EP1070201B1 - Injector comprising a piezo multilayer actuator for injection systems - Google Patents
Injector comprising a piezo multilayer actuator for injection systems Download PDFInfo
- Publication number
- EP1070201B1 EP1070201B1 EP00907452A EP00907452A EP1070201B1 EP 1070201 B1 EP1070201 B1 EP 1070201B1 EP 00907452 A EP00907452 A EP 00907452A EP 00907452 A EP00907452 A EP 00907452A EP 1070201 B1 EP1070201 B1 EP 1070201B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- actuator
- bore
- prestressing
- cross
- 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
Links
- 238000002347 injection Methods 0.000 title claims abstract description 7
- 239000007924 injection Substances 0.000 title claims abstract description 7
- 230000003628 erosive effect Effects 0.000 claims 1
- 230000036316 preload Effects 0.000 description 6
- 238000005553 drilling Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
Images
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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
Definitions
- the invention is based on an injector with a piezo multilayer actuator for injection systems, especially one Injector used in "Common Rail” diesel injection systems from Motor vehicles can be used, the body the piezo actuator is square or rectangular Has cross-sectional contour and together with one two-legged pre-tensioning bracket that runs along each other opposite outer sides of the actuator body attached is, within a longitudinal bore of the injector body sitting.
- a piezo multilayer actuator for injection systems, especially one Injector used in "Common Rail" diesel injection systems from Motor vehicles can be used, the body the piezo actuator is square or rectangular Has cross-sectional contour and together with one two-legged pre-tensioning bracket that runs along each other opposite outer sides of the actuator body attached is, within a longitudinal bore of the injector body sitting.
- Such an injector is e.g. B. from DE 40 36 287 C2 or DE-A-19 650 900 known.
- the attached Figure 1 shows a schematic Longitudinal section A and in a cross section B schematically one such injector, in which within an injector body 2 an actuator forming a multilayer piezo body 1 Actuation of a plunger (not shown) of the injector by means of two spring bands 3a, 3b Tensioning bracket between its opposite End faces is resiliently clamped.
- the square Actuator body 1 is seated in a cylindrical longitudinal bore 5 the injector body 2.
- FIG. 1 Like the schematic cross-sectional view B in FIG. 1 shows are on the long sides of the actuator body 1 Electrodes and contact tracks 4 attached.
- the for Contacting long sides of the actuator body 1 are those on which the clamps 3a, 3b are not along to lead.
- piezo actuators as shown in FIG. 1, cheapest in rectangular or square Shape can be made. This is because the Actuator body made in greater use and end up in Individual actuators are sawn.
- a "common rail" injector with one rectangular or square piezo actuator is a smallest possible outside diameter of the injector body in The cylinder head of an internal combustion engine is important. usual Outside diameters are approximately 19 to 21 mm. In these The diameter of the actuator body including its Preload bracket, the electrode contact and a (in Figure 1 not shown) leading to the nozzle of the injector High pressure hole are introduced.
- a rectangular or square inner bore with rounded corners of the Actuator body with a square or rectangular outer contour together with its pretensioners relatively narrow from the Inner bore of the injector body are enclosed, wherein at the same time space for the high pressure drilling in the Injector body is created.
- the high pressure bore can be located opposite in the injector body also a drain hole parallel to the longitudinal axis of the Injector body.
- the actuator body is not square must, but have a rectangular cross-sectional contour can.
- the inner longitudinal bore of the injector body also be designed so that both the legs of the Preload bracket as well as the contact tracks along the same Rectangular sides of the actuator body are guided.
- the Cross-sectional shape of the inner longitudinal bore in the injector body also be rounded so that on two parallel side walls the inner longitudinal bore two approximately circular in cross section Connect side walls.
- This hole can also be a broach by broaching or by electrochemical removal.
- FIG. 1 shows the known injector already described, whose injector body is circular cylindrical Has longitudinal bore.
- Figures 2 to 6 each show schematically in Cross section of a central section of a injector according to the invention with differently designed Actuator bodies and differently arranged pretensioning brackets.
- FIG. 7 shows a longitudinal section of the one shown in FIG. 4 Embodiment of an injector according to the invention.
- FIG. 2 schematically in the form of a cross section illustrated first embodiment of the injector according to the invention includes within a rectangular longitudinal bore 9 with rounded corners Injector body 10 a multi-layer piezoelectric Actuator, the body 11 in the cross section shown a has a square outer contour with the sides a, b, c and d.
- Preload brackets 12 protrude along the sides a and c, which the Actuator body 11 between its (not to be recognized) Clamp face ends.
- the cross-sectional contour of the Inner longitudinal bore 9 of the injector body 10 is selected that at the other opposite each other Rectangular sides b and d of the actuator body 11 place for Contact webs 15 in the injector body outside of Inner longitudinal bore 9 still has space for a high-pressure bore 14 and an opposite drain hole 16 remains both sides b and d of the actuator body 11 opposite and in the direction of the longitudinal axis of the Guide injector body.
- Embodiment of an injector according to the invention sits square actuator body 11 within a rounded rectangular inner longitudinal bore 19 of an injector body 20.
- the location of the opposing legs 12 of the Preload bracket, the contact webs 15, the high pressure bore 14 and the leak oil bore 16 are the same as in FIG. 2.
- the cross-sectional contour of the inner longitudinal bore 19 in the injector body 20 differently than in Figure 2, because the two parallel sides of the rectangle are separated by two Cross-section of arcuate, especially circular sides connected, the two circular sides concentric to the outer contour of the injector body 20 can run.
- the third shown in cross section in FIG. 4 Has embodiment of an injector according to the invention instead of a square, a clearly rectangular one Actuator body 11, and the opposite one another Legs of the pretensioning bracket 12 extend along the (in cross section) longer rectangle sides b and d of the Actuator body 11, while the high pressure bore 14 and the Leak oil hole 14 and the contact webs 15 along the shorter rectangle sides a and c of the actuator body 11.
- FIG. 5 has the cross-sectional contour of the inner longitudinal bore 39 one Injector body 40 again a shape, as already in the second embodiment of Figure 3 is provided, and the two legs of the pretensioning bracket 12 and both Contact webs 15 extend along the (in Cross section) longer sides of the rectangle b and d of Actuator body 11, which, as in Figure 4, is not square but is rectangular.
- the high pressure bore 14 and the Leak oil bore 16 lead along the shorter (in cross section) Rectangular sides a and c of the actuator body 11.
- Figure 7 finally shows in longitudinal section that in Figure 4 in Cross section shown embodiment of a injector according to the invention.
- the contact webs 15 are located each in front and behind the actuator body 11 and also the leak oil drilling and the high pressure drilling, see above that they are not visible in Figure 7.
- Figure 7 shows clearly the location and function of the pretensioning bracket, which the both ends of the actuator body under tension hold.
- the one described above enables "Common rail" injector according to the invention has a short design of the actuator with optimized space requirements of the Injector inside the cylinder head one Combustion engine.
- a Rectangular or square can be produced inexpensively Due to the rounded cross-sectional contour of the actuator Internal longitudinal bore of the injector body additional space for the high pressure bore in the injector body and the Leakage oil drilling can be created.
Abstract
Description
Die Erfindung geht aus von einem Injektor mit Piezo-Mehrlagenaktor für Einspritzsysteme, insbesondere einem Injektor, der bei "Common-Rail"-Dieseleinspritzsystemen von Kraftfahrzeugen Verwendung finden kann, wobei der Körper des Piezoaktors eine quadratische oder rechteckige Querschnittskontur hat und zusammen mit einem zweischenkligen Vorspannungsbügel, der längs einander gegenüberliegenden Außenseiten des Aktorkörpers angebracht ist, innerhalb einer Längsbohrung des Injektorkörpers sitzt. Ein derartiger Injektor ist z. B. aus der DE 40 36 287 C2 oder der DE-A-19 650 900 bekannt.The invention is based on an injector with a piezo multilayer actuator for injection systems, especially one Injector used in "Common Rail" diesel injection systems from Motor vehicles can be used, the body the piezo actuator is square or rectangular Has cross-sectional contour and together with one two-legged pre-tensioning bracket that runs along each other opposite outer sides of the actuator body attached is, within a longitudinal bore of the injector body sitting. Such an injector is e.g. B. from DE 40 36 287 C2 or DE-A-19 650 900 known.
Die beiliegende Figur 1 zeigt in einem schematischen
Längsschnitt A und in einem Querschnitt B schematisch einen
solchen Injektor, bei dem innerhalb eines Injektorkörpers 2
ein einen mehrlagigen Piezokörper 1 bildender Aktor zur
Betätigung eines (nicht gezeigten) Stößels des Injektors
mittels zweier als Federbänder 3a, 3b ausgebildeter
Spannbügel zwischen seinen einander gegenüberliegenden
Stirnseiten federnd eingespannt ist. Der quadratische
Aktorkörper 1 sitzt in einer zylindrischen Längsbohrung 5
des Injektorkörpers 2. The attached Figure 1 shows a schematic
Longitudinal section A and in a cross section B schematically one
such injector, in which within an
Wie die schematische Querschnittsansicht B in Figur 1
zeigt, sind an den Längsseiten des Aktorkörpers 1
Elektroden und Kontaktbahnen 4 angebracht. Die zur
Kontaktierung dienenden Längsseiten des Aktorkörpers 1 sind
diejenigen, an denen die Spannbügel 3a, 3b nicht entlang
führen.Like the schematic cross-sectional view B in FIG. 1
shows are on the long sides of the
Es ist bekannt, daß Piezoaktoren, wie in Figur 1 gezeigt, am kostengünstigsten in rechteckiger oder quadratischer Form hergestellt werden können. Dies liegt daran, daß die Aktorkörper in größeren Nutzen hergestellt und am Ende in Einzelaktoren zersägt werden. Bei einer kurzen Bauform eines "Common-Rail"-Injektors mit einem solchen rechteckigen oder quadratischen Piezoaktor ist ein möglichst kleiner Außendurchmesser des Injektorkörpers im Zylinderkopf eines Verbrennungsmotors wichtig. Übliche Außendurchmesser sind etwa 19 bis 21 mm. In diesen Durchmesser muß der Aktorkörper einschließlich seiner Vorspannbügel, die Elektrodenkontaktierung und eine (in Figur 1 nicht gezeigte) zur Düse des Injektors führende Hochdruckbohrung eingebracht werden.It is known that piezo actuators, as shown in FIG. 1, cheapest in rectangular or square Shape can be made. This is because the Actuator body made in greater use and end up in Individual actuators are sawn. With a short design a "common rail" injector with one rectangular or square piezo actuator is a smallest possible outside diameter of the injector body in The cylinder head of an internal combustion engine is important. usual Outside diameters are approximately 19 to 21 mm. In these The diameter of the actuator body including its Preload bracket, the electrode contact and a (in Figure 1 not shown) leading to the nozzle of the injector High pressure hole are introduced.
Es ist Aufgabe der Erfindung, einen gattungsgemäßen Injektor so zu gestalten, daß innerhalb eines Injektorkörpers mit dem oben erwähnten Außendurchmesser platzsparend ein leistungsfähiger rechteckiger oder quadratischer Piezo-Mehrlagenaktor, dessen Vorspannbügel sowie die Hochdruckbohrung untergebracht werden können.It is an object of the invention, a generic To design the injector so that within a Injector body with the outer diameter mentioned above a powerful rectangular or space-saving square piezo multi-layer actuator, its pretensioning bracket as well as the high pressure bore can be accommodated.
Erfindungsgemäß kann durch eine rechteckige oder quadratische Innenbohrung mit abgerundeten Ecken der Aktorkörper mit quadratischer oder rechteckiger Außenkontur zusammen mit seinen Vorspannbügeln relativ eng von der Innenbohrung des Injektorkörpers umschlossen werden, wobei gleichzeitig Bauraum für die Hochdruckbohrung im Injektorkörper geschaffen wird.According to the invention, a rectangular or square inner bore with rounded corners of the Actuator body with a square or rectangular outer contour together with its pretensioners relatively narrow from the Inner bore of the injector body are enclosed, wherein at the same time space for the high pressure drilling in the Injector body is created.
Bei einem Ausführungsbeispiel ist die Hochdruckbohrung im Injektorkörper entlang einer der Seiten des Aktorkörpers geführt, an der kein Schenkel des Vorspannbügels liegt. Dabei kann der Hochdruckbohrung gegenüber im Injektorkörper außerdem eine Leckölbohrung achsparallel zur Längsachse des Injektorkörpers liegen.In one embodiment, the high pressure bore in Injector body along one of the sides of the actuator body out, on which there is no leg of the pretensioning bracket. The high pressure bore can be located opposite in the injector body also a drain hole parallel to the longitudinal axis of the Injector body.
Wichtig ist, daß der Aktorkörper nicht quadratisch sein muß, sondern eine rechteckige Querschnittskontur haben kann. In diesem Fall können die beiden Schenkel des Vorspannbügels entlang den beiden längeren Rechteckseiten des Aktorkörpers führen, wobei dann die Kontaktbahnen an den beiden anderen, d. h. kurzen Rechteckseiten des Aktorkörpers liegen.It is important that the actuator body is not square must, but have a rectangular cross-sectional contour can. In this case, the two legs of the Preload bracket along the two longer sides of the rectangle of the actuator body, the contact tracks then the other two, d. H. short sides of the rectangle Actuator body lie.
Alternativ kann die Innenlängsbohrung des Injektorkörpers auch so gestaltet sein, daß sowohl die Schenkel des Vorspannbügels als auch die Kontaktbahnen entlang denselben Rechteckseiten des Aktorkörpers geführt sind.Alternatively, the inner longitudinal bore of the injector body also be designed so that both the legs of the Preload bracket as well as the contact tracks along the same Rectangular sides of the actuator body are guided.
Da die senkrecht zur Richtung der Längsachse des Injektorkörpers gemessene Breite der Schenkel des Vorspannbügels geringer sein kann als die Breite der jeweils zugeordneten Seiten des Aktorkörpers, kann die Querschnittsform der Innenlängsbohrung im Injektorkörper auch so abgerundet sein, daß an zwei parallele Seitenwände der Innenlängsbohrung zwei in Querschnitt etwa kreisförmige Seitenwände anschließen. Auch diese Bohrung kann mittels eines Räumwerkzeugs durch Räumen oder durch elektrochemisches Abtragen hergestellt werden.Since the perpendicular to the direction of the longitudinal axis of the Injector body measured width of the legs of the Preload bracket may be less than the width of the respectively assigned sides of the actuator body, the Cross-sectional shape of the inner longitudinal bore in the injector body also be rounded so that on two parallel side walls the inner longitudinal bore two approximately circular in cross section Connect side walls. This hole can also be a broach by broaching or by electrochemical removal.
Nachstehend werden verschiedene Ausführungsformen und Varianten des erfindungsgemäßen Injektors anhand der Zeichnung näher beschrieben.Various embodiments and Variants of the injector according to the invention using the Drawing described in more detail.
Figur 1 zeigt den bereits beschriebenen bekannten Injektor, dessen Injektorkörper eine kreiszylindrische Innenlängsbohrung hat.FIG. 1 shows the known injector already described, whose injector body is circular cylindrical Has longitudinal bore.
Die Figuren 2 bis 6 zeigen schematisch jeweils im Querschnitt einen zentralen Abschnitt eines erfindungsgemäßen Injektors mit unterschiedlich gestalteten Aktorkörpern und verschieden angeordneten Vorspannbügeln.Figures 2 to 6 each show schematically in Cross section of a central section of a injector according to the invention with differently designed Actuator bodies and differently arranged pretensioning brackets.
Figur 7 zeigt einen Längsschnitt der in Figur 4 gezeigten Ausführungsform eines erfindungsgemäßen Injektors.FIG. 7 shows a longitudinal section of the one shown in FIG. 4 Embodiment of an injector according to the invention.
Das in Figur 2 schematisch in Form eines Querschnitts
dargestellte erste Ausführungsbeispiel des
erfindungsgemäßen Injektors beinhaltet innerhalb einer
rechteckigen Längsbohrung 9 mit abgerundeten Ecken eines
Injektorkörpers 10 einen mehrlagigen piezoelektrischen
Aktor, dessen Körper 11 in dem gezeigten Querschnitt eine
quadratische Außenkontur mit den Seiten a, b, c und d hat.
Entlang den Seiten a und c ragen Vorspannbügel 12, die den
Aktorkörper 11 zwischen seinen (nicht zu erkennenden)
Stirnseiten einspannen. Die Querschnittskontur der
Innenlängsbohrung 9 des Injektorkörpers 10 ist so gewählt,
daß an den anderen einander gegenüberliegenden
Rechteckseiten b und d des Aktorkörpers 11 Platz für
Kontaktstege 15 im Injektorkörper außerhalb der
Innenlängsbohrung 9 noch Platz für eine Hochdruckbohrung 14
und eine gegenüberliegende Leckölbohrung 16 bleibt, die
beide den Seiten b und d des Aktorkörpers 11
gegenüberliegen und in Richtung der Längsachse des
Injektorkörpers führen.That in Figure 2 schematically in the form of a cross section
illustrated first embodiment of the
injector according to the invention includes within a
rectangular
Auch in der in Figur 3 im Querschnitt gezeigten zweiten
Ausführungsform eines erfindungsgemäßen Injektors sitzt ein
quadratischer Aktorkörper 11 innerhalb einer abgerundeten
rechteckigen Innenlängsbohrung 19 eines Injektorkörpers 20.
Die Lage der einander gegenüberliegenden Schenkel 12 des
Vorspannbügels, der Kontaktstege 15, der Hochdruckbohrung
14 und der Leckölbohrung 16 sind dieselben wie in Figur 2.
Allerdings ist die Querschnittskontur der Innenlängsbohrung
19 im Injektorkörper 20 anders als in Figur 2, denn die
beiden parallelen Rechteckseiten sind durch zwei im
Querschnitt bogenförmige, besonders kreisförmige Seiten
verbunden, wobei die beiden kreisförmigen Seiten
konzentrisch zur Außenkontur des Injektorkörpers 20
verlaufen können.Also in the second shown in cross section in Figure 3
Embodiment of an injector according to the invention sits
Das in Figur 4 im Querschnitt gezeigte dritte
Ausführungsbeispiel eines erfindungsgemäßen Injektors hat
statt eines quadratischen einen deutlich rechteckförmigen
Aktorkörper 11, und die einander gegenüberliegenden
Schenkel des Vorspannbügels 12 erstrecken sich entlang den
(im Querschnitt) längeren Rechteckseiten b und d des
Aktorkörpers 11, während die Hochdruckbohrung 14 und die
Leckölbohrung 14 sowie die Kontaktstege 15 entlang den
kürzeren Rechteckseiten a und c des Aktorkörpers 11 liegen.The third shown in cross section in FIG. 4
Has embodiment of an injector according to the invention
instead of a square, a clearly rectangular one
Bei dem in Figur 5 gezeigten vierten Ausführungsbeispiel
hat die Querschnittskontur der Innenlängsbohrung 39 eines
Injektorkörpers 40 wieder eine Form, wie sie bereits im
zweiten Ausführungsbeispiel der Figur 3 vorgesehen ist, und
die beiden Schenkel des Vorspannbügels 12 sowie beide
Kontaktstege 15 erstrecken sich entlang den (im
Querschnitt) längeren Rechteckseiten b und d des
Aktorkörpers 11, der, wie in Figur 4, nicht quadratisch
sondern rechteckig ist. Die Hochdruckbohrung 14 und die
Leckölbohrung 16 führen längs den (im Querschnitt) kürzeren
Rechteckseiten a und c des Aktorkörpers 11.In the fourth exemplary embodiment shown in FIG. 5
has the cross-sectional contour of the inner
Die Anordnung der Schenkel des Vorspannbügels 12, der
Kontaktstege 15 und der Hochdruckbohrung 14 sowie der
Leckölbohrung 16 innerhalb eines Injektorkörpers 50 sind
bei dem in Figur 6 gezeigten fünften Ausführungsbeispiel
gleichartig wie in Figur 2, mit dem Unterschied, daß der
Aktorkörper 11 bei dem in Figur 2 gezeigten
Ausführungsbeispiel einen quadratischen Querschnitt und in
dem Ausführungsbeispiel gemäß Figur 6 einen deutlich
rechteckigen Querschnitt hat. Deshalb ist auch die
Querschnittsform der Innenlängsbohrung 49 bei dem in Figur
6 gezeigten Injektorkörper 50 deutlich rechteckig, so daß
der Injektorkörper 50 selbst genügend Platz für die beiden
Bohrungen, nämlich die Hochdruckbohrung 14 und die
Leckölbohrung 16 bietet.The arrangement of the legs of the
Figur 7 schließlich zeigt im Längsschnitt das in Figur 4 im
Querschnitt gezeigte Ausführungsbeispiel eines
erfindungsgemäßen Injektors. Die Kontaktstege 15 befinden
sich jeweils vor und hinter dem Aktorkörper 11 und
ebenfalls die Leckölbohrung und die Hochdruckbohrung, so
daß sie in Figur 7 nicht sichtbar sind. Figur 7 zeigt
deutlich die Lage und Funktion der Vorspannbügel, die die
beiden Stirnseiten des Aktorkörpers unter Vorspannung
halten.Figure 7 finally shows in longitudinal section that in Figure 4 in
Cross section shown embodiment of a
injector according to the invention. The
Wichtig ist, daß, wie die in den Figuren 5 bis 7 dargestellten Ausführungsbeispiele zeigen, der Aktorkörper nicht quadratisch sein muß.It is important that, like that in FIGS The exemplary embodiments shown show the actuator body does not have to be square.
Vorteilhafterweise ermöglicht der, oben beschriebene erfindungsgemäße "Common-Rail"-Injektor eine kurze Bauform des Aktors bei gleichzeitig optimiertem Platzbedarf des Injektors innerhalb des Zylinderkopfes einer Verbrennungsmaschine. Mit der Verwendung eines kostengünstig herstellbaren rechteckigen oder quadratischen Aktors kann durch die abgerundete Querschnittskontur der Innenlängsbohrung des Injektorkörpers zusätzlich Raum für die im Injektorkörper liegende Hochdruckbohrung sowie die Leckölbohrung geschaffen werden.Advantageously, the one described above enables "Common rail" injector according to the invention has a short design of the actuator with optimized space requirements of the Injector inside the cylinder head one Combustion engine. With the use of a Rectangular or square can be produced inexpensively Due to the rounded cross-sectional contour of the actuator Internal longitudinal bore of the injector body additional space for the high pressure bore in the injector body and the Leakage oil drilling can be created.
Claims (8)
- Injector with a piezoelectric multi-layer actuator for injection systems, in particular for common-rail diesel injection systems of motor vehicles, the body of the piezoelectric actuator (11) having a square or rectangular cross-sectional contour and, together with a two-legged prestressing yoke mounted along mutually opposite outer faces of the actuator body (11), being seated within a longitudinal bore (9; 19; 29; 39; 49) of the injector body (10; 20; 30; 40; 50), characterized in that the longitudinal bore (9; 19; 29; 39; 49) has an angular cross-sectional shape with rounded corners which is adapted to the cross-sectional contour of the actuator body and of the prestressing yoke, so that room is provided in the injector body, outside the longitudinal bore, for a high-pressure bore (14) lying parallel to the longitudinal axis of the injector.
- Injector according to Claim 1, characterized in that the high-pressure bore (14) in the injector body lies on one of the sides of the actuator body (11) on which there is no leg of the prestressing yoke (12).
- Injector according to Claim 1 or 2, characterized in that, furthermore, in the injector body (10), a leakage-oil bore (16) located opposite the high-pressure bore leads parallel to the axis of the injector body.
- Injector according to one of the preceding claims, characterized in that the cross-sectional contour of the actuator body is not square, but rectangular.
- Injector according to Claim 4, characterized in that the two legs of the prestressing yoke (12) lead along the two longer rectangle sides of the actuator body (11).
- Injector according to Claim 4, characterized in that the two legs of the prestressing yoke lead along the two shorter rectangle sides of the actuator body (11).
- Injector according to one of the preceding claims, characterized in that the width of the legs of the prestressing yoke (12), measured in a direction perpendicular to the longitudinal axis of the injector body, is smaller than the width of the associated side of the actuator body (11).
- Injector according to one of the preceding claims, characterized in that the longitudinal bore (9; 19; 29; 39; 49) of the injector body is produced by broaching or electrochemical erosion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19905413A DE19905413A1 (en) | 1999-02-10 | 1999-02-10 | Injector with piezo multilayer actuator for injection systems |
| DE19905413 | 1999-02-10 | ||
| PCT/DE2000/000214 WO2000047887A1 (en) | 1999-02-10 | 2000-01-26 | Injector comprising a piezo multilayer actuator for injection systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1070201A1 EP1070201A1 (en) | 2001-01-24 |
| EP1070201B1 true EP1070201B1 (en) | 2004-04-07 |
Family
ID=7896984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00907452A Expired - Lifetime EP1070201B1 (en) | 1999-02-10 | 2000-01-26 | Injector comprising a piezo multilayer actuator for injection systems |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6315216B1 (en) |
| EP (1) | EP1070201B1 (en) |
| JP (1) | JP2002536591A (en) |
| AT (1) | ATE263923T1 (en) |
| DE (2) | DE19905413A1 (en) |
| WO (1) | WO2000047887A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19906467A1 (en) * | 1999-02-16 | 2000-08-24 | Bosch Gmbh Robert | Injector with piezo multilayer actuator in particular for common rail diesel injection system |
| EP1160885B1 (en) * | 2000-05-31 | 2010-08-18 | Denso Corporation | Piezoelectric device for injector |
| DE10140196A1 (en) * | 2001-08-16 | 2003-03-13 | Bosch Gmbh Robert | Sleeve-shaped hollow body for a piezo actuator module and method for its production |
| US6811093B2 (en) * | 2002-10-17 | 2004-11-02 | Tecumseh Products Company | Piezoelectric actuated fuel injectors |
| US20050258715A1 (en) * | 2004-05-19 | 2005-11-24 | Schlabach Roderic A | Piezoelectric actuator having minimal displacement drift with temperature and high durability |
| DE102005024710A1 (en) * | 2005-05-30 | 2006-12-07 | Robert Bosch Gmbh | Fuel injector |
| DE102005046440B4 (en) * | 2005-09-28 | 2007-07-19 | Siemens Ag | tension spring |
| US7703479B2 (en) * | 2005-10-17 | 2010-04-27 | The University Of Kentucky Research Foundation | Plasma actuator |
| US7861977B1 (en) | 2006-03-13 | 2011-01-04 | The United States Of America As Represented By The Secretary Of The Navy | Adaptive material actuators for Coanda effect circulation control slots |
| DE102006014251A1 (en) * | 2006-03-28 | 2007-10-04 | Robert Bosch Gmbh | Fuel injector for internal combustion engine, has piezo-actuator coupled with nozzle needle and preloaded by defined preload force that acts in same direction as compressive force and is larger than compressive force |
| DE102006026152A1 (en) * | 2006-06-06 | 2007-12-13 | Robert Bosch Gmbh | Arrangement with a coated piezoelectric actuator |
| US7531944B2 (en) * | 2007-02-09 | 2009-05-12 | Delphi Technologies, Inc. | Piezoelectric actuator and enclosure therefor |
| DE102009020270A1 (en) * | 2009-05-07 | 2010-11-11 | Continental Automotive Gmbh | actuator |
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| US4471256A (en) | 1982-06-14 | 1984-09-11 | Nippon Soken, Inc. | Piezoelectric actuator, and valve apparatus having actuator |
| JPS59206671A (en) * | 1983-05-11 | 1984-11-22 | Nippon Soken Inc | Control valve apparatus having electrostriction element |
| JPS6053660A (en) * | 1983-09-02 | 1985-03-27 | Nippon Soken Inc | Fuel injection valve |
| DE3533975A1 (en) | 1985-09-24 | 1987-03-26 | Bosch Gmbh Robert | METERING VALVE FOR DOSING LIQUIDS OR GASES |
| US4803393A (en) | 1986-07-31 | 1989-02-07 | Toyota Jidosha Kabushiki Kaisha | Piezoelectric actuator |
| JPH01100973U (en) * | 1987-12-25 | 1989-07-06 | ||
| US5004945A (en) | 1988-09-26 | 1991-04-02 | Nippondenso Co., Ltd. | Piezoelectric type actuator |
| JPH0335258U (en) * | 1989-08-15 | 1991-04-05 | ||
| US5092360A (en) * | 1989-11-14 | 1992-03-03 | Hitachi Metals, Ltd. | Flow rated control valve using a high-temperature stacked-type displacement device |
| DE59008025D1 (en) | 1990-03-09 | 1995-01-26 | Siemens Ag | Valve with a piezoelectric actuator. |
| JPH05110155A (en) * | 1991-10-21 | 1993-04-30 | Nec Corp | Electrostrictive element |
| JPH05218523A (en) * | 1992-01-08 | 1993-08-27 | Nec Corp | Simplified armor type electrostrivtive effect element |
| US5248087A (en) | 1992-05-08 | 1993-09-28 | Dressler John L | Liquid droplet generator |
| JPH0974233A (en) * | 1995-09-01 | 1997-03-18 | Denso Corp | Laminated piezo-electric device |
| DE19548526A1 (en) * | 1995-12-22 | 1997-07-03 | Daimler Benz Ag | Injection valve for internal combustion engines of common rail systems |
| DE19650900A1 (en) * | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | Piezoelectric actuator |
| DE19702066C2 (en) | 1997-01-22 | 1998-10-29 | Daimler Benz Ag | Piezoelectric injector for fuel injection systems of internal combustion engines |
| DE19715487C2 (en) * | 1997-04-14 | 2002-06-13 | Siemens Ag | Piezoelectric actuator with a hollow profile |
| DE19744235A1 (en) * | 1997-10-07 | 1999-04-08 | Fev Motorentech Gmbh & Co Kg | Fuel injection nozzle for IC engine |
| EP0937891B1 (en) * | 1998-02-19 | 2003-10-01 | Delphi Technologies, Inc. | Fuel Injector |
-
1999
- 1999-02-10 DE DE19905413A patent/DE19905413A1/en not_active Ceased
-
2000
- 2000-01-26 EP EP00907452A patent/EP1070201B1/en not_active Expired - Lifetime
- 2000-01-26 WO PCT/DE2000/000214 patent/WO2000047887A1/en active IP Right Grant
- 2000-01-26 DE DE50005959T patent/DE50005959D1/en not_active Expired - Lifetime
- 2000-01-26 US US09/673,023 patent/US6315216B1/en not_active Expired - Fee Related
- 2000-01-26 JP JP2000598764A patent/JP2002536591A/en active Pending
- 2000-01-26 AT AT00907452T patent/ATE263923T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE263923T1 (en) | 2004-04-15 |
| JP2002536591A (en) | 2002-10-29 |
| DE19905413A1 (en) | 2000-08-24 |
| EP1070201A1 (en) | 2001-01-24 |
| US6315216B1 (en) | 2001-11-13 |
| DE50005959D1 (en) | 2004-05-13 |
| WO2000047887A1 (en) | 2000-08-17 |
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