JPH1182239A - Fuel supply device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve which is simple in structure and remarkably improved in easy-to-assemble properties as compared with connectional one. SOLUTION: A check valve 2 is composed by fixing a valve cylinder 22 removably to a housing 21 after inserting a spring 24, valve body 23, and valve cylinder 22 in a valve chamber 211 of a valve housing 21. Therefore, if the check valve 2 is mounted to a housing 1 of a fuel supply device from any direction, the valve cylinder 22 does not deviate from the valve housing 21 and does not generate axis deviation due to its own weight or an energized spring 24 to remarkably improve assembling-ability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fuel supply device and a method for manufacturing the same. The fuel supply device of the present invention is applied to, for example, a gasoline direct injection pump.

[0002]

2. Description of the Related Art For example, Japanese Unexamined Patent Application Publication No.
FIG. 5 shows a structure around a check valve mounting hole of a conventional fuel supply device disclosed in Japanese Patent Publication No. 14140. 1 is a cylinder, 2 is a check valve (delivery valve). The cylinder 1 has a check valve mounting hole 12 in which a check valve is mounted, and the check valve mounting hole 12 is a pump chamber that sucks fuel through an electromagnetic valve and sends out pressurized fuel through the check valve 2 by reciprocation of a plunger. Is in communication with

[0003] The check valve 2 is a valve housing (holder).
21, a valve cylinder 22, a valve body 23, a spring 24, and a spring seat 25. The valve housing 21 has a valve chamber 211 having an inlet-side opening at one end, and is fitted and fixed in the check valve mounting hole 12. The valve cylinder 22 has a penetrating valve hole 221 and is housed at an inlet of the valve chamber 211. The valve body 23 is slidably held in the valve chamber 211, and opens and closes the valve by contacting and separating with the inner end of the valve hole 221. The spring 24 and the spring seat 25 together with the valve chamber 211
And presses the valve body 23 against the inner end of the valve hole 221.

[0004] The check valve 2 is assembled as follows. First, the spring seat 25, the spring 24, the valve element 23, and the valve cylinder 22 are pushed into the valve housing 21 in this order, and the valve housing 22 is checked so as not to come off from the valve housing 21. Screw into the valve mounting hole 12. The gaskets 26 and 27 are provided in advance at the opening and the bottom of the check valve mounting hole 12.

[0005]

However, in the above-described conventional fuel supply device, when the check valve 2 is mounted in the check valve mounting hole 12 and the valve housing 21 is mounted from top to bottom, FIG. As described above, when the valve cylinder 22 easily comes off from the valve housing 21 and falls, and the valve housing 21 is assembled from below to above,
As shown in FIG. 7, the gasket 27 easily falls out of the check valve mounting hole 12 and falls. When the valve housing 21 is assembled horizontally, as shown in FIG.
Due to the urging of 4, the axis of the valve cylinder 22 which protrudes from the valve housing 21 except for the base end thereof is inclined with respect to the axis of the valve housing 21 by the weight of the valve cylinder 22 itself, making it difficult to assemble. There was a problem. Further, if the assembly is forcibly performed with the axial center shifted, there is a possibility that the edge of the inlet-side opening 210 of the valve housing 21 may be damaged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a fuel supply apparatus and a method of manufacturing the same that have a simple configuration and which greatly improve the assemblability of a check valve. It is an issue.

[0007]

According to the fuel supply device of the present invention, the check valve is detached from the valve chamber after the spring, the valve body and the valve cylinder are inserted into the valve chamber of the valve housing. Impossibly fixed to the valve housing. In this way, regardless of the direction in which the check valve is assembled to the housing of the fuel supply device, the valve cylinder may deviate from the valve chamber of the valve housing due to its own weight or the bias of the spring, or There is no deviation, and the assembling workability is significantly improved.

Further, since the fuel supply device of this configuration is used for an ignition type internal combustion engine, the fixing of the valve cylinder to the valve housing is not only performed by welding, but also by the weak coupling force of the valve cylinder relative to the valve housing. A joining method such as press-fitting, caulking, or screwing, in which displacement easily occurs, can be adopted, and increase in man-hour and cost can be suppressed. According to the configuration of the second aspect, in the method of manufacturing the fuel supply device according to the first aspect, further, after inserting a spring and a valve body into the valve chamber and further inserting the valve cylinder, caulking around the inlet of the valve chamber or The check valve is completed by press-fitting so that the valve cylinder cannot be removed, and this check valve is inserted and fixed in a check valve mounting hole of the housing of the fuel supply device.

In this way, the reliability and the assemblability of the check valve assembling step can be improved by simply adding a simple step of swaging.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The above-described fuel supply apparatus of the present invention and the method of manufacturing the same will be described in more detail with reference to the following examples. (First Embodiment) Structure of Fuel Supply Apparatus The fuel supply apparatus of this embodiment is used for an ignition type internal combustion engine, and its structure is shown in FIG. 1 and its main part is enlarged and shown in FIG.

1 is a cylinder (housing), 2 is a check valve, 3 is a fuel intake cylinder, 4 is a plunger, 5 is a tappet, 6 is a spring, 7 is a cam, 8 is a solenoid valve, and 9 is a guide cylinder. The cylinder 1 has a bore 10 in which the plunger 4 reciprocates slidably. The upper part of the cylinder 1 is located on both sides of the solenoid valve mounting hole 11 and the check valve mounting hole 1 is provided.
2 and a fuel suction tube mounting hole 13 are provided, into which the check valve 2 and the fuel suction tube 3 are screwed. The upper end opening of the bore 10 communicates with the solenoid valve 8, the upper part of the bore 10 communicates with the check valve 2 through the check valve communication hole 14, and the center of the bore 10 injects fuel through the fuel suction cylinder communication hole 15. It communicates with the cylinder 3. Furthermore,
A passage 16 is formed in the cylinder 1 to communicate the fuel intake cylinder 3 with the intake of the solenoid valve 8.

The plunger 4 is driven by a cam 7 via a tappet 5 to move up and down in a bore 10. The spring 6 presses the tappet 5 against the cam 7. Reference numeral 9 denotes a guide cylinder fixed to the cylinder 1 and guiding the tappet 5 up and down. A space remaining above the plunger 4 in the bore 10 communicates with the mounting holes 11 and 12 so that the pump reciprocates the plunger 4 to suck in fuel through the solenoid valve 8 and send out pressurized fuel through the check valve 2. Make room P.
The fuel suction tube communication hole 15 is formed below the pump chamber P, and reduces the bore internal pressure to the pressure of the fuel suction tube 3 at this position (recovers fuel oil to the fuel suction tube 3). Then, it has a function of preventing the lubricant from entering the lubricating oil in the guide cylinder 9.

Structure of Check Valve 2 The structure of the check valve 2 will be described with reference to FIG. The check valve 2 has a valve housing (holder) 21, a valve cylinder 22, a valve body 23, a spring 24, a spring seat 25, and a gasket 26. The valve housing 21 has a valve chamber 211 whose one end forms an inlet-side opening 210, and is fitted and fixed in the check valve mounting hole 12. Reference numeral 212 denotes an outlet opening penetrating through the peripheral wall of the valve housing 21 and communicating with the back of the valve chamber 211. The valve cylinder 22 has a through-hole 221.
And is fixed to the inlet of the valve chamber 211 by caulking. The valve element 23 is slidably held in the valve chamber 211, and opens and closes the valve by contacting and separating with the inner end surface of the valve hole 221. The spring 24 and the spring seat 25 together with the valve chamber 2
11 and presses the valve body 23 against the inner end face of the valve hole 221.

The check valve 2 is assembled as follows. First, the spring seat 25, the spring 24, the valve element 23, and the valve cylinder 22 are pushed in this order into the valve chamber 211 of the valve housing 21, and the inside of the distal end of the valve housing 21 extends over the entire outer peripheral surface of the valve cylinder 21. Close. The valve chamber 211 is a bottomed stepped hole, and the valve cylinder 22 is a stepped cylinder corresponding to the hole.
Are fixed to the valve housing 21 so as not to be relatively movable by the stepped portion 213 and the caulking portion 214.

When the valve housing 21 is screwed into the check valve mounting hole 12, the gasket pressing ring 215 presses the gasket 26 against the outer surface of the cylinder 1 to seal. The valve housing 21 is made of a metal having relatively excellent workability, such as an aluminum alloy or soft iron,
Is made of a hard metal having excellent wear resistance because the valve body 23 repeatedly contacts.

Description of Operation of Fuel Supply Apparatus When the tappet 5 and the plunger 4 are lowered in the fuel suction stroke, fuel is sucked from the fuel suction cylinder 3 into the pump chamber P through the passage 16 and the internal passage of the solenoid valve 8, and during the fuel compression stroke. When the tappet 5 and the plunger 4 rise and the amount of fuel in the pump chamber P reaches a predetermined amount, the solenoid valve 8 is shut off, the fuel pressure in the pump chamber P increases, and the fuel pressure further decreases to a constant pressure. Is exceeded, the check valve 2 is opened and fuel is sent out.

In the fuel supply apparatus for an ignition type internal combustion engine described above, the valve cylinder 22 of the check valve 2 is moved to the valve chamber 211 of the valve housing 21 by a simple fixing operation called caulking.
When the check valve 2 is assembled to the cylinder 1, the valve cylinder 22 is pulled out of the valve housing 21, the two shafts are displaced from each other, which hinders the assembly. The assembling can be performed reliably and easily without being damaged.

Since the caulking is performed over the entire circumference of the inlet portion of the valve chamber 211, the caulking is performed through the gap D between the inner peripheral surface of the valve housing 21 facing the valve chamber 211 and the outer peripheral surface of the valve cylinder 22. The pump chamber P communicates with the outlet-side opening 212 of the valve housing 21 so that fuel does not leak. Therefore, a gasket 27 is inserted into the bottom of the check valve mounting hole 12 as in the conventional fuel supply device shown in FIG. 5, and the gasket 27 is pressed against the bottom of the check valve mounting hole 12 by the valve cylinder 22 to perform fuel sealing. There is no necessity, and the operation of accurately setting the gasket 27 and the gasket 27 at the bottom of the small-diameter check valve mounting hole 12 can be omitted.

Further, in this embodiment, when the valve housing 21 is screwed into the check valve mounting hole 12, the bottom of the check valve mounting hole 12 presses the caulking portion 214 of the valve housing 21 against the outer end surface of the valve cylinder 22. In this case, it is possible to further promote prevention of fuel leakage through the gap D. In addition, valve cylinder 2
2 attempts to separate from the valve housing 21 due to the spring 24 and the hydraulic pressure difference when the pump chamber P is at a low pressure, but the urging force and the hydraulic pressure difference of the spring 24 in the fuel supply system for an ignition type internal combustion engine are Is much smaller than that of the fuel supply device described above, and can easily withstand the urging force or the hydraulic pressure difference of the spring 24 by fixing by simple caulking. No misalignment occurs.

(Embodiment 2) A fuel supply apparatus according to another embodiment will be described with reference to FIG. This embodiment is different from the first embodiment in that the distal end of the valve housing 21 is fixed to the valve cylinder 22 and the distal end 216 of the valve seat surface 1 is not fixed.
Is welded to the valve body 2 over the entire circumference.

In this way, it is possible to easily and reliably mount the check valve by eliminating the difficulty of mounting the check valve due to the protrusion of the valve cylinder 22 described above. By preventing liquid leakage through D, the conventional gasket 27 shown in FIG. 5 can be omitted. Embodiment 3 A fuel supply device according to another embodiment will be described with reference to FIG.

This embodiment does not crimp or weld the distal end of the valve housing 21 to the valve cylinder 22 as in the above-described embodiments, but simply inserts the valve cylinder 22 into the valve hole 2.
11 is a very simple method of press-fitting into the large-diameter entrance and fixing them together.
2 is prevented from jumping out. In the case of this press-fitting, the pump chamber P and the outlet-side opening 212 of the valve housing 21 pass through the gap D between the inner peripheral surface of the valve housing 21 facing the valve chamber 211 and the outer peripheral surface of the valve cylinder 22. Since there is a high possibility that fuel will leak due to the communication, the gasket 27 is mounted on the bottom of the check valve mounting hole 12 and the valve housing 21 is mounted.
Is screwed into the check valve mounting hole 12, and the front end face of the valve housing 21 and the outer end face of the valve cylinder 22 are
7, thereby simultaneously preventing the leakage through the gap D and the liquid leakage through the gap d between the outer peripheral surface of the valve housing 21 and the check valve mounting hole 12. However, in order to seal the liquid leak through the double gaps d and D with one gasket 27, the dimensional adjustment is performed so that the front end face of the valve housing 21 and the outer end face of the valve cylinder 22 are flat. Is being done.

In order to facilitate press-fitting of the valve cylinder 22 into the valve hole 211, the inlet side opening of the valve hole 211 is chamfered.
Further, the valve housing 21 is made of aluminum, and the distal end of the valve housing 21 surrounding the inlet of the valve hole 211 is made thin. This makes it possible to more simply achieve the above-described respective effects.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a fuel supply device of the present invention.

FIG. 2 is an enlarged partial sectional view of a main part of the fuel supply device of FIG.

FIG. 3 is an enlarged partial cross-sectional view of a main part of a fuel supply device according to a second embodiment.

FIG. 4 is an enlarged partial cross-sectional view of a main part of a fuel supply device according to a third embodiment.

FIG. 5 is an enlarged partial cross-sectional view of a main part of a conventional fuel supply device.

FIG. 6 is an exploded sectional view showing a check valve attaching operation in the conventional fuel supply device shown in FIG.

FIG. 7 is an exploded cross-sectional view showing a check valve attaching operation in the conventional fuel supply device shown in FIG.

8 is an exploded cross-sectional view showing a check valve attaching operation in the conventional fuel supply device shown in FIG.

[Explanation of symbols]

1 is a cylinder (housing), 2 is a check valve, 4 is a plunger, 8 is a solenoid valve, 11 is a solenoid valve mounting hole, 12
Is a check valve mounting hole, 10 is a bore, P is a pump chamber,
21 is a valve housing, 22 is a valve cylinder, 23 is a valve body, 24 is a spring, 211 is a valve chamber, and 221 is a valve hole.

Claims (2)

[Claims] An electromagnetic valve mounting hole in which an electromagnetic valve is mounted, a check valve mounting hole in which a check valve is mounted, and a bore through which a plunger reciprocates. One end of the bore is provided with the electromagnetic valve mounting hole and the check valve. A housing that forms a pump chamber that communicates with a mounting hole and performs suction of fuel through the solenoid valve and delivery of pressurized fuel through the check valve by reciprocation of the plunger; the check valve has an inlet at one end; A valve housing having a valve chamber having an opening and fitted and fixed in the check valve mounting hole, a valve cylinder having a penetrating valve hole and housed at an inlet of the valve chamber, sliding on the valve chamber; A fuel supply having a valve body that is freely held and that opens and closes a valve by coming into contact with and separating from an inner end of the valve hole, and a spring that is housed in the valve chamber and presses the valve body against the inner end of the valve hole. In the device, the valve housing holds the valve cylinder so as not to be detached. 2. The method of manufacturing a fuel supply device according to claim 1, wherein the spring and the valve body are inserted into the valve chamber, and a periphery of an inlet of the valve chamber is caulked or press-fitted so that the valve cylinder cannot be detached. A method for manufacturing a fuel supply device, comprising: inserting and fixing the check valve into the check valve mounting hole.