EP1709314A2 - Valve for controlling liquids, in particular a fuel injection valve - Google Patents
Valve for controlling liquids, in particular a fuel injection valveInfo
- Publication number
- EP1709314A2 EP1709314A2 EP04802789A EP04802789A EP1709314A2 EP 1709314 A2 EP1709314 A2 EP 1709314A2 EP 04802789 A EP04802789 A EP 04802789A EP 04802789 A EP04802789 A EP 04802789A EP 1709314 A2 EP1709314 A2 EP 1709314A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- pressure compensation
- needle
- sealing seat
- 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.)
- Withdrawn
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
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
- F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
- F02M45/08—Injectors peculiar thereto
- F02M45/086—Having more than one injection-valve controlling discharge orifices
-
- 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
-
- 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
- F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
Definitions
- Valve for controlling liquids in particular fuel injection valve
- the invention relates to a valve for controlling liquids, in particular a fuel injection valve for internal combustion engines according to the kind defined in the preamble of claim 1.
- valves When using such valves in a common rail system as a common rail injector, an injection start, an injection duration and an injection quantity are set via force relationships in the valves.
- the valves are preferably controlled either by an actuator which is arranged in the end of the valves facing away from the combustion chamber, or as a function of a force ratio applied to a valve needle, which is dependent on a pressure applied and on the Valve needle attacking spring force depending on the operating condition.
- a fuel injection valve in which an injection nozzle is designed with two valve needles, which can be controlled independently of one another.
- the second injector is opened by lowering the pressure of a hydraulic fluid in a control chamber of the fuel injector.
- the present invention is therefore based on the object of providing a valve for controlling liquids, in particular a fuel injection valve for internal combustion engines, in which an undesirably high rise the hydraulic forces acting on the valve needle in the opening direction are avoided.
- valve the valve needle is designed in a region connected to the fuel chamber with a pressure compensation surface which is acted upon with fuel supplied under high pressure into the fuel chamber when the sealing seat is open.
- valve designed according to the invention which is preferably designed as a stroke-controlled valve
- the valve needle having an actuator to control directly, which can be dimensioned smaller in comparison to a conventionally designed valve in terms of its performance, since lower forces have to be overcome by the actuator to close the valve.
- valve according to the invention is designed as a pressure-controlled valve
- the hydraulic forces acting on the valve needle in the opening direction of the sealing seat and reduced in comparison to conventional valves advantageously shorten a closing process of the valve in comparison to valves known from the prior art in such a way that a closing time is precisely adjustable and a precise injection quantity can be applied into a combustion chamber of an internal combustion engine.
- FIG. 1 shows a partial longitudinal section through a first embodiment of a valve designed according to the invention
- Figure 2 shows a second embodiment of a valve for controlling liquids, which is designed with two sealing seats
- 3 shows a development of the valve shown in Figure 2
- FIG. 4 shows a fourth exemplary embodiment of a valve designed according to the invention, the valve being designed with two valve needles, which are each designed with a pressure compensation surface and a pressure compensation piston assigned to this pressure compensation surface
- FIG. 5 is a development of the valve shown in FIG. 4, the pressure compensation piston of the valve outer needles and the valve inner needle being made in one piece.
- FIG. 1 shows a valve 1 for controlling liquids or a fuel injection valve for internal combustion engines with a valve body 2 and a valve needle 3 arranged in the valve body 2 so as to be longitudinally movable.
- the valve needle 3 interacts with a sealing seat 4 in such a way that when the valve needle 3 is in contact with the sealing seat 4, a fuel supply area 5 delimited by the valve needle 3 and the valve body 2 by a fuel chamber 6 which is also delimited by the valve body 2 and the valve needle 3 and which Injection openings 7 of the valve body 2 communicates with a combustion chamber, not shown, of an internal combustion engine, are separated.
- the valve needle 3 is designed in a region 8 connected to the fuel chamber ⁇ with a pressure compensation surface 9 which, when the sealing seat 4 is open, is pressurized with fuel supplied to the fuel chamber 6 under high pressure in such a way that on the valve needle 3 in the region of the pressure compensation surface 9 one in the closing direction of the sealing seat 4 acts force. Furthermore, a pressure compensation piston 10 is provided in the area of the pressure compensation surface 9, on the end face 11 facing the fuel chamber 6, the force acting on the pressure compensation surface 9 in the closing direction of the sealing seat 4 is supported.
- the pressure compensation piston 10 is arranged in a central bore of the valve needle 3 and is preferably operatively connected to the valve body 2 such that the pressure compensation piston 10 is not moved in the longitudinal direction of the fuel injection valve 1 when high pressure is present.
- the pressure compensation piston 10 is arranged in the valve body 2 and positioned with respect to the valve needle 3 in such a way that at least part of an end face of the valve needle 3 which can be acted upon by the fuel supplied in the fuel chamber 6 or the region 8 under high pressure, on the when the sealing seat 4 is open due to the high pressure present, a force acting on the valve needle 3 in the opening direction of the sealing seat 4 is shielded from the end face 11 of the pressure compensation piston 10 from the fuel.
- the pressure compensation surface 9 is designed as a pressure shoulder of the central bore of the valve needle 3, which is designed as a stepped bore in the valve needle 3, wherein the pressure compensation piston 10 is arranged in a part of the step bore which has a larger diameter than the part of the step bore which represents a connecting line between the pressure compensation surface 9 or the area 8 and the fuel chamber 6 outside the valve needle 3.
- the pressure compensation layer 9 is arranged so close to the sealing seat 4 of the valve body 2 that the pressure acting on the pressure compensation surface 9 corresponds at least approximately to the pressure applied to the sealing seat 4. On the one hand, this ensures that an additional so-called damage volume inside the fuel injection valve 1 is as small as possible and that the hydraulic opening forces applied to the valve needle 3 when the sealing seat 4 of the valve body 2 is open are reduced to the desired extent in comparison with conventional valves.
- the sealing seat 4 when the sealing seat 4 is closed, the fuel supplied under high pressure lies in the fuel supply area 5 up to the sealing seat 4 on the valve needle 3.
- the fuel chamber 6, ie based on the fuel supply area 5 on the opposite side of the sealing seat 4 there is a pressure value which corresponds to the pressure in the combustion chamber of the internal combustion engine and which is established via the injection openings 7 in the fuel chamber 6 with the sealing seat 4 closed. If the sealing seat 4 is opened by lifting the valve needle 3 from the sealing seat 4, the fuel under high pressure in the fuel supply area 5 flows into the fuel chamber 6 and into the area 8 of the valve needle 3, so that the pressure before and after the sealing seat 4 is the same is.
- a distance between the pressure compensation surface 9 and the sealing seat 4 and a diameter of the connecting line 12 is designed such that a pressure loss when the sealing seat 4 is open between the latter and the pressure compensation surface 9 is so small that the pressure present in the region of the sealing seat 4 is essentially corresponds to the pressure value applied to the pressure compensation surface 9. This ensures that the hydraulic forces applied to the valve needle 3 when the sealing seat 4 is open are not undesirably increased by opening the valve 1.
- FIG. 2 a second exemplary embodiment of a fuel injection valve 1 designed according to the invention is shown, which is different from that Execution according to Figure 1 with two valve needles 3A and 3B is executed.
- the valve needles 3A and 3B are arranged coaxially to one another in the valve body 2, the first valve needle 3A being an outer valve needle and the second valve needle 3B being a so-called inner valve needle.
- the fuel injection valve 1 shown in FIG. 2 differs constructively from the fuel injection valve shown in FIG. 1 in the area shown in that the valve needle 3 of the fuel injection valve 1 according to FIG. 1 differs from an outer valve needle, ie. H. in the present case the outer valve needle 3A is surrounded. Otherwise, the configuration according to the invention of the valve inner needle 3B of the fuel injection valve 1 according to FIG. 2 and its mode of operation corresponds to the function of the valve needle 3 of the valve according to FIG. 1 described above. In addition, the mode of operation of the fuel injection valve 1 according to FIG. 2 corresponds to the valves known from the prior art, which are designed with two valve needles arranged coaxially to one another.
- the fuel chamber shown in FIG. 1 is divided into two sub-regions by a sealing seat 4B of the valve inner needle 3B, ie into the first fuel chamber 6A and the second fuel chamber 6B, the first fuel chamber 6A in the region of one of the valve outer needle 3A associated sealing seat 4A of the valve body 2 is separated from the fuel supply area 5 of the fuel injection valve 1 when the outer valve needle 3A is applied to the sealing seat 4A of the valve body 2.
- the valve outer needle 3A is lifted from the sealing seat 4A of the valve body 2 and the fuel which is now fed into the first fuel chamber 6A under high pressure is injected into the combustion chamber via injection openings 7A of the valve body 2.
- valve inner needle 3B is also lifted from its associated sealing seat 4B of the valve body 2, so that fuel is also introduced into the second fuel chamber 6B, the connecting line 12 and the region 8 under high pressure, and the fuel flowing into the second fuel chamber 6B is injected into the combustion chamber of the internal combustion engine via injection openings 7B of the valve body 2.
- a direct comparison of the hydraulic forces acting on the outer valve needle 3A and on the inner valve needle 3B when the sealing seats 4A and 4B are open shows the advantage of the configuration of the inner valve needle 3B according to the invention, since the hydraulic forces acting on the outer valve needle 3A when the sealing seat 4A is open in the opening direction of the sealing seat 4A Forces in comparison to the hydraulic forces acting on valve inner needle 3B when sealing seat 4B is open in the opening direction of sealing seat 4B compared to the state of fuel injector 1 when sealing seats 4A or 4B are closed increases considerably more.
- valve inner needle 3B is designed with the pressure compensation surface 9, on which the sealing seat 4B is open in the region 8 below High-pressure fuel flowing in is present with a force acting in the closing direction of the sealing seat 4B, which in turn is directed against the force acting on the end face of the valve needle 3B facing the second fuel chamber 6B in the opening direction of the sealing seat 4B.
- the end face of the valve inner needle 3B facing the second fuel chamber 6B is to be understood as the diameter range of the valve inner needle 3B which corresponds to the diameter of the sealing seat 4B assigned to the valve inner needle 3B, since this end face only leads into the second fuel chamber 6B from under high pressure when the sealing seat 4B is open Fuel is applied.
- FIG. 3 shows a further development of the fuel injection valve 1 shown in FIG. 2, in which the pressure compensation piston 10 has a pin-shaped extension 13 which engages in the connecting line 12 and fills the central bore of the valve inner needle 3B in which the pressure compensation piston 10 is arranged. In this way, a so-called damage volume inside the fuel injection valve 1 is reduced, which ensures a precise injection process.
- FIG. 4 A fourth exemplary embodiment of a fuel injection valve designed according to the invention is shown in FIG. 4, this embodiment being a development of the fuel injection valves shown in FIGS. 2 and 3.
- the valve needles 3A and 3B in the fuel injection valve 1 shown in FIG. 4 each have a region 8A, 8B, with a pressure compensation surface 9A or 9B, with a pressure compensation piston 10A or 10B and the end faces 11A or 11B and with a connecting line 12A, 12B.
- the pressure compensation piston 10B arranged in the valve inner needle 3B is designed with a pin-shaped extension 13 which is pressed against a receiving surface or a seat surface 14 of the valve body 2, so that the pressure compensation piston 10B of the valve inner needle 3B has a damaged volume both in the area 8 and the connecting line 12 also reduced in the blind hole of the valve body 2 or in the region of the second fuel chamber 6B.
- the pressure compensation piston 10B is guided or supported by the valve body 2 through the operative connection with the valve body 2 via its end projecting into the second fuel chamber 6B in such a way that the pressure compensation piston 10B can be used as a guide element for the valve inner needle 3B. Referring to FIG.
- FIG. 5 a fifth exemplary embodiment of a fuel injection valve designed according to the invention is shown, this embodiment representing a development of the fuel injection valve shown in FIG. 4 and differing from the embodiment shown in FIG. 4 in that the pressure compensation piston 10A assigned to the valve outer needle 3A is made in one piece is designed with the valve inner needle 3B and is thus operatively connected to it.
- This configuration represents an embodiment that is more economical to manufacture in comparison to the fuel injection valve shown in FIG. 4.
- valve 5 is space-saving with a larger end face that can be exposed to fuel in the opening direction of the valve seat 4B than in the embodiment according to FIG 4 executable, so that when the sealing seat 4A is open, a greater force acting in the opening direction is applied to the valve inner needle 4B than is the case with the valve inner needle 4B according to FIG. 4.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410002083 DE102004002083A1 (en) | 2004-01-15 | 2004-01-15 | Valve for controlling fluids, in particular fuel injection valve |
PCT/DE2004/002578 WO2005068816A2 (en) | 2004-01-15 | 2004-11-22 | Valve for controlling liquids, in particular a fuel injection valve |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1709314A2 true EP1709314A2 (en) | 2006-10-11 |
Family
ID=34716561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04802789A Withdrawn EP1709314A2 (en) | 2004-01-15 | 2004-11-22 | Valve for controlling liquids, in particular a fuel injection valve |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1709314A2 (en) |
DE (1) | DE102004002083A1 (en) |
WO (1) | WO2005068816A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TR200402050A2 (en) * | 2004-08-18 | 2006-03-21 | Robert Bosch Gmbh | Dual seating diameter injector with coaxial areal contact |
DE102007002281A1 (en) | 2007-01-16 | 2008-07-17 | Robert Bosch Gmbh | Injector for fuel injection system of internal-combustion engine in motor vehicle, has guidance for servo piston designed at separation element and limiting coupler space together with separation element and piston |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1063416A3 (en) * | 1999-06-25 | 2003-08-06 | Delphi Technologies, Inc. | Fuel injector |
DE10058153A1 (en) | 2000-11-22 | 2002-06-06 | Bosch Gmbh Robert | Injection nozzle with separately controllable nozzle needles |
JP4218224B2 (en) * | 2001-04-19 | 2009-02-04 | トヨタ自動車株式会社 | Fuel injection device |
JP2002322969A (en) * | 2001-04-26 | 2002-11-08 | Toyota Motor Corp | Fuel injection device |
DE10315821A1 (en) * | 2002-11-11 | 2004-05-27 | Robert Bosch Gmbh | Motor vehicle internal combustion engine injection valve has housing with bore and pressure space defining throttled connection with valve shoulder on needle |
-
2004
- 2004-01-15 DE DE200410002083 patent/DE102004002083A1/en not_active Withdrawn
- 2004-11-22 WO PCT/DE2004/002578 patent/WO2005068816A2/en active Application Filing
- 2004-11-22 EP EP04802789A patent/EP1709314A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2005068816A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE102004002083A1 (en) | 2005-08-04 |
WO2005068816A3 (en) | 2007-03-01 |
WO2005068816A2 (en) | 2005-07-28 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR |
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AX | Request for extension of the european patent |
Extension state: AL HR LT LV MK YU |
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PUAK | Availability of information related to the publication of the international search report |
Free format text: ORIGINAL CODE: 0009015 |
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DAX | Request for extension of the european patent (deleted) | ||
17P | Request for examination filed |
Effective date: 20070903 |
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RBV | Designated contracting states (corrected) |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR |
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17Q | First examination report despatched |
Effective date: 20080410 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20081021 |