JPH0420487Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a fuel filter built into a fuel tank, and particularly relates to a fuel filter built into a fuel tank that uses a bag-shaped screen net and has a reinforcing material installed inside. This relates to improvements to filters.

(Prior Art) A fuel filter built into a fuel tank has two purposes.

One is when using an electric fuel pump with a very small clearance in the pump chamber when a vane or the like is used in the pump part, dust in the fuel tank flows into the pump chamber and causes pump malfunction. To prevent this.

The second purpose is to prevent water that has accumulated in the fuel tank from flowing into the engine due to the fuel absorbing water or condensed moisture in the air getting mixed into the fuel.

Naturally, it is also desirable that all the fuel in the fuel tank can be sent to the engine.

For the above reasons, it has been common practice to use screen nets of 150 to 300 meshes in filters and create various structures to achieve the original purpose.

A conventional example will be explained below using figures.

FIG. 7 is a diagram showing the state in which the fuel filter is installed in the fuel tank, where 1 is the fuel tank and 2 is its lid, which is fixed to the fuel tank 1. As shown in FIG. The lid part 2
A bracket 5 is fixed for fixing a pipe 3 connected to an engine (not shown) and a fuel pump 4, and the fuel pump 4 is fixed to the fuel tank 1 by the bracket 5 near its bottom. The fuel pump 4 has an outlet port 6 connected to the pipe 3 and an inlet port 7 at the bottom. A fuel filter 8 is attached to the inlet port 7 along the bottom surface of the fuel tank 1. At this time, it is preferable that the fuel filter 8 be as close to the bottom surface of the fuel tank 1 as possible so that it can be attached.

The fuel filter 8 is molded from resin and includes a cylindrical portion 81 attached to the fuel pump 4 and a screen net 82. The screen net 82
The space is reinforced with a bone portion 83. Inside the screen net 82, there is a suction port 8 from the cylindrical portion 81.
4 is open, and the shape formed by the screen net 82 is flat to ensure a filtration area.

FIG. 8 shows another conventional example of a fuel filter, in which a damper 11 is installed inside a cylindrical screen net 10, and a lid part 13 and a screen net 14 have a mounting part 12 for attaching the fuel pump at the lowest possible location. The frame part 15 is molded, and the fuel tank 1
installed at the bottom of the Even when the fuel tank 1 is filled with fuel, air remains inside the damper 11 to prevent pulsating flow from the fuel pump. FIG. 9 shows another conventional example in which a mounting portion 2 is attached to the end of the screen net 21.
5 is fixed, a reinforcing material 23 is installed inside the screen net 21, and the end portion 24 of the screen net 21 is welded and fixed. The reinforcing member 23 is a resin molded material and has a bendable portion 232 and a protrusion 231 for raising the screen net 21.

1 is the bottom of the fuel tank.

(Problems to be Solved by the Invention) Although the structures of conventional fuel filters built into fuel tanks have been described above, each of them has drawbacks.

First of all, in production, the one shown in FIG. 7 is manufactured by injection molding the cylindrical part 81 and the rib part 83 from above the screen net 82, which requires molding man-hours, and when considering mass production, the work There is a problem with speed.

In addition, since the screen net 82 is inserted, the rib portion 83 cannot be made very thin and has poor elasticity as a whole, so if it is installed close to the fuel tank bottom 1, it will not come into contact with the fuel tank bottom 1 within the error of the installation dimensions. It may not be possible to install it. Considering this, it is inevitable that the filter be installed separately from the fuel tank 1, and when the amount of fuel becomes small, the filter will separate from the fuel surface and the remaining fuel may not be sucked up.

In the case shown in Fig. 8, the fuel tank bottom 1
Since the height of the screen nets 10 and 14 is also high, even if water accumulates to some extent on the inner bottom surface of the fuel tank 1, it creates a fuel film and has the effect of blocking water.

However, since the screen nets 10 and 14 are insert-molded with the frame portion 15 and the lid portion 13,
It has poor elasticity and exhibits the same drawbacks as mentioned above.

The one shown in FIG. 9 is one in which a reinforcing material 23 is simply installed inside the screen net 21, and it is sufficient to create a space inside the net, and since a flexible portion 232 is also possible, it is also possible to provide elasticity. Since it can be installed in contact with the fuel tank 1, it is also possible to suck in all remaining fuel,
It is also possible to raise the screen net 21, so that even if water accumulates, it can be closed off. However, the disadvantages of this product are that the reinforcing material 23 has a complicated shape and the mold is expensive. It is difficult to seal the area near the area, so a distance L is absolutely necessary. This is because when the inside of the screen net 21 is suctioned by a pump and becomes a negative pressure, that part comes into close contact, resulting in a loss of filtration area.

(Means for solving the problems) The present invention solves the above-mentioned drawbacks, is inexpensive,
The aim is to provide a highly standardized fuel filter, and its feature is that a mounting part to be attached to the fuel intake pipe is fixed to a part of a screen net formed into a cylindrical or flat bag shape. Inside the screen net, there is a fold-shaped space reinforcing material that can be expanded and contracted.

(Example) An example of the present invention will be described below with reference to the drawings. Figure 1 is a perspective view showing a space reinforcing material 100 used in the present invention, in which pleats 101 are added to a tanzak-shaped filter paper and folded. The folds 101 are made of plastic, rubber, etc., or molded into pleats, and the folds 101 are always freely expandable and contractible.

FIG. 2 shows an embodiment of the fuel filter of the present invention, in which a mounting portion 202 is inserted and fixed to one end of a screen net 201 formed or woven into a flat bag shape, and the folds are inserted into the inside of the screen net 201. A space reinforcing material 100 of the shape of the shape is installed inside, and the end portion 203 is sealed, and if the fuel pump 4 or a fuel pump is not built into the mounting portion 202, a suction pipe is attached to the mounting portion 202. This figure shows the fuel tank installed along one side.
FIG. 3 is a diagram when manufacturing the fuel filter of the present invention, in which the end portion 203 is sealed with ultrasonic waves after the screen net 201 is installed, and the horn 205 is
In order to avoid this, the folds of the space reinforcing material 100 are contracted, and since the space reinforcing material 100 expands after welding is completed, the screen net 201 can be expanded to the vicinity of the end portion 203.

FIG. 4 and FIG. 5 show the fuel tank 1 being attached in contact with the bottom surface due to the difference in the shape of the bottom surface.
The space reinforcing material 100 can be bent at arbitrary positions A and B.

FIG. 6 shows a material in which the folds of the space reinforcing material are unevenly formed. A mounting part 302 is attached to one end of a cylindrical screen net 301, and the uneven folds 30
A space reinforcing material 304 having
3 is sealed. A fuel passage 306 is provided in a portion of the mounting portion 302 that is in contact with the space reinforcing member 304 .

(Effects of the Invention) Although the embodiments of the present invention have been described above, the following four unprecedented effects can be obtained because the stretchable pleated space reinforcing material is used inside the screen net.
First, since the pleats are contracted during manufacturing, the space reinforcement extends to the ends of the screen net, and the screen net does not come into close contact with each other during pump suction.
Second, since the bending position is arbitrary, it is possible to accommodate differences in the bottom shape of the fuel tank. Third
The total length can be freely adjusted by cutting the length of the space reinforcing material freely. Fourthly, by making the pleats uneven, the screen net can be provided with ridges, so that even when water accumulates, it can be used to separate water.

As described above, the present invention provides sufficient effects compared to conventional products, and can be said to be a significant technology for fuel filters built into fuel tanks.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the space reinforcing material of the present invention; FIGS. 2, 4, 5, and 6 are cross-sectional perspective views showing embodiments of the fuel filter of the present invention; FIG. 3 is a cross-sectional perspective view showing one manufacturing process of the fuel filter of the present invention, and FIGS. 7, 8, and 9 are cross-sectional views showing conventional fuel filters.

Claims (1)

[Scope of utility model registration request] In a fuel filter built into a fuel tank for an internal combustion engine, a mounting part to be attached to a fuel intake pipe is fixed to a part of a screen net formed into a cylindrical or flat bag shape, and the inside of the screen net is composed of a plurality of folds. A fuel filter with a built-in fuel tank for an internal combustion engine, characterized by a space reinforcing material that is expandable and retractable in the direction of the folds.