop of the air flowing through the particle filter (41) is avoided. The integrated construction facilitates a simple assembly of the adsorption filter (41) which is suitable for internal combustion engines in motor vehicles.
40 Citations
23 Claims
- 1. A breather for a fuel tank of an internal combustion engine having an adsorption filter comprising an adsorption chamber (28), an adsorption medium (31) contained within said adsorption chamber and a housing which is linked by means of a suction line to an induction manifold of the internal combustion engine and, by means of a filter line to the fuel tank and to a breather line to the atmosphere which can be shut off by a shut-off valve (51) in a breather line, and wherein a particle filter is arranged between the atmosphere and the shut-off valve, the particle filter (41) forms an outer wall of the housing (22) of the adsorption filter (1) thereby forming a filter chamber (38) between said particle filter and a gas tight dividing wall (36), said gas tight dividing wall (36) separates said filter chamber (38) from said adsorption chamber, said particle filter links said filter chamber with the atmosphere in a manner to allow gas permanence and is designed with a large surface area, so that the particle filter causes only a minor pressure drop in the adsorption filter (1) and the gas passes through the particle filter, and the said filter chamber, said shut-off valve (51), and said adsorption chamber (28) which are connected in a gas flow path.
Specification