JPH06317286A - Filter for motor-driven fuel pump - Google Patents

Abstract

PURPOSE:To restrain vibration caused by pump operation from being transmitted to a fuel tank, and reduce a noise by installing a protector at the central part in this lengthwise direction on a bag shape screen held in a condition being swollen by a frame installed in a pump. CONSTITUTION:A filter 12 has frame 13 installed in an in-tank system motor- driven fuel pump, a bag shape screen 14 held in a condition of being swollen by the frame 13 and a plate-like protector 15 interposed between the screen 14 and a bottom surface of a fuel tank. In this case, the protector 15 is installed at the central part in this lengthwise direction on a flexible screen 14. For example, a support piece 28 projecting left and right is formed in the central part in the lengthwise direction in the protector 15, and a pin 29 is formed integrally in the tip part of the support piece 28. After the pin 29 is inserted in an installing hole of an installing plate 30 loaded on the screen 14, the tip part of the pin 29 is calked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for an in-tank type electric fuel pump used in vehicles and the like.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIGS. FIG. 7A shows a side view of the filter, and FIG. 7B shows a sectional view thereof. FIG. 8 is a side view showing the pump assembly including the filter and installed in the fuel tank. First, referring to the pump assembly, as shown in FIG. 8, a bracket 2 attached to the fuel tank 1 so as to close the upper opening thereof is provided with a pump mounting stay 3, a fuel supply pipe 4, a return pipe 5, and an electrical connection. The connector 6 is attached.

An electric fuel pump (also referred to as a fuel pump) 8 integrally includes an electric motor such as a brushless motor or a DC motor and a pump section driven by the motor section, and is inclined by the stay 3. It is supported. The fuel supply pipe 4 is connected to a discharge port (not shown) on the upper surface of the fuel pump 8 via a communication hose 9, and the harness 6a of the connector 6 is electrically connected to a terminal 10 on the same upper surface. Further, a filter 12, which will be described in detail later, is attached to an intake port (not shown) on the bottom surface of the fuel pump 8.

The pump assembly as described above is installed in the fuel tank 1 as follows. That is, the fuel pump 8 and the like are inserted into the tank from the top opening of the fuel tank 1 so as to be immersed in the fuel, and the bracket 2 is fixed so as to close the opening. Although not shown, a pipe for supplying fuel to the engine is connected to the fuel supply pipe 4, a pipe for returning excess fuel from the engine to the tank is connected to the return pipe 5, and a power supply is connected to the connector 6. A harness connected to an electric circuit including is connected. The fuel pump 8 thus arranged in the fuel tank 1 sucks the fuel in the fuel tank 1 through the filter 12 by its operation and supplies it to the engine through the fuel supply pipe 4.

Next, the filter 12 assembled in the pump assembly will be described with reference to FIGS. 7 and 8. The filter 12 includes a frame 13 attached to the fuel pump 8, a bag-shaped screen 14 held in an inflated state by the frame 13, and a plate interposed between the screen 14 and the bottom surface 1a of the fuel tank 1. The shape protector 15 is provided.

The frame 13 is made of, for example, a synthetic resin material such as nylon resin, and as shown in FIG.
And a cylindrical connecting pipe 18 integrally formed at one end thereof
And an elbow-shaped attachment pipe 19 to which the connecting pipe 18 is attached by snap fitting or the like. Further, the inner bone 17 includes a main plate 21 in the form of a strip plate, a holding piece 22 protruding on both front and back surfaces thereof at a predetermined interval, a holding portion 23 protruding on the back surface of the front end portion of the main plate 21, and the main plate 21. Connection tube 1
8 and a thin portion 24 formed in the vicinity thereof. Further, a fixing piece 25 is formed on the mounting pipe 19 so as to be clipped to the pump body of the fuel pump 8.

The screen 14 is made of a synthetic resin material such as nylon resin and has a mesh suitable for a fuel filter function and is flexible. In this screen 14, the center portion of the fold of the two folds is insert-molded into the attachment pipe 19, and after the connection pipe 18 of the internal bone 17 is attached to the attachment pipe 19,
The peripheral portion of the screen is joined by heat welding to form a bag.

The protector 15 is formed of a synthetic resin material such as nylon resin into a substantially rectangular thin plate shape. At one end of the protector 15, a mounting portion 26 for mounting to the mounting pipe 19 of the frame 13 is provided.

As shown in FIG. 8, the filter 12 has a mounting pipe 19 of a frame 13 fitted to an intake port of the fuel pump 8 and a fixing piece 25 fixed to a pump body by a clip to fix the fuel pump 8 to the fuel pump 8. Is attached to. Further, the filter 12 before being installed in the fuel tank 1 has a substantially right-angled shape with respect to the fuel pump 8 as shown by a chain double-dashed line in FIG. Then, by installing the pump assembly in the fuel tank 1, as shown in FIG.
It is forcibly folded as shown by the solid line. At this time, as the frame 13 is bent at its thin portion 24, the screen 14 and the protector 15 are also bent. As a result, the bottom surface of the screen 14 is located on the bottom surface 1a of the tank.
Then, the protector 15 is pressed in between. The protector 15 serves to prevent or reduce the abrasion of the lower surface of the screen 14.

[0010]

According to the conventional filter 12, the protector 15 is attached to the attaching pipe 19 of the frame 13 by the attaching portion 26 of the protector 15. Therefore, the protector 15 is bent and deformed in the state of being arranged in the fuel tank 1. Therefore, the force of pressing the tank bottom surface 1a of the protector 15 becomes strong, and the vibration accompanying the operation of the fuel pump 8 is easily transmitted to the fuel tank 1 through the protector 15, so that the vibration noise becomes loud. The pressing force of the tank bottom surface 1a on the entire filter is the total of the bending force of the frame 13, the bending force of the screen 14, and the bending force of the protector 15.
In addition, before assembling, the protector 15 has the screen 14
On the other hand, as shown by the chain double-dashed line in FIG. 7B, it is easy to open (so-called blistering), so the workability associated with assembly to the fuel pump 8 and loading of the fuel pump 8 into the fuel tank 1, etc., deteriorates. ing.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a filter for an electric fuel pump capable of reducing vibration noise and improving workability such as assembly. To provide.

[0012]

SUMMARY OF THE INVENTION The present invention, which solves the above problems, is directed to a frame mounted on an in-tank type electric fuel pump, a bag-shaped screen held in an inflated state by the frame, the screen and a fuel tank. Is a filter for an electric fuel pump including a plate protector interposed between the protector and the bottom surface of the screen, and the protector is attached to the screen at a substantially central portion in the longitudinal direction.

[0013]

According to the above-mentioned means, since the protector is attached to the flexible screen, the protector is not bent and deformed when it is placed in the fuel tank. Therefore, the force of pressing the tank bottom surface of the protector itself is not generated, and the vibration accompanying the operation of the fuel pump is less likely to be transmitted to the fuel tank. Further, by attaching the central portion of the protector in the longitudinal direction to the screen, it is difficult for the protector before assembly to curl up.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Since this example is a modification of a part of the above-mentioned conventional example, the modified part will be described in detail, and the parts which are considered to be the same as or equivalent to those of the conventional example are denoted by the same reference numerals in the drawings and overlap. The description is omitted. A side view of the filter is shown in FIG. 1 (a), and a sectional view thereof is shown in FIG. 1 (b). Furthermore, FIG. 3 shows a bottom view of the filter. In FIG. 1 and FIG. 3, a support piece 28 that projects to the left and right is formed at a substantially central portion in the longitudinal direction of the protector 15. As shown in FIG. 4, which is a front view of the filter, both of the support pieces 28 are substantially S-shaped along the outer shape of the screen 14 and the tips thereof extend to the lower surface of the heat-welding edge portion of the screen 14.

The tip of the support piece 28 is attached to the relevant portion of the heat-welded edge of the screen 14 as follows. In FIG. 5, the mounting portion of which is shown in cross section,
A pair of pins 29 are integrally formed and protrude from the upper surface of the tip of the support piece 28 of the protector 15. Note that FIG.
The pin shape before attachment is indicated by the chain double-dashed line. The pin 29 is inserted into a mounting hole (reference numeral omitted) formed in the heat-welded edge portion of the screen 14 and a mounting plate 30 (reference numeral omitted) mounted on the edge portion of the strip plate, That pin 2
The tip of 9 is crimped by ultrasonic waves or heating as shown by the solid line in FIG. In this way, the protector 15 is attached to the screen 14. In addition, pin 2
Reference numeral 29a is attached to the crimped portion of 9. Also, the caulking portion 29a
2 is also shown in FIG. 2, which is a partially cutaway plan view of the filter 12.

Further, as shown in FIG. 1, in the protector 15 of this embodiment, the mounting portion 26 (see FIG. 7) in the conventional example is eliminated. In addition, the protector 15 of this example has a structure shown in FIG.
The opening hole 31 is opened as shown in FIG. In addition, as shown in FIGS. 1 and 4, a receiving portion 32 corresponding to the holding portion 23 in the inner bone 17 of the frame 13 is formed in a protruding shape at the tip portion (the left end portion in the drawing) of the protector 15. .

Further, as shown in FIG. 2, the frame 13
In the inner skeleton 17, the band-plate-shaped main plates 21 are arranged in two rows in parallel, and they are connected to each other by an appropriate connecting portion 34. The connecting portion 34 connects the holding portion 23 of each main plate 21, the holding piece 22, or the main plate 21 to each other.

The above-mentioned filter 12 is attached to the fuel pump 8 of the pump assembly shown in a side view in FIG. 6, and by installing the pump assembly in the fuel tank 1, the filter 12 is forced as shown by a solid line in the figure. Can be folded. As a result, the lower surface of the screen 14 is pressed against the tank bottom surface 1a with the protector 15 in between. At this time, as the frame 13 is bent at its thin portion 24, the screen 14 bends but the protector 15 does not bend. The two-dot chain line in FIG. 6 shows the filter 12 before being installed in the fuel tank 1.

According to the filter 12, the protector 1
Since 5 is attached to the flexible screen 14, the protector 15 is not bent and deformed in the state of being arranged in the fuel tank 1. Therefore, unlike the conventional example, the force pressing the tank bottom surface 1a of the protector itself is not generated, and the vibration accompanying the operation of the fuel pump 8 is less likely to be transmitted to the fuel tank 1, so that the vibration noise can be reduced. The bottom surface of the tank for the entire filter 1
The pressing force of “a” is a total force of the bending force of the frame 13 and the bending force of the screen 14, and the bending force of the protector 15 is reduced as compared with the conventional example. Further, by attaching the central portion of the protector 15 in the longitudinal direction to the screen 14, it is difficult for the protector 15 before assembling to be rolled up, so that the fuel pump 8 can be assembled into the fuel tank 1 and the fuel pump 8 can be installed into the fuel tank 1. The workability involved can be improved.

Further, since the protector 15 has the opening hole 31 formed therein, the screen 1 is different from the case without the hole.
It is possible to prevent the deterioration of the filtration performance of No. 4 above. Further, since the protector 15 is provided with the receiving portion 32 so as to receive the holding portion 23 of the inner bone 17 of the frame 13 with the portion corresponding to the screen 14 interposed therebetween, the length from the attaching portion to the fuel pump to the receiving portion thereof is increased. The length can be made long, and the pressing force of the tank bottom surface 1a of the frame 13 can be reduced as compared with the case where the length is short.

[0021]

According to the present invention, since the protector is attached to the flexible screen, it is difficult for vibrations associated with the operation of the fuel pump to be transmitted to the fuel tank.
Therefore, vibration noise can be reduced. Also, by attaching the protector to the screen at the center in the longitudinal direction, it is difficult for the protector to be rolled up before assembly, which improves workability in mounting the fuel pump and loading the fuel pump into the fuel tank. Can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a filter according to an embodiment.

FIG. 2 is a partially cutaway plan view of the same.

FIG. 3 is a bottom view of the same.

FIG. 4 is a front view of the same.

FIG. 5 is a cross-sectional view showing a mounting portion of a protector.

FIG. 6 is a side view showing a pump assembly including the filter of the embodiment.

FIG. 7 is an explanatory diagram showing a filter of a conventional example.

FIG. 8 is a side view showing a pump assembly including a conventional filter.

[Explanation of symbols]

 1 Fuel Tank 1a Bottom 8 Electric Fuel Pump 13 Frame 14 Screen 15 Protector

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Arakawa 1-1-1-1, Kyowa-cho, Obu-shi, Aichi Prefecture Aisan Industry Co., Ltd.

Claims (1)

[Claims] 1. A frame attached to an in-tank type electric fuel pump, a bag-shaped screen held in an inflated state by the frame, and a plate-shaped protector interposed between the screen and the bottom surface of the fuel tank. A filter for an electric fuel pump comprising:
A filter for an electric fuel pump, wherein the protector is attached to the screen substantially at the center in the longitudinal direction.