JP5096838B2 - Fuel supply device - Google Patents

Description

  The present invention relates to a fuel supply device including a fuel pump that supplies fuel in a fuel tank to an engine or the like.

  Conventionally, as this type of technology, a fuel supply device described in Patent Document 1 below is known. This device includes a lid member that covers an opening formed in a fuel tank, a fuel pump that is provided in the fuel tank and is driven by a motor, and a liquid that detects the height of the fuel level in the fuel tank. A level gauge, a liquid level gauge control circuit that processes an output signal from the liquid level gauge, and a pump control circuit that drives and controls the fuel pump are provided, and the pump control circuit is installed on the lid member.

JP 2004-332582 A

  By the way, in recent years, in order to ensure the weight reduction of the vehicle and the degree of freedom of the shape of the fuel tank, the fuel tack has been increasingly used as a resin molded product. Here, when the fuel supply device described in Patent Document 1 is provided in a resin fuel tank or the lid member is formed of resin, electric noise generated from a fuel pump (the motor) in the fuel tank. (Radio noise) cannot be shielded by the fuel tank itself, and the pump control circuit may be adversely affected by electrical noise. For example, there is a concern that the pump control circuit may malfunction the fuel pump due to the adverse effects of electrical noise, or that the pump control circuit may further amplify the received electrical noise.

  Further, in recent years, fuel tanks in recent years are mainly mounted under seat seat surfaces in vehicles. Here, the upper surface of the fuel tank is a metal seat surface, the outer periphery of the side surface is covered with a metal body, and the fuel tank is shielded. However, in the case of a resin fuel tank, if there is no metal member such as a metal plate from the upper side of the fuel tank due to a change in the mounting location or resinization of the seat seat surface, the upper side of the fuel tank cannot be shielded, It becomes impossible to avoid the adverse effect of the electric noise generated from the fuel pump on the passenger compartment.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent electrical noise generated from the fuel pump from being adversely affected to the outside, and in addition to the metal plate on the upper side of the fuel tank in the vehicle. An object of the present invention is to provide a fuel supply device that can prevent the adverse effect of electrical noise on the passenger compartment even without a metal member.

In order to achieve the above object, the invention according to claim 1 is a fuel supply device comprising a fuel pump driven by a motor, a case covering the outer periphery of the fuel pump, and a cup for housing the fuel pump and the case. In the above, a shield material is provided in the cup to shield the electrical noise generated from the fuel pump in all directions , and the shield material is made of metal and provided outside or inside the cup, or integrated with the cup by insert molding. The purpose of this is

  According to the configuration of the above invention, even if the fuel supply device is provided in the resin fuel tank, the electric noise generated from the fuel pump is omnidirectionally shielded by the shielding material provided in the cup, and the electric noise Leakage is reduced. Further, since the shield material is provided on the cup, it is not necessary to separately provide a shield material in the fuel tank or the like, and it is easy to secure a space for the shield material and to work.

In order to achieve the above object, the invention described in claim 2 is that, in the invention described in claim 1, the shield material is a metal net.

In order to achieve the above object, the invention described in claim 3 is that, in the invention described in claim 2, the outer periphery of the cup is covered with a metal net.

In order to achieve the above object, a fourth aspect of the present invention is the invention according to the first or second aspect , wherein the shielding material is provided on the entire outside of the cup.

According to the configuration of the invention described above, in addition to the operation of the invention according to claim 1 or 2 , it is also possible to retrofit the shield material to the entire outside of the cup after the fuel pump and the case are accommodated in the cup.

To achieve the above object, the invention according to claim 5 is the invention according to claim 4 , wherein the upper side of the cup is covered with the first shield material, and the portions other than the upper side of the cup are covered with the first shield material. It is intended that it is covered with a second shield material different from the above.

According to the configuration of the above invention, in addition to the operation of the invention according to claim 4 , the upper part of the cup is appropriately processed by the first shield material alone, so that the piping and wiring coming out from the upper side of the cup Thus, the upper side of the cup can be covered with the first shield material. Portions other than the upper side of the cup can be appropriately covered with the second shield material.

According to the first to third aspects of the present invention, even when the fuel supply device is provided in the resin fuel tank, it is possible to prevent the adverse influence of the electric noise generated from the fuel pump to the outside. Compact and easy countermeasures against electrical noise. In addition, even if there is no metal member such as a metal plate on the upper side of the fuel tank in the vehicle, it is possible to prevent an adverse effect of electrical noise on the vehicle interior.

According to the invention described in claim 4 , in addition to the effect of the invention described in claim 1 or 2 , the shield material can be provided in the cup in the final process, and the manufacture of the fuel supply device can be facilitated. .

According to the invention described in claim 5 , in addition to the effect of the invention described in claim 4 , the upper side of the cup can be easily covered with the first shield material.

  Hereinafter, an embodiment in which the fuel supply device of the present invention is embodied as a “fuel pump unit” will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view showing a fuel pump unit 1 according to this embodiment. The fuel pump unit 1 includes a unit upper part 2 and a unit lower part 3. The fuel pump unit 1 is installed and used in a resin fuel tank 4. The unit lower part 3 includes a bottomed cylindrical (that is, substantially cup-shaped) reserve cup 5, a primary filter 6, a fuel pump 7, a pressure regulator 8, and a secondary filter 9. The primary filter 6, fuel pump 7, pressure regulator 8 and secondary filter 9 are accommodated in the reserve cup 5, positioned and assembled.

  The primary filter 6 includes a nylon bag-like filter and a resin skeleton inserted in the bag. The internal space of the bag filter communicates with the suction hole of the fuel pump 7. The primary filter 6 is accommodated in the reserve cup 5 and is disposed along the bottom surface of the cup 5. Foreign matters in the fuel are generally removed by the primary filter 6 and further removed by a secondary filter 9 described later. The fuel from which foreign matters are substantially removed by the primary filter 6 is sucked into the fuel pump 7.

  As shown in FIG. 1, the fuel pump 7 has a substantially vertical cylindrical shape, and has a fuel suction pipe (not shown) at the bottom thereof. A primary filter 6 is connected to the fuel intake pipe. An electrical connector 11 and a fuel discharge pipe 12 are provided at the upper end of the fuel pump 7. The fuel pump 7 has a built-in motor 13 and is driven when the motor 13 is energized through the electrical connector 11. The fuel in the reserve cup 5 is sucked from the primary filter 6 to increase the pressure, and is discharged from the fuel discharge pipe 12. It is designed to discharge.

  The fuel discharge pipe 12 is connected to the pressure regulator 8. The pressure regulator 8 is a relief valve that maintains the fuel pressure in the fuel discharge pipe 12 at a predetermined value. The pressure regulator 8 adjusts the pressure of the fuel supplied to the secondary filter 9 and consequently the pressure of the fuel supplied to the engine to a predetermined value. The fuel released from the pressure regulator 8 by adjusting the fuel pressure is returned into the reserve cup 5 via a return pipe and a jet pump (both not shown). The pressure regulator 8 is housed in a mounting portion 15 for the pressure regulator 8 formed in the filter cover 14 described later, and is prevented from being detached by assembling the cap 16 to the mounting portion 15.

  The fuel pump 7 is installed at the center of the secondary filter case 17. The secondary filter 9 has a donut shape, and the fuel pump 7 is accommodated in the secondary filter case 17. As a result, the outer periphery of the fuel pump 7 is covered with the secondary filter case 17. The upper opening of the secondary filter case 17 is covered with the filter cover 14. The secondary filter case 17 and the filter cover 14 are each molded from resin. The secondary filter case 17 is divided into an inner chamber and an outer chamber by the secondary filter 9. The fuel discharge pipe 12 communicates with the outer chamber of the secondary filter case 17. A fuel supply pipe 18 is connected to the filter cover 14. A fuel supply pipe 18 communicates with the inner chamber of the secondary filter case 17. The fuel discharged from the fuel pump 7 reaches the inner chamber of the secondary filter case 17 from the outer chamber of the secondary filter case 17 through the secondary filter 9 and flows to the fuel supply pipe 18. The fuel supply pipe 18 extends through the unit upper portion 2 and out of the fuel tank 4. In the case of this embodiment, the fuel supply pipe 18 is connected to an injector (not shown) via a delivery pipe (not shown) provided in an engine (not shown). The fuel pressurized by the fuel pump 7, adjusted to a constant pressure by the pressure regulator 8, and foreign matter removed by the primary filter 6 and the secondary filter 9 is supplied to the injector through the fuel supply pipe 18 and the delivery pipe. Is done. The fuel pump 7 is inserted and accommodated in the hollow portion of the secondary filter case 17 from the bottom opening. A stay 19 is assembled to the bottom of the secondary filter case 17, and the stay 19 prevents the fuel pump 7 from coming off the secondary filter case 17. A cushion rubber 20 is interposed between the fuel pump 7 and the stay 19, and the fuel pump 7 is elastically supported.

  As shown in FIG. 1, the unit upper part 2 includes a unit cover 21 molded from resin and a pump controller 22 provided on the unit cover 21. The unit cover 21 is fixed to the upper wall 4a of the fuel tank 4, and covers a disk part 21a that closes the mounting hole 4b of the fuel tank 4, a cylindrical skirt part 21b that protrudes from the lower surface of the disk part 21a, It includes a pair of guide rails 21c and 21d extending downward from the skirt portion 21b. The skirt portion 21 b is formed so as to be fitted into the mounting hole 4 b of the fuel tank 4. By mounting the unit cover 21 so as to close the mounting hole 4b of the fuel tank 4, the fuel pump unit 1 is installed in the fuel tank 4 and positioned. The outer peripheral edge portion of the disk portion 21a of the unit cover 21 is joined to the edge portion of the attachment hole 4b of the fuel tank 4 via a seal gasket (not shown), and the bolt ( (Not shown). As a result, the unit cover 21 is fixed to the fuel tank 4. The pump controller 22 is housed and fixed in a housing portion 21 e formed in the unit cover 21. A harness 30 </ b> A extending from the fuel pump 7 is connected to the pump controller 22 on the lower surface side of the unit cover 21. In addition, a power supply harness 30 </ b> B is connected to the pump controller 22 on the upper surface side of the unit cover 21. The harness 30B is connected to a battery or the like that is a vehicle-mounted power source.

  FIG. 2 shows the unit cover 21 in a side view. FIG. 3 is a front view of the unit cover 21. FIG. 4 is a perspective view showing the relationship between one guide rail 21 c and the reserve cup 5. As shown in FIGS. 2 and 3, the skirt portion 21b of the unit cover 21 is formed with a pair of guide rails 21c and 21d that form a flat plate extending downward. Each guide rail 21c, 21d is formed with a long hole 23 extending in the longitudinal direction at the center thereof. A circular hole 24 is formed at the upper end of the long hole 23, and both sides of the hole 24 are thin portions 25. A pair of slits 26 extending upward from the lower ends are formed at the lower ends of the guide rails 21c and 21d. The slits 26 are formed on both sides of the long hole 23.

  As shown in FIGS. 1 and 4, the reserve cup 5 is formed with a pair of slots 27a and 27b having a sheath shape corresponding to the guide rails 21c and 21d. Corresponding guide rails 21c and 21d are movably assembled to the slots 27a and 27b. As the slots 27a and 27b move relative to each other along the guide rails 21c and 21d, the reserve cup 5 slides along the guide rails 21c and 21d, and approaches or separates from the unit cover 21. ing. Tapered protrusions 28a and 28b are formed in the slots 27a and 27b. Each protrusion 28a, 28b is configured to allow sliding in one direction with respect to each guide rail 21c, 21d. When the reserve cup 5 is assembled to the unit cover 21, the guide rails 21c and 21d are elastically deformed to get over the protrusions 28a and 28b. In normal use, the projections 28a and 28b are engaged with the end portions of the long holes 23 of the guide rails 21c and 21d so that the unit cover 21 and the reserve cup 5 are not separated from each other.

  A metal plate 29 is disposed inside each slot 27a, 27b. The metal plate 29 suppresses generation of abnormal noise or the like when the guide rails 21c and 21d and the slots 27a and 27b that receive the guide rails 21c and 21d are in sliding contact with each other. As the metal plate 29, for example, stainless steel that does not easily corrode can be used.

  A compression spring (not shown) is interposed between the unit cover 21 and the reserve cup 5, and the reserve cup 5 is urged toward the bottom wall 4 c of the fuel tank 4 by the spring. The fuel tank 4 is blow-molded with resin and may be slightly deformed due to changes in the amount of remaining fuel and the temperature. The reserve cup 5 is always urged to abut against the bottom wall 4 c of the fuel tank 4 against deformation of the fuel tank 4.

  By the way, in this embodiment, although the fuel pump unit 1 is provided in the fuel tank 4, since the fuel tank 4 is made of resin, electricity generated from the fuel pump 7 (the motor 13) of the fuel pump unit 1 is used. Noise (radio noise) cannot be shielded by the fuel tank 4. According to the metal fuel tank that has been used in the past, the electric noise generated from the fuel pump is a problem when the fuel pump is provided in the metal fuel tank because the metal fuel tank itself can exert a shielding function against the electric noise. Did not become. However, since the resin fuel tank 4 itself does not have a shielding function as in this embodiment, it is necessary to take measures against electrical noise generated from the fuel pump 13 provided in the fuel tank 4. Therefore, in this embodiment, the fuel pump unit 1 is provided with a configuration for measures against electric noise. Hereinafter, the configuration will be described.

  FIG. 5 is a schematic sectional view of the fuel pump unit 1. As described above, the fuel pump unit 1 includes the fuel pump 7, the secondary filter case 17 that covers the outer periphery of the fuel pump 7, and includes the secondary filter 9, the fuel pump 7, the secondary filter case 17, and the like. A reserve cup 5 for storing the fuel, a unit cover 21 assembled to the upper portion of the reserve cup 5, and a pump controller 22 provided on the unit cover 21 for driving and controlling the fuel pump 7. In the fuel pump unit 1 of this embodiment, a first shield material 31 and a second shield material 32 for shielding electrical noise generated from the fuel pump 7 are provided on the entire outside of the reserve cup 5. In this embodiment, the upper side of the reserve cup 5 is covered with the first shield material 31, and the portions other than the upper side of the reserve cup 5, that is, the outer peripheral wall and the bottom wall of the reserve cup 5 are different from the first shield material 31. It is covered with another second shield material 32. The outer peripheral edge of the first shield material 31 is in contact with the upper outer periphery of the second shield material 32. From the upper side of the reserve cup 5, wiring such as the harness 30 </ b> A, piping such as the fuel supply pipe 18, and guide rails 21 c and 21 d come out. Therefore, in order to provide the first shield member 31, It is necessary to avoid interference. In this embodiment, interference with the protrusion can be avoided by appropriately processing the first shield material 31 alone. For example, it can be considered to appropriately cut the first shield material 31 to avoid interference with the projections. Here, a metal net or the like can be used as the first shield material 31. As the second shield member 32, the reserve cup 5 is formed of a conductive resin material, a metal net is insert-molded on the reserve cup 5, metal plating is applied to the surface of the reserve cup 5, and the outer periphery of the reserve cup 5 It may be possible to cover the wall with a metal net. As the conductive resin material, for example, a metal material such as “SUS filler” may be mixed with the resin material. For example, it is conceivable to use a metal such as “chromium-plated iron, SUS” as the metal net. As metal plating, for example, it is conceivable to use a metal such as “electroless copper, electroless nickel”.

  In this embodiment, the pump controller 22 includes a pump drive circuit 33 for driving and controlling the fuel pump 7, and the drive circuit 33 is provided with electric filters 34 and 35. In this embodiment, a pump-side electric filter 34 is provided between the pump drive circuit 33 and the fuel pump 7 on the pump connection side of the pump drive circuit 33, that is, the side connected to the fuel pump 7. A power supply side electric filter 35 is provided on the power supply connection side of the circuit 33, that is, the side connected to the in-vehicle battery. In this embodiment, each electric filter 34, 35 is configured by an LC filter.

  In this embodiment, the shield members 31 and 32 are grounded. That is, the first shield material 31 is connected to the pump drive circuit 33 via the ground wire 36, whereby the shield materials 31 and 32 are grounded.

  According to the configuration related to the electric noise countermeasure of the fuel pump unit 1 of this embodiment described above, even if the fuel pump unit 1 is provided in the resin fuel tank 4, the electric noise generated from the fuel pump 7 is not generated. Shielded by the shield materials 31 and 32, leakage of electrical noise to the outside is reduced. For this reason, even if the fuel pump unit 1 is provided in the resin fuel tank 4, it is possible to prevent adverse effects of electrical noise generated from the fuel pump 7 on the outside. That is, it is possible to prevent this electrical noise from adversely affecting on-vehicle electrical equipment. In particular, in this embodiment, since the shield materials 31 and 32 are provided in the reserve cup 5, it is not necessary to separately provide a shield material in the fuel tank 4 and the like, and space for each shield material 31 and 32 can be secured and worked. Easy. For this reason, it is possible to realize an electrical noise countermeasure that is relatively compact and easy. Further, in this embodiment, since the shield materials 31 and 32 are provided on the entire outside of the reserve cup 5, leakage of electrical noise directed in all directions around the fuel pump 7 is reduced. In particular, since the upper side of the reserve cup 5 is covered with the first shield material 31, the member between the fuel tank 4 and the passenger compartment is resinized and made of a metal plate material in a state where the fuel tank 4 is mounted on the vehicle. Even if it is not partitioned, it is possible to take measures against electrical noise leaking upward from the fuel pump unit 1, and to prevent adverse effects of electrical noise on the passenger compartment.

  In this embodiment, since the shield members 31 and 32 are provided on the entire outside of the reserve cup 5, the fuel pump 7 and the secondary filter case 17 are accommodated in the reserve cup 5, and then on the entire outside of the reserve cup 5. Each shield material 31, 32 can be retrofitted. For example, when each shield material 31 and 32 is each comprised with a metal mesh, it becomes possible to cover the whole outer side of the reserve cup 5 later by these metal meshes. For this reason, each shield material 31 and 32 can be provided in the reserve cup 5 in the final process, and manufacture of the fuel pump unit 1 can be made easy.

  In this embodiment, the upper side of the reserve cup 5 is covered with the first shield material 31, and the outer periphery and bottom wall portions of the reserve cup 5 are covered with the second shield material 32. Accordingly, the upper portion of the reserve cup 5 is formed by appropriately processing the first shield member 31 alone, thereby providing piping such as the fuel supply pipe 18 and the wiring of the harness 30 </ b> A and the like that are routed from the upper side of the reserve cup 5. It becomes possible to cover the upper side of the reserve cup 5 with the first shield material 31 while avoiding interference with the rails 21c and 21d. Further, the outer periphery and the bottom wall portion of the reserve cup 5 can be appropriately covered with the second shield material 32. For this reason, the upper side of the reserve cup 5 can be easily covered with the first shield material 31. In this sense, the entire reserve cup 5 can be easily covered with the shield materials 31 and 32 in order to shield the electrical noise in all directions.

  Moreover, in this embodiment, since the shielding material 31 is grounded, the shielding effect of electrical noise can be increased as compared with the case where it is not grounded. Furthermore, in this embodiment, since the electric filters 34 and 35 are provided in the pump drive circuit 33, amplification of electric noise in the pump drive circuit 33 is suppressed by the electric filters 34 and 35. In particular, since the power supply side electrical filter 35 is provided on the power supply connection side of the pump drive circuit 33, leakage of electrical noise from the pump drive circuit 33 to the outside can be suppressed. For this reason, the effect of reducing electrical noise can be enhanced by the amount corresponding to the power supply side electrical filter 35. Further, since the pump-side electric filter 34 is provided on the pump connection side of the pump drive circuit 33, intrusion of electric noise from the fuel pump 7 to the pump drive circuit 33 is suppressed by the pump-side electric filter 34. In this sense, the electric noise reduction effect can be further enhanced by the amount of the pump-side electric filter 34.

  In addition, this invention is not limited to the said embodiment, It can implement as follows by changing suitably a part of structure in the range which does not deviate from the meaning of invention.

  (1) In the embodiment described above, the shield materials 31 and 32 for shielding the electrical noise generated from the fuel pump 7 in all directions are provided outside the reserve cup 5. On the other hand, a shielding material for omnidirectional shielding of electrical noise generated from the fuel pump may be provided inside the reserve cup.

  (2) In the above-described embodiment, the shield material is divided into the first shield material 31 and the second shield material 32. However, the shield material may be configured as an integral body that is not divided into two.

  (3) In the above embodiment, the two electric filters 34 and 35 are provided in the pump drive circuit 33 of the pump controller 22, but the pump-side electric filter 34 is omitted from the two electric filters 34 and 35, or both The electric filters 34 and 35 can be omitted.

  (4) Although the shield members 31 and 32 are grounded in the embodiment, the grounding can be omitted.

  (5) In the above embodiment, the secondary filter case 17 having a built-in secondary filter is used as a case covering the outer periphery of the fuel pump 7. However, the present invention is not limited to this secondary filter case. It may be a case that simply covers.

Sectional drawing which shows a fuel pump unit. The side view which shows a unit cover. The front view which shows a unit cover. The perspective view which shows the relationship between a guide rail and a reserve cup. Sectional drawing which shows the outline of a fuel pump unit.

DESCRIPTION OF SYMBOLS 1 Fuel pump unit 4 Fuel tank 5 Reserve cup 7 Fuel pump 13 Motor 17 Secondary filter case 31 1st shield material 32 2nd shield material

Claims (5)

In a fuel supply device comprising: a fuel pump driven by a motor; a case that covers the outer periphery of the fuel pump; and a cup that houses the fuel pump and the case;
The cup is provided with a shielding material for omnidirectional shielding of electrical noise generated from the fuel pump ,
The fuel supply device according to claim 1, wherein the shield material is made of metal and provided outside or inside the cup, or provided integrally with the cup by insert molding . The fuel supply apparatus according to claim 1, wherein the shield material is a metal net. The fuel supply device according to claim 2, wherein an outer periphery of the cup is covered with the metal net. The fuel supply device according to claim 1 or 2, characterized in that a said shielding material on the entire outer side of the cup. Covers upper side of the cup by the first shielding member, according to the upper remaining portion of the cup to claim 4, characterized in that said first shield member covered by another second shield member Fuel supply device.

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