EP2478208A1 - Injector - Google Patents

Injector

Info

Publication number
EP2478208A1
EP2478208A1 EP10742454A EP10742454A EP2478208A1 EP 2478208 A1 EP2478208 A1 EP 2478208A1 EP 10742454 A EP10742454 A EP 10742454A EP 10742454 A EP10742454 A EP 10742454A EP 2478208 A1 EP2478208 A1 EP 2478208A1
Authority
EP
European Patent Office
Prior art keywords
pin
angle compensation
injector according
compensation element
injector
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
EP10742454A
Other languages
German (de)
French (fr)
Other versions
EP2478208B1 (en
Inventor
Nadja Eisenmenger
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 EP2478208A1 publication Critical patent/EP2478208A1/en
Application granted granted Critical
Publication of EP2478208B1 publication Critical patent/EP2478208B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
    • F02M63/008—Hollow valve members, e.g. members internally guided

Definitions

  • the invention relates to an injector according to the preamble of claim 1.
  • Such an injector is known from DE 10 2006 021 741 A1.
  • a control valve is provided, which releases or closes a connection from a control chamber into a fuel return via a closing element.
  • the closing element is exemplified by a magnet armature in which a pin is slidably guided, which is supported with its opposite end of the control chamber to a housing cover.
  • the valve cover end facing is provided with a radius, so that the end of the pin points punctiformly on the housing cover.
  • the radius is chosen as large as possible. This is manufacturing technology only possible with a relatively high effort. Disclosure of the invention
  • the invention is based on the object of further developing an injector according to the preamble of claim 1 such that tilting moments on the armature or on the pin are avoided or reduced at the lowest possible production outlay high tightness and low wear of the valve seat over the lifetime of the injector to allow. This object is achieved in an injector with the features of claim 1.
  • the invention is the
  • the angle compensation element facing at least one pin is formed at least substantially flat on the end portion and that the angle compensation element on the end portion of the pin facing side has a concave receptacle.
  • the receptacle is formed at least in the region of the contact surface of a spherical segment. Due to the spherical segment-like design of the receptacle, a relatively large contact surface can be achieved so that the surface pressure between the pin and the angle compensation element is kept within limits. This benefits the life of the injector or wear. Alternatively, however, it is also conceivable that the receptacle is frustoconical at least in the region of the contact surface. Such a design can be produced more cost-effectively compared to the spherical segment-shaped formation of the recording.
  • the end of the pin has a rounded contact edge in the region of the contact surface.
  • the radius of the contact edge is less than the corresponding radius in the region of the contact surface.
  • the invention can be used particularly preferably in an injector in which the angle between the longitudinal axis of the pin and the longitudinal axis of the angle compensation element is less than 5 °. With such a design, the wear over the life of the injector is limited. In particular, any tilting moments which may occur are compensated by the angle compensation element.
  • the angle compensation element is formed, for example, from a harder material than a valve cover, which further reduces wear.
  • the production of the valve cover is simplified.
  • the contact surfaces can be realized in the receptacle and the pin, if they are formed by grinding. Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.
  • FIG. 1 shows a longitudinal section through a portion of an injector according to the invention
  • FIG. 2 shows an enlarged detail of the injector according to FIG. 1 in the region of an angle compensation element in a sectional representation
  • FIG. 3 shows a detail of FIG. 2 on an enlarged scale
  • FIG. 5 shows an enlarged detail of the injector according to FIG. 1 in the region of an angle compensation element with a comparison with FIG. 2 modified angle compensation element in longitudinal section and
  • FIG. 6 shows an enlarged detail of the modified angle compensation element according to FIG. 5.
  • a part of an injector 1 which serves for injecting fuel into a combustion chamber of an internal combustion engine, in particular in a diesel engine.
  • Such an injector 1 is well known from so-called common rail systems.
  • the injector 1 has an injector body 10, in which a control valve 1 1 is arranged.
  • a control piston 12 is slidably guided, which releases when injecting and lowering not shown injection openings in the injector body 10 and thus injects the fuel into the combustion chamber of the internal combustion engine.
  • the control valve 1 1 is axially fixed in a recess of the injector body 10 with the interposition of a disc 14 by means of a valve clamping screw 15.
  • the injector body 10 has an annular space 13, which is connected via one or more inlet throttles 16 to a control chamber 17 formed above the control piston 12 within the control valve 11.
  • the control chamber 17 is connected via an outlet throttle 18 with a valve chamber 20.
  • the valve chamber 20 designed as a closing element armature 22 is arranged axially displaceable, which serves for controlling the fuel flow from the control chamber 17 into the valve chamber 20.
  • the armature 22 forms with the bottom 24 of its extension 25 on a surface of the control valve 1 1 a flat seat 26, so when lifting the armature
  • the extension 25 of the armature 22 is in a sleeve-like extension 28 of the
  • a pin 30 is axially movably guided in a through hole 29, the lower, the outlet throttle 18 side facing the outlet throttle 18 covers.
  • the diameter d of the pin 30 substantially corresponds to the diameter of the seat 31 formed by the underside 24 of the armature 22.
  • the upper region of the pin 30 is surrounded outside the armature 22 by a spring element 33.
  • the spring element 33 is supported between the upper side of the armature 22 and a housing cover 34 of the injector 1 designed as a support element.
  • the spring element 33 is surrounded by a sleeve 35, which is arranged in an inner bore of a magnetic core 36. If the magnetic coil 37 is not energized, the armature 22 is pressed against the seat 31 due to the spring force of the spring element 33 and in this case closes the outlet throttle 18.
  • the Anchor 22 lifts the armature 22 away from the seat 31, so that a net return flow from the control chamber 17 into the return bore 23 occurs.
  • Essential to the invention is the arrangement or mounting of the pin 30 on its side facing away from the control chamber 17 in the region of the housing cover 34th
  • the upper end 38 of the pin 30 is slightly reduced in diameter and arranged within an angle compensation element 40.
  • the angle compensation element 40 has a cylindrically shaped body which has a receptacle 42 on its side facing the pin 30.
  • the receptacle 42 in this case has a cylindrically shaped first region 43 which merges into a second region 44 formed in the manner of a spherical segment.
  • the end 38 of the pin 30 bears against an annular contact surface 45. Since the pin 30 with its outlet throttle 18 facing bottom is always under the high pressure of the fuel, in this case a pointing in the direction of the angle compensation element 40 axial force is generated.
  • the angle compensation element 40 rests with its flat upper side 47 against the facing surface of the housing cover 34. How to look in particular from the
  • the circumferential edge 48 of the end 38 of the pin 30 has a radius r, which is smaller than the radius R, which is formed in the second region 44 of the angle compensation element 40.
  • both the radius r of the edge 48 and the radius R of the receptacle 42 are made by grinding.
  • FIG. 4 shows a modified embodiment in which the edge 48a of the end 38a has a radius r 'which is only slightly smaller than The radius R of the receptacle 42.
  • This has the advantage that when transmitting the axial force, the edge 48a over a large area to the radius R of the receptacle 42 hugs, so that the contact surface 45a increases and thus the surface pressure between the end 38a and the Shot 42 is reduced.
  • FIGS. 5 and 6 show a modified angle compensation element 50, which has been modified relative to the angle compensation element 40 in the region of the second region 51 in such a way that the second region 51 has a conical shape.
  • a rectilinear receiving surface 52 is formed in the angle compensation element 50. This results in a bearing surface 53 which is slightly reduced in relation to the angle compensation element 40.
  • the injector 1 described so far can be modified or modified in a variety of ways. So it is also conceivable, for example, instead of a one-piece pin 30 to use a plurality of longitudinally successively arranged anchor pins. Essential to the invention is only the storage of the pin in the region of the valve cover or the pin, which is arranged on the opposite side of the control chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention relates to an injector (1) for injecting fuel into a combustion chamber of an internal combustion engine, in which an injection member which opens or closes at least one injection opening is actuated by a control valve (11), the control valve (11) opening or closing a connection from the control chamber (17) to a fuel return (23) by the closing element (22) being set onto a seat (31) or opening the latter, there being formed in the closing element (22) a bore (29) in which at least one pin (30) is accommodated such that it can move axially, the diameter of the bore (29) substantially corresponding to the diameter of the pin (30), and the at least one pin (30) being supported indirectly on a supporting element (34) by the end section (38; 38a) of said pin (30) facing away from the closing element (22). The invention provides for an angle compensating element (40; 50) to be arranged between the end section (38; 38a) of the at least one pin (30) and the supporting element (34) and for an annular contact surface (45; 45a) to be formed between the angle compensating element (40; 50) and the end section (38; 38a) of the at least one pin (30).

Description

Beschreibung  description
Injektor injector
Stand der Technik State of the art
Die Erfindung betrifft einen Injektor nach dem Oberbegriff des Anspruchs 1. The invention relates to an injector according to the preamble of claim 1.
Ein derartiger Injektor ist aus der DE 10 2006 021 741 A1 bekannt. Bei dem bekannten Injektor ist ein Steuerventil vorgesehen, welches über ein Schließelement eine Verbindung aus einem Steuerraum in einen Kraftstoffrücklauf freigibt oder verschließt. Hierbei ist das Schließelement beispielhaft von einem Magnetanker gebildet, in dem ein Stift gleitend geführt ist, der sich mit seinem dem Steuerraum gegenüberliegenden Ende an einem Gehäusedeckel abstützt. Such an injector is known from DE 10 2006 021 741 A1. In the known injector, a control valve is provided, which releases or closes a connection from a control chamber into a fuel return via a closing element. Here, the closing element is exemplified by a magnet armature in which a pin is slidably guided, which is supported with its opposite end of the control chamber to a housing cover.
Für die Funktion des Schließelementes ist es hierbei wesentlich, dass dieses sehr exakt geführt wird, um eine dichte Verbindung an einem Dichtsitz über die gesamte Lebensdauer des Injektors ausbilden zu können. Um zu vermeiden, dass Kippkräfte auf den Anker ausgeübt werden, welche zu einem undichten Ventilsitz sowie zu einem erhöhten Verschleiß des Dichtsitzes führen würden, ist es bei dem bekannten Injektor vorgesehen, dass das dem Ventildeckel zugewandte Ende mit einem Radius versehen ist, sodass das Ende des Stiftes punktförmig an dem Gehäusedeckel anliegt. Um die Flächenpressung zwischen dem Stift und dem Gehäusedeckel möglichst gering zu halten, wird der Radius hierbei möglichst groß gewählt. Dies ist fertigungstechnisch nur mit einem relativ hohen Aufwand möglich. Offenbarung der Erfindung For the function of the closing element, it is essential that this is performed very precisely in order to form a tight connection to a sealing seat over the entire life of the injector can. In order to avoid that tilting forces are exerted on the armature, which would lead to a leaking valve seat and increased wear of the sealing seat, it is provided in the known injector that the valve cover end facing is provided with a radius, so that the end of the pin points punctiformly on the housing cover. In order to keep the surface pressure between the pin and the housing cover as low as possible, the radius is chosen as large as possible. This is manufacturing technology only possible with a relatively high effort. Disclosure of the invention
Ausgehend von dem dargestellten Stand der Technik liegt der Erfindung die Auf- gäbe zugrunde, einen Injektor nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, dass bei möglichst geringem fertigungstechnischen Aufwand Kippmomente auf den Anker bzw. auf den Stift vermieden bzw. reduziert werden, um eine hohe Dichtheit und einen geringen Verschleiß des Ventilsitzes über die gesamte Lebensdauer des Injektors zu ermöglichen. Diese Aufgabe wird bei einem Injektor mit den Merkmalen des Anspruchs 1 gelöst. Der Erfindung liegt dabei dieOn the basis of the illustrated prior art, the invention is based on the object of further developing an injector according to the preamble of claim 1 such that tilting moments on the armature or on the pin are avoided or reduced at the lowest possible production outlay high tightness and low wear of the valve seat over the lifetime of the injector to allow. This object is achieved in an injector with the features of claim 1. The invention is the
Idee zugrunde, über ein Winkelausgleichselement den Stift auf der dem Gehäusedeckel zugewandten Seite zu lagern, wobei das Winkelausgleichselement eine ringförmig ausgebildete Anlagefläche aufweist. Hierdurch wird die Flächenpressung zwischen dem Stift und der Anlagefläche relativ gering gehalten, und gleichzeitig werden Kippmomente ausgeglichen bzw. eliminiert. Idea to store the pin on the side facing the housing cover via an angle compensation element, wherein the angle compensation element has an annular contact surface formed. As a result, the surface pressure between the pin and the contact surface is kept relatively low, and at the same tilting moments are compensated or eliminated.
Vorteilhafte Weiterbildungen des erfindungsgemäßen Injektors sind in den Unteransprüchen angegeben. Bevorzugt ist vorgesehen, dass der dem Winkelausgleichselement zugewandte wenigstens eine Stift an dem Endabschnitt zumindest im Wesentlichen eben ausgebildet ist und, dass das Winkelausgleichselement auf der dem Endabschnitt des Stiftes zugewandten Seite eine konkav ausgebildete Aufnahme aufweist. Durch diese Ausbildung wird ein relativ geringer fertigungstechnischer Aufwand an dem Stift benötigt sowie die gewünschte ringförmig ausgebildete Anlagefläche ausgebildet. Advantageous developments of the injector according to the invention are specified in the subclaims. It is preferably provided that the angle compensation element facing at least one pin is formed at least substantially flat on the end portion and that the angle compensation element on the end portion of the pin facing side has a concave receptacle. By this training, a relatively low manufacturing effort on the pin is required and formed the desired annular contact surface.
Besonders bevorzugt ist es hierbei, dass die Aufnahme zumindest im Bereich der Anlagefläche kugelabschnittsförmig ausgebildet ist. Durch die kugelabschnittsar- tige Ausbildung der Aufnahme lässt sich eine relativ große Anlagefläche erzielen, sodass sich die Flächenpressung zwischen dem Stift und dem Winkelausgleichselement in Grenzen hält. Dies kommt der Lebensdauer des Injektors bzw. dem Verschleiß zugute. Alternativ hierzu ist es jedoch auch denkbar, dass die Aufnahme zumindest im Bereich der Anlagefläche kegelstumpfförmig ausgebildet ist. Eine derartige Ausbildung lässt sich im Vergleich zur kugelabschnittsförmigen Ausbildung der Aufnahme kostengünstiger herstellen. It is particularly preferred in this case that the receptacle is formed at least in the region of the contact surface of a spherical segment. Due to the spherical segment-like design of the receptacle, a relatively large contact surface can be achieved so that the surface pressure between the pin and the angle compensation element is kept within limits. This benefits the life of the injector or wear. Alternatively, however, it is also conceivable that the receptacle is frustoconical at least in the region of the contact surface. Such a design can be produced more cost-effectively compared to the spherical segment-shaped formation of the recording.
Um die Flächenpressung zwischen dem Stift und der Aufnahme im Bereich der Anlagefläche weiter zu reduzieren, ist es in einer besonders bevorzugten Ausführungsform der Erfindung vorgesehen, dass das Ende des Stiftes im Bereich der Anlagefläche eine gerundet ausgebildete Anlagekante aufweist. In order to further reduce the surface pressure between the pin and the receptacle in the area of the contact surface, it is provided in a particularly preferred embodiment of the invention that the end of the pin has a rounded contact edge in the region of the contact surface.
Besonders bevorzugt ist es hierbei, dass der Radius der Anlagekante geringer ist als der korrespondierende Radius im Bereich der Anlagefläche. Durch diese Ausbildung wird bewirkt, dass bei einer von dem Stift ausgeübten Druckkraft sich die beiden Kontaktflächen des Stiftes und der Aufnahme aneinanderschmiegen, sodass eine besonders große Anlagefläche erzielt wird. Dadurch lässt sich die Flächenpressung zwischen dem Stift und der Aufnahme minimieren. It is particularly preferred in this case that the radius of the contact edge is less than the corresponding radius in the region of the contact surface. As a result of this design, the pressure force exerted by the pin causes the two contact surfaces of the pin and the receptacle to nestle together, so that a particularly large contact surface is achieved. This minimizes the surface pressure between the pin and the receptacle.
Die Erfindung lässt sich besonders bevorzugt bei einem Injektor einsetzen, bei dem der Winkel zwischen der Längsachse des Stiftes und der Längsachse des Winkelausgleichselementes geringer als 5° ist. Bei einer derartigen Ausbildung hält sich der Verschleiß über der Lebensdauer des Injektors in Grenzen. Insbesondere werden durch das Winkelausgleichselement eventuell auftretende Kippmomente ausgeglichen. The invention can be used particularly preferably in an injector in which the angle between the longitudinal axis of the pin and the longitudinal axis of the angle compensation element is less than 5 °. With such a design, the wear over the life of the injector is limited. In particular, any tilting moments which may occur are compensated by the angle compensation element.
Um den Fertigungsaufwand des Injektors weiter zu reduzieren, ist es besonders vorteilhaft, das Winkelausgleichselement als separates Bauteil auszubilden. Dadurch kann das Winkelausgleichselement zum Beispiel aus einem härteren Material als ein Ventildeckel ausgebildet werden, was den Verschleiß weiter reduziert. Darüber hinaus wird die Fertigung des Ventildeckels vereinfacht. In order to reduce the production cost of the injector on, it is particularly advantageous to form the angle compensation element as a separate component. As a result, the angle compensation element can be formed, for example, from a harder material than a valve cover, which further reduces wear. In addition, the production of the valve cover is simplified.
Relativ kostengünstig lassen sich die Anlageflächen in der Aufnahme und dem Stift realisieren, wenn diese durch Schleifen ausgebildet sind. Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnungen. Relatively inexpensive, the contact surfaces can be realized in the receptacle and the pin, if they are formed by grinding. Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.
Diese zeigen in: These show in:
Fig. 1 einen Längsschnitt durch einen Teilbereich eines erfindungsgemäßen Injektors, 1 shows a longitudinal section through a portion of an injector according to the invention,
Fig. 2 einen vergrößerten Ausschnitt aus dem Injektor gemäß der Fig. 1 im Bereich eines Winkelausgleichselements in einer Schnittdarstellung, 2 shows an enlarged detail of the injector according to FIG. 1 in the region of an angle compensation element in a sectional representation, FIG.
Fig. 3 ein Detail aus der Fig. 2 im vergrößerten Maßstab, 3 shows a detail of FIG. 2 on an enlarged scale,
Fig. 4 ein gegenüber der Fig. 3 abgewandeltes Ausführungsbeispiel, 4 is a comparison with FIG. 3 modified embodiment,
Fig. 5 einen vergrößerten Ausschnitt aus dem Injektor gemäß der Fig. 1 im Bereich eines Winkelausgleichselements mit einem gegenüber der Fig. 2 abgewandelten Winkelausgleichselement im Längsschnitt und 5 shows an enlarged detail of the injector according to FIG. 1 in the region of an angle compensation element with a comparison with FIG. 2 modified angle compensation element in longitudinal section and
Fig. 6 ein vergrößertes Detail des modifizierten Winkelausgleichselements gemäß der Fig. 5. 6 shows an enlarged detail of the modified angle compensation element according to FIG. 5.
In der Fig. 1 ist ein Teil eines Injektors 1 dargestellt, der zum Einspritzen von Kraftstoff in einen Brennraum einer Verbrennungskraftmaschine, insbesondere bei einem Dieselmotor, dient. Ein derartiger Injektor 1 ist aus sogenannten Common-Rail-Systemen allgemein bekannt. Der Injektor 1 weist einen Injektorkörper 10 auf, in dem ein Steuerventil 1 1 angeordnet ist. Im Steuerventil 1 1 ist ein Steuerkolben 12 gleitend geführt, welcher beim Heben und Senken nicht dargestellte Einspritzöffnungen im Injektorkörper 10 freigibt und somit den Kraftstoff in den Brennraum der Verbrennungskraftmaschine einspritzt. In Fig. 1, a part of an injector 1 is shown, which serves for injecting fuel into a combustion chamber of an internal combustion engine, in particular in a diesel engine. Such an injector 1 is well known from so-called common rail systems. The injector 1 has an injector body 10, in which a control valve 1 1 is arranged. In the control valve 1 1, a control piston 12 is slidably guided, which releases when injecting and lowering not shown injection openings in the injector body 10 and thus injects the fuel into the combustion chamber of the internal combustion engine.
Bezüglich der grundsätzlichen Funktionsweise eines derartigen Injektors 1 wird im Übrigen auf die Offenbarung der DE 10 2006 021 741 A1 der Anmelderin verwiesen. Das Steuerventil 1 1 ist in einer Ausnehmung des Injektorkörpers 10 unter Zwischenlage einer Scheibe 14 mittels einer Ventilspannschraube 15 axial fixiert. Im unteren Bereich des dargestellten Injektors 1 weist der Injektorkörper 10 einen Ringraum 13 auf, der über eine oder mehrere Zulaufdrosseln 16 mit einem oberhalb des Steuerkolbens 12 innerhalb des Steuerventils 1 1 ausgebildeten Steuerraum 17 verbunden ist. Der Steuerraum 17 ist über eine Ablaufdrossel 18 mit einem Ventilraum 20 verbunden. Im Ventilraum 20 ist ein als Schließelement ausgebildeter Anker 22 axial verschieblich angeordnet, der zur Steuerung des Kraft- stoffflusses aus dem Steuerraum 17 in den Ventilraum 20 dient. Der VentilraumWith regard to the basic mode of operation of such an injector 1, reference is moreover made to the disclosure of DE 10 2006 021 741 A1 of the Applicant. The control valve 1 1 is axially fixed in a recess of the injector body 10 with the interposition of a disc 14 by means of a valve clamping screw 15. In the lower region of the illustrated injector 1, the injector body 10 has an annular space 13, which is connected via one or more inlet throttles 16 to a control chamber 17 formed above the control piston 12 within the control valve 11. The control chamber 17 is connected via an outlet throttle 18 with a valve chamber 20. In the valve chamber 20 designed as a closing element armature 22 is arranged axially displaceable, which serves for controlling the fuel flow from the control chamber 17 into the valve chamber 20. The valve room
20 ist über eine Rücklaufbohrung 23 mit einem Niederdruckbereich des Com- mon-Rail-Systems gekoppelt. 20 is coupled via a return bore 23 with a low pressure region of the common rail system.
Der Anker 22 bildet mit der Unterseite 24 seines Fortsatzes 25 an einer Fläche des Steuerventils 1 1 einen Flachsitz 26 aus, sodass beim Abheben des AnkersThe armature 22 forms with the bottom 24 of its extension 25 on a surface of the control valve 1 1 a flat seat 26, so when lifting the armature
22 von dem Flachsitz 26 ein Abströmen von unter Hochdruck stehendem Kraftstoff aus dem Steuerraum 17 in den Ventilraum 20, und von dort in die Rücklaufbohrung 23 erfolgen kann. Der Fortsatz 25 des Ankers 22 ist in einer hülsenartigen Verlängerung 28 des22 of the flat seat 26 can flow out of high-pressure fuel from the control chamber 17 into the valve chamber 20, and from there into the return bore 23 can take place. The extension 25 of the armature 22 is in a sleeve-like extension 28 of the
Steuerventils 1 1 geführt. In der Längsachse des Ankers 22 ist in einer Durchgangsbohrung 29 ein Stift 30 axial beweglich geführt, dessen untere, der Ablaufdrossel 18 zugewandte Seite die Ablaufdrossel 18 überdeckt. Hierbei entspricht der Durchmesser d des Stiftes 30 im Wesentlichen dem Durchmesser des von der Unterseite 24 des Ankers 22 ausgebildeten Sitzes 31. Control valve 1 1 out. In the longitudinal axis of the armature 22, a pin 30 is axially movably guided in a through hole 29, the lower, the outlet throttle 18 side facing the outlet throttle 18 covers. In this case, the diameter d of the pin 30 substantially corresponds to the diameter of the seat 31 formed by the underside 24 of the armature 22.
Der obere Bereich des Stiftes 30 ist außerhalb des Ankers 22 von einem Federelement 33 umgeben. Das Federelement 33 stützt sich zwischen der Oberseite des Ankers 22 und einem als Stützelement ausgebildeten Gehäusedeckel 34 des Injektors 1 ab. Das Federelement 33 ist von einer Hülse 35 umgeben, welche in einer Innenbohrung eines Magnetkerns 36 angeordnet ist. Der Magnetkern 36 dient zusammen mit einer in dem Magnetkern 36 angeordneten Magnetspule 37 der Ansteuerung des Ankers 22. Ist die Magnetspule 37 nicht bestromt, so wird der Anker 22 aufgrund der Federkraft des Federelements 33 gegen den Sitz 31 gedrückt und verschließt hierbei die Ablaufdrossel 18. Bei einer Bestromung des Ankers 22 hebt hingegen der Anker 22 von dem Sitz 31 ab, sodass sich ein Net- torückfluss aus dem Steuerraum 17 in die Rücklaufbohrung 23 einstellt. The upper region of the pin 30 is surrounded outside the armature 22 by a spring element 33. The spring element 33 is supported between the upper side of the armature 22 and a housing cover 34 of the injector 1 designed as a support element. The spring element 33 is surrounded by a sleeve 35, which is arranged in an inner bore of a magnetic core 36. If the magnetic coil 37 is not energized, the armature 22 is pressed against the seat 31 due to the spring force of the spring element 33 and in this case closes the outlet throttle 18. When energizing the Anchor 22, on the other hand, lifts the armature 22 away from the seat 31, so that a net return flow from the control chamber 17 into the return bore 23 occurs.
Erfindungswesentlich ist die Anordnung bzw. Lagerung des Stiftes 30 an seiner dem Steuerraum 17 abgewandten Seite im Bereich des Gehäusedeckels 34.Essential to the invention is the arrangement or mounting of the pin 30 on its side facing away from the control chamber 17 in the region of the housing cover 34th
Hierbei ist, wie insbesondere aus einer Zusammenschau der Fig. 1 bis 3 erkennbar ist, das obere Ende 38 des Stiftes 30 im Durchmesser etwas reduziert und innerhalb eines Winkelausgleichselements 40 angeordnet. Das Winkelausgleichselement 40 besitzt einen zylindrisch ausgebildeten Körper, der auf seiner dem Stift 30 zugewandten Seite eine Aufnahme 42 aufweist. Wie insbesondere aus der Fig. 2 erkennbar ist, weist die Aufnahme 42 hierbei einen zylindrisch ausgebildeten ersten Bereich 43 auf, der in einen kugelabschnittsförmig ausgebildeten zweiten Bereich 44 übergeht. Innerhalb des zweiten Bereichs 44 liegt das Ende 38 des Stiftes 30 mit einer ringförmig ausgebildeten Anlagefläche 45 an. Da der Stift 30 mit seiner der Ablaufdrossel 18 zugewandten Unterseite stets unter dem hohen Druck des Kraftstoffs steht, wird hierbei eine in Richtung des Winkelausgleichselements 40 weisende Axialkraft erzeugt. Here, as can be seen in particular from a combination of FIGS. 1 to 3, the upper end 38 of the pin 30 is slightly reduced in diameter and arranged within an angle compensation element 40. The angle compensation element 40 has a cylindrically shaped body which has a receptacle 42 on its side facing the pin 30. As can be seen in particular from FIG. 2, the receptacle 42 in this case has a cylindrically shaped first region 43 which merges into a second region 44 formed in the manner of a spherical segment. Within the second region 44, the end 38 of the pin 30 bears against an annular contact surface 45. Since the pin 30 with its outlet throttle 18 facing bottom is always under the high pressure of the fuel, in this case a pointing in the direction of the angle compensation element 40 axial force is generated.
Das Winkelausgleichselement 40 liegt mit seiner ebenen Oberseite 47 an der zugewandten Fläche des Gehäusedeckels 34 an. Wie man insbesondere aus derThe angle compensation element 40 rests with its flat upper side 47 against the facing surface of the housing cover 34. How to look in particular from the
Fig. 3 erkennt, weist die umlaufende Kante 48 des Endes 38 des Stiftes 30 einen Radius r auf, welcher kleiner ist als der Radius R, welcher in dem zweiten Bereich 44 des Winkelausgleichselements 40 ausgebildet ist. Vorzugsweise wird sowohl der Radius r der Kante 48 als auch der Radius R der Aufnahme 42 durch Schleifen hergestellt. 3, the circumferential edge 48 of the end 38 of the pin 30 has a radius r, which is smaller than the radius R, which is formed in the second region 44 of the angle compensation element 40. Preferably, both the radius r of the edge 48 and the radius R of the receptacle 42 are made by grinding.
Durch die soweit beschriebene Ausbildung werden von dem Stift 30 in Richtung des Gehäusedeckels 34 gerichtete Axialkräfte über die Anlagefläche 45 des Winkelausgleichselements 40 aufgenommen. Hierbei können Kippmomente, welche durch eine (geringfügige) Schrägstellung im Bereich bis zu etwa 5 Grad der Längsachse des Stiftes 30 zur Längsachse des Winkelausgleichselements 40 auftreten, ausgeglichen werden. As a result of the training described so far, axial forces directed by the pin 30 in the direction of the housing cover 34 are received via the abutment surface 45 of the angle compensation element 40. In this case, tilting moments, which occur by a (slight) inclination in the range up to about 5 degrees of the longitudinal axis of the pin 30 to the longitudinal axis of the angle compensation element 40, can be compensated.
In der Fig. 4 ist eine modifizierte Ausführung dargestellt, bei der die Kante 48a des Endes 38a einen Radius r' aufweist, welcher nur geringfügig kleiner ist als der Radius R der Aufnahme 42. Dies hat den Vorteil, dass bei einer Übertragung der Axialkraft sich die Kante 48a über einen großen Bereich an den Radius R der Aufnahme 42 anschmiegt, sodass die Anlagefläche 45a vergrößert und somit die Flächenpressung zwischen dem Ende 38a und der Aufnahme 42 verringert wird. FIG. 4 shows a modified embodiment in which the edge 48a of the end 38a has a radius r 'which is only slightly smaller than The radius R of the receptacle 42. This has the advantage that when transmitting the axial force, the edge 48a over a large area to the radius R of the receptacle 42 hugs, so that the contact surface 45a increases and thus the surface pressure between the end 38a and the Shot 42 is reduced.
In den Fig. 5 und 6 ist ein modifiziertes Winkelausgleichselement 50 dargestellt, welches gegenüber dem Winkelausgleichselement 40 im Bereich des zweiten Bereichs 51 derart modifiziert wurde, dass der zweite Bereich 51 kegelförmig ausgebildet ist. Somit wird, wie insbesondere aus der Fig. 6 erkennbar ist, eine geradlinige Aufnahmefläche 52 in dem Winkelausgleichselement 50 ausgebildet. Daraus resultiert eine gegenüber dem Winkelausgleichselement 40 etwas verringerte Anlagefläche 53. FIGS. 5 and 6 show a modified angle compensation element 50, which has been modified relative to the angle compensation element 40 in the region of the second region 51 in such a way that the second region 51 has a conical shape. Thus, as can be seen in particular from FIG. 6, a rectilinear receiving surface 52 is formed in the angle compensation element 50. This results in a bearing surface 53 which is slightly reduced in relation to the angle compensation element 40.
Der soweit beschriebene Injektor 1 lässt sich in vielfältiger Art und Weise modifizieren bzw. abwandeln. So ist es beispielsweise auch denkbar, anstelle eines einteiligen Stiftes 30 mehrere, in Längsrichtung hintereinander angeordnete Ankerstifte zu verwenden. Erfindungswesentlich ist lediglich die Lagerung des Stiftes im Bereich des Ventildeckels bzw. des Stiftes, welcher auf der dem Steuerraum gegenüberliegenden Seite angeordnet ist. The injector 1 described so far can be modified or modified in a variety of ways. So it is also conceivable, for example, instead of a one-piece pin 30 to use a plurality of longitudinally successively arranged anchor pins. Essential to the invention is only the storage of the pin in the region of the valve cover or the pin, which is arranged on the opposite side of the control chamber.

Claims

Ansprüche claims
1 . Injektor (1 ) zum Einspritzen von Kraftstoff in einen Brennraum einer Verbrennungskraftmaschine mit einem Steuerventil (1 1 ), das eine Verbindung aus einem Steuerraum (17) in einen Kraftstoffrücklauf (23) freigibt oder verschließt, indem ein Schließelement (22) in einen Sitz (31 ) gestellt wird oder diesen freigibt, wobei in dem Schließelement (22) eine Bohrung (29) ausgebildet ist, in der ein Stift (30) axial beweglich aufgenommen ist und der Durchmesser der Bohrung (29) im Wesentlichen dem Durchmesser des Stiftes (30) entspricht, und wobei sich der Stift (30) mit seinem dem Schließelement (22) abgewandten Endabschnitt (38; 38a) zumindest mittelbar an einem Stützelement (34) abstützt, dadurch gekennzeichnet, dass zwischen dem Endabschnitt (38; 38a) des Stiftes (30) und dem Stützelement (34) ein Winkelausgleichselement (40; 50) angeordnet ist und dass zwischen dem Winkelausgleichselement (40; 50) und dem Endabschnitt (38; 38a) des Stiftes (30) eine ringförmige Anlagefläche (45; 45a) ausgebildet ist. 1 . Injector (1) for injecting fuel into a combustion chamber of an internal combustion engine with a control valve (1 1) which releases or closes a connection from a control chamber (17) into a fuel return (23) by inserting a closing element (22) into a seat ( 31) is provided or releases, wherein in the closing element (22) has a bore (29) is formed in which a pin (30) is received axially movable and the diameter of the bore (29) substantially the diameter of the pin (30 ), and wherein the pin (30) is at least indirectly supported on a support element (34) with its end section (38; 38a) facing away from the closing element (22), characterized in that between the end section (38; 38a) of the pin (38; 30) and the support element (34) an angle compensation element (40; 50) is arranged and that between the angle compensation element (40; 50) and the end portion (38; 38a) of the pin (30) has an annular abutment surface (40). 45, 45a) is formed.
2. Injektor nach Anspruch 1 , 2. Injector according to claim 1,
dadurch gekennzeichnet,  characterized,
dass der dem Winkelausgleichselement (40; 50) zugewandte Stift (30) an dem Endabschnitt (38; 38a) zumindest im Wesentlichen eben ausgebildet ist und dass das Winkelausgleichselement (40; 50) auf der dem Endabschnitt (38; 38a) des Stiftes (30) zugewandten Seite eine konkav ausgebildete Aufnahme (42) aufweist.  the pin (30) facing the angle compensation element (40; 50) is at least essentially planar at the end section (38; 38a) and the angle compensation element (40; 50) is formed on the end section (38; 38a) of the pin (30 ) facing side has a concave receptacle (42).
Injektor nach Anspruch 2, Injector according to claim 2,
dadurch gekennzeichnet, dass die Aufnahme (42) zumindest im Bereich der Anlagefläche (45) kugel- abschnittsförmig ausgebildet ist. characterized, in that the receptacle (42) is formed in the manner of a spherical section, at least in the area of the contact surface (45).
Injektor nach Anspruch 2, Injector according to claim 2,
dadurch gekennzeichnet,  characterized,
dass die Aufnahme zumindest im Bereich der Anlagefläche (45a) kegel- stumpfförmig ausgebildet ist.  the receptacle is of frusto-conical form at least in the area of the contact surface (45a).
Injektor nach Anspruch 3 oder 4, Injector according to claim 3 or 4,
dadurch gekennzeichnet,  characterized,
dass das Ende des Stiftes (30) im Bereich der Anlagefläche (45; 45a) eine gerundet ausgebildete Anlagekante (48; 48a) aufweist.  that the end of the pin (30) in the region of the contact surface (45; 45a) has a rounded abutment edge (48; 48a).
Injektor nach Anspruch 5, Injector according to claim 5,
dadurch gekennzeichnet,  characterized,
dass der Radius (r; r') der Anlagekante (48; 48a) geringer ist als der korrespondierende Radius (R) im Bereich der Anlagefläche (45; 45a). the radius (r; r ' ) of the contact edge (48; 48a) is smaller than the corresponding radius (R) in the region of the contact surface (45; 45a).
Injektor nach einem der Ansprüche 1 bis 6, Injector according to one of claims 1 to 6,
dadurch gekennzeichnet,  characterized,
dass der Winkel zwischen der Längsachse des Stiftes (30) und der Längsachse des Winkelausgleichselements (40; 50) weniger als 5 Grad beträgt.  the angle between the longitudinal axis of the pin (30) and the longitudinal axis of the angle compensation element (40; 50) is less than 5 degrees.
Injektor nach einem der Ansprüche 1 bis 7, Injector according to one of claims 1 to 7,
dadurch gekennzeichnet,  characterized,
dass das Winkelausgleichselement (40; 50) als separates Bauteil ausgebildet ist.  the angle compensation element (40; 50) is designed as a separate component.
Injektor nach Anspruch 8, Injector according to claim 8,
dadurch gekennzeichnet,  characterized,
dass das Winkelausgleichselement (40; 50) auf der dem Stift (30) gegenüberliegenden Seite (47) eine plane Anlagefläche aufweist und, dass die Anlagefläche an dem Stützelement (34) anliegt.  in that the angle compensation element (40; 50) has a planar contact surface on the side (47) opposite the pin (30), and in that the contact surface bears against the support element (34).
10. Injektor nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, 10. Injector according to one of claims 5 to 9, characterized,
dass die Anlageflächen des Stiftes (30) in dem Winkelausgleichselement (40; 50) bzw. die Anlagekante (48; 48a) des Stiftes (30) durch Schleifen ausgebildet sind. Injektor nach einem der Ansprüche 1 bis 10, in that the abutment surfaces of the pin (30) in the angle compensation element (40; 50) or the abutment edge (48; 48a) of the pin (30) are formed by grinding. Injector according to one of claims 1 to 10,
dadurch gekennzeichnet, characterized,
dass im Injektor ein Einspritzglied angeordnet ist, welches mindestens eine Einspritzöffnung freigibt oder verschließt und durch das Steuerventil (1 1 ) angesteuert wird. in that an injection element is arranged in the injector which releases or closes at least one injection opening and is actuated by the control valve (11).
EP10742454.1A 2009-09-18 2010-07-29 Injector Not-in-force EP2478208B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009029563A DE102009029563A1 (en) 2009-09-18 2009-09-18 injector
PCT/EP2010/061023 WO2011032770A1 (en) 2009-09-18 2010-07-29 Injector

Publications (2)

Publication Number Publication Date
EP2478208A1 true EP2478208A1 (en) 2012-07-25
EP2478208B1 EP2478208B1 (en) 2017-09-06

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ID=42880610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10742454.1A Not-in-force EP2478208B1 (en) 2009-09-18 2010-07-29 Injector

Country Status (3)

Country Link
EP (1) EP2478208B1 (en)
DE (1) DE102009029563A1 (en)
WO (1) WO2011032770A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013221554A1 (en) * 2013-10-23 2015-04-23 Robert Bosch Gmbh fuel injector
DE102015202726A1 (en) * 2015-02-16 2016-08-18 Robert Bosch Gmbh Control valve assembly

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021741A1 (en) 2006-05-10 2007-11-15 Robert Bosch Gmbh Fuel injector with pressure compensated control valve
DE102007047425A1 (en) * 2007-10-04 2009-04-09 Robert Bosch Gmbh Control valve for a fuel injector
DE102008003348A1 (en) * 2008-01-07 2009-07-09 Robert Bosch Gmbh fuel injector

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
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See also references of WO2011032770A1 *

Also Published As

Publication number Publication date
EP2478208B1 (en) 2017-09-06
DE102009029563A1 (en) 2011-03-24
WO2011032770A1 (en) 2011-03-24

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