EP1706631A1 - Ventil für flüssigkeitseinspritzung - Google Patents
Ventil für flüssigkeitseinspritzungInfo
- Publication number
- EP1706631A1 EP1706631A1 EP04703786A EP04703786A EP1706631A1 EP 1706631 A1 EP1706631 A1 EP 1706631A1 EP 04703786 A EP04703786 A EP 04703786A EP 04703786 A EP04703786 A EP 04703786A EP 1706631 A1 EP1706631 A1 EP 1706631A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- injection
- needle
- injection valve
- valve needle
- 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
- 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
- F02M61/161—Means for adjusting injection-valve lift
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
Definitions
- the present invention relates to a valve for liquid injection, in particular for internal combustion engines, with an injection valve that can be opened and closed for liquid injection by means of an injection valve needle that can be moved via a control valve.
- DE 197 17 833 discloses a hydraulic servo control element for injection injectors in which a control piston can be moved via a solenoid in order to control the movement of an injection valve needle via the servo control element.
- the control by the servo control element can, however, be improved; in particular, the control for high pressures and short injection times can be better coordinated.
- the control valve has a valve housing with flow channels, a pressure chamber arranged in the axial direction adjacent to the injection valve needle for controlling the axial movement of the injection valve needle and a self-centering valve body for opening and closing an unloading channel of the pressure chamber, so that the self-centering valve body enables a particularly precise one Control of the fluid flow can take place.
- the guidance of the valve body is simplified in particular in the area of a valve seat, since the valve body is designed to be self-centering and even at high pressures for liquid injection, for example between 1,000 and 1,500 bar accurate movement of the valve body to control the injector needle is achieved.
- a valve seat on the discharge channel is frustoconical. Then the valve body can be centered by the shape of the valve seat.
- the valve body for closing the discharge channel can have a ball which can then be pressed onto the valve seat.
- the valve body preferably has a valve needle arranged in a cylindrical guide of the valve housing.
- the ball can be mounted on a pressure piece, which is arranged with radial play in the cylindrical guide for the valve needle.
- the valve body of the control valve can preferably be moved by means of a solenoid, so that electronic control of the valve is made possible with high accuracy.
- valve body is biased by a spring force into the position closing the unloading channel, the opening and closing movement can be carried out in a defined manner.
- the spring force for prestressing the valve body is preferably adjustable, so that the properties of the control valve for a targeted opening and closing of the injection valve can be determined depending on further factors, such as viscosity of the fluid, pressure, temperature etc.
- Figure 1 is a sectional view of an embodiment of a valve according to the invention.
- FIG. 2 is an enlarged detail view of a control valve of the valve shown in Figure 1;
- FIG. 3 is an enlarged detail view in the area of the pressure chamber of the control valve of Figure 2;
- FIG. 4 shows an enlarged detailed view of the control valve with the valve seat closed
- Figure 5 is an enlarged detail view of the control valve with the valve open.
- a valve 1 comprises an injection valve 2 for liquid injection, in particular for internal combustion engines such as diesel engines, in which the fuel has injection pressures of e.g. more than 1,300 bar takes place in order to keep the pollutant emissions low.
- the injection valve 2 comprises an injection valve needle 4, by means of which one or more injection openings 5 can be closed.
- the injector needle 4 is movably mounted in the axial direction.
- a high-pressure channel 6 is provided on the injection valve 2, which is connected through a connection
- the injection valve needle 4 is biased into the closed position by a spring 8.
- a control valve 3 which has a valve needle 11 which is mounted in an axially movable manner in a cylindrical guide in a housing 10.
- the movement of the valve needle 11 can be activated via a solenoid 13, a stop disk 12 being provided to limit the movement stroke.
- the solenoid 13 is located within the housing 10 and, depending on an electrical pulse, pulls the armature and the valve needle 11 connected to it in order to control a movement of the injection valve needle 4.
- a hard bush 15 Arranged within the solenoid 13 is a hard bush 15, in which a compression spring 16 is positioned, which is supported on the one hand on the stop disk 12 and on the other hand on an intermediate piece 17.
- the intermediate piece 17 can be moved via an adjusting screw 18, so that the prestressing of the compression spring 16 can be adjusted.
- the adjusting screw 18 is secured by a lock nut 19.
- the hard sleeve 15 is slightly protruding on the solenoid 13 and bears against the stop disk 12, so that a residual air gap 31 between the solenoid
- valve body of the control valve 3 includes a pressure piece 20 which has a slightly smaller diameter than the valve needle 11, so that there is a slight radial play in the housing 10 for cylindrical guidance.
- the ball 25 arranged on the pressure body 20 closes the unloading channel 24, which opens into the pressure chamber 23.
- the pressure chamber 23 is delimited on a side wall of the injection valve needle 4, and if the pressure in the pressure chamber 23 changes, the injection valve needle 4 moves accordingly.
- the fluid contained in the pressure chamber 23 can then be fed back into the fluid circuit via the discharge channel 24 in the plate 21 recessed radial flow channel 27 and a flow channel 28. Due to the pressure drop, the axial forces acting on the injection valve needle 4 in the figures are greater from bottom to top than the force of the spring 8 and thus lift the injection valve needle 4 from the injection openings 5. This allows the high-pressure fluid to flow out.
- valve needle 11 with the ball 25 If the valve needle 11 with the ball 25 is moved into the closed position by a further actuation of the solenoid 13, fluid flows through the inlet duct 22 designed as a throttle from the inlet line 6 and a pressure builds up again in the pressure chamber 23, which corresponds approximately to the pressure in the front area of the injection valve needle 4. Due to the pressure compensation, the injection valve needle 4 closes again due to the force of the spring 8.
- FIG. 4 shows the closed position of the valve needle 11, in which the ball 25 closes the discharge channel 24.
- the sealing surface is formed by an annular area which is formed between the ball 25 and a valve seat 26.
- valve 2 The open position of the valve 2 is shown in FIG. 5, the frustoconical valve seat 26 being visible. With an axial movement of the ball 25 to the
- Valve seat 26 is self-centering, so that the discharge channel 24 is securely closed even with lateral forces.
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)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Magnetically Actuated Valves (AREA)
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2004/000434 WO2005071253A1 (de) | 2004-01-21 | 2004-01-21 | Ventil für flüssigkeitseinspritzung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1706631A1 true EP1706631A1 (de) | 2006-10-04 |
EP1706631B1 EP1706631B1 (de) | 2008-07-23 |
Family
ID=34802723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04703786A Expired - Lifetime EP1706631B1 (de) | 2004-01-21 | 2004-01-21 | Ventil für flüssigkeitseinspritzung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1706631B1 (de) |
AT (1) | ATE402336T1 (de) |
DE (1) | DE502004007701D1 (de) |
WO (1) | WO2005071253A1 (de) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3584554B2 (ja) * | 1995-07-26 | 2004-11-04 | 株式会社デンソー | 蓄圧式燃料噴射装置 |
US5626325A (en) * | 1995-09-14 | 1997-05-06 | Cummins Engine Company, Inc. | High pressure control valve for a fuel injection system |
DE29723706U1 (de) | 1997-04-26 | 1999-06-10 | Dualon International S.A., Luxemburg/Luxembourg | Hydraulisches Servosteuerelement |
DE19937559A1 (de) * | 1999-08-09 | 2001-03-01 | Bosch Gmbh Robert | Zweistufiges Magnetventil in kompakter Bauweise für einen Injektor eines Einspritzsystems für Brennkraftmaschinen |
DE19958239A1 (de) * | 1999-12-03 | 2001-06-21 | Siemens Ag | Hydraulisches Ventil mit Anschlag |
DE10131125A1 (de) * | 2001-06-28 | 2002-09-12 | Bosch Gmbh Robert | Magnetventil mit gedämpftem, einteiligem Ankerelement |
-
2004
- 2004-01-21 EP EP04703786A patent/EP1706631B1/de not_active Expired - Lifetime
- 2004-01-21 WO PCT/EP2004/000434 patent/WO2005071253A1/de active IP Right Grant
- 2004-01-21 DE DE502004007701T patent/DE502004007701D1/de not_active Expired - Lifetime
- 2004-01-21 AT AT04703786T patent/ATE402336T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2005071253A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005071253A1 (de) | 2005-08-04 |
DE502004007701D1 (de) | 2008-09-04 |
EP1706631B1 (de) | 2008-07-23 |
ATE402336T1 (de) | 2008-08-15 |
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