EP0659235A1 - Electromagnetically controllable fuel injection valve. - Google Patents
Electromagnetically controllable fuel injection valve.Info
- Publication number
- EP0659235A1 EP0659235A1 EP93918903A EP93918903A EP0659235A1 EP 0659235 A1 EP0659235 A1 EP 0659235A1 EP 93918903 A EP93918903 A EP 93918903A EP 93918903 A EP93918903 A EP 93918903A EP 0659235 A1 EP0659235 A1 EP 0659235A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve seat
- seat support
- needle
- fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
-
- 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
- F02M61/166—Selection of particular materials
-
- 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 invention is based on an electromagnetically actuated fuel injector according to the preamble of the main claim.
- an electromagnetically actuated injection valve for fuel injection systems of mixture-compressing externally ignited internal combustion engines is already known, in which a valve seat carrier and a valve needle made of the same material, for example chrome steel.
- valve components including the valve seat carrier and valve needle
- the valve seat support and the valve needle are made of the same material, both valve components also have similar coefficients of thermal expansion, for example in the case of chrome steel the value is approx. 16x10 K.
- the length changes of the valve seat carrier and the valve needle are similar when the valve is heated.
- the valve lift of the valve needle therefore remains largely constant in the event of temperature fluctuations in the internal combustion engine.
- This two-phase flow is disadvantageous in that it inevitably leads to a reduction in the metered fuel and thus to a so-called thinning of the fuel-air mixture supplied to the internal combustion engine.
- a rise in temperature in the interior of the internal combustion engine therefore has the consequence that when using the same materials with similar thermal expansion coefficients for the valve seat support and valve needle in the injection valve, the amount of fuel dispensed is reduced.
- the injection valve according to the invention with the characterizing features of the main claim has the advantage that the flow reduction of the added fuel due to the formation of gas bubbles in the hot fuel is reduced and partially compensated for by a suitable choice of material. It is expedient to use a material with a very low coefficient of thermal expansion, for example Invar steel, for the valve needle.
- the material Invar steel is characterized by its nickel content of 36% and has the extremely small coefficient of thermal expansion.
- the valve seat support is formed from two valve seat support sections, the valve seat support section directed towards a magnetic coil being made, as already known, from a magnetic material, for example chrome steel, in order to ensure the magnetic flux in the magnetic circuit, and that to form a valve closing body
- Directional valve seat support section consists of brass or an aluminum alloy.
- FIG. 1 shows a partially illustrated fuel injection valve according to a first exemplary embodiment
- FIG. 2 shows a fuel injection valve according to a second exemplary embodiment. Description of the embodiments
- FIG. 1 a valve in the form of an injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines is partially shown as a first exemplary embodiment.
- the injection valve has a tubular valve seat support 1, in which a longitudinal bore 3 is formed concentrically with a valve longitudinal axis 2.
- a longitudinal bore 3 is formed concentrically with a valve longitudinal axis 2.
- tubular valve needle 6 arranged at its downstream end 7 with a e.g. spherical valve closing body 8 is connected.
- the injection valve is actuated in a known manner, for example electromagnetically.
- An electromagnetic circuit with a magnetic coil 10, a core 11 and an armature 12 is used only for the axial movement of the valve needle 6 and thus for opening against the spring force of a return spring 20 or closing the injection valve is connected to the end of the valve needle 6 facing away from the valve closing body 8 by a first weld seam 14 and is aligned with the core 11.
- the magnetic coil 10 surrounds the core 11, which represents the end of a fuel inlet connection piece, which is enclosed by the magnetic coil 10, and which serves to supply the medium to be metered by means of the valve, here fuel.
- the magnetic coil 10 with a coil body 16 is provided with a plastic encapsulation 17, at the same time an electrical connector (not shown) being molded on.
- a tubular, metallic intermediate part 19 is connected, for example by welding, concentrically to the longitudinal valve axis 2 and thereby overlaps it End of the core 11 partially axially.
- the intermediate part 19 is provided at its end facing away from the core 11 with a lower cylinder section 18 which engages over the tubular valve seat support 1 and is tightly connected to it, for example by a second weld seam 15.
- a lower end face 35 of the core 11 facing the armature 12 rests on a shoulder 36 of the intermediate part 19 leading to the upper cylinder section.
- valve seat carrier 1 In the downstream end of the valve seat carrier 1 facing away from the core 11, a cylinder-shaped valve seat body 25 is tightly mounted in the longitudinal bore 3, which runs concentrically with the valve longitudinal axis 2, by welding.
- the valve seat body 25 has a fixed valve seat 26 facing the core 11.
- the magnetic coil 10 is at least partially surrounded in the circumferential direction by at least one guide element 30, which is designed, for example, as a bracket and serves as a ferromagnetic element. is connected by welding, soldering or an adhesive connection.
- the plastic encapsulation 17 can serve to hold the at least one guide element 30.
- a guide opening 31 of the valve seat body 25 serves to guide the valve closing body 8 during the axial movement.
- the circumference of the valve seat body 25 has a slightly smaller diameter than the diameter of the longitudinal bore 3 of the valve seat carrier 1.
- Front side 32 of valve seat body 25 is concentrically and firmly connected to a bottom part 33 of, for example, a cup-shaped spray orifice plate 34, so that bottom part 33 rests with its upper end face 44 on lower end face 32 of valve seat body 25.
- the connection of valve seat body 25 and spray orifice plate 34 takes place, for example, by a rotating one and tight, for example by means of a laser-formed third weld seam 45.
- This type of assembly avoids the risk of undesired deformation of the base part 33 in the region of its at least one, for example four, spray openings 46 formed by eroding or punching.
- a peripheral holding edge 47 adjoins the base part 33 of the cup-shaped spray perforated disk 34, which extends away from the valve seat body 25 in the axial direction and is conically bent outwards up to its end 48.
- the diameter of the retaining edge 47 at its end 48 is larger than the diameter of the longitudinal bore 3 in the valve seat support 1. Since the circumferential diameter of the valve seat body 25 is smaller than the diameter of the longitudinal bore 3 of the valve seat support 1, there is only between the longitudinal bore 3 and the a conical outwardly bent retaining edge 47 of the spray hole disk 34 a radial pressure.
- valve seat part consisting of valve seat body 25 and cup-shaped spray orifice plate 34 into the longitudinal bore 3 determines the presetting of the stroke of the valve needle 6, since the one end position of the valve needle 6 when the solenoid coil 10 is not excited due to the valve closing body 8 resting on the surface of the valve seat 26 Valve seat body 25 is fixed.
- the other end position of the valve needle 6 is determined when the magnet coil 10 is excited, for example by the abutment of an upper end face 22 of the armature 12 on the lower end face 35 of the core 11. The path between these two end positions of the valve needle 6 represents the stroke.
- the holding edge 47 of the spray plate 34 is connected to the wall of the longitudinal bore 3 by a circumferential and tight fourth weld seam 49.
- the method of laser welding is possible for attaching all of the described weld seams 14, 15, 45, 49. Tight welds are required so that the medium used, for example a fuel, cannot flow between the longitudinal bore 3 of the valve seat support 1 and the circumference of the valve seat body 25 or the holding edge 47 of the spray plate 34 through to the spray openings 46 or into an intake line of the internal combustion engine.
- the spherical valve closing body 8 interacts with the surface of the valve seat 26 of the valve seat body 25 which tapers in the direction of a truncated cone and is formed in the axial direction between the guide opening 31 and the lower end face 32 of the valve seat body 25.
- the guide opening 31 has at least one flow passage 27 which allows the medium to flow from the valve interior 50, which is delimited in the radial direction by the longitudinal bore 3, to an annular groove 52 formed in the flow direction between the guide opening 31 and the valve seat 26 of the valve seat body 25, which in the open state of the valve communicates with the spray openings 46 in the spray orifice plate 34.
- a protective cap 55 is arranged on the periphery of the valve seat carrier 1 at its downstream end facing away from the solenoid 10 and is connected to the valve seat carrier 1 by means of a latching connection 56.
- the protective cap 55 lies both on a lower end face 57 of the valve seat carrier 1 and on the circumference of the valve seat carrier 1 above the latching connection 56.
- a sealing ring 58 is arranged in an annular groove 59, the side surfaces of which are formed by an end face 60 of the protective cap 55 facing the solenoid 10 and by a radially outwardly facing surface 61 of the valve seat support 1 and the groove base 62 thereof by the circumference of the valve seat support 1 become.
- the sealing ring 58 serves to seal between the circumference of the injection valve and a valve receptacle (not shown), for example the intake line of the internal combustion engine.
- a valve receptacle for example the intake line of the internal combustion engine.
- the valve according to the invention is intended to contribute, by a suitable selection of materials with certain coefficients of thermal expansion, to increasing the stroke of the valve needle 6 when the valve is heated and thus increasing the metered quantities of medium compared to the quantities of medium known injection valves with conventional material pairings.
- valve seat support 1 and the valve needle 6 The same material, for example chrome steel, is usually used for the valve seat support 1 and the valve needle 6. It can be assumed that when the temperature of the fuel and the internal combustion engine increases, the components of the valve also assume an elevated temperature. Since the valve seat support 1 and the valve needle 6 have so far been made of the same material, these two valve components also have similar thermal expansion coefficients; for stainless steel, ⁇ approx. 16x10 K applies. As a result, the changes in length of the valve seat carrier 1 and the valve needle 6 are similar when the valve is heated. As the temperature of the valve increases, the stroke of the valve needle 6 in the valve thus remains largely constant.
- chrome steel chrome steel
- Invar steel is a material which is distinguished by its special nickel content.
- the material Invar steel has a minimal thermal expansion and is therefore often used for measuring tools, because of the very low coefficient of thermal expansion of the material Invar steel for the valve needle 6, the valve needle 6 expands in relation to the valve seat carrier As a result, when the fuel injection valve is heated by this material pair, the stroke of the valve needle 6 is increased compared to the valve seat 26.
- the stroke throttle portion of the valve seat 26 is reduced by the increase in stroke amount of fuel flowing through compared to known valves.
- a 10 ⁇ m stroke increase means approximately 2 to 4% flow increase. This can partially compensate for the reduction in the amount of fuel flowing through the gas bubbles in the hot fuel.
- FIG. 2 in which the parts that remain the same or function the same as in the exemplary embodiment shown in FIG. 1 are identified by the same reference numerals, a second exemplary embodiment of a valve in the form of an injection valve for fuel injection systems of externally ignited internal combustion engines is partially shown.
- the valve seat support 1 consists of two valve seat support sections 1 a and 1 b, which are made of different materials and therefore have different coefficients of thermal expansion, at least one of which must be larger than that of the valve needle 6.
- the valve seat support section 1a which faces the solenoid 10, is made of chromium steel with a thermal expansion coefficient of Ct approx. 16x10 K, as in the first embodiment, so that the magnetic flux in the magnetic circuit around the solenoid 10 between the armature 12 and the guide element 30 is closed remains.
- the second valve seat support section 1b which follows in the direction of the valve closing body 8 is produced from a material with a greater coefficient of thermal expansion than that of the material for the valve seat support section la.
- a tight connection 5 of the valve seat support sections la and lb can be achieved, for example, by brazing or resistance welding.
- valve needle 6 As a further variant of the material used for the valve seat support 1 and the valve needle 6, it is conceivable to manufacture the valve needle 6 from chromium steel, for example, as previously known, in contrast to the two previous exemplary embodiments.
- chromium steel for example, as previously known, in contrast to the two previous exemplary embodiments.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4229730A DE4229730A1 (en) | 1992-09-05 | 1992-09-05 | Electromagnetically actuated fuel injector |
DE4229730 | 1992-09-05 | ||
PCT/DE1993/000760 WO1994005907A1 (en) | 1992-09-05 | 1993-08-20 | Electromagnetically controllable fuel injection valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0659235A1 true EP0659235A1 (en) | 1995-06-28 |
EP0659235B1 EP0659235B1 (en) | 1997-05-28 |
Family
ID=6467335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93918903A Expired - Lifetime EP0659235B1 (en) | 1992-09-05 | 1993-08-20 | Electromagnetically controllable fuel injection valve |
Country Status (6)
Country | Link |
---|---|
US (2) | US5921469A (en) |
EP (1) | EP0659235B1 (en) |
JP (1) | JP3662019B2 (en) |
KR (1) | KR100304473B1 (en) |
DE (2) | DE4229730A1 (en) |
WO (1) | WO1994005907A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5465910A (en) * | 1994-08-18 | 1995-11-14 | Siemens Automotive Corporation | Overmolded cover for fuel injector power group and method |
DE19739850A1 (en) * | 1997-09-11 | 1999-03-18 | Bosch Gmbh Robert | Electromagnetically actuated valve |
JPH11141693A (en) * | 1997-11-07 | 1999-05-25 | Asuka Kogyo Kk | Austenite stainless steel valve |
JP4693077B2 (en) * | 2000-12-06 | 2011-06-01 | 臼井国際産業株式会社 | Dust-proof protective cap for thin and thick pipes |
US6840268B2 (en) * | 2002-05-23 | 2005-01-11 | Detroit Diesel Corporation | High-pressure connector having an integrated flow limiter and filter |
JP2006022727A (en) * | 2004-07-08 | 2006-01-26 | Aisan Ind Co Ltd | Fuel injection valve |
DE102010042044A1 (en) * | 2010-10-06 | 2012-04-12 | Robert Bosch Gmbh | fuel injector |
JP5862941B2 (en) * | 2011-11-08 | 2016-02-16 | 株式会社デンソー | Fuel injection valve |
DE102012214522B3 (en) * | 2012-08-15 | 2014-03-27 | Ford Global Technologies, Llc | Injector |
JP6061074B2 (en) * | 2012-09-28 | 2017-01-18 | 株式会社ケーヒン | Fuel injection valve |
DE102014200884A1 (en) * | 2014-01-20 | 2015-07-23 | Robert Bosch Gmbh | fuel injector |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3454042A (en) * | 1966-08-12 | 1969-07-08 | James P Phillips | Portable car wash machine |
GB1186310A (en) * | 1968-11-29 | 1970-04-02 | Standard Telephones Cables Ltd | A Magnetic Recording Device. |
US3604632A (en) * | 1969-11-12 | 1971-09-14 | Golconda Corp | Flame cutting tip |
AT353558B (en) * | 1976-10-04 | 1979-04-15 | Friedmann & Maier Ag | FUEL INJECTION DEVICE FOR INJECTION COMBUSTION MACHINES |
US4116389A (en) * | 1976-12-27 | 1978-09-26 | Essex Group, Inc. | Electromagnetic fuel injection valve |
US4125119A (en) * | 1977-03-25 | 1978-11-14 | Haas Elwood L | High pressure cleaning device |
US4152903A (en) * | 1978-04-13 | 1979-05-08 | Air Products And Chemicals, Inc. | Bimaterial demand flow cryostat |
GB1601306A (en) * | 1978-05-08 | 1981-10-28 | Philips Electronic Associated | Fluidcontrol valve |
US4483485A (en) * | 1981-12-11 | 1984-11-20 | Aisan Kogyo kabuskiki Kaisha | Electromagnetic fuel injector |
US4564145A (en) * | 1982-08-04 | 1986-01-14 | Aisan Kogyo Kabushiki Kaisha | Electromagnetic fuel injector |
US4668227A (en) * | 1985-05-08 | 1987-05-26 | Kay Dennis M | Stoma hygiene system and process therefor |
DE3530954A1 (en) * | 1985-08-29 | 1987-03-12 | Oberdorfer G Wap Masch | HIGH PRESSURE CLEANER |
US5217698A (en) * | 1986-02-06 | 1993-06-08 | Steris Corporation | Office size instrument sterilization system |
JPH0612105B2 (en) * | 1986-09-22 | 1994-02-16 | いすゞ自動車株式会社 | Injection nozzle structure |
US4798329A (en) * | 1987-03-03 | 1989-01-17 | Colt Industries Inc. | Combined fuel injector and pressure regulator assembly |
FR2613627A1 (en) * | 1987-04-13 | 1988-10-14 | Perrot Jean | DEVICE FOR CLEANING AND DISINFECTING MEDICAL AND SURGICAL INSTRUMENTS |
JP2708470B2 (en) * | 1988-06-08 | 1998-02-04 | 株式会社日立製作所 | Electromagnetic fuel injection valve |
DE3831196A1 (en) * | 1988-09-14 | 1990-03-22 | Bosch Gmbh Robert | ELECTROMAGNETICALLY ACTUABLE VALVE |
US4946107A (en) * | 1988-11-29 | 1990-08-07 | Pacer Industries, Inc. | Electromagnetic fuel injection valve |
DE4008675A1 (en) * | 1990-03-17 | 1991-09-19 | Bosch Gmbh Robert | ELECTROMAGNETICALLY ACTUABLE VALVE |
US5405085A (en) * | 1993-01-21 | 1995-04-11 | White; Randall R. | Tuneable high velocity thermal spray gun |
-
1992
- 1992-09-05 DE DE4229730A patent/DE4229730A1/en not_active Withdrawn
-
1993
- 1993-08-20 US US08/397,163 patent/US5921469A/en not_active Expired - Fee Related
- 1993-08-20 EP EP93918903A patent/EP0659235B1/en not_active Expired - Lifetime
- 1993-08-20 DE DE59306608T patent/DE59306608D1/en not_active Expired - Lifetime
- 1993-08-20 KR KR1019950700845A patent/KR100304473B1/en not_active IP Right Cessation
- 1993-08-20 JP JP50673994A patent/JP3662019B2/en not_active Expired - Fee Related
- 1993-08-20 WO PCT/DE1993/000760 patent/WO1994005907A1/en active IP Right Grant
-
1998
- 1998-08-21 US US09/137,785 patent/US5957390A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9405907A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE4229730A1 (en) | 1994-03-10 |
US5957390A (en) | 1999-09-28 |
JP3662019B2 (en) | 2005-06-22 |
DE59306608D1 (en) | 1997-07-03 |
KR950703120A (en) | 1995-08-23 |
US5921469A (en) | 1999-07-13 |
KR100304473B1 (en) | 2002-07-12 |
EP0659235B1 (en) | 1997-05-28 |
JPH08500876A (en) | 1996-01-30 |
WO1994005907A1 (en) | 1994-03-17 |
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