Fuel injection valve and orifice member

Abstract

Provided is a fuel injection valve (1) which requires no press-fit section to be provided in a fuel passage (9) and in which an orifice member (27) can be installed. This fuel injection valve (1) is provided with: a fuel passage (9) within an upper housing (10); a fuel inlet tube section (25) that is constituted by an upstream-side end section of the upper housing (10) and that forms an upstream-side opening section (24) of the fuel passage (9); and an orifice member (27) in which is provided an orifice (26) that constricts the channel cross-sectional area of the fuel passage (9). The orifice member (27) is provided with: an orifice section (29) that covers the upstream-side opening section (24) and constitutes the orifice (26); and a fixed section (30) that extends downstream from a peripheral section of the orifice section (29), the inner side of the fixed section (30) being fixed to the outer periphery of the fuel inlet tube section (25).

Description

[Technical Field]

[0001] The present invention relates to a fuel injection valve provided with an orifice member that narrows the cross-sectional area of ​​a fuel passage, and to the orifice member. [Background technology]

[0002] BACKGROUND ART Conventionally, a fuel injection valve has been known that has an orifice member formed with an orifice that narrows the flow path cross-sectional area of ​​a fuel passage provided in a housing at an upstream opening of the fuel passage (see, for example, Patent Document 1).

[0003] In the fuel injection valve of Patent Document 1, a tubular member having a thick wall portion is press-fitted and fixed inside the upstream opening of a containing pipe that forms a fuel passage. The thick wall portion of the tubular member functions as an orifice member that throttles the upstream opening, and also has the function of rapidly increasing the wall thickness of the containing pipe at the upstream opening.

[0004] This sudden increase in thickness due to the thickened portion damps the vibration of the fuel injector that is transmitted from the accommodating pipe to the fuel rail, thereby reducing the vibration and noise emitted from the fuel rail to the outside. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-285283 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, in the fuel injection valve of Patent Document 1, a cylindrical member that functions as an orifice member is press-fitted and fixed inside the upstream opening of the containing pipe that forms the fuel passage. However, to install a new orifice member using this method, it is necessary to provide a press-fit portion for press-fitting the orifice member inside the upstream opening of the fuel passage. This requires design changes to the interior of the containing pipe and the filter for the fuel supply port.

[0007] SUMMARY OF THE INVENTION In view of the above problems in the prior art, an object of the present invention is to provide a fuel injection valve in which an orifice member can be installed without the need to provide a press-fit portion in the fuel passage. [Means for solving the problem]

[0008] The fuel injection valve of the present invention comprises: Housing and a fuel passage formed within the housing; a cylindrical fuel inlet portion formed by an upstream end portion of the housing and defining an upstream opening of the fuel passage; The fuel passage of incoming fuel an orifice member provided with an orifice that narrows the cross-sectional area of ​​the flow path; The orifice member is Covering the upstream opening, The orifice-opened disk-shaped an orifice portion; The orifice portion extends downstream from the periphery thereof, and the inner side of the orifice portion is fixed to the outer periphery of the cylindrical fuel inlet portion. cylindrical a fixing portion; All of the fuel to be injected is supplied through one fuel inlet pipe portion, A fuel supply cap provided on a fuel distribution pipe is fitted onto the outside of the orifice member, The orifice suppresses pulsation of fuel pumped from the fuel pump to the cylindrical fuel inlet portion through the cylindrical space between the bottom surface of the fuel supply cap and the orifice portion and the orifice. It is characterized by:

[0009] In the present invention, the orifice member is installed in the fuel passage by fixing the inside of a fixing portion extending downstream from the periphery of the orifice portion to the outer periphery of the cylindrical fuel inlet portion. Therefore, according to the present invention, the orifice member can be installed in the fuel passage without providing a press-fit portion on the inside. In other words, the orifice member can be installed without requiring design changes to the inside of the cylindrical fuel inlet portion of the housing or to the filter installed there.

[0010] In the present invention, a flange portion that protrudes radially outward or an annular recess that is recessed radially inward may be provided on the outer periphery of the upstream end of the fuel inlet cylindrical portion, and the fixing portion may include an annular protrusion that protrudes radially inward and is fixed to the flange portion or the annular recess.

[0011] According to this, the orifice member is made of an elastically deformable material, and the annular convex portion of the orifice member is pressed against the cylindrical fuel inlet portion of the housing so that it overcomes the flange portion of the cylindrical fuel inlet portion or is recessed into the annular concave portion, thereby allowing the orifice member to be fixed to the outer periphery of the cylindrical fuel inlet portion using a snap-fit ​​method.

[0012] The orifice member of the present invention includes a fuel passage formed in a housing, and a cylindrical fuel inlet portion formed at an upstream end of the housing and forming an upstream opening of the fuel passage, The fuel injected through the fuel inlet of a fuel injection valve in which all fuel to be injected is supplied through one fuel inlet An orifice member that narrows the cross-sectional area of ​​a flow path, Covering the upstream opening, an orifice A disk-shaped hole an orifice portion; Extending downstream from the periphery of the orifice cylindrical a fixing portion; the fixing portion includes an annular protrusion that protrudes radially inward and is fixed to an outer periphery of the cylindrical fuel inlet portion, A fuel supply cap provided on a fuel distribution pipe is fitted onto the outside of the orifice member, The orifice suppresses pulsation of fuel pumped from the fuel pump to the cylindrical fuel inlet portion through the cylindrical space between the bottom surface of the fuel supply cap and the orifice portion and the orifice. It is characterized by:

[0013] According to the present invention, the orifice member includes a fixing portion having an annular protrusion that is fixed to the outer periphery of the cylindrical fuel inlet portion of the housing of the fuel injection valve, so that the fixing portion can be selected and designed to fit the outer periphery of the cylindrical fuel inlet portion. Specifically, the annular protrusion of the fixing portion can be configured to be fixed to an annular recess or flange portion provided on the outer periphery of the cylindrical fuel inlet portion. This makes it possible to install the orifice member at the upstream opening of the fuel passage without having to provide a press-fit portion inside the fuel passage.

[0014] In the present invention, the fixing portion may be provided with at least one notch formed along the extending direction thereof and open on the downstream side. According to this, when the orifice member is attached by a snap-fit ​​method, by appropriately designing the notch, the amount of deflection of the fixing portion can be optimized and workability during attachment can be improved.

[0015] In the present invention, the orifice portion may include an orifice forming member that forms the orifice and a surrounding member that surrounds the orifice. In this case, the material of the orifice forming member can be selected in consideration of durability, and the material of the surrounding member, if made of the same material as the fixed portion, can be selected in consideration of ease of attachment of the orifice member.

[0016] In the present invention, the orifice portion may include a plurality of orifices. In this case, by providing a plurality of orifices in the orifice portion and setting the flow path cross-sectional area of ​​the fuel passage to be wide accordingly, it is possible to adjust the effect of the orifices in suppressing fuel pulsation. This makes it possible to obtain a more accurate pulsation suppression effect. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a simplified cross-sectional view of a fuel injection valve according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged cross-sectional view of a main part of the fuel injection valve of FIG. 1. [Figure 3]2 is a cross-sectional view of the vicinity of a cylindrical fuel inlet portion to which an orifice member is fixed in the fuel injection valve of FIG. 1. FIG. [Figure 4] 2 is a cross-sectional view showing a state in which an orifice member is attached to a cylindrical fuel inlet portion of the fuel injection valve of FIG. 1. FIG. [Figure 5] FIG. 6 is a cross-sectional view of the vicinity of a cylindrical fuel inlet portion of a fuel injection valve according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a cross-sectional view of the vicinity of a cylindrical fuel inlet portion of a fuel injection valve according to a third embodiment of the present invention. [Figure 7] FIG. 10 is a plan view of an orifice member fixed to a cylindrical fuel inlet portion of a fuel injection valve according to a fourth embodiment of the present invention, as viewed from the upstream side. [Figure 8] FIG. 10 is a cross-sectional view of an orifice member of a fuel injection valve according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 shows a fuel injection valve according to a first embodiment of the present invention. As shown in Fig. 1, this fuel injection valve 1 includes a valve housing 3 having a valve seat 2 at its tip, a hollow fixed core 4 connected to the upstream side of the valve housing 3, a coil 5 disposed on the outer periphery of the fixed core 4, a valve element 8 formed by connecting a rod 7 to a valve portion 6 that cooperates with the valve seat 2, and an upper housing 10 having a fuel passage 9 formed therein.

[0019] The valve housing 3 includes a hollow cylindrical housing body 11 and a valve seat member 12 that is fitted onto and welded to the inner periphery of one end of the housing body 11. The valve seat 2 is formed at the tip of the valve seat member 12. The upper housing 10 includes a fixed core 4 that is integral with and coaxial with the fixed core 4 at its downstream end. The fuel passage 9 in the upper housing 10 communicates with a hollow portion 13 within the fixed core 4.

[0020] 2 is an enlarged view of a main portion 14 involved in driving the valve element 8 of the fuel injection valve 1 when the valve element 8 is in a closed state. As shown in Fig. 2, the fuel injection valve 1 includes a movable core 16 that faces an attraction surface 15 of the fixed core 4 and is slidably fitted on the rod 7, a valve-opening stopper 17 that is fixed to the rod 7 and that comes into contact with the movable core 16 that is attracted to the attraction surface 15 when the coil 5 is energized, thereby opening the valve element 8, a valve-closing stopper 18 that is fixed to the rod 7 on the valve seat 2 side of the valve-opening stopper 17, a valve spring 19 that urges the valve element 8 in the valve-closing direction, and an auxiliary spring 20 that exerts a spring force that moves the movable core 16 away from the valve-opening stopper 17 and into contact with the valve-closing stopper 18 when the coil 5 is not energized.

[0021] The valve housing 3 further includes a magnetic cylinder 21, one end of which is fitted onto the outer periphery of the upstream end of the housing body 11 and welded to the housing body 11, and a non-magnetic cylinder 22, one end of which is coaxially coupled to the other end of the magnetic cylinder 21. The other end of the non-magnetic cylinder 22 is coaxially coupled to the front end of the fixed core 4, which has a hollow portion 13. As shown in FIG. 1, the magnetic cylinder 21 has a flange-shaped yoke portion 23 integrally formed at its axially intermediate portion.

[0022] Fig. 3 shows the vicinity of the upstream end of the upper housing 10. As shown in Fig. 3, the fuel injection valve 1 is configured by the upstream end of the upper housing 10 and includes a cylindrical fuel inlet portion 25 that forms an upstream opening 24 of the fuel passage 9, and an orifice member 27 that is provided with an orifice 26 that narrows the flow path cross-sectional area of ​​the fuel passage 9. A filter 28 is attached inside the cylindrical fuel inlet portion 25.

[0023] The orifice member 27 includes an orifice portion 29 that covers the upstream opening 24 and constitutes the orifice 26, and a cylindrical fixing portion 30 that extends downstream from the periphery of the orifice portion 29 and has its inner surface fixed to the outer periphery of the tubular fuel inlet portion 25. A flange portion 31 that protrudes radially outward is provided at the upstream end of the tubular fuel inlet portion 25.

[0024] The fixing portion 30 has an annular protrusion 32 that protrudes radially inward and contacts the downstream side of the flange portion 31 to be fixed to the flange portion 31. The inner diameter of the annular protrusion 32 is slightly smaller than the outer diameter of the flange portion 31. The outer diameter of the flange portion 31 is equal to the inner diameter of the fixing portion 30 on the upstream side of the annular protrusion 32.

[0025] Fig. 4 shows how this fixing is performed. As shown in Fig. 4, when fixing the inside of the orifice member 27 to the outer periphery of the cylindrical fuel inlet portion 25, the fixing portion 30 side of the orifice member 27 is pressed coaxially against the flange portion 31 of the cylindrical fuel inlet portion 25, causing the annular protrusion 32 to slightly widen and climb over the flange portion 31.

[0026] As a result, the annular protrusion 32 is positioned downstream of the flange portion 31 and the outer periphery of the flange portion 31 contacts the inner surface of the fixing portion 30, thereby fixing the orifice member 27 to the cylindrical fuel inlet portion 25. The orifice member 27 is made of a material that can be elastically deformed to such an extent that such fixing can be achieved.

[0027] As shown in FIG. 1, a fuel supply cap 34 provided on a fuel distribution pipe 33 is fitted via an annular seal member 35 onto the fuel inlet cylindrical portion 25 to which the orifice member 27 is fixed.

[0028] In this configuration, when the coil 5 is de-energized, the valve element 8 is pressed by the set load of the valve spring 19 to seat on the valve seat 2 and close the fuel nozzle hole 36 near the center of the valve seat 2. In other words, the fuel injection valve 1 is in a valve-closed state, and as shown in FIG. 2, the movable core 16 is held in contact with the valve-closing stopper 18 by the set load of the auxiliary spring 20, and a predetermined gap is maintained between the movable core 16 and the fixed core 4.

[0029] In this valve-closed state, when current is applied to coil 5 via coupler 37, the resulting magnetic force first attracts movable core 16 to fixed core 4, causing it to come into contact with valve-opening stopper 17 while compressing auxiliary spring 20, which has a smaller set load than valve spring 19. Furthermore, attracted to fixed core 4, movable core 16 moves valve-opening stopper 17 against the set load of valve spring 19, until it collides with attraction surface 15 and stops. This movement of valve-opening stopper 17 causes valve portion 6 at the tip of rod 7, which is fixed to valve-opening stopper 17, to leave valve seat 2, thereby establishing an open valve state.

[0030] When movable core 16 impacts against suction surface 15, valve element 8, which is made up of valve part 6 and rod 7, overshoots due to its inertia, but the overshoot is stopped when valve-closing stopper 18, which is integrated with valve element 8, collides with movable core 16. Meanwhile, valve-opening stopper 17 moves away from movable core 16 by an amount equal to the overshoot of valve element 8, increasing the compressive deformation of valve spring 19, and the repulsive force of valve spring 19 also suppresses the overshoot of valve element 8.

[0031] When the overshoot stops, the repulsive force of valve spring 19 returns valve-opening stopper 17 to a position where it abuts against movable core 16, which is in contact with attraction surface 15, thereby holding valve element 8 in the predetermined valve-open position. At this time, the set load of auxiliary spring 20 is set to be smaller than the set load of valve spring 19 that urges valve element 8 in the valve-closing direction, so when coil 5 is energized, auxiliary spring 20 does not interfere with the attraction of fixed core 4 to movable core 16 or the abutment of valve-opening stopper 17 against movable core 16 by valve spring 19, and does not hinder valve element 8 from opening to the predetermined position.

[0032] In this way, during the process of opening the valve body 8, the impact force that the movable core 16 imparts to the attraction surface 15 is divided into the impact force when only the movable core 16 first collides with the attraction surface 15, and the impact force when the closing side stopper 18 subsequently collides with the movable core 16. Therefore, the energy of each collision is relatively small, which prevents wear at the contact points between the attraction surface 15 and the movable core 16 and keeps the collision noise low.

[0033] Furthermore, when the closing side stopper 18 collides with the movable core 16, the valve spring 19 is deformed by a larger amount than the amount of compressive deformation that occurs when the valve is normally open, so that the valve spring 19 absorbs the collision energy of the closing side stopper 18 with the movable core 16 and reduces the impact force.

[0034] When the valve element 8 opens, fuel is pressure-fed from a fuel pump (not shown) through the orifice 26 and the filter 28 into the fuel passage 9. The fuel passes through the hollow portion 13 of the fixed core 4, the flat portion 38 around the valve-opening stopper 17, the through hole 39 of the movable core 16, the inside of the valve housing 3, and the flat portion around the valve portion 6, and is then injected directly into the combustion chamber of the internal combustion engine through the fuel nozzle 36.

[0035] Next, when the power supply to the coil 5 is cut off, the repulsive force of the valve spring 19 presses the valve-opening stopper 17, which moves toward the valve seat 2 together with the movable core 16 and valve element 8, causing the valve portion 6 to seat on the valve seat 2. At this time, the movable core 16 moves slightly later than the valve portion 6 seats on the valve seat 2, due to the influence of residual magnetism between it and the fixed core 4 and the relatively small set load of the auxiliary spring 20 that urges the movable core 16 forward.

[0036] When the valve element 8 first seats on the valve seat 2, it bounces back due to the impact of the seating, but the amount of rebound of the valve element 8 is minimized by the moving movable core 16 coming into contact with the valve-closing stopper 18 fixed to the bouncing valve element 8. When the bouncing of the valve element 8 is suppressed, the valve element 8 is held in the closed state by the repulsive force of the valve spring 19, stopping fuel injection, and the movable core 16 is held in contact with the valve-closing stopper 18 by the repulsive force of the auxiliary spring 20.

[0037] As described above, the impact force that the valve element 8 exerts on the valve seat 2 during the valve closing process can be divided into the impact force when only the valve element 8 first seats on the valve seat 2 and the impact force when the movable core 16 subsequently collides with the closing-side stopper 18, and therefore the collision energy of each is relatively small.

[0038] Furthermore, when the valve disc 8 first seats on the valve seat 2, it bounces back due to the impact of the seating, and then seats again on the valve seat 2, causing an impact, but the valve closing stroke of the valve disc 8 after bouncing back is much smaller than the valve closing stroke of the valve disc 8 from the normal valve open position, so the impact force on the valve seat 2 is very small. This prevents wear on the seating areas of the valve part 6 and the valve seat 2 and suppresses seating noise.

[0039] Furthermore, while fuel injection is repeated by such valve opening and closing operations, the pulsation of the fuel sent from the fuel pump to the fuel injection valve 1 is suppressed by the orifice 26 of the orifice member 27. This allows precise control of the fuel injection timing to the fuel injection valve 1 to be performed without any hindrance.

[0040] According to the first embodiment, the orifice member 27 is installed in the fuel passage 9 by fixing the inside of the fixing portion 30 to the outer periphery of the cylindrical fuel inlet portion 25, and therefore can be installed without providing a press-fit portion on the inside of the cylindrical fuel inlet portion 25. Therefore, in order to install the orifice member 27, it is not necessary to change the design of the inside of the cylindrical fuel inlet portion 25 or the filter 28 provided therein.

[0041] Fig. 5 shows the vicinity of the cylindrical fuel inlet portion in a fuel injection valve according to a second embodiment of the present invention. The orifice member 27 in Fig. 3 is used as the orifice member. An annular recess 40 recessed radially inward is provided on the outer periphery of this cylindrical fuel inlet portion 25b. The annular recess 40 has a rectangular cross-sectional shape. The outer periphery on the upstream side of the annular recess 40 in the cylindrical fuel inlet portion 25b is slightly smaller in diameter than the downstream side, and the end face side of the cylindrical fuel inlet portion 25b forms a tapered surface 41 whose diameter decreases toward the end face.

[0042] The downstream outer diameter of the upstream outer periphery of the annular recess 40 is slightly larger than the inner diameter of the annular protrusion 32 of the orifice member 27. The diameter of the tapered surface 41 at the end face of the cylindrical fuel inlet portion 25b is equal to or slightly smaller than the inner diameter of the annular protrusion 32 of the orifice member 27. In this case, too, the orifice member 27 is fixed to the outer periphery of the cylindrical fuel inlet portion 25b in the same manner as in FIG. 4. Other points are the same as in the first embodiment.

[0043] According to the second embodiment, by pressing the orifice member 27 downstream along the tapered surface 41 against the cylindrical fuel inlet portion 25b, the annular convex portion 32 of the orifice member 27 is positioned in the annular concave portion 40, and the orifice member 27 can be easily attached and fixed to the cylindrical fuel inlet portion 25b.

[0044] Fig. 6 shows a cylindrical fuel inlet portion of a fuel injection valve according to a third embodiment of the present invention. The orifice member is the orifice member 27 shown in Fig. 3. An annular recess 40b recessed radially inward is provided on the outer periphery of the upstream end of this cylindrical fuel inlet portion 25c. The annular recess 40b has a curved cross section. The outer periphery on the upstream side of the annular recess 40b in the cylindrical fuel inlet portion 25c has a slightly larger diameter than the downstream side, and the end face of the cylindrical fuel inlet portion 25c on the upstream side of the outer periphery forms a tapered surface 41b whose diameter decreases toward the end face.

[0045] The downstream outer diameter of the upstream outer periphery of the annular recess 40b of the cylindrical fuel inlet portion 25c is slightly larger than the inner diameter of the annular protrusion 32 of the orifice member 27. The diameter of the tapered surface 41b at the end face of the cylindrical fuel inlet portion 25c is equal to or slightly smaller than the inner diameter of the annular protrusion 32 of the orifice member 27. In this case, too, the orifice member 27 is fixed to the outer periphery of the cylindrical fuel inlet portion 25c in the same manner as in FIG. 4. Other points are the same as in the first embodiment.

[0046] According to the third embodiment, by pressing the orifice member 27 downstream along the tapered surface 41b against the cylindrical fuel inlet portion 25c, the annular convex portion 32 of the orifice member 27 is positioned in the annular concave portion 40b, and the orifice member 27 can be easily attached and fixed to the cylindrical fuel inlet portion 25c.

[0047] 7 shows an orifice member of a fuel injection valve according to a fourth embodiment of the present invention, viewed from the upstream side. This orifice member 27b has a fixing portion 30b extending downstream from the periphery of its orifice portion 29b, and is provided with at least one notch 42 formed along the extending direction of the fixing portion 30b, the notch 42 being open on the downstream side. The orifice member 27b can be applied to any of the fuel inlet cylindrical portions 25, 25b, and 25c shown in FIGS. 4 to 6. The orifice member 27b is fixed in the same manner as in FIG. 4. Other points are the same as in the first embodiment.

[0048] According to the fourth embodiment, the orifice member 27b can be easily attached to the cylindrical fuel inlet portion 25, 25b, or 25c by a snap fit method. In this case, by appropriately designing the notch 42, the amount of deflection of the fixing portion 30b can be optimized, improving the ease of attachment.

[0049] 8 shows an orifice member of a fuel injection valve according to a fifth embodiment of the present invention. This orifice member 27c has an orifice portion 29c that includes an orifice forming member 43 that forms the orifice 26b, and a surrounding member 44 that surrounds it. The orifice member 27c can be formed by insert molding or press-fitting.

[0050] When forming by insert molding, the orifice forming member 43 made of metal can be formed integrally with the resin surrounding member 44 and the fixed part 30 by injection molding using the metal orifice forming member 43 as an insert part. When forming by press fitting, the orifice forming member 43 made of spring material can be formed by press fitting and fixing the orifice forming member 43 into the metal surrounding member 44 and the fixed part 30.

[0051] According to the fifth embodiment, the material of the orifice forming member 43 can be selected in consideration of durability, and the materials of the surrounding member 44 and the fixed portion 30 can be selected in consideration of ease of attachment. Other points are the same as in the first embodiment.

[0052] Although the embodiments of the present invention have been described above, the present invention is not limited to these. For example, the fuel injection device or orifice member of the present invention is not limited to a direct injection injector (DI-INJ), but can also be applied to a port injector (PI-INJ) or a gas injector.

[0053] The orifice portion may have a plurality of orifices. In this case, by widening the cross-sectional area of ​​the fuel passage in accordance with the number of orifices, the effect of the orifices in suppressing fuel pulsation can be adjusted, thereby suppressing fuel pulsation with higher accuracy. [Explanation of symbols]

[0054] 1... fuel injection valve, 2... valve seat, 3... valve housing, 4... fixed core, 5... coil, 6... valve portion, 7... rod, 8... valve disc, 9... fuel passage, 10... upper housing, 11... housing body, 12... valve seat member, 13... hollow portion, 14... main portion, 15... suction surface, 16... movable core, 17... valve opening stopper, 18... valve closing stopper, 19... valve spring, 20... auxiliary spring, 21... magnetic cylindrical body, 22... non-magnetic cylindrical body, 23... yoke portion, 24... upstream opening, 25, 25b, 25c... Fuel inlet tube portion, 26, 26b... orifice, 27, 27b, 27c... orifice member, 28... filter, 29, 29b, 29c... orifice portion, 30, 30b... fixing portion, 31... flange portion, 32... annular convex portion, 33... fuel distribution pipe, 34... fuel supply cap, 35... sealing member, 36... fuel nozzle hole, 37... coupler, 38... flat portion, 39... through hole, 40, 40b... annular recess, 41, 41b... tapered surface, 42... notch portion, 43... orifice forming member, 44... surrounding member.

Claims

1. Housing and a fuel passage formed within the housing; a cylindrical fuel inlet portion formed by an upstream end portion of the housing and defining an upstream opening of the fuel passage; an orifice member provided with an orifice that narrows the cross-sectional area of ​​the flow path of the fuel flowing into the fuel passage, The orifice member is a disk-shaped orifice portion that covers the upstream opening and has the orifice; a cylindrical fixing portion extending downstream from a periphery of the orifice portion, the inner side of which is fixed to an outer periphery of the cylindrical fuel inlet portion, All of the fuel to be injected is supplied through one of the fuel inlet pipe portions, A fuel supply cap provided on a fuel distribution pipe is fitted onto the outside of the orifice member, a fuel injection valve configured to suppress pulsation of fuel pressure-fed from a fuel pump through a cylindrical space between a bottom surface of the fuel supply cap and the orifice portion and through the orifice to the cylindrical fuel inlet portion.

2. a flange portion that protrudes radially outward or an annular recessed portion that recesses radially inward on an outer periphery of an upstream end of the fuel inlet cylindrical portion, 2. The fuel injection valve according to claim 1, wherein the fixing portion includes an annular protrusion that protrudes radially inward and is fixed to the flange portion or the annular recess portion.

3. an orifice member for restricting a flow path cross-sectional area of ​​fuel pressure-fed to the cylindrical fuel inlet portion of a fuel injection valve, the orifice member comprising: a fuel passage formed in a housing; and a cylindrical fuel inlet portion formed by an upstream end portion of the housing and forming an upstream opening of the fuel passage, the cylindrical fuel inlet portion being configured to include an orifice member for restricting a flow path cross-sectional area of ​​fuel pressure-fed to the cylindrical fuel inlet portion of a fuel injection valve, in which all fuel to be injected is supplied through the single cylindrical fuel inlet portion, a disk-shaped orifice portion that covers the upstream opening and has an orifice; a cylindrical fixing portion extending downstream from a periphery of the orifice portion, the fixing portion includes an annular protrusion that protrudes radially inward and is fixed to an outer periphery of the cylindrical fuel inlet portion, A fuel supply cap provided on a fuel distribution pipe is fitted onto the outside of the orifice member, an orifice member characterized in that the orifice suppresses pulsation of fuel pressure-fed from a fuel pump to the cylindrical fuel inlet portion through a cylindrical space between a bottom surface of the fuel supply cap and the orifice portion and the orifice.

4. 4. The orifice member according to claim 3, wherein the fixed portion is provided with at least one notch formed along the extending direction of the fixed portion and formed so as to be open on the downstream side.

5. 4. The orifice member according to claim 3, wherein the orifice portion comprises an orifice forming member that forms the orifice and a surrounding member that surrounds the orifice forming member.

6. The orifice member according to claim 3 , wherein the orifice portion includes a plurality of the orifices.

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