Fuel supply device

Abstract

To integrally form a fuel flow passage from a fuel pump to a jet pump by using a container accommodating the fuel pump and the jet pump and thus eliminate the necessity of a tube for causing fuel to flow into the jet pump from the fuel pump so as to enable reduction in the size of a device, in the fuel supply device that includes the jet pump operated by the fuel from the fuel pump.SOLUTION: A fuel supply device includes: a fuel pump 10 that pumps up fuel in a fuel tank; a jet pump 20 that sucks up and discharges the fuel in the fuel tank by using negative pressure generated along with flowing of the fuel from the fuel pump 10; and a container 40 that accommodates the fuel pump 10 and the jet pump 20 and in which a fuel storage chamber 44 for storing the fuel sucked up by the jet pump 20 is formed below the fuel pump 10 and the jet pump 20. In the container 40, a fuel flow passage 49 for causing the fuel to flow from a discharge port 11 of the fuel pump 10 into a fuel inflow port 22a of the jet pump 20 is integrally formed.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a fuel supply device. [Background technology]

[0002] In the fuel supply device of Patent Document 1, the fuel pump is disposed within the fuel tank, surrounded by a sub-tank, so that the fuel pump pumps up fuel stored in the sub-tank and supplies it to the engine. This configuration prevents the problem of fuel remaining in the fuel tank but not being able to be supplied to the engine by the fuel pump. For example, in a saddle-shaped fuel tank, the fuel pump can pump up fuel located at a lower position on the side farther from the fuel pump across a raised portion. In this fuel supply device, a portion of the fuel supplied from the fuel pump to the engine flows into a jet pump, which then pumps up fuel from a lower position in the fuel tank into the sub-tank. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-53857 Summary of the Invention [Problem to be solved by the invention]

[0004] In the fuel supply device of Patent Document 1, a tube connects the discharge port of the fuel pump to the nozzle body of the jet pump in order to allow fuel to flow from the fuel pump to the jet pump. This requires space for piping the tube with a gentle curvature, which hinders miniaturization of the device.

[0005] The objective of the technology disclosed in this specification is to provide a fuel supply device equipped with a jet pump operated by fuel from a fuel pump, by forming a fuel flow path from the fuel pump to the jet pump integrally with a container that houses the fuel pump and the jet pump, thereby eliminating the need for a tube for flowing fuel from the fuel pump to the jet pump and reducing the size of the device. [Means for solving the problem]

[0006] In order to solve the above problems, the fuel supply device disclosed in this specification takes the following measures.

[0007] The first means comprises a fuel pump that draws up fuel in a fuel tank and supplies it to an engine, a jet pump that receives a portion of the fuel supplied to the engine from a discharge port of the fuel pump and flows into a fuel inlet, and draws up the fuel in the fuel tank from a suction port and discharges it from a discharge port by using negative pressure generated in a negative pressure chamber as the flow of the inflowing fuel occurs, and a container that houses the fuel pump and the jet pump and has a fuel storage chamber formed below the fuel pump and the jet pump for storing the fuel drawn up by the jet pump, the container having a fuel flow path integrally formed therewith that allows fuel to flow from the discharge port of the fuel pump to the fuel inlet of the jet pump. The jet pump comprises a nozzle body that accelerates the flow rate of fuel from a fuel inlet of the jet pump and injects it from an injection port; a discharge passage that extends linearly along the injection line of the injection port of the nozzle body to receive the fuel injected from the injection port of the nozzle body, the discharge passage having one end connected to the negative pressure chamber and the other end connected to the fuel storage chamber; and a suction passage that is a passage within an inner pipe of a double pipe structure and is formed by a passage within an outer pipe of the double pipe structure, the discharge passage having one end connected to the negative pressure chamber and the other end connected to the suction port, the negative pressure chamber forming a space that surrounds the outlet side of the injection port of the nozzle body. .

[0008] According to the first aspect, the fuel flow path that allows fuel to flow from the fuel pump discharge port to the jet pump fuel inlet is formed integrally with the fuel pump and the container that houses the jet pump. This eliminates the need for a dedicated tube that allows fuel to flow from the fuel pump discharge port to the jet pump fuel inlet, allowing the device to be made more compact. Furthermore, because the tube is no longer required, the number of tubes and parts for connecting the tubes can be reduced, and the work involved in connecting the tubes can be omitted. Furthermore, since the suction passage, together with the discharge passage that receives the injected fuel from the nozzle of the nozzle body, is constructed with a double-pipe structure, the nozzle body, discharge passage, and suction passage can be arranged in a straight line as a whole, making it possible to reduce the size of the jet pump.

[0009] The second means is the first means described above, and further comprises a pressure regulator that takes in fuel supplied from the fuel pump to the engine through a fuel inlet, senses the pressure of the taken-in fuel, adjusts the pressure of the fuel supplied to the engine to a set pressure, and discharges excess fuel resulting from the adjustment through a fuel outlet, and the container is integrally formed with three passages that are arranged in parallel with each other and have both upper and lower ends open, and the fuel pump is inserted into a first passage, the jet pump is inserted into a second passage, and the pressure regulator is inserted into a third passage, and the discharge port of the fuel pump, the fuel inlet of the jet pump, and the pressure regulator are inserted into a third passage. The fuel intake port of the pressure regulator is disposed at the upper end of each of the passages, and the upper ends of the passages are closed by a cover while remaining in communication with each other, thereby forming a fuel flow path that interconnects the discharge port of the fuel pump, the fuel inlet of the jet pump, and the fuel intake port of the pressure regulator, and the fuel suction port of the fuel pump, the discharge port of the jet pump, and the fuel discharge port of the pressure regulator are disposed at the lower end of each of the passages, and each is in communication with the fuel storage chamber, and the fuel flow path connected to the fuel intake port of the pressure regulator is provided with an outlet port that is an outlet for supplying fuel to the engine.

[0010] According to the second aspect, a fuel supply device is constructed by inserting a fuel pump, a jet pump, and a pressure regulator into a cylindrical container having three passages, thereby simplifying the structure for fixing the fuel pump, the jet pump, and the pressure regulator. Furthermore, a fuel flow path connecting the fuel pump, the jet pump, and the pressure regulator to each other can be integrally formed by the container. Furthermore, the fuel pump, the jet pump, and the pressure regulator are connected to the fuel reservoir chamber through the open ends of the lower ends of the passages simply by arranging them in the three passages. This reduces the number of piping connected to the fuel pump, the jet pump, and the pressure regulator, thereby reducing the number of parts and the size of the device. Furthermore, the labor required for assembling each part can be reduced.

[0013] No. 3 The means is the above-mentioned 1 or 2 In the above-mentioned means, the discharge passage, the suction passage, and the negative pressure chamber of the jet pump are integrally formed with the container.

[0014] The above item 3 According to the above means, the discharge passage, the suction passage, and the negative pressure chamber of the jet pump are integrated into the container, which reduces the number of parts of the jet pump and eliminates the assembly work of the parts that make up the passages.

[0015] No. 4 The means is the above-mentioned 1 or 2 In the means, the second passage of the container is provided with the discharge passage and the suction passage forming the double-pipe structure, and above the discharge passage and the suction passage, a step portion is formed protruding from the inner wall of the second passage to support the lower outer periphery of the nozzle body from below, with a space that becomes the negative pressure chamber sandwiched between them, and the nozzle body is positioned with the injection port facing downward and is fixed by a cap that is press-fitted from above onto the inner wall surface of the second passage.

[0016] The above item 4 According to this method, the nozzle body is inserted from above the container toward the step portion, and the cap is press-fitted into the second passage from above the nozzle body to form the jet pump. This simplifies the assembly work of the jet pump, and also reduces the number of parts of the jet pump.

[0017] No. 5The second means is the second means described above, wherein a tubular connection port forming the fuel flow path is provided at an upper part of the first passage, a tubular discharge port is provided at an upper part of the fuel pump surrounding a discharge port, the discharge port of the fuel pump is connected to the fuel flow path by fitting with the discharge port and the connection port, the fuel flow path branches at a branch point of the connection port and communicates with a part of the second passage above the jet pump, and the fuel flow path communicating an upper part of the first passage and an upper part of the third passage is provided with a check valve on the third passage side of the branch point that prevents fuel from flowing from the third passage to the first passage and allows fuel to flow in the opposite direction.

[0018] The above item 5 According to the above means, a check valve can be provided in the fuel flow path inside the container to prevent fuel in the fuel supply path to the engine from flowing back into the fuel tank through the jet pump and the fuel pump when the fuel pump is stopped. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing one embodiment. [Figure 2] FIG. 2 is a plan view of the embodiment. [Figure 3] 3 is an enlarged cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] 4 is an enlarged cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] FIG. 3 is an enlarged cross-sectional view taken along the line VV in FIG. 2. [Figure 6] 6 is an enlarged cross-sectional view taken along the line VI-VI in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0020] <Overall configuration of one embodiment> 1 and 2 show a fuel supply device 1 according to one embodiment. This fuel supply device 1 supplies fuel from a fuel tank to a gasoline engine of a vehicle, and includes a pump unit 2 incorporating a fuel pump, a lid member 61 fixed to the top plate of the fuel tank, and a connecting member 62 connecting the pump unit 2 to the lid member 61. The lid member 61 is attached to the top plate while covering the opening in the top plate of the fuel tank, and the pump unit 2 is installed with the bottom cover 47 on the bottom surface abutting against the bottom of the fuel tank due to the spring force of the connecting member 62. Here, the lid member 61 and the connecting member 62 are basically the same as those known in the art (for example, Japanese Patent No. 7046778), and detailed description thereof will be omitted here.

[0021] <Basic configuration of pump unit 2> As shown in Figures 3 and 4, the pump unit 2 has three passages integrally formed in a resin container 40 in a parallel arrangement along the vertical direction. The three passages are a first passage 41, a second passage 42, and a third passage 43. Each of the passages 41 to 43 has a generally cylindrical overall shape, with upper and lower ends open. A fuel pump 10 that pumps fuel from a fuel tank is fixed in the first passage 41. A jet pump 20, which will be described later, is fixed in the second passage 42. A publicly known pressure regulator 30 (see, for example, Japanese Patent No. 7046778) is fixed in the third passage 43.

[0022] As shown in FIG. 3 , fuel pump 10 is a pump driven by an electric motor (not shown) and is disposed with its rotating shaft (not shown) oriented vertically. Fuel pump 10 draws fuel through fuel suction port 12 located at the bottom and discharges fuel through discharge port 11 located at the top. Fuel suction port 12 is formed by a connecting pipe 13 connected to the bottom of fuel pump 10. The upper end of first passage 41 is closed except for connection port 52 of fuel flow path 49 to which discharge port 11 is connected. Discharge port 14 is provided at the top of fuel pump 10, surrounding discharge port 11. Discharge port 14 is fitted onto the outer periphery of connection port 52, thereby connecting discharge port 11 to fuel flow path 49. An O-ring 15 is interposed between the inner circumferential surface of discharge port 14 and the outer circumferential surface of connection port 52 to ensure sealing between the two surfaces. The fuel flow passage 49 branches at a branch point 49 a so as to communicate with the second passage 42 above the jet pump 20 at the connection port 52 .

[0023] As shown in Fig. 3, jet pump 20 has fuel inlet 22a located at the top and discharge port 23c located at the bottom. As shown in Fig. 4, pressure regulator 30 has fuel inlet 31 located at the top and fuel discharge port 32 located at the bottom. The portion of third passage 43 above fuel inlet 31 is connected to outlet port 50, which is an outlet for supplying fuel to the engine.

[0024] The upper ends of the first passage 41, the second passage 42, and the third passage 43 are closed by a resin top cover 45 (corresponding to the cover in the second means described above). The top cover 45 is fixed to the upper end of the container 40 by hot plate welding. At this time, the upper ends of the first passage 41 and the third passage 43 are connected to each other by a fuel flow path 49, and the upper end of the second passage 42 is blocked from the upper ends of the first passage 41 and the third passage 43. However, as described above, the fuel flow path 49 of the first passage 41 also communicates with the second passage 42, so the passages 41 to 43 are connected to each other by the fuel flow path 49. Therefore, a single fuel flow path 49 is formed below the top cover 45, connecting the discharge port 11 of the fuel pump 10, the fuel inlet 22a of the jet pump 20, and the fuel inlet 31 of the pressure regulator 30.

[0025] A check valve 48 is provided midway through the fuel flow path 49. Specifically, the check valve 48 is provided above the connection port 52, on the third passage 43 side of the branch point 49a of the fuel flow path 49 at the connection port 52. The check valve 48 prevents fuel from flowing from the third passage 43 to the first passage 41 and the second passage 42 through the fuel flow path 49. When the fuel pump 10 is operating and discharging fuel from the discharge port 11, the check valve 48 is opened to supply fuel to the pressure regulator 30 and the outlet port 50. When the fuel pump 10 is stopped operating, the check valve 48 is closed to prevent fuel supplied to the engine side from flowing back from the outlet port 50 to the fuel pump 10 side and the jet pump 20 side.

[0026] Meanwhile, the fuel suction port 12 of the fuel pump 10, the discharge port 23c of the jet pump 20, and the fuel discharge port 32 of the pressure regulator 30 are connected to a fuel storage chamber 44 at the bottom of the container 40. Strictly speaking, the fuel suction port 12 of the fuel pump 10 is connected to the fuel storage chamber 44 via a fuel filter 46, which will be described later. The fuel storage chamber 44 forms a space for storing fuel.

[0027] The fuel storage chamber 44 is open at the bottom, and a fuel filter 46 is placed over the fuel storage chamber 44 to close the open portion. The fuel filter 46 is formed in a disk-like bag shape, and the outer periphery of the disk is press-fitted to the outer periphery of the fuel storage chamber 44 from below the fuel filter 46 by a bottom cover 47. Therefore, the outer edge of the bottom cover 47 is fixed to the outer edge of the lower end of the container 40, which forms the fuel storage chamber 44, by a snap fit 51. The bottom surface of the bottom cover 47 has a mesh structure. Therefore, fuel from the bottom of the fuel tank that has passed through the mesh structure of the bottom cover 47 and fuel that has flowed into the fuel storage chamber 44 from the discharge port 23c of the jet pump 20 and the fuel discharge port 32 of the pressure regulator 30 flow into the bag of the disk-like bag-shaped fuel filter 46 after being filtered. The fuel suction port 12 of the fuel pump 10 is connected to the inside of the bag of the disk-like bag-shaped fuel filter 46. Therefore, the fuel pump 10 is supplied with fuel in the fuel tank filtered by the fuel filter 46 and fuel in the fuel storage chamber 44 .

[0028] <Jet pump configuration> 3, 5, and 6, the resin nozzle body 21 of the jet pump 20 is inserted into the second passage 42 with the nozzle orifice 21a facing downward. The nozzle body 21 is a roughly cylindrical body having the nozzle orifice 21a therein. Below the nozzle body 21, a double-pipe structure 23 is integrally formed with the container 40. The double-pipe structure 23 has an inner pipe that extends linearly in the vertical direction to form the discharge passage 23a, and an outer pipe that forms the suction passage 23b. The fuel injected at an increased flow rate from the nozzle orifice 21a of the nozzle body 21 passes through the discharge passage 23a. Therefore, the discharge passage 23a extends linearly along the injection line of the nozzle orifice 21a of the nozzle body 21. A negative pressure chamber 23d is formed between the upper end of the discharge passage 23a and the nozzle orifice 21a of the nozzle body 21, with a predetermined space between them. Therefore, the upper end of discharge passage 23a is connected to negative pressure chamber 23d, and the lower end thereof is connected as discharge port 23c to fuel storage chamber 44. The space of negative pressure chamber 23d is formed by enlarged diameter portion 21c, which surrounds the outlet side of injection port 21a of nozzle body 21 and has an enlarged diameter at the bottom of nozzle body 21, and by suction passage 23b.

[0029] When fuel is injected from the injection port 21a of the nozzle body 21 into the discharge passage 23a, a negative pressure is generated in the negative pressure chamber 23d due to the flow of fuel. The upper end of the suction passage 23b is connected to the space within the negative pressure chamber 23d, and the lower end of the suction passage 23b is closed by a closing wall 23f and connected to the suction port 26. The suction port 26 is connected to the bottom of the fuel tank, for example, the bottom of a saddle-shaped fuel tank on the side opposite to the pump unit 2, via a predetermined tube (not shown). Therefore, when negative pressure is generated in the negative pressure chamber 23d due to operation of the jet pump 20, fuel is sucked up from the bottom of the fuel tank. The sucked up fuel passes through the negative pressure chamber 23d and the discharge passage 23a and is supplied to the fuel storage chamber 44 from the discharge port 23c.

[0030] To support the nozzle body 21 within the second passage 42, a step 23e protruding into the passage is integrally formed on the inner wall of the second passage 42, as shown in FIG. 6. A pair of step portions 23e are formed facing each other on the inner wall of the second passage 42. Meanwhile, as shown in FIG. 5, a generally cylindrical soft resin cap 22 is press-fitted onto the inner wall of the second passage 42 at the top of the nozzle body 21, abutting the upper part of the nozzle body 21. Therefore, the nozzle body 21 is fixed from above by the cap 22, with the lower outer periphery supported from below by the step 23e. An O-ring 25 is inserted between the outer periphery surface of the reduced-diameter upper portion 21b of the nozzle body 21 and the inner wall surface of the second passage 42 to prevent fuel leakage therebetween.

[0031] A mesh filter 24 is disposed across fuel inlet 22a formed in the center of cylindrical cap 22. Mesh filter 24 functions to filter dust and the like from the fuel passing through fuel inlet 22a and to prevent fuel remaining in second passage 42 from naturally falling due to gravity when the supply of fuel from fuel pump 10 is stopped. To perform the latter function, mesh filter 24 has a mesh size that prevents fuel from passing through the mesh of mesh filter 24 due to the surface tension of the fuel.

[0032] <Actions and Effects of One Embodiment> When the fuel pump 10 is activated and pumps fuel through the fuel suction port 12 and discharges it from the discharge port 11, the fuel is divided by the fuel flow path 49 and flows into the second passage 42 and the third passage 43. The fuel that flows into the second passage 42 flows into the fuel inlet 22a of the jet pump 20, and the negative pressure generated in the negative pressure chamber 23d of the jet pump 20 causes fuel to be sucked from the fuel tank through the suction port 26, and the fuel is stored in the fuel storage chamber 44 through the discharge port 23c. Meanwhile, the fuel that flows into the third passage 43 is supplied to the engine through the outlet port 50. The fuel pressure of the fuel that flows into the third passage 43 is adjusted to a set pressure by the action of the pressure regulator 30. Any surplus fuel due to the adjustment of the fuel pressure is released from the fuel outlet port 32 of the pressure regulator 30 to the fuel storage chamber 44 and stored therein. The fuel pumped from the fuel inlet 12 is the fuel inside the bag-shaped fuel filter 46, the fuel in the fuel reservoir 44, and the fuel at the bottom of the fuel tank.

[0033] When the fuel pump 10 stops operating, fuel is not discharged from the discharge port 11 to the fuel flow path 49, and therefore the supply of fuel to the engine through the outlet port 50 is stopped. In addition, the flow of fuel through the fuel flow path 49 is stopped, and the check valve 48 is closed. This prevents the fuel remaining on the engine side from the outlet port 50 from flowing back through the fuel flow path 49 and returning to the fuel tank through the fuel pump 10 and the jet pump 20.

[0034] In the above embodiment, the fuel flow path 49, which allows fuel to flow from the discharge port 11 of the fuel pump 10 to the fuel inlet 22a of the jet pump 20 and the fuel inlet 31 of the pressure regulator 30, is integrally formed by the container 40. Therefore, it is possible to eliminate the need for dedicated tubes for allowing fuel to flow from the discharge port 11 of the fuel pump 10 to the fuel inlet 22a of the jet pump 20 and the fuel inlet 31 of the pressure regulator 30. Therefore, it is possible to reduce the size of the pump unit 2 by the amount corresponding to the elimination of the tubes. Moreover, because the tubes are no longer required, the number of tubes can be reduced, and the work associated with connecting the tubes can be omitted.

[0035] In the above embodiment, the pump unit 2 is configured by integrally molding three passages 41, 42, and 43 within the cylindrical container 40, and inserting the fuel pump 10, jet pump 20, and pressure regulator 30 into the respective passages 41, 42, and 43. This simplifies the configuration for fixing the fuel pump 10, jet pump 20, and pressure regulator 30. Furthermore, the fuel flow path 49 connecting the fuel pump 10, jet pump 20, and pressure regulator 30 to one another can be integrally formed within the container 40. Furthermore, the fuel pump 10, jet pump 20, and pressure regulator 30 are connected to the fuel reservoir chamber 44 through the open lower ends of the respective passages 41, 42, and 43 simply by being disposed within the three passages 41, 42, and 43. This reduces the number of piping components connected to the fuel pump 10, jet pump 20, and pressure regulator 30, thereby reducing the number of components constituting the pump unit 2 and enabling the pump unit 2 to be made more compact. In addition, the amount of work required to assemble the fuel pump 10, the jet pump 20, and the pressure regulator 30 can be reduced.

[0036] In the above embodiment, check valve 48 is installed in fuel flow path 49, which communicates with third passage 43, above connection port 52 that forms fuel flow path 49. Therefore, check valve 48 is installed inside container 40. Therefore, the configuration of fuel supply device 1 can be simplified compared to when check valve 48 must be installed outside container 40.

[0037] In the above embodiment, the jet pump 20 is configured with a double-pipe structure 23 disposed below the nozzle body 21. The double-pipe structure 23 defines a discharge passage 23a that receives fuel injected from the nozzle orifice 21a of the nozzle body 21 and a suction passage 23b that is connected to the negative pressure chamber 23d. Therefore, the nozzle body 21, the discharge passage 23a, and the suction passage 23b can be arranged linearly as a whole, allowing the jet pump 20 to be miniaturized. Furthermore, the discharge passage 23a, the suction passage 23b, and the negative pressure chamber 23d that constitute the jet pump 20 are formed by the double-pipe structure 23 integral with the container 40. Therefore, the number of parts of the jet pump 20 can be reduced, and the assembly work for each part can be simplified. Furthermore, in the jet pump 20, the nozzle body 21 is inserted from above the second passage 42 toward the step 23e of the second passage 42, and the cap 22 is press-fitted into the second passage 42 from above to secure the nozzle body 21. Therefore, the assembly work of the jet pump 20 can be simplified, and the number of parts of the jet pump 20 can be reduced.

[0038] <Other embodiments> Although the technology disclosed in this specification has been described above as a specific embodiment, it can be embodied in various other forms. For example, while the above embodiment describes a fuel supply device that supplies fuel to a gasoline engine of a vehicle, the fuel supply device may also be a fuel supply device that supplies fuel to various engines other than vehicles, including diesel engines, not limited to gasoline engines. Furthermore, in the above embodiment, the fuel pump 10, jet pump 20, and pressure regulator 30 in the pump unit 2 are all housed in the container 40. However, the fuel pump 10 and jet pump 20 may be housed in the container 40, and the pressure regulator 30 may be attached outside the container 40. Furthermore, in the above embodiment, the container 40, the passages 41-43, and the double-pipe structure 23 are all cylindrical, but they may also be rectangular. [Explanation of symbols]

[0039] 1 Fuel supply device 2 pump unit 10. Fuel pump 11 Discharge port 12 Fuel intake port 13 Connecting pipe 14 Discharge port 15 O-ring 20 Jet Pump 21 Nozzle body 21a Nozzle 21b Reduced diameter part 21c Expanded diameter part 22 Cap 22a Fuel inlet 23 Double tube structure 23a Discharge passage 23b Suction passage 23c outlet 23d Negative pressure chamber 23e Stepped section 23f Closed wall 24 mesh filter 25 O-ring 26 Suction port 30 Pressure Regulator 31 Fuel intake 32 Fuel outlet 40 containers 41 First Passage 42 Second Passage 43 Third Passage 44 Fuel storage chamber 45 Top cover (cover) 46 Fuel filter 47 Bottom cover 48 Check valve 49 Fuel flow path 49a Junction 50 Exit Port 51 Snap Fit 52 connection ports 61 Cover member 62 Connecting member

Claims

1. a fuel pump that pumps fuel from the fuel tank and supplies it to the engine; a jet pump that receives a portion of the fuel supplied from the discharge port of the fuel pump and flows into a fuel inlet, and sucks up fuel in the fuel tank through a suction port and discharges it from a discharge port by negative pressure generated in a negative pressure chamber as the inflowing fuel flows; a container that houses the fuel pump and the jet pump and has a fuel storage chamber formed below the fuel pump and the jet pump that stores the fuel sucked up by the jet pump, the container is integrally formed with a fuel flow path through which fuel flows from the discharge port of the fuel pump to the fuel inlet of the jet pump, The jet pump comprises: a nozzle body that increases the flow velocity of fuel from a fuel inlet of the jet pump and injects the fuel from an injection port; a discharge passage that extends linearly along the injection line of the injection port of the nozzle body to receive fuel injected from the injection port of the nozzle body, the discharge passage having one end connected to the negative pressure chamber and the other end connected to the fuel storage chamber; a passage in an inner pipe of the double-pipe structure serving as the discharge passage; and a suction passage formed by a passage in an outer pipe of the double-pipe structure, the suction passage having one end communicating with the negative pressure chamber and the other end communicating with the suction port, The negative pressure chamber forms a space surrounding the outlet side of the injection port of the nozzle body. Fuel supply device.

2. In claim 1, a pressure regulator that takes in fuel supplied from the fuel pump to the engine through a fuel inlet, senses the pressure of the taken-in fuel, adjusts the pressure of the fuel supplied to the engine to a set pressure, and discharges excess fuel resulting from the adjustment through a fuel outlet; The container comprises: three passages, each open at both upper and lower ends, are integrally formed in parallel arrangement, the fuel pump is inserted into a first passage, the jet pump is inserted into a second passage, and the pressure regulator is inserted into a third passage; a fuel flow path interconnecting the fuel pump discharge port, the jet pump fuel inlet, and the pressure regulator fuel inlet is formed by disposing the fuel pump discharge port, the jet pump fuel inlet, and the pressure regulator fuel inlet on the upper end side of each passage, and by closing the upper end of each passage with a cover while the passages are in communication with each other, a fuel suction port of the fuel pump, a discharge port of the jet pump, and a fuel discharge port of the pressure regulator are disposed on the lower end side of each passage, and are each connected to the fuel storage chamber; The fuel flow path connected to the fuel intake port of the pressure regulator is provided with an outlet port that is an outlet for supplying fuel to the engine. Fuel supply device.

3. In claim 1 or 2, The discharge passage, the suction passage, and the negative pressure chamber of the jet pump are integrally formed with the container. Fuel supply device.

4. In claim 1 or 2, the second passage of the container is provided with the discharge passage and the suction passage forming the double-pipe structure, a step portion is formed on an inner wall of the second passage above the discharge passage and the suction passage, the step portion supporting a lower outer periphery of the nozzle body from below with a space that becomes the negative pressure chamber sandwiched therebetween, The nozzle body is disposed with the injection port facing downward and is fixed to the inner wall surface of the second passage by a cap press-fitted from above. Fuel supply device.

5. In claim 2, a tubular connection port that forms the fuel flow path is provided at an upper portion of the first passage; A tubular discharge port is provided on the upper portion of the fuel pump so as to surround the discharge port, The discharge port and the connection port are fitted together to connect the discharge port of the fuel pump to the fuel flow path, the fuel flow path branches at a branch point of the connection port and communicates with the second passage above the jet pump, The fuel flow path that communicates the upper portion of the first passage with the upper portion of the third passage is provided with a check valve on the third passage side of the branch point that blocks fuel flow from the third passage to the first passage and allows fuel flow in the opposite direction. Fuel supply device.

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