JPH1047185A - Fuel supplying device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent vibration of the case and reduce vehicle noise which are caused by the discharge pressure of the excessive fuel discharged from the pressure regulator and its pressure pulsation. SOLUTION: The captioned device comprises a case 1 provided in a fuel tank 6 and a pressure regulator 4 which is housed in the case 1 and regulates the fuel pressure in a fuel supplying line 13 which supplies fuel to the internal combustion engine. The pressure regulator 4 has a fuel discharge pipe 39 which exhausts the excessive flue which is produced when the fuel pressure is regulated. On the case 1 is provided an insertion hole 46 into which the fuel discharge pipe 39 is inserted. Since the exit end of the fuel discharge pipe inserted in the insertion hole 46 of the case 1 is situated outside the case 1, the excessive fuel which is produced when the fuel pressure is regulated is exhausted outside the case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for an internal combustion engine in an automobile.

[0002]

2. Description of the Related Art Conventionally, a fuel supply device for an internal combustion engine includes a case provided in a fuel tank and a pressure regulator housed in the case and adjusting a fuel pressure of a fuel supply line to the internal combustion engine. (For example, see Japanese Patent Application Laid-Open No. 7-63133). In such a fuel supply device, surplus fuel accompanying the adjustment of the fuel pressure of the pressure regulator is discharged (also referred to as discharge) into the case.

[0003]

As described above, when the excess fuel is discharged into the case, the case vibrates due to the discharge pressure of the excess fuel discharged from the pressure regulator and the pressure pulsation, and the vibration is caused by the fuel vibration. Since the noise is transmitted to the vehicle interior through the tank, the vehicle noise is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the problem to be solved by the present invention is due to the discharge pressure of surplus fuel discharged from the pressure regulator and its pressure pulsation. An object of the present invention is to provide a fuel supply device for an internal combustion engine that can prevent vibration of a case and reduce vehicle noise.

[0005]

According to a first aspect of the present invention, there is provided a fuel tank comprising: a case provided in a fuel tank; and a pressure housed in the case and adjusting a fuel pressure of a fuel supply line to an internal combustion engine. A fuel supply device for an internal combustion engine including a regulator, wherein the pressure regulator has a fuel discharge pipe for discharging excess fuel due to fuel pressure adjustment, and an insertion hole for inserting the fuel discharge pipe into the case. Is a fuel supply device for an internal combustion engine. According to the fuel supply device for an internal combustion engine according to the first aspect, since the outlet end of the fuel discharge pipe inserted into the insertion hole of the case is located outside the case, excess fuel accompanying the fuel pressure adjustment of the pressure regulator is removed from the case. By discharging the fuel to the outside and preventing the vibration of the case caused by the discharge pressure of the surplus fuel and its pressure pulsation, vehicle noise can be reduced.

According to a second aspect of the present invention, there is provided the fuel supply apparatus for an internal combustion engine according to the first aspect, wherein the fuel discharge pipe of the pressure regulator is inserted into the insertion hole of the case in a non-contact state. Fuel supply device. According to the fuel supply device for an internal combustion engine according to the second aspect, it is possible to prevent the vibration of the pressure regulator itself (meaning the vibration accompanying the adjustment of the fuel pressure) from being transmitted to the case through the fuel discharge pipe. It is effective for reduction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a fuel supply device for an internal combustion engine, and FIG. 2 is a plan view of the fuel supply device. In FIG. 1, the fuel supply device is a module in which a fuel pump 2, a fuel filter 3, a pressure regulator 4, and the like are accommodated in a case 1 and a bracket 5 is attached to an upper surface of the case 1. It is attached to the fuel tank 6 (see the two-dot chain line in the figure).

The case 1 is made of a synthetic resin and has a substantially cylindrical shape with a bottom. The bracket 5 attached to the upper surface of the case 1 is made of a synthetic resin and has a substantially disk shape that covers the upper surface opening of the case 1. The bracket 5 is placed so as to cover an opening (not shown) on the upper surface of the fuel tank 6 and is fixed by screws or the like (not shown).

On the lower surface of the bracket 5, there is integrally formed a fitting tubular portion 5a fitted into the upper end of the case 1. On the fitting surface between the fitting tube portion 5a and the case 1, a plurality of sets of engaging means formed by engaging projections 7 and engaging holes 8 which can be engaged with each other are arranged on the circumference. Therefore, by inserting the fitting cylindrical portion 5 a into the case 1, the engagement protrusion 7 and the engagement hole 8 are engaged by the elastic deformation of the case 1, whereby the bracket 5 is attached to the case 1.

The bracket 5 has a projecting piece 9 and a connecting pipe 10 integrally formed on the lower surface thereof. On the upper surface of the bracket 5, a fuel outlet pipe 11 is provided.
Is connected to the upper end through a seal material 12. A fuel supply line 13 connected to a delivery pipe of a fuel injector in an internal combustion engine (not shown) is connected to an outlet end of the fuel outlet pipe 11. A first cushion rubber 14 is attached to a lower end of the protruding piece 9.
As shown in FIG. 2, the bracket 5 is integrally formed with a connector 15 having a terminal to which a wiring side connector outside the tank is connected.

In FIG. 1, a fuel pump 2 is housed vertically in the center of the case 1. Fuel pump 2
The fuel is sucked from a pump inlet filter 16 at the bottom thereof and pressurized and discharged from a fuel discharge port 17 at the upper end. The fuel pump 2 is provided with a second plate with respect to the bottom plate of the case 1.
It is elastically supported via a cushion rubber 18. The harness 19 pulled out from the fuel pump 2
Are electrically connected to terminals of the connector 15 of the bracket 5. Further, a sender gauge 20 of a fuel gauge is attached to the outside of the case 1.
The sender gauge 20 includes a float 21 and an arm 22.

A fuel inlet 23 of the fuel filter 3 is connected to a fuel discharge port 17 of the fuel pump 2 through a cylindrical third cushion rubber 24. The fuel filter 3 includes a filter element 25 and a synthetic resin filter case 26 that accommodates the element 25. The fuel filter 3 is elastically supported by the bottom plate of the case 1 via a fourth cushion rubber 27, and has a first cushion rubber 14 attached to the projecting piece 9 of the bracket 5 on the upper surface thereof. Is abutted. The filter case 26 is shown in FIG.
And a communication pipe 28 located on the left side of the fuel pump 2. The communication pipe 28 has connection ports 28a at upper and lower ends.
28b, and a communication port 29 through which the fuel passing through the filter element 25 flows is provided at an intermediate portion thereof.

At the upper end connection port 28a of the communication pipe 28,
The lower end of the connection pipe 10 of the bracket 5 is connected via an O-ring 30. The lower end connection port 2 of the communication pipe 28
8b, the connection port 31 of the pressure regulator 4 is O
They are connected via a ring 32. FIG. 3 is a cross-sectional view of a peripheral portion of the pressure regulator 4.
Will be described with reference to FIG.

The housing 3 of the pressure regulator 4
Reference numeral 3 is made of a metal and is formed by caulking a substantially cylindrical upper half 33a to a substantially bottomed cylindrical lower half 33b at the joining end of the lower half 33b. A connection port 3 into which the O-ring 32 is fitted is provided in the upper half 33a of the housing 33.
1 is formed. A ring-shaped holder 34 is fitted in the upper half 33a, and a valve seat 35 is fitted in the holder 34. A fuel introduction groove 36 penetrating in the vertical direction is formed on the outer peripheral portion of the holder 34. The valve seat 35 is formed with a fuel discharge hole 37 having an open lower end surface. A fuel outlet 38 communicating with the fuel outlet 37 through a holder 34 and a valve seat 35 is penetrated through a side surface (left side surface in the figure) of the upper half 33 a of the housing 33. Further, a fuel discharge pipe 39 made of a pipe is provided at a fuel outlet 38 of the holder 34.
Are connected at one end.

The interior space of the housing 33 is divided into two chambers, an upper pressure regulating chamber 41 and a lower air opening chamber 42, by a diaphragm 40 interposed between the two halves.
A valve 44 for opening and closing the lower end surface of the valve seat 35 is attached to the diaphragm 40. Further, a diaphragm spring 45 for pressing the valve 44 against the valve seat 35 is interposed between the diaphragm 40 and the bottom surface of the housing 33. In addition, in the pressure regulation chamber 41,
The fuel in the communication pipe 28 is inserted into the fuel introduction groove 3 of the holder 34.
Introduced through 6.

The pressure regulator 4 controls the pressure (fuel pressure) of the fuel flowing through the communication pipe 28 connected to the fuel supply line 13 to the sum of the pressure (atmospheric pressure) in the fuel tank 6 and the elastic force of the diaphragm spring 45. When the pressure is lower than the predetermined value, the valve 44 is closed. When the pressure is higher than the predetermined value, the valve 44 is opened, so that excess fuel is returned into the fuel tank 6 through the fuel passage hole 37, the fuel discharge hole 37, and the fuel discharge pipe 39. By
Adjust so that the fuel pressure is always constant.

The fuel discharge pipe 39 of the pressure regulator 4 is inserted into an insertion hole 46 opened on the side surface of the case 1, and its outlet end 39 a is located outside the case 1. Further, the insertion hole 46 is formed with a diameter larger than the outer diameter of the fuel discharge pipe 39, and is in a non-contact state with the fuel discharge pipe 39.

The pressure regulator 4 is elastically supported by a bottom plate of the case 1 via a fifth cushion rubber 47.

The procedure for assembling the fuel supply device will be described. First, the fuel pump 2, the fuel filter 3, and the pressure regulator 4 are provided in the case 1 with cushion rubbers 14, 18, 24, 27, and 47, respectively. Set through. In this state, the bracket 5 is attached to the case 1. By attaching the bracket 5 to the case 1, the lower end of the connection pipe 10 of the bracket 5 is connected to the upper end connection port 28a of the communication pipe 28, and at the same time, the fuel pump 2, the fuel filter 3, and the pressure regulator are connected.
4 is each cushion rubber 14, 18, 24, 27, 4
7, and is elastically supported. Therefore, according to such an assembling structure, the fuel pump 2, the fuel filter 3, and the pressure regulator 4 can be easily assembled without individually installing them.

In the above-described fuel supply device for an internal combustion engine, when the fuel pump 2 operates according to the operation of the engine,
Fuel in the fuel tank 6 is sucked through the pump inlet filter 16 and pressurized. The fuel discharged from the fuel discharge port 17 of the fuel pump 2 is supplied to the fuel supply line 13 through the communication pipe 28, the connection pipe 10 of the bracket 5, and the fuel outlet pipe 11 through the filter element 25 of the fuel filter 3. . The pressure of the supplied fuel is adjusted by the pressure regulator 4 so as to be always constant. The flow of the fuel is shown by arrows in FIGS.

According to the fuel supply device for an internal combustion engine, since the outlet end 39a of the fuel discharge pipe 39 inserted into the insertion hole 46 of the case 1 is located outside the case 1, the fuel pressure of the pressure regulator 4 is adjusted. Excess fuel is discharged outside the case 1. Therefore, it is possible to prevent the vibration of the case 1 due to the discharge pressure of the surplus fuel and the pressure pulsation, thereby reducing vehicle noise.

The fuel discharge pipe 39 of the pressure regulator 4 may be inserted into the insertion hole 46 of the case 1 in a contact state, but as shown in the above-described embodiment, the fuel discharge pipe 39
Of the pressure regulator 4 itself can be prevented from being transmitted to the case 1 through the fuel discharge pipe 39 by reducing the vehicle noise caused by the vibration of the pressure regulator 4 itself. Can be.

Each cushion rubber 14, 18, 2
The transmission of vibrations to the case 1 of the fuel pump 2 and the pressure regulator 4 is attenuated by the elasticity of the pressure valves 4, 27, 47, which is also effective in reducing vehicle noise.

[0024]

According to the fuel supply device for an internal combustion engine of the present invention, the discharge pressure of the surplus fuel discharged from the pressure regulator and the vibration of the case caused by the pressure pulsation can be prevented, and the vehicle noise can be reduced. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a fuel supply device according to an embodiment of the present invention.

FIG. 2 is a plan view of the fuel supply device.

FIG. 3 is a sectional view of a peripheral portion of the pressure regulator.

[Explanation of symbols]

 Reference Signs List 1 case 4 pressure regulator 6 fuel tank 13 fuel supply line 39 fuel discharge pipe 46 insertion hole

Claims (2)

[Claims] 1. A fuel supply device for an internal combustion engine, comprising: a case provided in a fuel tank; and a pressure regulator housed in the case and adjusting a fuel pressure of a fuel supply line to the internal combustion engine. A fuel supply device for an internal combustion engine, wherein the regulator has a fuel discharge pipe for discharging surplus fuel due to fuel pressure adjustment, and the case has an insertion hole for inserting the fuel discharge pipe. 2. The fuel supply device for an internal combustion engine according to claim 1, wherein the fuel discharge pipe of the pressure regulator is inserted into the insertion hole of the case in a non-contact state.