DE10343950B4 - Fuel injector - Google Patents

Fuel injector

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Publication number
DE10343950B4
DE10343950B4 DE2003143950 DE10343950A DE10343950B4 DE 10343950 B4 DE10343950 B4 DE 10343950B4 DE 2003143950 DE2003143950 DE 2003143950 DE 10343950 A DE10343950 A DE 10343950A DE 10343950 B4 DE10343950 B4 DE 10343950B4
Authority
DE
Germany
Prior art keywords
seat
valve
valve stem
fuel injection
housing
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.)
Expired - Fee Related
Application number
DE2003143950
Other languages
German (de)
Other versions
DE10343950A1 (en
Inventor
Dietmar Schmieder
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
Priority to DE2003143950 priority Critical patent/DE10343950B4/en
Publication of DE10343950A1 publication Critical patent/DE10343950A1/en
Application granted granted Critical
Publication of DE10343950B4 publication Critical patent/DE10343950B4/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168Assembling; Disassembling; Manufacturing; Adjusting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/21Fuel-injection apparatus with piezo-electric or magnetostrictive elements

Abstract

Fuel injection valve, in particular for the direct injection of fuel into a combustion chamber of an internal combustion engine, comprising a valve housing comprising an actuator housing for axial adjustment of a valve needle actuator housing and a valve seat having a valve seat, said Aktorgehause (1.1) a first seat (15) and the Valve stem (1.2) has a second seat surface (16), characterized in that the valve stem (1.2) between the second seat surface (16) and the actuator housing (1.1) with the valve stem (1.2) connecting the weld seam (26) under an axial tensile stress is and with the second seat (16) against the first seat (15) is printed.

Description

  • State of the art
  • The invention relates to a fuel injection valve according to the preamble of the main claim. In the not pre-published German patent application 103 10 787 is a fuel injector proposed with a valve housing consisting of an actuator for axial displacement of a valve needle having actuator housing and a valve seat having a valve stem. The envisaged at the Aktorgehause welds between a cylinder portion of the valve housing and a front cover with the valve stem are heavily loaded by the high fuel pressure within the Aktorgehauses train and must be executed fuel-tight. In addition, the material of Ventilgehauses is difficult to weld because of high carbon content. Therefore, the pressure resistance of the valve housing is too low.
  • From the DE 195 19 191 C2 An injection valve for fuel injection systems is already known, which has a valve housing arranged in a nozzle needle, which can open and close at least one injection port of the injection valve. In addition, the injection valve has a fuel inlet, which is hydraulically connected via a respective pressure chamber with two differently sized control surfaces of the nozzle needle and a plunger driving the nozzle needle. A piezoelectric drive means is provided which is hydraulically translated via a primary and secondary piston and which controls the nozzle needle which is directly controllable via the plunger by the secondary piston which is drivable by the primary piston of the piezo driver, wherein between the primary piston, the secondary piston and the housing is a working space is formed. Between the plunger and the housing and between the primary piston and the secondary piston and between the primary piston and the housing gaps are provided, which are designed so that a small amount of fuel through the fuel inlet, the pressure chamber, the plunger along in the working space and leaking from Working space is guided along the secondary piston via a relief hole to the return.
  • From the DE 197 44 235 A1 is already an injection nozzle, in particular fuel injection nozzle on a reciprocating internal combustion engine, known, which has a carrier body in which a hydraulically actuated switching valve is arranged, which is associated with a hydraulic travel translator with a working piston, which is acted upon by a transfer liquid. In addition, the injection nozzle has a Verdrängerteil which is connected to a piezoelectric body which is arranged in a resilient capsule, which is firmly clamped at one end to the support body and the other end forms the displacer part of the path translator.
  • From the DE 199 42 816 A1 An injection valve for internal combustion engines is already known which has a valve body in which a valve member is arranged displaceably. In an open position, the valve member for injecting fuel into a combustion chamber of the internal combustion engine releases an opening to the combustion chamber. The valve member can be brought by an actuator in the open position. A hydraulic transmission element is disposed between the actuator and the valve member. The hydraulic transmission element has a base body forming a peripheral wall and two membrane-like elements fixedly connected to the base body at the respective end faces. The main body forms with the two membrane-like elements a cavity which is filled with a hydraulic fluid. The one membrane-like element is assigned to the actuator and the other membrane-like element to the valve member. The cross-sectional area of the diaphragm-like element assigned to the actuator is greater than the cross-sectional area of the diaphragm-like element assigned to the valve member.
  • Advantages of the invention
  • The fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that in a simple manner an improvement is achieved in that the valve housing is pressure resistant formed by the valve stem between a second seat and a connecting the actuator housing with the valve stem weld below an axial tensile stress and is printed with the second seat against a first seat. In this way, a bearing seat which seals against the atmosphere is formed, which absorbs axial forces acting on the valve stem by the fuel pressure and thereby relieves the weld seam between the actuator housing and the valve stem. The valve housing can be acted upon in this way with higher fuel pressures.
  • The measures listed in the dependent claims advantageous refinements and improvements of the main claim fuel injector are possible.
  • According to an advantageous embodiment, the second seat is formed on a zylinderformigen shoulder of the valve stem, wherein the zylinderformige paragraph is advantageously disposed on an actuator housing facing the end of the valve stem.
  • It is particularly advantageous if the second seat is arched, spherical, conical or flat in the direction of the first seat surface, since in this way a bearing seat sealing against the atmosphere is formed. The sealing requirement on the weld can be omitted.
  • It is very advantageous that the valve stem can be plugged into an opening of the actuator housing from an interior of the actuator housing until it contacts the second seating surface on the first seating surface, since in this way a bearing seat is formed which receives axial forces acting on the valve stem.
  • It is also advantageous if the actuator housing has a pot-shaped Gehauseabschnitt and a housing cover, wherein the cup-shaped housing portion of the actuator housing has a pot bottom on which the opening is arranged. The compressive strength of the Aktorgehauses is increased in this way, since the pot bottom is provided integrally on the Aktorgehause and thereby eliminates a weld. The first seat is advantageously provided on the interior of the facing side of the pot bottom concentric with the opening.
  • It is also advantageous if the first seat is conical, spherical, disk-shaped or flat.
  • According to an advantageous embodiment, it is provided that the valve stem has a Außenpaßfläche and the opening has a Innenpaßflache, since the valve stem is radially guided by the fit, so that no radial forces can occur at the weld between the actuator housing and the valve stem.
  • It is particularly advantageous if the weld is arranged on the side facing away from the interior of the pot bottom, since in this way an axial tensile stress between the second seat and the weld can be produced.
  • drawing
  • An embodiment of the invention is shown in simplified form in the drawings and explained in more detail in the following description.
  • Description of the exemplary embodiment
  • The drawing shows an inventive fuel injection valve.
  • The fuel injection valve is used to inject fuel into a combustion chamber of an internal combustion engine and is used for example in the so-called direct injection.
  • The fuel injection valve has a valve housing 1 consisting of an actuator housing 1.1 and a valve stem 1.2 , The actuator housing 1.1 For example, is formed in two parts, consisting of a cup-shaped housing section 1.3 and a housing cover 1.4 , At the Aktorgehause 1.1 For example, on the housing cover 1.4 , is an input channel 2 for connection to a fuel line 5 intended. The fuel line 5 For example, it is connected to a so-called fuel distributor of the internal combustion engine. The pot-shaped Gehauseabschnitt 1.3 and the housing cover 1.4 close an interior 1.5 in which a schematically illustrated actuator 3 for the axial adjustment of a valve needle 4 is arranged. The actor 3 is, for example, a cooperating with an excitable coil armature, a hydraulic element, a piezoelectric actuator or the like. The actor 3 is executed, for example, encapsulated with respect to the fuel.
  • The valve needle 4 is in the valve housing 1 provided axially movable and has, for example, a the actuator 3 facing needle shaft 7 and one the actor 3 remote valve closing body 8th on. The actor 3 transfers its motion directly or indirectly to the needle shaft 7 the valve needle 4 , whereby the with a valve seat 9 cooperating valve closing bodies 8th the fuel injector opens or closes. The fuel injection valve has, for example, a so-called ball-cone seat, wherein the valve seat 9 for example, conical and the valve closing body 8th is formed in sections spherical. When the fuel injection valve is closed, the valve closing body is located 8th over its entire circumference at the valve seat 9 with line or surface contact tightly and forms a first sealing seat.
  • The valve closing body 8th For example, has a larger diameter than the needle shaft 7 , From the needle shaft 7 starting from the valve closing body expands 8th up to a downstream edge 12 with maximum diameter of the valve closing body 8th , Downstream of the trailing edge 12 has the valve closing body 8th for example, a diffuser section 13 on, in which the Ventilschließkorper 8th rejuvenated.
  • The valve seat 9 is on the valve stem 1.2 of the valve housing 1 provided and may be a separate part on the valve stem 1.2 or in one piece with the valve stem 1.2 be connected.
  • The actuator housing 1.1 points to a pot bottom 1.6 the cup-shaped housing portion 1.3 an opening 14 on. The bottom of the pot 1.6 is in one piece on the Aktorgehause 1.1 provided, so that over the prior art eliminates a weld. This increases the pressure resistance of the actuator housing 1.1 and reduces the manufacturing costs.
  • According to the invention is at one of the interior 1.5 facing the end of the opening 14 a first seat 15 provided concentric to the opening 14 is arranged and with a second seat 16 of the valve stem 1.2 interacts. The first seat 15 and the second seat 16 are designed such that the second seat in the installed state of the valve stem 1.2 with line contact or as small as possible surface contact on the first seat 15 is applied.
  • The first seat 15 is for example conical and the second seat 16 for example, spherical or in the direction of the first seat 15 gewölbt executed. The first seat 15 but can also scheibenformig or flat and the second seat 16 be formed spherical, for example. Conversely, the first seat can 15 also spherical and the second seat 16 be formed flat. Likewise, the first seat can 15 and the second seat 16 have a cone shape with different angles of inclination or both in the direction of each opposite seat surface 15 . 16 to be ingrained. Other combinations are of course possible.
  • The second seat 16 is on a cylindrical heel 19 of the valve stem 1.2 formed, for example, on a the actuator housing 1.1 facing the end of the valve stem 1.2 is arranged. The second seat 16 is for example by a spherical rounding 20 on the cylindrical heel 19 on the first seat 15 formed side facing.
  • The valve stem 1.2 is from the interior 1.5 of the Aktorgehauses 1.1 out through the opening 14 inserted, which is the valve seat 9 facing the end. The diameter of the cylindrical heel 19 is greater than the diameter of the opening 14 , so that the valve stem 1.2 with his second seat 16 on the first seat 15 of the Aktorgehauses 1.1 comes to the concern. The valve stem 1.2 passes through the second seat 16 starting the opening 14 and towers over the interior 1.5 opposite end of the opening 14 with a part of its axial length in one of the Aktorgehause 1.1 opposite direction.
  • According to the invention, the valve stem 1.2 For example, at a Paßflachenabsatz 23 , an outdoor fun area 21 on top, with an interior mating surface 22 the opening 14 interacts. The outdoor mating surface 21 of the valve stem 1.2 is in the area of the interior 1.5 opposite end of the opening 14 arranged.
  • At the the interior 1.5 opposite end of the opening 14 , on the interior 1.5 opposite side of the pot bottom 1.6 is a ring-shaped circumferential weld 26 provided the actuator housing 1.1 with the valve stem 1.2 combines. Due to the intended fit between the Aktorgehause 1.1 and the valve stem 1.2 is the valve stem 1.2 guided radially, so that no radial forces at the weld 26 may occur. By the inventive storage of the valve stem 1.2 , which is referred to in the execution as ball-and-cone seat as cardanic bearing, is the weld 26 only minimally loaded with axial forces, since those with the second seat surface 16 cooperating first seat 15 absorbs these axial forces.
  • According to the invention, the valve stem 1.2 before welding to the actuator housing 1.1 axially biased, ie during welding either pulls a tool on the valve stem 1.2 or the tool prints on the cylindrical shoulder 19 such that the second seat 16 against the first seat 15 is printed. Subsequently, the valve stem 1.2 standing welded under this axial bias, so that the second seat 16 always, so even after a relief of the valve stem 1.2 through the tool, towards the first seat 15 is pressed and forms a second sealing seat, which is the interior 1.5 of the actuator housing 1.1 tight against the atmosphere. The valve stem 1.2 is in this way between the second seat 16 and the weld 26 axially biased and is under a tensile stress. The weld 26 does not necessarily have to be fuel-tight in contrast to the prior art, since the second sealing seat fulfills the sealing function. The weld 26 is depressurized by the inventive storage pressure.
  • The valve stem 1.2 has a passageway 27 on top of the interior 1.5 of the Aktorgehauses 1.1 with the fuel injector open with a combustion chamber 33 the internal combustion engine connects. At the the combustion chamber 33 facing the end of the passageway 27 is the valve seat 9 arranged. The valve needle 4 passes through the passageway 27 from the valve seat 9 starting and overhangs the passageway 27 For example, up to the actuator 3 , Between the passageway 27 and the valve needle 4 is an annular gap 28 provided by the the interior 1.5 facing the end of the passageway 27 downstream to the valve seat 9 proceeds.
  • The valve stem 1.2 , the valve needle 4 and the passageway 27 For example, they are concentric with an axis 29 arranged the fuel injection valve.
  • The fuel is delivered via the input channel 2 and the interior 1.5 into the annular gap 28 in the passageway 27 passed, with the fuel over the gap 28 to the valve closing body 8th upstream of the first sealing seat of the valve seat 9 arrives. When opening the fuel injection valve lifts the valve closing body 8th from the first sealing seat, thereby connecting to the combustion chamber 33 the internal combustion engine is opened, so that fuel via a between the valve closing body 8th and the valve seat 9 formed annular output gap in the combustion chamber 33 ausstromt. The larger the stroke of the valve needle 4 in the opening direction, the larger the output gap and the more fuel is in the combustion chamber 33 injected. The fuel injection valve is for example a so-called outward-opening valve, wherein the valve needle 4 a stroke in the direction of the combustion chamber 33 ausfuhrt.

Claims (9)

  1. Fuel injection valve, in particular for the direct injection of fuel into a combustion chamber of an internal combustion engine, comprising a valve housing comprising an actuator housing having an actuator for the axial adjustment of a valve needle and a valve stem having a valve seat, wherein the actuator housing ( 1.1 ) a first seat ( 15 ) and the valve stem ( 1.2 ) a second seat ( 16 ), characterized in that the valve stem ( 1.2 ) between the second seat ( 16 ) and one the actuator housing ( 1.1 ) with the valve stem ( 1.2 ) connecting weld ( 26 ) is under an axial tension and with the second seat ( 16 ) against the first seat ( 15 ) is printed.
  2. Fuel injection valve according to claim 1, characterized in that the second seat surface ( 16 ) on a cylindrical shoulder ( 19 ) of the valve stem ( 1.2 ) is trained.
  3. Fuel injection valve according to claim 2, characterized in that the zylinderformige paragraph ( 19 ) on a the actuator housing ( 1.1 ) facing the end of the valve stem ( 1.2 ) is arranged.
  4. Fuel injection valve according to claim 1, characterized in that the second seat ( 16 ) in the direction of the first seat ( 15 ) is gewölbt, spherical, conical or flat.
  5. Fuel injection valve according to claim 1, characterized in that the valve stem ( 1.2 ) from an interior ( 1.5 ) of the actuator housing ( 1.1 ) to the concerns of the second seat ( 16 ) on the first seat ( 15 ) in an opening ( 14 ) of the actuator housing ( 1.1 ) is pluggable.
  6. Fuel injection valve according to claim 5, characterized in that the Aktorgehause ( 1.1 ) a cup-shaped housing section ( 1.3 ) and a housing cover ( 1.4 ), wherein the topfformige Gehauseabschnitt ( 1.3 ) of the Aktorgehauses ( 1.1 ) a pot bottom ( 1.6 ) at which the opening ( 14 ) is arranged, wherein the first seat ( 15 ) on the interior ( 1.5 ) facing side of the pot bottom ( 1.6 ) concentric with the opening ( 14 ) is provided.
  7. Fuel injection valve according to claim 5, characterized in that the first seat ( 15 ) is cone-shaped, spherical, disk-shaped or flat.
  8. Fuel injection valve according to claim 5, characterized in that the valve stem ( 1.2 ) an outdoor mating surface ( 21 ) and the opening ( 14 ) a Innenfaßflache ( 22 ) having.
  9. Fuel injection valve according to claim 6, characterized in that the weld seam ( 26 ) on the interior ( 1.5 ) facing away from the bottom of the pot ( 1.6 ) is arranged.
DE2003143950 2003-09-23 2003-09-23 Fuel injector Expired - Fee Related DE10343950B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2003143950 DE10343950B4 (en) 2003-09-23 2003-09-23 Fuel injector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2003143950 DE10343950B4 (en) 2003-09-23 2003-09-23 Fuel injector

Publications (2)

Publication Number Publication Date
DE10343950A1 DE10343950A1 (en) 2005-04-14
DE10343950B4 true DE10343950B4 (en) 2014-12-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE2003143950 Expired - Fee Related DE10343950B4 (en) 2003-09-23 2003-09-23 Fuel injector

Country Status (1)

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DE (1) DE10343950B4 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519191C2 (en) * 1995-05-24 1997-04-10 Siemens Ag Injector
DE19744235A1 (en) * 1997-10-07 1999-04-08 Fev Motorentech Gmbh & Co Kg Fuel injection nozzle for IC engine
DE19942816A1 (en) * 1999-09-08 2001-03-22 Daimler Chrysler Ag Injection valve has hydraulic conversion unit with hollow volume bounded by larger area membrane associated with control element and smaller area one associated with valve element
DE10310787A1 (en) * 2003-03-12 2004-09-23 Robert Bosch Gmbh Tubular spring for actuator of fuel injection valve for IC engine fuel injection system provided by 2 cooperating half shells

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519191C2 (en) * 1995-05-24 1997-04-10 Siemens Ag Injector
DE19744235A1 (en) * 1997-10-07 1999-04-08 Fev Motorentech Gmbh & Co Kg Fuel injection nozzle for IC engine
DE19942816A1 (en) * 1999-09-08 2001-03-22 Daimler Chrysler Ag Injection valve has hydraulic conversion unit with hollow volume bounded by larger area membrane associated with control element and smaller area one associated with valve element
DE10310787A1 (en) * 2003-03-12 2004-09-23 Robert Bosch Gmbh Tubular spring for actuator of fuel injection valve for IC engine fuel injection system provided by 2 cooperating half shells

Also Published As

Publication number Publication date
DE10343950A1 (en) 2005-04-14

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