JPS58192960A - Manufacture of electromagnetic fuel injector - Google Patents

Abstract

PURPOSE:To manufacture inexpensively an electromagnetic fuel injector having stable fuel injection characteristic, by setting the stroke of a switching valve precisely in an assembling process. CONSTITUTION:A chuck 22 capable of fixing a magnetic case 7 horizontally is erected on a bed 21. In front of the chuck 22, a measuring device 23 is installed. First, at the stage wherein a magnetic coil 9 and a fixed magnetic core 8 are fixed inside the rear of the magnetic case 7, this magnetic case 7 is fixed on the bed 21 by the chuck 22. Next a measurer 24 is slided backward so that the tip thereof is in contact with the front end surface of the fixed magnetic core, and the relative position O thereof in this state is read with a reference point 24a of the measure 24. Then, a switching valve 5 is inserted, and a dimension L between the front end surface of a housing 2 and the rear end surface of an armature 6 is measured. The measurer 24 is slided in this state, and the relative dimension between the foremost end surface of the housing 2 and the front end surface of the fixed magnetic core is fixed as L+S.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an electromagnetic fuel injector, which is mainly used for internal combustion engine applications or single-point electronically controlled fuel injection systems in automobiles.

Conventionally, an electromagnetic fuel injector 1 has a fuel injection port 5 at the tip of a valve housing 2, and a plunger att (D on-off valve 5 is inserted into a guide hole 4 penetrating the narrow part of the fuel injection port 5, as shown in FIG. 11). and an armature 6t- at the rear end of the on-off valve 5.
The fixed magnetic core 8 and the *ai coil 9 are connected to the rear inside of the open case 7 holding the valve housing 2, and the control @III! is connected from the terminal 10. No. 1 is manually operated to move the on-off valve 5 in the a double direction, and the pressurized WA material is injected. The inside of the fuel injection port 5 of the pipe housing 2 forms a valve seat 6a, and an F'i fuel storm 41 is provided between it and the guard hole 4. An O-ring 11 is fitted on the outside of the rear part of the valve housing 2, and the mounting provided on the front part of the magnetic case 7 is inserted into the 87a and caulked. The magnetic case 7 is made of a strong material and has hard AE centers 8 and 0.
Insert a 12° 15t O-ring for city closure into the space between (
A magnetic coil 9 is installed.

1JIII fixed core 8 is also made of *fly body, and 'e thread @14 is passed through the fine part. Fuel passage 14
A compression spring 15 is inserted in the zero end, and always pushes the on-off valve 5 forward to maintain the on-off valve 5 in the closed position. A sleeve 16 serves as a fixed seat for the compression spring 15. A fuel filter 17 is provided at the rear end of the fuel connection 14.

In such an electric fuel injection system 1, in order to ensure the desired fuel injection timing, the stroke S of the valve closing 5 must be set to F.
It is necessary to assemble the building so that the dimensions of the T building are within the range of several tens of nanometers. Therefore, the weight of the magnetic case 7 is 15IJ between the coupling direction 7b, which is the bottom surface of the person 7a, and the fixed magnetic core 8.
Measure the distance A from the open end, and make sure that the distance B between the rear end (3) of the valve housing 20 and the rear end of the armature 6 of the on-off valve 5 in the closed position is (A-B)-8. Pulpbu・
The method for assembling the rear end L111 of the housing 20 and the valve housing 7b and the valve housing 7b of the open air case 7 and the valve housing
A method has been adopted in which a spacer having a thickness of m1jl[)iUi<0> is interposed after the housing 20, and thereby the stroke St-width is maintained. However, in both methods, dimension A is the combined dimension of two parts and is defined as the internal axial dimension, and dimension 8 is the combined dimension of six parts and the valve housing 2 and the on-off valve 5 are not fixed. It is difficult to measure the tree density. Between the rear end of the valve housing 2, the valve seat 3aW has a high degree of heat treatment due to the required heat treatment, there is a large variation in dimensions, so there is a lot of machining allowance, and the degree of approval is easy. This required a large number of expensive processing machines. Further, in the method using spacers, it was necessary to prepare a large number of spacers by applying VC at intervals of 1 micron.

This @ Ming ignored the problems mentioned above, installed the stroke S of the opening/closing valve on the plate in the assembly machine, and made the cheap 11W & fuel injector more sensitive to fuel injection. The purpose is to provide a way to communicate with Anyu.

According to the present invention, the purpose of this is to increase the axial insertion position of the magnetic case of the valve housing at the assembly knee, and to increase the distance between the rearward direction of the armature and the tip surface of the fixed magnetic core in the closed position of the on-off valve. is determined to be a constant dimension S of δr, and then the pulp housing is fixed to the magnetic case.

The present invention will be explained below based on drawings of embodiments. 2 to 5 show a first embodiment of the invention.

In FIG. 1g2, a chuck 22 that can horizontally identify the magnetic case 7 is installed on a base 211. An Fi measuring device 23 is installed in front of the chuck 22. The m foot ring [23 is equipped with a rotor 24 coaxial with the chuck 22 and a 1st scale 25, and the #III constant 24 slides in the axial direction of the chuck 22 to relatively measure the position of its tip. I can do it.

First, at the stage where the magnetic goosef 0 wave internal VC magnetic coil 9 and the fixed magnetic core 8 are fixed, the magnetic goosef is fixed onto the base plate 21 by the chuck 22. Next, the measuring element 24 is slid backward, its tip is brought into contact with the front end surface of the fixed magnetic core, and its relative position O is determined by the reference point 24m of the measuring element 24. As shown in FIG. 6, the on-off valve 5 with the armature 6 attached is inserted into the valve housing 2.
Measure the dimensions of the end of the valve housing 20 and the rear end surface of the armature 6 in the closed position. As shown in FIG. 4, the valve housing 2 and the on-off valve 5 are attached by inserting the magnetic case 7 fixed onto the chuck 22 into the hole Z&, and inserting the probe 24 between the front end of the valve housing 2. Touch the tips. At this time, air is introduced into the fuel passage u14 of the fixed magnetic core 8 from behind, or the compression spring 15 and sleeve 16 are inserted in advance, and the valve housing 2 and on-off valve 5 are attached to the front. The valve housing 2 is brought into close contact with the probe 24, and the on-off valve 5 is kept in the closed position. The probe 24 is moved by this downward engagement, and the position of the valve housing 2 is adjusted using the reference point 24m so that the relative dimension between the tip of the valve housing 2 and the front end surface of the fixed magnetic core is L+8. To attach the valve housing 2 and the magnetic case 7, the tip of the valve housing 2 and the magnetic case 7 are brought into contact with each other using an electron beam or the like. In addition, the valve
The method for fixing the housing 2 to the magnetic case 7 is as follows:
Any method may be used as long as no axial force is applied to the valve housing 2 during the identification θ. For example, as shown in FIG. You can also caulk the parts to secure them in place.

In the TAB method, the assembly miJ can be measured using only the relatively constant L dimension, which is easy to sew, and there is no need to pair the parts to be assembled before assembly, since the weight resistance is not selective. Furthermore, the axial position of the valve housing 2 with respect to the magnetic case 7 is determined in the assembled state, and since the position of the valve housing 2 in the axial direction with respect to the magnetic case 7 is more constant than the VC, the rear end (3) of the valve housing is polished. The manufacturing cost can be reduced because the s+I processing or spacer is unstable, and since no axial force is generated during bath contact or caulking processing, the installation of the magnetic case 7 can be done with I can do it. It goes without saying that the opening/closing valve 5Q stroke Sθ and the stroke Sθ are the same.

Figures 6 and 7 illustrate a second implementation of the invention. In FIG. 6, a chuck 62 that can horizontally fix the magnetic kusouf is installed on the base m5ih. A secondary rectangular device 66 of a beam near-gain curvature is installed behind the chuck 62. The identification device 55 has a probe 54 coaxially with the chuck 62, and can measure the axial position of the tip of the probe 64. An Ax rod 55 is also disposed in front of the chuck 62 at the same position, and the axial position of the valve housing 20 that comes into contact with the tip of the Ax rod 55 can be adjusted as appropriate. The curved part of the measuring device [1153] has a fixed magnetic core outside the fixed magnetic core, a pressure 4Ili1 upper air flowing in from the piping 56, and an opening/closing valve 5 and a J-mature. 6 and the rear end face of the valve housing to urge them forward. First, when 1 ml of the magnetic coil 9 and the fixed magnetic core 8 are fixed inside the magnetic case 700, they are fixed on the magnetic case 7t'' base plate 61 using the chuck 62.The magnetic coil 9 and the fixed magnetic core 8 are fixed on the base plate 61 using the chuck 62. i, Valve that withstood !1 closure 5.
Insert the housing 2 and push it to the appropriate position using the 8υno〃λ and the Ayo rods 55.
Guide the air and move the on-off valve 5 and valve housing 2 to the front car.
energize.

As a result, the #A surface of the bee-adjusting rod 65 and the forward direction of the valve housing 2 are always in V-contact, and the on-off valve 5 is kept in the closed position. Open valve 1d 1 from terminal/L/1o
Flow to Ki Koi/L/9 and armature 6 to lj! ! 1 Return iron core shavings [11] VC is suctioned to make the on-off valve 5 open, and the measuring gauge 64 of the rear one-piece filter 55 is moved to the rear end face of the on-off valve 5 to read its position. Next, open valve M.
- Set the closing valve 5 to the closed position again, and check the opening/closing valve 5 in this state?
Then, the position of the end face is determined by using the measuring element 64. #4
Adjust the position of the valve housing using the guard loft 55, set it to a position where the stroke of the valve closing 5 is the size of the foot, and in that state... The weight is fixed to the tip of the hole 71 by bath welding, caulking, etc.

In addition, for the on-off valve 5 and the valve nozzle 2t (previous issue), instead of compressed air, the sleeve 58 is removed from the outside of the contact point 64 as shown in Fig. M7. The compression spring 59 may be inserted into the tip of the sleeve 68.

In the tenth method described above, since the stroke S of the on-off valve 5 is directly measured by the measuring element 54, preliminary dimension measurements before assembly as in the first embodiment are unnecessary, and therefore the stroke 501nIWIL is also improved. , it is possible to obtain the same effect as the first embodiment.As explained above, in the present invention, the opening/closing stroke S of the electromagnetic fuel injector is adjusted in the assembly process.

The axial position of the valve nousing to the magnetic case was determined directly by the 14th princess, and then the valve nousing was fixed to the magnetic case at that position by welding, caulking, etc. Since it is well defined, it eliminates the difficulties in manufacturing the electric charge injection and reduces the cost of maintenance.At the same time, the setting degree of the stroke S of the opening/closing box is made the same, thereby improving the injection characteristics. It has the effect of

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing #L both material injector Sakaki construction, 14
FIG. 112 is an N-side view showing a method of fixing the position of the fixed cicada center in the forward direction in the first embodiment of the present invention, FIG. Figure 4 is a diagram showing how to measure the axial position of the valve housing, and Figure 5 is a diagram showing how to measure the axial position of the valve housing, and Figure 5 is how to attach the valve housing to the magnetic case. 11 Vertical #r tooth diagram showing other methods of determining,
FIG. 6 is a vertical view showing the embodiment #52, and FIG. 7 is a M Wt sectional view showing another method of valve nodding and urging the on-off valve forward. 2...Valve housing 5...Opening/closing valve 6...
・Armature 7...Magnetic case 8...m
Constant magnetic core 14...Fuel passage 22.52...
Chuck 24.34... Measuring point 25... Measuring line scale 55...-Yu rod order of appearance Person Representative of Aisan Kogyo Co., Ltd. Patent attorney Hidehihi Okada Patent Office Commissioner Kazuo Wakasugi Incident display Showa f? Year 2nd patent application? 7-L (3. Relationship with the case of the person making the amendment Patent applicant 4, Agent 5, Date of amendment order 7, Symptoms of the amendment (1) "Claims" column of the specification & Amendment Contents (The statement in the “Claims” column of Specification 11 is amended as shown in the attached sheet). L Claim (1) A guide hole with a wire injection port and a valve seat at the tip and penetrating through the small part. an on-off valve that is slidably inserted into the guide hole and normally closes the fuel injection port with a compression spring, and an armature coupled to the rear end of the on-off valve; This armature 1
A fixed magnetic core having a front end face facing the rear end face with a gap therebetween and supporting an electromagnetic coil on the outer periphery, and a magnetic case coupling the valve housing to the fixed magnetic core! D. An electromagnetic fuel injector for an internal combustion engine that opens the on-off valve and injects pressurized fuel while receiving a valve opening signal to the Itl period electromagnetic coil, the electromagnetic fuel injector for an internal combustion engine injecting pressurized fuel; !
The electromagnetic fuel injector's insertion position in the direction of the magnetomotive case is adjusted to a position where the valve housing has a predetermined dimension B, and then the front valve housing is fixed to the Kakakuchi magnetic case. Production method. (2) A measuring stylus KJ that connects the fixed magnetic core and fixes the magnetic case, faces the front end surface of the fixed magnetic core, slides parallel to its axis, and is capable of measuring the relative position of the tip.
The relative dimension between the position of the front end surface of the constant magnetic core and the position of the front end surface of the pulp housing inserted into the magnetic case is a predetermined dimension S in the closed state! 11]
The front end face of the valve housing and the above-mentioned A! Claims characterized in that the position of the pulp housing is determined so that the sum of the dimensions of the back end of the chair and the dimensions of the back end of the chair is equal to (11+L)! [! A method for manufacturing an electromagnetic fuel injector described in Section 1. Combined! Fix the case of the II period porcelain, and
The tip of the adjustment rod is brought into contact with the front end surface of the housing from the J direction, and the on-off valve and the pulp housing marked 8G are biased in one direction with compressed air or a spring member, and the fuel passage of the above-mentioned one line is penetrated. Then, add the above-mentioned gap directly to m# using a chisel whose tip is in contact with the rear end face of the opening/closing valve, and set the position of the above-mentioned Waldhavnder using mt + 4 orthogonal screws so that this becomes a predetermined dimension of 8. Claim 1: A method for producing an iaaowim fuel injection aictm. (4) Manufacturing the electromagnetic fuel device according to any one of claims 1 or 2, characterized in that the valve housing is fixed to the magnetoelectric case by *ti. Method.

Claims (1)

[Scope of Claims] (1) A pulp housing having a fuel injection port and a 9P seat at the tip and a guide hole penetrating through the shaft center, and a sliding port TO inserted into the Mayutoge guide hole. An on-off valve that always closes the fuel injection port by a pressure spring; an armature connected to the rear end of the on-off valve; It consists of a fixed magnetic core that has a penetrating fuel passage in the axial center and supports an electromagnetic coil on the outer periphery, and a magnetic case that connects the pulp housing and the fixed magnetic core, and is open to the electromagnetic coil 1/L/. An electromagnetic fuel injector for an internal combustion engine that opens two on-off valves on both sides and injects pressurized fuel while receiving a valve signal, and the magnetic case and
By adjusting the axial insertion position of
and then fixing the pulp housing to the magnetic case - How to use a fuel injector. (N) Ichiki Ichiki case combining cocoon heavy fixed magnetic core (
5) Measure the relative position of the tips by facing the front ends of the cocoon-heavy fixed magnetic core and sliding parallel to its axis. The relative dimension with the position of the shavings of the pulp nozzle inserted into the above-mentioned space is the front of the cocoon-heavy pulp nozzle at the predetermined dimension S and the closing height Vc. Layer (3) and @ Kier 1 Chair #! Dimensions and cosa with 11ilrki, (
8+L) A method for manufacturing an electromagnetic fuel injector according to the first product of the %ffl11 equation, characterized in that the position of the valve breakout is determined so as to be equal to 8+L). (3) Fix the sIl magnetic case to which the # fixed magnetic core is connected, and dI from the front to the front end surface of the m-age pulp housing.
4. Place the tip of the jar loft on top and close the opening/closing valve and the bar.
The gas housing is urged forward with compressed air or a spring member, and the contact point is connected between the contact point and the contact point by passing through the fuel passage of the fixed magnetic core and having its tip abutted toward the rear end of the closing valve. The method for manufacturing an electromagnetic fuel injector according to claim 1, characterized in that the position of the pump housing is determined by a VC pre-alignment rod so that the measured size becomes a predetermined dimension S. . (4) The above-mentioned valve housing is fixed to the magnetic case by welding. Paragraph 1 and 9 of the paragraph 1 and 9 of paragraph 2 above are the l of any one of paragraph 2.
A method for manufacturing a dL fuel outlet device.