EP1334272B1 - Injector for injecting fuel into a combustion chamber - Google Patents

Injector for injecting fuel into a combustion chamber Download PDF

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Publication number
EP1334272B1
EP1334272B1 EP01993757A EP01993757A EP1334272B1 EP 1334272 B1 EP1334272 B1 EP 1334272B1 EP 01993757 A EP01993757 A EP 01993757A EP 01993757 A EP01993757 A EP 01993757A EP 1334272 B1 EP1334272 B1 EP 1334272B1
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EP
European Patent Office
Prior art keywords
housing
injector
actuator
actuator housing
recess
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 - Lifetime
Application number
EP01993757A
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German (de)
French (fr)
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EP1334272A1 (en
Inventor
Markus Mohr
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Siemens AG
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Siemens AG
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Publication of EP1334272A1 publication Critical patent/EP1334272A1/en
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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
    • F02M61/166—Selection of particular materials
    • 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
    • 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
    • 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
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/05—Fuel-injection apparatus having means for preventing corrosion
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • the invention relates to an injector for injecting Fuel into a combustion chamber.
  • Such an injector usually has an actuator that controls an injection valve. Will the injector through the actuator is opened, fuel is fed into a combustion chamber injected.
  • the actuator actuates a servo valve, which in turn opens the injector hydraulically and closes.
  • the actuator can be controlled electrically.
  • the actuator consists of piezoelectric elements and expands when an electrical voltage is applied.
  • Figure 1 is a cross section through a part an injector with an actuator an actuator housing, one Seal, a projection, a recess, a recess, a top surface, a further recess, a Valve piston, a valve mushroom, a control chamber and one Injector housing shows the structure of a typical injector described.
  • the actuator 10 ' is usually in an actuator housing 4 'arranged while the injector (not shown) and / or the servo valve, for example a Includes valve piston 6 'and a valve mushroom 7' in one Injector housing 1 'are arranged.
  • the injector housing 1 ' has a recess 2' into which Part of the actuator housing 4 'is inserted.
  • the deepening 2 'of the injector housing 1' has a first base which formed as a peripheral top surface 3 'for the actuator housing 4' is.
  • In the middle of this depression 2 ' is another Well 5 'arranged in the servo valve and / or the injection valve are arranged.
  • the servo valve and the injection valve includes, press.
  • the actuator housing 4 On its side Surface from a circumferential recess 11 'in which the Seal 13 ', for example an O-ring seal, arranged is. Due to the recess 11 ', the actuator housing 4' a projection 12 ', which is directed laterally.
  • the seal is stretched around the actuator housing. Subsequently the actuator housing is inserted into the injector housing. The seal rubs against the side walls of the recess of the injector housing. This is particularly important Disadvantage if the recess with a corrosion protection layer to be lined. It turned out that the friction between the seal and the anti-corrosion layer is so large that either the actuator housing cannot be inserted into the injector housing, or but the seal when inserting the actuator housing into it Injector housing is destroyed.
  • the invention has for its object an injector Injecting fuel into a combustion chamber to indicate at which the application of a corrosion protection layer in the recess of the injector housing is possible and at the same time one Leakage along interfaces between the injector housing and the actuator housing is prevented.
  • the problem is solved by an injector for injection of fuel in a combustion chamber with the following characteristics.
  • the injector has an actuator housing and an injector housing on.
  • the injector housing has a recess in which part of the actuator housing is arranged.
  • a bottom of the depression the injector housing is surrounded by a circumferential surface formed for the actuator housing.
  • Between the injector housing and a seal is arranged on the actuator housing to prevent leakage along interfaces between the injector housing and the actuator housing.
  • a bottom of the Actuator housing facing the top surface of the injector housing has a circumferential recess.
  • the recess the bottom of the actuator housing is such that the bottom of the actuator housing at least one circumferential Has projection that to the top surface of the injector housing is directed towards and on the top surface of the injector housing borders.
  • the seal is in the recess in the bottom the actuator housing and arranged around the projection the underside of the actuator housing. The seal borders on the top surface of the injector housing.
  • the seal on the bottom of the actuator housing and not is arranged on the lateral surfaces of the actuator housing no contact between the seal and the side surfaces the recess so that the actuator housing into the recess can be inserted without friction between the seal and deepening.
  • the recess with a Corrosion protection layer to be lined up while due leakage along the existing seal Interfaces between the injector housing and the actuator housing is prevented.
  • the seal can also be much easier in the recess be introduced as before, since the seal is not initially be slipped over a laterally protruding heel which requires increased expansion of the seal.
  • the actuator housing lies directly on the with its projection Contact surface of the injector housing. To usual ones Shims between the actuator housing and the injector housing on the top surface is dispensed with, otherwise the Seal only between the actuator housing and the shim acts, causing leakage between the shim and the injector housing can be done.
  • the idle stroke of the injector which is determined by the distance between the Actuator in the non-activated state and the valve device is determined, can also be set precisely without a shim become.
  • the injector has a servo valve on that of a valve piston and a valve mushroom consists.
  • the valve mushroom separates one control chamber from one Return line.
  • the valve mushroom is, for example, by a spring located in the control chamber against its seat pressed.
  • the valve piston is arranged outside the control chamber, that is in contact with the valve mushroom.
  • the valve piston is like this in one from the center of the depression outgoing further recess of the injector housing arranged, that a linear expansion of the actuator leads to a shift of the valve piston.
  • the displacement of the valve piston leads to the valve mushroom against the force of the Spring is lifted from its seat.
  • To adjust the Empty stroke of the injector is, for example, the distance between the top surface of the injector housing and the Surface of the valve mushroom facing away from the control chamber. Depending on this distance, the one for a given one Idle stroke determines the length of the valve piston required.
  • the Valve piston is chosen so that it has the required length has, and then inserted into the injector housing.
  • the actuator housing is inserted into the recess of the injector housing inserted.
  • the recess on the underside of the actuator housing can be designed in this way be that the bottom of the actuator housing two Has protrusions: an inner protrusion and an outer, the inner surrounding ledge.
  • the seal is in this case between the inner protrusion and the outer Projection arranged.
  • the recess is preferably the underside of the actuator housing such that the bottom of the actuator housing has only a single circumferential projection around which the Seal is cocked. In this case there is no outside Head Start.
  • the seal can be more easily inserted into the Recess are used.
  • Another advantage is there in that the depression of the injector housing with less Effort can be produced, which is explained below becomes.
  • the groove edge is used to create the recess of the injector housing between the side walls of the recess and the top surface of the injector housing is first rounded.
  • An actuator housing with non-rounded edges can be in such a depression not up to the top surface of the injector housing be introduced. Before that, the deepening must continue processed by widening the groove edges, so that the edges of the actuator housing are expanded into the Fit the groove edges.
  • the depression of the injector housing is preferably with a Corrosion protection layer lined.
  • the corrosion protection layer consists essentially of, for example Zinc phosphate.
  • the seal can be made essentially of an elastomer, such as z. B. fluororubber exist.
  • the Projection is formed such that its the side surface surface facing the depression of the injector housing is.
  • the inclination is such that the projection in the area the top surface of the injector housing the side surfaces of the recess is located in the area of its Approach.
  • the injector has an injector housing 1 with a recess 2 on.
  • the recess 2 of the injector housing 1 is with a approx. 2-3 ⁇ m thick corrosion protection layer 14 lined.
  • the Corrosion protection layer 14 consists of zinc phosphate.
  • a bottom of the recess 2 of the injector housing 1 is through a circumferential top surface 3 for an actuator housing 4 is formed.
  • the injector housing 1 In the middle of the recess 2, the injector housing 1 a further recess 5.
  • a valve piston 6 and a valve mushroom 7 are arranged, the to be in contact with each other.
  • the valve mushroom 7 separates one Control chamber 8 from a return line 15.
  • the valve mushroom 7 is arranged in the control chamber 8 by a spring 9 in pressed its valve seat.
  • part of the actuator housing 4 is arranged.
  • a piezoelectric actuator 10 is arranged in the actuator housing 4.
  • the actuator 10 is in this way relative to the valve piston 6 arranged that with a longitudinal expansion of the actuator 10 by Applying a voltage exerts a force on the valve piston 6 is, so that the valve piston 6 downward direction Valve seat 7 moves and the valve seat 7 from its Seat lifts.
  • the actuator housing 4 On its underside, the actuator housing 4 has which faces the discharge surface 3 of the injector housing 1, a circumferential recess 11. This reces 11 is such that the underside of the actuator housing 4 exactly one has circumferential projection 12 to the top surface 3 of the injector housing 1 is directed and to the top surface 3 of the injector housing 1 is adjacent.
  • the projection 12 of the The underside of the actuator housing 4 has one of the side surfaces the recess 2 of the injector housing 1 facing side Surface that is inclined. This widened the projection 12 of the underside of the actuator housing 4 in Direction of the top surface 3 of the injector housing 1.
  • a seal 13 in the form of a ring is in the recess 11 the bottom of the actuator housing 4 and arranged around the projection 12 excited.
  • the seal 13 is between the actuator housing 4 and the injector housing 1 arranged such that they adjacent to the top surface 3 of the injector housing 1.
  • the Seal 13 is made of fluororubber.
  • valve mushroom 7 If the valve mushroom 7 is activated by actuating the actuator 10 its seat raised, the pressure of the fuel drops in the control chamber 8. In a hydraulic manner, this is a injector, not shown, raised from its seat, so that fuel is injected into a combustion chamber.

Abstract

An injector housing (1) of the injector has an indentation (2) in which a part of an actuator housing (4) of the injector is located. A floor of said indentation (2) is formed by a peripheral support surface (3) for the actuator housing (4). A bottom surface of the actuator housing (4) is oriented towards the support surface (3) and has a peripheral recess (11). This recess (11) is such that the bottom surface of the actuator housing (4) has at least one peripheral projection (12), which is oriented towards the support surface (3) and is adjacent to the support surface (3). A seal (13) for preventing leakage along interfaces between the injector housing (1) and the actuator housing (4) is located in the recess (11) and is adjacent to the support surface (3).

Description

Die Erfindung betrifft einen Injektor zum Einspritzen von Kraftstoff in einen Brennraum.The invention relates to an injector for injecting Fuel into a combustion chamber.

Ein solcher Injektor weist in der Regel einen Aktor auf, der ein Einspritzventil steuert. Wird das Einspritzventil durch den Aktor geöffnet, so wird Kraftstoff in einen Brennraum eingespritzt. Beispielsweise betätigt der Aktor ein Servoventil, das wiederum hydraulisch das Einspritzventil öffnet und schließt. Der Aktor kann elektrisch angesteuert werden. Beispielsweise besteht der Aktor aus piezoelektrischen Elementen und dehnt sich bei Anlegen einer elektrischen Spannung.Such an injector usually has an actuator that controls an injection valve. Will the injector through the actuator is opened, fuel is fed into a combustion chamber injected. For example, the actuator actuates a servo valve, which in turn opens the injector hydraulically and closes. The actuator can be controlled electrically. For example the actuator consists of piezoelectric elements and expands when an electrical voltage is applied.

Anhand der Figur 1, die einen Querschnitt durch einen Teil eines Injektors mit einem Aktor einem Aktorgehäuse, einer Dichtung, einem Vorsprung, einer Ausnehmung, einer Vertiefung, einer Aufsatzfläche, einer weiteren Vertiefung, einem Ventilkolben, einem Ventilpilz, einer Steuerkammer und einem Injektorgehäuse zeigt, wird der Aufbau eines typischen Injektors beschrieben. Der Aktor 10' ist in der Regel in einem Aktorgehäuse 4' angeordnet, während das Einspritzventil (nicht dargestellt) und/oder das Servoventil, das beispielsweise einen Ventilkolben 6' und einen Ventilpilz 7' umfasst, in einem Injektorgehäuse 1' angeordnet sind. Der Ventilpilz 7' trennt eine Steuerkammer 8' von einer Rücklaufleitung 15'. Das Injektorgehäuse 1' weist eine Vertiefung 2' auf, in die ein Teil des Aktorgehäuses 4' eingeschoben wird. Die Vertiefung 2' des Injektorgehäuses 1' weist einen ersten Boden auf, der als umlaufende Aufsatzfläche 3' für das Aktorgehäuse 4' ausgebildet ist. In der Mitte dieser Vertiefung 2' ist eine weitere Vertiefung 5' angeordnet, in der das Servoventil und/oder das Einspritzventil angeordnet sind. Nach dem Einschieben des Aktorgehäuses 4' in das Injektorgehäuse 1' kann der Aktor 10' die in der weiteren Vertiefung 5' angeordnete Ventileinrichtung, die das Servoventil und das Einspritzventil umfasst, betätigen. Eine Längsdehnung des Aktors 10' verschiebt den Ventilkolben 6' Richtung Ventilpilz 7' und hebt diesen entgegen der Kraft einer Feder 9' von seinem Ventilsitz ab. Der Druckabfall in der Steuerkammer 8' bewirkt hydraulisch das Öffnen des Einspritzventils.Based on Figure 1, which is a cross section through a part an injector with an actuator an actuator housing, one Seal, a projection, a recess, a recess, a top surface, a further recess, a Valve piston, a valve mushroom, a control chamber and one Injector housing shows the structure of a typical injector described. The actuator 10 'is usually in an actuator housing 4 'arranged while the injector (not shown) and / or the servo valve, for example a Includes valve piston 6 'and a valve mushroom 7' in one Injector housing 1 'are arranged. The valve mushroom 7 'separates a control chamber 8 'from a return line 15'. The injector housing 1 'has a recess 2' into which Part of the actuator housing 4 'is inserted. The deepening 2 'of the injector housing 1' has a first base which formed as a peripheral top surface 3 'for the actuator housing 4' is. In the middle of this depression 2 'is another Well 5 'arranged in the servo valve and / or the injection valve are arranged. After insertion of the actuator housing 4 'into the injector housing 1' the actuator 10 'arranged in the further recess 5' Valve device, the servo valve and the injection valve includes, press. A longitudinal expansion of the actuator 10 'shifts the valve piston 6 'in the direction of the valve mushroom 7' and lifts this against the force of a spring 9 'from its valve seat from. The pressure drop in the control chamber 8 'causes hydraulic opening the injector.

Zur genauen Einstellung des Leerhubs zwischen dem Aktor 10' und der Ventileinrichtung ist eine geeignete Einstellscheibe E' auf der Aufsatzfläche 3' des Injektorgehäusesl' angeordnet.For precise adjustment of the idle stroke between the actuator 10 ' and the valve device is a suitable shim E 'arranged on the top surface 3' of the injector housing 1 '.

Damit Kraftstoff, der sich in der Ventileinrichtung befindet, nicht entlang der Grenzflächen zwischen dem Injektorgehäuse 1' und dem Aktorgehäuse 4' abfließen kann, ist eine Dichtung 13' zwischen dem Injektorgehäuse 1' und dem Aktorgehäuse 4' vorgesehen. Dazu weist das Aktorgehäuse 4' an seiner seitlichen Fläche eine umlaufende Ausnehmung 11' aus, in der die Dichtung 13', beispielsweise eine O-Ring-Dichtung, angeordnet ist. Aufgrund der Ausnehmung 11' weist das Aktorgehäuse 4' einen Vorsprung 12' auf, der seitlich gerichtet ist.So that fuel, which is in the valve device, not along the interfaces between the injector housing 1 'and the actuator housing 4' can flow is a seal 13 'between the injector housing 1' and the actuator housing 4 ' intended. For this purpose, the actuator housing 4 'on its side Surface from a circumferential recess 11 'in which the Seal 13 ', for example an O-ring seal, arranged is. Due to the recess 11 ', the actuator housing 4' a projection 12 ', which is directed laterally.

Die Dichtung wird um das Aktorgehäuse gespannt. Anschließend wird das Aktorgehäuse in das Injektorgehäuse eingeschoben. Dabei reibt die Dichtung an den Seitenwänden der Vertiefung des Injektorgehäuses. Dies stellt insbesondere dann einen Nachteil dar, wenn die Vertiefung mit einer Korrosionsschutzschicht ausgekleidet werden soll. Es hat sich herausgestellt, dass die Reibung zwischen der Dichtung und der Korrosionsschutzschicht so groß ist, dass entweder das Aktorgehäuse nicht in das Injektorgehäuse eingeschoben werden kann, oder aber die Dichtung beim Einschieben des Aktorgehäuses in das Injektorgehäuse zerstört wird.The seal is stretched around the actuator housing. Subsequently the actuator housing is inserted into the injector housing. The seal rubs against the side walls of the recess of the injector housing. This is particularly important Disadvantage if the recess with a corrosion protection layer to be lined. It turned out that the friction between the seal and the anti-corrosion layer is so large that either the actuator housing cannot be inserted into the injector housing, or but the seal when inserting the actuator housing into it Injector housing is destroyed.

Noch ein Injektor mit Aktorhäusedichtung ist aus Dokument US 5630400A bekannt.Another injector with an actuator housing seal is from the document US 5630400A known.

Der Erfindung liegt die Aufgabe zugrunde, einen Injektor zum Einspritzen von Kraftstoff in einen Brennraum anzugeben, bei dem die Anbringung einer Korrosionsschutzschicht in der Vertiefung des Injektorgehäuses möglich ist und zugleich eine Leckage entlang Grenzflächen zwischen dem Injektorgehäuse und dem Aktorgehäuse verhindert wird.The invention has for its object an injector Injecting fuel into a combustion chamber to indicate at which the application of a corrosion protection layer in the recess of the injector housing is possible and at the same time one Leakage along interfaces between the injector housing and the actuator housing is prevented.

Die Aufgabe wird gelöst durch einen Injektor zum Einspritzen von Kraftstoff in einen Brennraum mit folgenden Merkmalen. Der Injektor weist ein Aktorgehäuse und ein Injektorgehäuse auf. Das Injektorgehäuse weist eine Vertiefung auf, in der ein Teil des Aktorgehäuses angeordnet ist. Ein Boden der Vertiefung des Injektorgehäuses wird durch eine umlaufende Aufsatzfläche für das Aktorgehäuse gebildet. Zwischen dem Injektorgehäuse und dem Aktorgehäuse ist eine Dichtung angeordnet zur Verhinderung von Leckage entlang Grenzflächen zwischen dem Injektorgehäuse und dem Aktorgehäuse. Eine Unterseite des Aktorgehäuses, die der Aufsatzfläche des Injektorgehäuses zugewandt ist, weist eine umlaufende Ausnehmung auf. Die Ausnehmung der Unterseite des Aktorgehäuses ist dergestalt, dass die Unterseite des Aktorgehäuses mindestens einen umlaufenden Vorsprung aufweist, der zur Aufsatzfläche des Injektorgehäuses hin gerichtet ist und an die Aufsatzfläche des Injektorgehäuses angrenzt. Die Dichtung ist in der Ausnehmung der Unterseite des Aktorgehäuses angeordnet und um den Vorsprung der Unterseite des Aktorgehäuses gespannt. Die Dichtung grenzt an die Aufsatzfläche des Injektorgehäuses an.The problem is solved by an injector for injection of fuel in a combustion chamber with the following characteristics. The injector has an actuator housing and an injector housing on. The injector housing has a recess in which part of the actuator housing is arranged. A bottom of the depression the injector housing is surrounded by a circumferential surface formed for the actuator housing. Between the injector housing and a seal is arranged on the actuator housing to prevent leakage along interfaces between the injector housing and the actuator housing. A bottom of the Actuator housing facing the top surface of the injector housing has a circumferential recess. The recess the bottom of the actuator housing is such that the bottom of the actuator housing at least one circumferential Has projection that to the top surface of the injector housing is directed towards and on the top surface of the injector housing borders. The seal is in the recess in the bottom the actuator housing and arranged around the projection the underside of the actuator housing. The seal borders on the top surface of the injector housing.

Da die Dichtung an der Unterseite des Aktorgehäuses und nicht an seitlichen Flächen des Aktorgehäuses angeordnet ist, besteht kein Kontakt zwischen der Dichtung und den Seitenflächen der Vertiefung, so dass das Aktorgehäuse in die Vertiefung eingeführt werden kann ohne Reibung zwischen der Dichtung und der Vertiefung. Folglich kann die Vertiefung mit einer Korrosionsschutzschicht ausgekleidet sein, während aufgrund der vorhandenen Dichtung zugleich eine Leckage entlang Grenzflächen zwischen dem Injektorgehäuse und dem Aktorgehäuse verhindert wird. Because the seal on the bottom of the actuator housing and not is arranged on the lateral surfaces of the actuator housing no contact between the seal and the side surfaces the recess so that the actuator housing into the recess can be inserted without friction between the seal and deepening. As a result, the recess with a Corrosion protection layer to be lined up while due leakage along the existing seal Interfaces between the injector housing and the actuator housing is prevented.

Die Dichtung kann auch wesentlich leichter in die Ausnehmung eingebracht werden als bisher, da die Dichtung nicht zunächst über einen seitlich herausragenden Absatz gestreift werden muss, der eine verstärkte Dehnung der Dichtung erfordert.The seal can also be much easier in the recess be introduced as before, since the seal is not initially be slipped over a laterally protruding heel which requires increased expansion of the seal.

Das Aktorgehäuse liegt mit seinem Vorsprung direkt auf der Aufsatzfläche des Injektorgehäuses auf. Auf sonst übliche Einstellscheiben zwischen dem Aktorgehäuse und dem Injektorgehäuse auf der Aufsatzfläche wird verzichtet, da sonst die Dichtung nur zwischen dem Aktorgehäuse und der Einstellscheibe wirkt, so dass eine Leckage zwischen der Einstellscheibe und dem Injektorgehäuse erfolgen kann.The actuator housing lies directly on the with its projection Contact surface of the injector housing. To usual ones Shims between the actuator housing and the injector housing on the top surface is dispensed with, otherwise the Seal only between the actuator housing and the shim acts, causing leakage between the shim and the injector housing can be done.

Der Leerhub des Injektors, der durch den Abstand zwischen dem Aktor im nicht angesteuerten Zustand und der Ventileinrichtung bestimmt wird, kann auch ohne Einstellscheibe genau eingestellt werden. Beispielsweise weist der Injektor ein Servoventil auf, der aus einem Ventilkolben und einem Ventilpilz besteht. Der Ventilpilz trennt eine Steuerkammer von einer Rücklaufleitung. Der Ventilpilz wird beispielsweise durch eine in der Steuerkammer angeordnete Feder gegen seinen Sitz gepresst. Außerhalb der Steuerkammer ist der Ventilkolben angeordnet, der in Berührung mit den Ventilpilz steht. Der Ventilkolben ist derart in einer von der Mitte der Vertiefung ausgehenden weiteren Vertiefung des Injektorgehäuses angeordnet, dass eine Längenausdehnung des Aktors zu einer Verschiebung des Ventilkolbens führt. Die Verschiebung des Ventilkolbens führt dazu, dass der Ventilpilz entgegen der Kraft der Feder von seinem Sitz angehoben wird. Zur Einstellung des Leerhubs des Injektors wird beispielsweise der Abstand zwischen der Aufsatzfläche des Injektorgehäuses und der der Steuerkammer abgewandten Fläche des Ventilpilzes gemessen. Abhängig von diesem Abstand wird die für einen vorgegebenen Leerhub erforderliche Länge des Ventilkolbens bestimmt. Der Ventilkolben wird so gewählt, dass er die erforderliche Länge aufweist, und anschließend in das Injektorgehäuse eingesetzt. The idle stroke of the injector, which is determined by the distance between the Actuator in the non-activated state and the valve device is determined, can also be set precisely without a shim become. For example, the injector has a servo valve on that of a valve piston and a valve mushroom consists. The valve mushroom separates one control chamber from one Return line. The valve mushroom is, for example, by a spring located in the control chamber against its seat pressed. The valve piston is arranged outside the control chamber, that is in contact with the valve mushroom. The valve piston is like this in one from the center of the depression outgoing further recess of the injector housing arranged, that a linear expansion of the actuator leads to a shift of the valve piston. The displacement of the valve piston leads to the valve mushroom against the force of the Spring is lifted from its seat. To adjust the Empty stroke of the injector is, for example, the distance between the top surface of the injector housing and the Surface of the valve mushroom facing away from the control chamber. Depending on this distance, the one for a given one Idle stroke determines the length of the valve piston required. The Valve piston is chosen so that it has the required length has, and then inserted into the injector housing.

Danach wird das Aktorgehäuse in die Vertiefung des Injektorgehäuses eingeschoben.Then the actuator housing is inserted into the recess of the injector housing inserted.

Die Ausnehmung der Unterseite des Aktorgehäuses kann so ausgestaltet sein, dass die Unterseite des Aktorgehäuses zwei Vorsprünge aufweist: Einen inneren Vorsprung und einen äußeren, den inneren umgebenden Vorsprung. Die Dichtung ist in diesem Fall zwischen dem inneren Vorsprung und dem äußeren Vorsprung angeordnet.The recess on the underside of the actuator housing can be designed in this way be that the bottom of the actuator housing two Has protrusions: an inner protrusion and an outer, the inner surrounding ledge. The seal is in this case between the inner protrusion and the outer Projection arranged.

Vorzugsweise ist jedoch die Ausnehmung der Unterseite des Aktorgehäuses dergestalt, dass die Unterseite des Aktorgehäuses nur einen einzigen umlaufenden Vorsprung aufweist, um den die Dichtung gespannt ist. In diesem Fall gibt es keinen äußeren Vorsprung.However, the recess is preferably the underside of the actuator housing such that the bottom of the actuator housing has only a single circumferential projection around which the Seal is cocked. In this case there is no outside Head Start.

Bei einem solchen Injektor kann die Dichtung leichter in die Ausnehmung eingesetzt werden. Ein weiterer Vorteil besteht darin, dass die Vertiefung des Injektorgehäuses mit geringerem Aufwand hergestellt werden kann, was im Folgenden erläutert wird. Bei der Erzeugung der Vertiefung ist die Nutkante des Injektorgehäuses zwischen den Seitenwänden der Vertiefung und der Aufsatzfläche des Injektorgehäuses zunächst abgerundet. Ein Aktorgehäuse mit nicht abgerundeten Kanten kann in eine solche Vertiefung nicht bis zur Aufsatzfläche des Injektorgehäuses eingeführt werden. Zuvor muss die Vertiefung weiter bearbeitet werden, indem die Nutkanten aufgeweitet werden, so dass die Kanten des Aktorgehäuses in die aufgeweiteten Nutkanten hineinpassen. Auf diese zusätzliche Maßnahme kann verzichtet werden, wenn die Ausnehmung der Unterseite des Aktorgehäuses dergestalt ist, dass die Unterseite nur einen einzigen umlaufenden Vorsprung aufweist. In diesem Fall ist nämlich die äußere störende Kante des Aktorgehäuses gar nicht vorhanden. Es handelt sich sozusagen um eine starke Abrundung der Kante. Die Vertiefung des Injektorgehäuses kann folglich mit weniger Aufwand hergestellt werden. Im Übrigen ist eine Aufweitung der Nutkante des Injektorgehäuses auch für die Festigkeit des Injektors gegenüber Hochdruck nachteilig, da erhöhte Kerbspannungen auftreten.With such an injector, the seal can be more easily inserted into the Recess are used. Another advantage is there in that the depression of the injector housing with less Effort can be produced, which is explained below becomes. The groove edge is used to create the recess of the injector housing between the side walls of the recess and the top surface of the injector housing is first rounded. An actuator housing with non-rounded edges can be in such a depression not up to the top surface of the injector housing be introduced. Before that, the deepening must continue processed by widening the groove edges, so that the edges of the actuator housing are expanded into the Fit the groove edges. On this additional measure can be dispensed with if the recess is the bottom of the actuator housing is such that the underside is only one has a single circumferential projection. In this case namely the outer disruptive edge of the actuator housing is done unavailable. It is, so to speak, a strong rounding off the edge. The depression of the injector housing can consequently can be produced with less effort. Furthermore is a widening of the groove edge of the injector housing too disadvantageous for the strength of the injector compared to high pressure, since increased notch stresses occur.

Vorzugsweise ist die Vertiefung des Injektorgehäuses mit einer Korrosionsschutzschicht ausgekleidet. Die Korrosionsschutzschicht besteht beispielsweise im Wesentlichen aus Zinkphosphat.The depression of the injector housing is preferably with a Corrosion protection layer lined. The corrosion protection layer consists essentially of, for example Zinc phosphate.

Die Dichtung kann im Wesentlichen aus einem Elastomer, wie z. B. Fluorkautschuk, bestehen.The seal can be made essentially of an elastomer, such as z. B. fluororubber exist.

Damit die Dichtung vor dem Einsetzen des Aktorgehäuses in das Injektorgehäuse nicht aus der Ausnehmung der Unterseite des Aktorgehäuses herausrutscht, ist es vorteilhaft, wenn der Vorsprung derart ausgebildet ist, dass seine der Seitenfläche der Vertiefung des Injektorgehäuses zugewandte Fläche geneigt ist. Die Neigung ist dabei derart, dass der Vorsprung im Bereich der Aufsatzfläche des Injektorgehäuses sich näher zu den Seitenflächen der Vertiefung befindet als im Bereich seines Ansatzes.So that the seal before inserting the actuator housing in the Injector housing does not come out of the recess in the bottom of the Actuator housing slips out, it is advantageous if the Projection is formed such that its the side surface surface facing the depression of the injector housing is. The inclination is such that the projection in the area the top surface of the injector housing the side surfaces of the recess is located in the area of its Approach.

Im Folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Figur 2 näher erläutert.

Figur 2
zeigt einen Querschnitt durch einen Teil eines Injektors mit einem Aktor, einem Aktorgehäuse, einer Dichtung, einem Vorsprung, einer Ausnehmung, einer Vertiefung, einer Aufsatzfläche, einer weiteren Vertiefung, einem Ventilkolben, einem Ventilpilz, einer Steuerkammer und einem Injektorgehäuse.
An exemplary embodiment of the invention is explained in more detail below with reference to FIG. 2.
Figure 2
shows a cross section through part of an injector with an actuator, an actuator housing, a seal, a projection, a recess, a depression, a mounting surface, a further depression, a valve piston, a valve mushroom, a control chamber and an injector housing.

Der Injektor weist ein Injektorgehäuse 1 mit einer Vertiefung 2 auf. Die Vertiefung 2 des Injektorgehäuses 1 ist mit einer ca. 2-3µm dicken Korrosionsschutzschicht 14 ausgekleidet. Die Korrosionsschutzschicht 14 besteht aus Zinkphosphat. The injector has an injector housing 1 with a recess 2 on. The recess 2 of the injector housing 1 is with a approx. 2-3µm thick corrosion protection layer 14 lined. The Corrosion protection layer 14 consists of zinc phosphate.

Ein Boden der Vertiefung 2 des Injektorgehäuses 1 wird durch eine umlaufende Aufsatzfläche 3 für ein Aktorgehäuse 4 gebildet. In der Mitte der Vertiefung 2 weist das Injektorgehäuse 1 eine weitere Vertiefung 5 auf. In der weiteren Vertiefung 5 sind ein Ventilkolben 6 und ein Ventilpilz 7 angeordnet, die miteinander in Berührung stehen. Der Ventilpilz 7 trennt eine Steuerkammer 8 von einer Rücklaufleitung 15. Der Ventilpilz 7 wird durch eine in der Steuerkammer 8 angeordnete Feder 9 in seinen Ventilsitz gepresst. In der Vertiefung 2 des Injektorgehäuses 1 ist ein Teil des Aktorgehäuses 4 angeordnet.A bottom of the recess 2 of the injector housing 1 is through a circumferential top surface 3 for an actuator housing 4 is formed. In the middle of the recess 2, the injector housing 1 a further recess 5. In the further deepening 5 a valve piston 6 and a valve mushroom 7 are arranged, the to be in contact with each other. The valve mushroom 7 separates one Control chamber 8 from a return line 15. The valve mushroom 7 is arranged in the control chamber 8 by a spring 9 in pressed its valve seat. In the recess 2 of the injector housing 1, part of the actuator housing 4 is arranged.

In dem Aktorgehäuse 4 ist ein piezoelektrischer Aktor 10 angeordnet. Der Aktor 10 ist derart relativ zum Ventilkolben 6 angeordnet, dass bei einer Längsdehnung des Aktors 10 durch Anlegen einer Spannung eine Kraft auf den Ventilkolben 6 ausgeübt wird, so dass der Ventilkolben 6 sich nach unten Richtung Ventilpilz 7 verschiebt und den Ventilpilz 7 von seinem Sitz anhebt. Das Aktorgehäuse 4 weist an seiner Unterseite, die der Ausatzfläche 3 des Injektorgehäuses 1 zugewandt ist, eine umlaufende Ausnehmung 11 auf. Diese Ausnehmung 11 ist dergestalt, dass die Unterseite des Aktorgehäuses 4 genau einen umlaufenden Vorsprung 12 aufweist, der zur Aufsatzfläche 3 des Injektorgehäuses 1 gerichtet ist und an die Aufsatzfläche 3 des Injektorgehäuses 1 angrenzt. Der Vorsprung 12 der Unterseite des Aktorgehäuses 4 weist eine der Seitenfläche der Vertiefung 2 des Injektorgehäuses 1 zugewandte seitliche Fläche auf, die schräg ausgebildet ist. Dadurch verbreitert sich der Vorsprung 12 der Unterseite des Aktorgehäuses 4 in Richtung der Aufsatzfläche 3 des Injektorgehäuses 1.A piezoelectric actuator 10 is arranged in the actuator housing 4. The actuator 10 is in this way relative to the valve piston 6 arranged that with a longitudinal expansion of the actuator 10 by Applying a voltage exerts a force on the valve piston 6 is, so that the valve piston 6 downward direction Valve seat 7 moves and the valve seat 7 from its Seat lifts. On its underside, the actuator housing 4 has which faces the discharge surface 3 of the injector housing 1, a circumferential recess 11. This recess 11 is such that the underside of the actuator housing 4 exactly one has circumferential projection 12 to the top surface 3 of the injector housing 1 is directed and to the top surface 3 of the injector housing 1 is adjacent. The projection 12 of the The underside of the actuator housing 4 has one of the side surfaces the recess 2 of the injector housing 1 facing side Surface that is inclined. This widened the projection 12 of the underside of the actuator housing 4 in Direction of the top surface 3 of the injector housing 1.

Eine Dichtung 13 in Form eines Rings ist in der Ausnehmung 11 der Unterseite des Aktorgehäuses 4 angeordnet und um den Vorsprung 12 gespannt. Die Dichtung 13 ist zwischen dem Aktorgehäuse 4 und dem Injektorgehäuse 1 derart angeordnet, dass sie an die Aufsatzfläche 3 des Injektorgehäuses 1 angrenzt. Die Dichtung 13 besteht aus Fluorkautschuk. A seal 13 in the form of a ring is in the recess 11 the bottom of the actuator housing 4 and arranged around the projection 12 excited. The seal 13 is between the actuator housing 4 and the injector housing 1 arranged such that they adjacent to the top surface 3 of the injector housing 1. The Seal 13 is made of fluororubber.

Wird der Ventilpilz 7 durch Ansteuerung der Aktors 10 von seinem Sitz angehoben, so sinkt der Druck des Kraftstoffs in der Steuerkammer 8. Auf hydraulische Weise wird dadurch ein nicht dargestelltes Einspritzventil von seinem Sitz angehoben, so dass Kraftstoff in einen Brennraum eingespritzt wird.If the valve mushroom 7 is activated by actuating the actuator 10 its seat raised, the pressure of the fuel drops in the control chamber 8. In a hydraulic manner, this is a injector, not shown, raised from its seat, so that fuel is injected into a combustion chamber.

Claims (4)

  1. Injector for injecting fuel into a combustion chamber
    having an actuator housing (4) and an injector housing (1),
    wherein the injector housing (1) has a cavity (2) in which part of the actuator housing (4) is disposed,
    wherein a floor of the cavity (2) of the injector housing (1) is formed by a circumferential seating surface (3) for the actuator housing (4),
    wherein a seal (13) is disposed between the injector housing (1) and the actuator housing (4) to prevent leakage along interfaces between the injector housing (1) and the actuator housing (4),
    wherein an underside of the actuator housing (4) facing the seating surface (3) of the injector housing (1) has a circumferential recess (11),
    wherein the recess (11) in the underside of the actuator housing (4) is designed so that the underside of the actuator housing (4) has at least one circumferential projection (12) oriented toward the seating surface (3) of the injector housing (1) and adjoining the seating surface (3) of the injector housing.(1),
    wherein the seal (13) is disposed in the recess (11) in the underside of the actuator housing (4) and tensioned around the projection (12) in the underside of the actuator housing (4) and adjoins the seating surface (3) of the injector housing (1),
    wherein the recess (11) in the underside of the actuator housing (4) is designed so that the underside of the actuator housing (4) has a single circumferential projection (12) around which the seal (13) is tensioned
       characterized in that
    a lateral surface of the projection (12) of the underside of the actuator housing (4), said lateral surface facing a side surface of the cavity (2) of the injector housing (1), is obliquely formed in such a way that the shoulder of the projection (12) is disposed further away from the side surface of the cavity (2) than a part of the projection (12) adjoining the seating surface (3) of the injector housing (1).
  2. Injector according to Claim 1,
    wherein the cavity (2) of the injector housing (1) is provided with a corrosion-resistant coating (14).
  3. Injector according to Claim 2,.
    wherein the corrosion-resistant coating (14) consists essentially of zinc phosphate.
  4. Injector according to one of Claims 1 to 3,
    wherein the seal (13) essentially consists of an elastomer.
EP01993757A 2000-11-10 2001-11-06 Injector for injecting fuel into a combustion chamber Expired - Lifetime EP1334272B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10055639 2000-11-10
DE10055639A DE10055639A1 (en) 2000-11-10 2000-11-10 Injector for injecting fuel into combustion chamber has recess running round underside of actuator housing
PCT/DE2001/004168 WO2002038942A1 (en) 2000-11-10 2001-11-06 Injector for injecting fuel into a combustion chamber

Publications (2)

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EP1334272A1 EP1334272A1 (en) 2003-08-13
EP1334272B1 true EP1334272B1 (en) 2004-05-26

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ID=7662757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01993757A Expired - Lifetime EP1334272B1 (en) 2000-11-10 2001-11-06 Injector for injecting fuel into a combustion chamber

Country Status (4)

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US (1) US7025292B2 (en)
EP (1) EP1334272B1 (en)
DE (2) DE10055639A1 (en)
WO (1) WO2002038942A1 (en)

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Also Published As

Publication number Publication date
US7025292B2 (en) 2006-04-11
EP1334272A1 (en) 2003-08-13
DE10055639A1 (en) 2002-05-23
US20030226912A1 (en) 2003-12-11
WO2002038942A1 (en) 2002-05-16
DE50102438D1 (en) 2004-07-01

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