WO2017016916A1 - Beschichtetes formteil und verfahren zur herstellung eines beschichteten formteils - Google Patents
Beschichtetes formteil und verfahren zur herstellung eines beschichteten formteils Download PDFInfo
- Publication number
- WO2017016916A1 WO2017016916A1 PCT/EP2016/067061 EP2016067061W WO2017016916A1 WO 2017016916 A1 WO2017016916 A1 WO 2017016916A1 EP 2016067061 W EP2016067061 W EP 2016067061W WO 2017016916 A1 WO2017016916 A1 WO 2017016916A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molding
- molded part
- intermediate step
- coated
- partially
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
- B22F3/1025—Removal of binder or filler not by heating only
-
- 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
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
- B22F2003/242—Coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- 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
- F02M2200/8046—Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal
Definitions
- the present invention relates to a coated molding and a method for
- a coated molded part wherein the coated molded part is installed in the finished state, for example in a solenoid valve, which in turn forms part of an injection system for fuel injection in an internal combustion engine.
- a central component of these solenoid valves forms the valve needle, at one end of an anchor portion is arranged.
- the armature section is exposed to loads which are generally caused by striking the inner pole and by the guided movement of the valve needle.
- the wear resistance of the material from which the anchor portion is made is insufficient to guarantee a preferably long life.
- the prior art knows as a coating of the armature section chrome plating, which also serve as a residual air gap to reduce magnetic sticking. In order to realize ceramic coatings, so far only plasma processes are known in which complex reworking is usually required. Disclosure of the invention
- the object is achieved by a method for producing a coated molding, in particular a coated molding for a solenoid valve, for example, for an anchor portion of a valve needle in a solenoid valve.
- the molding is injection-molded for shaping in a first process step and sintered for solidification in a second process step performed temporally after the first process step, wherein the molding is timed between the first process step and the second process step.
- rens intimid ie between injection molding and sintering, in a first intermediate step with a material comprising a ceramic suspension material is at least partially coated.
- the inventive method has the advantage that by coating with the material comprising the ceramic suspension, and the subsequent sintering, a ceramic layer is formed which is resistant to wear and magnetically non-conductive and thus, for example, the comparatively superior claim profile for the load an anchor section in the solenoid valve is fair.
- a cohesive connection between the molded part and its coating is achieved in particular by sintering without much effort, without reworking is required.
- the first method step and the second method step are part of a "metal injection molding” method and the coating takes place in the context of this "metal injection molding” method, ie. H. Coating is part of the "Metal Injection Molding" process
- one or more functional surfaces for which special loads are expected or are to be expected in the finished molded part, to be coated but also conceivable according to the invention that the molding is completely coated.
- the molded part is released in a second intermediate step taking place between the first and second method step, wherein
- the first intermediate step and the second intermediate step are performed simultaneously.
- the debinding ie the dissolution of a binder, in particular an organic binder, without affecting the shape and chemical purity of the injection-molded molded part, adapted to the respective binder takes place.
- debinding is accomplished by liquid phase debindering or solvent debindering.
- the brown part or the Braunlings ie by the coating time after debinding, which can Ceramic material penetrate comprehensive material in the open-pore Braunling and thereby enter into an additional positive connection with the molding after sintering in an advantageous manner.
- the molding is thermally debindered, wherein - the first intermediate step in time before the second and the third intermediate step or
- the molding is at least partially injection molded from a magnetic material. This makes it possible to realize a magnetic component that can be integrated, for example, in a solenoid valve.
- the molding is at least partially coated in the first intermediate step by means of dipping and / or screen printing.
- the coating can be applied to the Braunling and / or the green product in a simple and uncomplicated manner.
- the ceramic suspension is a zirconium-containing ceramic suspension, in particular a Zr0 2 -Kearmik.
- ZrO 2 zirconium oxide
- the molded part is hot isostatically sintered in a third method step carried out after the second method step.
- hot isostatic pressing the molding is post-compacted to reduce the proportion of pores in the structure of the molding to about 1%.
- Another object of the present invention is a coated molding, preferably a molding for a solenoid valve and particularly preferably an anchor portion of a valve needle of a solenoid valve, wherein the coated molding is at least partially produced by injection molding and subsequent sintering, wherein the molding at least partially a temporally coated prior to sintering comprising a ceramic suspension.
- chromium plating is dispensed with and, instead, a ceramic is used as the coating, the ceramic coating being formed by the sintering taking place in any case.
- the coating of the molded part according to the invention takes place, in particular, in the context of a "metal injection molding” process, thereby providing a protective coating which is suitable in particular for molded parts or functional surfaces of the molded parts in a magnetic valve.
- the molding is at least partially timed before or after debindering, i. H. on the present as green part or as Braunling molding, coated coating comprising a ceramic suspension has.
- coated coating comprising a ceramic suspension has.
- the molded part and the coating have a cohesive and positive fit with one another.
- the molded part comprises a magnetic material.
- the coated molded part is a part of an anchor portion of a valve needle or the anchor portion of a valve needle in a solenoid valve.
- Figure 1 shows schematically a solenoid valve for fuel injection with an anchor portion of a valve needle according to an exemplary embodiment of the vorlie invention.
- FIG. 2 shows in detail a valve needle of the solenoid valve according to the exemplary embodiment of the present invention.
- FIG. 3 shows in detail a coated molding in the form of an anchor portion of the valve needle of the solenoid valve according to the exemplary embodiment of the present invention.
- the solenoid valve 101 shown by way of example in FIG. 1 in the form of an injection valve for a fuel injection system, for example for mixture-compression spark-ignited internal combustion engines, has a core 20 surrounded by a magnetic coil 1 serving as a fuel inlet nozzle.
- the magnet coil 1 with a coil former 3 is e.g. B. provided with a Kunststoffumspritzung 5, wherein at the same time an electrical connector 6 is mitangespritzt.
- a lower core end 10 of the core 20 is concentric with a valve longitudinal axis 1 1 tightly connected a tubular intermediate metal part 12, for example by welding and engages over it with an upper cylinder portion 14, the Ker- nende 10 partially axially.
- the bobbin 3 partially overlaps the core 20 and the upper cylinder portion 14 of the intermediate part 12.
- the intermediate part 12 is provided at its end facing away from the core 20 with a lower cylinder portion 18 which engages over a tubular nozzle carrier 19 and is tightly connected thereto, for example by welding , In the downstream end of the nozzle carrier 19 is in a concentric with the valve longitudinal axis 1 1 extending through hole 20 ', a cylindrical valve seat body 21 is tightly mounted by welding.
- valve seat body 21 The valve seat body 21, the solenoid coil 1 facing a fixed valve seat 22, downstream of the valve seat body 21 z.
- B. two spray openings 23 are. Downstream of the spray-discharge openings 23, the valve-seat body 21 has a processing bore 24 widening in a truncated-cone shape in the flow direction.
- a tubular adjusting bushing 27 is pressed.
- the return spring 26 bears with its one end on a valve seat body 21 facing the lower end face 28 of the adjusting bush 27.
- the offset of the adjusting bushing 27 into the flow bore 25 of the core 20 determines the spring force of the return spring 26 and thus also influences the dynamic fuel quantity indicated during the opening and closing strokes of the valve.
- the return spring 26 With its adjusting bush 27 facing away from the end, the return spring 26 is supported on a retaining shoulder 30 of a tubular, z. B. concentric with the valve longitudinal axis 1 1 arranged actuating part 32 from.
- the actuating part 32 has a longitudinal opening 34 which, facing the core 20, merges into the retaining shoulder 30.
- a valve needle 58 according to the embodiment shown in FIG. 1 is also shown in Fig. 2.
- the tubular actuating member 32 consists of a tubular, facing the core 20 and cooperating with the core 20 and the solenoid coil 1 anchor portion 36 and the valve seat body 21 facing extending tubular valve sleeve portion 38. Near its end facing away from the anchor portion 36 39 is in the longitudinal opening 34 of the operating part 32, a bottom 40 is formed.
- the bottom 40 divides the longitudinal opening 34 of the actuating part 32 into a blind hole-shaped flow section 42 facing the core 20, forming an extension of the flow bore 25 of the core 20, and a blind hole section 44 having only a small axial extent compared to the flow section 42 the valve sleeve section 38 is the actuation part 32 with a z.
- spherical valve closure member portion 46 connected by a welded joint 48.
- the valve sleeve portion 38 of the actuating member 32 has at its end 39 facing away from the holding shoulder 30 a frontal, z. B.
- Valve sleeve portion 38 and valve closure member portion 46 are generally smaller in diameter than the armature portion 36.
- the example spherical valve closure member portion 46 has at its periphery z. B. four flats 50, the flow of the combustion Stoffs in the direction of the valve seat 22 of the valve seat body 21 facilitate.
- a cavity 52 is formed, in which in the manufacture of the welded joint 48 z. B. accumulate by means of laser welding spatter. These spatters can not escape from the cavity 52 and z. B. get to the valve seat 22, so that the function of the valve is not disturbed.
- a plurality of through the wall of the valve sleeve section 38 passing through openings 56 is provided. These openings 56 allow a flow of the fuel through the flow bore 25 of the core 20 and through the longitudinal opening 34 of the actuating member 32 in the direction of the valve seat 22 of the valve seat body 21.
- the consisting of the anchor portion 36 and the valve sleeve portion 38 operating part 32 and possibly also the valve closing member section 46 of the valve needle 58 are made by injection molding and subsequent sintering. This process, which is also referred to as metal injection molding (MIM), comprises the production of shaped parts 66, such as the molded part 66 shown in FIG.
- MIM metal injection molding
- Binders e.g. As a plastic binder, for example, on conventional plastic injection molding machines, and the subsequent removal of the binder and sintering of the remaining metal powder scaffold.
- the composition of the metal powder can be tuned in a simple manner to optimum magnetic properties of the armature section 36 and the valve sleeve section 38 existing actuating part 32 or the valve closing member section 46. Sulfur and / or carbon in the metal powder, which adversely affect any weld 48 between valve closure member portion 46 and valve sleeve portion 38, can be avoided.
- the metal powder is mixed with the plastic used as a binder in a mixing device and homogenized.
- This mixture is then processed in a granulator to a granulate and further processed in a conventional manner by means of a plastic injection molding machine to form a molding 66.
- the components of the plastic binder are then removed by thermal processes, for example under the influence of inert gas.
- the remaining material framework of the molding 66 is now about 60 percent by volume of metal.
- the molded part 66 is sintered, for example under the influence of inert gas, in a sintering device.
- the sintering process can but also be carried out under the influence of hydrogen or in a vacuum.
- the molded part 66 can then be densified by hot isostatic pressing in order to reduce the proportion of pores in the structure of the molded part 66 (ie the later armature section 36, the later operating part 32 and the later valve needle 58) to about 1%.
- the armature section 36 of the valve needle 58 of the solenoid valve 101 is shown in detail as an example of a molded part 66 according to the exemplary embodiment of the present invention, as illustrated in FIGS. 1 and 2.
- the anchor portion 36 that is, the molded part 66 or a part of the valve needle 58
- the armature section 36 and thus the molded part 66 are coated in areas which are exposed to increased stresses in relation to other areas on the armature section 36, which are caused, for example, by impacts occurring during operation of the solenoid valve 101 or the guidance of the armature section 36.
- the molded part 66 or the anchor portion 36 is at least partially injection molded in the sense of the metal injection molding (MIM) process in a first molding process step and in a second process step for consolidating or solidifying the injection molded anchor portion 36 (or molding 66) is sintered.
- Coating with a material 2 comprising a ceramic suspension is preferably carried out in a first intermediate step between the first and the second method step, ie, between injection molding and sintering. It is conceivable that the coating is realized by means of dipping or screen printing.
- the molding 66 or the anchor portion 36 which is preferably at least partially injection molded from a magnetic material in the first process step, formed with the subsequent sintering a cohesively bonded to the molding 66 and the anchor portion 36 ceramic layer in Advantageously wear resistant and magnetically non-conductive. It is further provided that in a time between the first step and the second process step performed second intermediate step, the molding 66 is debinded.
- the second intermediate step is performed prior to the first intermediate step and / or the second intermediate step is performed after the first intermediate step, ie. H. it will be the Braunling and / or the
- the material 2 comprising the ceramic suspension can penetrate into the open-pored Braunling and thereby advantageously way to form an additional positive connection. It proves to be particularly advantageous that the MIM method, a complex structure can be realized, which in turn can be coated completely or partially without much effort. In particular, the sintering in the second method step realizes a material-coherent connection, which enables an essentially stress-free coating.
- the MIM method in which the at least partially coating is interposed as the first intermediate step, on cost-intensive and inaccurate methods for coating moldings 66, in particular the anchor parts or anchor portions 36 for solenoid valves 101, such as a plasma process , to renounce.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Powder Metallurgy (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020187002106A KR102491213B1 (ko) | 2015-07-24 | 2016-07-18 | 코팅된 성형품 및 코팅된 성형품의 제조 방법 |
JP2018503583A JP6529060B2 (ja) | 2015-07-24 | 2016-07-18 | 被覆加工された成形体、及び、被覆加工された成形体を製造する方法 |
CN201680043530.1A CN107848030B (zh) | 2015-07-24 | 2016-07-18 | 覆层的成形件和用于制造覆层的成形件的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015213994.8A DE102015213994A1 (de) | 2015-07-24 | 2015-07-24 | Beschichtetes Formteil und Verfahren zur Herstellung eines beschichteten Formteils |
DE102015213994.8 | 2015-07-24 |
Publications (1)
Publication Number | Publication Date |
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WO2017016916A1 true WO2017016916A1 (de) | 2017-02-02 |
Family
ID=56418523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2016/067061 WO2017016916A1 (de) | 2015-07-24 | 2016-07-18 | Beschichtetes formteil und verfahren zur herstellung eines beschichteten formteils |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP6529060B2 (de) |
KR (1) | KR102491213B1 (de) |
CN (1) | CN107848030B (de) |
DE (1) | DE102015213994A1 (de) |
WO (1) | WO2017016916A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017206638A1 (de) | 2017-04-20 | 2018-10-25 | Robert Bosch Gmbh | Verfahren zum Herstellen eines beschichteten Formteils |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009005528A1 (de) * | 2009-01-20 | 2010-07-22 | Albonair Gmbh | Zweistoffdüse |
US20130052415A1 (en) * | 2011-08-30 | 2013-02-28 | Andrew J. Burns | Method of forming a thermal barrier coating system with engineered surface roughness |
DE102011089240A1 (de) * | 2011-12-20 | 2013-06-20 | Robert Bosch Gmbh | Brennstoffeinspritzventil und Verfahren zur Ausformung von Abspritzöffnungen |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0551609A (ja) * | 1991-08-27 | 1993-03-02 | Kawasaki Steel Corp | 表面性状に優れた射出成形による粉末焼結体の製造方法 |
JPH08165503A (ja) * | 1994-12-12 | 1996-06-25 | Olympus Optical Co Ltd | 連結体の製造方法 |
WO2005029515A1 (ja) * | 2003-09-17 | 2005-03-31 | Hitachi Powdered Metals Co., Ltd. | 焼結可動鉄心およびその製造方法 |
DE102008042065A1 (de) * | 2008-09-12 | 2010-03-25 | Robert Bosch Gmbh | Verfahren zur Herstellung eines Bauteiles aus einem Werkstoffverbund und Bauteil aus einem Werkstoffverbund |
DE102008042047A1 (de) * | 2008-09-12 | 2010-03-18 | Robert Bosch Gmbh | Verfahren zur Herstellung von Gegenständen aus pulvermetallurgischen Werkstoffen |
-
2015
- 2015-07-24 DE DE102015213994.8A patent/DE102015213994A1/de active Pending
-
2016
- 2016-07-18 CN CN201680043530.1A patent/CN107848030B/zh active Active
- 2016-07-18 JP JP2018503583A patent/JP6529060B2/ja active Active
- 2016-07-18 KR KR1020187002106A patent/KR102491213B1/ko active IP Right Grant
- 2016-07-18 WO PCT/EP2016/067061 patent/WO2017016916A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009005528A1 (de) * | 2009-01-20 | 2010-07-22 | Albonair Gmbh | Zweistoffdüse |
US20130052415A1 (en) * | 2011-08-30 | 2013-02-28 | Andrew J. Burns | Method of forming a thermal barrier coating system with engineered surface roughness |
DE102011089240A1 (de) * | 2011-12-20 | 2013-06-20 | Robert Bosch Gmbh | Brennstoffeinspritzventil und Verfahren zur Ausformung von Abspritzöffnungen |
Also Published As
Publication number | Publication date |
---|---|
JP6529060B2 (ja) | 2019-06-12 |
DE102015213994A1 (de) | 2017-01-26 |
KR20180031689A (ko) | 2018-03-28 |
CN107848030B (zh) | 2021-05-28 |
KR102491213B1 (ko) | 2023-01-26 |
CN107848030A (zh) | 2018-03-27 |
JP2018524477A (ja) | 2018-08-30 |
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