EP1399664A1 - Ventil zum steuern von flüssigkeiten - Google Patents
Ventil zum steuern von flüssigkeitenInfo
- Publication number
- EP1399664A1 EP1399664A1 EP02740339A EP02740339A EP1399664A1 EP 1399664 A1 EP1399664 A1 EP 1399664A1 EP 02740339 A EP02740339 A EP 02740339A EP 02740339 A EP02740339 A EP 02740339A EP 1399664 A1 EP1399664 A1 EP 1399664A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- piezo actuator
- valve
- valve according
- piezo
- 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- Withdrawn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
- 239000007788 liquid Substances 0.000 title claims abstract description 11
- 239000012528 membrane Substances 0.000 claims description 67
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 239000000446 fuel Substances 0.000 description 9
- 238000007789 sealing Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910001374 Invar Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007704 transition Effects 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
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
-
- 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
Definitions
- the present invention relates to a valve for controlling liquids and, in particular, to a fuel injection valve.
- Valves for controlling liquids are known in different configurations.
- US Pat. No. 4,022,166 discloses a piezoelectric fuel injection valve in which the valve member is controlled via a piezoelectric element. The stroke of the piezoelectric element is transmitted directly to the valve needle via a lever. Furthermore, two return springs are provided to hold the valve needle and the lever in their initial position. Because of this configuration with two return springs, which are connected to one another via the lever, a very vibration-sensitive structure is created, which is not particularly suitable for high-pressure injection, since the vibrations can build up.
- injectors are known which use hydraulic translators to translate the stroke of a piezo actuator.
- such solutions generally have a relatively complicated structure and consist of a large number of parts. Furthermore, a constant filling of the hydraulic translator is necessary to compensate for leakage losses, which makes such valves relatively complicated and increases the cost of production.
- the valve according to the invention for controlling liquids with the features of claim 1 has the advantage over the fact that it has only a small number of parts and is therefore very simple in construction and can be produced inexpensively.
- a diaphragm translator is used to translate the stroke of a piezo actuator.
- the membrane can be provided very inexpensively.
- the membrane is prestressed according to the invention and provides a sealing function. As a result, a seal against leakage oil is achieved in the translation according to the invention.
- Temperature compensation is provided to compensate for a change in length of the piezo actuator in the event of temperature increases during operation.
- the combination of temperature compensation according to the invention with a prestressed membrane translator enables a stroke of a piezo actuator to be translated with high accuracy and without a time delay, the valve having only a small number of components and being very compact. As a result, only a small space is required for the valve according to the invention.
- the membrane is preferably prestressed by means of a spring element.
- a disc spring or a spiral spring is particularly preferably used.
- the membrane is particularly preferably biased against the piezo actuator. This also enables the piezo actuator to be pretensioned. This means that a separate biasing element for the piezo actuator can be saved.
- the membrane is designed such that it has an annular force introduction region which projects to the side of the piezo actuator.
- a force delivery area is preferably formed in the interior of the force introduction area.
- the spring element for biasing the membrane particularly preferably engages on the underside of the force introduction area.
- the biasing force of the spring element can act directly on the piezo actuator.
- To protect the membrane from damage are preferably between the Contact areas of the membrane and the biasing element or components of the piezo actuator intermediate elements are provided.
- the membrane according to the invention is preferably arranged in such a way that it seals the piezo actuator against the control valve.
- the translator membrane is also designed as a sealing element.
- an additional seal is necessary in order to seal the piezo actuator from the liquid to be controlled.
- a separate seal is usually used directly on the piezo actuator.
- the device for temperature compensation is advantageously arranged directly on the piezo actuator.
- a particularly compact construction of the valve according to the invention can thereby be achieved.
- the temperature compensation device comprises a first foot part, a second foot part and a sleeve.
- the first and the second foot part are each arranged on the end faces of the piezo actuator.
- the sleeve surrounds the foot parts and the piezo actuator.
- the temperature-related change in length of the first and second foot parts and the piezo actuator essentially corresponds to the temperature-related change in length of the sleeve.
- the piezo actuator is particularly preferably surrounded by a heat conducting medium.
- the sleeve is preferably made of a material with a coefficient of expansion similar to that of the piezo actuator, such as Invar.
- the foot parts can be made of aluminum, for example, to optimize temperature compensation.
- the piezo actuator generally has a negative coefficient of expansion and the aluminum base parts have a positive coefficient of expansion, so that the total expansion corresponds approximately to the expansion of the sleeve.
- the membrane is in direct contact with the second foot part of the temperature compensation device.
- the membrane is preferably bent at its lateral fastening at a predetermined angle against the direction of force of the piezo actuator.
- a predetermined distance can be present between the membrane and the second foot part when the valve is not actuated.
- Temperature compensation can be compensated. It should be noted that it is also possible to provide the distance between the membrane and a valve member of the control valve. However, it is preferred to provide the distance from the temperature compensation between the membrane and the second foot part, since this does not translate the temperature compensation error by the membrane translator.
- the control valve is preferably designed as an outward opening valve.
- the valve according to the invention is particularly preferably used as a fuel injection valve in a storage injection system, such as, for example, a common rail system.
- Figure 1 is a schematic sectional view of a valve for injecting fuel according to an embodiment of the present invention.
- Figure 2 is a schematic enlarged
- Figure 1 shows a sectional view of a
- Fuel injection valve 1 for a common rail system according to the present invention.
- the valve 1 comprises a piezo actuator 2, a device 27 for temperature compensation and a biasing element 9. Die
- Temperature compensation device 27 comprises a first foot part 4, a second foot part 5, a sleeve 6 and a heat conducting medium 7.
- the first and second foot parts 4 and 5 are each on the end faces of the piezo actuator 2 arranged.
- the heat-conducting medium 7 surrounds the side areas of the piezo actuator 2.
- the sleeve 6 serves as a housing and surrounds the two base parts 4 and 5 and the heat-conducting medium 7.
- the base parts 4 and 5 are made of aluminum and the sleeve 6 is made of Invar, which is similar Expansion coefficient as the piezo actuator has.
- the piezo actuator 2 has a negative expansion coefficient and the aluminum base parts have a large positive expansion coefficient, so that their sum is approximately equal to the expansion of the sleeve 6.
- 4 through holes are provided in the first foot part in order to lead lines for electrical connections 26 through them.
- the membrane 3 according to the invention is shown enlarged in FIG.
- the membrane 3 comprises a holding area 30, a force introduction area 31 and a force output area 32.
- the membrane 3 is firmly clamped between a housing shoulder 12 and an injector holding body 10. The clamping takes place by means of a screw connection 11 which passes through the membrane 3.
- the force introduction area 31 of the membrane is formed in a bead shape and is bent in the opposite direction to the force F p of the piezo actuator (cf. FIG. 2).
- the force introduction area 31 projects from the membrane 3 to the side of the piezo actuator 2.
- the force introduction area 31 is in direct contact with the second foot part 5.
- intermediate elements 17 and 19 are arranged at the contact points between the membrane and the second foot part 5 or between the membrane and the spring element 9.
- the power output area 32 is flat and circular and lies in the middle of the annular force introduction area 31.
- the stroke of the piezo actuator 2 which is translated by the membrane 3 is delivered to a control valve 14. More precisely, the stroke is delivered to a valve member 15, which is connected to the membrane via a pressure element 13 to protect the membrane 3 (cf. FIG. 1).
- the control valve 14 includes the valve member 15 and releases or closes a valve seat 16.
- the valve member 15 consists of a cylindrical area with an annular groove and a closure area with inclined contact surfaces. In the starting position, valve member 15 is located on valve seat 16 and closes it. Via the annular groove in the valve member 15, the control valve 14 is further connected to a leak oil line 18, which leads to a leak oil connection (see FIG. 1).
- the control valve 14 is also connected via a throttle 20 to a control chamber 21, in which a piston 22 is arranged.
- a valve needle not shown, is actuated in a known manner via the piston 22.
- the control chamber 21 is connected via a throttle 24 to an inlet 23 from the Com on-Rail.
- a line 25 branching off from the inlet 23 leads to the nozzle.
- the spring element 9 is designed as an annular disc spring which is arranged in a recess 8 formed in the injector holding body 10.
- the spring element 9 biases the membrane in the direction of the piezo actuator 2.
- the piezo actuator 2 itself is also biased by the spring element 9.
- valve 1 The operation of the valve 1 according to the invention is described below.
- the piezo actuator 2 When the piezo actuator 2 is activated, its stroke is transmitted to the membrane 3 via the second foot part 5. More precisely, the stroke of the piezo actuator 2 on the
- the membrane 3 is firmly clamped between the threaded ring 11 and the housing shoulder 12.
- an O-ring can be provided on the outer circumference of the membrane 3 to seal the clamped area.
- the force introduction area 31 of the membrane 3 is arranged at an angle ⁇ to the holding area 30. It is also at a transition area between the holding area 30 and the
- Force introduction area 31 is provided a curved area with a predetermined radius. The tensile stresses in the membrane can be minimized by this design at the clamping point of the membrane 3. This ensures a long service life of the membrane 3.
- the force F p exerted by the piezo actuator 2 on the membrane 3 is translated by the membrane ratio a / b and is transmitted to the control valve 14 at the force output area 32 via the pressure element 13.
- the distance a corresponds to the distance between the center of the applied force F p of the piezo actuator 2 and the inner edge area of the clamped membrane 3.
- the distance b corresponds to the distance from the center of the introduced F P to the central axis XX of the valve 1 (cf. Figure 2).
- the prestressing of the diaphragm 3 by means of the spring element 9 causes high tensile stresses on the underside, ie the side facing the control valve 14, and high compressive stresses on the top, ie the side facing the piezo actuator 2, at the clamping point 30 of the diaphragm 3. which however by the above-mentioned curved design are limited with a given radius. These stresses are reduced during the movement of the membrane.
- the translated stroke of the piezo actuator 2 is transmitted to the valve member 15 of the control valve 14, which thereby lifts it from its valve seat 16. This creates a connection between the control chamber 21 and the leakage oil line 18, so that the pressure in the control chamber 21 drops.
- the piston 22 is moved upward in the direction of the piezo actuator 2 and a valve needle (not shown) connected to the piston 22 lifts off its seat. This starts the fuel injection at the valve needle.
- the piezo actuator 2 is actuated again, as a result of which it returns to its starting position.
- the return to its starting position is supported by the spring element 9.
- the spring element 9 further ensures that the membrane 3 also returns to its initial position, so that the valve member 15 rests on the valve seat 16 and closes the passage.
- pressure can build up again in the control chamber 21, as a result of which the piston 22 is moved downward again into its starting position.
- the valve needle connected to the piston 22 closes the injection opening again, so that the injection of fuel is completed.
- the temperature compensation device 27 ensures that a change in length of the piezo actuator 2 due to an increase in temperature can be compensated mechanically.
- a predetermined distance can be provided between the membrane 3 and the second foot part 5, which is a much smaller distance than the stroke of the piezo actuator. This distance can be determined by the
- Temperature compensation device 27 compensate for uneven length change of the piezo actuator 2.
- the stroke of the piezo actuator 2 is thus translated with a transmission ratio a / b.
- the transmission ratio can be changed in a relatively simple manner.
- the membrane 3 according to the invention also performs a sealing function of the piezo actuator from the fuel area of the valve. This ensures that no fuel can reach the piezo actuator 2 and thus could impair its functionality. It is therefore possible to dispense with the sealing element that is otherwise required when using piezo actuators, which is usually arranged directly on the piezo actuator 2. As a result, the manufacturing costs for the valve according to the invention can be reduced further.
- the angle ⁇ is the angle between the horizontal Holding area 30 of the membrane and the slope at the force introduction area 31, as shown in FIG. 2.
- the present invention thus relates to a valve for controlling liquids with a piezo actuator 2, a translator for translating the stroke of the piezo actuator 2 and a control valve 14 which can be actuated by the translator intended.
- the translator is designed as a membrane 3 and arranged in a prestressed state.
- the membrane 3 translates the stroke of the piezo actuator with a gear ratio a / b.
- the piezo actuator 2 is sealed from the liquid to be controlled by the membrane 3.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10123172 | 2001-05-12 | ||
DE10123172A DE10123172A1 (de) | 2001-05-12 | 2001-05-12 | Ventil zum Steuern von Flüssigkeiten |
PCT/DE2002/001702 WO2002092993A1 (de) | 2001-05-12 | 2002-05-10 | Ventil zum steuern von flüssigkeiten |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1399664A1 true EP1399664A1 (de) | 2004-03-24 |
Family
ID=7684569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02740339A Withdrawn EP1399664A1 (de) | 2001-05-12 | 2002-05-10 | Ventil zum steuern von flüssigkeiten |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040084998A1 (ja) |
EP (1) | EP1399664A1 (ja) |
JP (1) | JP2004519611A (ja) |
DE (1) | DE10123172A1 (ja) |
WO (1) | WO2002092993A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BRPI0416808A (pt) | 2003-11-20 | 2007-01-09 | Viking Technologies Lc | termo-compensação integral para atuador eletro-mecánico |
DE102004026172A1 (de) * | 2004-05-28 | 2005-12-22 | Siemens Ag | Einspritzventil und Verfahren zum Herstellen eines Einspritzventils |
DE102008001142A1 (de) * | 2008-04-14 | 2009-10-15 | Zf Friedrichshafen Ag | Steuerventil mit einem piezoelektrischen Aktuator |
DE102010051743B4 (de) | 2010-11-19 | 2022-09-01 | C. Miethke Gmbh & Co. Kg | Programmierbares Hydrocephalusventil |
DE102011008467B4 (de) * | 2011-01-13 | 2014-01-02 | Continental Automotive Gmbh | Injektor mit Druckausgleichsmitteln |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4022166A (en) | 1975-04-03 | 1977-05-10 | Teledyne Industries, Inc. | Piezoelectric fuel injector valve |
US4803393A (en) * | 1986-07-31 | 1989-02-07 | Toyota Jidosha Kabushiki Kaisha | Piezoelectric actuator |
DE59712556D1 (de) * | 1996-09-30 | 2006-04-13 | Siemens Ag | Vorrichtung zur Übertragung des Auslenkung eines Aktors |
DE19802495A1 (de) * | 1997-06-19 | 1998-12-24 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
DE19826339A1 (de) * | 1998-06-12 | 1999-12-16 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
DE19939476C2 (de) * | 1999-08-20 | 2003-02-20 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
-
2001
- 2001-05-12 DE DE10123172A patent/DE10123172A1/de not_active Ceased
-
2002
- 2002-05-10 JP JP2002590234A patent/JP2004519611A/ja active Pending
- 2002-05-10 US US10/332,746 patent/US20040084998A1/en not_active Abandoned
- 2002-05-10 WO PCT/DE2002/001702 patent/WO2002092993A1/de not_active Application Discontinuation
- 2002-05-10 EP EP02740339A patent/EP1399664A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO02092993A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20040084998A1 (en) | 2004-05-06 |
JP2004519611A (ja) | 2004-07-02 |
WO2002092993A1 (de) | 2002-11-21 |
DE10123172A1 (de) | 2002-11-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
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 |
|
17P | Request for examination filed |
Effective date: 20031212 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
17Q | First examination report despatched |
Effective date: 20041018 |
|
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 |
|
18D | Application deemed to be withdrawn |
Effective date: 20060209 |