EP2596231B1 - Fuel injector having a hydraulic coupler unit - Google Patents

Fuel injector having a hydraulic coupler unit Download PDF

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Publication number
EP2596231B1
EP2596231B1 EP11724414.5A EP11724414A EP2596231B1 EP 2596231 B1 EP2596231 B1 EP 2596231B1 EP 11724414 A EP11724414 A EP 11724414A EP 2596231 B1 EP2596231 B1 EP 2596231B1
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EP
European Patent Office
Prior art keywords
coupler
piston
valve piston
fuel injector
section
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.)
Not-in-force
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EP11724414.5A
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German (de)
French (fr)
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EP2596231A1 (en
Inventor
Holger Rapp
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2596231A1 publication Critical patent/EP2596231A1/en
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Publication of EP2596231B1 publication Critical patent/EP2596231B1/en
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    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • 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

Definitions

  • the invention relates to a fuel injector with a hydraulic coupler unit according to the preamble of claim 1.
  • a fuel injector in which, inter alia, a hydraulic coupler unit is arranged in an injector housing.
  • the hydraulic coupler unit comprises a coupler body, in which a coupler piston and a valve piston are each guided axially displaceably, wherein both components define between them a fuel space filled with fuel, which forms a so-called coupler gap volume.
  • the coupler piston is in communication with an actuator element whose operation causes a translational movement of the coupler piston in the direction of the pressure chamber against a biasing spring, which is arranged coaxially outside the coupler body and on the one hand a return movement of the coupler piston after the operation and on the other a necessary bias Actuator ensured.
  • the overall length of the hydraulic coupler unit is essentially determined by the sum of the lengths of the valve piston and the coupler piston, ie from the lengths of the pistons guided in the coupler body. Furthermore, upon pressurization of the coupler gap, a widening of the guide clearance or of the guide gap occurs both on the coupler piston and on the valve piston.
  • a disadvantage of this technical solution is that the sleeve-shaped part of the coupler between coupler piston and valve piston at the required in the fuel injector ratios a very small wall thickness of less than 1 mm, which at the same time there is a requirement, the coupler piston on the lateral surface and the valve piston on the inner bore to lead with little play. This places increased demands on the production technology in the production of the coupler unit.
  • a generic coupler unit is from the DE-A-10145620 known.
  • Object of the present invention is to provide a coupler unit, on the one hand has the same functional advantages, but on the other hand allows the execution of the components with larger wall thicknesses, thereby reducing the demands on the manufacturing technology for guiding the valve piston and coupler piston.
  • the object of the invention is achieved with the characterizing features of claim 1.
  • the main advantage of the coupler unit according to the invention is that no high-precision guides on thin-walled sleeves are required, so that no increased requirements have to be made of the production technology.
  • the essence of the invention is that the radial arrangement of coupler body and valve piston undergoes a kind of commutation by the valve piston has a sleeve-shaped guide portion and in the inner bore of the sleeve-shaped guide portion a housing fixedly arranged guide piston of the coupler body is arranged, on which the sleeve-shaped guide section axially is.
  • the sleeve-shaped valve piston thus has an annular end surface with an outer diameter d 1 and an inner diameter d3.
  • the reduced overall length of the coupler unit is achieved, in particular, by the coupler piston with the diameter d1 being guided axially displaceably on an outer peripheral surface of the sleeve-shaped guide section of the valve piston.
  • the coupler piston with the diameter d1 being guided axially displaceably on an outer peripheral surface of the sleeve-shaped guide section of the valve piston.
  • coupler unit requires that either coupler body or valve piston are to be formed from at least two individual components, because in a respective one-piece design of both components of the valve piston can not be pushed over the guide piston of the coupler body.
  • the sleeve-shaped guide portion on an outer peripheral surface on which the coupler piston is guided axially displaceably with an inner guide surface.
  • the coupler body has a support portion, which is supported on a housing-fixed component, wherein the valve piston is formed with the sleeve-shaped guide portion on one side of the support portion and with a pressure portion on the other side of the support portion.
  • the head body is made in several parts, with one part forming the guide piston and at least one further part forming the support section.
  • This alternative is carried out, for example, by the support section being designed by a transverse web and a support ring, wherein the crosspiece engages through the valve piston with an axial play.
  • the valve piston is designed in several parts with at least one upper part and at least one lower part, the upper part being formed by the sleeve-shaped guide section and the lower part by the pressure section.
  • coupling pin are formed between upper part and lower part, which pass through the support portion of the coupler body.
  • the support portion is designed with a plate-shaped disc, are formed in the apertures through which engage the coupling pin.
  • the coupling pins can be arranged on the sleeve-shaped guide section and / or on the pressure section of the valve piston.
  • the coupler gap volume is limited by an inner end wall of the coupler piston, an end face of the guide piston of the coupler body and an annular surface of the sleeve-shaped guide portion of the valve piston. Furthermore, the coupler piston have a collar pointing radially outwards and the coupler body has a further collar pointing radially outwards, against which the pretensioning spring acts in each case under pretensioning.
  • coupler unit 10 of a fuel injector has a fixedly connected to a housing part 11 of the fuel injector coupler body 12, a cup-shaped coupler piston 13 and a valve piston 14.
  • the coupler unit 10 further comprises radially outside of the coupler piston 13, a biasing spring 15, which with the lower end in the drawing plane on a collar 17 of the coupler body 12 and with the opposite, in the drawing plane upper end to another, formed on the coupler piston 13 collar 18th supported, between the further collar 18 and the biasing spring 15, a shim 20 is arranged.
  • the biasing spring 15 presses the Kopperkolben 13 via a transmission element, not shown, against an actuator unit, also not shown.
  • the biasing spring 15 thereby provides on the one hand for a bias of the coupler piston 13 against the actuator unit and on the other hand provides indirectly for a necessary for the functioning of the controlled by a piezoelectric actuator unit injection system bias of the piezoelectric actuator unit.
  • the coupler body 12 connected to the housing part 11 has a guide cylinder 21 with the diameter d3 arranged in the center of the coupler unit 10 and a support part 22 with the collar 17, with which the coupler body 12 rests on the housing part 11.
  • the valve piston 14 On the guide cylinder 21 of the coupler body 12, the valve piston 14 is guided at the diameter d3 with a sleeve-shaped portion 23, wherein the sleeve-shaped portion has an outer diameter d1.
  • the valve piston 14 also has a pressure section 24, which presses against a valve pin 25 of a valve element, not shown, which controls a control chamber of a nozzle needle of the fuel injector.
  • the pressure section 24 is arranged within a recess 26 which is surrounded by the support part 22 of the coupler body 12.
  • FIG. 1 is within the recess 26 continues to be a compression spring 27th arranged, which is supported on the housing-fixed coupler body 12 and with the opposite end to an annular shoulder 28 which is fixedly connected to the pressure portion 24 of the valve piston 14. By the compression spring 27, the valve piston 14 is pressed onto the valve pin 25.
  • the compression spring 27 is disposed between the coupler piston 13 and valve piston 14, wherein the annular shoulder 28 is formed for supporting the compression spring 27 on the guide portion 23 of the valve piston 14.
  • the pot-shaped coupler piston 13 is designed with a cylindrical peripheral wall 31 and a solid, end-side termination 32 with an end wall 33, wherein the cylindrical peripheral wall 31 forms an inner guide surface 34.
  • the cup-shaped coupler piston 13 is guided with the inner guide surface 34 at the diameter d1 of the sleeve-shaped guide portion 23 of the valve piston 14.
  • a pressure chamber 40 is formed, which limits a Kopplerspaltvolumen.
  • the effective translation surface for the coupler unit with the annular surface 36 is thus ⁇ / 4 (d1 2 - d3 2 ).
  • valve piston 14 of the present coupler unit 10 The peculiarity of the valve piston 14 of the present coupler unit 10 is that the valve piston 14 is located with a part above the housing-fixed support member 22 and with a second part below the housing-fixed support member 22 of the coupler body 12.
  • the acting on the two sides of the coupler body 12 parts of the Ventikolbens 14 require that either the coupler body 12 is composed of at least two components or the valve piston 14 of at least two components.
  • FIGS. 3 and 4 show an embodiment with a multi-part coupler body 12, this embodiment in the embodiment in FIG. 1 was used.
  • the coupler body 12 in this case has an inner punch 41, a transverse strut 42 and a support ring 43, wherein the inner punch 41 the guide cylinder 21 and the cross member 42 and the support ring 43, the support member 22 form.
  • the inner punch 41 is designed with a transverse bore 44 for receiving the transverse strut 42.
  • the valve piston 14 has at the same height a further transverse bore 45. For assembly of valve piston 14 and coupler body 12, the inner punch 41 is first introduced into the inner bore of the valve piston 14.
  • the cross member 42 is pushed through the transverse bores 44, 45 of the valve piston 14 and inner punch 41 and firmly connected to the inner punch 41.
  • This can be z. B. carried out by performing a press fit between the inner punch 41 and cross member 42, or by friction welding, by locking or by gluing.
  • the transverse strut 42 is received with an axial clearance 49, so that the valve piston 14 can later freely perform an axial movement.
  • the crossbar 42 is finally connected to the support ring 43, for example by welding. This ensures that in the assembled state of the multi-part coupler body 12 above the housing-fixed support member 22 of the sleeve-shaped portion 23 of the valve piston 14 and below the housing-fixed support member 22 of the pressure portion 24 of the valve piston 14 is located.
  • FIG. 5 shows an embodiment with a one-piece coupler body 12 and a multi-part valve piston 14, this embodiment in the embodiment in FIG. 2 was used.
  • the coupler body 12 is designed substantially rotationally symmetrical, wherein the guide cylinder 21, a plate-shaped disc 51 is formed, which merges in the outer region in a cylindrical support ring 53.
  • the disk 51 and the support ring 53 form the support part 22.
  • a detailed illustration of the coupler body 12 in FIG. 5 goes out of the FIGS. 6 and 7 out.
  • the plate-shaped disk 51 has a plurality of, in the present embodiment, six openings 52 through which, as will be described later, the valve piston 14 is passed.
  • the valve piston 14 consists of an upper part 55 and a lower part 56.
  • the upper part 55 is formed by the sleeve-shaped guide section 23, which is designed with coupling pin 57 at the end remote from the coupler gap.
  • the coupling pin 57 pass through the openings 52, as in FIG. 8 is shown.
  • the lower part 56 of the valve piston 14 has a closed end face 58, which projects on a lower side 59 of the dish-shaped disk 51 Coupling pin 57 of the upper part 55 abuts ( FIG. 5 ). It is important that the valve force, which is responsible for the refilling of the coupler gap acts on the upper part 55 of the valve piston 14 and the lower part 56 of the valve piston 14 presses in the idle state of the coupler unit 10 against the valve pin 25 of the control valve, not shown.
  • the preparation of the coupling pin 57 of the upper part 55 of the valve piston 14 is by means of FIG. 9 explained.
  • three grooves 61 are introduced into the lower ring surface of the upper part 55 of the valve piston 14 in the drawing plane in order to produce the six coupling pins 57.
  • the depth of the grooves 61 is designed so that the groove base is positioned with mounted coupler unit 10 above the plate-shaped disc 51 of the coupler body 12 in order to realize the required axial clearance 49.
  • the upper part 55 of the valve piston 14 has a depression 60 into which the lower part 56 of the valve piston 14 is received.
  • a radial guidance of the lower part 56 on the upper part 55 of the valve piston 14 is achieved.
  • a radial clearance between the outer diameter of the lower part 56 and the recess 60 may be provided.
  • the two diameters can also be designed so that an interference fit between the recess 60 and the lower part 56 of the valve piston 14 results, so that the upper part 55 and the lower part 56 of the valve piston 14 are joined during assembly of the two-part valve piston 14 by pressing. In the latter case, however, the coupler unit is no longer removable.
  • the radial guidance of the upper part 55 and the lower part 56 of the valve piston 14 to each other also be done in a different way.
  • a covenant on the upper end face of the lower part 56 of the valve piston 14, which includes the upper part 55 called.
  • a pin with a diameter on the upper end face of the lower part 56 of the Valve piston 14 is arranged, which is slightly smaller than the diameter d3, wherein the pin projects into the inner bore of the upper part 55 of the valve piston 14.

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

Description

Die Erfindung betrifft einen Kraftstoffinjektor mit einer hydraulischen Kopplereinheit nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injector with a hydraulic coupler unit according to the preamble of claim 1.

Stand der TechnikState of the art

Aus DE 103 22 672 A1 ist ein Kraftstoffinjektor bekannt, bei welchem in einem In-jektorgehäuse unter anderem eine hydraulische Kopplereinheit angeordnet ist. Die hydraulische Kopplereinheit umfasst einen Kopplerkörper, in welchem ein Kopplerkolben und ein Ventilkolben jeweils axial verschiebbar geführt sind, wobei beide Bauteile zwischen sich einen mit Kraftstoff gefüllten Druckraum definieren, welcher ein sogenanntes Kopplerspaltvolumen bildet. Der Kopplerkolben steht dabei mit einem Aktorelement in Verbindung, dessen Betätigung eine translatorische Bewegung des Kopplerkolbens in Richtung des Druckraums entgegen einer Vorspannfeder hervorruft, die koaxial außerhalb des Kopplerkörpers angeordnet ist und zum Einen eine Rückstellbewegung des Kopplerkolbens nach erfolgter Betätigung und zum Anderen eine nötige Vorspannung der Aktoreinheit gewährleistet. Die Baulänge der hydraulischen Kopplereinheit wird im Wesentlichen durch die Summe der Längen von Ventilkolben und Kopplerkolben bestimmt, d. h. aus den Längen der im Kopplerkörper geführten Kolben. Weiterhin tritt bei Druckbeaufschlagung des Kopplerspaltes eine Aufweitung des Führungsspiels bzw. des Führungsspaltes sowohl am Kopplerkolben als auch am Ventilkolben auf.Out DE 103 22 672 A1 For example, a fuel injector is known in which, inter alia, a hydraulic coupler unit is arranged in an injector housing. The hydraulic coupler unit comprises a coupler body, in which a coupler piston and a valve piston are each guided axially displaceably, wherein both components define between them a fuel space filled with fuel, which forms a so-called coupler gap volume. The coupler piston is in communication with an actuator element whose operation causes a translational movement of the coupler piston in the direction of the pressure chamber against a biasing spring, which is arranged coaxially outside the coupler body and on the one hand a return movement of the coupler piston after the operation and on the other a necessary bias Actuator ensured. The overall length of the hydraulic coupler unit is essentially determined by the sum of the lengths of the valve piston and the coupler piston, ie from the lengths of the pistons guided in the coupler body. Furthermore, upon pressurization of the coupler gap, a widening of the guide clearance or of the guide gap occurs both on the coupler piston and on the valve piston.

In der DE-Patentanmeldung 102010003405.3 nicht vorveröffentlicht wurde bereits eine Kopplereinheit vorgeschlagen, bei der der Kopplerkörper, der Kopplerkolben und der Ventilkolben radial ineinander angeordnet sind, indem der Kopplerkörper hülsenförmig ausgebildet ist und an der Außenumfangsfläche der Kopplerkolben und an der Innenumfangsfläche der Ventilkolben axial beweglich geführt sind. Dadurch befinden sich die funktionalen Bauteile der Kopplereinheit axial im Wesentlichen auf gleicher Höhe, wodurch sich die Baulänge der Kopplereinheit reduzieren lässt. Nachteilig bei dieser technischen Lösung ist, dass der hülsenförmige Teil des Kopplergehäuses zwischen Kopplerkolben und Ventilkolben bei den im Kraftstoffinjektor erforderlichen Übersetzungsverhältnissen eine sehr geringe Wandstärke von unter 1 mm aufweist, wobei gleichzeitig die Anforderung besteht, den Kopplerkolben an dessen Mantelfläche und den Ventilkolben an dessen Innenbohrung mit geringem Spiel zu führen. Dies stellt erhöhte Anforderungen an die Fertigungstechnik bei der Herstellung der Kopplereinheit.In the DE patent application 102010003405.3 not prepublished has already been proposed a coupler unit in which the coupler body, the coupler piston and the valve piston are arranged radially in one another, by the coupler body sleeve-shaped is formed and axially movably guided on the outer peripheral surface of the coupler piston and on the inner peripheral surface of the valve piston. As a result, the functional components of the coupler unit are axially substantially at the same height, which reduces the overall length of the coupler unit. A disadvantage of this technical solution is that the sleeve-shaped part of the coupler between coupler piston and valve piston at the required in the fuel injector ratios a very small wall thickness of less than 1 mm, which at the same time there is a requirement, the coupler piston on the lateral surface and the valve piston on the inner bore to lead with little play. This places increased demands on the production technology in the production of the coupler unit.

Eine gattungsgemäße Kopplereinheit ist aus der DE-A-10145620 bekannt.A generic coupler unit is from the DE-A-10145620 known.

Aufgabe der vorliegenden Erfindung ist es, eine Kopplereinheit zu schaffen, die einerseits die gleichen funktionalen Vorteile aufweist, aber andererseits die Ausführung der Bauteile mit größeren Wandstärken ermöglicht, um dadurch die Anforderungen an die Fertigungstechnik zur Führungen von Ventilkolben und Kopplerkolben zu reduzieren.Object of the present invention is to provide a coupler unit, on the one hand has the same functional advantages, but on the other hand allows the execution of the components with larger wall thicknesses, thereby reducing the demands on the manufacturing technology for guiding the valve piston and coupler piston.

Offenbarung der ErfindungDisclosure of the invention

Die Aufgabe der Erfindung wird mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Der wesentliche Vorteil der erfindungsgemäßen Kopplereinheit besteht darin, dass keine hochgenauen Führungen an dünnwandigen Hülsen erforderlich sind, so dass an die Fertigungstechnik keine erhöhten Anforderrungen gestellt werden müssen.The object of the invention is achieved with the characterizing features of claim 1. The main advantage of the coupler unit according to the invention is that no high-precision guides on thin-walled sleeves are required, so that no increased requirements have to be made of the production technology.

Der Kern der Erfindung besteht darin, dass die radiale Anordnung von Kopplerkörper und Ventilkolben eine Art Kommutierung erfährt, indem der Ventilkolben einen hülsenförmigen Führungsabschnitt aufweist und in der Innenbohrung des hülsenförmigen Führungsabschnitts ein gehäusefest angeordneter Führungskolben des Kopplerkörpers angeordnet ist, an dem der hülsenförmige Führungsabschnitt axial geführt ist. Der hülsenförmige Ventilkolben weist somit eine ringförmigen Stirnfläche mit einem Außendurchmesser d 1 und einem Innendurchmesser d3 aus. Dadurch bleibt die Querschnittsfläche des Ventilkolbens, die dem Kopplerspaltvolumen ausgesetzt ist, unverändert.The essence of the invention is that the radial arrangement of coupler body and valve piston undergoes a kind of commutation by the valve piston has a sleeve-shaped guide portion and in the inner bore of the sleeve-shaped guide portion a housing fixedly arranged guide piston of the coupler body is arranged, on which the sleeve-shaped guide section axially is. The sleeve-shaped valve piston thus has an annular end surface with an outer diameter d 1 and an inner diameter d3. As a result, the cross-sectional area of the valve piston which is exposed to the Kopplerspaltvolumen remains unchanged.

Die reduzierte Baulänge der Kopplereinheit wird insbesondere dadurch erreicht, indem an einer äußeren Umfangsfläche des hülsenförmigen Führungsabschnitts des Ventilkolbens der Kopplerkolben mit dem Durchmesser d1 axial verschiebbar geführt ist. Bei dem in Krafstoffinjektoren üblichen Übersetzungsverhältnissen von mehr als 1, jedoch deutlich unter 2, ergibt sich durch die erfindungsgemäße Anordnung der Bauteile der Kopplereinheit eine deutlich höhere Wandstärke (d1 - d3)/2 des hülsenförmigen Ventilkolbens als dies bei einer gehäusefest angeordneten Hülse der Fall wäre. Der hülsenförmige Ventilkolben der erfindungsgemäßen Kopplereinheit weist damit die weitaus höhere, nämlich bis zur dreifachen Wandstärke auf.The reduced overall length of the coupler unit is achieved, in particular, by the coupler piston with the diameter d1 being guided axially displaceably on an outer peripheral surface of the sleeve-shaped guide section of the valve piston. In the customary in Krafstoffinjektoren gear ratios of more than 1, but well below 2, results from the inventive arrangement of the components of the coupler unit a significantly higher wall thickness (d1 - d3) / 2 of the tubular valve piston than would be the case with a sleeve fixed to the housing , The sleeve-shaped valve piston of the coupler unit according to the invention thus has the much higher, namely up to three times the wall thickness.

Weiterbildungen der Erfindung sind durch die Maßnahmen der Unteransprüche möglich.Further developments of the invention are possible by the measures of the subclaims.

Die Realisierung der erfindungsgemäßen Kopplereinheit erfordert, dass entweder Kopplerkörper oder Ventilkolben aus mindestens zwei Einzelbauteilen auszubilden sind, weil bei einer jeweils einstückigen Ausführung beider Bauteile der Ventilkolben nicht über den Führungskolben des Kopplerkörpers geschoben werden kann.The realization of the coupler unit according to the invention requires that either coupler body or valve piston are to be formed from at least two individual components, because in a respective one-piece design of both components of the valve piston can not be pushed over the guide piston of the coupler body.

Dazu weist der hülsenförmige Führungsabschnitt eine äußere Umfangsfläche auf, an der der Kopplerkolben mit einer inneren Führungsfläche axial verschiebbar geführt ist. Weiterhin weist der Kopplerkörper einen Stützabschnitt auf, welcher sich an einem gehäusefesten Bauteil abstützt, wobei der Ventilkolben mit dem hülsenförmige Führungsabschnitt auf der einen Seite des Stützabschnitts und mit einem Druckabschnitt auf der anderen Seite des Stützabschnitts ausgebildet ist.For this purpose, the sleeve-shaped guide portion on an outer peripheral surface on which the coupler piston is guided axially displaceably with an inner guide surface. Furthermore, the coupler body has a support portion, which is supported on a housing-fixed component, wherein the valve piston is formed with the sleeve-shaped guide portion on one side of the support portion and with a pressure portion on the other side of the support portion.

Gemäß einer ersten Alternative ist der Kopperkörper mehrteilig ausgeführt, wobei ein Teil den Führungskolben und ein mindestens weiteres Teil den Stützabschnitt bildet. Ausgeführt wird diese Alternative beispielsweise indem der Stützabschnitt von einem Quersteg und einem Stützring ausgeführt ist, wobei der Quersteg den Ventilkolben mit einem axialen Spiel durchgreift.According to a first alternative, the head body is made in several parts, with one part forming the guide piston and at least one further part forming the support section. This alternative is carried out, for example, by the support section being designed by a transverse web and a support ring, wherein the crosspiece engages through the valve piston with an axial play.

Gemäß einer zweiten Alternative ist der Ventilkolben mehrteilig mit mindestens einem Oberteil und mindestens einem Unterteil ausgeführt, wobei das Oberteil vom hülsenförmigen Führungsabschnitt und das Unterteil vom Druckabschnitt gebildet ist. Zum Zusammenwirken von Oberteil und Unterteil sind zwischen Oberteil und Unterteil Kopplungszapfen ausgebildet, welche den Stützabschnitt des Kopplerkörpers durchgreifen. Dazu ist der Stützabschnitt mit einer tellerförmigen Scheibe ausgeführt, in der Durchbrüche ausgebildet sind, durch die die Kopplungszapfen greifen. Die Kopplungszapfen können am hülsenförmigen Führungsabschnitt und/oder am Druckabschnitt des Ventilkolbens angeordnet sein.According to a second alternative, the valve piston is designed in several parts with at least one upper part and at least one lower part, the upper part being formed by the sleeve-shaped guide section and the lower part by the pressure section. For cooperation of upper part and lower part coupling pin are formed between upper part and lower part, which pass through the support portion of the coupler body. For this purpose, the support portion is designed with a plate-shaped disc, are formed in the apertures through which engage the coupling pin. The coupling pins can be arranged on the sleeve-shaped guide section and / or on the pressure section of the valve piston.

Das Kopplerspaltvolumen wird von einer inneren Stirnwand des Kopplerkolbens, einer Stirnfläche des Führungskolbens des Kopplerkörpers und einer Ringfläche des hülsenförmigen Führungsabschnitts des Ventilkolbens begrenzt. Weiterhin weisen der Kopplerkolben einen radial nach außen weisenden Bund und der Kopplerkörper einen weiteren radial nach außen weisenden Bund auf, an denen jeweils die Vorspannfeder unter Vorspannung angreift.The coupler gap volume is limited by an inner end wall of the coupler piston, an end face of the guide piston of the coupler body and an annular surface of the sleeve-shaped guide portion of the valve piston. Furthermore, the coupler piston have a collar pointing radially outwards and the coupler body has a further collar pointing radially outwards, against which the pretensioning spring acts in each case under pretensioning.

Ausführungsbeispielembodiment

Zwei Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert.Two embodiments of the invention are illustrated in the drawing and explained in more detail in the following description.

Es zeigen:

Figur 1
eine Schnittdarstellung durch eine erste Ausführungsform der erfindungsgemäßen Kopplereinheit,
Figur 2
eine Schnittdarstellung durch eine zweite Ausführungsform der erfindungsgemäßen Kopplereinheit,
Figur 3
eine Schnittdarstellung durch einen Kopplerkörper und einen Ventilkolben gemäß einer ersten Ausführungsform,
Figur 4
eine Schnittdarstellung nach Linie IV - IV in Figur 3,
Figur 5
eine Schnittdarstellung durch einen Kopplerkörper und einen Ventilkolben gemäß einer zweiten Ausführungsform,
Figur 6
eine Seitenansicht des Kopplerkörpers in Figur 5,
Figur 7
eine Ansicht A des Kopplerkörpers in Figur 6,
Figur 8
eine Schnittdarstellung durch den Ventilkolben nach Linie VIII - VIII in Figur 5 und
Figur 9
eine Schnittdarstellung durch den Ventilkolben nach Linie VIII - VIII ohne Kopplerkörper in Figur 5.
Show it:
FIG. 1
a sectional view through a first embodiment of the coupler unit according to the invention,
FIG. 2
a sectional view through a second embodiment of the coupler unit according to the invention,
FIG. 3
a sectional view through a coupler body and a valve piston according to a first embodiment,
FIG. 4
a sectional view along line IV - IV in FIG. 3 .
FIG. 5
a sectional view through a coupler body and a valve piston according to a second embodiment,
FIG. 6
a side view of the coupler body in FIG. 5 .
FIG. 7
a view A of the coupler body in FIG. 6 .
FIG. 8
a sectional view through the valve piston according to line VIII - VIII in FIG. 5 and
FIG. 9
a sectional view through the valve piston according to line VIII - VIII without coupler body in FIG. 5 ,

Die in Figur 1 und 2 dargestellte Kopplereinheit 10 eines Kraftstoffinjektors weist einen fest mit einem Gehäuseteil 11 des Kraftstoffinjektors verbundenen Kopplerkörper 12, einen topfförmigen Kopplerkolben 13 und einen Ventilkolben 14 auf. Die Kopplereinheit 10 weist weiterhin radial außerhalb des Kopplerkolbens 13 eine Vorspannfeder 15 auf, welche mit dem in der Zeichnungsebene unteren Ende an einem Bund 17 des Kopplerkörpers 12 und mit dem gegenüberliegenden, in der Zeichnungsebene oberen Ende an einem weiteren, am Kopplerkolben 13 ausgebildeten Bund 18 abstützt, wobei zwischen dem weiteren Bund 18 und der Vorspannfeder 15 eine Einstellscheibe 20 angeordnet ist. Die Vorspannfeder 15 drückt den Kopperkolben 13 über ein nicht dargestelltes Übertragungselement gegen eine ebenfalls nicht dargestellte Aktoreinheit. Die Vorspannfeder 15 sorgt dadurch zum Einen für eine Vorspannung des Kopplerkolbens 13 gegen die Aktoreinheit und sorgt zum Anderen mittelbar für eine für die Funktionsfähigkeit des mittels eines piezoelektrischen Aktoreinheit angesteuerten Einspritzsystems notwendigen Vorspannung der piezoelektrischen Aktoreinheit.In the FIG. 1 and 2 shown coupler unit 10 of a fuel injector has a fixedly connected to a housing part 11 of the fuel injector coupler body 12, a cup-shaped coupler piston 13 and a valve piston 14. The coupler unit 10 further comprises radially outside of the coupler piston 13, a biasing spring 15, which with the lower end in the drawing plane on a collar 17 of the coupler body 12 and with the opposite, in the drawing plane upper end to another, formed on the coupler piston 13 collar 18th supported, between the further collar 18 and the biasing spring 15, a shim 20 is arranged. The biasing spring 15 presses the Kopperkolben 13 via a transmission element, not shown, against an actuator unit, also not shown. The biasing spring 15 thereby provides on the one hand for a bias of the coupler piston 13 against the actuator unit and on the other hand provides indirectly for a necessary for the functioning of the controlled by a piezoelectric actuator unit injection system bias of the piezoelectric actuator unit.

Der mit dem Gehäuseteil 11 verbundene Kopplerkörper 12 weist einen im Zentrum der Kopplereinheit 10 angeordneten Führungszylinder 21 mit dem Durchmesser d3 und ein Abstützteil 22 mit dem Bund 17 auf, mit dem der Kopplerkörper 12 am Gehäuseteil 11 aufliegt. Am Führungszylinder 21 des Kopplerkörpers 12 ist am Durchmesser d3 der Ventilkolben 14 mit einem hülsenförmigen Abschnitt 23 geführt, wobei der hülsenförmige Abschnitt einen Außendurchmesser d1 aufweist.The coupler body 12 connected to the housing part 11 has a guide cylinder 21 with the diameter d3 arranged in the center of the coupler unit 10 and a support part 22 with the collar 17, with which the coupler body 12 rests on the housing part 11. On the guide cylinder 21 of the coupler body 12, the valve piston 14 is guided at the diameter d3 with a sleeve-shaped portion 23, wherein the sleeve-shaped portion has an outer diameter d1.

Der Ventilkolben 14 weist weiterhin einen Druckabschnitt 24 auf, welcher gegen einen Ventilbolzen 25 eines nicht näher dargestellten Ventilelements drückt, das einen Steuerraum einer Düsennadel des Kraftstofffinjektors ansteuert. Der Druckabschnitt 24 ist dabei innerhalb einer Ausnehmung 26 angeordnet, die vom Abstützteil 22 des Kopplerkörpers 12 umgeben ist. Beim Ausführungsbeispiel gemäß Figur 1 ist innerhalb der Ausnehmung 26 weiterhin eine Druckfeder 27 angeordnet, die sich am gehäusefesten Kopplerkörper 12 und mit dem gegenüberliegenden Ende an einer Ringschulter 28 abstützt, welche mit dem Druckabschnitt 24 des Ventilkolbens 14 fest verbunden ist. Durch die Druckfeder 27 wird der Ventilkolben 14 auf den Ventilbolzen 25 gedrückt.The valve piston 14 also has a pressure section 24, which presses against a valve pin 25 of a valve element, not shown, which controls a control chamber of a nozzle needle of the fuel injector. The pressure section 24 is arranged within a recess 26 which is surrounded by the support part 22 of the coupler body 12. According to the embodiment FIG. 1 is within the recess 26 continues to be a compression spring 27th arranged, which is supported on the housing-fixed coupler body 12 and with the opposite end to an annular shoulder 28 which is fixedly connected to the pressure portion 24 of the valve piston 14. By the compression spring 27, the valve piston 14 is pressed onto the valve pin 25.

Beim Ausführungsbeispiel in Figur 2 ist die Druckfeder 27 zwischen Kopplerkolben 13 und Ventilkolben 14 angeordnet, wobei die Ringschulter 28 zum Abstützen der Druckfeder 27 am Führungsabschnitt 23 des Ventilkolbens 14 ausgebildet ist.In the embodiment in FIG. 2 the compression spring 27 is disposed between the coupler piston 13 and valve piston 14, wherein the annular shoulder 28 is formed for supporting the compression spring 27 on the guide portion 23 of the valve piston 14.

Der topfförmige Kopplerkolben 13 ist mit einer zylindrischen Umfangswand 31 und einem massiven, stirnseitigen Abschluss 32 mit einer Stirnwand 33 ausgeführt, wobei die zylindrische Umfangswand 31 eine innere Führungsfläche 34 ausbildet. Der topfförmige Kopplerkolben 13 ist mit der inneren Führungsfläche 34 am Durchmesser d1 des hülsenförmigen Führungsabschnitts 23 des Ventilkolbens 14 geführt.The pot-shaped coupler piston 13 is designed with a cylindrical peripheral wall 31 and a solid, end-side termination 32 with an end wall 33, wherein the cylindrical peripheral wall 31 forms an inner guide surface 34. The cup-shaped coupler piston 13 is guided with the inner guide surface 34 at the diameter d1 of the sleeve-shaped guide portion 23 of the valve piston 14.

Zwischen der inneren Stirnwand 33, einer Stirnfläche 35 des Führungszylinders 21 und einer Ringfläche 36 des hülsenförmigen Führungsabschnitts 23 ist ein Druckraum 40 ausgebildet, der ein Kopplerspaltvolumen begrenzt. Die wirksame Übersetzungsfläche für die Kopplereinheit mit der Ringfläche 36 beträgt somit Π/4(d12 - d32).Between the inner end wall 33, an end face 35 of the guide cylinder 21 and an annular surface 36 of the sleeve-shaped guide portion 23, a pressure chamber 40 is formed, which limits a Kopplerspaltvolumen. The effective translation surface for the coupler unit with the annular surface 36 is thus Π / 4 (d1 2 - d3 2 ).

Die Besonderheit des Ventilkolbens 14 der vorliegenden Kopplereinheit 10 besteht darin, dass der Ventilkolben 14 mit einem Teil oberhalb des gehäusefesten Abstützteils 22 und mit einem zweiten Teil unterhalb des gehäusefesten Abstützteils 22 des Kopplerkörpers 12 liegt. Die an den zwei Seiten des Kopplerkörpers 12 wirkenden Teile des Ventikolbens 14 erfordern, dass entweder der Kopplerkörper 12 aus mindestens zwei Bauteilen oder der Ventilkolben 14 aus mindestens zwei Bauteilen zusammengesetzt wird.The peculiarity of the valve piston 14 of the present coupler unit 10 is that the valve piston 14 is located with a part above the housing-fixed support member 22 and with a second part below the housing-fixed support member 22 of the coupler body 12. The acting on the two sides of the coupler body 12 parts of the Ventikolbens 14 require that either the coupler body 12 is composed of at least two components or the valve piston 14 of at least two components.

Die Figuren 3 und 4 zeigen eine Ausführungsform mit einem mehrteiligen Kopplerkörper 12, wobei diese Ausführungsform beim Ausführungsbeispiel in Figur 1 eingesetzt wurde. Der Kopplerkörper 12 weist dabei einen Innenstempel 41, eine Querstrebe 42 und einen Stützring 43 auf, wobei der Innenstempel 41 den Führungszylinder 21 sowie die Querstrebe 42 und der Stützring 43 das Abstützteil 22 bilden. Der Innenstempel 41 ist dabei mit einer Querbohrung 44 zur Aufnahme der Querstrebe 42 ausgeführt. Der Ventilkolben 14 weist auf gleicher Höhe eine weitere Querbohrung 45 auf. Zur Montage von Ventilkolben 14 und Kopplerkörper 12 wird zunächst der Innenstempel 41 in die Innenbohrung des Ventilkolbens 14 eingebracht. Anschließend wird die Querstrebe 42 durch die Querbohrungen 44, 45 von Ventilkolben 14 und Innenstempel 41 geschoben und fest mit dem Innenstempel 41 verbunden. Dies kann z. B. durch Ausführung einer Presspassung zwischen Innenstempel 41 und Querstrebe 42 erfolgen, oder durch Reibschweißen, durch Verrasten oder durch Kleben. In der weiteren Querbohrung 45 im Ventilkolben 14 ist die Querstrebe 42 mit einem axialen Spiel 49 aufgenommen, so dass der Ventilkolben 14 später ungehindert eine Axialbewegung ausführen kann. Die Querstrebe 42 wird schließlich mit dem Stützring 43, beispielsweise durch Schweißen verbunden. Dadurch ist gewährleistet, dass im fertig montierten Zustand des mehrteiligen Kopplerkörpers 12 oberhalb des gehäusefesten Abstützteils 22 der hülsenförmige Abschnitt 23 des Ventilkolbens 14 und unterhalb des gehäusefesten Abstützteils 22 der Druckabschnitt 24 des Ventilkolbens 14 liegt.The FIGS. 3 and 4 show an embodiment with a multi-part coupler body 12, this embodiment in the embodiment in FIG. 1 was used. The coupler body 12 in this case has an inner punch 41, a transverse strut 42 and a support ring 43, wherein the inner punch 41 the guide cylinder 21 and the cross member 42 and the support ring 43, the support member 22 form. The inner punch 41 is designed with a transverse bore 44 for receiving the transverse strut 42. The valve piston 14 has at the same height a further transverse bore 45. For assembly of valve piston 14 and coupler body 12, the inner punch 41 is first introduced into the inner bore of the valve piston 14. Subsequently, the cross member 42 is pushed through the transverse bores 44, 45 of the valve piston 14 and inner punch 41 and firmly connected to the inner punch 41. This can be z. B. carried out by performing a press fit between the inner punch 41 and cross member 42, or by friction welding, by locking or by gluing. In the further transverse bore 45 in the valve piston 14, the transverse strut 42 is received with an axial clearance 49, so that the valve piston 14 can later freely perform an axial movement. The crossbar 42 is finally connected to the support ring 43, for example by welding. This ensures that in the assembled state of the multi-part coupler body 12 above the housing-fixed support member 22 of the sleeve-shaped portion 23 of the valve piston 14 and below the housing-fixed support member 22 of the pressure portion 24 of the valve piston 14 is located.

Figur 5 zeigt eine Ausführungsform mit einem einteiligen Kopplerkörper 12 und einem mehrteiligen Ventilkolben 14, wobei diese Ausführungsform beim Ausführungsbeispiel in Figur 2 eingesetzt wurde. Der Kopplerkörper 12 ist dabei im Wesentlichen rotationssymmetrisch ausgeführt, wobei am Führungszylinder 21 eine tellerförmige Scheibe 51 angeformt ist, die im äußeren Bereich in einen zylindrischen Stützring 53 übergeht. Die Scheibe 51 und der Stützring 53 bilden das Abstützteil 22. Eine detaillierte Darstellung des Kopplerkörpers 12 in Figur 5 geht aus den Figuren 6 und 7 hervor. Die tellerförmige Scheibe 51 weist mehrere, im vorliegenden Ausführungsbeispiel sechs Durchbrüche 52 auf, durch die, wie später noch beschrieben wird, der Ventilkolben 14 hindurchgeführt wird. Der Ventilkolben 14 besteht aus einem Oberteil 55 und einem Unterteil 56. Das Oberteil 55 wird von dem hülsenförmigen Führungsabschnitt 23 gebildet, der am dem Kopplerspalt abgewandten Ende mit Kopplungszapfen 57 ausgeführt ist. Die Kopplungszapfen 57 durchgreifen die Durchbrüche 52, wie in Figur 8 dargestellt ist. Das Unterteil 56 des Ventilkolbens 14 weist eine geschlossene Stirnfläche 58 auf, die an einer Unterseite 59 der durch die tellerförmige Scheibe 51 ragenden Kopplungszapfen 57 des Oberteils 55 anliegt (Figur 5). Wichtig ist, dass die Ventilkraft, welche für die Wiederbefüllung des Kopplerspaltes verantwortlich ist, am Oberteil 55 des Ventilkolbens 14 angreift und das Unterteil 56 des Ventilkolbens 14 im Ruhezustand der Kopplereinheit 10 gegen den Ventilbolzen 25 des nicht dargestellten Steuerventils drückt. FIG. 5 shows an embodiment with a one-piece coupler body 12 and a multi-part valve piston 14, this embodiment in the embodiment in FIG. 2 was used. The coupler body 12 is designed substantially rotationally symmetrical, wherein the guide cylinder 21, a plate-shaped disc 51 is formed, which merges in the outer region in a cylindrical support ring 53. The disk 51 and the support ring 53 form the support part 22. A detailed illustration of the coupler body 12 in FIG FIG. 5 goes out of the FIGS. 6 and 7 out. The plate-shaped disk 51 has a plurality of, in the present embodiment, six openings 52 through which, as will be described later, the valve piston 14 is passed. The valve piston 14 consists of an upper part 55 and a lower part 56. The upper part 55 is formed by the sleeve-shaped guide section 23, which is designed with coupling pin 57 at the end remote from the coupler gap. The coupling pin 57 pass through the openings 52, as in FIG. 8 is shown. The lower part 56 of the valve piston 14 has a closed end face 58, which projects on a lower side 59 of the dish-shaped disk 51 Coupling pin 57 of the upper part 55 abuts ( FIG. 5 ). It is important that the valve force, which is responsible for the refilling of the coupler gap acts on the upper part 55 of the valve piston 14 and the lower part 56 of the valve piston 14 presses in the idle state of the coupler unit 10 against the valve pin 25 of the control valve, not shown.

Die Herstellung der Kopplungszapfen 57 des Oberteils 55 des Ventilkolbens 14 wird mittels Figur 9 erläutert. Dazu werden in die in der Zeichnungsebene untere Ringfläche des Oberteils 55 des Ventilkolbens 14 zur Erzeugung der sechs Kopplungszapfen 57 drei Nuten 61 eingebracht. Die Tiefe der Nuten 61 ist so ausgeführt, dass der Nutengrund bei montierter Kopplereinheit 10 oberhalb der tellerförmigen Scheibe 51 des Kopplerkörpers 12 positioniert ist, um das erforderliche axiale Spiel 49 zu realisieren.The preparation of the coupling pin 57 of the upper part 55 of the valve piston 14 is by means of FIG. 9 explained. For this purpose, three grooves 61 are introduced into the lower ring surface of the upper part 55 of the valve piston 14 in the drawing plane in order to produce the six coupling pins 57. The depth of the grooves 61 is designed so that the groove base is positioned with mounted coupler unit 10 above the plate-shaped disc 51 of the coupler body 12 in order to realize the required axial clearance 49.

Zur Ausführung eines mehrteiligen Ventilkolbens 14 ist es auch denkbar, statt an der unteren Ringfläche des Oberteils 55 des Ventilkolbens 14 alternativ oder zusätzlich an der oberen Stirnfläche 58 des Unterteils 56 des Ventilkolbens 14 die Kopplungszapfen bzw. zusätzliche Kopplungszapfen auszuführen.For the execution of a multi-part valve piston 14, it is also conceivable, instead of on the lower annular surface of the upper part 55 of the valve piston 14, alternatively or additionally on the upper end face 58 of the lower part 56 of the valve piston 14 to carry out the coupling pin or additional coupling pin.

In Figur 5 weist das Oberteil 55 des Ventilkolbens 14 eine Vertiefung 60 auf, in die das Unterteil 56 des Ventilkolbens 14 aufgenommen ist. Dadurch wird eine radiale Führung des Unterteils 56 am Oberteil 55 des Ventilkolbens 14 erreicht. Dabei kann ein radiales Spiel zwischen dem Außendurchmesser des Unterteils 56 und der Vertiefung 60 vorgesehen sein. Die beiden Durchmesser können aber auch so ausgeführt sein, dass sich eine Presspassung zwischen der Vertiefung 60 und dem Unterteil 56 des Ventilkolbens 14 ergibt, so dass das Oberteil 55 und das Unterteil 56 des Ventilkolbens 14 beim Zusammensetzen des zweiteiligen Ventilkolbens 14 durch Verpressen gefügt werden. Im letzteren Fall ist die Kopplereinheit jedoch nicht mehr demontierbar.In FIG. 5 For example, the upper part 55 of the valve piston 14 has a depression 60 into which the lower part 56 of the valve piston 14 is received. As a result, a radial guidance of the lower part 56 on the upper part 55 of the valve piston 14 is achieved. In this case, a radial clearance between the outer diameter of the lower part 56 and the recess 60 may be provided. However, the two diameters can also be designed so that an interference fit between the recess 60 and the lower part 56 of the valve piston 14 results, so that the upper part 55 and the lower part 56 of the valve piston 14 are joined during assembly of the two-part valve piston 14 by pressing. In the latter case, however, the coupler unit is no longer removable.

Alternativ kann die radiale Führung vom Oberteil 55 und vom Unterteil 56 des Ventilkolbens 14 zueinander auch auf andere Art erfolgen. Beispielsweise seien hier ein Bund an der oberen Stirnseite des Unterteils 56 des Ventilkolbens 14, welcher das Oberteil 55 umfasst, genannt. Weiterhin ist es denkbar, dass ein Zapfen mit einem Durchmesser on der oberen Stirnfläche des Unterteils 56 des Ventilkolbens 14 angeordnet ist, welcher etwas kleiner ist als der Durchmesse d3, wobei der Zapfen in die Innenbohrung des Oberteils 55 des Ventilkolbens 14 hineinragt.Alternatively, the radial guidance of the upper part 55 and the lower part 56 of the valve piston 14 to each other also be done in a different way. For example, here a covenant on the upper end face of the lower part 56 of the valve piston 14, which includes the upper part 55, called. Furthermore, it is conceivable that a pin with a diameter on the upper end face of the lower part 56 of the Valve piston 14 is arranged, which is slightly smaller than the diameter d3, wherein the pin projects into the inner bore of the upper part 55 of the valve piston 14.

Claims (10)

  1. Fuel injector having a hydraulic coupler unit (10), which comprises a coupler body (12), a coupler piston (13) and a valve piston (14), wherein the coupler piston (13) and the valve piston (14) are guided in axially displaceable fashion relative to the coupler body (12) and define between them a pressure chamber (40), as a coupler gap volume, which is delimited in a radial direction by the coupler body and which is filled with fuel and which serves the purpose of converting an axial movement of the coupler piston (13) into an axial movement of the valve piston (14) in accordance with a diameter ratio of valve piston (14) with respect to coupler piston (13), wherein the coupler piston (13) is preloaded outwardly from the coupler gap volume against an actuator element by means of a preload spring, and wherein the coupler piston (13) has a pot-shaped recess in which the coupler piston (12) and the valve piston (14) are at least partially received, characterized in that the valve piston (14) has a sleeve-shaped guide section (23) which is guided on a guide piston (21), said guide piston being formed by the coupler body (12) and being arranged in the centre of the coupler unit (10).
  2. Fuel injector according to Claim 1, characterized in that the sleeve-shaped guide section (23) has an external circumferential surface on which the coupler piston (13) is guided in axially displaceable fashion by way of an internal guide surface (34).
  3. Fuel injector according to Claim 1, characterized in that the coupler body (12) furthermore has a support section (22) which is supported on a component (11) fixed with respect to a housing, and in that the valve piston (14) extends on one side of the support section (22) by way of the sleeve-shaped guide section (23) and on the other side of the support section (22) by way of a thrust section (24).
  4. Fuel injector according to Claim 3, characterized in that the coupler body (12) is of multi-part form, wherein one part forms the guide piston (21) and an at least further part forms the support section (22).
  5. Fuel injector according to Claim 4, characterized in that the support section (22) is formed by a transverse web (42) and a support ring (43), wherein the transverse web (42) extends through the valve piston (14) with an axial clearance (49).
  6. Fuel injector according to Claim 3, characterized in that the valve piston (14) is of multi-part form with at least one upper part (55) and at least one lower part (56), and in that the upper part (55) is formed by the sleeve-shaped guide section (23) and the lower part is formed by a thrust section (24).
  7. Fuel injector according to Claim 6, characterized in that, between the upper part (55) and lower part (56), there are formed coupling pegs (57) which extend through the support section (22) of the coupler body (12).
  8. Fuel injector according to Claim 7, characterized in that the support section (22) is formed with a plate-shaped disk (51) in which there are formed apertures (52) through which the coupling pegs (57) extend.
  9. Fuel injector according to Claim 7 or 8, characterized in that the coupling pegs (57) are formed on the sleeve-shaped guide section (23) and/or on the thrust section (24) of the valve piston (14).
  10. Fuel injector according to Claim 1, characterized in that the coupler gap volume is delimited by an internal face wall of the coupler piston (13), by a face surface of the guide piston (41) of the coupler body (12) and by an annular surface of the sleeve-shaped guide section (23) of the valve piston (14).
EP11724414.5A 2010-07-19 2011-06-06 Fuel injector having a hydraulic coupler unit Not-in-force EP2596231B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010031497 DE102010031497A1 (en) 2010-07-19 2010-07-19 Fuel injector with hydraulic coupler unit
PCT/EP2011/059283 WO2012010368A1 (en) 2010-07-19 2011-06-06 Fuel injector having a hydraulic coupler unit

Publications (2)

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EP2596231A1 EP2596231A1 (en) 2013-05-29
EP2596231B1 true EP2596231B1 (en) 2014-11-12

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EP11724414.5A Not-in-force EP2596231B1 (en) 2010-07-19 2011-06-06 Fuel injector having a hydraulic coupler unit

Country Status (4)

Country Link
EP (1) EP2596231B1 (en)
CN (1) CN103003559B (en)
DE (1) DE102010031497A1 (en)
WO (1) WO2012010368A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102014226673A1 (en) * 2014-12-19 2016-06-23 Robert Bosch Gmbh Hydraulic coupler unit for controlling a valve

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200231A (en) * 1978-06-19 1980-04-29 General Motors Corporation Fuel injector nozzle
DE19940300A1 (en) * 1999-08-25 2001-03-01 Bosch Gmbh Robert Control valve for an injector
DE10032517A1 (en) * 2000-07-05 2002-01-24 Bosch Gmbh Robert Injector for injecting fuel into combustion chambers of internal combustion engines comprises a control part loaded by spring elements in the injector housing and guided in a guide sleeve surrounding a control space
DE10145620B4 (en) * 2001-09-15 2006-03-02 Robert Bosch Gmbh Valve for controlling fluids
DE10322672A1 (en) 2003-05-20 2004-12-09 Robert Bosch Gmbh Valve for controlling liquids
JP2007515604A (en) * 2003-12-05 2007-06-14 シーメンス　アクチエンゲゼルシヤフト Apparatus, method for manufacturing the apparatus, chamber apparatus and transmission apparatus
DE102004005456A1 (en) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Fuel injector with direct-acting injection valve member
JP4131251B2 (en) * 2004-05-13 2008-08-13 株式会社デンソー Fuel injection device
DE102006050163A1 (en) * 2006-10-25 2008-04-30 Robert Bosch Gmbh Injector i.e. common rail injector, for injecting fuel into combustion chamber of internal combustion engine, has spring pressing piston on seat and casing on surface, where piston diameter in casing corresponds to piston diameter at seat
DE102007044361A1 (en) * 2007-09-17 2009-03-19 Robert Bosch Gmbh Control valve for a fuel injector

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CN103003559B (en) 2016-05-11
CN103003559A (en) 2013-03-27
WO2012010368A1 (en) 2012-01-26
DE102010031497A1 (en) 2012-01-19
EP2596231A1 (en) 2013-05-29

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