JP2010265790A - Manufacturing system of electromagnetic fuel injection valve and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing system of electromagnetic fuel injection valves, enabling efficient break-in operation of the electromagnetic fuel injection valves. <P>SOLUTION: The manufacturing system includes a distribution chamber 60 in which the plurality of electromagnetic fuel injection valves I after an assembling process are mounted, and a tank 70 storing break-in operation liquid L. The distribution chamber 60 is connected to a first supply pipe line 61 and a second supply pipe line 62 via a selector valve 63 so that the first supply pipe line 61 and the second supply pipe line 62 can selectively communicate with the distribution chamber 60 by the selector valve 63. The first supply pipe line 61 is connected to a pressurized-air supply device 69 for pressurizing and supplying air, and the second supply pipe line 62 is connected to a break-in operation liquid supply device 74 for supplying the break-in operation liquid L in the tank 70. Dry break-in operation of the electromagnetic fuel injection valves I using the pressurized air and wet break-in operation using the break-in operation liquid can be performed in combination. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a manufacturing system for an electromagnetic fuel injection valve for supplying fuel to an engine and a manufacturing method thereof, and more particularly, a distribution chamber in which a plurality of electromagnetic fuel injection valves after an assembly process is mounted, and a conditioned operating fluid are stored. A tank, a conditioned operating fluid supply device that pressurizes and supplies the conditioned operating fluid in the tank to the distribution chamber, and an electromagnetic fuel injection while supplying the conditioned operating fluid from the distribution chamber to the plurality of electromagnetic fuel injection valves The present invention relates to an electromagnetic fuel injection valve manufacturing system including a conditioned operating fluid recovery device that recovers a conditioned operating fluid injected from an electromagnetic fuel injection valve and returns it to the tank when the valve is conditioned.

  Conventionally, it is generally known that an initial deterioration of performance in an actual use state is prevented by operating the electromagnetic fuel injection valve after the assembly process (see Patent Document 1 below).

JP 2006-348829 A

  Also, during the acclimatization operation of the electromagnetic fuel injection valve, the fuel is not used with emphasis on safety and work environment, and a special acclimatization operation liquid (for example, clean sol) is allowed to flow through the electromagnetic fuel injection valve. However, the conditioned running fluid has a higher viscosity than the fuel used during actual engine operation. Therefore, although the aging effect of the valve spring in the electromagnetic fuel injection valve is present, the sliding surface and the abutting surface Familiarity (smoothing of uneven parts such as surface cut marks) is low. For this reason, the operation responsiveness of the electromagnetic fuel injection valve changes during mounting on the engine, which causes a disadvantage that the fuel injection flow rate characteristic changes. In order to avoid such inconvenience, the acclimatization operation of the electromagnetic fuel injection valve may be carried out for a long time. According to this, the product shipment from the factory is slowed down due to a decrease in the efficiency of the acclimatization operation. It will cause inconvenience.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electromagnetic fuel injection valve manufacturing system and a method for manufacturing the electromagnetic fuel injection valve that enable efficient habituation operation of the electromagnetic fuel injection valve. To do.

  In order to achieve the above object, the present invention provides a distribution chamber in which a plurality of electromagnetic fuel injection valves after assembly steps are mounted, a tank for storing a conditioned operating fluid, and a conditioned operating fluid in the tank. A conditioned operating fluid supply device for supplying pressurized pressure to the chamber, and an electromagnetic fuel injector for performing a conditioned operation of the electromagnetic fuel injector while supplying operating fluid from the distribution chamber to the plurality of electromagnetic fuel injectors A system for manufacturing an electromagnetic fuel injection valve comprising a conditioned operating fluid recovery device that recovers the conditioned operating fluid injected from the tank and returns it to the tank, wherein the distribution chamber is provided with a first supply line and a second supply line. Are connected via a switching valve, and the switching valve enables the first supply line and the second supply line to selectively communicate with the distribution chamber, and air is pressurized to the first supply line. Possible pressurized air While connecting the feeder, the the second supply conduit to the first, characterized in that connected to the running-liquid supply unit.

  According to the present invention, in addition to the first feature, a bypass conduit that bypasses the electromagnetic fuel injection valve is connected between the distribution chamber and the conditioned operating fluid recovery device, and an open / close valve is connected to the bypass conduit. The provision is the second feature. The on-off valve corresponds to a third on-off valve 81 in an embodiment of the present invention described later.

  Furthermore, the present invention provides the electromagnetic fuel injection valve manufacturing system according to the first feature by connecting the first supply pipe line to the distribution chamber by the switching valve, and from the distribution chamber to the plurality of electromagnetic fuel fuels. A dry habituation operation process in which the acclimation operation is performed while supplying air to the injection valve under pressure, and after the dry habituation operation, the switching valve is switched to connect the second supply line to the distribution chamber. A third feature is that a wet conditioned operation process is performed in which the acclimated operation fluid is pressurized and supplied to the plurality of electromagnetic fuel injection valves and the acclimated operation is sequentially performed.

  Furthermore, in addition to the third feature of the present invention, the fourth feature is that a valve spring adjusting step for adjusting a set load of the valve spring in each electromagnetic fuel injection valve is performed after the wet-conditioned operation step. Features.

  According to the first feature of the present invention, the pressurized air is supplied by connecting the pressurized air supply device to the distribution chamber by switching the switching valve, or by connecting the conditioned operating fluid supply device to the distribution chamber. The dry acclimation operation of the used fuel injection valve and the wet acclimation operation of the fuel injection valve using the acclimation operation liquid can be performed in combination, thereby improving the sliding surface and the abutting surface in the fuel injection valve. The familiarity and cleaning of the familiar surface can be efficiently performed in a short time. In addition, since a plurality of fuel injection valves can be connected to the distribution chamber and the plurality of fuel injection valves can be habituated and operated at the same time, the efficiency of the habituation operation can be greatly improved.

  According to the second feature of the present invention, when the fuel injection valve is removed from the distribution chamber after completion of the habituation operation, the bypass line is made conductive in advance, and the pressurized air supply device is connected via the switching valve. By communicating with the distribution chamber, the conditioned operating liquid accumulated in the distribution chamber can be conditioned by the compressed air and pushed out to the operating liquid recovery device through the bypass line to clean the inside of the distribution chamber. Therefore, when the fuel injection valve is subsequently removed, it is possible to prevent an unnecessary outflow of the operating fluid from the fuel injection valve connection port of the distribution chamber.

  According to the third aspect of the present invention, the dry habituation operation and the wet habituation operation of the fuel injection valve are sequentially performed, so that the sliding surface and the abutting surface in the fuel injection valve have good familiarity, and the familiarity thereof. The surface can be cleaned efficiently in a short time.

  According to the fourth feature of the present invention, the fuel injection flow rate characteristics can be improved by adjusting the fuel injection flow rate after adjusting the set load of the valve spring.

The longitudinal cross-sectional view of the electromagnetic fuel injection valve manufactured by this invention. The process chart which implements the manufacturing system of the electromagnetic fuel injection valve of this invention. 1 is a schematic diagram of a habituation operation device in the electromagnetic fuel injection valve manufacturing system of the present invention.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

  First, referring to FIG. 1, the description starts with an explanation of an electromagnetic fuel injection valve I manufactured according to the present invention (hereinafter simply referred to as a fuel injection valve I). The valve housing 2 of the fuel injection valve I has a cylindrical valve seat member 3 having a valve seat 8 at the front end, and is press-fitted into the outer peripheral surface of the rear end of the valve seat member 3 and is liquid-tightly welded. A movable core housing cylinder 4 made of a body, a nonmagnetic cylinder 6 coaxially and liquid-tightly welded to the rear end of the movable core housing cylinder 4, and an inner peripheral surface of the nonmagnetic cylinder 6 The fixed core 5 is fixed to the rear end of the fixed core 5 and the fuel inlet cylinder 26 is coaxially connected to the rear end of the fixed core 5. A fuel filter 27 is attached to the inlet of the fuel inlet cylinder 26.

  The valve seat member 3 is provided with a valve hole 7 penetrating the center of the conical valve seat 8 and a cylindrical guide hole 9 connected to the rear end of the valve seat 8.

  A portion that does not fit with the fixed core 5 remains as a guide portion 6 a at the front end portion of the nonmagnetic cylinder 6, and the valve assembly V is accommodated in the valve housing 2 extending from the guide portion 6 a to the valve seat member 3. . The valve assembly V includes a spherical valve body 16 that is slidably fitted in the guide hole 9 and opens / closes with respect to the valve seat 8, and a slidably fitted to the guide portion 6a and a movable core. A cylindrical movable core 12 accommodated in the accommodating cylinder 4 and a flange portion 17 connecting the movable core 12 and the valve body 16 are provided. The flange portion 17 is formed integrally with the movable core 12 and is fixed by welding to the valve body 16, and the movable core 12 is disposed so as to face the front end suction surface of the fixed core 5.

  The valve assembly V includes a vertical hole 19 that ends from the rear end surface of the movable core 12 before the valve body 16, a plurality of horizontal holes 20 that communicate with the outer peripheral surface of the flange portion 17, and a valve body. A plurality of chamfered portions 16 a formed on the outer peripheral surface of the 16 and continuing to the lateral hole 20 are provided. An annular spring seat 24 raised from the inner wall is provided in the middle of the vertical hole 19.

  The fixed core 5 has a vertical hole 21 communicating with the vertical hole 19 of the valve assembly V at the center, and a pipe-like retainer 23 that is slotted and has a diameter expansion elasticity is press-fitted into the vertical hole 21. Is done. The valve spring 22 is contracted between the retainer 23 and the spring seat 24, whereby the valve assembly V is urged in the seating direction of the valve body 16 with the valve seat 8. A high-hardness cylindrical stopper member 14 is press-fitted and fixed to the inner peripheral surface of the movable core 12. The valve spring 22 is disposed so as to penetrate the hollow portion of the stopper member 14.

  The stopper member 14 has its outer end slightly protruded from the rear end suction surface of the movable core 12, and usually the front end suction surface of the fixed core 5 with a gap corresponding to the valve opening stroke of the valve assembly V. Is opposed to. Therefore, a gap exists between the fixed core 5 and the movable core 12 even when the valve assembly V in which the stopper member 14 contacts the front end suction surface of the fixed core 12 is opened. The valve opening stroke of the valve assembly V is adjusted by selecting a shim 15 interposed between the axial abutting surfaces of the movable core housing cylinder 4 and the valve seat member 3.

  A coil assembly 28 is fitted on the outer periphery of the valve housing 2. The coil assembly 28 includes a bobbin 29 fitted to the non-magnetic cylinder 6 and a coil 30 wound around the bobbin 29. A movable core is formed by a magnetic coil housing 31 that houses the coil assembly 28. The housing cylinder 4 and the fixed core 5 are magnetically connected. Specifically, a small-diameter connecting cylinder part 31 a is integrally formed at the front end of the coil housing 31 via a step part 31 b, and the connecting cylinder part 31 a is fitted to the outer peripheral surface of the movable core housing cylinder 4. The rear end of the coil housing 31 is connected to the outer peripheral surface of the fixed core 5 via a C-shaped or annular yoke 35.

  An injector plate 10 having a plurality of fuel injection holes 11 communicating with the valve hole 7 is joined to the front end surface of the valve seat member 3 by laser welding. A cylindrical synthetic resin cap 42 that covers the outer periphery of the front surface of the injector plate 10 is fitted on the outer periphery of the front end of the valve seat member 3 and the movable core housing cylinder 4. A seal groove 43 that holds a seal member 41 such as an O-ring is defined between the rear end surface of the cap 42 and the step portion 31 b of the coil housing 31. The sealing member 41 seals the mounting hole in close contact with the inner peripheral surface of the mounting hole when the front end portion of the electromagnetic fuel injection valve I is fitted in the mounting hole provided in the intake system member of the engine. It is.

  From the latter half of the coil housing 31 to the vicinity of the end of the fuel inlet cylinder 26, a hard synthetic resin coating 32 is formed on the outer peripheral surface thereof by injection molding. At this time, a coupler 34 protruding in one side is integrally formed at the intermediate portion of the covering body 32, and the coupler 34 holds a power feeding terminal 33 connected to the coil 30. A seal groove 50 is defined on the outer periphery of the fuel inlet cylinder 26 by a rear end of the covering 32 and a flange 27a which the fuel filter 27 has at the rear end. A seal member 51 such as an O-ring is formed in the seal groove 50. Is installed. The O-ring 51 is in close contact with the inner peripheral surface of the fuel distribution cap when the fuel injection valve I is connected to a fuel distribution cap (not shown) of the fuel rail.

  Thus, during operation of the engine, the high-pressure fuel supplied from the fuel pump to the fuel rail is distributed to the fuel inlet cylinder 26 of the electromagnetic fuel injection valve I, filtered through the filter screen of the fuel filter 27, and then fixed. The core 5 and the hollow portion of the valve assembly V and the inside of the valve seat member 3 are filled. At this time, in the demagnetized state of the coil 30, the valve assembly V is pressed forward by the biasing force of the valve spring 22, and the valve body 16 is seated on the valve seat 8. It is made to wait.

  When the coil 30 is energized by energization, the magnetic flux F generated thereby runs sequentially from the fixed core 5 to the movable core 12 through the yoke 35, the coil housing 31 and the movable core housing cylinder 4, and to the fixed core 5. The movable core 12 is attracted to the fixed core 5 against the set load of the valve spring 22 by the magnetic force generated, and the valve body 16 is separated from the valve seat 8 of the valve seat member 3. The high-pressure fuel advances along the valve seat 8 toward the valve hole 7 and is injected while being atomized from the fuel injection hole 11.

Next, the manufacturing system of the fuel injection valve I will be described with reference to FIG.
[Assembly process S1]
First, the fuel injection valve I is assembled in this assembly step S1. However, in this assembly step S1, the retainer 23 is press-fitted relatively shallowly into the vertical hole 21 of the fixed core 5 so that the set load of the valve spring 22 is sufficiently weaker than a specified value, and the fuel inlet cylinder 26 The fuel filter 27 is not attached to. Next, it moves to the acclimation operation step S2.
[Training operation step S2]
In the habituation operation step S2, the habituation operation device shown in FIG. 3 is used. This acclimation operation device includes a distribution chamber 60 to which rear ends (on the fuel inlet cylinder 26 side) of the plurality of fuel injection valves I after the assembly step S1 are connected, and front ends (injector plates) of the plurality of fuel injection valves I. 10) and a first supply line 61 and a second supply line 62 connected to one end of the distribution chamber 60 via a switching valve 63. The switching valve 63 can selectively connect the first and second supply pipes 61 and 62 to the distribution chamber 60.

  The upstream end of the first supply pipe 61 opens into the air intake 64 of the manufacturing factory. The first supply pipe 61 has air in this order from the air intake 64 toward the switching valve 63. A compressor 65 for pressurizing the air taken in from the intake 64, a first on-off valve 66, a first regulator valve 67 for adjusting the discharge pressure of the compressor 65 to the normal injection pressure of the fuel injection valve I, and a first filter 68 are provided. .

  On the other hand, the upstream end of the second supply pipe 62 is connected to a strainer 83 disposed below the liquid level of the tank 70 that stores the conditioned operating liquid L. The second supply pipe 62 is connected to the strainer 83 side. From the strainer 83 to the switching valve 63, the liquid pump 71 pumps up the operating liquid L and pressurizes it, and the second regulator adjusts the discharge pressure of the liquid pump 71 to the normal injection pressure of the fuel injection valve I. A valve 72 and a second on-off valve 73 are provided.

  The bottom of the recovery chamber 75 is connected to a recovery line 76 that opens to the tank 70, and the recovery line 76 is provided with a second filter 77 and a gas-liquid separator 78. The liquid separated by 78 is sent to the tank 70.

  Further, a bypass conduit 80 is connected between the distribution chamber 60 and the recovery chamber 75 or the recovery conduit 76, bypassing the fuel injection valve I, and a third on-off valve 81 is provided in the bypass conduit 80. It is done.

  On one side of the distribution chamber 60 and the collection chamber 75, an injection signal output means 82 that emits an injection signal to operate a plurality of fuel injection valves I connected thereto is disposed.

  In the above, the air inlet 64, the compressor 65, the first on-off valve 66, the first regulator valve 67, and the first filter 68 constitute the pressurized air supply device 69, and the tank 70, the liquid pump 71, the second regulator valve 72. The second on-off valve 73 constitutes a conditioned operating fluid supply device 74, and the recovery chamber 75, the recovery conduit 76, the second filter 77 and the gas-liquid separator 78 constitute a conditioned operating fluid recovery device 79.

  Thus, during the acclimation operation of the fuel injection valve I, first, the first, second, and third on-off valves 66, 73, 81 are closed, and the rear end portions of the plurality of fuel injection valves I are placed in the distribution chamber 60. The front end portion is connected to the recovery chamber 75, and the injection signal output means 82 is connected to the coupler 34 of the fuel injection valve I.

  Next, the switching valve 63 is switched to the communication side of the first supply pipe 61 and the distribution chamber 60, and the compressor 65 and the injection signal output means 82 are operated with the first on-off valve 66 open. Then, the air taken in from the air intake 64 is pressurized by the compressor 65, regulated by the first regulator valve 67, filtered by the first filter 68, and then supplied into the distribution chamber 60 through the switching valve 63. Then, since the fuel is supplied to the plurality of operating fuel injection valves I, each fuel injection valve I injects the air intermittently from the injection hole 11 toward the recovery chamber 75.

  When the plurality of fuel injection valves I are acclimated and operated in a dry state in this manner, the sliding surfaces of the valve assembly V and the valve housing 2, the valve body 16 and the valve seat 8, the stopper member 14, and the fixed core 12 Smoothing of uneven parts such as cutting traces on the abutting surface is effectively performed, and good familiarity can be obtained at an early stage. During this time, the air passing through each fuel injection valve I is injected into the recovery chamber 75 together with fine wear powder generated inside the valve, filtered by the second filter 77, and then released from the gas-liquid separator 78 to the atmosphere. The

  After the running-in operation in such a dry state is performed for a predetermined time, for example, 30 to 40 seconds, the switching valve 63 is now connected to the first supply line 61 and the distribution chamber while the injection signal output means 82 is in an activated state. The liquid pump 71 is operated with the second on-off valve 73 open while switching to the communication side 60. Then, the conditioned operating liquid L in the tank 70 is pumped up and pressurized through the strainer 83 by the liquid pump 71 and supplied to the distribution chamber 60 through the second supply pipe 62 to the plurality of operating fuel injection valves I. Therefore, each fuel injection valve I intermittently injects the conditioned operating liquid L from the injection hole 11 toward the recovery chamber 75.

  When the plurality of fuel injection valves I are acclimated in the wet state, the sliding surfaces of the valve assembly V and the valve housing 2, the valve body 16 and the valve seat 8, the stopper member 14 and the fixed core 12 are connected. The familiar surface of the abutting surface can be washed with the familiar operating liquid L. The conditioned operating liquid L injected from each fuel injection valve I to the recovery chamber 75 is filtered by the second filter 77, air is separated by the gas-liquid separator 78, and then returned to the tank 70. The conditioned operation in such a wet state is executed for a predetermined time, for example, 5 minutes.

  When the conditioning operation of the plurality of fuel injection valves I is completed, the second on-off valve 73 is closed, the switching valve 63 is switched to the communication side of the first supply pipe 61 and the distribution chamber 60, and the first on-off valve 66 And the 3rd on-off valve 81 is made into an open state. In this way, the air pumped from the compressor 65 is supplied to the distribution chamber 60, and the conditioned operating liquid L accumulated in the distribution chamber 60 can be pushed away to the bypass line 80. The conditioned operating liquid L transferred to the bypass line 80 is filtered by the second filter 77, air is separated by the gas-liquid separator 78, and then returned to the tank 70.

  After the inside of the distribution chamber 60 is cleaned in this way, the plurality of fuel injection valves I are removed from the distribution chamber 60 and the collection chamber 75, and the injection signal output means 82 is removed therefrom. At this time, the operating fluid L can be prevented from flowing out from the fuel injection valve connection port of the distribution chamber 60.

  Next, a new fuel injection valve I to be habituated is connected to the distribution chamber 60 and the recovery chamber 75, and an injection signal output means 82 is connected to them. Thereafter, acclimation is performed in the same manner.

  As described above, by sequentially performing the dry acclimation operation and the wet acclimation operation of the fuel injection valve I, it is possible to ensure good conformability of the sliding surface and the abutting surface in the fuel injection valve I, and Cleaning can be performed efficiently in a short time. According to the actual test, in order to obtain the same habituation state of the fuel injection valve I, the total habituation operation time of dry and wet according to the present invention is shortened to about one-half that in the case of performing only conventional habituation operation. I was able to. In addition, since the plurality of fuel injection valves I can be connected to the distribution chamber 60 and the recovery chamber 75 and the plurality of fuel injection valves I can be habituated and operated at the same time, a significant improvement in efficiency of the habituation operation can be achieved. it can.

  Further, since the load of the valve spring 22 of each fuel injector I at this time is set to be weaker than the normal set load, each fuel injector I can be operated lightly by the relatively small output of the injection signal output means 82. This can contribute to reduction of power consumption in the injection signal output means 82.

After the habituation operation step S2, the process proceeds to the fuel injection flow rate adjustment step S3 in FIG.
[Fuel injection flow rate adjustment step S3]
In this fuel injection flow rate adjustment step S3, in the fuel injection valve I, the set load of the valve spring 22 is adjusted to a predetermined value by appropriately advancing the press-fit of the retainer 23 into the vertical hole 21 of the fixed core 5. Thus, the fuel injection flow rate when the fuel injection valve I is operated once or a predetermined plurality of times is adjusted according to a predetermined value. As described above, by adjusting the fuel injection flow rate after adjusting the set load of the valve spring 22, it is possible to improve the accuracy of the fuel injection flow rate characteristic. After the fuel injection flow rate adjustment step S3, the process proceeds to the performance test step S4.
[Performance test process S4]
In this performance test step S4, a constant fluid pressure is applied to the fuel inlet cylinder 26 to inspect the fluid tightness of the valve body 16 in the closed state, and then the process proceeds to the final assembly step S5.
[Final assembly process S5]
In this final assembly step S5, a fuel filter 27 is attached to the fuel inlet cylinder 26 of the fuel injection valve I. Thus, the fuel injection valve I is manufactured.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the number of the fuel injection valves I connected to the distribution chamber 60 and the collection chamber 75 is arbitrary.

I ... Electromagnetic fuel injection valve L ... Conditioned operating fluid V ... Valve assembly 2 ... Valve housing 16 ... Valve body 22 ... Valve Spring 61 ··· First supply pipeline 62 ··· Second supply pipeline 63 ··· Switch valve 69 ··· Pressurized air supply device 70 ··· Tank 74 ··· Acclimatization Operating fluid supply device 79 .. Acclimatized operating fluid recovery device 80... Bypass pipe 81... Open / close valve (third on-off valve)

Claims (4)

A distribution chamber (60) in which a plurality of electromagnetic fuel injection valves (I) after the assembly step (S1) are mounted, a tank (70) for storing the conditioned operating fluid (L), and a tank (70) A conditioned operating fluid supply device (74) that pressurizes and supplies the conditioned operating fluid (L) to the distribution chamber (60), and an operating fluid acclimated from the distribution chamber (60) to the plurality of electromagnetic fuel injection valves (I). When the acclimation operation of the electromagnetic fuel injection valve (I) is performed while supplying (L), the acclimation operation liquid (L) injected from the electromagnetic fuel injection valve (I) is recovered and the tank (70) An electromagnetic fuel injection valve manufacturing system comprising a conditioned operating fluid recovery device (79) for returning to
A first supply line (61) and a second supply line (62) are connected to the distribution chamber (60) via a switching valve (63), and the first supply line is connected by the switching valve (63). (61) and the second supply pipe (62) can selectively communicate with the distribution chamber (60), and the first supply pipe (61) can be pressurized and supplied with air. 69), and the conditioned operating fluid supply device (74) is connected to the second supply pipe (62). In the electromagnetic fuel injection valve manufacturing system according to claim 1,
A bypass line (80) that bypasses the electromagnetic fuel injection valve (I) is connected between the distribution chamber (60) and the conditioned operating fluid recovery device (79), and the bypass line (80) is opened and closed. A system for manufacturing an electromagnetic fuel injection valve, comprising a valve (81). In carrying out the electromagnetic fuel injection valve manufacturing system according to claim 1,
The switching valve (63) causes the first supply pipe (61) to communicate with the distribution chamber (60), and air is pressurized and supplied from the distribution chamber (60) to the plurality of electromagnetic fuel injection valves (I). However, after the dry habituation operation for performing the habituation operation, and after the dry habituation operation, the switching valve (63) is switched so that the second supply pipe (62) communicates with the distribution chamber (60). An electromagnetic fuel injection characterized by sequentially performing a wet conditioned operation step of performing an acclimation operation of the plurality of electromagnetic fuel injection valves (I) from the chamber (60) while supplying an operating fluid under pressure. Manufacturing method of valve. In the manufacturing method of the electromagnetic fuel injection valve according to claim 3,
A method of manufacturing an electromagnetic fuel injection valve, comprising: performing a valve spring adjustment step of adjusting a set load of a valve spring (22) in each electromagnetic fuel injection valve (I) after the wet acclimation operation step. .

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