EP2307699A1 - Solenoid valve for a fuel injector and fuel injector - Google Patents
Solenoid valve for a fuel injector and fuel injectorInfo
- Publication number
- EP2307699A1 EP2307699A1 EP09772227A EP09772227A EP2307699A1 EP 2307699 A1 EP2307699 A1 EP 2307699A1 EP 09772227 A EP09772227 A EP 09772227A EP 09772227 A EP09772227 A EP 09772227A EP 2307699 A1 EP2307699 A1 EP 2307699A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solenoid valve
- magnetic core
- fuel
- coil
- valve 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
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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
- F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
-
- 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
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
-
- 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
-
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
Definitions
- the invention relates to a solenoid valve, in particular a servo valve, for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine according to the preamble of claim 1 and a fuel injector according to claim 11.
- the fuel injector known from DE 10 2004 013 239 A1 comprises a solenoid valve designed as a servo valve for controlling the fuel pressure in a control chamber of the fuel injector. Via the fuel pressure in the control chamber, a stroke movement of an injection valve element is controlled, with which an injection opening of the fuel injector is opened or closed.
- the solenoid valve comprises a magnetic assembly having an electrical coil and a magnet armature which, when the magnet assembly is energized, is adjusted in the direction of the magnet assembly and is spring-loaded in the closing direction when the magnet assembly is not energized by means of a valve closing spring.
- the Abêtmenge is receiving a valve closing spring receiving Center bore guided centrally through the magnetic core to injector return port.
- the invention is therefore based on the object to propose an alternative Native solenoid valve, which is provided in a simple manner at least one fuel return passage with uncritical cross-sectional area. Furthermore, the object is to propose a fuel injector with a correspondingly optimized solenoid valve.
- the invention is based on the idea to form at least one of the axial, in the prior art cross-section of each a coil dome filled through holes in the magnetic core for the coil contact pins as fuel return passage through which fuel can flow in the direction of an injector return port with the solenoid valve open.
- An embodiment is preferred in which both passage openings for the coil contact pins (connecting pins) are designed as fuel return channels, that is to say with a cross-section widened in comparison with the prior art, in order to thus achieve a symmetrical flow pattern.
- fuel return ducts formed on and in addition to the passage openings are formed by axial grooves formed on the outer circumference of the magnetic core and receive no spin contact pins, so that when the solenoid valve is open the fuel is essentially exclusively supplied by at least one of the in each case one coil contact pin receiving through holes in the magnetic core in the direction injector return port can flow.
- at least one passage opening receiving a bobbin contact pin as a fuel return passage, fuel return passage cross sections which are sufficiently large and selectable over a wide range can be realized in a surprisingly simple manner which may have a positive effect on the characteristic map and the counterpressure sensitivity of the solenoid valve, in particular because the pressure difference between the pressure above and below the magnetic core can be better controlled.
- the diameter-enlarged, fuel return passages forming through holes for the coil contact pins can be introduced into the magnet core at no extra cost, in particular can be pressed into a green compact for a subsequent sintering process.
- This also has a positive effect on a possibly used for use pressing tool for the magnetic core, since this is more stable due to the larger compared to the prior art, to be produced fürgangsö Maschinensquerroughe.
- the solenoid valve greater freedom to distribute the fuel return channel cross-section against a support body provided for the magnetic core bearing surface, with the result that the inner circumference of the support body can be narrower, ie designed with a smaller diameter.
- each a coil contact pin receiving through holes preferably all through holes, either completely disposed in a region radially outside the axial projection surface of the magnet armature, or from a region radially inward to radially outward in extends an area outside the axial projection surface of the armature.
- a coil contact pin having a fuel return passage and forming a passage opening in a region radially outward of the axial projection surface of the stop disc is arranged or extends at least in a region radially outside this.
- a maximum flow cross-section of the at least one fuel return channel can be achieved by the at least one through-hole penetrated by a Spulentrustpin is guided radially outward to the outer periphery of the magnetic core, so that of the passage opening partially restricted fuel return passage radially outward of the, in particular sleeve-shaped, carrier body is limited.
- the at least one passage opening forming the fuel return passage does not extend radially to the outer circumference of the magnetic return passage. kerns, so that the passage opening or the fuel return passage is bounded radially outwardly of the magnetic core.
- the latter embodiment has the advantage that a peripherally closed axial bearing surface for the magnetic core can be provided on the carrier body.
- a spool lendom is arranged in the penetrated by a SpulenAuthpin through holes, in which the associated Spulentitlepin is also included in sections.
- the coil dome preferably extends from the annular coil receiving in the axial direction and encapsulates the Spulen candypin sections in itself.
- the maximum circumferential extent of the at least one passage opening forming the fuel return passage corresponds at least approximately to the maximum circumferential extent of a through-hole which passes through the passage opening.
- a fuel return passage can be achieved with much smaller circumferential extent, whereby a total of a larger contact surface of the magnetic core can be provided on the carrier body.
- the cross-sectional area of the passageway can be adjusted by the choice of the radial extent of the passageway.
- the minimum cross-sectional area of the at least one fuel return channel ie the cross-sectional area
- the cross-sectional area is closest Range of the fuel return channel at least 8 mm 2 , in particular at least 9 mm 2 , preferably at least 10 mm 2 , more preferably at least 11 mm 2 , more preferably at least 12 mm 2 , so as to realize a generous outflow volume flow.
- an embodiment of the solenoid valve is preferred in which the armature does not abut directly against the magnet core, but against a stop disk (residual air disk) resting against the magnet core.
- it makes sense to further divert the Ab Kunststoffmenge by at least one Spulentitlepin passage opening in the axial direction to the injector return, since the stopper plate hydraulically obstructs a central through hole in the magnetic core usually open solenoid valve.
- the axial contact surface of the magnetic core on the carrier body is greater than 30 mm 2 .
- the carrier surface on which the magnetic core can be supported on the carrier body is formed by an inner annular shoulder of the carrier body.
- the support surface is preferably greater than 40 mm 2 , preferably greater than 50 mm 2 , particularly preferably greater than 60 mm 2 .
- the invention also relates to a fuel injector for injecting fuel into a combustion chamber of a combustion engine. engine with a, in particular as a servo valve ⁇ nenden, designed according to the concept of the invention solenoid valve.
- the solenoid valve is characterized in that at least one passage opening receiving a coil contact pin is designed as a fuel return passage.
- each a coil contact pin on ⁇ receiving through openings are each formed as a fuel return passage.
- 1 is a schematic representation of a trained as a servo valve solenoid valve for a fuel injector
- Fig. 2 is a perspective view of the magnet assembly of the solenoid valve of FIG. 1 and
- Fig. 3 shows a magnetic assembly of an alternative magnetic ⁇ valve in a view of the pole faces.
- FIG. 1 shows an incomplete and schematic illustration of a magnetic valve 1 for a fuel injector not shown in any more detail, known per se, for example as described in DE 10 2004 013 239 A1, for injecting fuel into a combustion chamber of an internal combustion engine shown.
- the solenoid valve 1 serves as a servo valve, with which the fuel pressure in a not shown, limited by an injection valve element control chamber is controllable. With the solenoid valve open, fuel can flow from the control chamber past a magnet armature 2 to an injector return port, not shown, arranged in the plane of the drawing above the solenoid valve 1.
- the solenoid valve 1 comprises a magnet assembly 3, which is braced within the fuel injector, not shown.
- the magnet assembly 3 comprises a sleeve-shaped carrier body 4 made of steel, which has a radially inner annular shoulder 5.
- a magnetic core 6 is arranged, which is supported in the axial direction with an annular bearing surface formed by a participatpolabexcellent 7 on the one support surface for the magnetic core forming annular shoulder 5.
- a participatpolabites 7 is an inner pole section 8.
- Constantpolabites 7 and réellepolabites 8 are connected via a not visible in the sectional view of FIG. 1, annular yoke portion together.
- the yoke section, the outer pole section 7 and the inner pole section 8 delimit an annular groove-shaped coil recess 9, which is open in the direction of the magnet armature 2.
- an electric coil 10 magnetic coil
- the electrical coil 10 comprises a winding support 11 which carries a wound winding wire 13 in an axially lower, groove-shaped section 12. Furthermore, two coil contact pins 14, 15 pointing in the axial direction are anchored in the winding support 11 and are electrically contacted with the winding wire 13 in a region axially above the winding support 11. For this purpose, the coil contact pins 14, 15 are partially wrapped by the winding wire 13, wherein the wrapped areas are each surrounded by a copper sleeve 16, 17 (welding sleeves).
- Each copper sleeve 16, 17 is arranged in a coil mandrel 18, 19, wherein the coil mandrels 18, 19 extend in the axial direction beyond the annular groove-shaped Spulenaus principleung 9 in the direction of the drawing plane up through later to be explained through holes 21, 22 therethrough , As is apparent from Fig. 1, the copper sleeves 16, 17 and the winding wires 13 are received in a Kunststoffvergussmasse 20 which closes the winding wires 13 fuel-tight and forms a main component of the coil mandrels 18, 19.
- each coil contact pin 14, 15 is associated with an aforementioned axial through opening 21, 22 in the cup-shaped magnet core 6, through which the coil contact pin 14, respectively, passes, in each case through a coil mandrel 18, 19. 15 is led out in the axial direction of the magnetic core 6.
- Each axial passage opening 21, 22, which extends from an axially lower end side to an axially upper end side of the magnetic core 6, is formed in a radially outer region as a fuel return passage 23, 24, through the fuel with open solenoid valve 1 in the plane of the drawing in the axial direction can flow upward to an injector return not shown.
- the magnet armature 2 with its upper armature plate section 25 in the plane of the drawing can not abut directly on the magnet core 6, more precisely on an inner pole surface 26 or outer pole surface 27 of the magnet core 6, but only on one axially between the armature core 6 Magnetic core 6 and the armature plate portion 25 of the armature 2 arranged stop plate 28 made of an amagnetic material. This closes when the solenoid valve is open, a central passage 29 in the magnetic core 6, which is bounded radially outward by the êtpolab songs 8 of the magnetic core 6.
- a valve closing spring 30 is accommodated, which is supported in the axial direction, for example, on a Injektordeckel (housing part), not shown, and in the axial direction down the stop plate 28 by itself on the magnet assembly 3 facing end side of the armature 2 is supported.
- the fuel return passages 23, 24 extend from a radially inner region, which lies radially within an axial, not shown projection surface of the armature plate section 25 of the armature 2, into a radially outer region which is radial lies outside the mentioned, axial projection surface of the armature plate portion 25 of the armature.
- the magnet assembly 3 is shown in FIG. 1 in a perspective view obliquely from below.
- the central passage 29 which does not serve here as a fuel return passage.
- the fuel return passages 23, 24 can be seen, which are bounded radially inward by the electric coil 10 and in the circumferential direction by the outer pole section 7.
- the fuel return ducts 23, 24 are formed in each case by a passage opening 21, 22 in the magnet core 6 open at the edge.
- the circumferential extent of the fuel return ducts 23, 24 substantially corresponds to the circumferential extent of the respective coil dome 18, 19. Only in the radial outward direction do the passage openings 21, 22 extend beyond the coil domes 18, 19.
- the cross-sectional contour of the fuel return ducts 23, 24 is formed substantially rectangular.
- a pie-shaped (niksegmentför-mige) formation can be realized.
- FIG. 3 shows an alternative embodiment of a magnetic assembly 3 for a solenoid valve 1 of a fuel injector in a view from below.
- the central passage 29 of the radially outward of is limited to the réellepolabites 8, wherein radially between the inner pole portion 8 and a situatedpolabites 7, an annular Spulenaus Principleung 9 is formed.
- FIG. 3 shows that the electrical coil 10 is designed to be thickened at two points offset from one another by 180 °.
- the coil contact pins 14, 15, not shown in FIG. 3, and the associated coil domes 18, 19 are arranged.
- the thickened regions are accommodated in axial passage openings 21, 22 which form a fuel return passage 23, 24 radially outside the electrical coil 10 in each case.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810040168 DE102008040168A1 (en) | 2008-07-04 | 2008-07-04 | Solenoid valve for a fuel injector and fuel injector |
PCT/EP2009/055375 WO2010000527A1 (en) | 2008-07-04 | 2009-05-05 | Solenoid valve for a fuel injector and fuel injector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2307699A1 true EP2307699A1 (en) | 2011-04-13 |
EP2307699B1 EP2307699B1 (en) | 2017-01-18 |
Family
ID=41051143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09772227.6A Not-in-force EP2307699B1 (en) | 2008-07-04 | 2009-05-05 | Solenoid valve for a fuel injector and fuel injector |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2307699B1 (en) |
DE (1) | DE102008040168A1 (en) |
WO (1) | WO2010000527A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013113776A1 (en) | 2012-02-03 | 2013-08-08 | Basf Se | Fungicidal pyrimidine compounds |
WO2013113781A1 (en) | 2012-02-03 | 2013-08-08 | Basf Se | Fungicidal pyrimidine compounds i |
WO2013113719A1 (en) | 2012-02-03 | 2013-08-08 | Basf Se | Fungicidal pyrimidine compounds ii |
WO2013113773A1 (en) | 2012-02-03 | 2013-08-08 | Basf Se | Fungicidal pyrimidine compounds |
WO2013113716A1 (en) | 2012-02-03 | 2013-08-08 | Basf Se | Fungicidal pyrimidine compounds |
WO2013113788A1 (en) | 2012-02-03 | 2013-08-08 | Basf Se | Fungicidal pyrimidine compounds |
AR089884A1 (en) | 2012-02-03 | 2014-09-24 | Basf Se | PIRIMIDINE FUNGICIDE COMPOUNDS |
EP2809659A1 (en) | 2012-02-03 | 2014-12-10 | Basf Se | Fungicidal pyrimidine compounds |
WO2013113782A1 (en) | 2012-02-03 | 2013-08-08 | Basf Se | Fungicidal pyrimidine compounds |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19619523A1 (en) * | 1996-05-15 | 1997-11-20 | Bosch Gmbh Robert | Fuel injector for high pressure injection |
JP3669425B2 (en) * | 2000-09-28 | 2005-07-06 | 株式会社デンソー | Coil device |
JP4062221B2 (en) * | 2003-09-17 | 2008-03-19 | 株式会社デンソー | Electromagnetic actuator, method for manufacturing electromagnetic actuator, and fuel injection valve |
DE102004013239B4 (en) | 2004-03-18 | 2015-10-01 | Robert Bosch Gmbh | Solenoid valve with adjustable armature stroke and method for setting the same |
EP1612400B1 (en) * | 2004-06-30 | 2008-03-19 | C.R.F. Società Consortile per Azioni | A method for obtaining a fuel injector for an internal-combustion engine, and an injector made according to said method |
DE102006061946B4 (en) * | 2006-12-29 | 2014-06-05 | Robert Bosch Gmbh | Fuel injector |
-
2008
- 2008-07-04 DE DE200810040168 patent/DE102008040168A1/en not_active Withdrawn
-
2009
- 2009-05-05 WO PCT/EP2009/055375 patent/WO2010000527A1/en active Application Filing
- 2009-05-05 EP EP09772227.6A patent/EP2307699B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2010000527A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010000527A1 (en) | 2010-01-07 |
EP2307699B1 (en) | 2017-01-18 |
DE102008040168A1 (en) | 2010-01-07 |
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