JPH0882263A - In-take type fuel pump device - Google Patents

Abstract

PURPOSE: To support and fix a relief valve for regulating the discharge pressure of a fuel pump on the fuel pump side. CONSTITUTION: A cylindrical fitting frame part 20 formed integrally with a relief valve case 6 by resin is fitted to the outer wall of an electric connector housing 4 of the pump side, and an engaging projection 51 of the relief valve side is elastically fitted to the fitting end part 52 of the pump side, so that after fitting, the relief valve case 6 is locked on a fuel pump 3 in the axial direction and in the rotating direction. Thus, it is possible to prevent the interference of a relief valve unit 5 with the other parts caused by pump vibration and tank vibration. Furthermore, it is possible to support and fix the relief valve unit 5 on the pump side without a change in design of the fuel pump side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-tank type fuel pump device, and more particularly to a device for supporting a relief valve of a fuel pump housed in a fuel tank.

[0002]

2. Description of the Related Art In a fuel supply system for an internal combustion engine for a vehicle, fuel drawn from a fuel pump provided in a fuel tank is injected and supplied from a fuel injection valve of a fuel injection device to a combustion chamber of the internal combustion engine. Things are known.
Part of the fuel pumped up from the fuel pump is supplied to the fuel injection valve, and surplus fuel not supplied to the fuel injection valve is
It is returned to the fuel tank via the relief valve of the pressure regulator. By doing so, the pressure of the fuel acting on the fuel injection valve is maintained at a constant pressure, and the fuel injection amount is appropriately controlled. Further, a technique has been devised in which a pressure regulator or a relief valve is arranged in a tank and excess fuel is directly returned to the tank.

[0003]

In such a conventional in-tank type fuel pump device, it is desirable to propose a method of fixing the pressure regulator or the relief valve inside the fuel tank. It is rare. The in-tank fuel pump device that does not have the fixing means for supporting and fixing the relief valve is liable to swing in the up-down direction or the rotation direction, so that the relief valve may be affected by the vibration from the fuel tank or the pump body. Interfering with the parts, pump vibrations are transmitted to the tank and cause noise.

An object of the present invention is to provide an in-tank type fuel pump device in which a relief valve for regulating the pressure of fuel discharged from the fuel pump is supported and fixed to the fuel pump. Another object of the present invention is to provide a relief valve fixing device that can be easily assembled and installed in a tank of an in-tank fuel pump device.

[0005]

In order to solve the above problems, an in-tank fuel pump device according to claim 1 of the present invention is a relief mounted on the discharge side of a fuel pump arranged in a fuel tank. An in-tank fuel pump device in which a valve is arranged in the fuel tank, wherein a part of a valve case of the relief valve is in contact with a pump member of the fuel pump.

According to another aspect of the present invention, there is provided an in-tank fuel pump device, wherein a part of a valve case of the relief valve is in contact with an electric connector housing of the fuel pump. In the in-tank fuel pump device according to claim 3, a part of the valve case of the relief valve is in contact with a lead wire terminal for supplying a power supply current to the pump portion and a nut for tightening the lead wire terminal. Is characterized by.

An in-tank type fuel pump device according to a fourth aspect is an in-tank type fuel pump device having a relief valve in a fuel tank, the pump case, a suction pipe, a discharge pipe, and an electric connector housing. A fuel pump body having a locking portion provided in the electric connector housing, an inlet pipe portion having an internal space, and a discharge pipe portion having a communication hole communicating with the internal space,
An open pipe part having a communication hole communicating with the internal space and accommodating a valve member therein, a mounting member connected to the inlet pipe part, and an elastic locking provided on the locking part and provided on the mounting member. And a relief valve case having a lockable portion.

An in-tank type fuel pump device according to a fifth aspect is an in-tank type fuel pump device having a relief valve in a fuel tank, the pump case, a suction pipe, a discharge pipe, and an electric connector screw terminal. A fuel pump main body having an internal space, an inlet pipe section having an internal space, a discharge pipe section having a communication hole communicating with the internal space, and a communication hole communicating with the internal space, and a valve member is housed inside. Relief valve case having an open pipe part and a mounting member mechanically connected to the inlet pipe part, an external lead wire terminal electrically connectable to the electric connector screw terminal, and the mounting member It is characterized by having a nut that can be fixed.

[0009]

According to the in-tank fuel pump device of the present invention, since a part of the valve case of the relief valve is in contact with the pump member, the relief valve unit interferes with other parts due to pump vibration and tank vibration. Can be prevented. Further, the relief valve unit can be supported and fixed without changing the design on the fuel pump side.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. (First Embodiment) An embodiment of the in-tank fuel pump device of the present invention is shown in FIGS. FIG. 1 is a sectional view showing a state where a relief valve of an in-tank fuel pump device is attached,
FIG. 2 is a view taken in the direction of arrow II in FIG. 1 showing a state of the fuel pump having the relief valve attached thereto before the external electric connector is attached.

As shown in FIG. 1, a fuel pump 3 and a relief valve unit 5 are arranged inside a fuel tank 1.
In the relief valve case 6 of the relief valve unit 5, the inlet pipe portion 14 formed at one end is fitted to the outer wall of the pump side discharge pipe 4 of the fuel pump 3, and the discharge pipe formed at the other end. The portion 18 is fitted to the inner wall of the bottomed tubular supporter 11. The supporter 11 is the fuel tank 1
It has a discharge pipe 9 which is fitted into a circular hole 27 formed in the flange 2 of the above and leads out fuel to the internal combustion engine side not shown.

The relief valve case 6 of the relief valve unit 5 includes an inlet pipe portion 14, an intermediate shoulder portion 15, and an outlet connecting portion 1.
6, outlet shoulder 17, discharge pipe 18, open pipe 1
9 and the mounting frame portion 20, and these constituent elements are integrally formed by resin molding. Hereinafter, these components will be described in detail in order. The inlet pipe portion 14 has a large-diameter cylindrical shape and is fitted to the outer wall of the pump-side discharge pipe 4 of the fuel pump 3 via an O-ring 22. The O-ring 22 is a cylindrical spacer 2 fitted to the outer peripheral portion of the pump side discharge pipe 4.
4 and a cap 25 with a hole that is fitted to the end of the pump-side discharge pipe 4 are fitted to the outer peripheral portion of the discharge pipe.

The intermediate shoulder portion 15 is a portion for connecting the inlet pipe portion 14 and the outlet connecting portion 16 having an outer diameter smaller than the outer diameter of the inlet pipe portion 14, and the inside of the inlet pipe portion 14 is located at the center. It has a communication hole 26 that communicates with the inside of the outlet connection part 16. The outlet connecting portion 16 is a portion that is inserted into a circular hole 27 formed in the flange 2 of the fuel tank 1 and that is formed into a small-diameter cylindrical shape having a space portion 28 inside. A check valve 29 is accommodated in the space 28, and a valve seat 30 of the check valve 29 is formed inside the outlet connecting portion 16. This check valve 29 is pushed up from the valve seat 30 by the pressure of the fluid acting on the communication hole 26 to be in an open state. When the fuel pump is stopped, it is pushed by the valve seat due to the pressure in the pipe,
Keep the residual pressure in the piping.

The outlet shoulder portion 17 is a portion for connecting the outlet connecting portion 16 and a discharge pipe 18 having an outer diameter smaller than the outer diameter of the outlet connecting portion 16, and is fitted to the outer peripheral portion of the discharge pipe portion 18. The O-ring 31 is in contact. An O-ring 31 is fitted on the outer peripheral portion of the discharge pipe portion 18, and the O-ring 31 is tightly fitted to the inner wall of the supporter 11 in a liquid-tight manner. An O-ring 31 is provided at the end of the discharge pipe section 18.
A cap 32 for preventing the slip-out is fitted. Inside the discharge pipe portion 18, a stopper 33 that regulates the amount of axial movement of the check valve 29 is fitted to the inner wall.

The open pipe portion 19 is, as shown in FIG.
It is formed so as to extend from an outer wall of the inlet pipe portion 14 of the relief valve case 6 in a cylindrical shape in a direction orthogonal to the inlet pipe axis. One end 19a of the open pipe portion 19 is integrally connected to the outer wall of the inlet pipe portion 14, and a communication hole 36 communicating with the internal space 34 of the inlet pipe portion 14 is formed inside the open pipe portion 19. ing. Open pipe part 19
A relief valve 38 as a valve member is housed inside the valve, and the relief valve 38 opens when the pressure in the internal space 34 becomes a predetermined value or higher, and the relief valve 38 is a surplus as a part of the fuel in the internal space 34. Return the fuel to the fuel tank through a pipe not shown.

The mounting frame portion 20 is a portion for supporting and fixing the relief valve case 6 to the fuel pump 3, and is formed integrally with the inlet pipe portion 14. The mounting frame portion 20 is a portion that is fitted to an outer peripheral portion of an electric connector housing 44 that accommodates the electric terminals 41 and 42 of the fuel pump 3 therein. The electrical connector housing 44 includes the electrical terminals 41, 4
2 is formed in a frame shape so as to surround 2 and has a space portion, and the mounting frame portion 20 is fitted to the outer wall of the frame portion.
The shape and size of the inner wall of the are specified.

The electrical connector housing 44 is formed in a rectangular tubular shape, and as shown in FIG.
An elongated slot 46 for fitting extending in the axial direction is formed on the side wall opposite to the side wall. FIG. 1 shows a state in which the mounting frame portion 20 is fitted to the outer wall of the electric connector housing 44. In the portion of the mounting frame portion 20 opposite to the inlet pipe portion 14, a slit 48 having a cutout groove shape corresponding to the position of the elongated slot 46 for fitting,
49 is formed, the fitting elastic columnar portion 50 extends in the axial direction between the slit 48 and the slit 49, and the fitting elastic columnar portion 50 is formed on the upper end of the fitting elastic columnar portion 50 so as to be convex toward the inner wall. The fitting elastic projection 51 is formed so as to be fitted to the end portion 52 of the fitting long hole 46. In the state shown in FIG. 1, the fitting projection 51 of the mounting frame portion 20 is fitted in the fitting long hole 46 of the electric connector housing 44, but this fitting elastic column portion 50 has its lower end. The fitting projection 51 is bent in the right and left directions in FIG. 1 by being supported by the root portion on the side. In the state shown in FIG. 1, the fitting projection 51 has the end portion 54.
Abutting against and elastically fitted. Therefore, in the state shown in FIG. 1, when removing the relief valve case 6 from the electric connector housing 44, the fitting of the fitting elastic column portion 50 from the fitting elongated hole 46 is released, and the fitting from the electric connector housing 44 to the bearing portion is performed. The frame 20 can be pulled out and the relief valve unit 5 can be removed from the electrical connector housing 44.

In the state shown in FIG. 1, the external electrical connector 5
By fitting 4 into the electric connector housing 44, the electric terminals 41 and 42 inside the electric connector housing 44 are electrically connected to an external electric terminal (not shown). When a current is supplied to the fuel pump 3 from the external electric connector 54 via the electric terminals 41 and 42, the pump portion of the fuel pump 3 is driven.

According to this embodiment, the external electrical connector 54
The snap fit type convex portion 56 is hooked on the fitting long hole 46 to prevent the fitting from coming off. Since the fitting projection 51 of the fitting elastic column portion 50 of the mounting frame portion 20 is locked to the fitting end portion 52 of the relief valve unit 5, the relief valve unit 5 is prevented from rotating and is prevented from coming off. 5 has an effect that it does not easily come off from the fuel pump 3.

Further, according to this embodiment, the fuel discharged from the pump side discharge pipe 4 of the fuel pump 3 is stored in the internal space 3
4, supporter 1 via communication hole 26 and internal space 28
It is supplied from the discharge pipe 9 to the fuel injection valve on the internal combustion engine side through the first internal space 55. At this time, when the pressure of the fuel in the internal space 34 of the relief valve case 6 becomes a certain value or more, the relief valve 3 accommodated in the open pipe portion 19
When the valve 8 is opened, the excess fuel, which is a part of the fuel in the internal space 34, is discharged from the open pipe portion 19 through the relief valve 38 and returned to the fuel tank 1.

At the time of assembly, when the relief valve unit 5 is assembled to the fuel pump 3, the mounting frame portion 20 is fitted so as to surround the outer wall portion of the electric connector housing 44, so that the fuel pump 3 of the relief valve case 6 is fitted. The direction to prevent rotation is determined, which has the effect of preventing incorrect assembly and becoming a rotation stop. Further, at the time of this assembly, since the fitting projection 51 engages with the fitting end portion 52 of the electric connector housing 44, the relief valve case 6 is locked to the fuel pump 3 in the axial direction, that is, in the vertical direction in FIG. Become.

The relief valve unit 5 is supported and fixed to the front and rear of the fuel pump 3 by the action of the above-mentioned detent and locking. Therefore, it is possible to prevent the relief valve unit 5 from interfering with other parts when vibrations of the internal combustion engine, pump vibrations, tank vibrations, and the like accompanying the vehicle traveling vibrations are occurring. Moreover, since the relief valve unit 5 is supported and fixed by utilizing the electrical connector structure portion of the fuel pump 3, only the shape and structure of the relief valve unit 5 side can be changed without changing the structure of the fuel pump 3 side. Since it is possible to fix the relief valve, it is possible to provide the relief valve fixing device at low cost.

(Second Embodiment) Next, a second embodiment of the present invention is shown in FIG. 4, components that are substantially the same as the components in FIG. 1 are assigned the same reference numerals and explanations thereof are omitted. The second embodiment is an example in which a mounting projection protruding outside the relief valve case is provided, and the mounting projection together with the lead wire terminal is fastened and fixed to the fuel pump with a nut.

As shown in FIG. 4, a mounting projection 61 projects outward from the outer wall of the inlet pipe portion 14 of the relief valve case 6 in a direction perpendicular to the pipe axis. The mounting protrusion 61 has an insertion hole 63 into which the screw 64 can be inserted while maintaining a play state. An electric connector base 65 is formed on the fuel pump 3 side, and an electric connector screw terminal 64 on the pump side projects from the upper surface of the base 65. The terminal 67 of the external lead wire 66 is placed on the upper surface of the base 65, and the electric connector screw terminal 64 is inserted through the hole of the terminal 67. Then, the mounting projection 61 is placed on the upper surface of the terminal 67, and the nut 68 is tightened to the electric connector screw terminal 64 projecting on the upper surface of the mounting projection 61. 67
The mounting projection 61 and the mounting projection 61 are fastened and fixed by a nut 68. The mounting protrusion 61 is made of an electrically insulating resin.

According to the second embodiment, since the mounting projection 61 of the relief valve case 6 is inserted into the electric connector screw terminal 64 and fixed by the nut 68, the relief valve unit is attached to the fuel pump 3. The detent 5 and the axial stop are surely secured. Further, according to the second embodiment, the step of electrically connecting the external lead wire 66 for electrically connecting the fuel pump 3 and the step of attaching the relief valve unit 5 for the fuel pump are simultaneously performed by tightening and fixing one nut 68. Therefore, there is an effect that the assembly work process is simplified.

[Brief description of drawings]

FIG. 1 is a sectional view of a relief valve mounting portion of an in-tank fuel pump device according to a first embodiment of the present invention.

2 is a plan view of the in-tank fuel pump device shown in FIG. 1 with the supporter and the external electrical connector removed, as viewed in the direction of arrow II in FIG.

FIG. 3 is a side view showing a state before the relief valve unit is attached to the electric connector housing of the fuel pump.

FIG. 4 is a sectional view of a relief valve mounting portion of an in-tank fuel pump device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Fuel Tank 2 Flange 3 Fuel Pump (Pump Case, Fuel Pump Main Body) 4 Discharge Pipe 5 Relief Valve Unit 6 Relief Valve Case (Valve Case) 9 Discharge Pipe 11 Supporter 14 Inlet Pipe 15 Intermediate Shoulder 16 Outlet Connection 17 Outlet Shoulder part 18 Discharge pipe part 19 Open pipe part 20 Mounting frame part 29 Check valve 34 Internal space 36 Communication hole 38 Relief valve (valve member) 41, 42 Electric terminal 44 Electric connector housing (pump member) 46 Long hole for fitting ( Locking part) 48, 49 Slit (locking part) 50 Elastic column part for fitting (locked part) 51 Protrusion for fitting (locked part) 52 Protrusion for fitting (locking part) 54 External electrical connector 55 Inside Space 61 Projection for mounting (part of valve case) 64 Electric connector screw terminal 65 Base 66 Lead wire 67 Terminal (Lead wire terminal) 68 Nut

Claims (5)

[Claims] 1. An in-tank fuel pump in which a relief valve mounted on the discharge side of a fuel pump arranged in a fuel tank is arranged in the fuel tank, wherein a part of a valve case of the relief valve is a fuel pump. The in-tank fuel pump device, which is in contact with the pump member. 2. The pump member is an electrical connector housing of the fuel pump.
The in-tank fuel pump device described. 3. The in-tank fuel pump device according to claim 1, wherein the pump member is a lead wire terminal for supplying a power supply current to the pump portion and a nut for tightening the lead wire terminal. 4. An in-tank fuel pump device having a relief valve in a fuel tank, the pump case, a suction pipe, a discharge pipe, an electrical connector housing, and a locking portion provided in the electrical connector housing. A fuel pump main body having an internal space, an inlet pipe part having an internal space, a discharge pipe part having a communication hole communicating with the internal space, and a communication hole communicating with the internal space, and a valve member is housed inside. A relief valve case having an open pipe portion, a mounting member connected to the inlet pipe portion, and a locked portion that is provided on the mounting member and that can be elastically locked to the locking portion. In-tank fuel pump device characterized by. 5. An in-tank fuel pump device having a relief valve in a fuel tank, comprising a pump case, a suction pipe, a discharge pipe, a fuel pump main body having an electric connector screw terminal, and an internal space. An inlet pipe portion having, a discharge pipe portion having a communication hole communicating with the internal space, an open pipe portion having a communication hole communicating with the internal space and accommodating a valve member therein, and a machine for the inlet pipe portion. A relief valve case having a mounting member that is electrically connected, an external lead wire terminal that can be electrically connected to the electrical connector screw terminal, and a nut that can fix the mounting member by tightening. In-tank fuel pump device.