EP1803930A1 - Module with weld suited for high pressure - Google Patents

Module with weld suited for high pressure Download PDF

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Publication number
EP1803930A1
EP1803930A1 EP06123335A EP06123335A EP1803930A1 EP 1803930 A1 EP1803930 A1 EP 1803930A1 EP 06123335 A EP06123335 A EP 06123335A EP 06123335 A EP06123335 A EP 06123335A EP 1803930 A1 EP1803930 A1 EP 1803930A1
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EP
European Patent Office
Prior art keywords
housing
module
head
foot part
module according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP06123335A
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German (de)
French (fr)
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EP1803930B1 (en
Inventor
Johann Bayer
Christian Suenkel
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP1803930A1 publication Critical patent/EP1803930A1/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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • 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

Definitions

  • the invention relates to a module component with axially rotationally symmetrical weld, for example, for use in high-pressure fuel injection valves, according to the preamble of the main claim.
  • a method for welding axial rotationally symmetrical welds with a laser beam and an apparatus for producing such welds known is from the DE 102 54 847 A1 a method for welding axial rotationally symmetrical welds with a laser beam and an apparatus for producing such welds known.
  • the method provides that a laser beam is used as the beam source and the laser beam is transformed by suitable optics into a ring and this is focused on the workpiece.
  • the module according to the invention with the characterizing features of the main claim has the advantage that both a pressure-relieved and pressure-tight connection of the components is possible by a suitable design of the individual joining partners and the combination of welding and compression.
  • the head and the foot each have a circumferential collar, which is welded to the housing.
  • a further advantage is that the head and the foot part each have a circumferential projection on the outside facing the housing, in the region of which the housing is pressed, so that a pressure relief of the welds is possible.
  • weld seams For high-pressure applications, it is necessary to design weld seams to the respective load case. Especially at dynamically occurring loads between 0 and 250 bar increased demands are made because welds on which the load on a sharp notch (structure notch) may not have the necessary strength, resulting in damage to the welded components with subsequent malfunction or even can cause complete failure of the pressure-loaded device.
  • the structural groove acts by a jump in stiffness at the junction of the housing, which works with the applied internal pressure in the radial direction, on the connection part, which behaves like a block. The damage takes place by notch effect over voltage peaks in the loaded components, which are also favored by the structural change of the material by the welding process.
  • FIG. 1A An exemplary embodiment of a module 1, which can be used, for example, in a high-pressure fuel injection valve and which, due to its design, is subject to the notch effects described above, is shown in highly schematic form in FIG. 1A.
  • the module 1 can be used in particular as a housing module of a piezoelectric actuator for a fuel injection valve for direct injection of fuel into a combustion chamber of an internal combustion engine.
  • a head part 2 and a foot part 3 are inserted into a tubular housing member 4 and connected by a respective weld 5, 6 with this.
  • the measures according to the invention are aimed at reducing the notch effect with subsequent improved durability of the components subject to pressure.
  • Constructive measures are on the one hand the displacement of the point of highest load from the weld 5, 6 and on the other hand a flowing, almost notch-free transition from weld metal into the heat affected zone and from there into the base material of the components, combined with a suitable design of the components in the Welds 5, 6.
  • the head and foot part 2, 3 each have a circumferential, radially outwardly of the housing 4 oriented projection 8. If the housing 4 is pressed in the region of this projection 8, the welds 5, 6 can be depressurized, whereby fatigue fractures 7 can also be effectively contained.
  • the invention is not limited to the illustrated embodiment. All features of the invention can be combined with one another as desired. Each feature in itself, so both the collar 9, as well as the compression, can act as far pressure relieving that the construction meets the requirements.

Abstract

A module comprises a foot part (3) and a head part welded or pressed with a housing (4). Preferred Features: The head part and the foot part each have a peripheral collar (9). The housing is welded to the collar of the head part or foot part. The inner chamber (10) of the module is sealed using welding seams (6).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Modul-Bauteil mit axial rotationssymmetrischer Schweißnaht, beispielsweise zur Anwendung in Hochdruck-Brennstoffeinspritzventilen, nach der Gattung des Hauptanspruchs.The invention relates to a module component with axially rotationally symmetrical weld, for example, for use in high-pressure fuel injection valves, according to the preamble of the main claim.

Beispielsweise ist aus der DE 102 54 847 A1 ein Verfahren zum Schweißen axialer rotationssymmetrischer Schweißnähte mit einem Laserstrahl sowie eine Vorrichtung zum Herstellen solcher Schweißnähte bekannt. Das Verfahren sieht vor, daß als Strahlquelle ein Laserstrahl verwendet wird und der Laserstrahl durch eine geeignete Optik in einen Ring transformiert und dieser auf das Werkstück fokussiert wird.For example, is from the DE 102 54 847 A1 a method for welding axial rotationally symmetrical welds with a laser beam and an apparatus for producing such welds known. The method provides that a laser beam is used as the beam source and the laser beam is transformed by suitable optics into a ring and this is focused on the workpiece.

Nachteilig bei den durch das aus der DE 102 54 847 A1 bekannten Schweißverfahren hergestellten Schweißnähten ist dabei, daß diese nicht ausreichend druckbelastbar in einem Bereich von dynamischen Druckschwankungen zwischen 0 und 250 bar sind.Disadvantageous in the by the from the DE 102 54 847 A1 Welding seams produced by known welding methods is that they are not sufficiently pressure-resistant in a range of dynamic pressure fluctuations between 0 and 250 bar.

Vorteile der ErfindungAdvantages of the invention

Demgegenüber hat das erfindungsgemäß ausgebildete Modul mit den kennzeichnenden Merkmalen des Hauptanspruchs den Vorteil, daß durch eine geeignete Ausgestaltung der einzelnen Fügepartner sowie die Kombination von Verschweißung und Verpressung eine sowohl druckentlastete als auch druckdichte Verbindung der Komponenten möglich ist.In contrast, the module according to the invention with the characterizing features of the main claim has the advantage that both a pressure-relieved and pressure-tight connection of the components is possible by a suitable design of the individual joining partners and the combination of welding and compression.

Weitere vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen angegeben.Further advantageous embodiments of the invention are specified in the subclaims.

Vorteilhafterweise weist das Kopf- und das Fußteil jeweils einen umlaufenden Kragen auf, welcher mit dem Gehäuse verschweißt ist.Advantageously, the head and the foot each have a circumferential collar, which is welded to the housing.

Weiterhin ist von Vorteil, daß das Kopf- und das Fußteil jeweils einen umlaufenden Vorsprung an der dem Gehäuse zugewandten Außenseite aufweisen, im Bereich dessen das Gehäuse verpreßt wird, so daß eine Druckentlastung der Schweißnähte möglich ist.A further advantage is that the head and the foot part each have a circumferential projection on the outside facing the housing, in the region of which the housing is pressed, so that a pressure relief of the welds is possible.

Zeichnungdrawing

Ein Ausführungsbeispiel eines erfindungsgemäß ausgestalteten Bauteils ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1A
eine stark schematisierte Darstellung eines Ausführungsbeispiels eines vormontierten Moduls eines Brennstoffeinspritzventils unter Verwendung herkömmlich ausgebildeter Schweißnähte;
Fig. 1B
einen Ausschnitt aus Fig. 1A im Bereich IB,
Fig. 2A
eine stark schematisierte Darstellung eines Ausführungsbeispiels eines vormontierten Moduls eines Brennstoffeinspritzventils unter Verwendung erfindungsgemäß ausgebildeter Schweißnähte; und
Fig. 2B
einen Ausschnitt aus Fig. 2A im Bereich IIB.
An embodiment of an inventively designed component is shown in simplified form in the drawing and explained in more detail in the following description. Show it:
Fig. 1A
a highly schematic representation of an embodiment of a preassembled module of a fuel injection valve using conventionally formed welds;
Fig. 1B
a section of FIG. 1A in the area IB,
Fig. 2A
a highly schematic representation of an embodiment of a preassembled module of a fuel injection valve using inventively designed welds; and
Fig. 2B
a section of Fig. 2A in the area IIB.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Für Hochdruckanwendungen ist es notwendig, Schweißnähte auf den jeweiligen Belastungsfall abgestimmt zu gestalten. Speziell bei dynamisch auftretenden Lasten zwischen 0 und 250 bar werden erhöhte Anforderungen gestellt, da Schweißnähte, auf denen die Last an einer scharfen Kerbe (Strukturkerbe) wirkt, u.U. nicht die nötige Festigkeit aufweisen, was zu einer Beschädigung der verschweißten Bauteile mit nachfolgender Fehlfunktion oder sogar vollständigem Ausfall der druckbelasteten Vorrichtung führen kann. Die Strukturkerbe wirkt durch einen Steifigkeitssprung an der Verbindungsstelle vom Gehäuse, das mit dem aufgebrachten Innendruck auch in radialer Richtung arbeitet, auf das Anschlußteil, das sich wie ein Block verhält. Die Beschädigung erfolgt dabei durch Kerbwirkung über Spannungsspitzen in den belasteten Bauteilen, welche zudem durch die Strukturveränderung des Materials durch den Schweißvorgang begünstigt sind.For high-pressure applications, it is necessary to design weld seams to the respective load case. Especially at dynamically occurring loads between 0 and 250 bar increased demands are made because welds on which the load on a sharp notch (structure notch) may not have the necessary strength, resulting in damage to the welded components with subsequent malfunction or even can cause complete failure of the pressure-loaded device. The structural groove acts by a jump in stiffness at the junction of the housing, which works with the applied internal pressure in the radial direction, on the connection part, which behaves like a block. The damage takes place by notch effect over voltage peaks in the loaded components, which are also favored by the structural change of the material by the welding process.

Ein Ausführungsbeispiel eines Moduls 1, welches beispielsweise in einem Hochdruck-Brennstoffeinspritzventil Verwendung finden kann und welches aufgrund seiner Bauweise den vorstehend beschriebenen Kerbwirkungen unterliegt, ist in Fig. 1A stark schematisiert dargestellt. Das Modul 1 kann insbesondere als Gehäusemodul eines piezoelektrischen Aktors für ein Brennstoffeinspritzventil zum direkten Einspritzen von Brennstoff in einen Brennraum einer Brennkraftmaschine eingesetzt werden.An exemplary embodiment of a module 1, which can be used, for example, in a high-pressure fuel injection valve and which, due to its design, is subject to the notch effects described above, is shown in highly schematic form in FIG. 1A. The module 1 can be used in particular as a housing module of a piezoelectric actuator for a fuel injection valve for direct injection of fuel into a combustion chamber of an internal combustion engine.

Hierbei sind ein Kopfteil 2 und ein Fußteil 3 in ein rohrförmiges Gehäusebauteil 4 eingeschoben und durch jeweils eine Schweißnaht 5, 6 mit diesem verbunden.Here, a head part 2 and a foot part 3 are inserted into a tubular housing member 4 and connected by a respective weld 5, 6 with this.

Wie in Fig. 1B stark schematisiert dargestellt, treten bei Druckbelastungen, bei welchen das Gehäuse 4 durch einen Druck in einem Innenraum 10 beaufschlagt ist, axiale und radiale Kräfte auf. Der resultierende Krafttensor führt zu einer Verspannung des Kopfteils 2 und des Fußteils 3 relativ zum Gehäuse 4, wodurch es zu einem Überlastungsbruch 7 durch Kerbwirkung kommt. Das Gehäuse 4 reißt in diesem Bereich teilweise oder ganz ein, wodurch es zu einem Druckverlust und zu nachfolgenden Fehlfunktionen oder zur völligen Zerstörung der mit dem Modul 1 ausgestatteten Vorrichtung kommen kann.As shown in highly schematic form in FIG. 1B, axial and radial forces occur in the case of pressure loads in which the housing 4 is acted upon by pressure in an inner space 10. The resulting force tensor leads to a tension of the head part 2 and the foot part 3 relative to the housing 4, resulting in an overload breakage 7 by notch effect. The housing 4 tears in this area partially or completely, which can lead to a loss of pressure and subsequent malfunction or complete destruction of the device equipped with the module 1.

Die erfindungsgemäßen Maßnahmen zielen auf eine Verringerung der Kerbwirkung mit nachfolgender verbesserter Haltbarkeit der druckbelasteten Bauteile.The measures according to the invention are aimed at reducing the notch effect with subsequent improved durability of the components subject to pressure.

Konstruktive Maßnahmen sind dabei einerseits die Verlagerung der Stelle der höchsten Belastung aus der Schweißnaht 5, 6 und andererseits ein fließender, nahezu kerbfreier Übergang vom Schweißgut in die Wärmeeinflußzone und von dort in das Grundmaterial der Bauteile, verknüpft mit einer geeigneten Gestaltung der Bauteile im Bereich der Schweißnähte 5, 6.Constructive measures are on the one hand the displacement of the point of highest load from the weld 5, 6 and on the other hand a flowing, almost notch-free transition from weld metal into the heat affected zone and from there into the base material of the components, combined with a suitable design of the components in the Welds 5, 6.

Auch eine Verpressung der Fügepartner Gehäuse 4 und Kopf- bzw. Fußteil 2, 3 zusätzlich zur Verschweißung bringt eine Verbesserung der Kraftsituation mit sich. Die Verpressung setzt dem in radialer Richtung nach außen wirkenden Innendruck in dem Modul 1 eine Kraft in radialer Richtung nach innen entgegen und verhindert ein Aufblähen des Gehäuses 4. Die Schweißnähte 5, 6 versehen somit eine Dichtfunktion und sorgen gleichzeitig für die Aufnahme der an dieser Stelle auftretenden Axialkraft.Even a compression of the joining partner housing 4 and head or foot 2, 3 in addition to welding brings an improvement in the power situation with it. The compression sets the radially outwardly acting internal pressure in the module 1 against a force in the radial direction inwards and prevents inflation of the housing 4. The welds 5, 6 thus provide a sealing function and at the same time provide for receiving the at this point occurring axial force.

Wird also, wie in Fig. 2A und 2B stark schematisiert dargestellt, die Form der Fügepartner entsprechend gestaltet, kann einerseits der Bereich der größten Belastung entspannt werden, was zu einem erheblich geringeren Risiko eines Belastungsbruches 7 führt, und andererseits bei zuverlässiger Abdichtung die Krafteinleitung verteilt und ausgeglichen werden.If, as shown in highly schematic form in FIGS. 2A and 2B, the shape of the joining partners is correspondingly designed, on the one hand the region of the greatest load can be relaxed, which leads to a considerably lower risk of stress fracture 7, and On the other hand, with reliable sealing, the introduction of force is distributed and compensated.

Hierzu ist zunächst das Kopf bzw. Fußteil 2, 3, wie aus Fig. 2B ersichtlich, so geformt, daß die Krafteinleitung über einen umlaufenden Kragen 9 erfolgt, welcher bedingt durch seine innen zumindest teilgerundete Form wesentlich weniger anfällig für Belastungsbrüche 7 ist als die in Fig. 1B dargestellte kantige Form der Fügeteile (Vermeidung der Strukturkerbe).For this purpose, first the head or foot part 2, 3, as shown in Fig. 2B, shaped so that the force is applied via a circumferential collar 9, which is due to its inside at least partially rounded shape much less susceptible to stress fractures 7 than in Fig. 1B illustrated angular shape of the joining parts (avoiding the structural notch).

Weiterhin weisen Kopf und Fußteil 2, 3 jeweils einen umlaufenden, nach radial außen zum Gehäuse 4 orientierten Vorsprung 8 auf. Wird das Gehäuse 4 im Bereich dieses Vorsprungs 8 verpreßt, können die Schweißnähte 5, 6 druckentlastet werden, wodurch Ermüdungsbrüche 7 ebenfalls wirkungsvoll eingedämmt werden können.Furthermore, the head and foot part 2, 3 each have a circumferential, radially outwardly of the housing 4 oriented projection 8. If the housing 4 is pressed in the region of this projection 8, the welds 5, 6 can be depressurized, whereby fatigue fractures 7 can also be effectively contained.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt. Alle Merkmale der Erfindung sind beliebig miteinander kombinierbar. Jedes Merkmal für sich, also sowohl der Kragen 9, als auch die Verpressung, kann soweit druckentlastend wirken, daß die Konstruktion die Anforderungen erfüllt.The invention is not limited to the illustrated embodiment. All features of the invention can be combined with one another as desired. Each feature in itself, so both the collar 9, as well as the compression, can act as far pressure relieving that the construction meets the requirements.

Claims (8)

Modul (1) zur Verwendung unter Beaufschlagung mit einem Innendruck, mit einem Gehäuse (4), einem Kopfteil (2) und einem Fußteil (3), wobei das Kopfteil (2) und das Fußteil (3) über Schweißnähte (5, 6) mit dem Gehäuse (4) verbunden sind,
dadurch gekennzeichnet,
daß das Kopfteil (2) und das Fußteil (3) mit dem Gehäuse (4) jeweils verschweißt und verpreßt sind.Module (1) for use with an internal pressure, comprising a housing (4), a head part (2) and a foot part (3), the head part (2) and the foot part (3) being provided by welds (5, 6) are connected to the housing (4),
characterized,
that the head part (2) and the foot part (3) with the housing (4) are each welded and pressed. Modul nach Anspruch 1,
dadurch gekennzeichnet,
daß das Kopfteil (2) und das Fußteil (3) jeweils einen umlaufende Kragen (9) aufweisen.Module according to claim 1,
characterized,
that the head part (2) and the foot part (3) each have a circumferential collar (9). Modul nach Anspruch 2,
dadurch gekennzeichnet,
daß das Gehäuse (4) jeweils mit dem Kragen (9) des Kopf- und Fußteils (2, 3) verschweißt ist.Module according to claim 2,
characterized,
that the housing (4) in each case with the collar (9) of the head and foot part (2, 3) is welded. Modul nach Anspruch 2 oder 3,
dadurch gekennzeichnet,
daß der Kragen (9) innen zumindest teilweise gerundet ausgebildet ist.Module according to claim 2 or 3,
characterized,
that the collar (9) is formed inside at least partially rounded. Modul nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß an dem Kopf- und dem Fußteil (2, 3) jeweils ein radial außen umlaufender Vorsprung (8) ausgebildet ist.Module according to one of claims 1 to 4,
characterized,
that on the head and the foot part (2, 3) each have a radially outer circumferential projection (8) is formed. Modul nach Anspruch 5,
dadurch gekennzeichnet,
daß das Gehäuse (4) und das Kopf- und das Fußteil (2, 3) im Bereich des radial außen umlaufenden Vorsprungs (8) miteinander verpreßt sind.Module according to claim 5,
characterized,
that the housing (4) and the head and the foot part (2, 3) in the region of the radially outwardly circumferential projection (8) are pressed together. Modul nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß die Schweißnähte (5, 6) gegenüber einem Innenraum (10) des Moduls (1) druckentlastet sind.Module according to one of claims 1 to 6,
characterized,
that the weld seams (5, 6) against an interior (10) of the module (1) are pressure-relieved. Modul nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet,
daß der Innenraum (10) durch die Schweißnähte (5, 6) abgedichtet ist.Module according to one of claims 1 to 7,
characterized,
in that the interior space (10) is sealed by the weld seams (5, 6).
EP20060123335 2005-12-30 2006-11-02 Module with weld suited for high pressure Active EP1803930B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510063018 DE102005063018A1 (en) 2005-12-30 2005-12-30 Module with high pressure weld seam design

Publications (2)

Publication Number Publication Date
EP1803930A1 true EP1803930A1 (en) 2007-07-04
EP1803930B1 EP1803930B1 (en) 2009-02-11

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013013234A1 (en) * 2013-08-08 2015-02-12 Man Diesel & Turbo Se Injector for a fuel supply system of an internal combustion engine and fuel supply system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4403414A1 (en) * 1994-02-04 1995-08-10 Fass Busch Gmbh & Co Metal barrel and its manufacturing process
EP1126168A2 (en) * 2000-02-18 2001-08-22 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method of producing swash plate type compressor piston
JP2002340186A (en) * 2001-05-16 2002-11-27 Takuya Idogawa Can device
DE10254847A1 (en) * 2002-11-25 2004-02-12 Robert Bosch Gmbh Process for welding axial rotationally symmetrical welding seams comprises using a pulsed laser beam source, transforming the pulsed beam into a homogeneous ring using a lens, and focussing onto a workpiece
DE10310787A1 (en) * 2003-03-12 2004-09-23 Robert Bosch Gmbh Tubular spring for actuator of fuel injection valve for IC engine fuel injection system provided by 2 cooperating half shells
WO2005066486A1 (en) * 2004-01-12 2005-07-21 Siemens Aktiengesellschaft Piezo actuator comprising means for compensating thermal length modifications and fuel-injection valve comprising a piezo actuator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4403414A1 (en) * 1994-02-04 1995-08-10 Fass Busch Gmbh & Co Metal barrel and its manufacturing process
EP1126168A2 (en) * 2000-02-18 2001-08-22 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method of producing swash plate type compressor piston
JP2002340186A (en) * 2001-05-16 2002-11-27 Takuya Idogawa Can device
DE10254847A1 (en) * 2002-11-25 2004-02-12 Robert Bosch Gmbh Process for welding axial rotationally symmetrical welding seams comprises using a pulsed laser beam source, transforming the pulsed beam into a homogeneous ring using a lens, and focussing onto a workpiece
DE10310787A1 (en) * 2003-03-12 2004-09-23 Robert Bosch Gmbh Tubular spring for actuator of fuel injection valve for IC engine fuel injection system provided by 2 cooperating half shells
WO2005066486A1 (en) * 2004-01-12 2005-07-21 Siemens Aktiengesellschaft Piezo actuator comprising means for compensating thermal length modifications and fuel-injection valve comprising a piezo actuator

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DE102005063018A1 (en) 2007-07-05
DE502006002806D1 (en) 2009-03-26
EP1803930B1 (en) 2009-02-11

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