EP3737852A1 - Sitzplatte für einen injektor und verfahren zur herstellung einer solchen sitzplatte - Google Patents
Sitzplatte für einen injektor und verfahren zur herstellung einer solchen sitzplatteInfo
- Publication number
- EP3737852A1 EP3737852A1 EP19701609.0A EP19701609A EP3737852A1 EP 3737852 A1 EP3737852 A1 EP 3737852A1 EP 19701609 A EP19701609 A EP 19701609A EP 3737852 A1 EP3737852 A1 EP 3737852A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flat side
- plate
- seat plate
- insulating coating
- passage
- 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.)
- Pending
Links
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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1853—Orifice plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/166—Selection of particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
Definitions
- the present invention relates to a seat plate for an injector and a method for manufacturing such a seat plate.
- fuel is usually injected via an injector with a certain amount and for a certain period of time into a combustion chamber. Due to the very low injection durations, which are in the microsecond range, it is necessary to open or close the outlet opening of the injector at a very high frequency. For an accurate control of these closing times and to accurately detect an injector state, it is necessary to provide an injector state detection so that a higher-level control unit receives all information relating to a single injector, in particular information regarding its closing or opening times.
- Such an injector typically has a nozzle needle (also called an injector needle) which allows a fuel subjected to a high pressure to leak out on release of an exit hole of the injector.
- This nozzle needle acts in conjunction with this outlet opening like a plug, which allows for a lifting of a leakage of the fuel. Accordingly, it is therefore necessary to lift this needle in relatively short time intervals and to let slide back into the outlet opening after a short time.
- hydraulic servo valves can be used, which control the triggering of this movement.
- Such valves in turn are controlled by means of an electromagnet.
- a piezoelectric element can be used which reacts faster than the valve actuated by means of electromagnets.
- servo valves which control the nozzle needle and are controlled by a solenoid valve or piezo valve itself.
- a pressure level which acts on the nozzle needle in the closing direction is established in a control space acting together with the nozzle needle by means of the fuel which is available under high pressure.
- This control chamber is typically connected via an inlet throttle to the high-pressure region of the fuel.
- this control chamber has a small closable outlet throttle, from which the fuel can escape. If this is done, the pressure in the control chamber and the closing force acting on the nozzle needle are reduced because the high-pressure fuel of the control chamber can flow off. This leads to a movement of the nozzle needle, which releases the outlet opening at the injector tip.
- the outlet throttle of the valve is thus optionally closed or opened by means of an anchor element. Since the general principle of an injector for injecting fuel is known to those skilled in the art, the functionality of this component will not be discussed in more detail. As already briefly mentioned above, the injector state detection is of great importance for a controlled operation of the injector. In previous injectors, it is not necessary or very expensive to provide a seat plate of the injector, which is electrically isolated from the injector and current passes through certain locations, so that the control valve arranged underneath and the nozzle needle are connected to the injector coil arranged above.
- the seat plate of the injector is therefore a component which is used both as a contact element to an injector coil and as an insulator to the injector. Further, the seat plate includes a top-to-bottom passage, which is the drainage throttle of an injector.
- the underlying control chamber fills via an inlet with high pressure stored fuel, so that the nozzle needle is urged into its closed position.
- the fuel stored under high pressure flows off and reduces the force acting on the nozzle needle force influence, so that it lifts off from their outlet openings and thereby fuel can escape.
- the seat plate according to the invention for an injector comprises a plate-like base body with a first flat side, a second flat Side and one or more circumferential end faces, a passage which extends through the plate-like base body from the first flat side to the second flat side, and an insulating coating, the entire surface on all peripheral faces and, with the exception of one or more continuous insulating coating-free areas , Whole area is arranged on one of the two flat sides of the plate-like base body, wherein the plate-like base body consists of an electrically conductive material.
- the passage which extends through the plate-like base body from the first flat side toward the second flat side, may be formed as an outlet throttle, which may constitute an outlet for fuel stored in a control chamber under high pressure. Fuel is discharged upwards, so that the downward pressure of the control chamber decreases.
- the plate-like base body made of hard metal, since this material is easy to process and has sufficient electrical conductivity for the present purposes of the invention.
- the insulating coating is a diamond-like carbon layer, that is, a DLC layer.
- DLC stands for "diamond-like carbon”.
- the invention also includes that several thin DLC layers are applied to the corresponding areas of the seat plate.
- the advantages of using a DLC coating are its extreme hardness, high abrasion resistance and low coefficient of friction.
- the serves are a diamond-like carbon layer.
- the insulating coating-free contiguous region forms an exposed surface of the base body on the coated flat side.
- the insulating coating-free area is not covered with other layers but exposes the surface of the body unprotected.
- the insulating coating is preferably designed to prevent electrical conductivity.
- the contiguous, insulating coating-free area on the coated flat side rotationally symmetrical to a centrally through the passage extending axis of rotation, wherein preferably the continuous insulating coating-free area is circular. It is ensured that the functionalities of the seat plate according to the invention are achieved independently of a particular location during installation. No cylindrical pins or similar alignment means are needed to electrically interconnect the above and below components. This is due to the rotationally symmetrical configuration of the insulating coating-free region regardless of a rotation about the associated axis of rotation.
- the plate-like base body is rotationally symmetrical to a rotation axis extending centrally through the passage.
- the plate-like base body may also be rotationally symmetrical to a center of rotation passing through the passage.
- the insulating coating with the exception of the insulating coating-free, contiguous region, is arranged over the entire flat side, including the surface exposed due to the passage, which faces the coated flat side.
- each surface with the exception of a flat side, including the exposed due to the passage surface facing the uncoated flat side, and a contiguous area on the other flat side with the Insulating coating is provided.
- the passage on one of the two flat sides has a smaller opening than on the other flat side, and is preferably an outlet throttle of an injector.
- the insulating coating-free, contiguous area encloses the passage opening on the coated flat side, preferably adjacent to a through-opening on the coated flat side.
- the present invention relates to a method for producing a seat plate according to one of the variants listed above, wherein in the method, the plate-shaped base body is provided with an insulating coating, the passage is at least partially created by laser drilling, and the insulating coating-free, contiguous area on the coated flat side is performed by removing the insulating coating by means of the laser for laser drilling.
- the passage is a throttle, it is advantageous if the holes are drilled by laser, as this reduces the throttle flows more and the energy efficiency can be improved. This is advantageous in terms of the manufacturing costs of the seat plate, especially especially when the insulating coating-free, contiguous area is also created by removing an insulating coating by means of a laser for laser drilling.
- a further advantageous development of the method results when sandblasted before being provided with an insulating coating of the plate-shaped body, glass bead blasting and / or sliding, especially in an edge region of the body. This serves for better layer adhesion, in particular in the edge region and reduces the wear of the seat plate.
- a transition region from a flat side of the seat plate to an end face is considered as an edge region.
- the invention also relates to an injector with a seat plate according to one of the variants described above.
- Fig. 1 a side view of a seat plate according to the invention
- Fig. 2 is a plan view of the seat plate according to the invention.
- FIG. 3 a section on a cross section through the seat plate, which extends through the axis of rotation of the passage of the seat plate.
- FIG. 1 shows the seat plate 1 in a side view.
- the approximately plate-shaped body 2 has an upper surface side 3 and a lower surface side 4.
- the end faces 5 of the plate-like base body 2 connect the upper and the lower flat side 3, 4 of the main body 2 with each other.
- a dash-dotted representation areas of the base body 2 which are provided with an insulating coating 7 for electrically insulating the base body 2.
- the lower surface side 4 is free from the insulating coating.
- several contiguous areas on the first surface side may be free of insulating coating.
- FIG. 2 shows a plan view of the first planar side 3 of the seat plate 1. It can be seen that the insulating coating-free, coherent region 8 is bounded by an inner and an outer boundary which extend in a circle around the passage 6. In other words, the region 8 is rotationally symmetrical with respect to a straight line passing through the passage in the middle, which in the illustration according to FIG. 2 rises vertically from the plane of the page. Due to the rotationally symmetrical configuration of the region 8, no specific rotation of the seat plate 1 must be made during installation in order to achieve the advantageous functionality achieved with the invention.
- FIG. 3 shows the part of a cross section which runs through the passage 6 and its axis of rotation R.
- the passage has a point with the smallest diameter, which is used as an outlet throttle.
- the space which is approximately frusto-conical, forms part of a control space for receiving fuel under high pressure.
- the control chamber is typically sealed or opened by means of an electromagnet-controllable anchor element. If the throttle is open, can flow out of the control chamber under high pressure fuel, so that a closing the outlet opening needle is applied with less pressure and opens the outlet openings.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018101341 | 2018-01-22 | ||
DE102018101351.5A DE102018101351A1 (de) | 2018-01-22 | 2018-01-22 | Sitzplatte für einen Injektor und Verfahren zur Herstellung einer solchen Sitzplatte |
PCT/EP2019/051446 WO2019141863A1 (de) | 2018-01-22 | 2019-01-22 | Sitzplatte für einen injektor und verfahren zur herstellung einer solchen sitzplatte |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3737852A1 true EP3737852A1 (de) | 2020-11-18 |
Family
ID=67145072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19701609.0A Pending EP3737852A1 (de) | 2018-01-22 | 2019-01-22 | Sitzplatte für einen injektor und verfahren zur herstellung einer solchen sitzplatte |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3737852A1 (de) |
DE (1) | DE102018101351A1 (de) |
WO (1) | WO2019141863A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020108668A1 (de) | 2020-03-30 | 2021-09-30 | Liebherr-Components Deggendorf Gmbh | Nadelhubschalter und Kraftstoffinjektor mit einem solchen Nadelhubschalter |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1175559B1 (de) * | 1999-04-27 | 2006-04-12 | Siemens VDO Automotive Corporation | Brennstoffeinspritzventilsitz mit einer scharfen kante |
JP2004028051A (ja) * | 2002-06-28 | 2004-01-29 | Denso Corp | 燃料噴射ノズルおよびその製造方法 |
US20050242212A1 (en) * | 2004-04-30 | 2005-11-03 | Chapaton Thomas J | Injector with fuel deposit-resistant director plate |
DE102005015425A1 (de) * | 2005-04-04 | 2006-10-05 | Siemens Ag | Einspritzventil |
US8006715B2 (en) * | 2007-09-20 | 2011-08-30 | Caterpillar Inc. | Valve with thin-film coating |
DE102007051408A1 (de) * | 2007-10-25 | 2009-05-28 | Prelatec Gmbh | Verfahren zum Bohren von Löchern definierter Geometrien mittels Laserstrahlung |
EP2067983B1 (de) * | 2007-12-04 | 2014-07-16 | Continental Automotive GmbH | Ventilanordnung für ein Einspritzventil und Einspritzventil |
DE102008020468B4 (de) * | 2008-04-23 | 2011-09-15 | Auctio Gmbh | Verfahren zur Beschichtung von Oberflächen mit einer elektrisch leitfähigen diamantähnlichen Schicht, elektrisch leitfähige diamantähnliche Schicht, hergestellt durch das Verfahren, Werkstück mit der nach dem Verfahren hergestellten elektrisch leitfähigen diamantähnlichen Schicht, Verfahren zur Herstellung des Werkstücks mit der elektrisch leitfähigen diamantähnlichen Schicht und Verfahren zur Bestimmung der Position des Werkstücks |
DE102011016168B4 (de) * | 2011-04-05 | 2015-02-12 | L'orange Gmbh | Kraftstoffinjektor für eine Brennkraftmaschine |
DE102012212614A1 (de) * | 2012-07-18 | 2014-01-23 | Continental Automotive Gmbh | Piezoinjektor mit hydraulisch gekoppelter Düsennadelbewegung |
US9845779B2 (en) * | 2014-06-26 | 2017-12-19 | Continental Automotive Systems, Inc. | Coated high pressure gasoline injector seat to reduce particle emissions |
GB2542782B (en) * | 2015-09-29 | 2018-01-17 | Delphi Int Operations Luxembourg Sarl | Fuel Injection Nozzle with a Conductor Assembly in a Piston Guide |
EP3436683B1 (de) * | 2016-04-01 | 2020-12-02 | Delphi Technologies IP Limited | Kraftstoffeinspritzer |
FR3050770B1 (fr) * | 2016-04-29 | 2019-12-20 | Delphi Technologies Ip Limited | Injecteur de carburant |
DE102017116383A1 (de) | 2017-07-20 | 2019-01-24 | Liebherr-Components Deggendorf Gmbh | Injektor zum Einspritzen von Krafstoff |
-
2018
- 2018-01-22 DE DE102018101351.5A patent/DE102018101351A1/de active Pending
-
2019
- 2019-01-22 WO PCT/EP2019/051446 patent/WO2019141863A1/de unknown
- 2019-01-22 EP EP19701609.0A patent/EP3737852A1/de active Pending
Also Published As
Publication number | Publication date |
---|---|
DE102018101351A1 (de) | 2019-07-25 |
WO2019141863A1 (de) | 2019-07-25 |
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Legal Events
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Effective date: 20200813 |
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