JPH0697015B2 - Fuel supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is directed to a fuel pump mounted in a fuel tank mounted on a vehicle or the like, and the fuel pump supplies the fuel in the fuel tank to an internal combustion engine or the like. The present invention relates to a supply device.

[Conventional technology]

BACKGROUND ART Conventionally, in an automobile or the like, an in-tank fuel supply device in which a fuel pump is installed in a fuel tank that stores fuel for an internal combustion engine has been used.

For example, as disclosed in Japanese Patent Publication No. 62-29635,
When installing a fuel pump in a fuel tank, it is known that the fuel pump is installed while being pressed into the fuel tank.

However, in vehicles such as automobiles, when the liquid level in the fuel tank drops, the fuel in the fuel tank is concentrated in one place due to the centrifugal force and inclination due to turning, and the fuel around the fuel pump is exhausted and the fuel is sucked in. There is a problem that a so-called "breathing phenomenon" occurs, which hinders smooth fuel supply to the internal combustion engine.

In order to solve such a problem, it has been conventionally practiced to provide a sub tank for storing a small amount of fuel in the fuel tank and a fuel pump in the sub tank.

For example, in US Pat. No. 4,672,937 (June 16, 1987), a fuel tank is provided with an opening having a relatively small diameter, and a sub-tank is suspended from a cover that closes the opening, and the cover is mounted in the fuel tank. Discloses that the sub-tank is pressed into the fuel tank.

Further, in the technique disclosed in the above U.S. Patent, by fixing the fuel pump in the sub-tank, further fixing the fuel supply pipe, the fuel return pipe, etc. to the cover, by gathering the pipes and parts attached to the fuel tank, We are trying to simplify the assembly work.

[Problems to be solved by the invention]

However, in the technique disclosed in the above-mentioned US patent, a flexible screen (fuel filter) is provided below the sub tank, and the elasticity of the flexible screen supports the sub tank. For this reason, the sub-tank is not supported properly, and the fuel tank installed in the sub-tank may vibrate to cause the sub-tank to vibrate and generate noise.

Also, because the fuel pump is supported by the sub tank,
Since a complicated structure for fixing the fuel pump is required in the sub tank, the vibration of the fuel pump is more likely to be transmitted to the sub tank, and the vibration and noise may be promoted.

Further, since the work of fixing the fuel pump in the sub tank needs to be performed in the narrow cylindrical sub tank, there is a problem that the assembling work becomes difficult.

In view of the problems of the prior art as described above, the present invention provides a structure capable of reliably and easily assembling the sub tank and the fuel pump into the fuel tank, thereby effectively suppressing vibration noise and assembling the assembly. The purpose is to further simplify the attaching work.

[Means for solving problems]

In order to achieve the above object, the present invention has a ceiling surface and a bottom surface facing the ceiling surface, an opening is formed in the ceiling surface, and a fuel tank for storing fuel; A cover provided in the opening, covering the opening, supported by the cover, provided in the fuel tank in contact with the bottom surface, expands and contracts according to a distance between the cover and the bottom surface, A sub-tank for storing fuel inside, a fuel supply pipe that hangs from the cover toward the inside of the fuel tank and supplies the fuel in the fuel tank to the outside, and a sub-tank supported and provided in the sub-tank. A fuel pump connected to the fuel supply pipe for supplying the fuel in the fuel tank to the outside; and a fuel pump formed below the sub-tank for supplying the fuel in the fuel tank to the front. An intake port introduced into the intake port of the fuel pump, and the intake port of the fuel pump provided in the intake port and closing the intake port when the fuel level in the fuel tank becomes lower than the intake port. A valve that stops the introduction of fuel to the mouth and supplies fuel only to the inside of the sub tank to the suction port of the fuel pump; and a valve that hangs from the cover toward the inside of the sub tank inside the fuel tank and passes through the fuel supply pipe. A fuel return pipe that returns fuel supplied to the outside into the sub-tank, and a fuel return pipe that is provided between the cover and the fuel pump, expands and contracts according to the distance between the cover and the fuel pump, and Pressing means for pressing the sub tank toward the inside of the sub tank and pressing the sub tank toward the bottom surface of the fuel tank through the fuel pump. Adopt the technical means of the fuel supply apparatus characterized by obtaining.

[Action]

According to the above configuration of the present invention, the sub tank is supported by the cover that covers the opening formed in the fuel tank, and the fuel pump is installed in the sub tank. Moreover, the sub tank expands and contracts according to the distance between the cover and the bottom surface of the fuel tank, and comes into contact with the bottom surface of the fuel tank with the cover attached to the fuel tank. A fuel pump is supported in the sub tank.

In the present invention, a pressing member is provided between the cover and the fuel pump, and the pressing member presses the fuel pump into the sub tank and the sub tank against the bottom surface of the fuel tank. Therefore, the fuel pump is pressed into the sub tank, so that the fuel pump can be reliably and firmly fixed even if the fixing structure in the sub tank is simplified. Further, since the fuel pump that vibrates according to the operation is pressed by the pressing means, the vibration of the fuel pump is suppressed, and the vibration is suppressed because the sub tank is pressed and fixed to the fuel tank to suppress the vibration. Noise is effectively suppressed. Therefore, according to the present invention, the fuel pump, the sub-tank, and the fuel tank are fixed to each other by the pressing force of the pressing member only by attaching the cover to the opening of the fuel tank, and the sub-tank and the fuel tank can be reliably assembled by a simple assembly work. A pump and a fuel tank are installed in the fuel tank.

Further, a fuel supply pipe and a fuel return pipe are fixed to the cover. Then, the discharge port of the fuel pump is connected to the fuel supply pipe. On the other hand, at the lower part of the sub-tank, there is provided an intake for supplying the fuel of the fuel tank to the intake of the fuel pump. As a result, the fuel in the fuel tank is sucked by the fuel pump, discharged into the fuel supply pipe, and supplied outside the fuel tank. Then, a part of the fuel supplied to the outside of the fuel tank is returned to the sub tank through the fuel return pipe. Further, a valve is provided at the intake port, and when the fuel liquid level in the fuel tank drops, the intake port is closed, the fuel supply from the fuel tank to the fuel pump is stopped, and the fuel liquid level in the fuel tank rises. When it drops, fuel is supplied to the fuel pump only from within the sub-tank. As a result, even if the fuel in the fuel tank is biased and the fuel is exhausted around the intake port, the fuel can be reliably supplied continuously.

〔The invention's effect〕

As described above, according to the present invention, it is possible to easily perform the work of attaching the sub tank and the fuel pump to the fuel tank, and of course the work of assembling the cover, the sub tank and the fuel pump. Moreover, since the fuel pump is pressed into the sub tank by the pressing means and the sub tank is pressed to the fuel tank via the fuel pump,
The sub tank, the fuel pump, and the fuel tank can be securely fixed to each other, and vibration noise can be prevented. As described above, according to the present invention, there is an effect that vibration noise can be effectively suppressed and the assembling work can be further simplified.

〔Example〕

Hereinafter, an apparatus according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a ceiling surface 1a mounted on a vehicle.
And a fuel tank having a bottom surface 1b and a side surface 1c. An opening 2 is formed in the ceiling surface 1a of the fuel tank 1. A cover 3 is attached to the opening 2 with attaching screws or the like. 4 is a packing for sealing between the cover 3 and the fuel tank 1.

The cover 3 has the fuel tank 1 inside the fuel tank 1.
The sub-tank 5 arranged so as to extend toward the bottom surface 1b of the is fixed. And the bottom wall 5a of this sub tank 5
Is provided with an inlet 6 for taking the fuel in the fuel tank 1 into the sub tank 5. Further, there is provided a fuel supply pipe 7 penetrating the cover 3 and fixed to the cover 3 and arranged between the inside of the fuel tank 1 and the engine of the vehicle outside the fuel tank 1.

A fuel pump 9 having a suction port 8 facing the bottom wall 5a of the sub tank 5 is provided inside the sub tank. The discharge port 10 of the fuel pump 9 is attached in a direction toward the ceiling surface 1a of the fuel tank 1. And outlet 10
Is connected to the fuel supply pipe 7 so that the fuel can be sent.

Part of the fuel discharged from the discharge port 10 of the fuel pump 9 is returned to the sub tank 5 via the fuel return pipe 11. The fuel return pipe 11 may be branched directly from the above-mentioned fuel supply pipe 7 outside the fuel tank, or may be branched from a well-known fuel pressure adjusting device provided in the vehicle to face the inside of the fuel tank. Good. The manner of connecting the two fuel return pipes 11 is well known and will not be described.

A jet pump 12 is connected to the fuel return pipe 11. The jet pump 12 is attached to the sub-tank 5 and has a fuel discharge port 13 and a fuel suction port 14 (FIG. 2). The fuel fluid in the jet pump flowing from the fuel return pipe 11 toward the fuel discharge port 13 The fuel outside the sub tank 5 is transferred into the sub tank 5 from the fuel suction port 14 (FIG. 2) by energy. Inside the jet pump 12, the fuel in the sub tank 5 is transferred from the fuel discharge port 13 of the jet pump 12 to the fuel suction port of the jet pump 12.
A first check valve 13a is provided to prevent outflow toward 14. The first check valve 13a is formed by connecting a well-known check valve made of rubber in the shape of a duck bill (duck's beak) to the fuel discharge port 13 of the jet pump.

Further, a second check valve 15 is provided which is attached to the intake 6 of the sub tank 5 and prevents the fuel in the sub tank 5 from flowing out into the fuel tank 1 outside the sub tank 5. The second check valve is an umbrella-shaped valve made of rubber.

The sub-tank 5 is composed of a metal bracket 20 welded to the cover 3, a synthetic resin tubular member 21 joined to the bracket, and a cup-shaped member 22 joined to the non-bracket side of the tubular member 21. Become. Further, the jet pump 12 has one end of the jet pump 12 connected to the fuel return pipe 11 and the other end provided with a fuel discharge port 13 and a pipe-shaped main body portion 25 and a branch from the pipe-shaped main body blowing to the branched tip portion. It is composed of a branch pipe portion 26 provided with a fuel suction port 14 (Fig. 2). The pipe-shaped main body 25 of the jet pump 12 is resin-molded inside the tubular member 21 of the sub-tank 5 integrally with the tubular member.

The fuel discharge port 13 of the jet pump 12 is configured to discharge fuel in a direction substantially perpendicular to the longitudinal direction of the fuel pump 9, that is, the direction from the ceiling surface 1a to the bottom surface 1b of the fuel tank.

The sub-tank 5 has a synthetic resin sub-tank main body composed of a tubular member 21 and a cup-shaped member 22 so that fuel can be stored inside the sub-tank main bodies 21 and 22. Then, on the bracket side of the sub tank main body, that is, on the upper surface of the tubular member, the engagement projection 30 is integrally formed, and the bracket 20 is inserted between the engagement projections 30. 22
The bracket 20 and the sub-tank main body are connected to each other so as to be slidable in the longitudinal direction of the sub-tank main body. Second
This state is clearly shown in the figure, and 30 is a protrusion integrally formed on the upper end of the tubular member, and the bracket 20 is inserted into the gap between the protrusions 30. A hook portion 20a is formed at the tip of the bracket 20 so that the bracket 20 does not come out from between the protrusions 30. Moreover, the tubular member 21 is slidably attached to the bracket 20. Therefore, the positions of the tubular member 21 and the cup-shaped member 22 forming the sub-tank body with respect to the cover 3 can be changed in the vertical direction of FIG. That is, the length from the cover 3 to the bottom wall 5a of the cup-shaped member 22 is configured to be expandable and contractible.

Cushion members 35, 36, are provided between the bottom wall 5a of the sub tank bodies 21 and 22 on the side opposite to the bracket and the bottom surface 1b of the fuel tank 1.
37 and 38 (Fig. 2) are provided. The cushion members 36 to 38 are connected and integrated with each other by a web (water-dragging thin plate portion 39) formed of the cushion members.

An intermediate pipe 40 is provided inside the tubular member 21 of the sub-tank 5 so as to connect the discharge port 10 of the fuel pump 9 and the fuel supply pipe 7, and an outer pipe 41 made of synthetic resin is provided outside the intermediate pipe 40. Is provided. Its outer pipe 41
The lower end of FIG. 1 covers the vicinity of the discharge port 10 of the fuel pump 9. The outer pipe 41 is made of synthetic resin, and the conductor portion 46 of the electric wire 45 that supplies power to the fuel pump 9 passes through the outer pipe 41.

A coil spring 50 is provided on the upper end of the outer pipe 41. The coil spring 50 is wound around the outer circumference of the fuel supply pipe 7, the upper end is a bulging portion 7a integrally formed with the fuel supply pipe, and the lower end is the outer pipe 41. Is locked at the upper end of. As a result, the coil spring 50 is in the compressed state in the state shown in FIG. 1, and the elastic pressing force of the coil spring 50 acts in the direction of moving the tubular member 21 of the sub tank 5 away from the cover 3.

A cup-shaped cushion material 55 is provided on the suction port 8 side of the fuel pump 9.
A ring-shaped filter 56 is provided around the cup-shaped cushion material 55. The cup-shaped member 22 of the sub-tank 5 is arranged on the outer periphery of the filter 56, and the fuel pump 9 in the direction perpendicular to the longitudinal direction of the fuel pump 9 is provided.
The filter 56 absorbs the vibrations of the.

Next, the detailed structure will be further described.

Inside the tubular member 21 and the cup-shaped member 22 of the sub tank 5, there is a volume capable of storing at least 450 cc of fuel. Also, cushion members 36 to 38 for supporting the sub tank
Is made of oil-resistant rubber, and this cushion member is embedded and assembled in the recess formed in the cup-shaped member 22. The second check valve 15 consisting of an umbrella type check valve has at least a valve opening pressure of 0.35 g / cm ² and an opening so that the second check valve 15 can be opened even when the remaining fuel amount in the fuel tank 1 is about 15 to 20 mm. Area 20
A size of about 0 mm ² is required. The filter 56 has a donut-shaped tube shape, but may have a bellows-shaped donut-shaped cross-sectional shape so as to come into line contact with the cup-type cushion material 55.

The fuel supply pipe 7 is connected to the outer pipe 41 via an O-ring 60 and is inserted inside the hollow pipe 40. By adjusting the connection between the bracket 20 and the tubular member 21, the length of the sub-tank 5 from the cover 3 changes, but the fuel supply pipe 7 slides in the intermediate pipe 40 according to this change. Has become. At this time, the fuel supply pipe 7 slides on the inner wall of the intermediate pipe 40 and the inner wall of the packing 60, and the length of the space from the fuel supply hole provided at the lower end 7b of the fuel supply pipe 7 to the discharge port 10 of the fuel pump 9 is reduced. It can be set freely.

Reference numeral 61 is a fuel supply port, which is an inlet for supplying fuel into the fuel tank 1 from the outside. Then, a small amount of gasoline of about 8 is put in the fuel tank 1 when the vehicle is completed. The second non-return valve due to the pressure of this gasoline of about 8
15 is opened and fuel enters the sub tank 5 through the intake 6 at the bottom of the sub tank. The fuel in the sub tank 5 is the fuel pump 9
When the fuel pump 9 accumulates up to the height of the suction port 8, the fuel pump 9 becomes ready to discharge the fuel from the discharge port 10. When the fuel pump 9 discharges the fuel and the liquid level of the fuel in the sub tank drops, the second check valve 15 opens and the fuel flows from the intake 6 to the sub tank 5.
The fuel tank 1 that has penetrated into the inside of the sub tank 5
The amount of fuel having a fuel liquid level almost equal to the liquid level of the fuel inside is secured. In other words, the second check valve 15 secures the fuel in the sub tank 5 which has a fuel height substantially equal to the liquid level of the fuel in the fuel tank 1 at least.

Reference numeral 70 denotes a resin connector which is provided so as to penetrate the cover 3, and wiring outside the vehicle is connected to the connector 70 to supply a DC voltage of 12 V to the fuel pump 9. The fuel return pipe 11 is inserted inside the pipe-shaped main body 25 of the jet pump 12, and an O-ring 71 is provided between the inner wall of the pipe-shaped main body 25 and the fuel return pipe 11. A nozzle portion 72 and a diffuser portion 73 for injecting fuel are formed in a pipe-shaped main body portion of the jet pump 12 in a known manner.

An O-ring 74 is provided at the lower end of the intermediate pipe 40, and a ring-shaped spacer 75 is provided at the lower end of the O-ring 74. Next, the tubular member 21 and the cup-shaped member 22 are joined by fitting, and an O-ring 77 is arranged between them. A ring 76 is provided as a spacer between the tubular member 21 and the filter 56.

In FIG. 2, the fuel discharge port 14 formed at the lower end of the branch pipe portion 26 of the jet pump 12 is provided with a bellows-shaped pipe filter 80. The pipe filter 80 expands and contracts from the bottom wall 5a of the sub tank 5. It projects freely. Therefore, the lower end of the pipe-shaped filter 80 is configured to surely come into contact with the bottom surface 1b of the fuel tank 1 until the end so that the fuel is reliably taken into the sub tank 5. It should be noted that this pipe-shaped filter has a self-priming ability of sucking fuel into the filter by utilizing a capillary phenomenon, and it is formed by using a fibrous member as is well known.

Next, the operation of the embodiment having the above configuration will be described.
When a small amount of fuel is supplied from the fuel supply port 61 into the fuel tank 1 and a fuel liquid level 81 having a height of about 15 to 20 mm is secured as shown in FIG. 1, the pressure of this fuel causes the second check valve. When the valve 15 opens, the intake port 8 of the fuel pump 9 is filled with fuel via the filter 56 in the sub tank 5, and in this state, the fuel pump 9
When a voltage is applied to the fuel pump 9 and the fuel pump 9 is operated, the fuel sucked from the suction port 8 is supplied to the engine of the vehicle through the discharge port 10 and the fuel supply pipe 7. Although not shown, a pressure regulator for adjusting the pressure of the fuel supplied to the vehicle engine is provided on the engine side of the vehicle, and excess fuel is supplied to the fuel tank 1 through the fuel return pipe 11 as is well known. It is supposed to be returned inside. The fuel returned to the fuel tank 1 via the fuel return pipe 11 in this manner is supplied to the jet pump 12. Then, fuel is injected from the nozzle portion 72 in the jet pump 12 toward the diffuser portion 73, and this fuel is released into the sub tank 5 by opening the first check valve 13a provided in the fuel discharge port 13. It At this time, a strong negative pressure is generated at the lower end of the nozzle portion 72 of the jet pump 12, and this negative pressure causes the fuel to flow from the fuel suction port 14 of FIG. 2 through the branch pipe portion 26 of the jet pump 12 into the branch pipe portion. It is sucked into 26. That is, since the pipe-shaped filter 80 provided at the fuel suction port 14 is filled with the fuel due to the capillary action of the pipe-shaped filter 80, the negative pressure in the branch pipe portion 26 causes the fuel to be sucked up into the branch pipe portion 26. The sucked fuel is further discharged into the sub tank 5 through the negative pressure portion at the lower end of the nozzle portion 72, the diffuser portion 73, and the fuel discharge port 13. Therefore, in the process of continuing the operation of the fuel pump 9 and continuously supplying the fuel to the vehicle engine side, the fuel level in the sub tank 5 is higher than the fuel level 81 in the tank 1.
Fuel with 82 is secured. The height of the fuel in the sub tank 5 is up to the upper end of the tubular member 21 at the maximum, and when more fuel is supplied into the sub tank 5, the fuel is returned to the fuel tank 1 from the gap of the bracket 20. Sub tank 5
The fuel stored inside the fuel pump 9 passes through the filter 56.
To the suction port 8 and is taken into the fuel pump 9 from the suction port 8 and discharged again from the discharge port 10. Therefore, even if the fuel level 81 in the fuel tank 1 is lowered and the fuel in the fuel tank 1 outside the sub tank 5 is exhausted, the fuel pump 9 can continue to supply the fuel to the vehicle engine as long as the fuel is in the sub tank 5. it can. Further, the second check valve 15 prevents the fuel from flowing back to the outside of the sub tank 5 from the sub tank 5 through the intake port 6 provided in the bottom wall 5a of the sub tank 5. Further, the reverse flow of the fuel to the diffuser section 73, the branch pipe section 26 and the fuel suction port 14 of FIG. Outlet
It is blocked by a rubber duckbill type check valve attached to 13 or a first check valve 13a. Therefore, the fuel liquid level 82 in the sub tank 5 is normally kept higher than the fuel liquid level 81 in the tank 1.

FIG. 3 shows a state in which the fuel liquid levels 81 and 82 are inclined due to sudden acceleration / deceleration, a sharp turn when the fuel in the tank is small, or parking on a sloping ground. The fuel liquid level from the suction port 8 of the fuel pump 9 is inclined.
Even when 81 goes down, the fuel in the sub-tank 5 allows the fuel pump to continue to effectively discharge the fuel without sucking air from the suction port 8.

Further, the tubular member 21 is formed of synthetic resin, and at the same time, the pipe-shaped main body 25 of the jet pump 12 can be formed at the same time, so that the jet pump can be manufactured relatively easily.
And a pipe-shaped main body integrally formed with this tubular member 21.
The jet pump 12 is completed by inserting and fixing the nozzle portion 72 and the diffuser portion 73 into the inside of 25 and connecting the branch pipe 26 to the pipe-shaped main body 25.

Further, since the fuel discharge port 13 of the jet pump is designed to discharge the fuel in a direction substantially perpendicular to the longitudinal direction of the fuel pump 9, even if vapor (fuel vapor) is discharged from the fuel discharge port 13 of the jet pump 12. It is possible to minimize suction of this vapor from the suction port 8 of the fuel pump 9.

The sub-tank 5 is configured so that the bracket 20 and the tubular member 21 can be slidably connected to each other so that the entire length of the sub-tank 5 can be adjusted. Therefore, even if the size of the fuel tank 1 is changed, the entire length of the sub-tank 5 is adjusted. The fuel supply pipe 7 and the discharge port of the fuel pump 9 can be set freely.
The size between 10 and 10 can also be adjusted by sliding the fuel supply pipe 7 in the intermediate pipe 40. In this case, the sliding action of the O-ring 71 between the fuel return pipe 11 and the pipe-shaped main body of the jet pump 12 is performed as the sub-tank 5 expands and contracts.

In this way, since the length (height) of the sub tank 5 can be adjusted, firstly, even if the fuel tank internal pressure changes and the tank height changes, the height adjusting function keeps the sub tank always on the bottom surface of the tank. Since it is pressed against, the last fuel can be sucked in, and secondly, even if the size of the tank changes, the sub-tank or the like can be used in common.

The length of the sub tank 5 is adjustable, and the bottom wall 5a of the sub tank 5 is adjacent to the bottom surface 1b of the fuel tank 1, but between the bottom wall 5a of the sub tank 5 and the bottom surface 1b of the fuel tank 1. Since the cushion members 35 to 38 are provided, there is no concern that contact noise is generated. In addition, the outer pipe 41
Since the coil spring 50 is provided between the upper end of 7a, that is, the cover 3 side, the sub tank 5 is constantly pressed against the bottom surface 1b side of the tank 1 by the coil spring 50, and the sub tank 5 is separated from the sub tank 5 portion by the vibration of the vehicle. No abnormal noise is generated. The fuel pump 9 is composed of a well-known regenerative pump having a closed-blade type impeller that is rotationally driven by a DC motor, but the fuel pump 9 can be used without limitation.

When the fuel return pipe 11 is used to return excess fuel that could not be used up in the vehicle engine to the fuel tank 1, the amount of fuel flowing through the fuel return pipe 11 changes depending on the state of the vehicle engine. Therefore, even when the fuel consumption of the engine is the maximum, that is, when the fuel returning to the fuel tank 2 through the fuel supply pipe 7 is the minimum, the fuel exceeding the fuel consumption of the vehicle engine is transferred into the sub tank 5 by the jet pump 12. As described above, the discharge performance of the fuel pump 9 and the performance of the jet pump 12 should be determined.

In FIG. 1, an electric wire for supplying power to the fuel pump 9
45 is provided with slack between the connector 70 and the fuel pump 9 so as to be able to accommodate expansion and contraction of the length of the sub tank 5.

Further, the vibration of the fuel pump 9 is absorbed by the filter 56 and the cup-shaped cushion material 55, and the fuel pump 9 and the fuel supply pipe 7 are connected by the intermediate pipe 40 and the outer pipe 41 made of synthetic resin. The vibration sound generated from the pump 9 is not transmitted to the fuel tank 1.

Although the sub-tank 5 is mounted perpendicularly to the bottom surface 1b of the fuel tank 1 in the above embodiment, it may be mounted at an angle.

According to the embodiment described above, the sub-tank 5 is hung on the cover 3, and the components such as the fuel pump 9 and the jet pump 12 are assembled in the sub-tank 5, so that the cover 3 is simply attached to the fuel tank 1. , Fuel pump 9
A plurality of parts such as can be installed in the fuel tank 1.

Further, the fuel pump 9 is supported on the bottom of the sub tank 5 by a simple structure in which the fuel pump 9 is inserted from the upper portion of the sub tank 5 together with the cup-shaped cushioning material 55, so that the fuel pump 9 can be easily mounted in the sub tank 5. . Moreover,
When the fuel pump 9 is attached to the fuel tank 1, the fuel pump 9 is pressed by the coil spring 50 toward the bottom surface of the sub tank 5, and is pressed together with the sub tank 5 toward the bottom surface 1b of the fuel tank 1. Only by attaching to 1, the fuel tank 1 is securely and firmly fixed to the sub tank 5 and the fuel tank 1.

In addition, in the above-described embodiment, the intermediate pipe 40 and the outer pipe 41 are interposed between the coil spring 50 and the fuel pump 9, and the fuel pump 9 is pressed downward via these pipes. Therefore, without providing a special member,
It is possible to press the fuel pump 9 using the fuel passage pipe having high rigidity, and it is possible to simultaneously press the fuel pump 9 and communicate the fuel supply pipe even when the device is assembled.

Further, in the above-described embodiment, since the fuel supply passage from the fuel pump 9 can be assembled only by inserting the fuel supply pipe 7 into the intermediate pipe 40, it is complicated and troublesome to connect the fuel pipe in a narrow sub tank. There is no need to do any work. Further, the fuel supply pipe 7 is inserted into one end of the intermediate pipe 40, the other end of the intermediate pipe 40 is inserted into the discharge port 10 of the fuel pump 9, and the lower portion of the fuel pump 9 is surrounded and supported by the cup-shaped cushion material 55. Since such a flexible connection and support structure as described above is adopted, it is possible to easily absorb the positional deviation of the fuel supply pipe 7 fixed to the cover 3 and the deviation due to the manufacturing error of each part.

Next, a third embodiment showing a modification of the second check valve will be described. In FIG. 4, a duck bill type check valve 13a similar to that of the first embodiment is used as the first check valve, and a ball valve 15 'which is slightly heavier than the specific gravity of gasoline is used as the second check valve. Reference numeral 12 denotes a jet pump, which is connected to a long suction pipe 26a outside the sub tank, and a filter 80 'is attached to the lower end of the suction pipe 26a. The sub-tank 5 is engaged with the cover 3 and has a fixed structure that cannot be expanded or contracted in the vertical direction.

Next, a third embodiment showing a modified example of the jet pump will be described. In the third embodiment, a flat fluid element type jet pump is used as the jet pump.

FIG. 5 is a partially sectional elevation view of the third embodiment, and FIG. 6 is an arrow VI.
7 is a partial cross-sectional side view seen from the direction of FIG. 7, FIG. 7 is a partial cross-sectional side view seen from the direction of arrow VII, FIG. 8 is a plan view of the cup-shaped member of the sub tank, and FIG. It is an IX sectional view.

5 to 9, the same or equivalent parts as in the first embodiment are designated by the same reference numerals.

In FIG. 5, the sub-tank 5 is composed of a bracket 20, a tubular member 21 and a cup-shaped member 22 as in the first embodiment, and the cup-shaped member 22 is made of a rubber-made coupling member 100 having a high elasticity. It is connected to the member 21. As shown in FIG. 8, the cup-shaped member 22 has a circular hole (opening) 101 and a fluid element-shaped groove 102 that forms the jet pump 12, as shown in FIG. The groove 102 is a recess formed on the bottom surface 22a of the cup-shaped member 22, and the head 103 in FIG. 8 receives the fuel sent through the fuel return pipe 11 and the intermediate pipe portion 104 in FIG. There is a nozzle portion 72 which is a portion and is next to the head portion 103. A negative pressure is formed in the arm-shaped portion 104 by the fuel ejected from the nozzle portion 72, and the fuel is sucked through the holes forming the left and right fuel suction ports 14, 14. The fuel suction ports 14 and 14 penetrate the bottom surface 22a of the cup-shaped member 22 together with the circular hole 101.

73 is a diffuser part, and the fuel discharge port 13
Exists. The fuel discharge port 13 is connected to the first check valve 13a via the pipe portion 105 as shown in FIG.

Next, in FIG. 5, a cover forming a fluid element-like jet pump is placed on the bottom surface of the cup-shaped member 22, and this cover 106 is the groove 102 of the jet pump 12 in FIG.
5 is partially covered and falls into a circular hole 101, and two through holes 6 are provided in the hole 101 as shown in FIG. The through hole 6 constitutes an intake port 6, and the intake port 6 is normally closed by an umbrella-shaped second check valve 15 made of rubber.

When fuel is put into the fuel tank, the second check valve 15 opens as in the first embodiment, and the cup-shaped member 22, that is, the sub-tank 5 inside the fuel tank, is opened through the intake port 6. And the fuel is sucked into the fuel pump 9 through the suction port 8 of the fuel pump 9 through the filter 56. Coupling member 12
Are integrally formed with cushion members 35, 36, 37, 38, which abut on the bottom surface 1b of the fuel tank 1 as shown in FIG. 7 as in the first embodiment.

When the fuel is sent from the fuel return pipe 11 into the jet pump 12, and the fuel is injected from the nozzle 72 through the head 103 in FIG. 8, the fuel is sucked into the groove 102 from the fuel suction port 14 and discharged. Outlet 13, pipe section 105 and first check valve 1 in FIG.
It is put into the sub tank via 3a and the liquid level in the sub tank 5 is raised.

The sub tank 5 is composed of a metal bracket 20 fixed to the cover 3, and synthetic resin sub tank main bodies 21 and 22 connected to the bracket 20. The sub tank main body 21 and 22 are provided on the bracket 20 side. Is integrally formed with at least a pair of engaging projections 30 (FIG. 7). The bracket 20 and the sub tank main bodies 21, 22 are connected to each other so that the sub tank main bodies 21, 22 can slide in the longitudinal direction of the sub tank main bodies 21, 22 with respect to the bracket 20. And the hook part provided at the tip of the bracket 20
By the engagement of 20a and the protrusion 30 of the sub-tank body 21, 22,
The bracket 20 and the sub tank main bodies 21 and 22 are prevented from being separated from each other after assembling. Further, as shown in FIG. 7, the cushion members 35, 3 assembled on the sub tank main body 21, 22 side between the bottom wall 5a of the sub tank main body 21, 22 and the bottom surface 1b of the fuel tank 1.
6, 37, 38 are formed integrally with the connecting member 100.

Further, the coil spring 50 is disposed between the sub tank main bodies 21 and 22 and the cover 3, and the elastic pressing force of the coil spring 50 is applied to the cover 3 side and the sub tank in the direction of moving the sub tank main bodies 21 and 22 away from the cover 3. It acts on the main body 21, 22 side. That is, as shown in FIG. 6, the coil spring 50 includes the cover 3 and the cylinder 50 for holding the spring.
Cylinder 50a is placed between a and cap member 5c
Is provided on the upper surface of. The cap member 5c is a component of the sub-tank 5, is fitted to the upper end surface of the tubular member 21, and discharges fuel from the fuel supply pipe 7 to the discharge port 10 of the fuel pump 9.
It integrally has an intermediate pipe 40 that guides the fuel return pipe 11 and an intermediate pipe portion 104 that receives the fuel return pipe 11.

Then, in this third embodiment, the jet pump 12
Is formed in a planar shape and is provided on the lower side of the fuel pump 9, it is possible to reduce the head of the jet pump 12 from the lower portion of the fuel suction port 14 to the nozzle portion 72. Since the fuel can be easily transferred from the outside of the sub tank 5 to the inside of the sub tank 5, the jet pump 12 can be downsized or its capacity can be improved. Further, like the fluid element, the groove 102 having a concave shape and the cover 10 covering the groove 102 are provided.
Since the jet pump 12 is formed from 6, the number of parts can be reduced.

Note that the fuel tank is omitted in FIGS. 5 and 6.

[Brief description of drawings]

FIG. 1 is a partially sectional elevational view in a fuel tank showing a first embodiment of the device of the present invention, and FIG. 2 is a partially sectional elevational view of only a sub tank and a fuel pump portion viewed from the direction of arrow II in FIG. 3 and 4 are elevation views similar to FIG. 1 showing a state where the fuel liquid surface is inclined, FIG. 4 is a partially sectional elevation view showing the second embodiment, and FIG. 5 is the device of the present invention. FIG. 6 is a partial cross-sectional side view seen from the direction of arrow VI, FIG. 7 is a partial cross-sectional side view seen from the direction of arrow VII, and FIG. FIG. 9 is a plan view of the cup-shaped member of the sub tank used in the third embodiment, and FIG. 9 is a sectional view taken along the line IX-IX in FIG. 1 ... Fuel tank, 1a ... Ceiling, 1b ... Bottom, 1c ... Side, 2 ... Opening, 3 ... Cover, 4 ... Packing, 5 ... Sub tank, 5a ... Bottom wall, 6 …… Intake, 7 …… Fuel supply pipe,
7a ... Bulging part, 7b ... bottom end, 8 ... intake port, 9 ... fuel pump, 10 ... discharge port, 11 ... fuel return pipe, 12 ... jet pump, 13 ... fuel discharge port, 13a …… First check valve, 14 ……
Fuel inlet, 15,15 '…… Second check valve, 20 …… Bracket,
20a …… hook part, 21 …… cylindrical member, 22 …… cup member,
25 …… Pipe-shaped body, 26 …… Branched pipe, 30 …… Projection, 35〜38 …… Cushion member, 50 …… Coil spring, 55 …… Cup cushion material, 56 …… Filter, 81, 82
...... Fuel level, 102 ...... Groove forming fluid element.

Claims (7)

[Claims] 1. A fuel tank (1) having a ceiling surface and a bottom surface facing the ceiling surface, the opening portion being formed in the ceiling surface, and storing a fuel; and the opening portion of the fuel tank. A cover (3) that is provided and covers the opening, and that is provided in the fuel tank while being supported by the cover and in contact with the bottom surface, and expands and contracts according to the distance between the cover and the bottom surface; A sub-tank (5) for storing fuel therein; a fuel supply pipe (7) hanging from the cover toward the inside of the fuel tank for supplying the fuel in the fuel tank to the outside; A fuel pump (9) provided in the sub tank and connected to the fuel supply pipe for supplying the fuel in the fuel tank to the outside.
And an intake port (6) formed below the sub-tank for introducing the fuel in the fuel tank to the intake port of the fuel pump.
The fuel tank is provided at the intake port, and when the fuel liquid level in the fuel tank is lower than the intake port, the intake port is closed to stop the fuel introduction from the fuel tank to the intake port of the fuel pump, A valve (15) that supplies fuel to the suction port of the fuel pump only from inside the sub tank, and a fuel that is hung from the cover toward the inside of the sub tank inside the fuel tank and that is supplied to the outside through the fuel supply pipe. A fuel return pipe (11) for returning to the inside of the sub tank, and provided between the cover and the fuel pump, expands and contracts according to the distance between the cover and the fuel pump, and directs the fuel pump into the sub tank. And a pressing means (50) for pressing the sub-tank toward the bottom surface of the fuel tank via the fuel pump. Fuel supply device. 2. The fuel supply pipe is supported by the cover and is provided coaxially with the first pipe, the first pipe being hung from the cover toward the inside of the fuel tank. A second pipe, one end of which is in contact with the fuel pump and communicates with the discharge port of the fuel pump, and the other end of which is movably connected to the first pipe in the axial direction thereof and communicates with the first pipe ( 40, 41) and the fuel supply device according to claim 1. 3. The pressing member is provided on an outer circumference of the fuel supply pipe, is interposed between the cover and the connection pipe, and presses and biases the connection pipe toward the fuel pump, The fuel supply device according to claim 2, further comprising a coil spring (50) for pressing the fuel pump into the sub-tank via a connection pipe. 4. The fuel supply device according to claim 3, wherein a spring receiver (7a) for receiving one end of the coil spring is formed on an outer periphery of the fuel supply pipe. 5. The sub-tank includes a cylindrical bracket fixed to the cover, and a sub-tank main body that is movably supported in the axial direction with respect to the bracket and stores fuel therein. The attachment to the opening allows the cover to move axially in accordance with the distance between the cover and the bottom surface of the fuel tank, expands and contracts, and abuts on the bottom surface. Fuel supply device. 6. The sub-tank, which is formed on an inner surface of the sub-tank and which supports the fuel pump, and a cushion member which is provided between the fuel pump and the support part and which suppresses transmission of vibration. The fuel supply device according to claim 1, further comprising: a fuel pump, wherein the fuel pump is pressed into the sub tank by the pressing means via the cushion material. 7. The fuel supply according to claim 1, wherein the sub-tank is provided with a cushion material (35, 36, 37, 38) at a portion in contact with the bottom surface of the fuel tank. apparatus.