JP2006057603A - Fuel supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit vapor or air staying portions from being formed on a suction filter in a fuel supply system. <P>SOLUTION: A filter cover 8 is installed above the suction filter 7 equipped on a suction side of a fuel pump 5 for inhibiting a mesh part 10 (in particular an upper mesh 10a) from being deformed and from being formed with the vapor or air staying portions. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel supply apparatus.

  Conventionally, various fuel supply devices have been proposed. Patent Document 1 discloses a fuel pump as an example.

  The fuel supply device of Patent Document 1 is configured on the inner side (inside the fuel tank) attached so as to close the opening provided in the fuel tank, and the fuel in the fuel tank is removed using a fuel pump. And discharging from a feed pipe protruding from the surface of the lid.

In this fuel supply device, a suction filter is mounted on the suction side of the fuel pump in order to suppress dust from entering the fuel pump. The suction filter is formed in a bag shape by pasting together a plurality of resin meshes, with the fuel pump suction port facing the inside of the bag-like mesh, and fuel that has permeated from the outside to the inside of the bag-like mesh. It is designed to be sucked into the fuel pump.
JP 2002-39030 A

  However, as shown in FIG. 7, in this type of conventional fuel supply device 19, the outer edge of the bag-like suction filter 20 may be warped upward, and vapor or air is formed in the portion A where the warp has turned into a bag path. In some cases, the vapor or air stays and is sucked into the fuel pump 21, causing torque fluctuation in the fuel pump 21, or abnormal noise or vibration.

  The present invention has been made in view of the above circumstances, and an object thereof is to suppress the formation of a vapor or air retention portion in a suction filter in a fuel supply device.

  In order to achieve the above object, the invention of claim 1 includes a fuel pump that sucks and discharges fuel in a fuel tank, and a sheet-like mesh provided on the suction side of the fuel pump for capturing dust. A fuel supply device including a suction filter is provided with a mesh deformation preventing mechanism that suppresses deformation of the mesh and formation of a vapor or air retention portion.

  According to a second aspect of the present invention, in the fuel supply device, the suction includes a fuel pump that sucks and discharges fuel in the fuel tank, and a sheet-like mesh provided on the suction side of the fuel pump for capturing dust. It is intended to include a filter and a filter cover that is provided on the upper side of the suction filter and suppresses the deformation of the mesh and the formation of a vapor or air retention portion.

  According to a third aspect of the present invention, in the second aspect of the present invention, the filter cover is detachable from a fuel pump or a suction filter.

  According to the invention of claim 1, since the mesh deformation preventing mechanism that suppresses the deformation of the mesh and the formation of the vapor or air retention portion is provided, the vapor and air are less likely to stay in the suction filter. It is possible to suppress the occurrence of torque fluctuation or abnormal noise or vibration in the fuel pump.

  According to the second aspect of the present invention, the filter cover is provided on the upper side of the suction filter so as to prevent the mesh from being deformed and the vapor or air staying portion from being formed. Therefore, it is possible to suppress the vapor and air from staying, and to suppress the torque fluctuation in the fuel pump and the generation of abnormal noise and vibration.

  According to the invention of claim 3, since the filter cover is detachably attached to the fuel pump or the suction filter, the filter cover can be easily attached / detached as necessary, each with and without the filter cover. As compared with the case where a suction filter or a fuel pump is configured, the manufacturing cost can be reduced.

  (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a system for supplying fuel to an automobile engine as an internal combustion engine is illustrated.

  FIG. 1 is a diagram illustrating a schematic configuration of a system including a fuel supply device according to the present embodiment. As shown in the figure, the fuel supply device 1 is attached to a fuel tank 2 mounted on a vehicle.

  The fuel supply device 1 is fixed to the upper wall 2a of the fuel tank 2 and hangs down inside the fuel tank 2, and includes a main body 3 as a lid, a chamber 4, a fuel pump 5, a fuel filter 6, A regulator (not shown) is provided. In the present embodiment, components such as the fuel pump 5 and the fuel filter 6 are assembled to the main body portion 3 and inserted into the accommodating portion inside the chamber 4 from above.

  FIG. 2 is a longitudinal sectional view of the fuel supply device. As shown in the figure, in this fuel supply device 1, a suction filter 7 is mounted on the lower side (suction side) of the fuel pump 5, and clean fuel from which dust has been removed is introduced into the fuel pump 5. It is made to do. In this embodiment, a filter cover 8 serving as a mesh deformation preventing mechanism is attached to the upper side of the suction filter 7.

  FIG. 3 is a plan view (top view) showing a suction filter and a filter cover attached thereto, and FIG. 4 is a longitudinal sectional view of FIG.

  The suction filter 7 includes a base portion 9, a mesh portion 10, a bottom portion 11, and a spring 12.

  The base portion 9 includes a disk-shaped top plate portion 9a and a tubular portion 9b extending upward from the top plate portion 9a. The inner tube portion of the tubular portion 9b passes through the top plate portion 9a as it is, and the base portion A through-hole 9 c that penetrates up and down 9 is formed. The suction pipe 5a of the fuel pump 5 is press-fitted into the upper part of the through hole 9c, while the protrusion 5b at the bottom of the fuel pump 5 is inserted into the through hole 9e of the fastening flange part 9d that projects sideways at the upper part of the tubular part 9b. Then, the ring 13 (FIG. 2) biting into the protrusion 5b prevents the protrusion 5b from coming out of the through hole 9e, and the suction filter 7 is fixed to the fuel pump 5 by such press-fitting and retaining.

  The mesh portion 10 is formed by welding or adhering the outer peripheral edges of the two sheet-like meshes 10a and 10b made of resin to each other while forming a through hole at a substantially central portion of the upper mesh 10a. The inner peripheral edge of the through hole is sandwiched by the outer peripheral edge of the top plate portion 9a, thereby forming a bag shape below the top plate portion 9a.

  Further, in the present embodiment, the disc-shaped bottom portion 11 is attached to the substantially central portion of the lower mesh 10b, and the winding diameter changes between the upper surface of the bottom portion 11 and the lower surface of the top plate portion 9a. The trapezoidal spring 12 is interposed in a side view so that the bag-like mesh portion 10 swells in the vertical direction. As a result, even if the distance between the upper surface and the bottom surface of the fuel tank 2 changes and the distance between the bottom portion of the fuel pump 5 and the bottom surface of the chamber 4 changes, the bottom portion 11 is brought into contact with the bottom surface of the chamber 4 by the biasing force of the spring 12. Pressed up.

  The filter cover 8 covers the mesh 10 a above the suction filter 7 above the suction filter 7. Thus, by providing the filter cover 8 that covers the upper side of the mesh part 10, the mesh part 10 interferes with other parts (for example, the inner wall of the chamber 4) in the fuel supply device 1 or deteriorates with time. Even in such a case, the mesh portion 10 is unlikely to be formed with a portion that swells upward (that is, a portion where vapor or air stays).

  Specifically, the filter cover 8 is provided with a plurality of ribs 15 extending radially downward from the plate-like substrate portion 14, and the lower ends of the ribs 15 are connected to the annular frame 16. Here, if the entire upper surface of the suction filter 7 is covered with the filter cover 8, it is difficult for fuel to enter the mesh portion 10 from the covered portion, and the suction resistance of the fuel pump 5 may increase. Therefore, in the present embodiment, the portion where the filter cover 8 covers the mesh portion 10 is configured by the skeleton members (the ribs 15 and the frames 16) so that the fuel flows through the gaps of the skeleton members, and the suction resistance of the fuel pump 5 Is suppressed from increasing.

  Further, a through hole 14 a into which the tubular portion 9 b of the suction filter 7 can be loosely inserted is provided in the substantially central portion of the substrate portion 14 of the filter cover 8. Then, the filter cover 8 is lowered while loosely inserting the tubular portion 9b into the through hole 14a, the substrate portion 14 is brought into contact with the upper surface of the top plate portion 9a of the suction filter 7, and the clip 17 is used to attach the tubular portion 9b. Locked. That is, in this embodiment, the filter cover 8 is detachable from the suction filter 7.

  As shown in FIG. 3, in this embodiment, the mesh part 10 of the suction filter 7 has a shape (octagonal shape) in which four corners of a rectangle are chamfered in a plan view. In accordance with the shape of the inner wall 4a of the chamber 4, the interference with the inner wall is prevented as much as possible. Moreover, the joint part of the outer periphery of the mesh part 10 is located below the frame 16 of the filter cover 8, and the outer periphery of the mesh part 10 is prevented from warping upward over the entire region. .

  Further, as shown in FIG. 4, an anti-vibration rubber 18 is provided between the top plate portion 9 a of the suction filter 7 and the substrate portion 14 of the filter cover 8, and sound and vibration due to rattling of the filter cover 8 and the like. Is suppressed.

  As described above, according to the present embodiment, the filter cover 8 is provided as a mesh deformation prevention mechanism, and the mesh portion 10 (particularly the upper mesh 10a) of the suction filter 7 is prevented from being deformed. Vapor and air accumulate in a staying portion (for example, A in FIG. 7) formed in the suction filter formed by deformation, and the accumulated vapor and air are sucked into the fuel pump 5 to cause torque fluctuation, abnormal sound, and vibration. It is possible to suppress the occurrence of such a situation.

  In addition, according to the present embodiment, the mesh deformation prevention mechanism is the filter cover 8 having a relatively simple configuration that covers the upper side of the suction filter 7, so that the above-described effect can be obtained while the manufacturing cost is kept relatively low. be able to.

  Furthermore, according to the present embodiment, the filter cover 8 is detachably attached to the suction filter 7, so that the filter cover 8 can be easily attached and detached as necessary, with and without the filter cover 8. Compared to the case where the suction filter 7 is configured separately for each, the manufacturing cost can be reduced.

  (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a plan view of a suction filter integrated with a filter cover mounted on the fuel supply apparatus according to the present embodiment, and FIG. 6 is a side view of the suction filter. Note that the suction filter 7A according to the present embodiment includes the same components as the suction filter 7 according to the first embodiment. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  The suction filter 7A according to the present embodiment is an integrated suction filter and filter cover. That is, as in the first embodiment, the filter cover 8A is provided with a plurality of ribs 15A extending radially downward from the plate-like substrate portion 14A, and the lower ends of the ribs 15A are connected to the annular frame 16A. Yes. However, in the first embodiment, the frame 16 has a curved shape, but in the present embodiment, in consideration of the moldability of the meshes 10a and 10b, the shape of the four corners of the rectangle is chamfered (octagonal shape). is there.

  In the present embodiment, the mesh 10a is bonded to the back surface (lower surface) of the filter cover 8A by bonding or the like, while the mesh 10a and the mesh 10b are bonded together at the outer peripheral edges to integrate the filter cover 8A. A mesh portion 10 is formed.

  In addition, the mesh part 10 is provided with the bottom part 11 and the spring (not shown in FIG. 6) similarly to the said 1st Embodiment.

  According to the present embodiment, since the filter cover 8A is integrated with the suction filter 7A, there is an effect that the number of assembling steps can be reduced compared to the first embodiment.

  The present invention can be embodied in another embodiment as follows. In other embodiments described below, the same operations and effects as in the above embodiments can be obtained.

  (1) In the first embodiment, the filter cover is detachably attached to the suction filter. Alternatively, the filter cover may be detachably attached to the bottom of the fuel pump.

  (2) In the above embodiment, the case where the fuel pump is mounted on the main body functioning as the lid portion of the fuel tank is illustrated. However, the present invention is a drooping device positioned inside the fuel tank with respect to the lid portion. It is also possible to implement a configuration in which the fuel pump is mounted on the hanging portion and the fuel pump is disposed completely independently of the lid portion.

  Further, technical ideas other than the claims that can be grasped from the above embodiment will be described together with the effects thereof.

  (A) In the fuel supply device according to claim 2 or 3, it is preferable that the filter cover is constituted by using a plurality of skeleton members, and the fuel is circulated through the gaps between the skeleton members.

  In this way, it is possible to prevent the suction resistance of the fuel pump from increasing due to the filter cover.

1 is a schematic configuration diagram of an entire system including a fuel supply device according to an embodiment of the present invention. 1 is a longitudinal sectional view of a fuel supply device according to a first embodiment of the present invention. The top view of the suction filter and filter cover which are contained in the fuel supply apparatus concerning 1st Embodiment of this invention. The longitudinal cross-sectional view of the suction filter and filter cover which are contained in the fuel supply apparatus concerning 1st Embodiment of this invention. The top view of the suction filter and filter cover which are contained in the fuel supply apparatus concerning 2nd Embodiment of this invention. The side view of the suction filter and filter cover which are contained in the fuel supply apparatus concerning 2nd Embodiment of this invention. The longitudinal cross-sectional view of the conventional fuel supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel supply apparatus 2 Fuel tank 5 Fuel pump 7, 7A Suction filter 8, 8A Filter cover (mesh deformation prevention mechanism)
10a, 10b mesh

Claims (3)

A fuel pump for sucking and discharging the fuel in the fuel tank;
A suction filter provided on the suction side of the fuel pump and having a mesh for capturing dust;
A fuel supply device comprising:
A fuel supply apparatus comprising a mesh deformation prevention mechanism that suppresses deformation of the mesh and formation of a vapor or air retention portion. A fuel pump for sucking and discharging the fuel in the fuel tank;
A suction filter provided on the suction side of the fuel pump and having a mesh for capturing dust;
A filter cover which is provided on the upper side of the suction filter and prevents the mesh from being deformed to form a vapor or air retention part;
A fuel supply device comprising: The fuel supply device according to claim 2, wherein the filter cover is detachably attached to a fuel pump or a suction filter.

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