JP5394166B2 - Electromagnetic actuator and electromagnetic fuel injection valve - Google Patents

Description

  The present invention relates to an electromagnetic actuator including an electromagnetic fuel injection valve and an improvement of the electromagnetic fuel injection valve.

  Conventionally, as disclosed in Patent Document 1 below, as an electromagnetic fuel injection valve, a valve seat member having a valve seat and a valve hole at the front end, a magnetic cylindrical body, a nonmagnetic cylindrical body, a fixed core, and a fuel inlet cylinder are provided. A valve housing connected in the axial direction and having an internal fuel flow path; and a movable core capable of reciprocating between an operating position in contact with the suction surface of the fixed core and a retracted position separated from the suction surface in the valve housing; , A return spring for urging the movable core toward the retracted position side, a coil disposed on the outer periphery of the fixed core, and a magnetic cylindrical body and a fixed core that house the coil, and are connected to the coil. A coil housing that forms a magnetic circuit with the magnetic cylinder and the fixed core when energized, a synthetic resin coupler that is formed on one side of the coil housing and accommodates and supports a coupler terminal connected to the coil, and is connected to the movable core Is And a valve body that opens and closes the valve hole by the reciprocating motion of the movable core. When the magnetic circuit is formed, the movable core is attracted to the suction surface of the fixed core by excitation of the fixed core and the movable core. What contacted and regulated the valve opening limit of a valve element is known.

JP 2005-240731 A

  In this type of electromagnetic fuel injection valve, when the coil is energized, the movable core is attracted and brought into contact with the fixed core by the magnetic attraction force generated between the fixed core and the movable core due to the formation of the magnetic circuit, and the valve body is opened. The fuel is injected from the valve hole, and when such a valve body is opened, vibration due to a contact shock is generated between the fixed core and the movable core, and this vibration is generated by the fixed core. The vibration is transmitted to the coupler and the coupler resonates to generate noise, and the vibration also causes the valve body to bounce open and cause the fuel injection characteristics to be distorted.

  Therefore, in the electromagnetic fuel injection valve disclosed in Patent Document 1, the valve housing is covered with a two-layer synthetic resin coating layer, and the outer coating layer covers the base of the coupler, and is generated in the valve housing. Although the vibration is absorbed by the double coating layer and the transmission to the coupler side is suppressed as much as possible, the formation of the double coating layer is expensive, making it difficult to reduce the cost and increasing the weight. In addition, the double coating layer has no effect of suppressing bounce of the valve body.

  Therefore, when such a technique is applied to other electromagnetic actuators, it is difficult to reduce the cost and weight of the apparatus as well as the above, and it is also difficult to suppress the operating bounce of the operating member. .

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an electromagnetic actuator capable of satisfying noise reduction, weight reduction, and suppression of operation bounce at low cost, and noise at low cost. An object of the present invention is to provide an electromagnetic fuel injection valve capable of satisfying reduction, weight reduction, and valve opening bounce suppression.

  In order to achieve the above object, the present invention comprises a housing in which a magnetic cylinder, a non-magnetic cylinder and a fixed core are sequentially connected in the axial direction, an operating position in contact with the suction surface of the fixed core in the housing, A movable core that can reciprocate between retracted positions that are separated from the suction surface, a return spring that biases the movable core toward the retracted position, a coil that is disposed on the outer periphery of the fixed core, and a coil that accommodates the coil. A coil housing connected between the magnetic cylindrical body and the fixed core and forming a magnetic circuit with the magnetic cylindrical body and the fixed core when the coil is energized, and a coupler formed on one side of the coil housing and connected to the coil A synthetic resin coupler for accommodating and supporting the terminal, and an operating member connected to the movable core. When the magnetic circuit is formed, the movable core is attracted to and brought into contact with the suction surface of the fixed core. The electromagnetic actuator which is adapted to restrict the operating limits of the fixed core, the first, characterized in that specific gravity was Fe-Al alloy having a magnetic permeability at 7.2 or less. The electromagnetic actuator corresponds to an electromagnetic fuel injection valve I in an embodiment of the present invention, which will be described later, and the housing and the operating member are respectively connected to the valve housing 2 and the valve body 14 in the embodiment. Correspond.

  In addition to the first feature of the present invention, the second feature is that the movable core is made of a Fe-Al alloy having a specific gravity of 7.2 or less and having magnetic permeability.

  Furthermore, the present invention relates to a valve housing having a valve seat member having a valve seat and a valve hole at the front end, a magnetic cylindrical body, a nonmagnetic cylindrical body, a fixed core, and a fuel inlet cylinder in the axial direction and having an internal fuel flow path. A movable core capable of reciprocating between an operating position contacting the suction surface of the fixed core in the valve housing and a retracted position separated from the suction surface; and a return spring for biasing the movable core toward the retracted position side; , A coil disposed on the outer periphery of the fixed core, and a coil that is connected between the magnetic cylinder and the fixed core that accommodates the coil, and forms a magnetic circuit with the magnetic cylinder and the fixed core when the coil is energized A housing is formed on one side of the coil housing, and is coupled to a synthetic resin coupler that accommodates and supports a coupler terminal connected to the coil, and a movable core, and the valve hole is opened and closed by the reciprocating motion of the movable core. valve In the electromagnetic fuel injection valve, the movable core is attracted and brought into contact with the attracting surface of the fixed core to regulate the valve opening limit when the magnetic circuit is formed. Is made of a Fe—Al alloy having a specific gravity of 7.2 or less and magnetic permeability.

  Furthermore, in addition to the third feature, the present invention provides a ring-like shape that restricts the valve opening limit of the valve element by contacting the suction surface of the movable core that faces the suction surface of the fixed core. A fourth feature is that the stopper member is made of a Fe—Al alloy having a specific gravity of 7.2 or less and a magnetic permeability.

  Furthermore, in addition to the third or fourth feature, the fifth feature of the present invention is that the movable core is made of a Fe—Al alloy having a specific gravity of 7.2 or less and having magnetic permeability.

  According to the first feature of the present invention, since the Fe—Al alloy constituting the fixed core has vibration damping properties, even when the movable core is shocked against the attracting surface of the fixed core when the magnetic circuit is formed. The vibration generated at that time can be absorbed by the fixed core itself to suppress the transmission of vibration to the coupler and to prevent the generation of noise due to the vibration resonance of the coupler. At the same time, the vibration of the movable core is also absorbed by the fixed core, so that the operation bounce of the operation member integrally connected to the movable core can be suppressed.

  Moreover, the specific gravity of the magnetically permeable Fe-Al alloy that constitutes the fixed core with the largest volume in the housing is 7.2 or less, which is about 6 to 16% smaller than other magnetically permeable materials. As a result, the weight of the electromagnetic actuator can be reduced. In addition, it is not necessary to form an expensive double coating layer for vibration isolation on the housing, and the cost can be reduced.

  According to the second feature of the present invention, the movable core is made of an Fe-Al alloy having a specific gravity of 7.2 or less and magnetic permeability, so that the abutment impact between the movable core and the fixed core is also caused by the movable core. Therefore, it is possible to further prevent the generation of noise and suppress the valve opening bounce, and at the same time, further reduce the weight of the movable core, and further reduce the weight of the electromagnetic actuator. In addition, the weight reduction of the movable core can contribute to the improvement of the attraction response of the movable core, that is, the operation response of the operating member when the magnetic circuit is formed.

According to the third feature of the present invention, since the magnetically permeable Fe-Al alloy constituting the fixed core has vibration damping properties, the stopper member of the movable core is placed on the attracting surface of the fixed core when the electromagnetic circuit is formed. Even if it makes impact contact, the vibration generated at that time is absorbed by the fixed core itself, so that vibration transmission to the coupler can be suppressed, and generation of noise due to vibration resonance of the coupler can be prevented. Simultaneously absorbed by also fixed core vibration of the movable core, to suppress opening bounce of the valve body, quickly stable valve-opening state of the valve body, it is possible to obtain a fuel injection flow characteristics as prescribed, As a binding As a result, the silence of the electromagnetic fuel injection valve and the fuel injection flow rate characteristics can be improved.

  Moreover, the specific gravity of the magnetically permeable Fe-Al alloy that constitutes the fixed core with the largest volume in the valve housing is 7.2 or less, which is approximately 6 to 16% smaller than other magnetic permeable materials. Therefore, the weight of the electromagnetic fuel injection valve can be reduced. In addition, it is not necessary to form an expensive double coating layer for vibration isolation on the valve housing, and the cost can be reduced.

  According to the fourth feature of the present invention, the stopper member also has vibration damping properties, and the valve opening bounce of the valve body can be further suppressed.

  According to the fifth feature of the present invention, the abutment impact of the movable core and the fixed core can be absorbed also by the movable core, and it is possible to further prevent the generation of noise and the valve opening bounce. At the same time, it is possible to further reduce the weight of the movable core and further reduce the weight of the electromagnetic fuel injection valve. In addition, the weight reduction of the movable core improves the suction response of the movable core, that is, the valve opening response of the valve body when forming the magnetic circuit, and can contribute to the improvement of the high speed performance of the engine.

The longitudinal cross-sectional view of the electromagnetic fuel injection valve which concerns on the Example of this invention. 2 is an enlarged view of part 2 of FIG. The valve body operation | movement comparison diagram of the electromagnetic fuel injection valve of this invention and the conventional electromagnetic fuel injection valve.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings. In the electromagnetic fuel injection valve of the present invention, the fuel injection side is referred to as the front, and the fuel inlet side is referred to as the rear.

  In FIG. 1, a valve housing 2 of an electromagnetic fuel injection valve I for an engine includes a cylindrical valve seat member 3 and a magnetic cylinder that is fitted to a rear end portion of the valve seat member 3 and is liquid-tightly welded. A body 4, a nonmagnetic cylindrical body 6 that is liquid-tightly welded against the rear end of the magnetic cylindrical body 4, and a front end portion is fitted to the inner peripheral surface of the nonmagnetic cylindrical body 6 to be liquid-tight. A cylindrical fixed core 5 to be welded and a fuel inlet cylinder 26 integrally connected to the rear end of the fixed core 5 with the same material.

  The valve seat member 3 includes a valve hole 7 that opens to the front end surface thereof, a conical valve seat 8 that is continuous with the inner end of the valve hole 7, and a cylindrical valve body that is continuous with the large-diameter portion of the valve seat 8. A guide hole 15 and a cylindrical large diameter hole 17 larger in diameter than the valve body guide hole 15 and connected to the rear end of the valve body guide hole 15 via a tapered hole 16 are provided.

  As shown in FIG. 2, a steel plate injector plate 10 having a plurality of fuel injection holes 11 communicating with the valve hole 7 is welded to the front end surface of the valve seat member 3 in a liquid-tight manner.

  The fixed core 5 has a suction surface 5 a formed at the front end thereof positioned inside the nonmagnetic cylindrical body 6. A portion that does not fit with the fixed core 5 remains at the front end portion of the nonmagnetic cylindrical body 6, and the valve assembly V is accommodated in the valve housing 2 that extends from the portion to the valve seat member 3.

  The valve assembly V has a spherical valve body 14 slidably supported in the valve body guide hole 15 so as to open and close the valve hole 7 in cooperation with the valve seat 8, and the valve body 14 includes A valve shaft 13 coupled by welding and a cylindrical movable core 12 that integrally protrudes from the front end of the valve shaft 13 are configured. The movable core 12 is formed on the inner peripheral surface of the magnetic cylindrical body 4. An annular journal portion 12a is slidably supported. Therefore, the valve assembly V is slidably supported on the valve housing 2 at two points of the valve body 14 and the journal portion 12a that are largely separated from each other, so that the opening / closing posture of the valve assembly V is stabilized. The movable core 12 has a suction surface 12b formed at the rear end thereof opposed to the suction surface 5a of the fixed core 5. Around the spherical valve body 14, a plurality of flat flow path portions 18, 18... Permitting the passage of fuel are formed at equal intervals.

  1 and 2, the fixed core 5 is provided with a first vertical hole 19 connected to the hollow portion of the fuel inlet tube 26. The valve assembly V has a second vertical hole 20 that starts from the rear end surface of the movable core 12 and ends at the middle portion of the valve shaft 13, and the second vertical hole 20 is opened to the large-diameter hole 17 of the valve seat member 3. And a single lateral hole 21 is provided.

The valve shaft 13 protrudes integrally from the front end of the movable core 12, and has a hollow shaft portion 13a having a diameter smaller than that of the movable core 12, the same diameter as the valve body guide hole 15, and the second vertical hole 20. The front end of the hollow shaft portion 13a is integrally connected to the front end of the hollow shaft portion 13a via a tapered step portion 13c, and is formed of a solid shaft portion 13b having a smaller diameter than the valve element guide hole 15. At that time, the solid shaft portion 13 b has a front end protruding into the valve body guide hole 15 to define a cylindrical flow path 25 between the solid shaft portion 13 b and the inner peripheral surface of the valve body guide hole 15.

In the middle of the second vertical hole 20, an annular spring seat 24 facing the fixed core 5 is formed. The first longitudinal hole 19 of the stationary core 5 is slotted pipe-shaped retainer 23 is press-fitted, it urges the movable core 12 in the closing side of the valve body 1 4 between the retainer 23 and the spring seat 24 The return spring 22 is contracted. At that time, the set load of the return spring 22 is adjusted by the fitting depth of the retainer 23 into the first vertical hole 19.

  A ring-shaped stopper member 37 is embedded in the movable core 12 so as to slightly protrude from the rear end surface facing the fixed core 5. The stopper member 37 has a predetermined gap between the opposed end surfaces of the fixed core 5 and the movable core 12 by contacting the front end surface of the fixed core 5 when the fixed and movable cores 5 and 12 are attracted to each other. It will be left.

  A coil assembly 28 is fitted to the outer periphery of the valve housing 2 so as to correspond to the fixed core 5 and the movable core 12. The coil assembly 28 includes a bobbin 29 fitted to the outer peripheral surface from the rear end portion of the magnetic cylindrical body 4 to the fixed core 5, and a coil 30 wound around the bobbin 29. At the rear end portion, a base end portion of the coupler terminal 33 protruding to one side is held, and the terminal of the coil 30 is connected to the coupler terminal 33. The coil assembly 28 is molded with an insulating coating layer 27 made of synthetic resin and covering the outer periphery of the coil 30 so as to embed the coil 30. At this time, a coupler 34 that receives and holds the coupler terminal 33 and protrudes to one side of the coil assembly 28 is integrally formed with the insulating coating layer 27.

  The front and rear end portions of the magnetic coil housing 31 surrounding the coil assembly 28 are welded to the outer peripheral surfaces of the magnetic cylindrical body 4 and the fixed core 5.

  An outer covering layer 32 made of a synthetic resin for embedding the bases of the coil assembly 28, the coil housing 31 and the coupler 34 extends from the rear half of the magnetic cylinder 4 to the front half of the fuel inlet cylinder 26. It is formed by molding. At this time, a thick part 32 a that covers the rear step part 26 a of the fuel inlet cylinder 26 is formed at the rear end of the outer coating layer 32, and the fuel that is press-fitted into the thick part 32 a and the inlet of the fuel inlet cylinder 26. An O-ring 51 is mounted on the outer peripheral surface of the fuel inlet cylinder 26 between the filter 43 and the mounting flange 43a. A seal member 52 that is in close contact with the front end surface of the outer coating layer 32 is attached to the outer periphery of the magnetic cylindrical body 4.

  In such a valve housing 2 of the electromagnetic fuel injection valve I, the fixed core 5 having the largest volume is made of a Fe—Al alloy having a specific gravity of 7.2 or less and permeability. In this embodiment, since the fuel inlet cylinder 26 is formed integrally with the fixed core 5, the fuel inlet cylinder 26 is also made of the same Fe-Al alloy, but the fuel inlet cylinder 26 is made of pipe material. , It can also be liquid-tight welded to the rear end of the fixed core 5.

  Further, the movable core 12, the valve shaft 13, and the stopper member 37 are also made of a Fe—Al alloy having a specific gravity of 7.2 or less and permeability.

  This Fe—Al alloy is composed of Al: 8% by weight or less, the balance: Fe and inevitable impurities, and a desirable composition is as follows.

Al ... 7.2% by weight
Fe ... balance Inevitable impurities Si ... 0.05% by weight
Mn: 0.03% by weight
P: 0.003% by weight
S: 0.002% by weight
Cr: 0.03% by weight
Ni: 0.01% by weight
The specific gravity of the Fe-Al alloy and other materials having the same magnetic permeability is shown below.

Fe-Al alloy (Al: 7.2% by weight)... 7.2 g / cm @ 3
Silicon steel ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 7.8g / cm3
Stainless steel (SUS304) ... 7.93 g / cm3
Stainless steel (SUS430) ... 7.7g / cm3
Stainless steel (SUS440C) ... 7.7g / cm3
Stainless steel (SUS420J2) ... 7.75 g / cm3
Nickel alloy (permalloy) ... 8.6g / cm3
As is clear from the above, the specific gravity of the Fe—Al alloy is approximately 6 to 16% smaller than the specific gravity of other magnetically permeable materials.

  Next, the operation of this embodiment will be described.

High-pressure fuel pumped from a fuel pump (not shown) to the fuel inlet cylinder 26 is filtered by the fuel filter 43, and then the inside of the valve housing 2, that is, the hollow portion of the fuel inlet cylinder 26, the first vertical hole 19 of the fixed core 5, The second vertical hole 20 and the horizontal hole 21 of the valve assembly V, the large-diameter hole 17, the tapered hole 16 and the valve body guide hole 15 of the valve seat member 3 are filled. And in the state where the degaussing coil 30, the valve assembly V by the urging force of the return spring 22 is pushed forward, thereby seating the valve body 1 4 on the valve seat 8.

When the coil 30 is energized from the coupler terminal 33, a magnetic circuit is formed over the coil housing 31, the magnetic cylindrical body 4, the movable core 12 and the fixed core 5, and the movable core is attracted by the magnetic force generated between the cores 5 and 12. 12 is attracted to the stationary core 5 against the set load of the return spring 22, the valve body 1 4 since lifted from the valve seat 8, the valve hole 7 is opened. At that time, a ring-shaped stopper member 37 protruding from the suction surface 12 b of the movable core 12 abuts against the suction surface 5 a of the fixed core 5, thereby defining the valve opening limit of the valve element 14.

  Thus, when the valve hole 7 is opened, the high-pressure fuel in the valve seat member 3 exits the valve hole 7 and the electromagnetic fuel injection valve I is mounted from the fuel injection hole 11 of the injector plate 10. Not injected into the throttle body or engine intake passage.

  By the way, the material made of Fe—Al alloy constituting the fixed core 5 has vibration damping properties. Therefore, the movable core 12 is attracted to the fixed core 5, and the stopper member 37 of the movable core 12 serves as the suction surface of the fixed core 5. Even if it abuts against 5a impactively, the vibration generated at that time is absorbed by the fixed core 5 itself, so that the vibration is immediately attenuated to suppress the transmission to the coupler 34, and the noise caused by the vibration resonance of the coupler 34 Can be prevented. At the same time, the vibration of the movable core 12 is also absorbed by the fixed core 5, so that the valve opening bounce of the valve body 14 integrally connected to the movable core 12 is suppressed, so that the valve body 14 is quickly opened. A stable fuel injection flow rate characteristic can be obtained, and the quietness of the electromagnetic fuel injection valve I and the fuel injection flow rate characteristic can be improved.

  In addition, the specific gravity of the magnetically permeable Fe-Al alloy constituting the fixed core 5 having the largest volume in the valve housing 2 is 7.2 or less, which is about 6 to 16% smaller than other permeable materials. By adopting the fixed core 5 made of Al alloy, the valve housing 2 can be reduced in weight, and the electromagnetic fuel injection valve I can be reduced in weight. In addition, it is not necessary to form an expensive double coating layer for vibration isolation on the valve housing 2, and the cost can be reduced.

  Further, since the movable core 12, the valve shaft 13 and the stopper member 37 are also made of Fe-Al alloy having a specific gravity of 7.2 or less and magnetic permeability, the contact impact of the movable core 12 and the fixed core 5 is applied to the movable core 12 and It can also be absorbed by the stopper member 37, can further prevent noise generation and suppress the valve opening bounce of the valve body 14, and at the same time reduce the weight of the movable core 12, and hence the electromagnetic fuel injection valve I. The weight can be further reduced. In addition, the weight reduction of the movable core 12 improves the suction response of the movable core 12, that is, the valve opening response of the valve body 14 when the magnetic circuit is formed, and can contribute to the improvement of the high speed performance of the engine.

  FIG. 3 is a valve body operation comparison diagram between the electromagnetic fuel injection valve I of the present invention and a conventional electromagnetic fuel injection valve. As is clear from this, in the electromagnetic fuel injection valve I of the present invention, The valve body opens faster and the vibration is damped faster than the conventional one.

  As mentioned above, although the Example of this invention was described, this invention is not limited to it, A various design change is possible in the range which does not deviate from the summary. For example, the present invention can be applied to an electromagnetic actuator other than the electromagnetic fuel injection valve.

I ... Electromagnetic actuator, electromagnetic fuel injection valve 2 ... housing, valve housing 3 ... valve seat member 4 ... magnetic cylinder 5 ... Fixed core 5a... Suction surface 6 ... Non-magnetic cylindrical body 7 ... Valve hole 8 ... Valve seat 12 ... Movable core 12b ... Suction surface 14 .... Actuating member, valve element 22 ... Return spring 26 ... Fuel inlet cylinder 30 ... Coil
31 ... Coil housing 33 ... Coupler terminal 34 ... Coupler 37 ... Stopper member

Claims (5)

A housing (2) in which a magnetic cylindrical body (4), a non-magnetic cylindrical body (6), and a fixed core (5) are successively connected in the axial direction, and a suction surface of the fixed core (5) in the housing (2) ( A movable core (12) that can reciprocate between an operating position that abuts on 5a) and a retracted position that is separated from the suction surface (5a), and a return spring that biases the movable core (12) toward the retracted position ( 22), the coil (30) disposed on the outer periphery of the fixed core (5), and the magnetic cylinder (4) and the fixed core (5) that accommodate this coil (30), The coil housing ( 31 ) that forms a magnetic circuit together with the magnetic cylindrical body (4) and the fixed core (5) when energized (30), and the coil housing ( 31 ) are formed on one side of the coil housing ( 31 ). Made of synthetic resin that accommodates and supports the coupler terminal (33) Coupler (34) and an actuating member (14) connected to the movable core (12). When the magnetic circuit is formed, the movable core (12) is attracted to the attracting surface of the fixed core (5). , In an electromagnetic actuator that abuts to regulate the operating limit of the actuating member (14),
An electromagnetic actuator, wherein the fixed core (5) is made of a Fe-Al alloy having a specific gravity of 7.2 or less and permeability. The electromagnetic actuator according to claim 1,
An electromagnetic actuator characterized in that the movable core (12) is made of a Fe-Al alloy having a specific gravity of 7.2 or less and permeability. A valve seat member (3) having a valve seat (8) and a valve hole (7) at the front end, a magnetic cylindrical body (4), a nonmagnetic cylindrical body (6), a fixed core (5), and a fuel inlet cylinder (26). A valve housing (2) connected in the axial direction and having an inside as a fuel flow path, an operating position in contact with the suction surface (5a) of the fixed core (5) in the valve housing (2), and the suction surface (5a A movable core (12) capable of reciprocating between the retreat positions separated from each other), a return spring (22) for urging the movable core (12) toward the retreat position, and an outer periphery of the fixed core (5). The coil (30) to be installed, and the magnetic cylinder (4) and the fixed core (5) that house the coil (30) are connected between the magnetic cylinder (4) and the coil (30) when energized. ) and with the fixed core (5) and coil housing forming a magnetic circuit (31), the coil housing 31) formed on one side of the coil (made of a synthetic resin coupler for receiving and supporting the coupler pin (33) continuous to 30) (34), coupled to the movable core (12), the movable core (12) And a valve body (14) for opening and closing the valve hole (7) by the reciprocating movement of the movable core (12), and when forming the magnetic circuit, the movable core (12) is placed on the suction surface (5a) of the fixed core (5). In an electromagnetic fuel injection valve that restricts the valve opening limit of the valve element (14) by suction and contact,
An electromagnetic fuel injection valve characterized in that the fixed core (5) is made of a Fe-Al alloy having a specific gravity of 7.2 or less and permeability. The electromagnetic fuel injection valve according to claim 3,
On the suction surface (12b) of the movable core (12) opposed to the suction surface (5a) of the fixed core (5), the valve element (14) is allowed to open by contacting the suction surface (5a). An electromagnetic fuel injection characterized in that a restricting ring-shaped stopper member (37) is protruded, and the stopper member (37) is made of a Fe-Al alloy having a specific gravity of 7.2 or less and permeability. valve. The electromagnetic fuel injection valve according to claim 3 or 4,
An electromagnetic fuel injection valve characterized in that the movable core (12) is made of a Fe-Al alloy having a specific gravity of 7.2 or less and permeability.

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