JP2010031674A - Electromagnetic fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic fuel injection valve allowing a seal groove for attachment of an O-ring to be easily formed in a rear end outer periphery of a fuel inlet tube without forming a flange at a rear end of the fuel inlet tube. <P>SOLUTION: A filter body 36 having an outer flange portion 36b is joined with a reinforcing metal collar 38 which is formed of a small cylindrical part 38a buried in the outer periphery of a bottomed cylindrical part 36a of the filter body and an inner flange part 38b radially expanding from an end of the small cylindrical part and closely contacting with an outer flange part 36b. The inner and outer flange parts 36b, 38b are projected radially outward from an outer periphery of the fuel inlet tube 26 with the small cylindrical part 38a of the reinforcing collar 38 press-fitted into a rear end inner periphery of the fuel inlet tube 26 and with the inner flange part 38b of the reinforcing collar butted against a rear end face of the fuel inlet tube 26 so that the seal groove 50 is defined by the inner flange part 38b and a rear end face 32a of a synthetic resin coated body 32 facing it. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic fuel injection valve mainly used for a fuel supply system of an internal combustion engine, and in particular, via a valve seat member at a front end portion, a hollow fixed core at an intermediate portion, and a hollow portion of a fixed core at a rear end portion. A valve body that can be seated on the valve seat of the valve seat member in a valve housing having a metal fuel inlet tube communicating with the valve seat member; A movable core that operates to open the housing is housed, and a fuel filter is attached to the rear end of the fuel inlet cylinder, and a coil that can excite it is disposed on the outer periphery of the fixed core, and this coil is embedded. Thus, the present invention relates to an improvement in an electromagnetic fuel injection valve in which the outer periphery of a valve housing is covered with a cover made of synthetic resin.

Such an electromagnetic fuel injection valve is already known as disclosed in Patent Document 1 below.
JP 2003-328901 A

  In the conventional electromagnetic fuel injection valve, a flange is formed at the rear end of the metal fuel inlet cylinder, and the flange and the rear end of the synthetic resin coating facing the flange are connected to the fuel inlet cylinder. An annular seal groove having an outer peripheral surface as a bottom surface is defined, and an O-ring that is in close contact with the inner peripheral surface of the fuel distribution cap fitted to the outer periphery of the rear end portion of the fuel inlet cylinder is attached to the seal groove. .

  In such a conventional electromagnetic fuel injection valve, naturally, the rear end portion of the fuel inlet cylinder needs to be flanged, which affects the cost.

  The present invention has been made in view of such circumstances, and a fuel filter attached to the rear end portion of the fuel inlet cylinder can be used without forming a flange at the rear end portion of the fuel inlet cylinder. An object of the present invention is to provide a low-cost electromagnetic fuel injection valve in which an annular seal groove for mounting an O-ring can be easily formed on the outer periphery of the rear end portion of the fuel inlet cylinder.

  To achieve the above object, the present invention provides a metal fuel inlet that communicates with a valve seat member through a valve seat member at a front end portion, a hollow fixed core at an intermediate portion, and a hollow portion of the fixed core at a rear end portion. A valve body that can be seated on a valve seat of a valve seat member and a movable core that is connected to the valve body and that operates to open the valve body when sucked by a fixed core are accommodated in a valve housing having a cylinder. At the same time, a fuel filter is attached to the rear end of the fuel inlet cylinder, and a coil that can excite the fuel filter is disposed on the outer periphery of the fixed core, and the outer periphery of the valve housing is covered with a synthetic resin so that the coil is embedded. In an electromagnetic fuel injection valve coated with a body, a filter body made of synthetic resin for a fuel filter is supported by a bottomed cylindrical portion that is inserted into a fuel inlet cylinder while supporting a filter net, It consists of an outer flange that extends radially from the open end. The filter body includes a small cylindrical portion embedded in the outer peripheral surface of the bottomed cylindrical portion, and an inner flange portion that spreads radially from one end of the small cylindrical portion and is in close contact with the inner end surface of the outer flange portion. A metal reinforcing collar is joined by insert molding, and a small cylindrical portion of this reinforcing collar is press-fitted into the inner peripheral surface of the rear end portion of the fuel inlet tube, and its inner flange is abutted against the rear end surface of the fuel inlet tube, and the inner side And the outer flange portion projecting radially outward from the outer peripheral surface of the fuel inlet cylinder, and the outer peripheral surface of the fuel inlet cylinder is defined as the bottom surface by the inner flange portion and the rear end surface of the covering facing the inner flange portion. An annular seal groove is defined, and an O-ring that is in close contact with the inner peripheral surface of the fuel distribution cap fitted to the outer periphery of the rear end of the fuel inlet cylinder is attached to the seal groove, and the small cylindrical portion and the The coupling strength between the fuel inlet cylinders A first feature that is set larger than the axial removing load of the fuel dispensing cap from the O-ring.

  According to the present invention, in addition to the first feature, the outer flange portion is integrally formed with an annular covering portion covering the outer peripheral surface of the inner flange portion, and the outer peripheral edge portion of the covering portion is chamfered. The formation is a second feature.

  According to the first feature of the present invention, the inner flange portion of the reinforcing collar of the fuel filter that is press-fitted into the inner peripheral surface of the rear end portion of the fuel inlet cylinder having no flange, and the synthetic resin covering the outer peripheral surface of the valve housing. Since the seal groove for mounting the O-ring is defined by the rear end face of the cover, the seal groove can be easily formed on the outer periphery of the fuel inlet cylinder without applying flange processing to the rear end of the fuel inlet cylinder. Can do. Therefore, it is not necessary to perform special flange processing for forming the seal groove at the rear end portion of the fuel inlet cylinder, and the cost of the electromagnetic fuel injection valve can be reduced.

  In addition, since the coupling strength by press-fitting between the fuel inlet cylinder and the small cylindrical portion of the reinforcing collar is set to be larger than the axial separation load of the fuel distributing cap from the O-ring, when the fuel distributing cap is detached, the reinforcing collar That is, the fuel filter can continue to hold the O-ring without detaching from the fuel inlet tube.

  Further, when the fuel distribution cap is detached, the outer flange portion of the filter body is in close contact with the inner flange portion that receives the axial load from the O-ring. The inner and outer flange portions can be prevented from being deformed.

  According to the second feature of the present invention, the outer flange portion is formed with an annular covering portion covering the outer peripheral surface of the inner flange portion, and the outer peripheral edge portion of the covering portion is chamfered. When mounting the ring to the seal groove from the outside of the outer flange part, the O-ring can be smoothly mounted by expanding the diameter smoothly along the chamfer of the outer peripheral edge of the synthetic resin cover. In this case, since the O-ring is disconnected from the peripheral edge of the metal inner flange portion by the covering portion, damage due to the contact can be prevented.

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

  FIG. 1 is a longitudinal sectional view of an electromagnetic fuel injection valve according to the present invention, and FIG. 2 is an enlarged view of part 2 of FIG.

  In FIG. 1, a valve housing 2 of a fuel injection valve I includes a cylindrical valve seat member 3 having a valve seat 8 at a front end portion thereof, and is press-fitted into an outer peripheral surface of a rear end portion of the valve seat member 3 to be liquid-tightly welded. The movable core housing cylinder 4 made of a magnetic material, the nonmagnetic cylinder 6 coaxially and liquid-tightly welded to the rear end of the movable core housing cylinder 4, and the inner peripheral surface of the nonmagnetic cylinder 6 The fixed core 5 is fixed to the fixed core 5 and the fuel inlet tube 26 is coaxially connected to the rear end of the fixed core 5.

  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 fixed to the vertical hole 21 and the spring seat 24. The valve spring 22 is retracted between the valve assembly V and the valve assembly V, and the valve assembly 16 is urged in the seating direction of the valve seat 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 front end portion of the stopper member 14 in the press-fitting direction is reduced in diameter so as to induce press-fitting into the movable core 12. The valve spring 22 is disposed so as to penetrate the hollow portion of the stopper member 14 and be slidably supported by the reduced diameter 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.

  As clearly shown in FIG. 2, a flange 4 a is integrally formed at the front end of the movable core housing cylinder 4 so that the front end of the connecting cylinder 31 a contacts and is welded.

  An injector plate 10 having a plurality of fuel injection holes communicating with the valve hole 7 is joined to the front end surface of the valve seat member 3 in a liquid-tight manner 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 to the outer periphery of the valve seat member 3 and the flange 4a. 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.

  The fuel inlet cylinder 26 is made of a pipe material having no flange, and the front end portion thereof is fitted to the outer peripheral surface of the rear end portion of the fixed core 5 and is liquid-tightly welded. The inside of the fuel inlet tube 26 communicates with the retainer 23.

  A hard synthetic resin coating 32 is formed on the outer peripheral surface of the coil housing 31 from the latter half of the coil housing 31 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.

  Next, as shown in FIG. 2, a fuel filter 27 is attached to the rear end portion of the fuel inlet tube 26. The fuel filter 27 includes a filter body 36 made of synthetic resin and a filter net 37 supported by the filter body 36. The filter main body 36 is composed of a bottomed cylindrical portion 36a inserted into the fuel inlet cylinder 26 and a disk-shaped outer flange portion 36b extending radially from the open end of the bottomed cylindrical portion 36a with a synthetic resin. A plurality of window holes 36c are provided on the outer periphery of the bottomed cylindrical portion 36a, and a filter screen 37 is joined to the bottomed cylindrical portion 36a by insert molding so as to cover the window holes 36c. A metal reinforcing collar 38 is coupled to the filter body 36 by insert molding. The reinforcing collar 38 includes a small cylindrical portion 38a embedded in the outer peripheral surface of the base portion of the bottomed cylindrical portion 36a while avoiding the window hole 36c, and the outer flange portion 36b extending radially from one end of the small cylindrical portion 38a. An annular anchor portion 38c that bites into the bottomed cylindrical portion 36a is provided at the other end of the small cylindrical portion 38a. The reinforcing collar 38 is formed by pressing a pipe material, and an inner corner 39 between the small cylindrical portion 38a and the inner flange portion 38b is rounded, thereby causing wrinkles at the inner corner 39. In addition to being suppressed, the strength of the inner corner 39 is ensured.

  When the reinforcing collar 38 is joined to the filter body 36 by insert molding, an annular covering portion 40 that covers the outer peripheral surface of the inner flange portion 38b of the reinforcing collar 38 is integrally formed on the outer flange portion 36b of the filter body 36. In this case, a chamfer 40 a is formed on the outer peripheral edge of the covering portion 40.

  Thus, when the fuel filter 27 is attached to the fuel inlet cylinder 26, the small cylindrical portion 38a of the reinforcing collar 38 is press-fitted into the inner peripheral surface of the rear end portion of the fuel inlet cylinder 26. At this time, the inner flange portion 38 b of the reinforcing collar 38 is abutted against the rear end surface of the fuel inlet tube 26 and projects radially from the outer peripheral surface of the fuel inlet tube 26. On the other hand, a chamfer 26a is formed on the inner peripheral edge of the rear end portion of the fuel inlet cylinder 26 so as not to interfere with the rounded inner corner 39. The cover 32 is integrally formed with a stopper 32b for restricting the depth of press-fitting of the fuel distribution cap 52a into the fuel inlet cylinder 26.

  The inner flange portion 38b that protrudes from the outer peripheral surface of the fuel inlet cylinder 26 and the covering portion 40 that covers the outer peripheral surface cooperate with the rear end surface 32a of the covering body 32 so that the outer peripheral surface of the fuel inlet cylinder 26 becomes the bottom surface. An annular seal groove 50 having a channel shape is defined, and an O-ring 51 made of an elastic material is attached to the seal groove 50 from the outside of the outer flange portion 36b. When mounting, the O-ring 51 is expanded in diameter so that it exceeds the outer and inner flange portions 36b, 38b toward the seal groove 50 side.

  After the O-ring 51 is installed in the seal groove 50, the fuel distribution cap 52a of the fuel rail 52 to which high pressure fuel is supplied from a fuel pump (not shown) is fitted in the axial direction on the outer periphery of the rear end portion of the fuel inlet cylinder 26. The At that time, the O-ring 51 is pushed into the seal groove 50 by the inner peripheral surface of the fuel distribution cap 52a, so that it is elastically deformed into an elliptical cross section, and the repulsive force causes the three wall surfaces of the seal groove 50 (the fuel inlet cylinder 26). , The rear end surface 32a of the covering body 32 and the inner end surface of the inner flange portion 38b) and the inner peripheral surface of the fuel distribution cap 52a.

  In the above, the coupling strength due to the press-fitting between the small cylindrical portion 38a and the fuel inlet cylinder 26 is set larger than the axial separation load of the fuel distribution cap 52a from the O-ring 51.

  Further, the diameter D2 of the outer flange portion 36b, that is, the diameter D2 of the covering portion 40 is larger than the diameter D1 of the imaginary circle passing through the center 54 of the cross section in the free state of the O-ring 51 and smaller than the inner diameter D3 of the fuel distribution cap 52a. Is set.

  Next, the operation of this embodiment will be described.

  During operation of the engine, high-pressure fuel supplied from the fuel pump to the fuel rail 52 is distributed to the fuel inlet cylinder 26 of the electromagnetic fuel injection valve I through the fuel distribution cap 52a. After being filtered, the fixed core 5, the hollow portion of the valve assembly V and 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.

  Meanwhile, in the fitting portion between the fuel inlet cylinder 26 and the fuel distribution cap 52a, the O-ring 51 mounted in the seal groove 50 on the outer periphery of the fuel inlet cylinder 26 is connected to the three wall surfaces of the seal groove 50 and the inner periphery of the fuel distribution cap 52a. Since the fitting portion between the fuel inlet cylinder 26 and the fuel distribution cap 52a is sealed in close contact with the surface, fuel leakage can be reliably prevented from the fitting portion.

  By the way, the seal groove 50 covers the inner flange portion 38b of the reinforcing collar 38 of the fuel filter 27 press-fitted into the inner peripheral surface of the rear end portion of the fuel inlet cylinder 26 having no flange and the outer peripheral surface of the valve housing 2 in a wide range. Since it is defined by the rear end surface 32a of the covering body 32 made of synthetic resin, the sealing groove 50 is simply formed on the outer periphery of the fuel inlet cylinder 26 without performing flange processing on the rear end portion of the fuel inlet cylinder 26. can do. Therefore, it is not necessary to perform special flange processing for forming the seal groove 50 at the rear end portion of the fuel inlet tube 26, and the cost of the electromagnetic fuel injection valve I can be reduced.

  For inspection and maintenance of the electromagnetic fuel injection valve I, when the fuel distribution cap 52a is removed from the fuel inlet cylinder 26 in the axial direction, the axial direction of the fuel distribution cap 52a is caused by the frictional resistance between the fuel distribution cap 52a and the O-ring 51. Is applied from the O-ring 51 to the inner flange portion 38 b of the reinforcing collar 38. However, since the coupling strength by press-fitting between the fuel inlet cylinder 26 and the small cylindrical portion of the reinforcing collar 38 is set larger than the axial separation load of the fuel distribution cap 52a from the O-ring 51, the reinforcing collar 38, that is, The fuel filter 27 can continue to hold the O-ring 51 without being detached from the fuel inlet cylinder 26, and only the fuel distribution cap 52 a is detached from the fuel inlet cylinder 26. Therefore, after inspection and maintenance of the electromagnetic fuel injection valve I, the fuel distribution cap 52a can be easily refitted to the fuel inlet cylinder 26.

  Further, since the outer flange portion 36b of the filter body 36 is in close contact with the inner flange portion 38b that receives the axial load from the O-ring 51 when the fuel distribution cap 52a is detached, the inner and outer flange portions 36b, 38b are in close contact with each other. Cooperate to support the axial load, and deformation of the inner and outer flange portions 36b, 38b can be prevented.

  Further, the diameters D2 and D3 of the outer and inner flange portions 36b and 38b are larger than the diameter D1 of an imaginary circle passing through the center 54 of the cross section in the free state of the O-ring 51, and of the fuel distribution cap 52a. Since it is set smaller than the inner diameter D4, the outer and inner flange portions 36b, 38b avoid the interference with the fuel distribution cap 52a, and when the fuel distribution cap 52a is detached from the fuel inlet cylinder 26, the outer side of the O-ring 51 is removed. And escape from inner side flange parts 36b and 38b can be prevented reliably.

  Further, the outer flange portion 36 b of the filter body 36 is formed with an annular covering portion 40 that covers the outer peripheral surface of the inner flange portion 38 b of the reinforcing collar 38, and a chamfer is formed at the outer peripheral edge portion of the covering portion 40. Therefore, when the O-ring 51 is attached to the seal groove 50 from the outside of the outer flange portion 36b, the O-ring 51 is smoothly expanded in diameter along the chamfer 40a of the outer peripheral edge portion of the synthetic resin covering portion 40, Mounting can be performed easily. In addition, at that time, the O-ring 51 is disconnected from the peripheral edge portion of the metal inner flange portion 38b by the covering portion 40, so that damage due to the contact can be prevented.

  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 fuel inlet tube 26 can be formed integrally with the fixed core 5.

The longitudinal cross-sectional view of the electromagnetic fuel injection valve which concerns on this invention. FIG. 2 is an enlarged view of part 2 of FIG. 1.

Explanation of symbols

I ... Electromagnetic fuel injection valve 2 ... Valve housing 3 ... Valve seat member 5 ... Fixed core 8 ... Valve seat 12 ... Movable Core 16 ... Valve 26 ... Fuel inlet cylinder 27 ... Fuel filter 30 ... Coil 32 ... Coating 36 ... Filter body 36a ... Cylinder with bottom Part 36b ... outer flange part 37 ... filter net 38 ... reinforcement collar 38a ... small cylindrical part 38b ... inner flange part 40 ... covering part 40a ... chamfer 50 ... Seal groove 51 ... O-ring 52 ... Fuel rail 52a ... Fuel distribution cap 54 ... O-ring cross-sectional center

Claims (2)

Metal fuel inlet communicating with the valve seat member (3) through the valve seat member (3) at the front end portion, the hollow fixed core (5) at the middle portion, and the hollow portion of the fixed core (5) at the rear end portion A valve body (16) that can be seated on a valve seat (8) of a valve seat member (3) in a valve housing (2) having a cylinder (26), and a fixed core ( 5) The movable core (12) that operates to open the valve element (16) when accommodated is accommodated, and a fuel filter (27) is attached to the rear end of the fuel inlet cylinder (26) and fixed. A coil (30) capable of exciting the core (5) is disposed on the outer periphery of the core (5), and the outer periphery of the valve housing (2) is covered with a synthetic resin covering (32) so as to embed the coil (30). In a coated electromagnetic fuel injection valve,
A bottom body cylindrical portion (36a) for inserting a filter body (36) made of synthetic resin of the fuel filter (27) into the fuel inlet cylinder (26) while supporting the filter net (37), and the bottom cylinder A small cylinder embedded in the outer peripheral surface of the bottomed cylindrical portion (36a) is formed by an outer flange portion (36b) extending radially from the open end of the portion (36a). A metal reinforcing collar (38) comprising a portion (38a) and an inner flange portion (38b) that extends radially from one end of the small cylindrical portion (38a) and is in close contact with the inner end face of the outer flange portion (36b) Are joined by insert molding, the small cylindrical portion (38a) of the reinforcing collar (38) is press-fitted into the inner peripheral surface of the rear end portion of the fuel inlet tube (26), and the inner flange portion (38b) is inserted into the fuel inlet tube ( 26) Butt against the rear end face The inner and outer flange portions (36b, 38b) project radially outward from the outer peripheral surface of the fuel inlet tube (26), and the inner flange portion (38b) and the covering body (32) opposed thereto. The rear end surface (32a) defines an annular seal groove (50) having the outer peripheral surface of the fuel inlet tube (26) as a bottom surface. The seal groove (50) includes the fuel inlet tube (26). An O-ring (51) that is in close contact with the inner peripheral surface of the fuel distribution cap (52a) fitted to the outer periphery of the rear end portion is attached, and the coupling strength between the small cylindrical portion (38a) and the fuel inlet tube (26) is increased. The electromagnetic fuel injection valve is characterized in that it is set larger than the axial separation load of the fuel distribution cap (52a) from the O-ring (51). The electromagnetic fuel injection valve according to claim 1,
The outer flange portion (36b) is integrally formed with an annular covering portion (40) covering the outer peripheral surface of the inner flange portion (38b), and the outer peripheral edge portion of the covering portion (40) is chamfered (40a ) Is formed. An electromagnetic fuel injection valve.

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