JP3811245B2 - Electromagnetic fuel injection valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic fuel injection valve that injects fuel into a plurality of intake ports of an engine, and in particular, an injector body and an injector cap that fits on the outer periphery of the injector body in a housing that houses an electromagnetic actuator. A housing for sequentially fitting and interposing a first seal member and a second seal member between respective fitting surfaces of the injector body, the housing and the injector cap, and fixing the injector body and the injector cap to the housing. A caulking end is formed at one end of the injector body. 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. A discharge hole is provided on the end wall of the injector cap. The present invention relates to improvement of a bag having a plurality of fuel injection holes communicating with the holes.
[0002]
[Prior art]
In such an electromagnetic fuel injection valve, an injector body and an injector cap that fits on the outer periphery of the injector body are sequentially fitted in a housing that houses an electromagnetic actuator, and the injector body and the injector cap are fixed to the housing. It is advantageous to form the caulking end at one end of the housing, because it is easy to fix the injector body and the injector cap, and it is advantageous in manufacturing. Inside, the fuel turns into the injector body and leaks to the outside from the caulking portion.
[0003]
By the way, in order to ensure the liquid tightness of the caulking part, it is necessary to apply a caulking force larger than the value necessary for fixing to the end of the housing in the caulking process, but this may be caused by an injector body, an injector cap, etc. This is unfavorable because it causes distortion and adversely affects performance.
[0004]
Therefore, even if the caulking portion is not liquid-tight, in order to prevent fuel leakage from the portion, the first seal member and the second seal member are respectively provided between the fitting surfaces of the injector body, the housing, and the injector cap. Intervention is an effective means.
[0005]
[Problems to be solved by the invention]
However, interposing the seal member between the fitting surfaces of the injector body, the housing, and the injector cap increases the assembly process accordingly. Forgetting to install the seal member or damaging the seal member due to incorrect installation. Is concerned.
[0006]
The present invention has been made in view of such circumstances, forgetting to attach the seal member between the fitting surfaces of the injector body, the housing, and the injector cap, and whether the seal member is damaged due to an installation error. Another object of the present invention is to provide the electromagnetic fuel injection valve that can be easily inspected after assembly.
[0007]
[Means for Solving the Problems]
To achieve the above object, the present invention includes an injector body in the housing for accommodating the electromagnetic actuator, with sequentially fitted an injector cap which fits on the outer circumference of the injector body, and they injector body, a first sealing member and the second sealing member respectively Kai裝between the fitting surface of the housing and an injector cap caulking end of the injector body and the injector cap to one end of the housing to secure the housing formed in the injector body has a discharge hole which is opened and closed by the valve accommodates a needle valve that is opened and closed by the electromagnetic actuating device is provided, the end wall portion of the injector cap, the discharge hole communicating with an electromagnetic fuel injection valve provided with a plurality of fuel injection holes, the indicator Kuta cap, the portion located between the first seal member and said second sealing member, to form a flange portion which is crimped to the injector body by the caulking end, this flange portion, the crimping edge positioning grooves bite into the provided end portion of the positioning groove by protrude from the crimping end, the feature that it has a pressure leak detection hole communicating the inside and outside of the parts.
[0008]
Thus, after assembly of the electromagnetic fuel injection valve, for inspection, the needle valve is opened and the fuel injection hole of the injector cap is closed, and high pressure air pressure is applied to the injector body from the pressure leak detection hole. If there is an air leak, it is possible to know whether the first or second seal member has been forgotten to be installed or whether the seal is defective.
[0009]
Further, in particular, a flange that is crimped to the injector body by the caulking end of the housing is formed on the injector cap, and a positioning groove that bites the caulking end is provided in the flange, and the end of the positioning groove is pressure leaked. Since the detection hole protrudes from the caulking end portion, the positioning groove of the injector cap also serves as the pressure leak detection hole.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on reference examples shown in the accompanying drawings and examples of the present invention. First, a reference example will be described with reference to FIGS.
[0011]
As shown in FIGS. 1 and 2, an intake port 4 i and an exhaust port 4 e respectively connected to the combustion chamber 3 are formed in the cylinder head 2 joined to the upper surface of the cylinder block 1 of the engine. The intake port 4i branches the outlet side that opens into the combustion chamber 3 into a pair of branch ports 4i ₁ and 4i ₁ , and the exhaust port 4e has the inlet side that opens into the combustion chamber 3 as a pair of branch ports 4e ₁ and 4e. Branches to ₁ . The branch ports 4i ₁ and 4i ₁ and the branch ports 4e ₁ and 4e ₁ are opened and closed by a pair of intake valves 6i and 6i and exhaust valves 6e and 6e.
[0012]
The intake manifold 5i and the exhaust manifold 5e that are connected to the intake port 4i and the exhaust port 4e, respectively, are joined to both side surfaces of the cylinder head 2. An electromagnetic fuel injection valve I of the present invention is mounted on the intake manifold 5i, and fuel is injected from the electromagnetic fuel injection valve I toward the outlets of the pair of branch ports 4i ₁ , 4i ₁ .
[0013]
As shown in FIG. 3, the electromagnetic fuel injection valve I includes a substantially cylindrical housing 11 having an upper chamber 11 ₁ and a lower chamber 11 ₂ that are arranged vertically with an annular partition wall 11a interposed therebetween. Its upper chamber 11 _1, housing the bobbin 13, a yoke 14 which is caulked and fixed to the upper end periphery of the housing 11 abuts against the upper end of the coil 12, and the bobbin 13 is wound around the bobbin 13 adjacent to the partition wall 11a is Is done. 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.
[0014]
The injector body 16 is provided with a pair of upper and lower ring grooves 29 and 30 facing the inner peripheral surfaces of the housing 11 and the injector cap 17, and an O-ring that is in close contact with the inner peripheral surface of the housing 11 in the upper ring groove 29. 31 (first seal member) and an O-ring 32 (second seal member) that is in close contact with the inner peripheral surface of the injector cap 17 are mounted in the lower ring groove 30.
[0015]
One or a plurality of pressure leak detection holes 24 are formed in the injector body 16 and the injector cap 17 between the O-rings 31 and 32 (in the illustrated example, the injector cap 17). The The injector body 16 and the injector cap 17 are fixed to the housing 11 by caulking at the lower end of the housing 11 as follows.
[0016]
That is, as shown in FIGS. 3 and 4, the injector cap 17 includes a cylindrical portion 17 ₁ fitted to the outer periphery of the lower half portion of the injector body 16, and a lower end surface of the injector body 16 connected to the lower end portion of the cylindrical portion 17 _1. end wall 17 ₂ of the cover, and the funnel-shaped from the upper end of the cylindrical portion 17 _1, i.e. annular flange portion 17 abuts the annular shoulder 16 ₄ of the upper half of the injector body 16 to protrude radially outward and obliquely upward _{It consists of three} . The injector cap 17 is a press-molded article, the flange portion 17 ₃ at the time of molding, one or circumference a plurality of notches shaped positioning groove 26 arranged in equidistant is punched. The end wall portion 17 ₂ is in a fixed relationship with the positioning groove 26 and communicates with the discharge hole 16 ₃ and is directed to the pair of branch ports 4i ₁ and 4i _1. Holes 27 are provided. At this time, the pressure leak detection hole 24 is also provided in the peripheral wall of the injector cap 17. The lower end of the positioning groove 26 and the housing 11 so that the coupler half 25 placed mutually fixed relationship position crimping the annular shoulder 16 ₄ of the injector body 16 is crimped, swaged end portion 28 is formed. Moreover, the caulking end portion 28 bites into the positioning groove 26 and fixes the injector cap 17 to a fixed position of the housing 11.
[0017]
When the caulking end portion 28 is bitten into the positioning groove 26 as described above, the rotation of the injector cap with respect to the housing can be reliably performed even if the caulking force is relatively small. Further, since the flange portion 17 ₃ of the injector cap 17 has a funnel shape, after the caulking end portion 28 of the housing 11 is caulked, the caulking portion 17 ₃ is caulked end portion 28 and the annular shoulder portion 16 by its springback action. _It can be securely clamped between the _four , and the caulking force can be further reduced.
[0018]
In FIG. 3 again, at the center of the yoke 14, a fixed iron core 18s fitted into the bobbin 13 and an inlet cylinder 22 projecting upward from the housing 11 are integrally connected. A communication pipe 19 penetrating the center portion is fitted, and a filter 23 is attached to the inlet tube 22.
[0019]
The injector body 16 has a guide hole 16 ₁ that opens toward the stopper plate 15, a conical valve seat 16 ₂ that continues to the lower end of the injector body 16, and a discharge hole 16 ₃ that passes through the center of the guide hole 16 ₁ . A needle valve 21 passing through the through hole 15 ₁ is disposed in the guide hole 16 ₁ . The needle valve includes a pair of upper and lower guide portions 21 ₁ , 21 ₁ slidably fitted in the guide hole 16 ₁ , a valve portion 21 ₂ corresponding to the valve seat 16 ₂ , and a stopper plate 15. with a flange 21 ₃ opposed is formed on the lower surface of the movable iron core 18m opposed to the lower end of the fixed iron core 18s is fixed. Between the movable iron core 18m with the communicating pipe 19, a valve spring 20 for biasing the movable iron core 18 so as to seat the valve portion 21 ₂ on the valve seat 16 ₂ is mounted under compression.
[0020]
Thus, the coil 12, the fixed iron core 11 ₁ , the movable iron core 18, and the valve spring 20 constitute an electromagnetic actuator A that opens and closes the needle valve 21.
[0021]
A coupler half 25 for supplying power to the coil 12 protrudes from one side of the upper portion of the housing 11, and the fuel injection valve I is mounted on the intake manifold 5i with the coupler half 25 directed in a fixed direction. .
[0022]
Next, the operation of this reference example will be described.
[0023]
After assembly of the fuel injection valve I, for inspection, the needle valve I is opened and the injector cap 17 fuel injection hole 27 is closed with a suitable jig, and a high pressure air pressure is introduced from the inlet tube 22 into the injector body 16. multiply. Then, the air pressure is transmitted from the upper and lower ends of the injector body 16 to the outer periphery thereof, but O-rings 31 and 32 are properly mounted between the housing 11 and the injector body 16 and between the injector body 16 and the injector cap 17. Then, the air pressure is prevented from traveling by the O-rings 31 and 32 and does not leak from the pressure leak detection hole 24. Therefore, if there is air leakage from the pressure leak detection hole 24, it means that the O-rings 31 and 32 are forgotten to be mounted, or that the seal is defective due to mounting errors. Thus, by checking the presence or absence of air leakage from the pressure leak detection hole 24, it is possible to know a sealing failure due to forgetting to mount the O-rings 31 and 32 or mounting errors.
[0024]
The fuel injection valve I that has passed the above inspection is mounted on the intake manifold 5i of the engine. Meanwhile, a pair of fuel injection holes 27, 27 of the injector cap 17 is drilled in the end wall portion 17 ₂ a positioning groove 26 as a reference, also in place of the injector cap 17 Hajingu 11 of the same positioning groove 26 as a reference Since the caulking is fixed, when the fuel injection valve I is attached to the intake manifold 5i, the pair of fuel injection holes 27 and 27 can be accurately directed to the pair of branch ports 4i ₁ and 4i ₁ .
[0025]
In the fuel injection valve I, when the coil 12 is demagnetized, the movable iron core 18m and the needle valve 21 are urged downward by the elastic force of the valve spring 20, and the valve portion 21 ₂ is seated on the valve seat 16 ₂ . When the coil 12 is excited and the movable iron core 18m is attracted upward against the elastic force of the valve spring 20, the needle valve 21 is moved upward and the valve portion 21 ₂ is separated from the valve seat 16 ₂ . At this time, when the flange 21 ₃ of the needle valve 21 comes into contact with the lower surface of the stopper plate 15, the valve opening stroke of the needle valve 21 is regulated.
[0026]
When the discharge hole 16 ₃ is thus opened, the high-pressure fuel supplied from the fuel supply source (not shown) to the inlet cylinder 22 of the housing 11 passes through the filter 23, the communication pipe 19, the through groove 15 _{1 of} the stopper plate 15, the injector body. 16 is discharged into the discharge hole 16 ₃ through the gap between the guide hole 16 ₁ and the guide parts 21 ₁ , 21 ₁ of the needle valve 21 and the gap between the valve part 21 ₂ and the valve seat 16 ₂ , and a pair of fuels toward the injection holes 27 and 27 to a pair of branch ports 4i _1, 4i ₁ is 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 that the coil 12 is energized.
[0027]
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 course of the fuel is cut off by the upper and lower O-rings 31 and 32. Therefore, the housing 11 and the injector cap It is possible to prevent fuel leakage from the 17 caulking joints and the pressure leak detection hole 34.
[0028]
5 and 6 show the actual施例of the present invention, instead of the pressure leak detection hole 24, a notch shape of the depth of the positioning groove 26 of the injector body 16, the caulking end 28 of the housing 11 The configuration is the same as that of the previous reference example except that the portion of the positioning groove 26 protruding from the caulking end portion 28 is a pressure leak detection hole 24 which is sufficiently deeper than the length of In the middle, corresponding parts to the previous reference example are denoted by the same reference numerals, and description thereof is omitted.
[0029]
According to this embodiment, the positioning groove 26 also serves as the pressure leak detection hole 24, so that the configuration can be simplified.
[0030]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, pressure leak detection hole 24, as long as a portion located between both O-rings 31 and 32, may be provided on both the housing 11 or the housing 11 and the injector cap 17.
[0031]
【The invention's effect】
According to the present invention as described above, Lee emissions GETS Kuta cap electromagnetic fuel injection valve, the portion located between the first seal member and the second seal member, the pressure leak detection hole communicating the inside and outside of the moiety After assembly of the fuel injection valve, the air from the pressure leak detection hole is applied by applying high pressure air pressure to the injector body with the needle valve open and the fuel injection hole of the injector cap closed for inspection. By investigating the presence or absence of leakage, it is possible to easily and surely know whether the first or second seal member is forgotten to be attached or a seal failure, which is useful for quality control.
[0032]
Also especially Lee emissions Jefferies Kuta cap, to form a flange portion to be crimped to the injector body by caulking end of the housing, to the flange portion, provided with a positioning groove which bite into the crimping end, the end portion of the positioning groove Since the pressure leak detection hole is protruded from the caulking end, the positioning groove of the injector cap also serves as the pressure leak detection hole, which can contribute to simplification of the structure and the manufacturing process.
[Brief description of the drawings]
FIG. 1 is a view showing a state where an electromagnetic fuel injection valve according to a reference example is mounted on an engine.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is a longitudinal side view of an electromagnetic fuel injection valve.
FIG. 4 is a perspective view of the injector cap.
Sectional side view of an electromagnetic fuel injection valve according to actual施例of the present invention; FIG.
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 portion 17 ₃ ··· collar portion 21 ··· needle valve 24 ··· pressure leak detection hole 26 ··· positioning groove 27 ··· fuel injection hole 28 ··· caulking end Part

Claims (1)

A housing (11) an injector body in which housing the electromagnetic actuator (A) (16), with successively fitting the injector cap (17) fitted to the outer periphery of the injector body (16), their injector a body (16), the housing (11) and the first sealing member (31) and a second sealing member (32) and Kai裝respectively between each fitting surface of the injector cap (17), said injector body (16 ) and the caulked end portion (28) to form an injector cap (17) at one end of the housing (11) to secure the housing (11), said injector body (16), said electromagnetic actuator ( needle valve is opened and closed by a) (discharge hole is opened and closed by the valve accommodates 21) (16 ₃₎ provided, said End wall portion of the emission Jefferies Kuta cap (17) to (17 ₂₎ is a the discharge hole (16 ₃₎ and the electromagnetic fuel injection valve provided a plurality of fuel injection holes (27) communicating,
Said injector cap (17), the portion located between said first seal member (31) and said second sealing member (32) is crimped to said injector body (16) by the caulking end (28) A flange (17 ₃ ) is formed, and a positioning groove (26) for biting the caulking end (28) is provided in the flange (17 ₃ ), and the end of the positioning groove (26) is caulked. An electromagnetic fuel injection valve characterized in that a pressure leak detection hole (24) that protrudes from the end portion (28) and communicates the inside and outside of the portion .

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