Fuel supply device

Abstract

To prevent the complication of a metal mold, to improve mold release performance, and to improve versatility.SOLUTION: A fuel supply device 1 attached to a fuel tank 2, and supplying fuel F in the fuel tank to the outside of the fuel tank comprises: a flange member 30 for covering an opening part 2b which is opened at a bottom wall 2a of the fuel tank; a fuel pump 10 arranged at a bottom part of the fuel tank in a horizontal state so as to progress along an arrangement face 30a of the flange part 32 which is exposed in the fuel tank; and a cylindrical pump accommodation member 20 for accommodating the fuel pump, and attached to the flange member. The fuel supply device also comprises a guide rail structure 100 for regulating an attachment direction in which the flange member and the pump accommodation member slide with each other, and attached to each other so as to progress along an arrangement face of a flange, and a snap fit structure 200 for regulating a position by making the flange member and the pump accommodation member locked to each other in a position being a slide terminal end of the attachment diction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fuel supply system. [Background technology]

[0002] For example, there is known a fuel supply device for a vehicle that supplies fuel from a fuel tank to an engine. As described in Patent Document 1, a fuel supply device disposed at the bottom of the fuel tank is known. The fuel supply device includes a fuel pump that draws fuel stored in the fuel tank through an intake port and pumps it to the engine, and a filter attached to the intake port to prevent foreign matter from entering the fuel pump.

[0003] The fuel supply device includes, for example, a cylindrical cup (exterior body) that houses a fuel pump and a pressure regulator attached to the cup. The fuel pump discharges fuel through a discharge port (fuel extraction pipe). The pressure regulator prevents the pressure of the fuel supplied from the fuel supply device to the internal combustion engine from becoming excessive. For this reason, the pressure regulator is provided midway in the flow path from the discharge port of the fuel pump to the internal combustion engine.

[0004] In this fuel supply device, the fuel pump and the cup (exterior body) are arranged with their axes parallel to the bottom of the fuel tank. The cup and the flange (lid member) that attaches the cup and pressure regulator to the tank are made of, for example, resin. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5554055 Summary of the Invention [Problem to be solved by the invention]

[0006] In the fuel supply device described in Patent Document 1, the cup and the flange are molded integrally. However, when a cylindrical pressure regulator having an axis extending from a flat flange and a cylindrical cup having an axis substantially parallel to the flange surface are integrally molded, the number of divisions of the mold, i.e., the number of slides required and their directions, increases, resulting in a problem of a complicated mold structure. At the same time, when the number of divisions of the mold increases, the number of locations where ejector pins cannot be easily positioned increases, which can lead to a problem of poor demoldability of the molded product.

[0007] In other words, the technology described in Patent Document 1 requires a complex mold structure, has limited freedom in ejector pin placement, and is poor in mold releasability, making it unrealistic to adopt such a structure as a fuel supply device. Furthermore, in the technology described in Patent Document 1, the cup and flange are molded as a single unit, which means that if the shape of the pump, particularly its outer diameter or discharge shape, is changed, the technology cannot be adapted as is, resulting in poor versatility.

[0008] The present invention has been made in consideration of the above circumstances, and aims to achieve the objectives of preventing the mold from becoming complicated, improving demolding properties, and improving versatility. [Means for solving the problem]

[0009] In order to solve the above problem, one aspect of the fuel supply device according to the present invention comprises: A fuel supply device attached to a fuel tank and supplying fuel from the fuel tank to the outside of the fuel tank, a flange member that covers an opening in a bottom wall of the fuel tank; a fuel pump disposed horizontally at a bottom of the fuel tank along a placement surface of the flange member exposed inside the fuel tank; a cylindrical pump housing member that houses the fuel pump and is attached to the flange member; Equipped with a guide rail structure that regulates the mounting direction in which the flange member and the pump accommodating member slide and are mounted to each other so that the mounting direction is along the arrangement surface of the flange member; a snap-fit ​​structure that engages the flange member and the pump accommodating member with each other at a position that is a sliding end in the mounting direction to restrict their positions; Equipped with.

[0010] In the above configuration, the guide rail structure and snap-fit ​​structure allow the flange member and the pump housing member to be attached by sliding relative to each other, so the flange member and the pump housing member can be molded as separate bodies. This simplifies the slide structure in the mold used to mold the flange member and the pump housing member, improves the flexibility of ejector pin placement, prevents the mold from becoming too complicated, reduces manufacturing costs by simplifying the mold structure, and improves productivity by improving demolding. At the same time, by making the flange member and the pump housing member separate, pump housing members of different shapes can be attached to the flange member. This allows for changes to the fuel pump to be accommodated simply by changing the shape of the pump housing member. Therefore, it is possible to easily accommodate pumps of different shapes, improving versatility.

[0011] The fuel supply device according to the present invention comprises: The guide rail structure includes: a vertical rail portion extending along the mounting direction and formed so as to protrude in a direction in which the flange member and the pump accommodating member face each other; a vertical guide portion that extends along the mounting direction, protrudes toward the vertical rail portion, is fitted to the vertical rail portion, and is slidable in the mounting direction along the vertical rail portion; a vertical guide rail structure that restricts the positions of the flange member and the pump accommodating member at least in the opposing direction, The vertical guide rail structure is The opposing ends of the vertical rail portions and the vertical guide portions are formed with protruding portions that protrude along the arrangement surface in a direction intersecting the mounting direction and are fitted together, one of the vertical rail portion and the vertical guide portion is formed on the flange member, and the other is formed on the pump accommodating member; It is possible.

[0012] The fuel supply device according to the present invention comprises: The vertical guide rail structure is At least one of the protruding portions has an inclined portion inclined so that the flange member and the pump accommodating member are closer to each other in the opposing direction at a slide end point than at a slide start point in the mounting direction. It is possible.

[0013] The fuel supply device according to the present invention comprises: The vertical guide rail structure is The protrusion of the vertical rail portion and the protrusion of the vertical guide portion are in contact with each other on a contact surface thereof, the contact surface of the protrusion formed on the flange member is formed in a flat shape along the mounting direction, The contact surface of the protrusion formed on the pump accommodating member has the inclined portion. It is possible.

[0014] The fuel supply device according to the present invention comprises: The guide rail structure includes: a lateral rail portion extending along the mounting direction and formed so as to protrude in a direction in which the flange member and the pump accommodating member face each other; a lateral guide portion extending along the mounting direction and projecting toward the lateral rail portion, the lateral guide portion abutting against the lateral rail portion in a direction intersecting the mounting direction; a lateral guide rail structure for regulating the positions of the flange member and the pump accommodating member in the intersecting direction, The horizontal guide rail structure is one of the lateral rail portion and the lateral guide portion is formed on the flange member, and the other is formed on the pump accommodating member; It is possible.

[0015] The fuel supply device according to the present invention comprises: The lateral guide rail structure is At least one of the lateral rail portion and the lateral guide portion has an inclined portion that is inclined so that the contact pressure between the lateral rail portion and the lateral guide portion in the intersecting direction is increased at a slide end point relative to a slide start point in the mounting direction. It is possible.

[0016] The fuel supply device according to the present invention comprises: The guide rail structure includes: The vertical guide rail structure and the horizontal guide rail structure are arranged parallel to each other and spaced apart in the intersecting direction. It is possible.

[0017] The fuel supply device according to the present invention comprises: The vertical guide rail structure is The cross-sectional profile of the vertical rail portion in the intersecting direction is formed into a substantially T-shape, the vertical guide portion is formed in a groove shape into which the vertical rail portion is slidably fitted, The protrusion of the vertical rail portion and the protrusion of the vertical guide portion are in contact with each other on a contact surface thereof, the contact surface of the protrusion formed on the flange member is formed in a plane that is aligned along the mounting direction and parallel to the placement surface, the contact surface of the protrusion formed on the pump accommodating member has an inclined portion that is inclined so that the flange member and the pump accommodating member are closer to each other in the opposing direction at a slide end rather than a slide start end in the mounting direction, and has an inclined surface that is inclined so as to move away from the arrangement surface toward the slide end rather than the slide start end in the mounting direction. It is possible.

[0018] The fuel supply device according to the present invention comprises: The snap-fit ​​structure is disposed at a position where a slide end of the lateral guide rail structure in the mounting direction is extended. It is possible.

[0019] The fuel supply device according to the present invention comprises: The flange member has: a fuel flow path that supplies fuel from the fuel tank to the outside of the fuel tank; a regulator accommodating portion that communicates with the fuel flow path and maintains a constant pressure in the fuel flow path, and that protrudes from the arrangement surface and that accommodates the fuel flow path; is formed, The snap-fit ​​structure is disposed at a position corresponding to a tip of the regulator accommodating portion in the opposing direction. It is possible.

[0020] The fuel supply device according to the present invention comprises: an opening portion that communicates the fuel flow path with the inside of the fuel tank is formed at a tip end of the regulator housing portion; a covering piece formed on the pump accommodating member, the covering piece overlapping the opening when viewed in the opposing direction at a locking position by the snap-fit ​​structure; It is possible.

[0021] The fuel supply device according to the present invention comprises: the covering piece has a gap with the edge of the opening when the covering piece is in the locked position by the snap-fit ​​structure; It is possible. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a fuel supply device that can prevent the mold from becoming complicated, improves mold releasability, and improves versatility. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a perspective view showing a first embodiment of a fuel supply device according to the present invention. [Figure 2] 1 is a cross-sectional view showing a first embodiment of a fuel supply device according to the present invention. [Figure 3] 1 is a perspective view showing a flange member in a first embodiment of a fuel supply device according to the present invention. [Figure 4] 1 is a perspective view showing a pump housing member in a first embodiment of a fuel supply device according to the present invention. [Figure 5] 1 is a perspective view showing a guide rail structure of a pump housing member in a first embodiment of a fuel supply device according to the present invention. FIG. [Figure 6] 1 is a cross-sectional view of an XY plane showing a vertical guide rail structure in a first embodiment of a fuel supply device according to the present invention. [Figure 7] 1 is a cross-sectional view of an XY plane showing a vertical guide rail structure in a first embodiment of a fuel supply device according to the present invention. [Figure 8] 1 is a cross-sectional view of a YZ plane showing a vertical guide rail structure in a first embodiment of a fuel supply device according to the present invention. [Figure 9] 1 is a cross-sectional view of an XY plane showing a guide rail structure in a first embodiment of a fuel supply device according to the present invention. [Figure 10] 4 is a cross-sectional view taken along the YZ plane showing another example of the vertical guide rail structure in the first embodiment of the fuel supply device according to the present invention. FIG. [Figure 11] 4 is a cross-sectional view taken along the YZ plane showing another example of the vertical guide rail structure in the first embodiment of the fuel supply device according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] A first embodiment of a fuel supply device according to the present invention will be described below with reference to the drawings. Fig. 1 is a perspective view showing a fuel supply device according to this embodiment, and Fig. 2 is a cross-sectional view showing the fuel supply device according to this embodiment. In the figures, reference numeral 1 denotes the fuel supply device. In the following description, the central axis of the fuel pump 10 described later is referred to as the central axis C (see FIG. 2), the direction along the central axis C is referred to as the mounting direction (sliding direction; X direction), the direction perpendicular to the mounting direction along the arrangement surface of the flange member 30 that closes the opening 2b formed in the bottom wall 2a of the fuel tank 2 described later is referred to as the intersecting direction (Y direction), and the normal direction to the arrangement surface is referred to as the opposing direction (Z direction).

[0025] <Fuel supply device> A fuel supply device 1 according to this embodiment is attached to a vehicle such as a motorcycle or a four-wheeled vehicle. The fuel supply device 1 is of a so-called bottom-mounted type. As shown in FIGS. 1 and 2, the fuel supply device 1 is inserted through an opening 2b formed in a bottom wall 2a of a fuel tank 2 and attached to the bottom wall 2a of the fuel tank 2. The fuel supply device 1 includes a fuel pump 10 disposed in the fuel tank 2, a cup (pump accommodating member) 20 that contains (accommodates) the fuel pump 10, a flange unit (flange member) 30 that supports the fuel pump 10 together with the cup 20 and is attached to the bottom wall 2a of the fuel tank 2, and a pressure regulator 45 attached inside the flange unit 30.

[0026] That is, the fuel supply device 1 according to this embodiment includes a flange member 30 that covers an opening 2b formed in a bottom wall 2a of the fuel tank 2, a fuel pump 10 that is placed horizontally near the bottom of the fuel tank 2 on the lower side in the Z direction so as to follow the placement surface 30a of the flange member 30 that is exposed inside the fuel tank 2, a cylindrical pump accommodating member 20 that accommodates the fuel pump 10 and is attached to the flange member 30, an inlet cover 50 connected to the pump accommodating member 20, a guide rail structure 100 that regulates the attachment direction in which the flange member 30 and the pump accommodating member 20 slide relative to each other in the X direction to be attached so that the attachment direction is along the placement surface 30a of the flange member 30, as will be described later, and a snap fit structure 200 that engages the flange member 30 and the pump accommodating member 20 with each other at a position that marks the end of the sliding in the attachment direction.

[0027] <Fuel pump> The fuel pump 10 is formed in a cylindrical shape with its central axis C aligned with the X direction. The fuel pump 10 has a motor section 11 disposed on the left side in FIGS. 1 and 2, and a pump section 12 disposed on the right side in FIGS. 1 and 2. The outer periphery of the fuel pump 10 is formed by a cylindrical housing case 13 made of, for example, metal. The housing case 13 supports the motor section 11 and the pump section 12 from the outside.

[0028] Here, the right side in the drawing means the right side in the X direction, that is, the fuel suction side in the direction along the arrangement surface 30a of the flange member 30 and the axial direction of the fuel pump 10. Similarly, the left side means the left side in the X direction, that is, the fuel discharge side in the direction along the arrangement surface 30a of the flange member 30 and the axial direction of the fuel pump 10. For example, a DC motor 11a with brushes (not shown) is used as the motor unit 11. The motor unit 11 has an output shaft 15 extending downward in the X direction at the center in the radial direction. The output shaft 15 extends from the left side of the motor unit 11 to the right side of the pump unit 12.

[0029] The pump section 12 uses a non-positive displacement pump having an impeller 16. In addition to the impeller 16, the pump section 12 also has an impeller case 18 formed to cover the entire impeller 16. The impeller 16 is a disc-shaped member made of, for example, resin. An insertion hole 16a is formed in the radial center of the impeller 16. The output shaft 15 of the DC motor 11a is inserted through the insertion hole 16a. The output shaft 15 is arranged so that its axial direction is in the X direction.

[0030] A plurality of blades (not shown) are formed on the outer periphery of the left and right surfaces of the impeller 16. The spaces between these blades penetrate the left and right surfaces of the impeller 16. Furthermore, a fuel flow path hole (not shown) that penetrates the left and right surfaces of the impeller 16 is formed between the insertion hole 16a of the impeller 16 and the blade (not shown). When the DC motor 11a is driven to rotate the impeller 16, fuel F passes through the fuel flow path hole (not shown) and is pressure-fed from the right side of the impeller 16 to the left side.

[0031] The impeller case 18 is formed to cover the left and right surfaces and outer periphery of the impeller 16. The lower end of the housing case 13 is crimped to the outer periphery of the right surface 18a of the impeller case 18. A fuel intake port 14 protruding toward the right is formed on the outer periphery of the right surface of the impeller case 18. Furthermore, a communication hole (not shown) penetrating the impeller case 18 in the X direction is formed, and the communication hole (not shown) is connected to the fuel intake port 14. As a result, fuel F is pumped into the pump section 12 via the fuel intake port 14 and the communication hole (not shown). On the right side of the fuel pump 10, an inlet cover 50 is attached to the cup 20. A discharge port 51 is formed on the left side of the housing case 13. The discharge port 51 communicates with a fuel flow path 71 formed in the regulator accommodating portion .

[0032] An outlet cover 17 is provided on the right side of the motor unit 11. The outlet cover 17 is made of, for example, resin. The outlet cover 17 is integrated with a flange member 30. The outlet cover 17 abuts against the fuel pump 10 housed in a cylindrical cup 20. The outlet cover 17 is integrated with a regulator housing portion 70 that stands upright from the placement surface 30a of the flange member 30, as will be described later. The outlet cover 17 is formed in a rectangular parallelepiped shape standing upright from the mounting surface 30a. The outlet cover 17 is configured to maintain the fuel pump 10 housed in the cup 20 when the flange member 30 and the cup 20 are engaged with each other by a snap-fit ​​structure 200, which will be described later. Note that the outlet cover 17 may have any other shape as long as it can maintain the fuel pump 10 housed in the cup 20. The outlet cover 17 is formed with a contact surface 17a that contacts the cup 20 and the fuel pump 10. The contact surface 17a is a flat surface that faces the cup 20 and the fuel pump 10 in the X direction. The contact surface 17a is formed to extend in the Z direction.

[0033] <Inlet cover> The inlet cover 50 is disposed further to the right of the right end of the cylindrical cup 20. The inlet cover 50 is attached to the cup 20 by surrounding the right end of the cup 20. Furthermore, a fuel intake port 14, through which fuel F flows into the fuel pump 10, is located inside and below the inlet cover 50. A check valve (not shown) that communicates with the fuel intake port 14 may be housed inside the inlet cover 50. The check valve is intended to prevent the fuel F that has flowed in through the fuel intake port 14 from flowing back.

[0034] A liquid level detector for detecting the liquid level of the fuel F stored in the fuel tank 2 may be attached to the inlet cover 50. A filter 14a is connected to the fuel intake port 14. The filter 14a is housed in the inlet cover 50. The filter 14a is located at the lowest part inside the fuel tank 2. The inlet cover 50 has an opening on the side opposite to the cup 20 in the X direction, allowing the fuel F in the fuel tank 2 to flow in.

[0035] <Cup (pump housing component)> The cup (pump accommodating member) 20 is formed, for example, from a highly durable resin into a cylindrical shape with a bottom and an opening facing the regulator accommodating portion 70 on the left side in the X direction. That is, the cup 20 is attached so as to accommodate the fuel pump 10 therein. The cup 20 is integrally formed with a cylindrical portion 22 that fits over the fuel pump 10 and an end wall 21 that is formed to close the opening at the right end of the cylindrical portion 22.

[0036] A plate-shaped locking piece 202 is formed on the cylindrical portion 22 of the cup 20 and extends toward the right in the X direction. The locking piece 202 is formed on the top of the cylindrical portion 22 so that its outer periphery extends in the axial direction. The locking piece 202 has a covering piece 220 that extends to the upper end of the regulator accommodating portion 70. The locking piece 202 will be described later. The cylindrical portion 22 of the cup 20 may be provided with a window portion 23 that opens on the outer circumferential surface. A plurality of window portions 23 may be formed. The cylindrical portion 22 of the cup 20 is formed with a guide rail structure 100 at its lower portion that is slidable relative to the flange member 30.

[0037] The lower end of the cup 20 is in contact with the flange member 30. A sliding portion 24 having a thickness and a sliding surface 20a, which is the lower end surface as described below, is formed on the lower side of the cup 20 in the Z direction. The sliding surface 20a is parallel to the arrangement surface 30a and extends in the X and Y directions. Furthermore, the dimension in the Y direction of the sliding portion 24 on which the sliding surface 20a is formed is greater than the dimension in the Y direction of the cylindrical portion 22 that houses the fuel pump 10, as described below.

[0038] As will be described later, the dimension in the X direction of slide surface 20a formed on slide portion 24 is smaller than the dimension in the X direction of tubular portion 22 that houses fuel pump 10. As will be described later, the dimension in the Z direction of slide portion 24, i.e., its thickness, is set to be strong enough to allow sliding of flange member 30 and cup 20 and to hold fuel pump 10, even when grooves serving as guide rail structure 100 are formed.

[0039] <Flange unit> The flange unit (flange member) 30 is made of, for example, a resin having excellent oil resistance. The flange unit 30 has a plate-shaped flange portion 32 that closes the opening 2b, a regulator accommodating portion 70 that is erected on the flange portion 32 facing inwardly toward the fuel tank 2, a cylindrical portion 34 that extends outwardly from the flange portion 32 toward the fuel tank 2, and a connector 33 that is spaced apart from the cylindrical portion 34 and extends outwardly from the flange portion 32 toward the fuel tank 2.

[0040] The flange portion 32 has a contour shape that corresponds to the contour shape of the opening 2b. In this embodiment, the flange portion 32 has a contour shape that is oval in plan view. The flange portion 32 has an arrangement surface 30a formed on the inside of the fuel tank 2. A regulator accommodating portion 70 is erected on the flange portion 32 at a position eccentric from the center in plan view. A circumferential groove 32a that protrudes upward is formed in the flange portion 32 at a position corresponding to the opening 2b of the fuel tank 2. Then, the flange unit 30 is inserted into the opening 2b from the outside of the fuel tank 2, and a fixing member (not shown) is brought into contact with the flange portion 32 of the flange unit 30 from below on the bottom wall 2a of the fuel tank 2, and this fixing member is fastened to the fuel tank 2 with bolts (not shown).

[0041] As a result, the part below flange portion 32 (tubular portion 34 and connector 33) is exposed to the outside of fuel tank 2. The part above flange portion 32 (regulator accommodating portion 70) is immersed in fuel F inside fuel tank 2. A seal member 32b made of rubber or the like is provided between flange portion 32 and bottom wall 2a of fuel tank 2, ensuring sealing between fuel supply device 1 and fuel tank 2.

[0042] The regulator accommodating portion 70 extends from the mounting surface 30a of the flange portion 32 and has a fuel flow path 71 formed therein. The fuel flow path 71 penetrates the flange portion 32 and communicates with the interior of the tubular portion 34. The fuel flow path 71 extends in the Z direction. The pressure regulator 45 is accommodated near the end portion 70a of the regulator accommodating portion 70. The pressure regulator 45 is accommodated in a holding recess 73 that communicates with the fuel flow path 71. The holding recess 73 is formed at the upper end portion of the fuel flow path 71 in the Z direction. The holding recess 73 has an opening 73a that opens into the fuel tank 2 at the end portion 70a of the regulator accommodating portion 70. The pressure regulator 45 is fixed to the holding recess 73 by a protrusion 221 formed in the Y direction of the opening 73a. The protrusion 221 protrudes upward in the Z direction from a position on the Y-direction side of the periphery of the opening 73a. The protrusion 221 is a thermally caulked portion.

[0043] <Pressure regulator> The pressure regulator 45 is used to maintain the fuel pressure of the fuel F flowing through the fuel flow path 71 at a certain value or less. The pressure regulator 45 is formed in a cylindrical shape. The outer peripheral surface of the pressure regulator 45 is fitted into the inner peripheral surface of the holding recess 73. The outer shape of the pressure regulator 45 substantially matches the inner shape of the holding recess 73. Therefore, the pressure regulator 45 is securely held in the holding recess 73. This prevents the pressure regulator 45 from rattling.

[0044] Furthermore, a fuel inlet (not shown) provided below the pressure regulator 45 communicates with the fuel flow path 71 . The fuel flow path 71 communicates with the discharge port 51 via a discharge flow path 71b that branches off in the X direction below the holding recess 73 and above the placement surface 30a in the Z direction. The pressure regulator 45 communicates with the discharge port 51 via the fuel flow path 71 and the discharge flow path 71b. An O-ring (not shown) is provided between the pressure regulator 45 and the bottom of the holding recess 73 to ensure sealing.

[0045] When the fuel pressure in the fuel flow path 71 exceeds a predetermined pressure, an on-off valve (not shown) provided in the pressure regulator 45 is pushed up by the fuel F filling the fuel flow path 71. Then, the fuel F flows into the pressure regulator 45 from below and is discharged into the fuel tank 2 from an opening 73a at the top of the pressure regulator 45. When the fuel F is discharged into the fuel tank 2, the fuel pressure in the fuel flow path 71 is reduced. When the fuel pressure in the fuel flow path 71 returns to a normal value, the discharge of the fuel F from the pressure regulator 45 is stopped. As a result, the fuel pressure in the fuel flow path 71 becomes equal to or lower than a certain value.

[0046] The lower end of the fuel flow passage 71 in the Z direction passes through the flange portion 32 and extends into the cylindrical portion 34. A discharge pipe 34a extending in the X direction along the flange portion 32 is connected to the lower end of the cylindrical portion 34 in the Z direction. The extending direction of the discharge pipe 34a coincides with the axial direction of the fuel pump 10. The fuel flow path 71 communicates with a second flow path 71c formed in the discharge pipe 34a from the cylindrical portion 34 at the lower end in the Z direction of the cylindrical portion 34. The outer end of the second flow path 71c communicates with the internal combustion engine 57 via the secondary filter 56. The cylindrical portion 34 and the discharge pipe 34a are integrally molded with the flange portion 32.

[0047] <filter> The primary filter 14a is disposed on the inlet cover 50 in a state where it is laid flat along the bottom wall 2a of the fuel tank 2. The primary filter 14a filters the fuel F pumped up by the fuel pump 10. The primary filter 14a is, for example, a suction filter. The primary filter 14a is formed into a bag shape by overlapping a pair of filter media (not shown) and welding their outer peripheries. The mesh diameter of the primary filter 14a is, for example, 70 μm.

[0048] On the other hand, the secondary filter 56 provided between the discharge pipe 34a and the internal combustion engine 57 is intended to further filter the fuel F filtered by the primary filter 14a with high accuracy before supplying it to the internal combustion engine 57. The mesh diameter of the secondary filter 56 is smaller than the mesh diameter of the primary filter 14a, and is, for example, 10 μm.

[0049] An external connector (not shown) connected to an external power source (not shown), a control device (not shown), etc. is fitted into a connector 33 provided on the lower side of the flange portion 32, i.e., a portion exposed to the outside of the fuel tank 2. The connector 33 is a cylindrical member that is rectangular when viewed from the X direction. The connector 33 has a connector fitting portion 33a that opens radially outward. A connector terminal 33b that provides electrical continuity between the inside and outside of the fuel tank 2 is provided inside the connector fitting portion 33a. The connector terminal 33b is a member made of a metal such as copper. The connector terminal 33b is electrically connected to the motor unit 11 and the liquid level detector via a harness 59 that is routed around the regulator housing portion 70 and the outer periphery of the fuel pump 10. This electrically connects the motor unit 11 and the liquid level detector to an external power source and a control device.

[0050] FIG. 3 is a perspective view showing the flange member 30 together with the guide rail structure in this embodiment. FIG. 4 is a perspective view showing the cup (pump accommodating member) 20 in this embodiment. FIG. 5 is a perspective view showing the guide rail structure in the cup (pump accommodating member) 20 in this embodiment. Note that FIG. 5 is a perspective view of the cup (pump accommodating member) 20 as viewed from the slide surface 20a side in FIG. 4. FIG. 6 is a cross-sectional view in the YZ direction showing the vertical guide rail structure 110 in the guide rail structure 100 in this embodiment. FIG. 6 is a cross-sectional view at a position corresponding to the guide surface 120a. FIG. 7 is a cross-sectional view in the YZ direction showing the vertical guide rail structure 110 in the guide rail structure 100 in this embodiment. FIG. 7 is a cross-sectional view at a position corresponding to the fixing surface 120c. Fig. 8 is a cross-sectional view in the XZ direction showing the vertical guide rail structure 110 in the guide rail structure 100 of this embodiment. Fig. 9 is a cross-sectional view in the XY direction showing the vertical guide rail structure 110 and the horizontal guide rail structure 150 in the guide rail structure 100 of this embodiment.

[0051] <Guide rail structure> The guide rail structure 100 is attached by sliding the flange member 30 and the cup 20 housing the fuel pump 10 relative to each other in the X direction. The guide rail structure 100 is arranged on the placement surface 30a of the flange member 30 and the slide surface 20a of the cup 20, which face each other and come into contact with each other.

[0052] As shown in Figures 3 to 9, the guide rail structure 100 has one vertical guide rail structure (first guide portion) 110 and two horizontal guide rail structures (second guide portions) 150. The one vertical guide rail structure 110 and the two horizontal guide rail structures 150 both extend in the X direction. The one vertical guide rail structure 110 and the two horizontal guide rail structures 150 are arranged parallel to each other.

[0053] Furthermore, the two horizontal guide rail structures 150 are arranged spaced apart on both outer sides in the Y direction of the single vertical guide rail structure 110. The horizontal guide rail structures 150 are capable of mutually restricting the positions in the Y direction when the flange member 30 and the cup 20 slide. Furthermore, the vertical guide rail structure 110 is capable of mutually restricting the positions in the X direction and the Y direction when the flange member 30 and the cup 20 slide. Here, "outside in the Y direction" means the direction from the vertical guide rail structure 110 toward the horizontal guide rail structures 150 on both sides along the Y direction.

[0054] In this embodiment, the vertical guide rail structure (first guide portion) 110 and the horizontal guide rail structure (second guide portion) 150 are formed on the flange member 30 and the cup 20, respectively. The vertical guide rail structure 110 and the horizontal guide rail structure 150 are arranged on the arrangement surface 30a of the flange member 30 and the slide surface 20a of the cup 20, which face each other and contact each other.

[0055] <Vertical guide rail structure> The vertical guide rail structure 110 regulates the positions of the flange member 30 and the pump accommodating member 20 at least in the X and Z directions. The vertical guide rail structure 110 has a vertical rail portion 111 formed on the placement surface 30a of the flange member 30 and a vertical guide portion 112 formed on the slide surface 20a.

[0056] <Vertical rail section> The vertical rail portion 111 is formed as a linear convex strip that protrudes upward in the Z direction from the arrangement surface 30a and extends in the X direction. The vertical rail portion 111 has a cross-sectional profile in the YZ direction that is approximately T-shaped. The vertical rail portion 111 has a base portion 113 that stands upright from the arrangement surface 30a, and protrusions 117 that extend in the Z direction from the base portion 113 and protrude on both sides in the Y direction from a Z-direction tip end 115 of the vertical rail portion 111. In other words, the Y-direction dimension of the tip end 115 of the vertical rail portion 111 is larger than the Y-direction dimension of the base portion 113. The Y-direction dimension of the tip end 115 of the vertical rail portion 111 increases toward both sides in the Y direction relative to the base portion 113.

[0057] The Y-direction dimension of the base 113 is formed to be the same from the placement surface 30a upward in the Z-direction to the lower end of the protrusion 117. The Y-direction dimension of the base 113 is formed to be approximately equal over the entire length of the vertical rail portion 111 in the X-direction. The top end surface 111a of the vertical rail portion 111 in the Z direction is formed flush with the XY plane, and the height of the vertical rail portion 111 standing from the placement surface 30a in the Z direction is approximately uniform.

[0058] The protrusion 117 is formed over the entire length of the vertical rail portion 111 in the X direction. The protrusion 117 is formed over the entire length of the vertical rail portion 111 in the X direction. The protrusion 117 is formed symmetrically with respect to the center of the vertical rail portion 111 in the Y direction. The protrusion 117 protrudes from the base 113 on both sides in the Y direction and is formed as a ridge with a rectangular cross section in the YZ direction. The two protrusions 117 are formed to have the same shape in the Y direction. The protrusion 117 has a lower surface 119 that protrudes from the base 113 in the Y direction and forms a contact surface 119 that comes into contact with a contact surface 120 of the vertical guide portion 112, which will be described later. The contact surface 119 is formed to be flat over the entire length in the X and Y directions. The contact surface 119 is formed to be parallel to the placement surface 30a over the entire length in the X and Y directions.

[0059] <Vertical guide section> Two vertical guide portions 112 are formed parallel to the vertical rail portion 111, on both sides of the vertical rail portion 111 in the Y direction. Each vertical guide portion 112 is formed as a linear convex strip that protrudes downward in the Z direction from the slide portion 24 and extends in the X direction. The lower ends (tips) of both vertical guide portions 112 in the Z direction coincide with the slide surface 20a, and both are formed to be flush. The two vertical guide portions 112 are spaced apart from each other in the Y direction and are formed linearly extending in the X direction with the vertical rail portion 111 between them. In other words, the two vertical guide portions 112 are formed so that the space between them in the Y direction is groove-shaped, opening as an opening 116 on the slide surface 20a. The two vertical guide portions 112 are formed symmetrically in the Y direction with respect to the center of the vertical rail portion 111 in the Y direction.

[0060] The groove between the two vertical guide portions 112 also opens to a side end surface 24a that is close to the regulator accommodating portion 70 in the X direction of the sliding portion 24. The groove between the two vertical guide portions 112 is closed at a side end surface 24b that is away from the regulator accommodating portion 70 in the X direction of the sliding portion 24. The groove between the two vertical guide portions 112 opens to the sliding surface 20a of the sliding portion 24 over almost the entire length in the Y direction.

[0061] The top and bottom surfaces 112a of the groove between the two vertical guide portions 112 are flat surfaces parallel to the slide surface 20a and the placement surface 30a. The two vertical guide portions 112 have protrusions 118 formed at their downward Z-direction tips that protrude in directions approaching each other. That is, in each vertical guide portion 112, the protrusions 118 protrude in the Y direction toward the base 113 of the vertical rail portion 111. The cross-sectional contour of each of the two vertical guide portions 112 in the YZ direction is formed to be approximately L-shaped. Similarly, the cross-sectional shape of the vertical guide portion 112 opening at the side end face 24a corresponds to a shape that follows the periphery of the contour shape of the vertical rail portion 111 in the same direction.

[0062] The groove formed by the two vertical guide portions 112 has a top / bottom surface 112a facing the top end surface 111a and furthest upward in the Z direction from the slide surface 20a, side surfaces 114 hanging downward in the Z direction from both ends of the top / bottom surface 112a in the Y direction, an opening 116 formed in the slide surface 20a at the lower end of the side surface 114 in the Z direction, and protrusions 118 formed on both sides in the Y direction so as to narrow the groove width of the opening 116.

[0063] The protrusions 118 are formed over the entire length of the vertical guide portion 112 in the X direction. The protrusions 118 protrude from the side surfaces 114 facing each other in the Y direction so as to sandwich both sides of the opening 116, and the upper surfaces protruding from the side surfaces 114 in the Y direction form contact surfaces 120 that come into contact with contact surfaces 119 of the vertical rail portion 111. The Z-direction distance between the contact surfaces 120 and the slide surface 20a varies in the X direction, as will be described later. Accordingly, the Z-direction height dimension from the top / bottom surface 112a to the contact surfaces 120 varies in the X direction by the same amount as the Z-direction height dimension of the side surfaces 114.

[0064] <Contact surface> The contact surface 120 is formed over the entire length of the vertical guide portion 112 in the X direction. 8, the contact surface 120 has three regions in the X direction. Specifically, in the X direction, from the side end surface 24a to the side end surface 24b of the contact surface 120, there are a guide surface 120a, an inclined surface 120b as an inclined portion, and a fixed surface 120c as a fixed portion.

[0065] The guide surface 120a is formed on the contact surface 120 at a position close to the side end surface 24a where the groove opens in the X direction. The guide surface 120a is formed at a position where the flange member 30 and the cup 20 first come into contact when the flange member 30 and the cup 20 slide, that is, at the tip of the vertical guide portion 112 in the installation direction (X direction). The guide surface 120a is parallel to the slide surface 20a and the arrangement surface 30a. The distance in the Z direction between the guide surface 120a and the slide surface 20a is smaller than the distance in the Z direction between the arrangement surface 30a and the contact surface 119. In other words, the Z-direction thickness dimension of the protrusion 118 corresponding to the guide surface 120a is smaller than the Z-direction height dimension of the base 113.

[0066] The inclined surface (inclined portion) 120b is formed on the contact surface 120 at a position between the side end surfaces 24a and 24b in the X direction and spaced apart from the side end surfaces 24a and 24b in the X direction. The inclined surface 120b is inclined in the X direction from the side end surfaces 24a to 24b so as to move away from the slide surface 20a. In other words, the inclined surface 120b is inclined so as to approach the top / bottom surface 112a in the X direction as it moves from the side end surfaces 24a to 24b. The inclined surface 120b is formed contiguous with the guide surface 120a and above the protrusion 118 in the Z direction. The inclined surface 120b is formed at a position where the flange member 30 and the cup 20 come into contact with each other following the guide surface 120a when the flange member 30 and the cup 20 slide, i.e., midway in the installation direction (X direction) of the vertical guide portion 112. Although the inclined surface (inclined portion) 120b can be formed as a draft when molding the flange member 30, it is preferable to form it intentionally in order to accurately regulate the position.

[0067] The Z-direction distance between inclined surface 120b and sliding surface 20a is equal to the Z-direction distance between guide surface 120a and sliding surface 20a at a position adjacent to guide surface 120a. In other words, the Z-direction thickness dimension of protrusion 118 corresponding to inclined surface 120b is smaller than the Z-direction height dimension of base 113. The Z-direction distance between inclined surface 120b and sliding surface 20a is equal to the Z-direction distance between fixing surface 120c (described later) and sliding surface 20a at a position adjacent to fixing surface 120c (described later). In other words, the Z-direction thickness dimension of protrusion 118 corresponding to inclined surface 120b is approximately equal to the Z-direction height dimension of base 113.

[0068] The fixing surface 120c is formed at a position on the contact surface 120 close to the side end surface 24b where the groove is closed in the X direction. The fixing surface 120c is formed at the position where the flange member 30 and the cup 20 finally come into contact when the flange member 30 and the cup 20 slide, that is, at the base end of the vertical guide portion 112 in the installation direction (X direction). The fixing surface 120c is parallel to the sliding surface 20a and the arrangement surface 30a. The distance in the Z direction between the fixing surface 120c and the sliding surface 20a is approximately equal to the distance in the Z direction between the arrangement surface 30a and the contact surface 119. In other words, the Z direction thickness dimension of the protrusion 118 corresponding to the fixing surface 120c is approximately equal to the Z direction height dimension of the base portion 113.

[0069] <Horizontal guide rail structure> The horizontal guide rail structure 150 regulates the positions of the flange member 30 and the pump accommodating member 20 at least in the X direction. The horizontal guide rail structure 150 is formed linearly extending in the X direction. Two horizontal guide rail structures 150 are formed on both sides of the vertical guide rail structure 110 in the Y direction. The horizontal guide rail structures 150 are formed spaced apart from the vertical guide rail structure 110 in the Y direction. The two horizontal guide rail structures 150 are formed symmetrically in the Y direction with respect to the vertical guide rail structure 110.

[0070] One of the lateral guide rail structures 150 has a lateral rail portion 151 formed on the placement surface 30a of the flange member 30, a lateral inner guide portion (lateral guide portion) 152 formed on the slide surface 20a, and a lateral outer guide portion (lateral guide portion) 153 formed on the slide surface 20a. The horizontal guide rail structure 150 is arranged in the Y direction with a distance from the vertical guide rail structure 110 in the order of the horizontal inner guide portion 152, the horizontal rail portion 151, and the horizontal outer guide portion 153.

[0071] <Side rail section> The lateral rail portion 151 is formed as a linear convex strip that protrudes upward in the Z direction from the placement surface 30a and extends in the X direction. The lateral rail portion 151 has a cross-sectional profile in the YZ direction that is substantially rectangular. The horizontal rail portion 151 is formed so that the Y-direction dimension is uniform over the entire length in the X-direction. The horizontal rail portion 151 is formed so that the Z-direction dimension is uniform over the entire length in the X-direction.

[0072] The horizontal rail portion 151 is erected from the arrangement surface 30a, and the surface of the Y-direction side surface facing the vertical rail portion 111 serves as a horizontal contact surface (contact surface) 155. The horizontal contact surface 155 is a flat surface extending in the XZ plane. The horizontal contact surface 155 is formed over the entire length of the horizontal rail portion 151 in the X direction. In the two horizontal guide rail structures 150 located on both sides of the vertical guide rail structure 110 in the Y direction, the horizontal contact surfaces 155 face each other in the Y direction.

[0073] The Z-direction tip of the lateral rail portion 151 is formed as a top end surface 151a parallel to the placement surface 30a over the entire length in the X direction. The Z-direction height of the lateral rail portion 151, that is, the height from the placement surface 30a to the top end surface 151a, is uniform over the entire length in the X direction. The Z-direction height of the lateral rail portion 151 can be the same as the Z-direction height from the slide surface 20a to a top bottom surface 152a (described later).

[0074] <Side guide> The lateral inner guide portion 152 and the lateral outer guide portion 153 are formed on both sides of the lateral rail portion 151 in the Y direction, parallel to the lateral rail portion 151. The lateral inner guide portion 152 and the lateral outer guide portion 153 are both formed as linear convex strips that protrude downward in the Z direction from the slide portion 24 and extend in the X direction. The lateral inner guide portion 152 and the lateral outer guide portion 153 are both formed so that their lower ends in the Z direction coincide with the slide surface 20a, and are flush with each other.

[0075] The inner lateral guide portion 152 and the outer lateral guide portion 153 are spaced apart from each other in the Y direction and are both formed in linear shapes extending in the X direction so as to sandwich the vertical rail portion 111. In other words, the inner lateral guide portion 152 and the outer lateral guide portion 153 are formed so that the space between them in the Y direction forms a groove shape that opens as an opening 156 on the slide surface 20a. The two vertical guide portions 112 are formed symmetrically to each other in the Y direction with respect to the center of the vertical rail portion 111 in the Y direction.

[0076] The groove between the lateral inner guide portion 152 and the lateral outer guide portion 153 also opens to a side end face 24a of the sliding portion 24 that is close to the regulator accommodating portion 70 in the X direction. The groove between the lateral inner guide portion 152 and the lateral outer guide portion 153 is closed at a side end face 24b that is away from the regulator accommodating portion 70 in the X direction of the sliding portion 24. The groove between the lateral inner guide portion 152 and the lateral outer guide portion 153 opens to the sliding surface 20a of the sliding portion 24 over almost the entire length in the Y direction. The top and bottom surfaces 152a of the groove between the inner lateral guide portion 152 and the outer lateral guide portion 153 are flat surfaces parallel to the slide surface 20a and the placement surface 30a.

[0077] The lateral outer guide portion 153 is formed so that the cross-sectional contour in the YZ direction is substantially rectangular. The outer lateral guide portion 153 is formed so that the Y dimension is uniform over the entire length in the X direction. The outer lateral guide portion 153 is formed so that the Z dimension is uniform over the entire length in the X direction.

[0078] The lateral inner guide portion 152 is formed so that the cross-sectional contour in the YZ direction is substantially rectangular. The lateral inner guide portion 152 is formed so that the Z direction dimension is uniform over the entire length in the X direction.

[0079] The groove formed by the lateral inner guide portion 152 and the lateral outer guide portion 153 has a top-bottom surface 152a facing the top end surface 151a and furthest upward in the Z direction from the slide surface 20a, a side surface 154 of the lateral outer guide portion 153 which is a side surface that hangs down in the Z direction from both ends of the top-bottom surface 152a in the Y direction to the opening 156, and a lateral contact surface (contact surface) 158 of the lateral inner guide portion 152 which is a side surface that hangs down in the Z direction from both ends of the Y direction of the top-bottom surface 152a to the opening 156.

[0080] <Lateral contact surface> The lateral contact surface (contact surface) 158 has a flat surface extending along the XZ plane. The lateral contact surface 158 is formed over the entire length of the lateral inner guide portion 152 in the X direction. 9, the lateral contact surface 158 has three regions in the X direction. Specifically, the lateral contact surface 158 has, from the side end surface 24a toward the side end surface 24b in the X direction, a lateral guide surface 158a, a lateral inclined surface 158b as an inclined portion, and a lateral fixing surface 158c as a fixing portion.

[0081] The lateral guide surface 158a is formed on the lateral contact surface 158 at a position close to the side end surface 24a where the groove opens in the X direction. The lateral guide surface 158a is formed at a position where the flange member 30 and the cup 20 first come into contact when sliding between the flange member 30 and the cup 20, i.e., at the leading end side of the lateral inner guide portion 152 in the installation direction (X direction). The lateral guide surface 158a is along an XY plane perpendicular to the slide surface 20a and the placement surface 30a. The Y-direction distance between the lateral guide surface 158a and the vertical guide rail structure 110 is constant over the entire length of the lateral guide surface 158a in the X direction. In other words, the Y-direction thickness dimension of the lateral inner guide portion 152 corresponding to the lateral guide surface 158a is constant over the entire length of the lateral guide surface 158a in the X direction.

[0082] The lateral inclined surface (inclined portion) 158b is formed on the lateral contact surface 158 at a position between the side end surface 24a and the side end surface 24b in the X direction and spaced apart from the side end surface 24a and the side end surface 24b in the X direction. The lateral inclined surface 158b is inclined so as to move away from the vertical guide rail structure 110 in the Y direction as it moves from the side end surface 24a to the side end surface 24b in the X direction. In other words, the lateral inclined surface 158b is inclined so as to move closer to the lateral outer guide portion 153 in the Y direction as it moves from the side end surface 24a to the side end surface 24b. The lateral inclined surface 158b is continuous with the lateral guide surface 158a and is formed on the outer side of the lateral inner guide portion 152 in the Y direction. The lateral inclined surface 158b is formed at a position where the flange member 30 and the cup 20 come into contact following the lateral guide surface 158a when the flange member 30 and the cup 20 slide, that is, in the middle of the installation direction (X direction) of the lateral inner guide portion 152.

[0083] The Y-direction distance between the lateral inclined surface 158b and the vertical guide rail structure 110 is equal to the Y-direction distance between the lateral guide surface 158a and the vertical guide rail structure 110 at a position adjacent to the lateral guide surface 158a. In other words, the Y-direction thickness dimension of the lateral inner guide portion 152 corresponding to the lateral inclined surface 158b is equal to the Y-direction thickness dimension of the lateral inner guide portion 152 corresponding to the lateral guide surface 158a at a position adjacent to the lateral guide surface 158a. The Y-direction distance between the lateral inclined surface 158b and the vertical guide rail structure 110 is equal to the Y-direction distance between the lateral fixing surface 158c and the vertical guide rail structure 110 at a position adjacent to a lateral fixing surface 158c (described later). In other words, the Y-direction thickness dimension of the lateral inner guide portion 152 corresponding to the lateral inclined surface 158b is approximately equal to the Y-direction thickness dimension of the lateral inner guide portion 152 corresponding to the lateral fixing surface 158c.

[0084] The lateral fixing surface 158c is formed at a position of the lateral contact surface 158 close to the side end surface 24b where the groove is closed in the X direction. The lateral fixing surface 158c is formed at the sliding end position where the flange member 30 and the cup 20 last come into contact when sliding between the flange member 30 and the cup 20, that is, at the base end of the lateral inner guide portion 152 in the installation direction (X direction). The lateral fixing surface 158c is along an XY plane perpendicular to the slide surface 20a and the placement surface 30a. The Y-direction distance between the lateral fixing surface 158c and the vertical guide rail structure 110 is constant over the entire length of the lateral fixing surface 158c in the X direction. The Y-direction distance between the lateral fixing surface 158c and the vertical guide rail structure 110 is greater than the Y-direction distance between the lateral guide surface 158a and the vertical guide rail structure 110. That is, the Y-direction thickness dimension of the lateral inner guide portion 152 corresponding to the lateral fixing surface 158c is constant over the entire length of the lateral fixing surface 158c in the X-direction. The Y-direction thickness dimension of the lateral inner guide portion 152 corresponding to the lateral fixing surface 158c is greater than the Y-direction thickness dimension of the lateral inner guide portion 152 corresponding to the lateral guide surface 158a.

[0085] Here, the two lateral inner guide portions 152 located on both outer sides in the Y direction of the vertical guide rail structure 110 each have an inclined lateral inclined surface 158b so that the lateral fixing surfaces 158c are positioned further outward in the Y direction than the lateral guide surfaces 158a. In other words, in the two lateral guide rail structures 150, the separation distance between the two lateral inclined surfaces 158b in the Y direction increases from the side end surface 24a toward the side end surface 24b in the X direction. Furthermore, in the two lateral guide rail structures 150, the separation distance between the lateral fixing surfaces 158c in the Y direction is greater than the separation distance between the lateral guide surfaces 158a in the Y direction. As a result, the lateral contact surface 155 in contact with the lateral contact surface 158 is pressed outward in the Y direction at the final stage of sliding between the flange member 30 and the cup 20. In other words, the lateral inclined surface 158b increases the contact pressure in the Y direction between the lateral inner guide portion 152 and the lateral rail portion 151.

[0086] The horizontal inclined surface 158b and the inclined surface 120b are aligned in the X direction. That is, the boundary between the horizontal guide surface 158a and the horizontal inclined surface 158b is aligned in the X direction with the boundary between the guide surface 120a and the inclined surface 120b. Similarly, the boundary between the horizontal fixed surface 158c and the horizontal inclined surface 158b is aligned in the X direction with the boundary between the fixed surface 120c and the inclined surface 120b.

[0087] The snap-fit ​​structure 200 locks the flange member 30 and the pump housing member 20 together at a position that is the sliding end in the X direction (mounting direction), thereby restricting their positions. A plurality of snap-fit ​​structures 200 can be provided spaced apart in the circumferential direction of the cylindrical portion 22. In this embodiment, the snap-fit ​​structures 200 are provided in three locations.

[0088] The snap-fit ​​structure 200 is provided at two locations: the top of the regulator accommodating portion 70, and near the mounting surface 30a on both sides of the pump accommodating member 20 in the Y direction. The snap-fit ​​structure 200 has three locking pieces 202, 212, and 212 and corresponding locking protrusions 203, 213, and 213. The locking piece 202, the locking piece 212, and the locking piece 212 all protrude from the pump accommodating member 20 in the X direction toward the regulator accommodating portion . The locking piece 202 is formed on the top of the regulator accommodating portion 70. The locking pieces 212 and 212 are provided on both sides in the Y direction of the pump accommodating member 20 near the placement surface 30a.

[0089] The locking piece 202 extends in the X direction so as to bridge over the top of the regulator accommodating portion 70. The locking piece 202 is connected to the Z-direction uppermost portion, i.e., the top, of the tubular portion 22, which is cylindrical around a central axis C along the X direction. The locking piece 202 has a predetermined dimension in the Y direction. The locking piece 202 is formed in a curved surface that is continuous with the cylindrical surface of the tubular portion 22, and an opening 201 is formed in the locking piece 202. The opening 201 has a substantially rectangular outline. The opening 201 is located approximately in the center of the locking piece 202 in the Y direction. The opening 201 opens upward and downward in the Z direction and penetrates the locking piece 202 in the Z direction. When viewed in the Z direction, the locking piece 202 and the opening 201 are located at a position where the vertical guide rail structure 110 is extended in the X direction.

[0090] The locking protrusion 203 is formed on the top of the regulator accommodating portion 70. The locking protrusion 203 is formed on the top of the outlet cover 17 in the Z direction. The locking protrusion 203 is formed in a position farther away from the pump accommodating member 20 in the X direction than the abutment surface 17a. The locking protrusion 203 is formed in a position closer to the pump accommodating member 20 in the X direction than the opening 73a. The locking protrusion 203 protrudes upward in the Z direction and is inserted into the opening 201 to lock the locking piece 202. The locking protrusion 203 is located at a position where the vertical guide rail structure 110 is extended in the X direction as viewed in the Z direction. The contour shape of the locking protrusion 203 as viewed in the Z direction is the same as the shape of the opening 201. The locking protrusion 203 has an inclined surface formed at a position away from the regulator accommodating portion 70 in the X direction, and when the opening 201 is locked, the locking operation of the locking piece 202 is facilitated.

[0091] The locking piece 202 has a covering piece 220 that extends further in the X direction from the opening 201 to a position above the opening 73a. The covering piece 220 overlaps the opening 73a when viewed in the Z direction. There is a gap between the covering piece 220 and the edge of the opening 73a. In other words, the covering piece 220 does not contact the entire periphery of the opening 73a; it simply overlaps and does not block the opening 73a. The covering piece 220 can come into contact with a protrusion 221 formed on a side position of the opening 73a in the Y direction.

[0092] Covering piece 220 does not block opening 73a, does not obstruct the fuel F being discharged from pressure regulator 45 into fuel tank 2, and at the same time, can prevent foreign matter from entering regulator accommodating portion 70 from inside fuel tank 2. In this way, covering piece 220, which serves as a foreign matter entry prevention member, is integrated with locking piece 202, thereby reducing the number of parts.

[0093] The locking pieces 212 are formed on both sides of the tubular portion 22 in the Y direction in a plan view. The locking pieces 212 extend in the X direction from the side end surfaces 24a of the sliding portion 24. The locking pieces 212 are formed in the shape of flat plates with a predetermined thickness in the Z direction. The locking pieces 212 have a predetermined dimension in the Y direction. Openings 211 of the same shape are formed in each of the locking pieces 212. The openings 211 have a substantially rectangular outline. The openings 211 are located approximately in the center of the locking pieces 212 in the Y direction. The openings 211 open upward and downward in the Z direction and penetrate the locking pieces 212 in the Z direction. The locking pieces 212 and the openings 211 are both located at positions where the lateral guide rail structure 150 is extended in the X direction when viewed in the Z direction.

[0094] Each of the locking protrusions 213 extends upward in the Z direction from the arrangement surface 30a and is inserted into the opening 211 to lock the locking piece 212. The outline shape of the locking protrusion 213 as viewed in the Z direction is the same as the shape of the opening 211. The locking protrusion 213 has an inclined surface formed at a position away from the regulator accommodating portion 70 in the X direction, which facilitates the locking action of the locking piece 212 when the opening 211 is locked. The locking protrusion 213 is arranged at the X-direction end of the lateral rail portion 151 of the lateral guide rail structure 150. The locking protrusion 213 has an inclined surface formed at a position away from the regulator accommodating portion 70 in the X direction, which facilitates the locking action of the locking piece 212 when the opening 211 is locked.

[0095] 1 to 3 reaches the fixing surface 120c, the X-direction length of the locking piece 212 is set so that when the flange member 30 and the cup 20 slide, the sliding starting end on the right side of the vertical rail portion 111 shown in FIGS. 1 to 3 reaches the inclined surface 120b, and at the same time, the X-direction tip of the locking piece 212 reaches the locking protrusion 203. Furthermore, the X-direction position of the opening 211 in the locking piece 212 is set so that when the flange member 30 and the cup 20 slide, the sliding starting end on the right side of the vertical rail portion 111 shown in FIGS. 1 to 3 reaches the fixing surface 120c, and then the opening 211 and the locking protrusion 213 lock with each other.

[0096] Similarly, the X-direction length of the locking piece 202 and the X-direction position of the opening 201 in the locking piece 202 are set to correspond to the position of the sliding start end of the vertical rail portion 111 and the inclined surface 120b when the flange member 30 and the cup 20 slide. Similarly, the X-direction length of locking piece 212 and the X-direction position of opening 211 in locking piece 212 correspond to the sliding start end of lateral rail portion 151 and the X-direction position of lateral inclined surface 158b when flange member 30 slides on cup 20. Furthermore, the X-direction length of locking piece 202 and the X-direction position of opening 201 in locking piece 202 correspond to the sliding start end of lateral rail portion 151 and the X-direction position of lateral inclined surface 158b.

[0097] That is, the positions in the X direction are set so that the openings 201, 211 and the locking protrusions 203, 213 are locked together when the positions of the flange member 30 and the cup 20 are set by the contact surface 120 and the lateral contact surface 158.

[0098] Next, the guide rail structure 100 for assembling the flange member 30 and the cup 20 by sliding them will be described.

[0099] <Guide rail structure when sliding> To assemble the flange member 30 and the cup 20, the fuel pump 10 is housed in the cup 20, and then the guide rail structure 100 is assembled. First, the position where the slide surface 20a abuts against the placement surface 30a is set so that the vertical rail portion 111 and the vertical guide portion 112 are aligned on the same straight line. In this state, the cup 20 and the regulator accommodating portion 70 of the flange member 30 are moved in the X direction so as to approach each other.

[0100] At this time, the slide starting end, which is the right side of vertical rail portion 111 shown in FIGS. 1 to 3, is inserted into the groove formed by two vertical guide portions 112, 112 from the opening in side end face 24a. At the same time, protrusions 117 on both sides in the Y direction are inserted into the groove opening in side end face 24a, which serves as the slide starting end, so that they are both above protrusion 118. Here, immediately after insertion, contact surface 120 of protrusion 117 is guide surface 120a, so that contact surface 119 does not come into contact with contact surface 120, or there is a margin for movement between contact surface 119 and contact surface 120 in the Z direction, as shown in FIG.

[0101] 1 to 3 is inserted from the opening in the side end surface 24a into the groove formed by the lateral inner guide portion 152 and the lateral outer guide portion 153. Here, immediately after insertion, the lateral contact surface 158 of the lateral inner guide portion 152 is the lateral guide surface 158a, and therefore, as shown in FIG. 6, the lateral contact surface 155 and the lateral contact surface 158 do not come into contact with each other, or there is a margin between the lateral contact surface 155 and the lateral contact surface 158 that allows them to move in the Y direction.

[0102] Furthermore, cup 20 and regulator accommodating portion 70 are slid in the X direction so that they approach each other. Here, the sliding starting end on the right side of vertical rail portion 111 abuts against inclined surface 120b. Contact surface 119 is at a constant distance from placement surface 30a in the Z direction. Furthermore, the thickness of protrusion 118 in the Z direction increases along the slope of inclined surface 120b. Therefore, as the sliding movement progresses, protrusion 117 presses protrusion 118 downward in the Z direction. As a result, vertical guide portion 112 is pressed downward in the Z direction.

[0103] At the same time, when the cup 20 and the flange member 30 are slid, the lateral contact surface 155 abuts against the lateral inclined surface 158b at the sliding start end, which is the right side of the lateral rail portion 151 shown in FIGS. 1 to 3 . Here, the lateral contact surface 155 of the lateral rail portion 151 is at a constant distance in the Y direction from the vertical guide rail structure 110. Furthermore, the distance between the two lateral contact surfaces 155 in the Y direction is constant for the two lateral rail portions 151. Furthermore, the thickness of the lateral inner guide portion 152 increases outward in the Y direction along the inclination of the lateral inclined surface 158b. That is, for the two lateral inner guide portions 152, the distance between the two lateral inclined surfaces 158b in the Y direction increases toward the sliding end. Therefore, as the cup 20 and the flange member 30 slide, the lateral contact surface 155 is pressed outward in the Y direction by the lateral inclined surface 158b. Therefore, the two lateral rail portions 151 are both pressed outward in the Y direction by the two lateral inner guide portions 152. The two horizontal inner guide portions 152 are both pressed inward in the Y direction by the two horizontal rail portions 151.

[0104] Furthermore, cup 20 and regulator accommodating portion 70 are slid in the X direction so that they approach each other. As a result, the slide starting end, which is the right side of vertical rail portion 111, approaches the slide terminal end of vertical guide portion 112. Contact surface 119 abuts against fixing surface 120c, and protrusion 118 is pressed downward in the Z direction by protrusion 117. At the sliding end, the protrusion 118 is sandwiched between the contact surface 119 of the protrusion 117 and the arrangement surface 30a. The protrusion 117 is also sandwiched between the top and bottom surfaces 112a and the fixing surface 120c. As a result, the protrusions 117 and 118 are fixed in a press-fit state. That is, protrusion 118 is fixed in a state where it is restricted to a position in the Z direction defined by arrangement surface 30a and contact surface 120c. That is, the Z direction positions of cup 20 and flange member 30 are defined with slide surface 20a in contact with arrangement surface 30a.

[0105] At the same time, when the cup 20 and the flange member 30 are slid, the sliding start end of the lateral rail portion 151 approaches the sliding end end of the lateral inner guide portion 152. The lateral contact surface 155 abuts against the lateral fixing surface 158c, and the lateral rail portion 151 is pressed outward in the Y direction by the lateral inner guide portion 152. The two lateral rail portions 151 are pressed outward in opposite directions in the Y direction by the lateral inner guide portions 152 with which they abut. Here, in the two lateral rail portions 151, the distance between the two lateral contact surfaces 155 in the Y direction is constant. In the two lateral inner guide portions 152, the distance between the two lateral fixing surfaces 158c in the Y direction increases toward the sliding end ends. Therefore, the positions of the two lateral rail portions 151 and the two lateral inner guide portions 152 are restricted to a state determined by the Y direction position determined between the two lateral fixing surfaces 158c and the Y direction position determined between the two lateral contact surfaces 155. The two lateral inner guide portions 152 are both pressed inward in the Y direction by the two lateral rail portions 151, and their Y direction positions are fixed in a press-fit state.

[0106] Furthermore, when the sliding start end of vertical rail portion 111 abuts against inclined surface 120b while sliding cup 20 and flange member 30, the sliding start end of horizontal rail portion 151 abuts against horizontal inclined surface 158b. Furthermore, when the sliding start end of vertical rail portion 111 abuts against fixed surface 120c, the sliding start end of horizontal rail portion 151 abuts against horizontal fixed surface 158c. In other words, the positions of inclined surface 120b and horizontal inclined surface 158b during sliding correspond to each other in the X direction. In this way, the guide rail structure 100 having the vertical rail portion 111 with a T-shaped cross section can maintain balance between the flange member 30 and the cup 20.

[0107] Next, a snap-fit ​​structure 200 for assembling the flange member 30 and the cup 20 by sliding them together will be described.

[0108] <Snap-fit ​​structure when sliding> When the cup 20 and the flange member 30 are slid, the guide rail structure 100 restricts the sliding of the cup 20 and the flange member 30 relative to each other in the X direction. At this time, the locking pieces 202, 212, 212 ride up onto the locking protrusions 203, 213, 213 in accordance with the sliding, and then the locking protrusions 203, 213, 213 are inserted into the openings 201, 211, 211.

[0109] During the sliding of the cup 20 and the flange member 30, when the sliding start end of the vertical rail portion 111 abuts against the inclined surface 120b and the sliding start end of the horizontal rail portion 151 reaches the horizontal inclined surface 158b, the locking pieces 212, 212 abut against the locking protrusions 213, 213. In other words, the positions of the locking piece 212 and the locking protrusion 213 during sliding correspond to the inclined surface 120b and the horizontal inclined surface 158b in the X direction. When the pressing force applied to the sliding start end of the vertical rail portion 111 by the inclined surface 120b increases and the pressing force applied to the sliding start end of the horizontal rail portion 151 by the horizontal inclined surface 158b increases, the abutment between the locking piece 212 and the locking protrusion 213 is maintained.

[0110] When the sliding start end of vertical rail portion 111 is pressed by fixing surface 120c and the sliding start end of horizontal rail portion 151 is pressed by horizontal fixing surface 158c, locking protrusions 203, 213, 213 are inserted into openings 201, 211, 211. As a result, cup 20 and flange member 30 are fixed by snap-fit ​​structure 200 that is locked to each other. In addition, before locking piece 202 starts to come into contact with locking protrusion 203 when locking piece 212 and locking protrusion 213 slide, covering piece 220 comes into contact with locking protrusion 203. Covering piece 220 has a positional relationship with opening 73a, regardless of whether it is locked by snap-fit ​​structure 200.

[0111] <Fuel supply system operation> Next, the operation of the fuel supply device 1 will be described. First, the fuel supply device 1 is attached to the fuel tank 2, and the fuel tank 2 is filled with fuel F. Then, the fuel supply device 1 is immersed in the fuel F. The fuel F flows into the flange unit 30 mainly through the gap between the opening 73a formed in the regulator accommodating portion 70 of the flange unit 30 and the covering piece 220, and is stored in the holding recess 73 and the like.

[0112] In this state, when the motor unit 11 is driven to operate the fuel pump 10, the fuel F is pumped up to the fuel intake port 14 of the fuel pump 10 via the primary filter 14a. The fuel F pumped up into the fuel pump 10 is pumped toward the discharge port 51 by the rotation of the impeller 16 . The fuel F pressure-fed toward the discharge port 51 is sent to the fuel flow path 71 via the check valve and the discharge flow path 71b. Thereafter, the fuel F passes through the cylindrical portion 34 and is discharged from the discharge pipe 34a. The fuel F discharged from the discharge pipe 34a passes through the secondary filter 56 and is pressure-fed to the internal combustion engine 57.

[0113] When the fuel pressure in the fuel flow path 71 becomes higher than a predetermined pressure, the pressure regulator 45 discharges the fuel F filling the fuel flow path 71 into the fuel tank 2. This reduces the fuel pressure in the fuel flow path 71, and the fuel pressure in the fuel flow path 71 becomes equal to or lower than a certain value. Therefore, the fuel F passes through the fuel flow path 71 and the cylindrical portion 34, and is discharged from the discharge pipe 34a, with the fuel pressure maintained at or lower than the certain value. In other words, the pressure regulator 45 maintains the pressure of the fuel F discharged from the fuel tank 2 via the fuel supply device 1 at or lower than a certain value.

[0114] According to the above-described embodiment, the flange member 30 and the cup 20 can be formed as separate members and molded separately. This eliminates the need to simultaneously mold the tubular portion 34, which has the regulator accommodating portion 70 and the fuel flow path 71, each having an axis in the Z direction, and the cup 20, which has an axis in the X direction. This allows for a simpler mold structure, increases the degree of freedom in the placement of the flange mold relative to the E-pin (ejector pin), and suppresses deformation when the flange is released from the mold.

[0115] There is no need to simultaneously mold the regulator housing portion 70 and the cylindrical portion 34 having the fuel flow path 71, each having an axis in the Z direction, and the cup 20, each having an axis in the X direction, and this simplifies the structure of each part. Because the cup 20 is circular, the mold structure for the cup 20 is also cylindrical, which can simplify the mold structure.

[0116] Using the guide rail structure 100 and the snap fit structure 200, the flange member 30 and the cup 20 are fixed by fitting the vertical rail portion 111 with the vertical guide portion 112, and the horizontal rail portion 151 with the horizontal guide portions 152, 153, thereby achieving higher rigidity and improved strength than a structure that is fastened only by snap fit.

[0117] Since the flange member 30 and the cup 20 are separate members, even if the diameter or other dimensions of the fuel pump 10 are changed to a different type, the same flange member 30 can be used to easily accommodate this.

[0118] Since the flange member 30 and the cup 20 are attached and fixed by the three guide rail structures 100 extending in the X direction, the impact resistance of the fuel supply device 1 can be improved. Furthermore, the flange member 30 and the cup 20 can be attached and fixed simply by sliding them in the X direction using the guide rail structure 100.

[0119] Just as the positions of locking piece 212 and locking protrusion 213 when slid correspond to inclined surface 120b and horizontal inclined surface 158b in the X direction, guide rail structure 100 and snap-fit ​​structure 200 are configured so that their positions in the X direction when slid correspond to each other, so when attaching and fixing flange member 30 to cup 20, it is possible to simultaneously set the positions of flange member 30 and cup 20 and to engage and fix flange member 30 and cup 20. This simplifies and reduces the work process in the attachment and fixation, improving work efficiency.

[0120] This will improve work efficiency and reduce work loss in production activities, making it possible to contribute to Goal 7 of the United Nations' Sustainable Development Goals (SDGs), which is to "Ensure access to affordable, reliable, sustainable and modern energy for all," and Goal 8, which is to "Promote sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all."

[0121] In this embodiment, the guide rail structure 100 is configured such that the vertical rail portion 111 and the horizontal rail portion 151 are formed on the flange member 30, and the vertical guide portion 112 and the horizontal guide portions 152 and 153 are formed on the cup 20, but conversely, the vertical rail portion 111 and the horizontal rail portion 151 can be formed on the cup 20, and the vertical guide portion 112 and the horizontal guide portions 152 and 153 can also be formed on the flange member 30.

[0122] Furthermore, although the one vertical guide rail structure 110 and the two horizontal guide rail structures 150 are configured to be parallel and have approximately the same length in the X direction, this is not limiting. For example, a configuration may be adopted that includes the above-described vertical guide rail structure 110 and a horizontal guide rail structure 150 whose length in the X direction is shortened only at the slide end.

[0123] Furthermore, the vertical guide rail structure 110 and the horizontal guide rail structure 150 may be offset in the X direction so that they do not overlap when viewed in the Y direction. In this case, the vertical guide rail structure 110 with a shorter length in the X direction may be arranged only at the slide start end, and the horizontal guide rail structure 150 with a shorter length in the X direction may be arranged only at the slide end end.

[0124] Alternatively, a configuration having one vertical guide rail structure 110 and one horizontal guide rail structure 150 may be used. In this case, a vertical guide rail structure 110 with a shortened length in the X direction can be arranged only at the slide start end, and a horizontal guide rail structure 150 with a shortened length in the X direction can be arranged only at the slide end end.

[0125] Alternatively, as shown in FIG. 10, the end face shapes in the YZ directions of the protrusions 117 and 118 are not rectangular, and the vertical guide rail structure 110 can be configured such that the contact surface 119 and the contact surfaces 120a, 120b, and 120c are inclined relative to the placement surface 30a and the slide surface 20a.

[0126] Furthermore, as shown in Figure 11, in the guide rail structure 100, the protrusions 117 and 118 that contact each other in the vertical rail portion 111 and the vertical guide portion 112 can be configured to protrude in only one direction in the Y direction, and these can be formed apart in the Y direction to function as a horizontal guide rail. [Explanation of symbols]

[0127] 1...Fuel supply device 2. Fuel tank 2b…Opening 10...Fuel pump 20...Cup (pump housing member) 20a...Slide surface 24...Slide section 24a, 24b...Side end surface 30...Flange unit (flange member) 30a…Placement surface 32...Flange 45...Pressure regulator 70...Regulator housing 71...Fuel flow path 73...Retaining recess 73a...Opening 100...Guide rail structure 110...Vertical guide rail structure 111...Vertical rail section 112...Vertical guide section 116...Opening 117,118...Protrusion 119,120…Contact surface 120a...Guidance surface 120b…Slanted surface (slanted part) 120c…Fixed surface 150...Horizontal guide rail structure 151...Horizontal rail section 152...Horizontal inner guide part (horizontal guide part) 153...Horizontal outer guide part (horizontal guide part) 155,158…Horizontal contact surface (contact surface) 156...Opening 158a…lateral guidance surface 158b… Laterally inclined surface (slanted part) 158c…Horizontal fixed surface 200...Snap fit structure 201, 211...Opening 202, 212...Latching piece 203, 213...Latching protrusions 220…Coating piece

Claims

1. A fuel supply device attached to a fuel tank and supplying fuel from the fuel tank to the outside of the fuel tank, a flange member that covers an opening in a bottom wall of the fuel tank; a fuel pump disposed horizontally at a bottom of the fuel tank along a placement surface of the flange member exposed inside the fuel tank; a cylindrical pump housing member that houses the fuel pump and is attached to the flange member; Equipped with a guide rail structure that regulates the mounting direction in which the flange member and the pump accommodating member slide and are mounted to each other so that the mounting direction is along the arrangement surface of the flange member; a snap-fit ​​structure that engages the flange member and the pump accommodating member with each other at a position that is a sliding end in the mounting direction to restrict their positions; Equipped with The guide rail structure includes: a vertical rail portion extending along the mounting direction and formed so as to protrude in a direction in which the flange member and the pump accommodating member face each other; a vertical guide portion that extends along the mounting direction, protrudes toward the vertical rail portion, is fitted to the vertical rail portion, and is slidable in the mounting direction along the vertical rail portion; a vertical guide rail structure that restricts the positions of the flange member and the pump accommodating member at least in the opposing direction, The vertical guide rail structure is The opposing ends of the vertical rail portions and the vertical guide portions are formed with protruding portions that protrude along the arrangement surface in a direction intersecting the mounting direction and are fitted together, one of the vertical rail portion and the vertical guide portion is formed on the flange member, and the other is formed on the pump accommodating member, The guide rail structure includes: a lateral rail portion extending along the mounting direction and formed so as to protrude in a direction in which the flange member and the pump accommodating member face each other; a lateral guide portion extending along the mounting direction and projecting toward the lateral rail portion, the lateral guide portion abutting against the lateral rail portion in a direction intersecting the mounting direction; a lateral guide rail structure for regulating the positions of the flange member and the pump accommodating member in the intersecting direction, The horizontal guide rail structure is one of the lateral rail portion and the lateral guide portion is formed on the flange member, and the other is formed on the pump accommodating member; A fuel supply device characterized by:

2. The vertical guide rail structure is At least one of the protruding portions has an inclined portion inclined so that the flange member and the pump accommodating member are closer to each other in the opposing direction at a slide end point than at a slide start point in the mounting direction.

2. The fuel supply system according to claim 1.

3. The vertical guide rail structure is The protrusion of the vertical rail portion and the protrusion of the vertical guide portion are in contact with each other on a contact surface thereof, the contact surface of the protrusion formed on the flange member is formed in a flat shape along the mounting direction, 3. The fuel supply device according to claim 2, wherein the contact surface of the protrusion formed on the pump housing member has the inclined portion.

4. The lateral guide rail structure is At least one of the lateral rail portion and the lateral guide portion has an inclined portion that is inclined so that the contact pressure between the lateral rail portion and the lateral guide portion in the intersecting direction is increased at a slide end point relative to a slide start point in the mounting direction.

2. The fuel supply system according to claim 1.

5. The guide rail structure includes: The vertical guide rail structure and the horizontal guide rail structure are arranged parallel to each other and spaced apart in the intersecting direction.

5. A fuel supply system according to claim 1 or 4.

6. The vertical guide rail structure is The cross-sectional profile of the vertical rail portion in the intersecting direction is formed into a substantially T-shape, The vertical guide portion is formed in a groove shape into which the vertical rail portion is slidably fitted, and the contact surface where the protrusion portion of the vertical rail portion and the protrusion portion of the vertical guide portion come into contact with each other is the contact surface of the protrusion formed on the flange member is formed in a plane that is aligned along the mounting direction and parallel to the placement surface, the contact surface of the protrusion formed on the pump accommodating member has an inclined portion that is inclined so that the flange member and the pump accommodating member are closer to each other in the opposing direction at a slide end rather than a slide start end in the mounting direction, and has an inclined surface that is inclined so as to move away from the arrangement surface toward the slide end rather than the slide start end in the mounting direction.

6. A fuel supply system according to claim 1.

7. The snap-fit ​​structure is disposed at a position where a slide end of the lateral guide rail structure in the mounting direction is extended.

5. The fuel supply system according to claim 4.

8. The flange member has: a fuel flow path that supplies fuel from the fuel tank to the outside of the fuel tank; a regulator accommodating portion that communicates with the fuel flow path and maintains a constant pressure in the fuel flow path, and that protrudes from the arrangement surface and that accommodates the fuel flow path; is formed, The snap-fit ​​structure is disposed at a position corresponding to a tip of the regulator accommodating portion in the opposing direction.

8. A fuel supply system according to claim 1.

9. an opening portion that communicates the fuel flow path with the inside of the fuel tank is formed at a tip end of the regulator housing portion; a covering piece is formed on the pump accommodating member at a position overlapping the opening when viewed from the opposing direction in a locking position by the snap-fit ​​structure; 9. The fuel supply system according to claim 8.

10. the covering piece has a gap with the edge of the opening when the covering piece is in the locked position by the snap-fit ​​structure; 10. The fuel supply system according to claim 9.

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