JP2001082276A - Fuel feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent vapor in a pump chamber discharged from a vapor discharge passage from being re-sucked into the pump chamber by disposing the longitudinal axial line of a fuel pump disposed in a sub-tank in a horizontal direction. SOLUTION: The longitudinal axial line X-X of the fuel pump P is disposed horizontally in the sub-tank S, which is disposed in a main tank T. A suction passage 4 linking with a pump part PA and a vapor discharge hole 3 linking with the pump part PA are open on one side PG of the fuel pump P. A filter F linking with the suction path 4 is disposed along the longitudinal axial line X-X of the fuel pump P by a lower space J in the gravity direction of the fuel pump P. The vapor discharge hole 3 is open at a position above the longitudinal axial line X-X of the fuel pump P through a vapor discharge passage 6 formed at a grommet 5 fitted on one side PG of the fuel pump P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank in which a fuel pump is arranged in a sub-tank and a sub-tank including the fuel pump is accommodated in a main tank. The present invention relates to a supplied fuel supply device.

[0002]

2. Description of the Related Art A conventional fuel supply system is shown in FIG.
According to this, the bottomed cup-shaped sub-tank S is arranged in the main tank T via the opening TA of the main tank T, and its longitudinal axis XX is vertically arranged in the sub-tank S. The fuel pump P is housed. The fuel pump P has a pump section PA formed below and a motor section M above which rotates the pump section PA.
The pump section PA includes a pump casing PC and a pump cover PD forming a pump chamber PB, and an impeller PE rotatably disposed in the pump chamber PB and rotated by a motor section M. Further, a vapor discharge path 1 for discharging vapor generated in the pump chamber PB to the outside is opened on the lower side face PF of the fuel pump, and a suction path 2 connected to the pump chamber PB is opened.
A filter F is connected to the suction passage 2. The fuel in the main tank T is supplied into the sub-tank S by an opening (not shown) and a jet pump, and the pump unit PA is driven through the filter F and the suction passage 2 by driving the fuel pump P. The fuel is sucked into the pump chamber PB and pressurized, and the pressurized fuel is supplied to a fuel injection valve (not shown) via the discharge path 3. On the other hand, the pump room PB
The vapor generated inside is discharged into the sub tank S via the vapor discharge path 1.

[0003]

According to the conventional fuel supply apparatus, the vapor in the pump chamber PB discharged from the vapor discharge path 1 is sucked into the pump chamber PB again through the filter F and the suction path 2. This is likely to hinder the fuel discharge characteristics. As described above, the filter F including the opening of the vapor discharge passage 1 and the suction passage 2 is arranged near the lower surface PF of the fuel pump P,
The vapor jet discharged from the vapor discharge path 1 easily acts on the filter F. And that the vapor discharge path 1 is discharged into the narrow sub tank S in an unlimited state. Is considered to be the main cause.

On the other hand, in recent years, the height of the main tank T has been reduced for the purpose of increasing the degree of freedom in designing a vehicle. In order to achieve this, the longitudinal axis XX of the fuel pump must be reduced. Placement in the horizontal direction in the sub tank is performed.

In view of the above, the present invention provides a fuel supply device in which the longitudinal axis of a fuel pump in a sub-tank is arranged in a horizontal direction, the sub-tank is accommodated in a main tank, and the fuel is discharged from a vapor discharge passage. The filter in which the vapor in the pump chamber is placed in the sub tank,
An object of the present invention is to provide a fuel supply device having excellent fuel discharge characteristics without being sucked into the pump chamber again through the suction passage.

[0006]

In order to achieve the above object, a fuel supply device according to the present invention has a longitudinal axis XX of a fuel pump disposed horizontally in a sub-tank, and the sub-tank is located in a main tank. In the fuel supply device, the suction passage connected to the pump unit on one side of the fuel pump, and a vapor discharge hole connected to the pump unit are opened, and the filter connected to the suction passage is connected to the fuel pump in the gravity direction. The lower space is disposed along the longitudinal axis XX of the fuel pump, and a vapor discharge hole is formed through a vapor discharge passage formed in a grommet fitted to one side of the fuel pump. The first feature is that the opening is provided above the core line XX.

In a second aspect of the present invention, in addition to the first aspect, the vapor discharge path formed in the grommet is formed linearly and the vapor discharge path is arranged vertically. .

[0008]

According to the first feature of the present invention, the filter connected to the suction passage is located in the space below the fuel pump along the longitudinal axis of the fuel pump, and the vapor discharge passage is connected to the longitudinal axis of the fuel pump. Because it opens above the core wire,
It is possible to effectively prevent the vapor in the pump chamber discharged from the vapor discharge passage from being sucked into the pump chamber again through the filter, and to provide a fuel supply device horizontally disposed with the fuel pump having the above-described operation.

According to a second feature of the present invention, since the vapor discharge passage is formed in a grommet and is provided in a straight line and in a vertical direction, the vapor jet of the vapor can be directed accurately upward. It can be discharged and the entry of vapor into the filter can be further suppressed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the fuel supply device of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part of a fuel pump including a filter. FIG. 2 is a left side view of a main part of FIG. And
FIG. 1 corresponds to a vertical cross-sectional view of an essential part taken along line YY in FIG. P is a fuel pump having a pump section PA formed on one side (the left side in FIG. 3) and a motor section M for rotating the pump section PA on the other side B (the right side in FIG. 3).
Is provided. The pump section PA is formed by a pump casing PC and a pump cover PD forming a pump chamber PB, and an impeller PE rotatably arranged in the pump chamber PB. The impeller PE has a motor section M.
Of the motor portion M is transmitted to the impeller PE. And one side PG of the fuel pump P
In FIG. 1, a vapor discharge hole 3 and a suction passage 4 are opened at the left side of the pump cover PD.

Here, the upstream side of the vapor discharge hole 3 opens into the pump chamber PB, and the downstream side opens to one side PG of the fuel pump P. At this time, it is desirable that the position of the opening of the vapor discharge hole 3 to one side PG be higher than the longitudinal axis XX of the fuel pump P in the direction of gravity. In addition, the suction passage 4 opens slightly upstream from the one side PG of the fuel pump P, and opens downstream into the pump chamber PB. At this time, the opening position of the suction passage 4 to one side PG is desirably a position below the longitudinal axis XX of the fuel pump P in the direction of gravity.

A thin cup-shaped grommet 5 made of an elastic material such as a rubber material is fitted on the outer periphery of one side PG of the fuel pump P (in other words, the outer periphery of the pump cover PD). More specifically, the outer peripheral surface and the left side surface of the pump cover PD are covered with the grommet 5. The grommet 5 is formed with a vapor discharge passage 6 facing the vapor discharge hole 3, and the open end 6A of the vapor discharge passage 6 is located above the longitudinal axis XX of the fuel pump P in the direction of gravity. Open in position. That is, the vapor discharge hole 3 opens to the outside via the open end 6A of the vapor discharge passage 6.

On the other hand, the filter F is located in the lower space J below the bottom PH of the fuel pump P in the direction of gravity and along the longitudinal axis XX of the fuel pump P. The filter F and the suction passage 4 are connected by a connection pipe 7.

As described above, the grommet 5 is attached to the fuel pump P.
The fuel pump P is fixedly disposed in a sub-tank S. The sub-tank S has a cap C for closing an opening TA of the main tank T.
Is supported via a connecting rod 8. A discharge path 9 extending from the other end of the fuel pump P is connected to a discharge path 10 of the cap C via a connection pipe 11. This is best illustrated in FIG.

According to the above, the longitudinal axis XX of the fuel pump P is located in the sub tank S and is arranged in the horizontal direction. Here, when the motor section M of the fuel pump P is energized and the motor section M rotates, the impeller PE rotates in the pump chamber PB in synchronization with the output rod MA. Foreign matter is removed from the fuel in the sub-tank S supplied to the pump chamber PB via the suction passage 4 by the filter F.
The fuel is pressurized by being sucked into the inside, and the pressurized fuel is supplied to a fuel injection valve (not shown) through a discharge path 9, a connection pipe 11, and a discharge path 10. On the other hand, the impeller P
The vapor in the pump chamber generated by the rotation of E is injected into the vapor discharge passage 6 from the vapor discharge hole 3 together with the fuel having the pressure, and is discharged together with the jet from the open end 6A of the vapor discharge passage 6 into the sub tank S. .

[0016]

According to the fuel supply apparatus of the present invention, the vapor discharged from the vapor discharge hole 3 is restricted in its jet by the vapor discharge passage 6, and is directed outward from the upper open end 6A. Is discharged. According to the above, the vapor is in the sub tank S and the fuel pump P
Is restricted only upward from the longitudinal axis XX of the nozzle. On the other hand, the filter F to which fuel is supplied toward the suction passage 4 is disposed in a lower space J located below the bottom PH of the fuel pump P. According to the above, the relative position between the opening end 6A of the vapor discharge passage 6 and the filter F can be made sufficiently large in the narrow sub-tank S in the direction of gravity. And that the vapor is directed upward from the open end 6A of the vapor discharge path 6 and is ejected. The vapor discharged from the sub-tank S into the sub-tank S is not sucked into the filter F again, so that the fuel pressure in the pump chamber PB can be favorably increased and excellent fuel discharge characteristics can be obtained. .

In addition, since the vapor discharge passage 6 formed in the grommet is formed linearly and arranged vertically, the fuel flow including the vapor flowing in the vapor discharge passage 6 can be directed upward smoothly. The above effect can be further improved.

Further, since the filter F is disposed in the space J below the fuel pump P and along the longitudinal axis XX of the fuel pump P, a large filtering area of the filter F can be ensured, and It is possible to effectively prevent vapor from entering the filter. Preventing the vapor from flowing back into the pump chamber PB is particularly effective in a type in which the fuel pump P is housed in the sub-tank S having a very small volume.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a fuel pump having a filter in a fuel supply device of the present invention.

FIG. 2 is a left side view of a main part of FIG.

FIG. 3 is a longitudinal sectional view of a main part showing a state where a sub tank is housed in a main tank.

FIG. 4 is a longitudinal sectional view showing a conventional fuel supply device.

Claims (2)

[Claims] 1. A fuel supply device in which a longitudinal axis XX of a fuel pump is horizontally arranged in a sub tank and the sub tank is arranged in a main tank. The suction passage 4 connected to the PA and the vapor discharge hole 3 connected to the pump unit PA are open, and the filter F connected to the suction passage is connected to the longitudinal axis of the fuel pump P by the lower space J in the gravity direction of the fuel pump P. Along the line XX, the vapor discharge hole 3 is formed through a vapor discharge passage 6 formed in a grommet 5 fitted to one side PG of the fuel pump P. -A fuel supply device characterized by having an opening above X. 2. A vapor discharge path 6 formed in the grommet is formed in a straight line, and the vapor discharge path 6 is formed.
A fuel supply device, wherein the fuel supply device is disposed in a vertical direction.