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EP0676542A1 - Injecteur électromagnétique de carburant - Google Patents

Injecteur électromagnétique de carburant Download PDF

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Publication number
EP0676542A1
EP0676542A1 EP95103809A EP95103809A EP0676542A1 EP 0676542 A1 EP0676542 A1 EP 0676542A1 EP 95103809 A EP95103809 A EP 95103809A EP 95103809 A EP95103809 A EP 95103809A EP 0676542 A1 EP0676542 A1 EP 0676542A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
valve housing
membrane
injection valve
valve according
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
Application number
EP95103809A
Other languages
German (de)
English (en)
Other versions
EP0676542B1 (fr
Inventor
Uwe Dipl.-Ing. Grytz
Ulrich Dipl.-Ing. Vieweg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0676542A1 publication Critical patent/EP0676542A1/fr
Application granted granted Critical
Publication of EP0676542B1 publication Critical patent/EP0676542B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/007—Venting means

Definitions

  • the invention relates to an electromagnetically actuated fuel injector according to the preamble of the main claim.
  • Numerous fuel injection valves are already known, also from EP-PS 0 348 786, which have an electrical connector, via which the electrical contacting of a solenoid coil and thus its excitation takes place. The contacting itself takes place via metallic contact pins, which run from the magnetic coil to the actual connector and are largely extrusion-coated with plastic.
  • the molded contact pins are not completely sealed. Rather, the finest capillary gaps form between the contact pins and the plastic encapsulation. This effect is particularly intensified when exposed to heat, since the different coefficients of thermal expansion of plastic and metal lead to material shifts.
  • the internal combustion engine and also the heating of the Magnetic coil causes a temperature increase in the area of the magnetic coil and connector, which in turn increases the formation of capillary gaps.
  • the finest capillary gaps ensure that there are direct connections between the air enclosed between the coil carrier and the valve housing and the atmosphere existing outside the fuel injector, so that the fuel injector can "breathe".
  • a pressure equalization between the outside atmosphere and inside air depending on the temperature can inevitably take place.
  • the volume expansion of the solenoid coil and the enclosed air reduce the internal pressure to the outside via the capillary gaps, so that a pressure balance is maintained.
  • the pressure equalization takes place in the opposite direction, so that ambient air gets into the valve interior, a high level of humidity being particularly disadvantageous.
  • the risk of moisture entering the interior of the fuel injector is particularly great when the internal combustion engine is at high risk of splashing water, as may be the case. a. is the case with rear engines of motor vehicles or extreme environmental conditions prevail. The result is corrosion on the contact pins and the coil wire, which can lead to the destruction of the coil wire.
  • the fuel injector according to the invention with the characterizing features of the main claim has the advantage that by creating a targeted Pressure equalization between the outer atmosphere and the coil space is achieved that no moisture penetrates into the interior of the valve, so that corrosion on the contact pins and the coil wire and thus destruction of the same is excluded.
  • a temperature- and fuel-resistant membrane with high elasticity which consists of a fluorocarbon elastomer (FKM), fluorosilicone or nitrile butadiene rubber (NBR, HNBR).
  • FKM fluorocarbon elastomer
  • NBR fluorosilicone
  • HNBR nitrile butadiene rubber
  • semipermeable tissue e.g. use the fabric known under the trademark Goretex®, as this guarantees that no moisture can penetrate inside.
  • FIG. 1 shows a fuel injection valve with a first pressure compensation element according to the invention
  • FIG. 2 shows a detail of a fuel injection valve with a second pressure compensation element according to the invention
  • FIG. 3 shows a section along line III-III in FIG. 1 through a pressure compensation element according to the invention.
  • the electromagnetically actuated fuel injection valve for fuel injection systems of internal combustion engines has a tubular valve housing 1 made of a ferromagnetic material, in which a magnet coil 3 is arranged on a coil carrier 2.
  • the coil carrier 2 partially surrounds a step-shaped core 4, which is concentric with a valve longitudinal axis 7 and is tubular and via which the fuel is supplied.
  • the valve housing 1 At its end remote from the solenoid 3, the valve housing 1 partially encloses a nozzle body 6 in the axial direction.
  • an annular groove 10 is formed on the circumference of the nozzle body 6, in which a sealing ring 11 is arranged.
  • a stop plate 16 is clamped between an end face 13 of the nozzle body 6 facing the solenoid 3 and an inner shoulder 15 of the valve housing 1 opposite the end face 13 in the axial direction and serves in a stepped longitudinal opening 18 of the valve housing 1 projecting valve needle 21.
  • Two guide sections 22 of the valve needle 21, for example designed as a square, are guided through the guide region of the longitudinal bore 17; but they also leave an axial passage for the fuel.
  • the valve needle 21 penetrates a through opening 23 of the stop plate 16 with radial play and protrudes at its downstream end with a needle pin 25 from an injection opening 26 of the nozzle body 6.
  • a frustoconical seat surface 28 is formed on the nozzle body 6, which cooperates with an end of the valve needle 21 serving as a valve closing part and causes the fuel injector to open or close.
  • valve needle 21 is fixedly connected to a tubular armature 30 in that the armature 30 engages around a holding part 33 of the valve needle 21 with an area 32 facing the seat surface 28.
  • a return spring 37 rests with one end on a shoulder 34 of armature 30 facing magnet coil 3. With its other end, the return spring 37 is supported on a tubular adjusting sleeve 40, which is pressed into a stepped through bore 41 of the core 4.
  • the core 4 and the valve housing 1 are at least partially enclosed in the axial direction by a plastic casing 43.
  • An electrical connector 45 via which the electrical contacting of the magnetic coil 3 and thus its excitation takes place, is formed, for example, together with the plastic casing 43.
  • the connector 45 made of plastic includes, for example, two metallic contact pins 46 which are directly connected to the winding of the magnetic coil 3.
  • the contact pins 46 protrude in the direction facing away from the seat surface 28 from the coil carrier 2 surrounding the magnet coil 3 and are largely extrusion-coated with plastic. Only at their pin end 47 are the contact pins 46 exposed; they are therefore not directly surrounded by plastic, so that a plug connection with a corresponding plug part, not shown, is possible.
  • a pressure equalization between the outside atmosphere and inside air depending on the temperature can inevitably take place.
  • the volume expansion of the magnetic coil 3 and the enclosed air reduce the internal pressure to the outside via the capillary gaps, so that a pressure balance is maintained.
  • the pressure equalization takes place in the opposite direction, so that ambient air gets into the valve interior, with a high humidity of the sucked-in air being particularly disadvantageous.
  • the risk of moisture entering the interior of the fuel injector is particularly great if the internal combustion engine is at high risk of splashing water, as is the case, inter alia, with rear engines of motor vehicles or extreme environmental conditions prevail. Since not only pure water can be sucked into the capillary gaps, but also other particles can be taken along, the corrosion in the coil space can even be accelerated, so that destruction of the coil wire cannot be ruled out.
  • this problem is solved by at least one, for example two, transverse bores 50 made in the axial extension area of the magnet coil 3 in the wall of the valve housing 1.
  • the transverse bores 50 now specifically take on the pressure equalization between the outside atmosphere and the valve interior, which has a negative effect via the capillary gaps.
  • the number of cross bores 50 depends on the specific valve configuration, so that more than two cross bores 50 may also be desired.
  • a pressure compensation element for example a pressure compensation element, is placed on the valve housing 1 in a circumferential annular groove 52, from which the transverse bores 50 extend in the direction of the magnetic coil 3.
  • an annular membrane 53 which is made of a rubber, slipped on. The membrane 53 completely covers the transverse bores 50 in the valve housing 1 in the installed position.
  • an annular groove it is not necessary for an annular groove to be provided on the circumference of the valve housing 1. Rather, it is crucial that the transverse bores 50 are covered in some form by the membrane 53.
  • the membrane 53 has areas of thicker and thinner cross section, which alternate in each case.
  • the areas of thicker cross section represent stiffening sections 54 represents the stability and rigidity of the membrane 53 is significantly increased.
  • These stiffening sections 54 can, for example, alternate between one and six times with the areas of thinner cross section, which are designed as highly flexible membrane walls 55.
  • the membrane 53 In the axial direction above and below the thin membrane walls 55, the membrane 53 is provided in the form of a membrane-bounding membrane edges 57 which, for example, have the same thickness as the stiffening sections 54 and, because of their high radial tension, ensure an optimal fit of the membrane 53 in the annular groove 52.
  • a membrane wall 55 must cover at least one transverse bore 50, which can easily be achieved by the ratio of the number of transverse bores 50 to the number of membrane walls 55.
  • the membrane 53 Various demands are placed on the quality of the membrane 53. So it must have the ability to compensate for even slight pressure fluctuations through its mobility.
  • the thin, highly flexible membrane walls 55 move radially outward and minimally lift off the valve housing 1, while when the interior of the valve cools down and a possible negative pressure occurs, the membrane walls 55 are drawn back to the valve housing 1 or are drawn into the transverse bores 50 to a small extent.
  • the membrane edges 57 each seal due to their constant tight contact with the valve housing 1.
  • the material of the membrane 53 must also be fuel and temperature resistant.
  • nitrile butadiene rubber NBR, HNBR
  • fluorocarbon elastomer FKM
  • fluorosilicone are suitable for the membrane 53.
  • the membrane 53 thus enables pressure equalization without there is a risk of moisture penetrating into the valve interior and prevents negative capillary flows.
  • FIG. 2 shows a second exemplary embodiment of a pressure compensation element covering transverse bores 50 according to the invention.
  • the thin membrane walls 55 by a fabric 55 'of semi-permeable material, for. B. replaced the fabric known under the trademark Goretex®.
  • the tissue 55 ' is introduced in such a way that it acts as a vapor barrier from the outside inwards, but it can also transport z. B. of water vapor from the inside out. A gas exchange can thus be realized, with no moisture getting inside the valve.
  • the semipermeable fabric 55 ' can be cast in a carrier body 53' made of plastic, which for example has the same shape as the membrane 53 in the first embodiment.
  • the carrier body 53 'with the fabric 55' can be fastened to the valve housing 1, for example, by clipping into the annular groove 52.
  • the number of cross bores 50 and the areas of thinner cross-section can again be made variable.

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)
EP95103809A 1994-04-09 1995-03-16 Injecteur électromagnétique de carburant Expired - Lifetime EP0676542B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4412277A DE4412277A1 (de) 1994-04-09 1994-04-09 Elektromagnetisch betätigbares Brennstoffeinspritzventil
DE4412277 1994-04-09

Publications (2)

Publication Number Publication Date
EP0676542A1 true EP0676542A1 (fr) 1995-10-11
EP0676542B1 EP0676542B1 (fr) 1998-11-11

Family

ID=6515008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103809A Expired - Lifetime EP0676542B1 (fr) 1994-04-09 1995-03-16 Injecteur électromagnétique de carburant

Country Status (5)

Country Link
US (1) US5685493A (fr)
EP (1) EP0676542B1 (fr)
JP (1) JPH07279795A (fr)
DE (2) DE4412277A1 (fr)
ES (1) ES2123845T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1037570C2 (en) * 2009-12-18 2011-06-21 Heinmade B V A device for dispensing a substance.
CN101978157B (zh) * 2008-03-19 2013-06-12 罗伯特·博世有限公司 密封的电引线孔

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5996628A (en) * 1996-01-16 1999-12-07 Saturn Electronics & Engineering, Inc. Proportional variable force solenoid control valve
DE19853091A1 (de) * 1998-11-18 2000-05-25 Bosch Gmbh Robert Brennstoffeinspritzventil
JP2001082283A (ja) * 1999-09-20 2001-03-27 Hitachi Ltd 電磁式燃料噴射弁
KR100602742B1 (ko) * 2001-07-10 2006-07-20 니혼 덴산 산쿄 가부시키가이샤 밸브구동장치
US7255286B2 (en) * 2004-03-19 2007-08-14 Carleton Technologies, Inc. Temperature compensation valve
DE102004042351B4 (de) * 2004-08-20 2008-09-11 Continental Automotive Gmbh Abdichtungsanrordnung eines Piezoaktors für ein Kraftstoffeinspritzventil einer Brennkraftmaschine
DE502004004656D1 (de) * 2004-08-20 2007-09-27 Siemens Ag Abdichtungsanordnung eines Piezoaktors eines Kraftstoffinjektors
EP1628016B1 (fr) * 2004-08-20 2008-04-23 VDO Automotive AG Actionneur d'un injecteur de carburant d'un moteur à combustion interne
DE102004047179A1 (de) * 2004-09-29 2006-03-30 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102005051287B4 (de) * 2005-10-26 2007-10-04 Siemens Ag Piezoaktuatorvorrichtung für ein Kraftstoffeinspritzventil
DE102005051288B4 (de) * 2005-10-26 2007-08-02 Siemens Ag Piezoaktuatorvorrichtung für ein Kraftstoffeinspritzventil
CN209164045U (zh) * 2018-11-19 2019-07-26 浙江锐韦机电科技有限公司 泵阀一体机构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212982A (en) * 1987-11-24 1989-08-02 Weber Srl Coils for fuel injection valves
EP0348786A2 (fr) * 1988-06-28 1990-01-03 Siemens Aktiengesellschaft Soupape électromagnétique d'injection de combustible
WO1991011611A2 (fr) * 1990-02-03 1991-08-08 Robert Bosch Gmbh Soupape a commande electromagnetique
DE4006465A1 (de) * 1990-03-01 1991-09-05 Fraunhofer Ges Forschung Vorrichtung zur ent- und belueftung eines treibstofftankes
DE4038142C1 (en) * 1990-11-30 1992-04-09 Pierburg Gmbh, 4040 Neuss, De Fuel injection valve for IC-engine - has spring loaded valve closure with magnetic actuator and throttled duct

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146112A (en) * 1977-10-31 1979-03-27 General Electric Company Sound reducing baffle for electrical apparatus
DE3844453C2 (de) * 1988-12-31 1996-11-28 Bosch Gmbh Robert Ventil zum dosierten Zumischen von verflüchtigtem Kraftstoff zum Kraftstoffluftgemisch einer Brennkraftmaschine
IT1250845B (it) * 1991-10-11 1995-04-21 Weber Srl Valvola dosatrice e polverizzatrice di carburante ad azionamento elettromagnetico per un dispositivo di alimentazione di un motore endotermico

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212982A (en) * 1987-11-24 1989-08-02 Weber Srl Coils for fuel injection valves
EP0348786A2 (fr) * 1988-06-28 1990-01-03 Siemens Aktiengesellschaft Soupape électromagnétique d'injection de combustible
WO1991011611A2 (fr) * 1990-02-03 1991-08-08 Robert Bosch Gmbh Soupape a commande electromagnetique
DE4006465A1 (de) * 1990-03-01 1991-09-05 Fraunhofer Ges Forschung Vorrichtung zur ent- und belueftung eines treibstofftankes
DE4038142C1 (en) * 1990-11-30 1992-04-09 Pierburg Gmbh, 4040 Neuss, De Fuel injection valve for IC-engine - has spring loaded valve closure with magnetic actuator and throttled duct

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101978157B (zh) * 2008-03-19 2013-06-12 罗伯特·博世有限公司 密封的电引线孔
NL1037570C2 (en) * 2009-12-18 2011-06-21 Heinmade B V A device for dispensing a substance.
WO2011074970A1 (fr) * 2009-12-18 2011-06-23 Heinmade B.V. Dispositif pour distribuer une substance

Also Published As

Publication number Publication date
JPH07279795A (ja) 1995-10-27
EP0676542B1 (fr) 1998-11-11
DE4412277A1 (de) 1995-10-12
ES2123845T3 (es) 1999-01-16
DE59504182D1 (de) 1998-12-17
US5685493A (en) 1997-11-11

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