CN220705825U - Fuel supply device - Google Patents

Abstract

The present utility model relates to a fuel supply device including an injection pump operated by fuel from a fuel pump, in which a fuel flow path from the fuel pump to the injection pump is integrally formed by a container housing the fuel pump and the injection pump, and a pipe for allowing fuel to flow from the fuel pump to the injection pump is not required, thereby miniaturizing the device. The fuel tank is provided with a fuel pump (10) for sucking fuel in the fuel tank, an injection pump (20) for sucking and injecting the fuel in the fuel tank by utilizing negative pressure generated along with the flow of the fuel from the fuel pump (10), and a container (40) for accommodating the fuel pump (10) and the injection pump (20) and forming a fuel storage chamber (44) for storing the fuel sucked by the injection pump (20) below the fuel pump (10) and the injection pump (20). The container (40) is integrally formed with a fuel flow path (49) for flowing fuel from the discharge port (11) of the fuel pump (10) to the fuel inflow port (22 a) of the injection pump (20).

Description

Fuel supply device

Technical Field

The technology disclosed in this specification relates to a fuel supply apparatus.

Background

In the fuel supply device of patent document 1, a fuel pump is disposed in a fuel tank so as to be surrounded by a sub-tank, so that the fuel pump draws fuel stored in the sub-tank in the fuel tank and supplies the fuel to an engine. With this configuration, there is no problem that the fuel pump cannot supply the fuel to the engine although the fuel remains in the fuel tank. For example, the fuel pump is used to pump fuel at a low position on the side of the saddle-type fuel tank away from the fuel pump with the bulge portion interposed therebetween. In this fuel supply device, a part of the fuel supplied from the fuel pump to the engine is caused to flow into the injection pump, and the fuel is drawn into the sub-tank from a low position in the fuel tank by the operation of the injection pump.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2018-53857

Disclosure of Invention

Problems to be solved by the utility model

In the fuel supply device of patent document 1, in order to make fuel flow from the fuel pump to the injection pump, the discharge port of the fuel pump and the nozzle body of the injection pump are connected by a pipe. Therefore, a space for bending the pipe with a gentle curvature is required to perform piping, which hinders miniaturization of the apparatus.

The technical problem disclosed in the present specification is that, in a fuel supply device provided with an injection pump that operates by using fuel from a fuel pump, a fuel flow path from the fuel pump to the injection pump is integrally formed by a tank that accommodates the fuel pump and the injection pump. Thus, a pipe for flowing fuel from the fuel pump to the injection pump is not required, and the device is miniaturized.

Solution for solving the problem

In order to solve the above-described problems, the fuel supply device disclosed in the present specification adopts the following means.

The fuel supply device according to claim 1 includes: a fuel pump that draws fuel in a fuel tank and supplies the fuel to an engine; an injection pump that causes a part of fuel supplied from an injection port of the fuel pump to the engine to flow into the fuel inlet, sucks up the fuel in the fuel tank from the suction port by negative pressure generated in the negative pressure chamber in accordance with the flow of the fuel flowing into the fuel inlet, and injects the fuel from the injection port; and a container that accommodates the fuel pump and the injection pump, wherein a fuel storage chamber that stores the fuel sucked by the injection pump is formed below the fuel pump and the injection pump, and a fuel flow path that allows the fuel to flow from an ejection port of the fuel pump to a fuel inflow port of the injection pump is integrally formed.

According to the above-described claim 1, the fuel flow path for flowing the fuel from the discharge port of the fuel pump to the fuel inflow port of the injection pump is integrally formed by the container for housing the fuel pump and the injection pump. Therefore, a dedicated pipe for flowing fuel from the discharge port of the fuel pump to the fuel inflow port of the injection pump is not required, and the device can be miniaturized. Further, since the pipe is not required, the number of components for connecting the pipe and the pipe can be reduced, and the work accompanied with the connection of the pipe can be omitted.

In claim 2, in claim 1 above, the fuel supply device includes a pressure regulator that takes in fuel supplied from the fuel pump to the engine from a fuel intake port, detects the pressure of the taken-in fuel, adjusts the pressure of the fuel supplied to the engine to a set pressure, and discharges the fuel remaining after the adjustment from a fuel discharge port, three passages each having an upper end portion and a lower end portion opened are integrally formed in a manner aligned with each other with respect to the container, the fuel pump is inserted and arranged in passage 1, the injection pump is inserted and arranged in passage 2, the fuel pump discharge port, the fuel intake port of the injection pump, and the fuel intake port of the pressure regulator are arranged on the upper end sides of the passage 1, the passage 2, and the passage 3, the fuel intake port of the fuel pump is arranged in communication with each other in passage 1, the fuel intake port of the pressure regulator is arranged in communication with the fuel pump discharge port of the fuel pump, the fuel intake port of the fuel pump is arranged in communication with the fuel discharge port of the fuel pump, and the fuel intake port of the fuel pump is arranged in communication with the fuel intake port of the fuel pump.

According to claim 2, the fuel supply device is configured by inserting the fuel pump, the injection pump, and the pressure regulator into the tubular container having three passages, and the structure for fixing the fuel pump, the injection pump, and the pressure regulator can be simplified. Further, the fuel flow path connecting the fuel pump, the injection pump, and the pressure regulator to each other can be integrally formed from the container. The fuel pump, the injection pump, and the pressure regulator are disposed in only three passages, and communicate with the fuel reservoir chamber through the open ends of the lower ends of the passages. Therefore, the number of components can be reduced by reducing the types of piping connected to the fuel pump, the injection pump, and the pressure regulator, and the device can be miniaturized. In addition, the amount of work for assembling the respective components can be reduced.

With regard to claim 3, in the above-mentioned claim 1 or 2, the jet pump includes: a nozzle body that injects fuel from the fuel inlet port from an injection port at a high flow rate; an ejection passage extending linearly along an ejection line of the ejection port of the nozzle body so as to receive the fuel ejected from the ejection port of the nozzle body, one end of the ejection passage communicating with the negative pressure chamber and the other end communicating with the fuel reservoir chamber; and a suction passage which is formed by a passage in an inner tube of the double tube structure and which communicates with the negative pressure chamber at one end and the suction port at the other end, and which forms a space surrounding an outlet side of the injection port of the nozzle body.

According to the above-described claim 3, the suction passage and the discharge passage for receiving the injection fuel from the injection port of the nozzle body are constituted by a double pipe structure. Therefore, the nozzle body, the discharge passage, and the suction passage can be arranged in a straight line as a whole, and the jet pump can be miniaturized.

With regard to claim 4, in the above-described claim 3, the discharge passage, the suction passage, and the negative pressure chamber of the ejector pump are integrally formed with the container.

According to the above-described claim 4, the discharge passage, the suction passage, and the negative pressure chamber of the ejector pump are integrated with the container. Therefore, the number of components of the jet pump can be reduced, and the assembly work of the components forming each passage can be omitted.

In claim 5, in the 3 rd aspect, the discharge passage and the suction passage which constitute the double pipe structure are provided in the 2 nd passage of the container, and a stepped portion which supports the outer peripheral lower portion of the nozzle body from below is formed to protrude from the inner wall of the 2 nd passage in a state of being a space of the negative pressure chamber above the discharge passage and the suction passage, and the nozzle body is arranged so that the injection port faces downward and is fixed by a cover which is pressed into the inner wall surface of the 2 nd passage from above.

According to claim 5, the nozzle body is inserted from above the container toward the stepped portion, and the cap is pushed into the 2 nd passage from the nozzle body to form the jet pump. Therefore, the assembling work of the jet pump can be simplified. Furthermore, the number of components of the jet pump can be reduced.

In claim 6, in claim 2 above, a tubular connection port forming the fuel flow path is provided in an upper portion of the 1 st passage, a tubular discharge port is provided in an upper portion of the fuel pump so as to surround a periphery of the discharge port, the discharge port and the connection port are connected to each other in a fitting manner, thereby causing the discharge port of the fuel pump to communicate with the fuel flow path, the fuel flow path branches at a branch point of the connection port and communicates with a portion of the 2 nd passage on an upper side of the injection pump, and a check valve is provided in a portion of the fuel flow path communicating an upper portion of the 1 st passage and an upper portion of the 3 rd passage on the 3 rd passage side of the branch point, the check valve preventing a flow of fuel from the 3 rd passage to the 1 st passage and allowing a flow of fuel in an opposite direction.

According to the above-described claim 6, a check valve that prevents fuel flowing through the fuel supply path to the engine from flowing back to the fuel tank via the injection pump and the fuel pump when the operation of the fuel pump is stopped can be provided in the fuel flow path in the container.

Drawings

Fig. 1 is a perspective view showing an embodiment.

Fig. 2 is a plan view of the above embodiment.

Fig. 3 is an enlarged sectional view of line III-III of fig. 2.

Fig. 4 is an enlarged cross-sectional view of line IV-IV of fig. 2.

Fig. 5 is an enlarged view of the V-V line section of fig. 2.

Fig. 6 is an enlarged sectional view of line VI-VI of fig. 5.

Description of the reference numerals

1. A fuel supply device; 2. a pump unit; 10. a fuel pump; 11. an ejection port; 12. a fuel suction port; 13. a connecting pipe; 14. an ejection port; 15. an O-ring; 20. a jet pump; 21. a nozzle body; 21a, ejection ports; 21b, a reduced diameter portion; 21c, an expanded diameter portion; 22. a cover; 22a, a fuel inflow port; 23. a double tube construction; 23a, ejection passages; 23b, an inhalation passage; 23c, an ejection port; 23d, a negative pressure chamber; 23e, a step portion; 23f, closing walls; 24. a mesh filter; 25. an O-ring; 26. a suction port; 30. a voltage regulator; 31. a fuel intake port; 32. a fuel discharge port; 40. a container; 41. a 1 st path; 42. a 2 nd passage; 43. a 3 rd passage; 44. a fuel storage chamber; 45. an upper surface cover (cover); 46. a fuel filter; 47. a bottom mask; 48. a check valve; 49. a fuel flow path; 49a, branching points; 50. an outlet port; 51. buckle assembly; 52. a connection port; 61. a cover member; 62. and a connecting member.

Detailed Description

< integral Structure of an embodiment >

Fig. 1 and 2 show a fuel supply apparatus 1 as an embodiment. The fuel supply device 1 supplies fuel from a fuel tank to a gasoline engine of a vehicle, and includes a pump unit 2 having a fuel pump built therein, a cover member 61 fixed to a ceiling of the fuel tank, and a connecting member 62 connecting the pump unit 2 and the cover member 61. The cover member 61 is attached to the top plate in a state of covering the opening of the top plate of the fuel tank, and the pump unit 2 is set in a state in which the bottom cover 47 of the bottom surface is brought into contact with the bottom inside the fuel tank by the spring force of the coupling member 62. Here, the cover member 61 and the coupling member 62 are substantially the same as those of a known cover member and coupling member (for example, japanese patent No. 7046778), and detailed description thereof is omitted.

Basic structure of Pump Unit 2

As shown in fig. 3 and 4, the pump unit 2 is integrally formed with three passages in a vertically aligned arrangement in the resin container 40. The three passages are a 1 st passage 41, a 2 nd passage 42, and a 3 rd passage 43. The passages 41 to 43 are each substantially cylindrical in overall shape, and each have an upper end and a lower end open. A fuel pump 10 that draws fuel in the fuel tank is fixed to the 1 st passage 41. The injection pump 20 described later is fixed to the 2 nd passage 42. A voltage regulator 30 known in the art (for example, japanese patent No. 7046778) is fixed to the 3 rd passage 43.

As shown in fig. 3, the fuel pump 10 is driven by an electric motor (not shown), and a rotation shaft (not shown) is disposed in the up-down direction. The fuel pump 10 sucks fuel from a fuel suction port 12 disposed at a lower portion and discharges fuel from a discharge port 11 disposed at an upper portion. The fuel suction port 12 is formed by a connection pipe 13 connected to the lower portion of the fuel pump 10. The upper end of the 1 st passage 41 is closed except for a connection port 52 of the fuel flow path 49 connected to the discharge port 11. A discharge port 14 is provided in an upper portion of the fuel pump 10 so as to surround the discharge port 11. The discharge port 14 is fitted to the outer periphery of the connection port 52, so that the discharge port 11 communicates with the fuel flow path 49. An O-ring 15 is interposed between the inner peripheral surface of the discharge port 14 and the outer peripheral surface of the connection port 52 to ensure sealing between both surfaces. The fuel flow path 49 is branched at a branching point 49a in the connection port 52 so as to communicate with a portion of the 2 nd passage 42 above the injection pump 20.

As shown in fig. 3, the jet pump 20 has a fuel inflow port 22a at the upper portion and a discharge port 23c at the lower portion. As shown in fig. 4, the pressure regulator 30 has a fuel intake port 31 at the upper portion and a fuel discharge port 32 at the lower portion. The portion of the 3 rd passage 43 above the fuel intake port 31 communicates with an outlet port 50, which is an outlet for supplying fuel to the engine.

The upper ends of the 1 st, 2 nd and 3 rd passages 41, 42 and 43 are closed by a resin upper surface cover (corresponding to the cover in claim 2 above) 45. The upper surface cover 45 is welded to the upper end portion of the container 40 by a hot plate. At this time, the upper ends of the 1 st passage 41 and the 3 rd passage 43 are communicated with each other by the fuel flow path 49, and the upper end of the 2 nd passage 42 is shielded from the upper ends of the 1 st passage 41 and the 3 rd passage 43. However, as described above, the fuel flow path 49 of the 1 st passage 41 also communicates with the 2 nd passage 42, and therefore, the passages 41 to 43 communicate with each other through the fuel flow path 49. Thus, one fuel flow path 49 is formed below the upper surface cover 45, which is connected to the discharge port 11 of the fuel pump 10, the fuel inflow port 22a of the injection pump 20, and the fuel intake port 31 of the pressure regulator 30.

A check valve 48 is provided in the middle of the fuel flow path 49. Specifically, the check valve 48 is provided at an upper portion of the connection port 52 at a portion of the connection port 52 on the 3 rd passage 43 side of the branch point 49a of the fuel passage 49. The check valve 48 prevents fuel from flowing from the 3 rd passage 43 toward the 1 st passage 41 and the 2 nd passage 42 via the fuel flow path 49. The check valve 48 opens when the fuel pump 10 is operated to discharge fuel from the discharge port 11, and supplies fuel to the pressure regulator 30 and the outlet port 50. The check valve 48 closes when the fuel pump 10 stops operating, and fuel supplied to the engine side does not flow back from the outlet port 50 and flows out to the fuel pump 10 side and the injection pump 20 side.

On the other hand, the fuel suction port 12 of the fuel pump 10, the discharge port 23c of the injection pump 20, and the fuel discharge port 32 of the pressure regulator 30 communicate with the fuel reservoir 44 in the lower portion of the container 40. Strictly speaking, the fuel suction port 12 of the fuel pump 10 communicates with the fuel reservoir 44 via a fuel filter 46 described later. The fuel reservoir 44 forms a space for storing fuel.

The fuel reservoir 44 is opened at the lower side thereof, and covered with a fuel filter 46 to close the opening. The fuel filter 46 is formed in a circular disk bag shape, and an outer peripheral portion of the circular disk is pressure-bonded to an outer peripheral portion of the fuel reservoir 44 from below the fuel filter 46 by a bottom cover 47. Therefore, the outer edge portion of the bottom face cover 47 is fixed to the lower end outer edge portion of the container 40 forming the fuel reservoir 44 by the snap fit 51. The bottom surface of the bottom cover 47 has a mesh structure. Therefore, the fuel at the bottom of the fuel tank having the mesh structure passing through the bottom cover 47 and the fuel flowing into the fuel reservoir 44 from the discharge port 23c of the jet pump 20 and the fuel discharge port 32 of the pressure regulator 30 are filtered and flow into the bag of the disk-bag-shaped fuel filter 46. The fuel suction port 12 of the fuel pump 10 communicates with the inside of the bag of the disc-bag-shaped fuel filter 46. Accordingly, the fuel in the fuel tank filtered by the fuel filter 46 and the fuel in the fuel reservoir 44 are supplied to the fuel pump 10.

Structure of injection Pump

As shown in fig. 3, 5, and 6, the resin nozzle body 21 of the jet pump 20 is inserted and disposed in the middle of the passage 2 of the passage 42 so that the jet port 21a faces downward. The nozzle body 21 is a substantially cylindrical body, and includes an injection port 21a therein. Below the nozzle body 21, the double pipe structure 23 is formed integrally with the container 40. The inner tube of the double tube structure 23 is a discharge passage 23a penetrating in the vertical direction and extending in a straight line, and the outer tube is a suction passage 23b. The discharge passage 23a is penetrated by fuel injected from the injection port 21a of the nozzle body 21 at a high flow rate. Therefore, the ejection passage 23a extends linearly along the ejection line of the ejection port 21a of the nozzle body 21. The negative pressure chamber 23d is formed so that the ejection port 21a of the nozzle body 21 and the upper end of the ejection passage 23a face each other with a predetermined space therebetween. Thus, the upper end portion of the discharge passage 23a communicates with the negative pressure chamber 23d, and the lower end portion communicates with the fuel reservoir chamber 44 as the discharge port 23c. The space of the negative pressure chamber 23d surrounds the outlet side of the injection port 21a of the nozzle body 21, and is formed by an expanded diameter portion 21c having a diameter enlarged at the lower portion of the nozzle body 21 and a suction passage 23b.

When the fuel is injected from the injection port 21a of the nozzle body 21 into the injection passage 23a, a negative pressure is generated in the negative pressure chamber 23d due to the flow of the fuel. The upper end of the suction passage 23b communicates with the space of the negative pressure chamber 23d, and the lower end of the suction passage 23b is closed by the closing wall 23f and communicates with the suction port 26. The suction port 26 communicates with the bottom of the fuel tank, for example, the bottom of the side where the pump unit 2 is not disposed via a raised portion of the saddle-type fuel tank, by a predetermined pipe (not shown). Therefore, when the injection pump 20 is operated to generate negative pressure in the negative pressure chamber 23d, the fuel is sucked up from the bottom of the fuel tank. The sucked fuel is supplied from the discharge port 23c to the fuel reservoir 44 through the negative pressure chamber 23d and the discharge passage 23 a.

In order to support the nozzle body 21 in the 2 nd passage 42, as shown in fig. 6, a stepped portion 23e protruding into the passage is integrally formed on the inner wall of the 2 nd passage 42. The step portions 23e are formed in a pair so as to face each other on the inner wall of the 2 nd passage 42. On the other hand, as shown in fig. 5, a soft resin cover 22, which is a substantially cylindrical body, is in contact with the upper side of the nozzle body 21, and is pressed into the inner wall of the 2 nd passage 42 at the upper portion of the nozzle body 21. Therefore, the nozzle body 21 is fixed from above by the cover 22 in a state where the lower peripheral portion thereof is supported from below by the stepped portion 23e. An O-ring 25 is interposed between the outer peripheral surface of the reduced diameter portion 21b of the reduced diameter upper portion of the nozzle body 21 and the inner wall surface of the 2 nd passage 42 to prevent leakage of fuel therebetween.

The mesh filter 24 is disposed across the fuel inflow port 22a formed in the center portion of the cover 22, which is a cylindrical body. The mesh filter 24 functions to filter dust and the like of the fuel passing through the fuel inlet 22a and to prevent the fuel retained in the 2 nd passage 42 from naturally falling under the action of gravity in a state where the supply of the fuel from the fuel pump 10 is stopped. In order to function as the latter, the mesh size of the mesh filter 24 is set so that the fuel does not pass through the mesh of the mesh filter 24 by the surface tension of the fuel.

< action, effect of an embodiment >

When the fuel pump 10 is operated to draw fuel from the fuel suction port 12 and discharge the fuel from the discharge port 11, the fuel is split in the fuel passage 49 and flows into the 2 nd passage 42 and the 3 rd passage 43. The fuel flowing into the 2 nd passage 42 flows into the fuel inlet 22a of the injection pump 20, and is sucked from the fuel tank through the suction port 26 by the negative pressure generated in the negative pressure chamber 23d of the injection pump 20, and is stored in the fuel storage chamber 44 from the discharge port 23c. On the other hand, the fuel flowing into the 3 rd passage 43 is supplied to the engine via the outlet port 50. The fuel flowing into the 3 rd passage 43 is regulated to a set pressure by the pressure regulator 30. The fuel remaining by the adjustment of the fuel pressure is discharged from the fuel discharge port 32 of the pressure regulator 30 to the fuel reservoir 44 and stored. The fuel drawn from the fuel suction port 12 is the fuel inside the bag-shaped fuel filter 46, and is the fuel in the fuel reservoir 44 and the fuel in the bottom of the fuel tank.

When the fuel pump 10 stops operating, the fuel is not discharged from the discharge port 11 to the fuel flow path 49, and thus the fuel supply to the engine via the outlet port 50 is stopped. Further, the flow of fuel in the fuel flow path 49 is stopped, and therefore, the check valve 48 closes the valve. Accordingly, the fuel remaining on the engine side of the outlet port 50 is prevented from flowing back in the fuel flow path 49 and returning to the fuel tank via the fuel pump 10 and the injection pump 20.

In the above embodiment, the fuel flow path 49 through which the fuel flows from the discharge port 11 of the fuel pump 10 to the fuel inflow port 22a of the injection pump 20 and the fuel intake port 31 of the pressure regulator 30 is integrally formed by the container 40. Therefore, no dedicated pipe is required for flowing the fuel from the discharge port 11 of the fuel pump 10 to the fuel inflow port 22a of the injection pump 20 and the fuel intake port 31 of the pressure regulator 30. Accordingly, the pump unit 2 can be miniaturized in correspondence with the absence of the pipe. Further, since the pipe is not required, the pipe can be reduced, and the work accompanied with the connection of the pipe can be omitted.

In the above embodiment, three passages 41, 42, 43 are formed by integral molding in the tubular container 40, and the fuel pump 10, the injection pump 20, and the pressure regulator 30 are inserted into the respective passages 41, 42, 43 to constitute the pump unit 2. Therefore, the structure for fixing the fuel pump 10, the injection pump 20, and the pressure regulator 30, respectively, can be simplified. The fuel flow path 49 connecting the fuel pump 10, the injection pump 20, and the pressure regulator 30 to each other can be integrally formed from the container 40. The fuel pump 10, the injection pump 20, and the pressure regulator 30 are connected to the fuel reservoir 44 only through the three passages 41, 42, and 43, and through the open ends of the lower ends of the passages 41, 42, and 43. Therefore, the number of components constituting the pump unit 2 can be reduced by reducing the types of pipes connected to the fuel pump 10, the injection pump 20, and the pressure regulator 30, and the pump unit 2 can be miniaturized. Further, the amount of work required for assembling the fuel pump 10, the injection pump 20, and the pressure regulator 30 can be reduced.

In the above embodiment, the check valve 48 is provided in the middle of the fuel flow path 49 communicating with the 3 rd flow path 43 at the upper portion of the connection port 52 forming the fuel flow path 49. Thus, the check valve 48 is disposed within the container 40. Thus, the structure of the fuel supply device 1 can be simplified as compared with the case where the check valve 48 must be provided outside the container 40.

In the above embodiment, the jet pump 20 is configured such that the double pipe structure 23 is disposed below the nozzle body 21, and the discharge passage 23a for receiving the jet fuel from the injection port 21a of the nozzle body 21 and the suction passage 23b connected to the negative pressure chamber 23d constitute the double pipe structure 23. Therefore, the nozzle body 21, the discharge passage 23a, and the suction passage 23b can be arranged in a straight line as a whole, and the jet pump 20 can be miniaturized. The discharge passage 23a, the suction passage 23b, and the negative pressure chamber 23d constituting the jet pump 20 are formed of a double pipe structure 23 integral with the container 40. Therefore, the number of components of the jet pump 20 can be reduced, and the assembling work of the components can be reduced. The jet pump 20 inserts the nozzle body 21 into the stepped portion 23e of the 2 nd passage 42 from above the 2 nd passage 42, and presses the cap 22 into the 2 nd passage 42 from above to fix the nozzle body 21. Therefore, the assembling work of the injection pump 20 can be simplified, and the number of components of the injection pump 20 can be reduced.

< other embodiments >

The technology disclosed in the present specification has been described above for specific embodiments, but can be implemented in various other modes. For example, the above-described embodiment is a fuel supply device that supplies fuel to a gasoline engine of a vehicle, but may be a fuel supply device that supplies fuel to various engines other than a vehicle, or a diesel engine, not limited to a gasoline engine. In the above embodiment, the fuel pump 10, the injection pump 20, and the pressure regulator 30 are housed in the container 40 in the pump unit 2, but the fuel pump 10 and the injection pump 20 may be housed in the container 40, and the pressure regulator 30 may be mounted outside the container 40. In the above embodiment, the container 40, the passages 41 to 43, and the double pipe structure 23 are all cylindrical in shape, but may be square.

Claims (6)

1. A fuel supply device is characterized in that,

the fuel supply device is provided with:

a fuel pump that draws fuel in a fuel tank and supplies the fuel to an engine;

an injection pump that causes a part of fuel supplied from an injection port of the fuel pump to the engine to flow into the fuel inlet, sucks up the fuel in the fuel tank from the suction port by negative pressure generated in the negative pressure chamber in accordance with the flow of the fuel flowing into the fuel inlet, and injects the fuel from the injection port; and

a container which houses the fuel pump and the injection pump, wherein a fuel storage chamber for storing the fuel sucked by the injection pump is formed below the fuel pump and the injection pump,

the container integrally forms a fuel flow path for allowing fuel to flow from the discharge port of the fuel pump to the fuel inflow port of the injection pump.

2. The fuel supply apparatus according to claim 1, wherein,

the fuel supply device includes a pressure regulator that takes in fuel supplied from the fuel pump to the engine from a fuel intake port, detects the pressure of the fuel taken in, adjusts the pressure of the fuel supplied to the engine to a set pressure, and discharges the fuel remaining after the adjustment from a fuel discharge port,

in the case of the container to be used,

three passages each having an upper end and a lower end opened are integrally formed in an aligned arrangement, the fuel pump is inserted and arranged in the 1 st passage, the injection pump is inserted and arranged in the 2 nd passage, the pressure regulator is inserted and arranged in the 3 rd passage,

the discharge port of the fuel pump, the fuel inflow port of the injection pump, and the fuel intake port of the pressure regulator are disposed on the upper end sides of the 1 st passage, the 2 nd passage, and the 3 rd passage, and the upper end portions of the 1 st passage, the 2 nd passage, and the 3 rd passage are closed by a cover in a state of being mutually communicated, thereby forming a fuel flow path connecting the discharge port of the fuel pump, the fuel inflow port of the injection pump, and the fuel intake port of the pressure regulator,

the fuel suction port of the fuel pump, the discharge port of the injection pump, and the fuel discharge port of the pressure regulator are disposed at the lower end sides of the 1 st passage, the 2 nd passage, and the 3 rd passage, and are respectively communicated with the fuel reservoir chamber,

an outlet port as an outlet for supplying fuel to an engine is provided in the fuel flow path connected to the fuel intake port of the pressure regulator.

3. The fuel supply apparatus according to claim 1 or 2, wherein,

the jet pump is provided with:

a nozzle body that injects fuel from the fuel inlet port from an injection port at a high flow rate;

an ejection passage extending linearly along an ejection line of the ejection port of the nozzle body so as to receive the fuel ejected from the ejection port of the nozzle body, one end of the ejection passage communicating with the negative pressure chamber and the other end communicating with the fuel reservoir chamber; and

a suction passage having a passage in an inner tube of a double tube structure as the discharge passage and a passage in an outer tube of the double tube structure as the suction passage, one end of the suction passage communicating with the negative pressure chamber and the other end communicating with the suction port,

the negative pressure chamber forms a space surrounding an outlet side of the ejection port of the nozzle body.

4. A fuel supply apparatus according to claim 3, wherein,

the discharge passage, the suction passage, and the negative pressure chamber of the jet pump are integrally formed with the container.

5. A fuel supply apparatus according to claim 3, wherein,

the discharge passage and the suction passage which constitute the double tube structure are provided in the 2 nd passage of the container,

a step portion protruding from an inner wall of the 2 nd passage above the discharge passage and the suction passage with a space serving as the negative pressure chamber interposed therebetween to support a lower portion of an outer periphery of the nozzle body from below,

the nozzle body is disposed so that the injection port faces downward, and is fixed by a cap press-fitted from above to the inner wall surface of the 2 nd passage.

6. The fuel supply apparatus according to claim 2, wherein,

a tubular connection port forming the fuel flow path is provided at an upper portion of the 1 st passage,

a tubular discharge port is provided at an upper portion of the fuel pump so as to surround a periphery of the discharge port,

the discharge port and the connection port are connected to each other in a fitting manner, whereby the discharge port of the fuel pump communicates with the fuel flow path,

the fuel flow path branches at a branching point of the connection port and communicates with a portion of the 2 nd passage on an upper side of the injection pump,

in the fuel flow path that communicates the upper portion of the 1 st passage and the upper portion of the 3 rd passage, a check valve that prevents the flow of fuel from the 3 rd passage to the 1 st passage and permits the flow of fuel in the opposite direction is provided at a portion on the 3 rd passage side of the branching point.