JP2007285283A - Fuel injection valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection valve capable of reducing operating noise, in spite of having a simple structure. <P>SOLUTION: A cylindrical member 23 forming a thick wall is provided on the end nearer to a fuel inlet 15 of an accommodating pipe 11. Vibration of an injector propagating along the accommodating pipe 11 is damped, when the vibration propagates through a second magnetic part 14 to then reach the thick wall formed by the cylindrical member 23, at which a wall thickness of the accommodating pipe 11 is sharply increased. In other words, the vibration propagating along the accommodating pipe 11 is damped by reaching the thick wall formed by the cylindrical member 23. Thus, if the end nearer to the fuel inlet 15 of the injector is connected to a fuel rail for supplying fuel, vibration propagating from the injector to the fuel rail is reduced. As a result, vibration, operating noise, and other noise emitted from the fuel rail to the outside can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel injection valve that injects fuel, and is suitably applied to, for example, a fuel injection valve for an internal combustion engine.

  Conventionally, a fuel injection valve that electromagnetically drives a valve member is known. In such a fuel injection valve, the valve member and the movable core integrally move reciprocally in the axial direction. The valve member intermittently injects fuel by being seated on or separated from the valve seat provided in the housing. The movable core integral with the valve member is sucked by the fixed core at the end opposite to the valve seat. In the case of the fuel injection valve having such a configuration, during operation, operation noise is generated due to a collision between the valve member and the valve seat of the housing and a collision between the movable core and the fixed core.

Thus, for example, in the case of the fuel injection valve disclosed in Patent Document 1, noise is reduced by reducing the weight of the valve member. In addition, in the case of the fuel injection valve disclosed in Patent Document 2, noise is reduced by providing an elastic member serving as a soundproof cover on the outside.
JP 2004-239245 A JP 2005-240731 A

However, even if the valve member is reduced in weight as disclosed in Patent Document 1 or a soundproof cover is attached as disclosed in Patent Document 2, it is difficult to fundamentally reduce the operating noise. It is. On the other hand, these conventional techniques have a problem that the structure becomes complicated.
Accordingly, an object of the present invention is to provide a fuel injection valve that reduces operating noise with a simple structure.

  According to the first aspect of the present invention, the end portion of the housing is provided with a thick portion. Vibration generated in the fuel injection valve, such as a collision between the valve member and the valve seat and a collision between the movable core and the fixed core, propagates through the housing and reaches the end opposite to the opening of the housing. The end of the fuel injection valve opposite to the opening is connected to a fuel rail for supplying fuel. Therefore, the vibration propagated through the housing is transmitted to the connected fuel rail, and is emitted to the outside as vibration and sound from the fuel rail. By the way, in general, vibration propagating through a member is attenuated when the cross-sectional area of the member through which the vibration is transmitted suddenly increases. As described above, the vibration propagating through the housing is transmitted to the fuel rail. Therefore, the vibration transmitted to the fuel rail can be reduced by attenuating the vibration on the side closest to the fuel rail, that is, the end opposite to the opening of the housing. According to the first aspect of the present invention, the vibration propagated through the housing is attenuated at the thick portion by providing the thick portion at the end on the side opposite to the opening of the housing. Therefore, vibrations and sounds emitted to the outside with a simple structure, and operating sounds can be reduced.

In the invention according to claim 2, the thick part is formed by the cylindrical member. Therefore, by providing the cylindrical member, a thick part is easily formed at the end of the housing. Therefore, the operation sound can be reduced with a simple structure.
In the invention according to claim 3, the tubular member supports the filter member. In the fuel passage, it is necessary to install a filter member for removing foreign substances contained in the inflowing fuel. Further, the filter member has a portion for installation on the inner peripheral side of the housing, for example, by press fitting. Therefore, by forming the part for installing the filter member in the housing with a cylindrical member, the thick part is provided while supporting the filter member without increasing the number of parts. Therefore, the operation noise can be reduced with a simple structure without increasing the number of parts.

In the invention according to claim 4, the cylindrical member is formed of a material having a vibration damping rate larger than that of the housing. Thereby, the vibration propagated through the housing is effectively damped by the cylindrical member having a large vibration damping rate. Therefore, the operation can be reduced with a simple structure.
In the invention of claim 5, the inner diameter of the cylindrical member is larger than the inner diameter of the adjusting pipe. The fuel flows into the opening via the inner peripheral side of the cylindrical member, the inner peripheral side of the housing, the inner peripheral side of the fixed core, the inner peripheral side of the adjusting pipe, the inner peripheral side of the movable core, and the like. Since the adjusting pipe is press-fitted into the inner peripheral side of the fixed core, the inner diameter is the smallest among the members forming the passage through which the fuel flows. Therefore, by setting the inner diameter of the cylindrical member to be larger than the inner diameter of the adjusting pipe, the resistance of the cylindrical member to the fuel flow is reduced. Therefore, the pressure loss of the fuel can be reduced.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
In the following plurality of embodiments, substantially the same components are denoted by the same reference numerals, and description in each embodiment is omitted.
(First embodiment)
FIG. 1 shows a fuel injection valve (hereinafter referred to as “injector”) according to a first embodiment of the present invention. The injector 10 according to the first embodiment injects fuel into, for example, intake air sucked into a combustion chamber of a gasoline engine. The injector 10 may be applied to other types of engines such as a direct injection type gasoline engine that directly injects fuel into a combustion chamber of a gasoline engine, or a diesel engine.

  The injector 10 includes a housing pipe 11. The accommodation pipe 11 is formed in a thin cylindrical shape. The accommodation pipe 11 has a first magnetic part 12, a nonmagnetic part 13, and a second magnetic part 14. The nonmagnetic part 13 prevents a magnetic short circuit between the first magnetic part 12 and the second magnetic part 14. The housing pipe 11 has a fuel inlet 15 at one end. The end of the injector 10 on the fuel inlet 15 side is connected to the fuel rail 100. Fuel is supplied to the fuel rail 100 from a fuel pump (not shown). The fuel supplied from the fuel pump to the fuel rail 100 flows into the injector 10 from the fuel inlet 15. A fuel filter 20 is installed at the end of the accommodation pipe 11 on the fuel inlet 15 side. The fuel filter 20 includes a mesh-like mesh portion 21 and a support portion 22 that supports the mesh portion 21. The mesh portion 21 is made of, for example, metal or resin. The mesh portion 21 is supported by the support portion 22 and held by the accommodation pipe 11. As a result, the fuel filter 20 removes foreign matters contained in the fuel at the end on the fuel inlet 15 side. The injector 10 and the fuel rail 100 are liquid-tightly sealed by a ring 101 that is a seal member.

  A valve body 30 is installed on the side of the housing pipe 11 opposite to the fuel inlet 15, that is, on the inner peripheral side of the first magnetic part 12. The valve body 30 is formed in a substantially cylindrical shape and is fixed to the inner peripheral side of the first magnetic part 12. As shown in FIG. 2, the valve body 30 has a valve seat 32 on a conical inner wall surface 31 whose inner diameter decreases as it approaches the tip. The valve body 30 has an opening 33 at the end of the inner wall surface 31 opposite to the accommodation pipe 11. A nozzle hole plate 34 is provided at the end of the valve body 30 opposite to the housing pipe 11. The nozzle hole plate 34 covers the outside of the opening 33 of the valve body 30. The nozzle hole plate 34 has a nozzle hole 35 that connects an end face on the valve body 30 side and an end face on the opposite side of the valve body 30. The side opposite to the valve body 30 of the nozzle hole plate 34, that is, the outer side of the nozzle hole plate 34 is covered with a sleeve 36. The sleeve 36 covers the outside of the nozzle hole plate 34 and holds the nozzle hole plate 34 in the valve body 30. The accommodation pipe 11 and the valve body 30 described above constitute a housing in the claims.

  The needle 40 as a valve member is accommodated in the first magnetic part 12 of the accommodating pipe 11 and the inner peripheral side of the valve body 30 so as to be capable of reciprocating in the axial direction. The needle 40 is disposed substantially coaxially with the accommodating pipe 11 and the valve body 30. The needle 40 has a seal portion 41 in the vicinity of the end portion on the nozzle hole plate 34 side. The seal portion 41 can be seated on a valve seat 32 formed on the valve body 30. The needle 40 forms a fuel passage 42 through which fuel flows between the needle body 40 and the valve body 30. When the seal portion 41 of the needle 40 is separated from the valve seat 32, the fuel passage 42 and the injection hole 35 communicate with each other via the opening 33. In the case of this embodiment, the needle 40 is formed in a cylindrical shape. Therefore, the needle 40 has a fuel passage 43 formed therein. The needle 40 has a fuel hole 44 and a fuel hole 45 that connect the fuel passage 42 and the fuel passage 43. The needle 40 is not limited to a cylindrical shape, and may be a solid column shape.

  The injector 10 has a drive unit 50 that drives the needle 40 as shown in FIG. The drive unit 50 is an electromagnetic drive unit. The drive unit 50 includes a coil unit 51, a plate housing 52, a holder 53, a fixed core 54, and a movable core 55. The plate housing 52 and the holder 53 are both made of a magnetic material and are magnetically connected to each other. The plate housing 52 covers the outer peripheral side of the coil portion 51. The holder 53 is disposed on the outer peripheral side of the housing pipe 11 and holds the coil portion 51 from the nozzle hole 35 side. The outer peripheral side of the coil portion 51, the plate housing 52, the holder 53 and the housing pipe 11 is covered with a resin mold 56. The coil portion 51 is electrically connected to a terminal 59 installed on the connector 58 via the wiring member 57.

  The fixed core 54 is fixed to the inner peripheral side of the coil portion 51 with the accommodation pipe 11 interposed therebetween. The fixed core 54 is formed in a substantially cylindrical shape by a magnetic material such as iron. The fixed core 54 is installed with a predetermined gap between the fixed core 54 and the movable core 55. The gap between the fixed core 54 and the movable core 55 corresponds to the lift amount of the needle 40.

  The movable core 55 is accommodated on the inner peripheral side of the accommodation pipe 11. The movable core 55 can reciprocate in the axial direction on the inner peripheral side of the housing pipe 11. The end of the movable core 55 opposite to the injection hole 35 faces the fixed core 54. The movable core 55 is formed in a substantially cylindrical shape from a magnetic material such as iron. The end of the needle 40 opposite to the seal portion 41 is fixed to the inner peripheral side of the movable core 55. Thereby, the needle 40 and the movable core 55 are reciprocated in the axial direction as a unit.

  The movable core 55 is in contact with the spring 16 as an elastic member. The spring 16 has one end in the axial direction in contact with the movable core 55 and the other end in contact with the adjusting pipe 17. The adjusting pipe 17 is fixed to the inner peripheral side of the fixed core 54 by, for example, press fitting. The spring 16 has a force that extends in the axial direction. Therefore, the spring 16 having one end fixed by the adjusting pipe 17 presses the integral movable core 55 and the needle 40 toward the valve seat 32 on the other end side. The load of the spring 16 is adjusted by the press-fitting amount of the adjusting pipe 17 into the fixed core 54. When the coil portion 51 is not energized, the integral movable core 55 and the needle 40 are pressed against the valve seat 32 side. Thereby, the seal portion 41 is seated on the valve seat 32.

  As shown in FIG. 3, a fuel filter 20 is installed at the end of the accommodation pipe 11 on the fuel inlet 15 side. The fuel filter 20 is held by the housing pipe 11 while being locked to the cylindrical member 23. A support portion 22 of the fuel filter 20 is locked to the cylindrical member 23. The cylindrical member 23 to which the support portion 22 of the fuel filter 20 is locked is press-fitted together with the fuel filter 20 to the inner peripheral side of the housing pipe 11. Thereby, the fuel filter 20 is fixed to the end of the accommodating pipe 11 on the fuel inlet 15 side, that is, the end opposite to the opening 33 together with the cylindrical member 23.

  The cylindrical member 23 is formed in a cylindrical shape having a fuel passage 24 on the inner peripheral side. By fixing the cylindrical member 23 to the end of the accommodating pipe 11 on the fuel inlet 15 side, the thickness of the accommodating pipe 11 increases at the portion where the cylindrical member 23 is provided. That is, the accommodating pipe 11 has a substantially uniform thickness from the vicinity of the fixed core 54 to the vicinity of the end portion on the fuel inlet 15 side, while the thickness of the accommodating pipe 11 is rapidly increased by the cylindrical member 23 at the fuel inlet 15. Thereby, the cylindrical member 23 forms a thick portion at the end of the accommodation pipe 11 on the fuel inlet 15 side.

  By forming the thick part in the accommodation pipe 11 with the cylindrical member 23, the vibration propagating from the second magnetic part 14 located on the fixed core 54 side of the cylindrical member 23 to the cylindrical member 23 side forming the thick part is attenuated. To do. In general, the vibration transmitted from the thin side to the thick side is attenuated as indicated by a propagation attenuation amount ΔR obtained by the following equation (1). Here, σ is obtained by S2 / S1, where S1 is the cross-sectional area of the thin member, and S2 is the cross-sectional area of the thick member. Thus, the vibration propagated on the thin wall side is attenuated when propagating to the thick wall side where the wall thickness suddenly increases.

  In the case of the first embodiment, the wall thickness of the accommodation pipe 11 changes abruptly between the second magnetic part 14 and the cylindrical member 23 fixed to the second magnetic part 14. Therefore, the vibration propagated through the second magnetic portion 14 is attenuated at the portion where the cylindrical member 23 is fixed. In particular, when the second magnetic portion 14 of the housing pipe 11 is formed of stainless steel, the cylindrical member 23 is formed of a material having a large vibration damping rate compared to stainless steel, such as iron or rubber, so that the second magnetic portion 14 is formed. The vibration propagated through the portion 14 is greatly attenuated by the cylindrical member 23. The cylindrical member 23 is not limited to iron or rubber exemplified above, but may be made of a material having a large vibration damping rate compared to the housing pipe 11 such as other metals or resins.

  When the injector 10 is operated, the needle 40 and the valve body 30, and the movable core 55 and the fixed core 54 are repeatedly collided due to intermittent energization of the coil portion 51. Thereby, the vibration generated by the collision between the needle 40 and the valve body 30 and the movable core 55 and the fixed core 54 propagates through the second magnetic portion 14 of the accommodation pipe 11. The injector 10 is connected to the fuel rail 100 at the end on the fuel inlet 15 side as described above. Therefore, the vibration propagated through the second magnetic portion 14 of the accommodation pipe 11 further propagates to the fuel rail 100 and is released from the fuel rail 100 to the outside as vibration and noise. On the other hand, in the case of the first embodiment, vibration propagating through the accommodation pipe 11 is attenuated at the end of the accommodation pipe 11 near the fuel rail 100 on the fuel inlet 15 side. Thereby, vibration propagating from the accommodation pipe 11 to the fuel rail 100 is greatly reduced. As a result, vibration and noise released from the fuel rail 100 to the outside are reduced.

  The inner diameter of the cylindrical member 23 forming the fuel passage 24 is larger than the inner diameter of the adjusting pipe 17. The fuel that is supplied to the fuel inlet 15 and flows into the inner peripheral side of the accommodating pipe 11 from the fuel passage 24 formed by the cylindrical member 23 is the inner peripheral side of the adjusting pipe 17, the inner peripheral side of the fixed core 54, and the movable core 55. The fuel flows into the fuel passage 44 via the inner peripheral side, the fuel passage 43 formed by the needle 40, and the fuel holes 44 and 45. The fuel flowing from the fuel inlet 15 to the fuel passage 44 is narrowed down at the smallest diameter portion. In the first embodiment, the narrowing of the fuel flow in the fuel passage 24 is reduced by making the inner diameter of the cylindrical member 24 larger than the inner diameter of the adjusting pipe 17. Therefore, even if the cylinder member 23 is installed, the pressure loss of the fuel can be reduced.

Next, the operation of the injector 10 having the above configuration will be described.
When the coil portion 51 is not energized, no magnetic attractive force is generated between the fixed core 54 and the movable core 55. Therefore, the movable core 55 is moved toward the valve body 30 by the pressing force of the spring 16. Thereby, the needle 40 integrated with the movable core 55 is also moved to the valve body 30 side, and the seal portion 41 is seated on the valve seat 32. As a result, the fuel passage 42 and the injection hole 35 are blocked, and fuel is not injected from the injection hole 35.

  When the coil unit 51 is energized, a magnetic circuit in which magnetic flux flows through the plate housing 52, the second magnetic unit 14, the fixed core 54, the movable core 55, the first magnetic unit 12, and the holder 53 is generated by the magnetic field generated in the coil unit 51. It is formed. Therefore, a magnetic attractive force is generated between the fixed core 54 and the movable core 55. When the generated magnetic attraction force becomes larger than the pressing force of the spring 16, the movable core 55 integrated with the needle 40 is attracted toward the fixed core 54 side. Thereby, the seal portion 41 of the needle 40 is separated from the valve seat 32 of the valve body 30. The movable core 55 moves toward the fixed core 54 until it collides with the end of the fixed core 54 on the movable core 55 side. When the seal portion 41 is separated from the valve seat 32, the fuel in the fuel passage 42 flows between the seal portion 41 and the valve seat 32 into the injection hole 35 formed by the injection hole plate 34. As a result, fuel is injected from the injection hole 35.

  When energization of the coil unit 51 is stopped, the magnetic attractive force between the fixed core 54 and the movable core 55 disappears. Therefore, the movable core 55 and the needle 40 move to the valve body 30 side by the pressing force of the spring 16. The needle 40 moves until the seal portion 41 is seated on the valve seat 32 of the valve body 30. When the seal portion 41 of the needle 40 is seated on the valve seat 32 of the valve body 30, the fuel injection from the injection hole 35 is stopped.

As described above, in the first embodiment, the vibration caused by the collision between the fixed core 54 and the movable core 55 and the vibration caused by the collision between the needle 40 and the valve body 30 are transferred from the second magnetic portion 14 of the housing pipe 11 to the cylinder. It attenuate | damps by propagating to the thick part which the member 23 forms. The cylindrical member 23 is installed at the end of the accommodation pipe 11 close to the fuel inlet 15. Therefore, propagation of vibration and noise accompanying the operation of the injector 10 from the accommodation pipe 11 to the fuel rail 100 is reduced. Therefore, the operation sound and vibration of the injector 10 released to the outside can be reduced.
In the first embodiment, the cylindrical member 23 is fixed to the accommodation pipe 11 while supporting the support portion 22 of the fuel filter 20. Therefore, it is possible to reduce the operating sound and vibration emitted to the outside with a simple structure.

(Second Embodiment)
An injector according to a second embodiment of the present invention is shown in FIG.
In the second embodiment, as shown in FIG. 4, the configuration of the fuel filter 60 is different from that of the first embodiment. In the second embodiment, the fuel filter 60 has a mesh portion 61 and a support portion 62. The support portion 62 is integrally formed with a thick portion 63 at the end on the fuel inlet 15 side. That is, in the second embodiment, the support portion 62 of the fuel filter 60 is formed integrally with the cylindrical member that becomes the thick portion 63. Thus, the thick portion 63 is formed on the inner peripheral side of the housing pipe 11 by press-fitting the fuel filter 60 into the housing pipe 11.
In the second embodiment, since the thick portion 63 can be integrally formed with the fuel filter 60, the number of parts can be reduced.

(Third embodiment)
An injector according to a third embodiment of the present invention is shown in FIG.
In the third embodiment, the cylinder member 23 is provided closer to the fuel inlet 15 than the fuel filter 20 as shown in FIG. That is, in the third embodiment, the cylindrical member 23 separate from the fuel filter 20 is press-fitted to the fuel inlet 15 side with respect to the fuel filter 20. As a result, the cylindrical member 23 forms a thick portion at the end of the accommodation pipe 11 on the fuel inlet 15 side.
In the third embodiment, the fuel filter 20 can be used without changing the design.

(4th, 5th, 6th embodiment)
Injectors according to the fourth, fifth, and sixth embodiments of the present invention are shown in FIG. 6, FIG. 7, and FIG. 8, respectively.
In the fourth embodiment, the fuel filter 70 has a filter member 71 and a support portion 72 as shown in FIG. The filter member 71 is installed in the fuel passage 74 formed by the cylindrical member 73. The filter member 71 is supported by the support portion 72. The filter member 71 supported by the support part 72 is locked to the cylindrical member 73 and fixed to the accommodation pipe 11.

In the fifth embodiment, as shown in FIG. 7, the filter member 71 of the fuel filter 70 is installed in the fuel passage 74 formed by the cylindrical member 73. The filter member 71 is supported by the cylindrical member 73. The filter member 71 supported by the cylindrical member 73 is fixed to the accommodation pipe 11 together with the cylindrical member 73.
In the sixth embodiment, as shown in FIG. 8, the fuel filter 70 is provided closer to the fixed core 54 than the cylindrical member 73. That is, in the sixth embodiment, the support member 72 that supports the filter member 71 and the separate cylindrical member 73 are press-fitted closer to the fuel inlet 15 than the filter member 71 and the support member 72. Thereby, the cylindrical member 73 forms a thick part at the end of the accommodation pipe 11 on the fuel inlet 15 side.

(Seventh embodiment)
An injector according to a seventh embodiment of the present invention is shown in FIG.
In the seventh embodiment, the accommodation pipe 80 is formed thinner than the first to sixth embodiments described above, and the whole is integrally formed of a magnetic material or a nonmagnetic material. By forming the accommodating pipe 80 with a thin wall, even if the entire accommodating pipe 80 is integrally formed of a magnetic material, the magnetic flux that is short-circuited via the accommodating pipe 80 is easily saturated. For this reason, leakage of magnetic flux during energization of the coil portion 51 is reduced, and a sufficient magnetic flux flowing between the fixed core 54 and the movable core 55 is ensured. As a result, even if the entire housing pipe 11 is integrally formed of a magnetic material, it is possible to suppress a decrease in magnetic attractive force between the fixed core 54 and the movable core 55.

On the other hand, even if the entire housing pipe 80 is formed of a nonmagnetic material, the magnetic flux easily passes between the plate housing 52 and the fixed core 54 via the thin housing pipe 80. Therefore, even if the entire accommodation pipe 80 is integrally formed of a nonmagnetic material, it is possible to suppress a decrease in magnetic attractive force between the fixed core 54 and the movable core 55.
In the seventh embodiment, the accommodation pipe 80 is formed of a single member by forming the accommodation pipe 80 with a thin magnetic material or a non-magnetic material. Therefore, the number of parts can be reduced. In the seventh embodiment, the accommodation pipe 80 is thinned. Therefore, the difference in thickness between the accommodation pipe 80 and the cylindrical member 23 increases. As a result, the vibration attenuation rate between the accommodation pipe 80 and the cylindrical member 23 can be increased. Therefore, vibration propagating from the accommodation pipe 80 to the fuel rail 100 can be further damped, and vibration and noise released to the outside can be reduced.

(Other embodiments)
In each of the embodiments of the present invention described above, the thick wall portion 63 of the tubular member 23 and the fuel filter 60 is installed on the inner peripheral side of the housing pipe 11, thereby thickening the end of the housing pipe 11 on the fuel inlet 15 side. Forming part. However, you may install a thick part in the accommodation pipe 11 itself by projecting the accommodation pipe 11 inward or outward in the radial direction. Further, in each embodiment of the present invention, the example in which the mesh portions 21 and 61 or the filter member 71 are installed on the downstream side or in the middle of the cylindrical members 23 and 73 or the thick portion 63 in the fuel flow direction has been described. However, the mesh portions 21 and 61 or the filter member 71 may be installed upstream of the tubular members 23 and 73 or the thick portion 63 in the fuel flow direction. Furthermore, in each embodiment of the present invention, the example in which the injection hole 35 is formed in the injection hole plate 34 installed in the valve body 30 has been described. However, the nozzle hole 35 may be provided directly in the valve body 30.

  As described above, the present invention is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof.

Sectional drawing which shows the outline of the injector by 1st Embodiment of this invention. Sectional drawing which expanded the vicinity of the valve body of the injector by 1st Embodiment of this invention. Sectional drawing which expanded the edge part vicinity of the fuel inlet side of the injector by 1st Embodiment of this invention. Sectional drawing which expanded the edge part vicinity by the side of the fuel inlet of the injector by 2nd Embodiment of this invention. Sectional drawing which expanded the edge part near the fuel inlet side of the injector by 3rd Embodiment of this invention. Sectional drawing which expanded the edge part near the fuel inlet side of the injector by 4th Embodiment of this invention. Sectional drawing which expanded the edge part near the fuel inlet side of the injector by 5th Embodiment of this invention. Sectional drawing which expanded the edge part vicinity of the fuel inlet side of the injector by 6th Embodiment of this invention. Sectional drawing which shows the outline of the injector by 7th Embodiment of this invention.

Explanation of symbols

  10: injector (fuel injection valve), 11, 80: receiving pipe (housing), 16: spring, 17: adjusting pipe, 21, 61: mesh part (filter member), 23, 73: cylindrical member (thick part) ), 30: valve body (housing), 32: valve seat, 33: opening, 40: needle (valve member), 42: fuel passage, 54: fixed core, 55: movable core, 63: thick part, 71 : Filter member

Claims (5)

A housing having an opening and forming a fuel passage communicating with the opening in the interior;
A valve member provided inside the housing, wherein the flow of the fuel to the opening is interrupted by being seated on or away from the valve seat of the housing;
A thick wall portion provided at an end opposite to the opening in the axial direction of the housing, and having a larger wall thickness than other portions of the housing;
A fuel injection valve comprising:   The fuel injection valve according to claim 1, wherein the thick part is formed by a cylindrical member provided at an end of the housing opposite to the opening. A filter member for removing foreign matter contained in the fuel flowing into the fuel passage;
The fuel injection valve according to claim 2, wherein the cylindrical member supports the filter member.   4. The fuel injection valve according to claim 2, wherein the cylindrical member is made of a material having a vibration damping rate larger than that of the housing. A movable core provided inside the housing and reciprocating in the axial direction together with the valve member;
A fixed core provided facing the movable core;
An elastic member provided on the inner peripheral side of the fixed core, one end of which is in contact with the movable core, and presses the movable core toward the valve seat;
A cylindrical adjusting pipe that is press-fitted into the fixed core, is in contact with the other end of the elastic member, and adjusts the load of the elastic member;
The fuel injection valve according to any one of claims 1 to 4, wherein an inner diameter of the thick portion is larger than an inner diameter of the adjusting pipe.

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