EP3833865A1 - Ventil eines kraftstoffinjektors - Google Patents
Ventil eines kraftstoffinjektorsInfo
- Publication number
- EP3833865A1 EP3833865A1 EP19768811.2A EP19768811A EP3833865A1 EP 3833865 A1 EP3833865 A1 EP 3833865A1 EP 19768811 A EP19768811 A EP 19768811A EP 3833865 A1 EP3833865 A1 EP 3833865A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- armature
- damping element
- valve
- opening
- fuel
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 33
- 238000013016 damping Methods 0.000 claims abstract description 77
- 230000007704 transition Effects 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 3
- 239000002283 diesel fuel Substances 0.000 claims description 2
- 230000005291 magnetic effect Effects 0.000 description 19
- 238000002485 combustion reaction Methods 0.000 description 10
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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
- 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
- F02M63/0075—Stop members in valves, e.g. plates or disks limiting the movement of armature, valve or spring
-
- 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
- F02M63/0019—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of electromagnets or fixed armatures
Definitions
- the present invention relates to a valve of a fuel injector.
- Fuel injectors which are also called injection nozzles, are an essential part of every internal combustion engine, since the required amount of the burning fuel is introduced into the combustion chamber. For clean combustion, it is of great importance to maintain the opening and closing of the injector as quickly as possible over the entire lifespan of an injector, in order to be able to continuously supply an exact amount of fuel.
- a valve is present for a transition from a closed to an open state of the injector, which separates a high-pressure region of the fuel from a region with low pressure. If the areas are connected to one another by the valve moving into its open position, this leads to an injection process of fuel by the injector via a hydraulic-mechanical functional chain.
- a solenoid valve In a closed state, a guided in a guide magnetizable part, the armature, is subjected to a prestressing force by means of a resilient element, which presses the armature in the axial direction away from the magnet towards a seat plate which has an opening. By pressing the armature towards the seat plate, the armature closes the opening, so that a connection between the high-pressure region and the low-pressure region of the fuel, which connection extends through the opening, is closed.
- a sealing plate of the armature facing the seat plate closes the opening in the seat plate, so that the area under high pressure is separated from an area with low pressure.
- the area under high pressure corresponds to the system pressure with which the fuel is injected into the combustion chamber.
- the area with the lower pressure corresponds to the tank pressure or the ambient pressure.
- connection between the high pressure area and the low pressure area is released via the opening in the seat plate by an axial movement of the armature in the direction of the magnet, so that fuel can flow from the high pressure area into the low pressure area.
- At least one fuel inlet from the injector is released into the combustion chamber via the hydraulic-mechanical active chain already briefly mentioned, so that fuel enters the combustion chamber.
- the aim of the present invention is to minimize the armature bouncing when the armature strikes the magnet, so that the disadvantages associated therewith can be alleviated or overcome.
- This is achieved using a valve of a fuel injector that has all of the features of claim 1. Advantageous configurations of this valve can be found in the dependent claims.
- the valve of a fuel injector for selectively separating a high-pressure area from a low-pressure area of a fuel comprises an opening in a seat plate, an armature, which is designed to close the opening of the seat plate, a spring element that the armature in the direction of the opening biasing position and an electromagnet for lifting the armature from the position closing the opening into a position releasing the opening.
- the valve according to the invention is characterized in that it further comprises an elastically compressible damping element for limiting an armature stroke when the armature is lifted from the seat plate into the releasing position.
- This elastically compressible damping element therefore dampens the movement of the armature when the magnet is activated and the armature is pulled away from the opening as a result, so that the bouncing between the magnet and armature is prevented or weakened.
- the damping element is a soft, elastic damping element.
- a soft-elastic design of the damping element is particularly well suited to suppressing the oscillating oscillation in relation to the oscillating oscillating movement of the armature, which results when the damping element hits the damping element with a continuous magnetic attraction force away from the opening.
- the stiffness of the damping element is less than the stiffness of the armature.
- the damping element is a damping pin with a substantially cylindrical shape, which preferably has a cross-sectional reduction between its two end faces. One of the two end faces is designed to serve as a stop face for the anchor. With the other of the two end faces, it can be provided that the pin is arranged in a recess in the magnet.
- the reduction in cross section can represent a groove running around the outer circumference of the pin, which preferably runs completely around the outer circumference.
- the circumferential groove, viewed in cross section has an arc shape which is rounded in the groove transitions.
- the damping element has a spherical section on its contact surface with the armature in order to minimize a contact surface with the armature.
- this creates a small contact area with the armature, which is desirable in relation to the lowest possible remanent force of the magnet. It is advantageous that the magnetic flux across the contact area is as small as possible.
- the spherical contact surface advantageously ensures that when the damping element is tilted due to tolerances, the contact surface between the damping element and armature is always the same.
- the poles of the electromagnet and the end face of the damping element touching the armature lie in a common plane in a relaxed state of the damping element.
- the end sections of the poles facing the armature and the end face of the damping element touching the armature are arranged in a common plane when the armature is in its relaxed state and it is not attracted by the magnet.
- the damping element is designed separately from a housing of a fuel injector. It can be provided that the damping element is mounted and held in position by a press fit. The press fit can be implemented, for example, by providing a recess in the magnet in which the damping element is received.
- the pretensioning force of the spring element is adjustable, preferably via adjusting disks for changing the position of the spring element relative to the damping element and / or the armature.
- the spring preload force can be set exactly, even if there is an undesired deviation of the spring force from the expected spring force value.
- the end face of the damping element facing away from the armature is designed as a flat seat. It can be provided that the flat seat is arranged in the magnet.
- the armature has an elevation in its surface facing the damping element, with which the armature strikes the damping element.
- a distance can be provided between the pole cores of the magnet and an end face of the armature that is not provided with an elevation. This prevents contact between the armature and the magnet.
- the anchor can be made in several parts, so that it comprises an anchor part and a seat part or consists of these parts.
- the spring element is a spiral spring, which preferably extends spirally around the damping element or spirally winds around the damping element.
- the damping element is thus partially or completely accommodated in the space delimited by the spiral shape of the spring element.
- the armature only comes into contact with the damping element during the transition from the position closing the opening into the position opening the opening.
- the anchor touches the seat plate and also the spring element, which exerts a spring force exerted in the direction of the opening, in a still tight state with a sealing surface.
- the structure of the valve is rotationally symmetrical or rotationally symmetrical to an axis of rotation, which is preferably identical to an axis of rotation of the damping element.
- the invention also relates to a fuel! njector with a valve according to a variant listed above, in particular a diesel fuel injector.
- Fig. 2 a force diagram at the transition of the armature between its two
- Fig. 3 a representation of the anchor stroke depending on different
- FIG. 1 shows a partial longitudinal section view of the valve 1 according to the invention.
- the seat plate 3 which separates the high-pressure area (on the underside) from a low-pressure area (on the top), has an opening 2, which connects a high-pressure area and a low-pressure area of fuel to one another can connect.
- This opening 2 is closed by an anchor 4, which seals the opening 2 in its closed state with its sealing surface 15.
- the armature 4 can be lifted out of this position when the magnet 6 is activated and thus pulls the armature 4 out of the opening 2.
- a spiral spring 5 ensures that the armature 4 is pressed with its sealing surface 15 against the opening 2.
- the magnet 6 has a coil 61 and a coil casing 62, so that a magnetic force can be generated by current flowing through the coil 61.
- a damping element 7 is arranged, which corresponds to a damping pin in the illustration shown.
- This damping pin 7 has a first end face 8 which faces the armature 4.
- the end face 8 is rounded in the present case or corresponds to a section of a ball, so that when the armature 4 strikes the damping element 7, only the smallest possible contact area between the armature 4 and the damping element 7 is produced.
- the damping element 7 has a recess 14 in its circumference, which ensures a lower rigidity and thus a certain elasticity of the damping element 7.
- This recess 14 can be provided rounded, as can be seen from reference numeral 12.
- the damping element 7 can be held in the magnet 6 by an interference fit.
- an adjusting disk 11 can be provided for adjusting the prestressing force of the spring element 5, with which the spring can be moved in its position in the axial direction.
- the armature 4 can have an elevation 13 with which the armature 4 meets the contact surface 8 of the damping element 7.
- An armature guide 16 is provided so that the armature is guided during a transition from its sealing position to the position that opens the opening 2.
- a spacer ring 17 shields the armature 4 from the housing 10 of a fuel! njectors.
- the magnetic poles of the magnet 6 are designated by the reference number 9.
- the axis of symmetry 13 shows that the valve 1 is mirror-symmetrical and / or rotationally symmetrical.
- a magnetizable part guided in the armature guide 16, here the armature 4 is acted upon by the spring element 5 with a force that can be defined via the adjusting disc 11, the pretensioning force, which moves the armature 4 away from the magnet 6 in the axial direction closes a sealing part of the seat plate 3.
- the seat plate 3 separates a high pressure area from a low pressure area of the fuel.
- the connection between the high-pressure area and the low-pressure area is released via the opening 2 in the seat plate 3 by an axial movement of the armature 4 in the direction of the magnet 6, so that fuel flows from the high-pressure area located at the bottom in FIG Low pressure area, which is arranged in FIG. 1 above the seat plate 3, can flow.
- At least one fuel inlet from the injector is released into the combustion chamber and fuel is supplied to the combustion chamber via a hydraulic-mechanical active chain.
- the armature 4 is always accelerated by the increasing magnetic force increasing with increasing distance until the armature 4 comes to a stop on the damping element 7.
- the armature 4 meets a contact surface 8 of the damping element 7, which is formed above by a pin.
- the damping pin 7 acts like a very hard spring, but has a comparatively low rigidity compared to the armature 4. It can be provided that the stiffness of the damping pin or the damping element is less than 70%, preferably less than 50% and preferably less than 30% of the stiffness of the armature 4. The damping pin 7 brakes the armature 4 completely, the damping pin 7 being elastically compressed. It comes down to the contact between armature 4 and pin 7 to no further mechanical contact between armature 4 and magnet 6.
- the restoring force of the spring 5 and of the pin 7 causes the pin 7 to expand in the direction of the opening 2 of the seat plate 3.
- the pin 7 is deformed to a degree at which cancel out the sum of the forces acting on the armature 4 (the attractive magnetic force and the repulsive restoring force due to the spring 5 and pin deformation) in the balance of forces.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018122250.5A DE102018122250A1 (de) | 2018-09-12 | 2018-09-12 | Ventil eines Kraftstoffinjektors |
PCT/EP2019/074420 WO2020053359A1 (de) | 2018-09-12 | 2019-09-12 | Ventil eines kraftstoffinjektors |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3833865A1 true EP3833865A1 (de) | 2021-06-16 |
Family
ID=67953806
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19768811.2A Pending EP3833865A1 (de) | 2018-09-12 | 2019-09-12 | Ventil eines kraftstoffinjektors |
Country Status (5)
Country | Link |
---|---|
US (1) | US20210254590A1 (de) |
EP (1) | EP3833865A1 (de) |
CN (1) | CN112771269A (de) |
DE (1) | DE102018122250A1 (de) |
WO (1) | WO2020053359A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021133281A1 (de) * | 2021-12-15 | 2023-06-15 | Liebherr-Components Deggendorf Gmbh | Elektromagnetventil, insbesondere zum Schalten eines Kraftstoffinjektors |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4978074A (en) * | 1989-06-21 | 1990-12-18 | General Motors Corporation | Solenoid actuated valve assembly |
IT220662Z2 (it) * | 1990-10-31 | 1993-10-08 | Elasis Sistema Ricerca Fita Nel Mezzogiorno Soc.Consortile P.A. | Perfezionamenti alla valvola pilota e alla relativa ancora di comando odi un iniettore elettromagnetico per sistemi di iniezione del combustibile di motori a combustione interna |
US5238224A (en) * | 1992-08-20 | 1993-08-24 | Siemens Automotive L.P. | Dry coil |
US6254200B1 (en) * | 1998-10-30 | 2001-07-03 | Kelsey-Hayes Company | Supply valve for a hydraulic control unit of a vehicular braking system |
US7051961B2 (en) * | 2002-06-07 | 2006-05-30 | Synerject, Llc | Fuel injector with a coating |
DE102007012706A1 (de) * | 2007-03-16 | 2008-09-18 | Robert Bosch Gmbh | Ventil für Kraftstoffinjektoren |
JP2013217330A (ja) * | 2012-04-11 | 2013-10-24 | Denso Corp | 燃料噴射装置 |
DE102012215448B3 (de) * | 2012-08-31 | 2013-12-12 | Continental Automotive Gmbh | Injektor zur Krafteinspritzung in eine Brennkraftmaschine |
US9016603B2 (en) * | 2013-01-23 | 2015-04-28 | Caterpillar Inc. | Fuel injector |
JP5772881B2 (ja) * | 2013-06-18 | 2015-09-02 | 株式会社デンソー | 電磁弁 |
DE102014220877B3 (de) * | 2014-10-15 | 2015-12-03 | Continental Automotive Gmbh | Kraftstoffeinspritzventil |
DE102015209783A1 (de) * | 2015-05-28 | 2016-12-01 | Robert Bosch Gmbh | Verfahren zur Ansteuerung eines Kraftstoffinjektors |
DE102017218267B4 (de) * | 2017-10-12 | 2019-05-02 | Continental Automotive Gmbh | Fluidventil und Verfahren zur Steuerung der Zufuhr von Fluid |
JP7197108B2 (ja) * | 2018-05-29 | 2022-12-27 | 株式会社ニッキ | インジェクタ |
-
2018
- 2018-09-12 DE DE102018122250.5A patent/DE102018122250A1/de active Pending
-
2019
- 2019-09-12 US US17/271,698 patent/US20210254590A1/en active Pending
- 2019-09-12 EP EP19768811.2A patent/EP3833865A1/de active Pending
- 2019-09-12 WO PCT/EP2019/074420 patent/WO2020053359A1/de unknown
- 2019-09-12 CN CN201980062173.7A patent/CN112771269A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
CN112771269A (zh) | 2021-05-07 |
US20210254590A1 (en) | 2021-08-19 |
DE102018122250A1 (de) | 2020-03-12 |
WO2020053359A1 (de) | 2020-03-19 |
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Legal Events
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