WO2011013435A1 - 電磁式燃料噴射弁 - Google Patents
電磁式燃料噴射弁 Download PDFInfo
- Publication number
- WO2011013435A1 WO2011013435A1 PCT/JP2010/058607 JP2010058607W WO2011013435A1 WO 2011013435 A1 WO2011013435 A1 WO 2011013435A1 JP 2010058607 W JP2010058607 W JP 2010058607W WO 2011013435 A1 WO2011013435 A1 WO 2011013435A1
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- WIPO (PCT)
- Prior art keywords
- valve
- hole
- diameter
- fuel injection
- valve body
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
- F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
- F02M51/0646—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being a short body, e.g. sphere or cube
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
- F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
- F02M51/0646—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being a short body, e.g. sphere or cube
- F02M51/065—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being a short body, e.g. sphere or cube the valve being spherical or partly spherical
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0632—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a spherically or partly spherically shaped armature, e.g. acting as valve body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
- F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
- F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
- F02M51/0657—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve the body being hollow and its interior communicating with the fuel flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
- F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
- F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
- F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/188—Spherical or partly spherical shaped valve member ends
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S239/00—Fluid sprinkling, spraying, and diffusing
- Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve
Definitions
- 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, a valve seat member having a valve seat and a valve hole at a front end, a fixed core, and a fuel inlet cylinder are connected to the front and rear.
- a valve assembly that opens and closes the valve hole in cooperation with the valve seat, and separates and seats the valve assembly on the valve seat.
- the present invention relates to improvement of an electromagnetic fuel injection valve.
- a first vertical hole communicating with the fuel inlet cylinder is provided in the fixed core, a second vertical hole communicating with the first vertical hole, and the second vertical hole.
- the movable core is provided with a plurality of horizontal holes that open the holes toward the rear end surface of the valve seat member, when the valve body is opened, the high-pressure fuel that has passed through the horizontal holes from the second vertical hole is the valve seat member. Colliding with the rear end face causes a large pressure loss, which is one of the factors that hinder the atomization of injected fuel.
- the movable core needs to be lengthened in order to compensate for the capacity reduction due to the lateral hole, which prevents the electromagnetic fuel injection valve from being made compact.
- the present invention has been made in view of such circumstances. There is little pressure loss of fuel in the valve housing, and it is not necessary to lengthen the entire length of the movable core. Therefore, the atomization of the injected fuel is good and compact. It is an object of the present invention to provide a simple electromagnetic fuel injection valve.
- the present invention provides a valve housing having a valve seat and a valve hole at the front end, a fixed core, a fuel inlet cylinder connected to the front and rear, and having a fuel passage inside, and the valve housing.
- a coil disposed on the outer periphery of the housing and energized to excite the fixed core, and accommodated in the valve housing, and cooperates with the valve seat to demagnetize and excite the fixed core.
- a valve assembly that opens and closes, and separates and seats the valve assembly on the valve seat, the basic shape is spherical and has a plurality of flow passages on the outer periphery, and is slidable on the valve housing
- the electromagnetic fuel injection valve constituted by a movable core fitted to the valve body and a valve shaft integrally projecting with a smaller diameter at the front end of the movable core and connected to the valve body, the valve seat member , Valves connected to the valve seat to guide the valve body slidably
- a guide hole and a large-diameter hole larger in diameter than the valve element guide hole are provided at the rear end of the valve element guide hole via a taper hole, and the first vertical hole communicating with the fuel inlet cylinder is formed as described above.
- a second vertical hole is provided in the fixed core and communicates with the first vertical hole from the movable core to the valve shaft, and a horizontal hole that opens the second vertical hole to the large-diameter hole is provided on the valve shaft.
- the first feature is that the relationship between the diameter D1 of the large diameter hole and the valve body guide hole diameter D2 is D2 / D1 ⁇ 0.6.
- the present invention has a second feature that the taper angle of the tapered hole is set to 50 ° to 70 °.
- the present invention provides the valve shaft with a hollow shaft portion having the second vertical hole, a diameter smaller than the hollow shaft portion, and a solid, hollow shaft portion.
- a solid shaft portion connected to the front end, and the front end portion of the hollow shaft portion is inserted into the valve body guide hole so that a cylindrical flow is formed between the hollow shaft portion and the inner peripheral surface of the valve body guide hole.
- the third feature is that the road is defined.
- the high-pressure fuel that has been waiting in the second vertical hole of the valve assembly passes through the single lateral hole provided in the valve shaft, Because of the smooth flow to the large-diameter hole side with a relatively large volume, there is little pressure loss.
- the high-pressure fuel that has moved to the large-diameter hole is smoothly squeezed by the taper hole, guided to the valve body guide hole while increasing the flow velocity, passes through multiple flow passages on the outer periphery of the valve body, and then further squeezed by the valve seat.
- the fuel is injected at a high speed through the valve hole and in front of the valve seat member while further increasing the flow velocity, the injected fuel can be atomized well.
- the horizontal hole is provided in the valve shaft and only the second vertical hole passes through the movable core, it is possible to avoid a decrease in the capacity of the movable core due to the horizontal hole, and to make the movable core more compact and to be electromagnetic. This can contribute to downsizing of the fuel injection valve. Furthermore, if the valve shaft has a single horizontal hole, it should be possible to minimize the occurrence of burrs during electrical discharge machining and machining of the horizontal hole, simplifying the deburring operation, and contributing to cost reduction. Therefore, the strength of the valve shaft can be secured and its diameter can be reduced, and the effective volume of the large-diameter hole can be increased accordingly.
- the flow rate of the high-pressure fuel can be effectively increased from the large diameter hole to the valve body guide hole. Therefore, it is possible to reduce the diameter of the spherical valve body supported in the valve body guide hole, and it is possible to provide a small injection flow type small electromagnetic fuel injection valve particularly effective for a small motorcycle or the like.
- the taper angle of the tapered hole connecting between the large diameter hole and the valve element guide hole is set to 50 ° to 70 °, so that the flow of the high-pressure fuel is smoother in the tapered hole.
- the increase in the total length of the valve seat member can be suppressed as much as possible, which can contribute to the compactness of the electromagnetic fuel injection valve.
- the third feature of the present invention it is possible to achieve both reduction in thickness and weight of the valve shaft and securing of strength.
- the valve body When the valve body is opened, the flow of high-pressure fuel constricted by the taper hole is rectified by the cylindrical flow path and then divided into a plurality of flow path portions on the outer periphery of the valve body. Even if it is 1, it is possible to equalize the flow rates to the respective flow passages and to stabilize the direction of fuel injection from the fuel injection holes.
- FIG. 1 is a longitudinal sectional view of an electromagnetic fuel injection valve according to an embodiment of the present invention.
- FIG. 2 is an enlarged view of part 2 of FIG.
- First embodiment 3 is a cross-sectional view taken along line 3-3 of FIG. (First embodiment)
- Electromagnetic fuel injection valve 2 ... Valve housing 3 ; Valve seat member 5 ... Fixed core 7 . Valve hole 8 ; Valve seat 12 ... Moveable core 13 ... Valve shaft 13a ... Hollow shaft portion 13b ... Solid shaft portion 14 ; Valve element 15 ... Guide hole 16 ; Tapered hole 17 ⁇ Large-diameter hole 18 ⁇ Channel portion 19 ⁇ First vertical hole 20 ⁇ Second vertical hole 21 ⁇ Horizontal hole 25 ⁇ Cylindrical Flow path 26 ... Fuel inlet cylinder 30 ... Coil
- the fuel injection side is referred to as the front
- the fuel inlet side is referred to as the rear.
- a valve housing 2 of an electromagnetic fuel injection valve I for an engine includes a cylindrical valve seat member 3 and a magnetic cylinder that is fitted to a rear end portion of the valve seat member 3 and is liquid-tightly welded.
- a body 4 a nonmagnetic cylindrical body 6 that is liquid-tightly welded against the rear end of the magnetic cylindrical body 4, and a front end portion is fitted to the inner peripheral surface of the nonmagnetic cylindrical body 6 to be liquid-tight.
- the valve seat member 3 includes a valve hole 7 that opens to the front end surface thereof, a conical valve seat 8 that is connected to the inner end of the valve hole 7, and a large-diameter portion of the valve seat 8. And a cylindrical large-diameter hole 17 having a diameter larger than that of the valve-body guide hole 15 and connected to the rear end of the valve-body guide hole 15 via a taper hole 16. Provided.
- valve element guide hole 15 when the diameter of the valve element guide hole 15 is D1, and the diameter of the large diameter hole 17 is D2, D2 / D1 ⁇ 0.6 (1)
- the valve element guide hole 15 and the large diameter hole 17 are formed so as to satisfy the above expression (1).
- the taper angle ⁇ of the tapered hole 16 is set to 50 ° to 70 °.
- a steel plate injector plate 10 having a plurality of fuel injection holes 11 communicating with the valve hole 7 is welded to the front end face of the valve seat member 3 in a liquid-tight manner.
- a portion that does not fit with the fixed core 5 remains at the front end portion of the nonmagnetic cylindrical body 6, and the valve assembly V is accommodated in the valve housing 2 extending from the portion to the valve seat member 3.
- the valve assembly V has a spherical valve body 14 slidably supported in the guide hole 9 so as to open and close the valve hole 7 in cooperation with the valve seat 8, and the valve body 14 is welded to the valve body 14 by welding.
- a valve shaft 13 to be coupled and a cylindrical movable core 12 that integrally protrudes from the front end of the valve shaft 13 are configured.
- the movable core 12 slides on the inner peripheral surface of the magnetic cylindrical body 4. It has an annular journal portion 12 a that is freely supported, and is opposed to the fixed core 5. Therefore, the valve assembly V is slidably supported on the valve housing 2 at two points of the valve body 14 and the journal portion 12a that are largely separated from each other, so that the opening / closing posture of the valve assembly V is stabilized.
- Around the spherical valve body 14, a plurality of flat flow path portions 18, 18... That allow fuel to pass are formed at equal intervals (see FIG. 3).
- the first fixed hole 5 is provided with a first vertical hole 19 connected to the hollow portion of the fuel inlet cylinder 26.
- the valve assembly V has a second vertical hole 20 that starts from the rear end surface of the movable core 12 and ends at the middle portion of the valve shaft 13, and the second vertical hole 20 is opened to the large-diameter hole 17 of the valve seat member 3. And a single lateral hole 21 is provided.
- the valve shaft 13 protrudes integrally from the front end of the movable core 12, and has a hollow shaft portion 13a having a diameter smaller than that of the movable core 12, the same diameter as the valve body guide hole 15, and the second vertical hole 20.
- the front end of the hollow shaft portion 13a is integrally connected to the front end of the hollow shaft portion 13a via a tapered step portion 13c, and is formed of a solid shaft portion 13b having a smaller diameter than the valve element guide hole 15.
- the hollow shaft portion 13 a has a front end protruding into the valve body guide hole 15 to define a cylindrical flow path 25 between the inner periphery of the valve body guide hole 15. Accordingly, the welded portion between the hollow shaft portion 13 a and the valve body 14 is disposed in the valve body guide hole 15.
- an annular spring seat 24 facing the fixed core 5 is formed in the middle of the second vertical hole 20.
- a pipe-like retainer 23 is press-fitted into the first vertical hole 19 of the fixed core 5, and the movable core 12 is urged toward the valve closing side of the valve body 18 between the retainer 23 and the spring seat 24.
- the valve spring 22 is contracted. At that time, the set load of the valve spring 22 is adjusted by the fitting depth of the retainer 23 into the first vertical hole 19.
- the movable core 12 is embedded with a ring-shaped stopper member 37 made of a nonmagnetic material that slightly protrudes from the rear end surface facing the fixed core 5.
- the stopper member 37 has a predetermined gap between the opposed end surfaces of the fixed core 5 and the movable core 12 by contacting the front end surface of the fixed core 5 when the fixed and movable cores 5 and 12 are attracted to each other. It will be left.
- a coil assembly 28 is fitted to the outer periphery of the soot valve housing 2 so as to correspond to the fixed core 5 and the movable core 12.
- the coil assembly 28 includes a bobbin 29 fitted to the outer peripheral surface from the rear end portion of the magnetic cylindrical body 4 to the fixed core 5, and a coil 30 wound around the bobbin 29.
- a base end portion of the coupler terminal 33 protruding to one side is held, and the terminal of the coil 30 is connected to the coupler terminal 33.
- a synthetic resin primary coating layer 27 covering the outer periphery of the coil assembly 28 is molded so as to embed the coil 30.
- a coupler 34 that receives and holds the coupler terminal 33 and protrudes to one side of the coil assembly 28 is integrally formed with the primary coating layer 27.
- the front and rear ends of a magnetic coil housing 31 surrounding the coil assembly 28 are welded to the outer peripheral surfaces of the magnetic cylindrical body 4 and the fixed core 5.
- High-pressure fuel pumped from a fuel pump (not shown) to the fuel inlet cylinder 26 is filtered by the fuel filter 43, and then the inside of the valve housing 2, that is, the hollow portion of the fuel inlet cylinder 26, the first vertical hole 19 of the fixed core 5, The second vertical hole 20 and the horizontal hole 21 of the valve assembly V, the large-diameter hole 17, the tapered hole 16 and the valve body guide hole 15 of the valve seat member 3 are filled.
- the coil 30 is demagnetized, the valve assembly V is pressed forward by the biasing force of the valve spring 22, and the valve body 18 is seated on the valve seat 8.
- the magnetic flux generated by the coil 30 sequentially travels through the coil housing 31, the magnetic cylindrical body 4, the movable core 12, and the fixed core 5, and the movable core 12 is attracted by the magnetic force generated between the cores 5 and 12. Is attracted to the fixed core 5 against the set load of the valve spring 22 and the valve body 18 is separated from the valve seat 8, so that the valve hole 7 is opened, and the high-pressure fuel in the valve seat member 3 is removed from the valve hole 7. Then, the fuel is injected from a fuel injection hole 11 of the injector plate 10 into a throttle body (not shown) equipped with the electromagnetic fuel injection valve I or an intake passage of an engine.
- the high-pressure fuel that has been waiting in the second vertical hole 20 of the valve assembly V first passes through a single lateral hole 21 provided in the valve shaft 13 and has a large volume with a relatively large volume of the valve seat member 3. Since it flows smoothly to the diameter hole 17 side, there is little pressure loss. Then, the high-pressure fuel transferred to the large-diameter hole 17 is smoothly throttled by the tapered hole 16, guided to the valve body guide hole 15 while increasing the flow velocity, and passes through the plurality of flow path portions 18, 18. Thereafter, the fuel is further throttled by the conical valve seat 8 and further injected at a high speed from the fuel injection hole 11 of the injector plate 10 through the valve hole 7 while increasing the flow velocity, so that the injected fuel is atomized well. be able to.
- the horizontal hole 21 is provided in the valve shaft 13 and only the second vertical hole 20 passes through the movable core 12, it is possible to avoid a decrease in the capacity of the movable core 12 due to the horizontal hole 21, and This can contribute to the downsizing of the electromagnetic fuel injection valve I.
- the lateral hole 21 of the valve shaft 13 is made a single, during the electric discharge machining or machining of the lateral hole 21, the generation of burrs is minimized to simplify the deburring operation and contribute to cost reduction.
- the diameter of the valve shaft 13 can be reduced and the effective volume of the large-diameter hole 17 can be increased accordingly.
- the relationship between the diameter D1 of the valve body guide hole 15 and the diameter of the large diameter hole 17 is D2 / D1 ⁇ 0.6, so that the diameter of the large diameter hole 17 extends from the large diameter hole 17 to the valve body guide hole 15.
- the flow rate of the high-pressure fuel can be increased effectively, and the diameter of the spherical valve body 14 supported in the valve body guide hole 15 can be reduced, and this is a small injection flow type that is particularly effective for small motorcycles and the like.
- a small electromagnetic fuel injection valve I can be provided.
- the taper angle ⁇ of the tapered hole 16 connecting the large-diameter hole 17 and the valve element guide hole 15 is set to 50 ° to 70 °, the flow of high-pressure fuel can be more smoothly restricted in the tapered hole 16.
- the increase in the total length of the valve seat member 3 can be suppressed as much as possible in combination with the expression (1), which can contribute to the compactness of the electromagnetic fuel injection valve I.
- valve shaft 13 has a hollow shaft portion 13a having a second vertical hole 20 having a diameter smaller than that of the movable core 12 and substantially the same diameter as the valve body guide hole 15, and a tapered step portion at the front end of the hollow shaft portion 13a. Since the valve shaft guide hole 15 is integrally formed with the solid shaft portion 13b having a smaller diameter than the valve body guide hole 15, the reduction in thickness and weight of the valve shaft 13 and the securing of strength can be achieved at the same time.
- the front end portion of the hollow shaft portion 13 a is inserted into the valve body guide hole 15 to define a cylindrical flow path 25 between the solid shaft portion 13 b and the inner peripheral surface of the valve body guide hole 15. Therefore, after the flow of the high-pressure fuel constricted by the tapered hole 16 is rectified by the cylindrical flow path 25, it is divided into a plurality of flow path portions 18, 18. Even if there is a single, the flow rate to the flow path portion 18 can be made equal, and the fuel injection direction from the fuel injection hole 11 can be stabilized.
- a groove-like channel portion may be provided on the outer peripheral surface of the valve body 14 instead of the flat channel portion 18.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
2・・・・・弁ハウジング
3・・・・・弁座部材
5・・・・・固定コア
7・・・・・弁孔
8・・・・・弁座
12・・・・可動コア
13・・・・弁軸
13a・・・中空軸部
13b・・・中実軸部
14・・・・弁体
15・・・・ガイド孔
16・・・・テーパ孔
17・・・・大径孔
18・・・・流路部
19・・・・第1縦孔
20・・・・第2縦孔
21・・・・横孔
25・・・・円筒状流路
26・・・・燃料入口筒
30・・・・コイル
D2/D1<0.6・・・・・・(1)
上記(1)式を満足させるように,弁体ガイド孔15及び大径孔17は形成される。
Claims (3)
- 前端に弁座(8)及び弁孔(7)を有する弁座部材(3),固定コア(5),燃料入口筒(26)を前後に連ねてなり内部を燃料流路とする弁ハウジング(2)と,この弁ハウジング(2)の外周に配設され,前記固定コア(5)を励磁すべく通電されるコイル(30)と,前記弁ハウジング(2)に収容され,前記固定コア(5)の消磁及び励磁に伴ない前記弁座(8)と協働して前記弁孔(7)を開閉する弁組立体(V)とを備えてなり,前記弁組立体(V)を,前記弁座(8)に離,着座する,基本形が球状で外周に複数の流路部(18)を有する弁体(14)と,前記弁ハウジング(2)に摺動自在に嵌装される可動コア(12)と,この可動コア(12)の前端にそれより小なる直径をもって一体に突設されて弁体(14)に連結する弁軸(13)とで構成した電磁式燃料噴射弁において,
前記弁座部材(3)に,その弁座(8)に連なり前記弁体(14)を摺動自在に案内する弁体ガイド孔(15)と,この弁体ガイド孔(15)の後端にテーパ孔(16)を介して連なる,弁体ガイド孔(15)より大径の大径孔(17)とを設ける一方,前記燃料入口筒(26)内に連通する第1縦孔(19)を前記固定コア(5)に設け,この第1縦孔(19)に連通する第2縦孔(20)を前記可動コア(12)から前記弁軸(13)に亙り設けると共に,この第2縦孔(20)を前記大径孔(17)に開放する横孔(21)を前記弁軸(13)に設け,前記大径孔(17)の直径D1と前記弁体ガイド孔(15)の直径D2との関係を,D2/D1<0.6とすることを特徴とする電磁式燃料噴射弁。 - 請求項1記載の電磁式燃料噴射弁において,
前記テーパ孔(16)のテーパ角度(θ)を50°~70°に設定したことを特徴とする電磁式燃料噴射弁。 - 請求項1又は2記載の電磁式燃料噴射弁において,
前記弁軸(13)を,前記第2縦孔(20)を有する中空軸部(13a)と,この中空軸部(13a)より小径で且つ中実であって中空軸部(13a)の前端に連なる中実軸部(13b)とで構成し,この中空軸部(13a)の前端部を前記弁体ガイド孔(15)に突入させてこの中空軸部(13a)と前記弁体ガイド孔(15)の内周面との間に円筒状流路(25)を画成したことを特徴とする電磁式燃料噴射弁。
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US13/386,470 US8727243B2 (en) | 2009-07-27 | 2010-05-21 | Electromagnetic fuel injection valve |
CN201080032807.3A CN102472216B (zh) | 2009-07-27 | 2010-05-21 | 电磁式燃料喷射阀 |
EP10804183.1A EP2461013B1 (en) | 2009-07-27 | 2010-05-21 | Electromagnetic fuel injection valve |
BR112012000963-0A BR112012000963B1 (pt) | 2009-07-27 | 2010-05-21 | válvula eletromagnética de injeção de combustível |
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JP2009173905A JP5363228B2 (ja) | 2009-07-27 | 2009-07-27 | 電磁式燃料噴射弁 |
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US8234935B2 (en) * | 2010-10-28 | 2012-08-07 | Hamilton Sundstrand Corporation | Anti-rotation mechanism for pitot tube |
EP2811149A1 (en) * | 2013-06-05 | 2014-12-10 | Continental Automotive GmbH | Sealing body and needle for a fluid injection valve |
EP3933860B1 (en) * | 2016-04-08 | 2022-12-07 | Eagle Industry Co., Ltd. | Solenoid |
DE102018200357A1 (de) * | 2018-01-11 | 2019-07-11 | Robert Bosch Gmbh | Ventil zum Zumessen eines Fluids, insbesondere Brennstoffeinspritzventil |
JP6888146B1 (ja) * | 2020-03-27 | 2021-06-16 | 日立Astemo株式会社 | 直噴式燃料噴射弁 |
CN112648429B (zh) * | 2020-12-31 | 2022-11-01 | 中国航发长春控制科技有限公司 | 一种螺旋杆支撑钢球阀套组合电磁阀结构 |
JP7482073B2 (ja) * | 2021-03-22 | 2024-05-13 | 日立Astemo株式会社 | 電磁式燃料噴射弁 |
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JP2001115923A (ja) | 1999-10-13 | 2001-04-27 | Keihin Corp | 電磁式燃料噴射弁 |
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WO2008117459A1 (ja) * | 2007-03-27 | 2008-10-02 | Mitsubishi Electric Corporation | 燃料噴射弁 |
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JP3913841B2 (ja) * | 1997-07-02 | 2007-05-09 | 本田技研工業株式会社 | 噴射弁 |
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JP2005113815A (ja) * | 2003-10-08 | 2005-04-28 | Keihin Corp | 燃料噴射弁 |
US7048202B2 (en) * | 2004-03-04 | 2006-05-23 | Siemens Vdo Automotive Corporation | Compound-angled orifices in fuel injection metering disc |
JP3955043B2 (ja) * | 2004-06-29 | 2007-08-08 | 株式会社ケーヒン | 電磁式燃料噴射弁の製造方法 |
US20070131803A1 (en) * | 2005-12-13 | 2007-06-14 | Phadke Milind V | Fuel injector having integrated valve seat guide |
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JP2001115923A (ja) | 1999-10-13 | 2001-04-27 | Keihin Corp | 電磁式燃料噴射弁 |
JP2007032342A (ja) * | 2005-07-25 | 2007-02-08 | Hitachi Ltd | 燃料噴射弁 |
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US20120160938A1 (en) | 2012-06-28 |
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CN102472216B (zh) | 2014-05-28 |
CN102472216A (zh) | 2012-05-23 |
EP2461013A4 (en) | 2013-05-22 |
BR112012000963A8 (pt) | 2016-10-04 |
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EP2461013B1 (en) | 2014-11-12 |
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