JP2010084538A - Fuel supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply device storing fuel therein, having the number of components reduced, achieving low cost, and facilitating an assembly work. <P>SOLUTION: This device is provided with a cover member 2 blocking a fuel tank bottom opening, a pump holder 8 retaining a fuel pump 4 together with a cover member 2, a filter storage part 11 storing a filter 15, and a liquid surface detection device detecting the fuel liquid surface position in a fuel tank. The pump holder 8 is arranged with a center axis thereof shifted from the center axis of the cover member 2, a filter holding part 11 is formed in an arc shape along the inner diameter of the cover member 2 and is formed as one unit with the pump holder 8, and a liquid surface detection device mounting part 17 is provided as one unit at a section which is the outer surface of the pump holder 8 and on which the filter storage part 11 is not arranged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel supply device, and more particularly, to a fuel supply device for sucking fuel in a fuel tank by a fuel pump to increase the pressure and supplying the increased fuel to a fuel injection valve of an engine.

  2. Description of the Related Art Conventionally, as a fuel supply device for a motorcycle, a fuel supply device in which a pump holder for holding a fuel pump is attached to a lid member and a filter is disposed on the suction port side of the fuel pump is known. This fuel supply device is installed by inserting a fuel pump and a filter so as to be positioned in the fuel tank through an opening formed in a lower bottom portion of the fuel tank of the motorcycle, and closing the fuel tank opening with a lid member. It is what is done.

  Then, after the foreign matter is removed by the filter, the fuel stored in the fuel tank is sucked by the fuel pump and boosted, and the boosted fuel is supplied to the fuel injection valve of the engine via the fuel pipe or the like. It has come to be.

  At this time, when the remaining fuel in the fuel tank is small, for example, when the fuel level in the fuel tank is greatly inclined, such as during climbing or wheeling, the fuel pump is supplied. There is a problem that the amount of fuel that is used decreases.

Therefore, conventionally, a technique has been disclosed in which a fuel pump is covered with a filter case made of a rubber material, and a certain amount of fuel is stored inside the filter case (see, for example, Patent Document 1).
JP 2008-106680 A

  However, in the fuel supply apparatus described in Patent Document 1, since the filter case is formed of a rubber material, the number of parts is increased, the cost is high, and the filter is attached after the tank holder or the like is assembled. Since the case is attached, there is a problem that the number of assembling steps increases. In addition, since the filter case is formed of a rubber material, there is a problem that it is extremely difficult to attach the fuel level detection device in the fuel tank.

  The present invention has been made in view of the above points, and is capable of storing fuel therein, reducing the number of parts, being inexpensive, and easily performing assembly work. Is intended to provide.

In order to achieve the above object, a fuel supply device according to claim 1 includes a lid member that closes a fuel tank bottom opening, and a fuel pump that is attached to an inner portion of the fuel tank of the lid member together with the lid member. A pump holder that holds the filter, a filter that is connected to the suction port of the fuel pump and filters the fuel, a filter housing portion that houses the filter, and a liquid level detection device that detects a fuel liquid level position in the fuel tank; In a fuel supply device comprising:
The pump holder is disposed at a position where its central axis is deviated from the central axis of the lid member, and the filter housing portion is formed in an arc shape along the inner diameter of the lid member and is integrated with the pump holder. Is formed,
A liquid level detection device mounting portion is integrally provided on a portion of the outer surface of the pump holder where the filter housing portion is not disposed.

  According to a second aspect of the present invention, in the first aspect, the pump holder side of the filter housing portion is closed by a side wall of the fuel pump to form a housing space for the filter housing portion. It is characterized by.

  According to the first aspect of the present invention, the pump holder, the filter housing portion, and the thermistor mounting portion are integrally formed, so that fuel can be stored inside and the number of parts can be reduced. In addition, it is inexpensive and can be easily assembled. In addition, the pump holder is disposed at a position where the central axis is deviated from the central axis of the lid member, and the liquid level detection device mounting portion is provided on the outer surface of the pump holder where the filter housing portion is not disposed. Since it is provided, it is possible to secure an installation space for the thermistor liquid level detection device mounting portion, and it is possible to efficiently mount the thermistor. Moreover, since the filter housing portion is formed in an arc shape along the inner diameter of the lid member, a large filter housing space can be secured in the filter housing portion. Thereby, size reduction of a fuel supply apparatus can be achieved.

  According to the second aspect of the present invention, since the housing space of the filter housing portion is formed by closing the pump holder side of the filter housing portion with the side wall of the pump holder, the filter holder side of the filter housing portion is formed. This eliminates the need for the wall surface of the filter housing, and allows the filter housing space of the filter housing portion to be increased, thereby reducing the weight of the pump holder and the filter housing portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment of a fuel supply apparatus according to the present invention.

  The fuel supply device 1 in the present embodiment includes a lid member 2 that is attached to the lower surface of a fuel tank (not shown) of a motorcycle. The lid member 2 has a cylindrical shape with a closed bottom surface, and a flange 3 protruding in the radial direction is formed on the outer peripheral surface of the lid member 2. On the inner bottom surface of the lid member 2, a pump support member 5 that supports a fuel pump 4 (described later) from below is projected. On one side of the lid member 2, a fuel discharge path 6 is formed that extends in the axial direction and has an upper end opening at the upper end of the lid member 2 and a lower end opening at a lower side surface of the lid member 2. Connected to the lower opening of the fuel discharge passage 6 is a fuel discharge pipe 7 extending outward in a substantially horizontal direction from the lower side surface of the lid member 2.

  Further, a pump holder 8 is configured to be mounted above the lid member 2, and the pump holder 8 is a cylindrical shape that is erected in the vertical direction and has an inner diameter substantially the same as the outer diameter of the fuel pump 4. Is formed. The pump holder 8 is arranged at an eccentric position so that the center axis thereof is deviated from the center axis of the lid member 2. Inside the pump holder 8, the fuel pump 4 has its suction port 9 downward. The discharge port 10 is accommodated so as to be positioned above.

  Further, on one side of the pump holder 8, a filter housing portion 11 formed in an arc shape along the inner diameter of the lid member 2 is formed integrally with the pump holder 8. In the present embodiment, the pump holder 8 side of the filter housing portion 11 is configured to form a housing space for the filter housing portion 11 by being closed by the side wall of the fuel pump 4 as shown in FIG. Yes.

  In addition, a notch 12 is formed at the outer lower edge of the filter housing portion 11, and the fuel from the fuel tank flows into the notch 12 while the pump holder 8 is joined to the lid member 2. The fuel supply port 13 is formed. The space formed between the lower side of the pump holder 8 and the inside of the filter housing portion 11 and the inside of the lid member 2 is configured to function as the chamber 14, and the fuel supply device 1 is attached to the fuel tank. In this state, the fuel in the fuel tank is filled into the chamber 14 from the supply slit. The suction port 9 of the fuel pump 4 is connected to the filter 15, and the filter 15 is accommodated in the filter accommodating part 11 from the upper part of the filter accommodating part 11 to the lower part of the lid member 2. Yes. A connecting portion 34 for connecting to the fuel pump 4 and a fuel feed pipe 35 connected to the suction port 9 of the fuel pump 4 are integrally attached to the filter 15.

  Further, as shown in FIGS. 5 and 6, a liquid level detection device for attaching a thermistor 16 as a liquid level detection device to a portion of the outer surface of the pump holder 8 where the filter housing portion 11 is not disposed. A mounting portion 17 is provided. The liquid level detection device mounting portion 17 includes an engagement support member 18 formed in an arc shape along the peripheral surface of the thermistor 16 so that the outer peripheral surface of the thermistor 16 is in contact with the engagement portion. 18, a plurality of groove portions 20, 20... That are engaged with flange portions 19 formed on the outer peripheral surface of the thermistor 16 are formed at substantially equal intervals. A plurality of engagement claws 21 are formed on both side surfaces of the engagement support member 18 at substantially equal intervals in the vertical direction. Further, the liquid level detection device mounting portion 17 includes a holding plate 22, and the holding plate 22 includes an elastic portion 23 made of a conductive elastic material such as metal and curved along the outer peripheral surface of the thermistor 16. ing. Further, on both sides of the holding plate 22, engagement pieces 24 extending on both sides of the engagement support member 18 are formed, and each engagement piece 24 is engaged with the engagement claw 21 of the engagement support member 18. An engagement hole 25 to be joined is formed. Further, a ground terminal 27 to which the ground wire 26 is connected is formed on the upper end portion of the holding plate 22 so as to protrude. Then, with the flange portion 19 of the thermistor 16 engaged with the predetermined groove portion 20 of the engagement support member 18 so that the thermistor 16 is at a predetermined height position, the engagement hole 25 of the holding plate 22 is By engaging the engagement claw 21 according to the height, the thermistor 16 can be elastically held by the elastic portion 23 of the holding plate 22 and the thermistor 16 can be held at a predetermined height position. It is configured.

  A fuel pipe 28 for fuel fed from the discharge port 10 of the fuel pump 4 is provided at the upper end of the pump holder 8 so as to extend in the horizontal direction. One end of the fuel pipe 28 is provided at the pump holder 8. The lower end portion of the lid member 2 communicates with the fuel discharge path 6 of the lid member 2. In the present embodiment, the pump holder 8, the filter housing portion 11, and the fuel pipe 28 described above are each integrally molded from resin.

  A pressure adjustment valve 29 for adjusting the pressure of the fuel sent from the fuel pump 4 is installed at the other end of the fuel pipe 28. Further, a return opening 30 is formed on the upper surface of the filter housing portion 11, and a return pipe 31 for discharging the fuel overflowed by the pressure regulating valve 29 toward the return opening 30 of the filter housing portion 11 is provided. ing. The distal end portion of the return pipe 31 is installed apart from the return opening 30 and is installed so as to be directed to the return opening 30.

  Then, the fuel supply pipe 35 of the filter 15 is connected to the suction port 9 of the fuel pump 4, and the filter 15 is assembled to the fuel pump 4 via the connection portion 34, and then the fuel pump 4 is accommodated in the pump holder 8. At the same time, the filter 15 is assembled to the upper end of the lid member 2 in a state where the filter 15 is accommodated in the filter accommodating portion 11, and is fastened and fixed by a screw 36. In this state, the lower surface of the fuel pump 4 is held by the pump support member 5 via the insulator 32 with the connection portion 34 of the filter 15 sandwiched therebetween. Further, the lower end portion of the fuel pipe 28 communicates with the fuel discharge path 6 of the lid member 2, and the chamber 14 is formed below the pump holder 8, inside the filter housing portion 11, and inside the lid member 2. Is.

  The fuel supply apparatus 1 configured as described above is attached to the bottom of the fuel tank so that the pump holder 8 is inserted into the fuel tank, and the fuel discharge pipe 7 is connected to the engine fuel via a pipe (not shown). Connected to the injection device.

  Next, the operation of this embodiment will be described.

  First, the fuel stored in the fuel tank flows into the chamber 14 from the fuel supply port 13. In a state where the engine is stopped, the fuel pump 4 is not driven, and fuel supply from the fuel pump 4 to the fuel pipe 28 is not performed.

  When the engine is operated, the fuel pump 4 is driven, and the fuel stored in the chamber 14 is filtered by the filter 15 and then sucked from the suction port 9 of the fuel pump 4 via the fuel feed pipe 35. Then, the pressurized fuel is discharged from the discharge port 10 to the fuel pipe 28. Here, the pressure is adjusted by the pressure adjusting valve 29 and supplied to the fuel injection valve of the engine through the fuel pipe 28, the fuel discharge path 6 and the fuel discharge pipe 7.

  On the other hand, the return fuel that has overflowed when pressure adjustment is performed by the pressure adjustment valve 29 is discharged toward the return opening 30 of the filter housing portion 11 through the return pipe 31. Since the tip of the return pipe 31 is spaced apart from the return opening 30, part of the return fuel is returned from the return opening 30 to the inside of the filter housing portion 11, and part of the return fuel Is discharged into the fuel tank through the gap between the tip of the return pipe 31 and the return opening 30. Thereby, a part of the vapor contained in the return fuel is discharged into the fuel tank, and the amount of vapor returned to the inside of the filter housing portion 11, that is, the inside of the chamber 14 can be reduced. Further, the vapor generated inside the chamber 14 collects in the upper part of the filter housing part 11, but the return opening 30 is formed on the upper surface of the filter housing part 11. The collected vapor can be efficiently discharged from the return opening 30 into the fuel tank.

  Here, when the fuel tank provided with the fuel supply device 1 is mounted on the two-wheeled vehicle, the remaining fuel in the fuel tank is small. For example, the fuel liquid level in the fuel tank such as during uphill traveling or during wheelie traveling. In the present embodiment, the fuel supplied to the fuel pump 4 may decrease. However, in the present embodiment, the lower side of the pump holder 8 and the inside of the filter housing portion 11, and the lid member 2. A chamber 14 is formed between the two and a constant amount of fuel can be stored in the chamber 14, so that it is possible to reliably prevent the occurrence of fuel shortage or the like.

  As described above, in this embodiment, the pump holder 8, the filter housing portion 11, the fuel flow path and the liquid level detection device mounting portion 17 are integrally formed of resin, so that the fuel inside Can be stored, the number of parts can be reduced, and the assembly work can be easily performed at low cost. Further, the pump holder 8 is disposed at a position where the central axis thereof is deviated from the central axis of the lid member 2, and the liquid level is detected at a portion on the outer surface of the pump holder 8 where the filter housing portion 11 is not disposed. Since the device mounting portion 17 is provided, an installation space for the liquid level detection device mounting portion 17 of the thermistor 16 can be secured, and the thermistor 16 can be mounted efficiently. Moreover, since the filter housing portion 11 is formed in an arc shape along the inner diameter of the lid member 2, a large filter housing space in the filter housing portion 11 can be secured.

  Further, in the present embodiment, since the filter holder 11 side is closed by the side wall of the fuel pump 4 so as to form a housing space for the filter housing portion 11, The wall surface on the pump holder 8 side becomes unnecessary, the filter housing space of the filter housing portion 11 can be increased, and the weight of the pump holder 8 and the filter housing portion 11 can be reduced.

  Furthermore, since the chamber 14 is formed by the pump holder 8, the filter housing portion 11 and the lid member 2, and a certain amount of fuel can be stored inside the chamber 14, the fuel liquid in the fuel tank Even when the surface is largely inclined, it is possible to reliably prevent the occurrence of fuel exhaustion or the like.

  The present invention is not limited to the above embodiments, and various modifications can be made based on the gist of the present invention.

1 is a perspective view showing an embodiment of a fuel supply device according to the present invention. It is a longitudinal section showing an embodiment of a fuel supply device concerning the present invention. It is a top view of the pump holder and filter accommodating part which shows embodiment of the fuel supply apparatus which concerns on this invention. It is a cross-sectional view of a pump holder and a filter housing portion showing an embodiment of a fuel supply device according to the present invention. It is a disassembled perspective view which shows the detail of the liquid level detection apparatus attaching part in the fuel supply apparatus which concerns on this invention. It is a perspective view which shows the detail of the liquid level detection apparatus attaching part in the fuel supply apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus 2 Cover member 4 Fuel pump 5 Pump support member 6 Fuel discharge path 7 Fuel discharge pipe 8 Pump holder 9 Suction port 10 Discharge port 11 Filter accommodating part 13 Fuel supply port 14 Chamber 15 Filter 16 Thermistor 17 Liquid level detection apparatus Mounting portion 18 Engagement support member 19 Flange portion 20 Groove portion 21 Engagement claw 22 Holding plate 23 Elastic portion 24 Engagement piece 25 Engagement hole 27 Ground terminal 28 Fuel piping 29 Pressure adjustment valve 30 Return opening 31 Return piping

Claims (2)

A lid member for closing the bottom opening of the fuel tank;
A pump holder mounted on an inner portion of the fuel tank of the lid member and holding a fuel pump together with the lid member;
A filter connected to the suction port of the fuel pump for filtering fuel;
A filter housing for housing the filter;
A liquid level detection device for detecting a fuel liquid level position in the fuel tank;
In a fuel supply device comprising:
The pump holder is disposed at a position where its central axis is deviated from the central axis of the lid member, and the filter housing portion is formed in an arc shape along the inner diameter of the lid member and is integrated with the pump holder. Is formed,
A fuel supply device, wherein a liquid level detecting device mounting portion is integrally provided on a portion of the outer surface of the pump holder where the filter housing portion is not disposed. 2. The fuel supply device according to claim 1, wherein the pump holder side of the filter housing portion is closed by a side wall of the fuel pump to form a housing space for the filter housing portion.

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