JPH10238434A - Solenoid-operated fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily ascertain whether seal members are interposed or not and further interposed properly or not in a solenoid-operated fuel injection valve between the fitted faces of an injector body and of a housing and an injector cap after their assembly. SOLUTION: A first seal member 31 and a second one 32 are interposed between the fitted faces of an injector body 16 and of a housing 11 and an injector cap 17. The cap 17 is formed at its position between the first and the second seal members 31 and 32 with a pressure leak detection hole 24 to connect the inside and the outside of the cap together. After their assembly, an air leak through the detection hole 24 upon the checkup application of higher air pressure to the inside of the injector body 16 reveals that seal members are not arranged or are damaged owing to their misarrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic fuel injection valve for injecting fuel into a plurality of intake ports of an engine, and more particularly, to an injector body in a housing accommodating an electromagnetic actuator and an outer periphery of the injector body. The injector caps that fit into
A first seal member and a second seal member are interposed between respective fitting surfaces of the injector body and the housing and the injector cap, and a caulked end is attached to one end of the housing to fix the injector body and the injector cap to the housing. Forming the injector body
A needle valve that accommodates a needle valve that is opened and closed by an electromagnetic actuator and is provided with a discharge hole that is opened and closed by the valve, and an end wall portion of an injector cap is provided with a plurality of fuel injection holes that communicate with the discharge hole. About.

[0002]

2. Description of the Related Art In such an electromagnetic fuel injection valve, an injector body and an injector cap fitted on the outer periphery of the injector body are sequentially fitted in a housing for accommodating an electromagnetic operating device, and the injector body and the injector body are connected to each other. Forming a caulked end at one end of the housing to secure the cap to the housing is advantageous in terms of manufacturing because the injector body and the injector cap can be easily secured, but the liquid tightness of the caulked portion is improved. If it is not good, the fuel will turn inside the injector body to the outer peripheral surface side during operation and leak out from the caulked portion.

By the way, in order to secure the liquid tightness of the caulked portion, it is necessary to apply a large caulking force to the end portion of the housing in the caulking step, which is greater than a value required for fixing. Distortion of the injector cap etc. will adversely affect performance,
Not preferred.

Therefore, even if the caulking portion does not have liquid tightness, in order to prevent fuel leakage from the caulking portion, an injector body,
It is effective means to interpose the first seal member and the second seal member between the fitting surfaces of the housing and the injector cap, respectively.

[0005]

However, providing a seal member between the fitting surfaces of the injector body, the housing, and the injector cap increases the number of assembling steps, and the operator forgets to attach the seal member. Also, there is a concern that the seal member may be damaged due to a mounting error.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and forgotten to attach a seal member between the fitting surfaces of an injector body, a housing, and an injector cap, and damage to the seal member due to an incorrect attachment. It is an object of the present invention to provide the electromagnetic fuel injection valve which can be easily inspected after assembly after assembly.

[0007]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides an injector body and an injector cap fitted on an outer periphery of the injector body in a housing accommodating an electromagnetic actuator. At the same time, a first seal member and a second seal member are interposed between respective fitting surfaces of the injector body, the housing, and the injector cap, and caulked to one end of the housing to fix the injector body and the injector cap to the housing. An end is formed, the injector body accommodates a needle valve that is opened and closed by an electromagnetic actuator, and is provided with a discharge hole that is opened and closed by the valve. The end wall of the injector cap communicates with the discharge hole. An electromagnetic fuel injection valve provided with a plurality of fuel injection holes, comprising a housing and an injector. Of at least one of the Kuta cap,
A first feature is that a pressure leak detection hole is provided in a portion located between the first seal member and the second seal member, the pressure leak detection hole communicating the inside and outside of the portion.

After assembly of the electromagnetic fuel injection valve, a high air pressure is applied to the injector body with the needle valve opened and the fuel injection hole 27 of the injector cap closed for inspection for inspection. The presence or absence of air leakage from the leak detection hole is checked, and if there is air leakage, it is possible to know whether the first or second seal member is forgotten to be attached or a state of poor sealing.

According to the present invention, in addition to the above features, the injector cap is provided with a flange portion which is crimped to the injector body by the caulked end, and a positioning groove is provided for engaging the caulked end into the flange. A second feature is that the end of the positioning groove is formed as a pressure leak detection hole and protrudes from the swaged end.

According to this configuration, the positioning groove of the injector cap also functions as a pressure leak detection hole.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings. First, a first embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 1 and 2, a cylinder head 2 joined to an upper surface of a cylinder block 1 of an engine is provided.
, An intake port 4i and an exhaust port 4e connected to the combustion chamber 3 are formed. The intake port 4i has a pair of branch ports 4i ₁ , 4i _{1 at} the outlet side opening to the combustion chamber 3.
Is branched and exhaust port 4e is branches the inlet side opening into the combustion chamber 3 to a pair of branch ports 4e _1, 4e ₁ to. These branch ports 4i ₁ , 4i ₁ and branch ports 4e ₁ , 4e ₁ are opened and closed by a pair of intake valves 6i, 6i and exhaust valves 6e, 6e.

An intake manifold 5i and an exhaust manifold 5e connected to the intake port 4i and the exhaust port 4e, respectively, are joined to both side surfaces of the cylinder head 2. Intake manifold 5i are electromagnetic fuel injection valve I is mounted of the present invention, the fuel from the electromagnetic type fuel injection valve I is injected bifurcated towards the outlet of the pair of branch ports 4i _1, 4i _1.

As shown in FIG. 3, the electromagnetic fuel injection valve I
Are upper chambers 11 ₁ vertically arranged with an annular partition wall 11a therebetween.
And a substantially cylindrical housing 11 having a lower chamber 11 _2. Coil 12 in its upper chamber 11 _1, which is wound around the bobbin 13, the bobbin 13 adjacent to the partition wall 11a,
Further, a yoke 14 which is in contact with an upper end of the bobbin 13 and is caulked and fixed to a peripheral edge of an upper end of the housing 11 is accommodated. Also in the lower chamber 11 _2, injector body 16 adjacent across the Suttopa plate 15 to the partition wall 11a, and an injector cap 17 which fits is fitted to the lower half of the outer periphery.

The injector body 16 is provided with a pair of upper and lower ring grooves 29, 30 facing the inner peripheral surfaces of the housing 11 and the injector cap 17, respectively, and the upper ring groove 29 is in close contact with the inner peripheral surface of the housing 11. O-ring 31 (first sealing member) is provided in the lower ring groove 3.
The O-rings 32 (second sealing members) that are in close contact with the inner peripheral surface of the injector cap 17 are respectively mounted on the O-rings.

One or a plurality of pressure leak detecting holes 24 are provided at portions of the injector body 16 and the injector cap 17 located between the O-rings 31 and 32 (in the illustrated example, at the portion of the injector cap 17). Drilled. The injector body 16 and the injector cap 17 are fixed to the housing 11 by swaging the lower end of the housing 11 as follows.

That is, as shown in FIG. 3 and FIG.
The injector cap 17 is located in the lower half of the injector body 16.
Cylindrical part 17 fitted to outer periphery of part₁, This cylindrical part 17₁Under
The end that covers the lower end surface of the injector body 16 that is connected to the end
Wall part 17_Two, And the cylindrical portion 17 ₁From the top of the funnel, immediately
Protruding radially outward and obliquely upward
An annular shoulder 16 in the upper half of the day 16_FourAnnular collar 1 that abuts against
7_ThreeIt consists of This injector cap 17
Is a press-formed product, and the flange 17_ThreeTo
Is one or a plurality of notched positions arranged at equal intervals in the circumferential direction
The determining groove 26 is punched. The end wall 17_TwoTo
Is at a certain relational position with respect to the positioning groove 26,
The discharge hole 16_ThreeAnd the pair of branch ports
To 4i₁, 4i₁A pair of fuel injection holes 27, 2
7 are provided. Also, at this time, the injector cap
The pressure leak detection hole 24 is also provided on the peripheral wall of the pressure sensor 17. So
And the positioning groove 26 and the coupler half 25 are fixed to each other.
The annular shoulder 1 of the injector body 16 in the relevant position
6_FourThe lower end of the housing 11 is crimped so that
As a result, a swaged end 28 is formed. Moreover, the swaged end
The part 28 bites into the positioning groove 26 and
The cap 17 is fixed in place on the housing 11.

In this manner, the swaging end 2 is inserted into the positioning groove 26.
When the bite 8 is engaged, the injector cap can be reliably prevented from rotating with respect to the housing even if the caulking force is relatively small. Since the flange portion 17 ₃ of the injector cap 17 and has a funnel-shaped, the housing 11
After caulking the caulking end 28, the flange portion 17 _3, by its springback action with be halted without play securely interposed between a crimping end 28 annular shoulder 16 _4, is further reduce the crimping force It becomes possible.

Referring again to FIG. 3, a fixed core 18s fitted into the bobbin 13 and an inlet tube 22 protruding above the housing 11 are integrally connected at the center of the yoke 14, and are integrally connected to the fixed core 18s. A communication pipe 19 penetrating through the center portion is fitted, and a filter 23 is attached to the inlet tube 22.

The injector body 16 is connected to the stopper plate 1.
Guide hole 16 opening toward 5 ₁, Connected to its lower end
Conical valve seat 16_Two, And discharge through its center
Hole 16_ThreeAnd the through hole 15 of the stopper plate 15₁To
The needle valve 21 penetrating the guide hole 16₁Located in
You. This needle valve has a guide hole 16₁To slide freely
A pair of upper and lower guide sections 21 having a substantially rectangular cross section.₁, 2
1₁And the valve seat 16_TwoValve section 21 corresponding to_TwoAnd the stopper
Flange 21 facing lower surface of plate 15_ThreeIs formed
And a movable core opposed to a lower end of the fixed core 18s.
18m is fixed. The movable core 18m and the communication pipe
19 and between the valve 21_TwoThe valve seat 16_TwoTo sit on
A valve spring 20 for urging the movable iron core 18 is contracted and provided.

The coil 12, the fixed core 11 ₁ , the movable core 18 and the valve spring 20 constitute an electromagnetic actuator A for opening and closing the needle valve 21.

On one side of the upper part of the housing 11, a coil 1
2, a coupler half 25 for projecting power is provided,
The fuel injection valve I is mounted on the intake manifold 5i with the coupler half 25 oriented in a fixed direction.

Next, the operation of this embodiment will be described.

After assembling the fuel injection valve I, the needle valve I is opened for inspection and the injector cap 17 is closed with an appropriate jig, and the fuel injection hole 27 is closed. Apply high air pressure. Then, the air pressure is changed to the injector body 16.
From the upper and lower ends of the housing 1
1 and injector body 16, injector body 16
O-rings 31 and 3 between each of
2 is properly mounted, the air pressure is
The path is blocked by the rings 31 and 32 and does not leak from the pressure leak detection hole 24. Therefore, if air leaks from the pressure leak detection hole 24, it will
This signifies a failure to seal the rings 31 and 32 or an improper seal due to a mounting error or the like. Thus, the pressure leak detection hole 2
By examining the presence or absence of air leakage from 4, it is possible to know that the O-rings 31, 32 have been forgotten to be mounted, or that a sealing failure has occurred due to a mounting mistake or the like.

The fuel injection valve I that has passed the above inspection is mounted on the intake manifold 5i of the engine. By the way, a pair of fuel injection holes 27, 27 of the injector cap 17 are provided.
It is formed in the end wall portion 17 ₂ a positioning groove 26 as a reference, and because the injector cap 17 to the positioning groove 26 as a reference is caulked in place Hajingu 11, the intake of the fuel injection valve I when mounted to the manifold 5i, it is possible to accurately direct the pair of fuel injection holes 27, 27 to a pair of branch ports 4i _1, 4i _1.

In this fuel injection valve I, when the coil 12 is demagnetized, the movable core 18
m and the needle valve 21 is urged downward, valve portion 21 ₂ is seated on the valve seat 16 _2. Further, when the suction upward against the elastic force of the valve spring 20 to the movable iron core 18m by exciting the coil 12, the needle valve 21 moves upward the valve portion 21 ₂ is the valve seat 1
62 Separated from ₂ . By the flange 21 ₃ In this case the needle valve 21 is brought into contact with the lower surface of the stopper plate 15,
The valve opening stroke of the needle valve 21 is regulated.

[0027] Thus when the discharge hole 16 ₃ is opened, high-pressure fuel supplied from a fuel supply source (not shown) to the inlet tube 22 of the housing 11, the filter 23, the communicating pipe 19,
The passage groove 15 ₁ of the stopper plate 15 and the injector body 16
The guide hole 16 ₁ and the guide portion 21 ₁ of the needle valve 21,
21 ₁ and the gap, and through the gap between the valve portion 21 ₂ and the valve seat 16 ₂ is discharged to the discharge hole 16 _3, and a pair of fuel injection holes 27 and 27 to a pair of branch ports 4i _1, 4i ₁ Injected in two directions. At this time, the fuel injection amount from the electromagnetic fuel injection valve I is measured by controlling the length of time during which the coil 12 is energized.

During the operation of the fuel injection valve I, even if the fuel in the injector body 16 turns to the outer peripheral surface side, the path of the fuel is cut off by the upper and lower O-rings 31 and 32. In addition, fuel leakage from the caulked connection portion of the injector cap 17 and the pressure leakage detection hole 34 can be prevented.

FIGS. 5 and 6 show a second embodiment of the present invention. In place of the pressure leak detection hole 24, the depth of the notch-shaped positioning groove 26 of the injector body 16 is determined by the depth of the housing 11. The configuration is the same as that of the previous embodiment except that the positioning groove 26 is made deeper than the length of the caulking end 28 and the portion of the positioning groove 26 protruding from the caulking end 28 is used as the pressure leak detection hole 24. In the figure, portions corresponding to those of the previous embodiment are denoted by the same reference numerals, and description thereof is omitted.

According to this embodiment, the positioning groove 26 also serves as the pressure leak detecting hole 24, so that the structure can be simplified.

The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, in the first embodiment, the pressure leak detection hole 24 may be a square hole, a long hole, or the like in addition to the circular hole shown. The pressure leak detection hole 24 is provided with both O-rings 31,
As long as the portion is located between the housings 32, the housing 11 or both the housing 11 and the injector cap 17 may be provided.

[0032]

As described above, according to the first aspect of the present invention, at least one of the housing of the electromagnetic fuel injection valve and the injector cap is located between the first seal member and the second seal member. Since the pressure leak detection hole communicating between the inside and the outside of the portion is provided, after the fuel injection valve is assembled, the needle valve is opened for inspection and the injector body is closed with the fuel injection hole 27 of the injector cap closed. By checking the presence or absence of air leakage from the pressure leak detection hole by applying high air pressure inside the inside, it is possible to easily and reliably know that the first or second seal member has been forgotten to be installed or that the seal is defective, and that quality control is beneficial. It is.

According to a second aspect of the present invention, in the injector cap, a flange is formed on the injector body by a crimped end, and a positioning groove for cutting the crimped end into the flange is formed. Since the end of this positioning groove is formed as a pressure leak detection hole and protrudes from the crimped end, the positioning groove of the injector cap also serves as the pressure leak detection hole, simplifying the structure and the manufacturing process. Can contribute.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which an electromagnetic fuel injection valve according to a first embodiment of the present invention is mounted on an engine.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a vertical side view of the electromagnetic fuel injection valve.

FIG. 4 is a perspective view of the injector cap.

FIG. 5 is a longitudinal sectional side view of an electromagnetic fuel injection valve according to a second embodiment of the present invention.

FIG. 6 is a perspective view of the injector cap.

[Explanation of symbols]

A: Electromagnetic actuator I: Electromagnetic fuel injection valve 11: Housing 16: Injector body 16 _3: Discharge hole 17: Injector cap 17 ₂ ..End wall part 17 ₃ ... Flange part 21 ... Needle valve 24 ... Pressure leak detecting hole 26 ... Positioning groove 27 ... Fuel injection hole 28 ... Department

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02M 61/16 F02M 61/16 K QS Z 61/18 360 61/18 360Z 65/00 306 65/00 306Z

Claims (2)

[Claims] 1. An injector body (16) and an injector cap (17) fitted on an outer periphery of the injector body (16) are sequentially fitted in a housing (11) for housing the electromagnetic actuator (A). At the same time, a first seal member (31) and a second seal member (32) are interposed between the fitting surfaces of the injector body (16), the housing (11) and the injector cap (17), respectively. A crimping end (28) is formed at one end of the housing (11) to fix the injector cap (17) and the injector cap (17) to the housing (11), and the injector body (16) is provided with an electromagnetic actuator (A). discharge hole which is opened and closed by the valve accommodates a needle valve that is opened and closed (21) to (16 ₃₎ provided an injector cap ( The end wall portion 17) (17 _2), a discharge hole (16 ₃₎ and the electromagnetic fuel injection valve provided with a plurality of fuel injection holes (27) communicating with the housing (11) and the injector cap ( 17)
At least one of the first seal member (31) and the second seal member (31).
An electromagnetic fuel injection valve, characterized in that a pressure leak detection hole (24) communicating between the inside and outside of the portion is provided in a portion located between the seal members (32). 2. The device according to claim 1, wherein the injector cap has a swaged end.
Thereby forming a flange portion to be crimped to the injector body (16) to (17 _3), a positioning groove which bite into the crimping end (28) to the flange portion (17 ₃₎ (26) provided by, the positioning groove ( 26. An electromagnetic fuel injection valve characterized in that the end of (26) serves as a pressure leak detection hole (24) and protrudes from the swaged end (28).