EP1276983A1 - Ventil zum steuern von flüssigkeiten - Google Patents
Ventil zum steuern von flüssigkeitenInfo
- Publication number
- EP1276983A1 EP1276983A1 EP01921223A EP01921223A EP1276983A1 EP 1276983 A1 EP1276983 A1 EP 1276983A1 EP 01921223 A EP01921223 A EP 01921223A EP 01921223 A EP01921223 A EP 01921223A EP 1276983 A1 EP1276983 A1 EP 1276983A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- actuating piston
- bore
- actuating
- chamber
- 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
- F02M61/167—Means for compensating clearance or thermal expansion
-
- 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
- F02M47/025—Hydraulically 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
- 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
- F02M63/0014—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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
- F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
- F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions
Definitions
- the invention is based on a valve for controlling liquids according to the type defined in claim 1.
- a valve which can be actuated via a piezoelectric actuator is already known from EP 0 477 400 A1.
- This known valve has an arrangement for an adaptive, mechanical tolerance compensation acting in the stroke direction for a displacement transformer of the piezoelectric actuator, in which the deflection of the piezoelectric actuator is transmitted via a hydraulic chamber.
- the hydraulic chamber which works as a so-called hydraulic ratio, closes between two pistons delimiting it, one of which is designed as an actuating piston with a smaller diameter and is connected to a valve-closing member to be controlled and the other piston is designed as an actuating piston with a larger diameter and with the piezoelectric actuator is connected, a common compensation volume.
- This can NEN tolerances due to temperature gradients in the component as well as possible setting effects can be compensated for without a change in the position of the valve member to be controlled.
- the hydraulic chamber is clamped between the two pistons in such a way that the actuating piston of the valve member makes a stroke which is increased by the transmission ratio of the piston diameter when the larger piston is moved by a certain distance by the piezoelectric actuator.
- the valve member, the pistons and the piezoelectric actuator lie one behind the other on a common axis.
- valves A disadvantage of such valves is, in particular, the large overall length, which results from the pistons arranged one behind the other in the longitudinal direction and is very cumbersome with a small available installation space.
- valve according to the invention for controlling liquids according to the features of claim 1 with an actuating piston, which is arranged in a blind bore of the actuating piston, and with at least one reducing element for realizing the translation advantageously requires only a very small installation space.
- the leakage losses from the hydraulic chamber can be significantly reduced with the valve according to the invention, since the sealing gaps between the actuating piston, actuating piston and reducing element which run parallel in the solution according to the invention allow far less liquid to escape than via the inevitably larger circumferential surfaces of actuators and actuators arranged in series actuating piston.
- the transmission ratio is constructive in the valve according to the invention in a particularly simple manner via the area ratios between the cross-sectional area of the actuating piston on the hydraulic chamber, ie the base area of the blind bore, and the cross-sectional area, which is composed of the cross section of the actuating piston and the cross section of the at least one reducing element, realized.
- the actuating piston can be displaced together with the at least one reducing element for a first partial length of its maximum stroke, and that the actuating piston has a remaining one in the bore of the valve body as soon as the stop for the at least one reducing element is reached Stroke runs.
- the piezoelectric actuator can also be further reduced, since the maximum actuator force is only required for a short stroke path in order to carry out the required stroke path.
- the valve is particularly suitable as a servo valve for controlling a fuel injection valve for internal combustion engines, in particular a common rail injector, in which only a very limited installation space is available and in which the servo valve must be opened against a high rail pressure , so that a predetermined flow through an injection needle through the valve seat of the valve closing member is made possible.
- valve for controlling liquids according to the invention is shown in the drawing and is explained in more detail in the following description.
- the single figure shows a schematic, partial representation of an embodiment of the invention in a fuel injection valve for internal combustion engines in longitudinal section.
- the embodiment shown in the figure shows a use of the valve according to the invention in a fuel injection valve 1 for internal combustion engines of motor vehicles.
- the fuel injection valve 1 is designed as a common rail injector, the injection of diesel fuel being controlled via the pressure level in a valve control chamber 12 which is connected to a high pressure supply.
- a multi-part valve member 2 is actuated via a piezoelectric unit designed as a piezoelectric actuator 3, the piezoelectric actuator 3 on the side of the valve member facing away from the valve control chamber and combustion chamber 2 is arranged.
- the piezoelectric actuator 3 constructed in a manner known per se from several layers has an actuator head 4 on its side facing the valve member 2 and is supported on a valve body 5 on the side facing away from the valve member.
- a control piston 7 of the valve member 2 rests on a support 6.
- the valve member 2 is axially displaceable in a bore 8 of the valve body 5 designed as a longitudinal bore and, in addition to the actuating piston 7, also comprises an actuating piston 10 actuating a valve closing member 9, the actuating piston 7 and the actuating piston 10 being coupled to one another by means of a hydraulic transmission.
- the hydraulic transmission is designed with a hydraulic chamber 11, via which the deflection of the piezoelectric actuator 3 is transmitted.
- the hydraulic chamber 11 is formed in a blind bore 13 of the actuating piston 7 which is open in the valve seat direction and in which the actuating piston 10 is slidably mounted and thereby delimits the hydraulic chamber 11 in the valve seat direction.
- the transmission ratio results from the ratio between the cross-sectional area A0 of the actuating piston 7 bordering the hydraulic chamber 11 on the one hand and the smaller cross-sectional area AI of the actuating piston 10 on the other hand.
- a reduction element 14 designed as a bolt is provided on the actuating piston 10 side, which is inserted into a through-bore 17 formed axially in the actuating piston 10 and with a cross-sectional area A2 borders the hydraulic chamber 11.
- the length of the bolt 14 is selected to be greater than the length of a region 10A of the actuating piston 10 with the cross-sectional area AI bordering on the compensation volume of the hydraulic chamber 11.
- the cross section of the actuating piston 10 tapers from this area 10A against a contact surface 16 for the valve closing member 9.
- the reducing element 14 can also be made somewhat shorter in the valve seat direction, so that a stepped translation is possible in which the actuating piston 10 initially together with the reducing element 14 for a first partial length of its maximum stroke is displaceable, namely until the reducing element comes to rest on the stop 15, which is preferably formed on a dividing surface of the split valve body 5.
- the stop 15 which is preferably formed on a dividing surface of the split valve body 5.
- valve closing member 9 which in the present case is designed with ball caps and is provided on the end of the valve member 2 on the valve control chamber side, interacts with valve seats 19, 20 formed on the valve body 5, with the lower valve seat 20 being associated with a spring device 21 which the valve closing member 9 stops at the upper valve seat 19 when the valve control chamber 12 is relieved.
- the valve seats 19, 20 are formed in a first valve chamber 22 formed in the valve body 5, which has a leakage outlet channel 23 and a valve system pressure chamber 24 leading compensation channel 25 of a filling device 26 is connected.
- valve closing member 9 which of course can also cooperate with only one valve seat in an alternative embodiment, separates a low-pressure region 27 with a system pressure from a high-pressure region 28 with a high pressure or rail pressure.
- the bore 8 is followed by a second valve chamber 29, which is delimited on the one hand by the valve body 5 and on the other hand by a sealing element 30 connected to the actuating piston 7 and the valve body 5, the sealing element 30 in the present case being a bellows - Term membrane is formed and prevents the piezoelectric actuator 3 from coming into contact with the fuel contained in the low pressure region 27.
- the hydraulic chamber 11 is refilled with hydraulic fluid from the high-pressure region 28 during a pause in the activation or energization of the piezoelectric actuator 3 to compensate for a leakage quantity in the low-pressure region 27.
- a channel-like cavity 31 opens into the system pressure chamber 24 of the low-pressure region 27, which is designed as a bore in a region 7A of the actuating piston 7 surrounding the actuating piston 10 between a gap 32 surrounding the actuating piston 7 and a gap 33 surrounding the actuating piston 10.
- the filling device 26 can have a suitable throttling in relation to the high-pressure region 28 and a suitable device for releasing excess pressure.
- the fuel injection valve 1 operates in the manner described below.
- valve closing member 9 of the valve member 2 is held in contact with the upper valve seat 19 by the high pressure or rail pressure in the high pressure region 28, so that no fuel from the high pressure storage space (common rail) common to a plurality of fuel injection valves. connected valve control chamber 12 can get into the first valve chamber 22 and then escape through the leakage drain channel 23.
- the actuating piston 7 presses in the valve seat direction while reducing the compensation volume of the hydraulic chamber 11 and retracts accordingly when the temperature drops, without this having any effect on the closing and Open position of the valve member 2 and the fuel valve 1 has a total.
- the valve closing member 9 must be opened against the direction of flow and thus against the rail pressure in the high pressure region 28. The actuator force required for this is generated by the piezoelectric actuator 3, which suddenly expands axially when energized and builds up a certain pressure in the hydraulic chamber 11 by displacing the actuating piston 7 in the valve seat direction.
- a hydraulic force which corresponds to the force of the piezoelectric actuator 3 is thus exerted on the actuating piston 10 and the reducing element or the bolt 14 via the hydraulic chamber 11. Since the reducing element 14 is supported on the shoulder 15 in the bore 8 of the valve body 5 in the embodiment shown, only the actuating piston 10 is moved by a greater stroke, the larger the cross-sectional area A2 of the reducing element 14 compared to the cross-sectional area AI of the actuating piston 10 is.
- valve closing member 9 is brought into a central position between the two valve seats 19, 20 and then moved into a closed position on the lower valve seat 20, as a result of which no fuel reaches the first valve chamber 22 from the valve control chamber 12.
- valve closing member 9 If the energization of the piezoelectric actuator 3 is interrupted, it shortens again, and the valve closing member 9 is brought into the central position between the two valve seats 19, 20, with one ne fuel injection takes place. After the pressure reduction in the valve chamber 22 through the leakage drain channel 23, the valve closing member 9 moves into its closed position to the upper valve seat 19, in which it is held by the spring device 21.
- the exemplary embodiment relates to a non-force-balanced fuel injection valve
- the invention can of course also be used in force-balanced designed valves.
- the invention is also not limited to fuel injection valves, but is suitable for all valves with a piezoelectric actuator system in which a valve closing member separates a high pressure area from a low pressure area, such as e.g. in pumps.
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)
- Control Of Non-Electrical Variables (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10019767A DE10019767A1 (de) | 2000-04-20 | 2000-04-20 | Ventil zum Steuern von Flüssigkeiten |
DE10019767 | 2000-04-20 | ||
PCT/DE2001/001074 WO2001081751A1 (de) | 2000-04-20 | 2001-03-21 | Ventil zum steuern von flüssigkeiten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1276983A1 true EP1276983A1 (de) | 2003-01-22 |
EP1276983B1 EP1276983B1 (de) | 2005-07-06 |
Family
ID=7639568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01921223A Expired - Lifetime EP1276983B1 (de) | 2000-04-20 | 2001-03-21 | Ventil zum steuern von flüssigkeiten |
Country Status (7)
Country | Link |
---|---|
US (1) | US6651950B2 (de) |
EP (1) | EP1276983B1 (de) |
JP (1) | JP2003532000A (de) |
AT (1) | ATE299239T1 (de) |
CZ (1) | CZ20014520A3 (de) |
DE (2) | DE10019767A1 (de) |
WO (1) | WO2001081751A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10145620B4 (de) * | 2001-09-15 | 2006-03-02 | Robert Bosch Gmbh | Ventil zum Steuern von Flüssigkeiten |
DE102004005456A1 (de) * | 2004-02-04 | 2005-08-25 | Robert Bosch Gmbh | Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied |
US7100577B2 (en) * | 2004-06-14 | 2006-09-05 | Westport Research Inc. | Common rail directly actuated fuel injection valve with a pressurized hydraulic transmission device and a method of operating same |
DE102009027187A1 (de) * | 2009-06-25 | 2010-12-30 | Robert Bosch Gmbh | Kraftstoffinjektor |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0477400B1 (de) * | 1990-09-25 | 2000-04-26 | Siemens Aktiengesellschaft | Anordnung für einen in Hubrichtung wirkenden adaptiven, mechanischen Toleranzausgleich für den Wegtransformator eines piezoelektrischen Aktors |
DE4406522C1 (de) * | 1994-02-28 | 1995-07-13 | Siemens Ag | Elektrohydraulisches Antriebselement |
DE19500706C2 (de) | 1995-01-12 | 2003-09-25 | Bosch Gmbh Robert | Zumeßventil zur Dosierung von Flüssigkeiten oder Gasen |
DE19732802A1 (de) * | 1997-07-30 | 1999-02-04 | Bosch Gmbh Robert | Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen |
DE19821768C2 (de) * | 1998-05-14 | 2000-09-07 | Siemens Ag | Dosiervorrichtung und Dosierverfahren |
DE19946833C2 (de) * | 1999-09-30 | 2002-02-21 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
DE19946827C1 (de) * | 1999-09-30 | 2001-06-21 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
DE19946838C1 (de) * | 1999-09-30 | 2000-10-19 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
DE19946830A1 (de) * | 1999-09-30 | 2001-05-03 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
-
2000
- 2000-04-20 DE DE10019767A patent/DE10019767A1/de not_active Ceased
-
2001
- 2001-03-21 JP JP2001578809A patent/JP2003532000A/ja active Pending
- 2001-03-21 DE DE50106694T patent/DE50106694D1/de not_active Expired - Fee Related
- 2001-03-21 US US10/018,655 patent/US6651950B2/en not_active Expired - Fee Related
- 2001-03-21 WO PCT/DE2001/001074 patent/WO2001081751A1/de not_active Application Discontinuation
- 2001-03-21 CZ CZ20014520A patent/CZ20014520A3/cs unknown
- 2001-03-21 AT AT01921223T patent/ATE299239T1/de not_active IP Right Cessation
- 2001-03-21 EP EP01921223A patent/EP1276983B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0181751A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001081751A1 (de) | 2001-11-01 |
CZ20014520A3 (cs) | 2003-03-12 |
DE10019767A1 (de) | 2001-10-31 |
ATE299239T1 (de) | 2005-07-15 |
US20030098429A1 (en) | 2003-05-29 |
JP2003532000A (ja) | 2003-10-28 |
DE50106694D1 (de) | 2005-08-11 |
US6651950B2 (en) | 2003-11-25 |
EP1276983B1 (de) | 2005-07-06 |
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