EP4077905A1 - Kraftstoffinjektor zur einspritzung von kraftstoff - Google Patents
Kraftstoffinjektor zur einspritzung von kraftstoffInfo
- Publication number
- EP4077905A1 EP4077905A1 EP20817298.1A EP20817298A EP4077905A1 EP 4077905 A1 EP4077905 A1 EP 4077905A1 EP 20817298 A EP20817298 A EP 20817298A EP 4077905 A1 EP4077905 A1 EP 4077905A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control valve
- fuel
- armature
- fuel injector
- injector 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
- 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
- F02M63/0021—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures
-
- 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
- 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
- F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
Definitions
- the invention relates to a fuel! Injector of the kind used for injecting fuel preferably into a combustion chamber of an internal combustion engine, the fuel being injected under high pressure.
- Fuel injection valves such as those used for high-pressure injection of fuel into a combustion chamber of an internal combustion engine, are known from EP 2 126 331 B1, for example.
- a fuel injection valve has a housing in which a longitudinally displaceable nozzle needle is arranged, which opens and closes injection openings through its longitudinal movement, via which fuel can be injected into a combustion chamber under high pressure. Due to the high pressure, the fuel is finely atomized as it exits the injection openings, so that effective combustion can take place in the combustion chamber.
- the nozzle needle is moved servo-hydraulically, which means that the pressure in a control chamber, which exerts a hydraulic closing pressure on the nozzle needle, is regulated by means of a control valve. If the control valve opens, the pressure in the control chamber is reduced and the nozzle needle moves into its open position. When the control valve is closed, the high pressure in the control chamber builds up again and the nozzle needle is pushed back into its closed position.
- the control valve is designed, for example, as a solenoid valve and comprises an electromagnet, ie a coil with a magnetic core, which can be switched ge in rapid succession.
- the control valve further comprises a magnet armature, which interacts with the electromagnet.
- the electromagnet When the electromagnet is energized, the magnet armature is moved against the force of an armature spring, so that a drain opening is released through which fuel can flow out of the control chamber into a low-pressure chamber.
- a closing element with a sealing surface is formed on the armature, with which the armature interacts with a STEU valve seat.
- it is customary to guide the magnet armature in the housing so that the outlet throttle is closed tightly and reliably.
- a magnet armature which has an angular error or an axial misalignment with respect to the control valve seat, tends to be asymmetrical or to form an air gap on the stop surface against which the armature rests when the electromagnet is energized.
- leaks can occur at the control valve seat.
- the asymmetrical contact with the stop surface leads to point contact and thus to increased friction and wear.
- magnet armatures which have a shaft area, are guided in a bore or a sleeve.
- the corresponding components that lead the armature in its longitudinal movement are complex and expensive to manufacture due to the small guide play, which makes the fuel injector expensive and complex to manufacture.
- the fuel injector according to the invention has the advantage that the magnet armature can be used in a simple manner and without the use of precision components in the fuel! injector and thus a reliable function of the fuel! injector or the control valve is ensured with low manufacturing costs at the same time.
- the fuel injector has a housing in which a longitudinally displaceable nozzle needle is arranged which, with a sealing surface, opens and closes one or more injection openings through which the fuel can be injected.
- a control chamber that can be filled with fuel is formed in the housing and exerts a hydraulic force on the nozzle needle in its closing direction.
- the Pressure in the control chamber can be influenced by the control valve opening and closing a hydraulic cal connection of the control chamber to a low-pressure chamber, the control valve comprising a magnet armature which cooperates with a control valve seat to open and close the hydraulic connection.
- the armature is radially ge leads on its outside in the housing.
- the armature has an outer side which is guided radially with a relatively large play in the housing. Further guidance of the armature is not necessary, since the guidance on the outside is sufficient to hold the armature in the desired radial position. Since the armature has a high degree of mobility within the housing, angular misalignments are automatically compensated for, the radial guide play being so large that the magnet armature jamming in the housing is reliably avoided.
- a magnet armature is designed to be rotationally symmetrical, so that the function is ensured even when the magnet armature rotates within the housing.
- the radial distance between the outer edge of the armature and the housing is dimensioned so that the armature cannot be moved by more than 0.1 mm perpendicular to its direction of movement in any direction. This guide play is sufficient to hold the armature on the one hand in its functional position.
- a magnet armature is acted upon by an armature spring in the closing direction towards the control valve seat.
- the STEU can be designed as a flat seat in an advantageous embodiment.
- a flat seat is insensitive to radial displacement of the magnet armature, so that a good sealing function is guaranteed even if the magnet armature is slightly displaced in the radial direction within the guide tolerance.
- the control valve seat is conical and the magnet armature has a spherical segment-shaped closing element which is centered in the closed position in the control valve seat. Any radial deviation from the center due to the relatively large radial guide play is compensated for by the centering in the conical control valve seat or the magnet armature is pushed back into its central position so that the function of the control valve is ensured.
- the top of the magnet armature is flat.
- the upper side faces the electromagnet, so that a flat resting on the electromagnet or on a corresponding contact surface can compensate for a possible angular misalignment between the stop surface and the upper side of the magnet armature.
- the underside of the armature, which lies opposite the upper side can be flat and parallel to the upper side.
- the maximum stroke of the armature is advantageously less than or equal to 0.1 mm, which on the one hand ensures sufficient drainage from the control chamber and, on the other hand, minimizes a possible misalignment of the armature in the housing.
- Figure 1 is a longitudinal section through a fuel! injector as he comes out of the
- FIG. 2 shows another fuel injector known from the prior art, only the area of the solenoid valve being shown here,
- FIG 4 illustrations of misalignments of the magnet armature with the fuel known from the prior art! injector, Figure 5, 6 and 7 embodiments of the fuel according to the invention! injector or the control valve according to the invention.
- FIG. 1 is a fuel! injector shown in longitudinal section, as is known from the prior art.
- the fuel injector has a housing 1 which comprises a holding body 2 and a nozzle body 3 which bear against one another, wherein they are clamped against one another in a liquid-tight manner by a clamping device not shown in the drawing.
- a pressure chamber 5 is formed which can be filled with fuel under high pressure.
- the pressure chamber 5 is filled via a high-pressure channel 6 formed in the housing 1, which can be connected to a high-pressure fuel source.
- the pressure chamber 5 is delimited on the lower side in the drawing, i.e.
- the pressure chamber 5 is delimited by a valve piece 7 which is fixed by a valve tensioning screw 8 screwed into the housing 1.
- the valve piece 7 has a receptacle for a piston-shaped, longitudinally displaceable nozzle needle 10 arranged in the pressure chamber 5.
- a strange sealing surface 11 is formed, with which the nozzle needle 10 interacts with the nozzle seat 12 to open and close a flow cross-section.
- the nozzle needle 10 and the valve piece 7 delimit a control chamber 20 which can be filled with fuel under high pressure via an inlet throttle 15. Due to the hydraulic pressure in the control chamber 20, a closing force directed in the direction of the nozzle seat 12 is exerted on the nozzle needle 10. The movement of the nozzle needle 10 takes place servo-hydraulically, ie by regulating the pressure in the control chamber 20.
- an outlet throttle 16 is formed in the valve piece 7, which opens into a low-pressure chamber 21 in the holding body 2.
- the low-pressure chamber 21 is always at a low fuel pressure via a return line, not shown, but is always completely filled with fuel.
- the outlet throttle 16 is opened or closed by a control valve 22.
- the control valve 22 comprises a magnet armature 23 on which an armature plate 24, a guide section 28 and a closing element 25 are formed.
- the Mag netanker 23 extends through a bore 27 which be 8 in the Ventilspannschrau be formed.
- An armature spring 34 exerts a closing force on the magnet armature 23 in the direction of a conical control valve seat 26 formed on the valve piece 7.
- the closing element 25 is formed spherically in this embodiment, for example, and interacts with the conical control valve seat 26 to open and close the outlet throttle 16.
- the electromagnet 30, which comprises a coil 31 and a magnetic core 32, is used to move the armature 23.
- the electromagnet 30 If the electromagnet 30 is energized, it exerts a magnetic force of attraction on the magnet armature 23 and pulls it away from the control valve seat 26 against the force of the prestressed armature spring 34, so that the outlet throttle 16 opens and a connection between the control chamber 20 and the low-pressure chamber 21 will be produced. Fuel in the control chamber 20 then flows into the low-pressure chamber 21, so that the pressure in the control chamber 20 drops slightly and the valve needle 10, driven by the hydraulic pressure in the pressure chamber 5, is pushed away from the nozzle seat 12 and the connection is established between the pressure chamber 5 and the blind hole 14 or the injection openings 13 releases.
- the energization of the electromagnet 30 is terminated and the armature spring 34 presses the magnet armature 23 back into its closed position, in which the closing element 25 closes the outlet throttle 16 again.
- the fuel flowing in via the inlet throttle 15 into the control chamber 20 increases the pressure to the pressure level of the pressure chamber 5, so that the nozzle needle 10 is pushed back into its closed position.
- FIG. 2 shows another fuel injector known from the prior art, only the area of the control valve being shown here in longitudinal section. The remaining areas of the fuel injector as shown in FIG 1.
- the magnet armature 23 here has a guide section 28 which is closely guided in the bore 27 formed in the valve clamping screw 8.
- the radial play in the bore 27 is selected to be very small in order to prevent misalignment or an angular misalignment of the magnet armature 23.
- the Boh tion 27 and the guide section 28 must be made very precisely in order to ensure good guidance on the one hand and on the other hand not to provoke unnecessary wear, which would impair the service life of the control valve 22.
- the control valve seat 26 is designed as a flat seat and accordingly the closing element 25 has a flat sealing surface with which it interacts with the flat control valve seat 26.
- FIG. 5 a first embodiment of the control valve according to the invention is shown.
- the magnet armature 23 is essentially plate-shaped and has a flat top side 123 facing the electromagnet 30. Opposite the flat upper side 123, a likewise flat underside 223 is formed on the magnet armature 23, which cooperates with the control valve seat 26 embodied as a flat seat.
- the magnet armature 23 is guided on its outer side in a sleeve 17 which defines the distance between the electromagnet 30 or the magnet core 32 and the valve clamping screw 8.
- the guide play d is relatively large compared to the guide in a bore, as in the embodiment shown in Figure 1, for example 0.1 mm or slightly less.
- sufficient guidance of the magnet tanker 23 in the sleeve 17 is ensured and, on the other hand, the fuel can flow freely between the top 123 and the bottom 223 in order not to hinder the movement of the magnet armature 23.
- provision can also be made for bores to be made in the magnet armature 23 which connect the upper side with the lower side.
- FIG. 5 also shows an angular misalignment of the magnet armature 23 with respect to the longitudinal axis or the underside of the electromagnet 30, the angle being drawn significantly larger than it actually occurs for the sake of clarity.
- the electromagnet 30 is switched on in this embodiment, the magnetic force pulls the armature 23 into contact with the Mag netkern 32 and lies flat against it.
- a possible angular misalignment by the angle ⁇ is compensated for, since the magnet armature 23 always rests flat on the magnet core 32.
- the armature spring 34 pushes the armature 23 back to the flat Steuerven tilsitz 26, wherein the angular misalignment can be compensated again.
- the stroke h of the armature 23 is relatively small, for example 0.1 mm.
- FIG. 6 shows a further embodiment of the control valve according to the invention.
- the magnet armature 23 does not have a flat surface parallel to the upper side here, but a spherical closing element 25 which cooperates with a conical control valve seat 26, as already shown in FIG. Since the armature 23 in the sleeve 17 is a relative has large radial play, the armature 23 is centered by the closing element 25 so that it always returns to its central position without the need for further guide elements.
- FIG. 7 shows a further exemplary embodiment with a flat seat, that is to say that the closing element 25 ′ interacts with a flat control valve seat 26.
- the closing element 25 ' is designed here as a cylindrical component, as a result of which the demands on the magnet armature with regard to wear are reduced.
- the material of the magnet armature 23 can be optimized with regard to the magnetic properties with reduced requirements for mechanical stability and thus with greater freedom of design.
- Further improvements can be achieved in that the sleeve 17, the closing element 25 'and the upper stroke stop are made of no or only slightly magnetizable rem material.
- the upper stroke stop is implemented here in the form of a disk 36 which is clamped between the sleeve 17 and the magnetic core 32 and against which the armature plate 24 rests in the open position of the control valve.
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)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019220061.3A DE102019220061A1 (de) | 2019-12-18 | 2019-12-18 | Kraftstoffinjektor zur Einspritzung von Kraftstoff |
| PCT/EP2020/084118 WO2021121971A1 (de) | 2019-12-18 | 2020-12-01 | Kraftstoffinjektor zur einspritzung von kraftstoff |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4077905A1 true EP4077905A1 (de) | 2022-10-26 |
| EP4077905B1 EP4077905B1 (de) | 2025-03-19 |
Family
ID=73695022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20817298.1A Active EP4077905B1 (de) | 2019-12-18 | 2020-12-01 | Kraftstoffinjektor zur einspritzung von kraftstoff |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12241441B2 (de) |
| EP (1) | EP4077905B1 (de) |
| CN (1) | CN115151723B (de) |
| DE (1) | DE102019220061A1 (de) |
| WO (1) | WO2021121971A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6298829B1 (en) * | 1999-10-15 | 2001-10-09 | Westport Research Inc. | Directly actuated injection valve |
| DE10131201A1 (de) * | 2001-06-28 | 2003-01-16 | Bosch Gmbh Robert | Magnetventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine |
| ITTO20010814A1 (it) * | 2001-08-14 | 2003-02-14 | Fiat Ricerche | Iniettore di combustibile per un motore endotermico e relativo metododi fabbricazione. |
| DE10161002A1 (de) * | 2001-12-12 | 2003-07-03 | Bosch Gmbh Robert | Magnetventil zur Steuerung eines Einspritzventils einer Brennkraftmaschine |
| DE102007008262A1 (de) | 2007-02-20 | 2008-08-21 | Robert Bosch Gmbh | Kraftstoffeinspritzventil zur Kraftstoffeinspritzung in Brennkraftmaschinen |
| JP2010174820A (ja) | 2009-01-30 | 2010-08-12 | Denso Corp | 燃料噴射弁 |
| DE102014220345A1 (de) * | 2014-10-08 | 2016-04-14 | Robert Bosch Gmbh | Kraftstoffeinspritzventil |
| DE102016220912A1 (de) | 2016-10-25 | 2018-04-26 | Robert Bosch Gmbh | Kraftstoffeinspritzventil |
-
2019
- 2019-12-18 DE DE102019220061.3A patent/DE102019220061A1/de active Pending
-
2020
- 2020-12-01 EP EP20817298.1A patent/EP4077905B1/de active Active
- 2020-12-01 CN CN202080097045.9A patent/CN115151723B/zh active Active
- 2020-12-01 WO PCT/EP2020/084118 patent/WO2021121971A1/de not_active Ceased
- 2020-12-01 US US17/786,019 patent/US12241441B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021121971A1 (de) | 2021-06-24 |
| US12241441B2 (en) | 2025-03-04 |
| CN115151723A (zh) | 2022-10-04 |
| EP4077905B1 (de) | 2025-03-19 |
| DE102019220061A1 (de) | 2021-06-24 |
| CN115151723B (zh) | 2025-07-18 |
| US20230022358A1 (en) | 2023-01-26 |
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