Fuel filter device

Abstract

A fuel filter device includes a bag-shape filter body and a space forming member disposed in the filter body. The filter body includes an upper surface part, and a lower surface part welded with the upper surface part at edges to form a bag shape. At least the lower surface part has a woven mesh outer layer part, a first inner layer part situated adjacent to the outer layer part and formed of a melt blown non-woven cloth, and a second inner layer part situated adjacent to the first inner layer part at a side opposite to the outer layer part. The second inner layer part is formed of a spun-bonded non-woven cloth. The upper surface part and the lower surface part are all made of polypropylene that is not soaked and swollen with fuel to thereby maintain a mesh size of the filter body without change.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This is a continuation application of Ser. No. 10 / 834,882 filed on Apr. 30, 2004.BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT[0002]The present invention relates to a fuel filter device to be installed on a fuel intake port inside a fuel tank.[0003]Fuel inside a fuel tank is sent to an internal combustion engine through an intake pipe or the like disposed inside the fuel tank. A filter device is installed inside a fuel intake port of the intake pipe in order to remove water and / or a foreign material from the fuel not to be sent into a fuel pump. Japanese Patent Publication (Kokai) No. 07-148405 and Japanese Patent Publication (Kokai) No. 10-274169 have disclosed such filter devices. The filter devices have a filter body having an expanded bag shape and a shape preserving member disposed therein.[0004]The conventional filter body in the filter device is formed of nylon. Nylon is easily soaked and swollen with fuel. As a result, a me...

AI Technical Summary

Benefits of technology

The invention is a fuel filter device that includes a bag-shaped filter body and a space forming member that maintains the filter body in an expanded bag shape. The filter body has an inner layer part made of a non-woven cloth made of olefin resin and an outer layer part made of a woven mesh. The non-woven cloth is made of polyethylene or polypropylene and is not soaked and swollen with fuel, which maintains the size of the filter body and prevents a decrease in the mesh size over time. The woven mesh is made of olefin resin and is not soaked and swollen with fuel, which prevents fraying in the inner layer part. The inner layer part is formed of a non-woven cloth layer made with spun-bond and melt-blown methods, which capture fine dust and dirt and provide rigidity to the filter body. The technical effects of the invention are to prevent clogging of the filter body, decrease in load on the fuel pump, and maintain the shape of the filter body.

Problems solved by technology

Nylon is easily soaked and swollen with fuel.

As a result, a mesh size of the filter body decreases over time.

When the filter body has a smaller mesh size, a pressure of the fuel increases (greater pressure loss), thereby increasing load on the fuel pump.

Further, the filter body is easy to get clogged with dust and dirt, and the like, and the pressure of the fuel increases, thereby increasing load on the fuel pump.

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