EP1070201A1 - Injektor mit piezo-mehrlagenaktor für einspritzsysteme - Google Patents
Injektor mit piezo-mehrlagenaktor für einspritzsystemeInfo
- Publication number
- EP1070201A1 EP1070201A1 EP00907452A EP00907452A EP1070201A1 EP 1070201 A1 EP1070201 A1 EP 1070201A1 EP 00907452 A EP00907452 A EP 00907452A EP 00907452 A EP00907452 A EP 00907452A EP 1070201 A1 EP1070201 A1 EP 1070201A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector
- actuator
- bore
- cross
- actuator body
- 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
- 238000002347 injection Methods 0.000 title claims abstract description 8
- 239000007924 injection Substances 0.000 title claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 1
- 230000036316 preload 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
Definitions
- the invention is based on an injector with a piezo
- Multi-layer actuator for injection systems in particular an injector, which can be used in "common rail" diesel injection systems of motor vehicles, the body of the piezo actuator having a square or rectangular cross-sectional contour and together with a two-legged pretensioning bracket which is attached along opposite outer sides of the actuator body , sits within a longitudinal bore of the injector body.
- an injector is e.g. B. known from DE 40 36 287 C2.
- FIG. 1 shows in a schematic longitudinal section A and in a cross section B schematically such an injector, in which an actuator forming a multilayer piezo body 1 is provided within an injector body 2
- Actuation of a plunger (not shown) of the injector is resiliently clamped between its opposite end faces by means of two tensioning brackets designed as spring bands 3a, 3b.
- the square actuator body 1 sits in a cylindrical longitudinal bore 5 of the injector body 2.
- electrodes and contact tracks 4 are attached to the long sides of the actuator body 1.
- the long sides of the actuator body 1 used for contacting are those on which the tensioning brackets 3a, 3b do not run along.
- piezo actuators as shown in Figure 1, can be produced most inexpensively in a rectangular or square shape. This is due to the fact that the actuator bodies are produced with greater utility and are ultimately sawn into individual actuators. With a short design of a "common rail" injector with such a rectangular or square piezo actuator, the smallest possible outer diameter of the injector body in the cylinder head of an internal combustion engine is important. Usual outside diameters are approximately 19 to 21 mm.
- the actuator body including its pretensioning bracket, the electrode contact and a high-pressure bore (not shown in FIG. 1) leading to the nozzle of the injector must be introduced into this diameter.
- a rectangular or square inner bore with rounded corners enables the actuator body with a square or rectangular outer contour, together with its pretensioning brackets, to be relatively narrow from the Inner bore of the injector body are enclosed, at the same time creating space for the high pressure bore in the injector body.
- the high pressure bore in the injector body is guided along one of the sides of the actuator body on which there is no leg of the pretensioning bracket.
- the high-pressure bore can also be located opposite the leakage oil bore in the injector body, axially parallel to the longitudinal axis of the injector body.
- the actuator body 'does not have to be square, but may have a rectangular cross-sectional contour.
- the two legs of the pretensioning bracket can run along the two longer rectangular sides of the actuator body, the contact tracks then being on the other two, ie short, rectangular sides of the actuator body.
- the inner longitudinal bore of the injector body can also be designed such that both the legs of the pretensioning bracket and the contact tracks are guided along the same rectangular sides of the actuator body.
- the cross-sectional shape of the inner longitudinal bore in the injector body can also be rounded such that two parallel cross-sections on two parallel side walls of the inner longitudinal bore connect about circular side walls.
- This hole can also be made by broaching by broaching or by electrochemical removal.
- Figure 1 shows the known injector already described, the injector body has a circular cylindrical inner longitudinal bore.
- Figures 2 to 6 each show schematically in cross section a central section of an injector according to the invention with differently designed actuator bodies and differently arranged pretensioning brackets.
- FIG. 7 shows a longitudinal section of the embodiment of an injector according to the invention shown in FIG. 4.
- the first exemplary embodiment of the injector according to the invention shown schematically in the form of a cross section in FIG. 2, contains a multilayer piezoelectric actuator within a rectangular longitudinal bore 9 with rounded corners of an injector body 10, the body 11 of which in the cross section shown has a square outer contour with the sides a, b, c and d has.
- Preload brackets 12 project along sides a and c and clamp actuator body 11 between its end faces (which cannot be seen).
- the cross-sectional contour of the inner longitudinal bore 9 of the injector body 10 is selected so that on the other opposite rectangular sides b and d of the actuator body 11 there is still space for contact bars 15 in the injector body outside the inner longitudinal bore 9 for a high pressure bore 14 and an opposite leak oil bore 16, both of which sides b and d of the actuator body 11 opposite and guide in the direction of the longitudinal axis of the injector body.
- the second embodiment of an injector according to the invention 11 is seated a square actuator body within ⁇ a rounded rectangular inner longitudinal bore 19 of an injector 20.
- the position of the opposing leg 12 of the biasing clip which contact bars 15, the high-pressure bore 14 and the leakage oil bore 16 are the same as in FIG. 2.
- the cross-sectional contour of the inner longitudinal bore 19 in the injector body 20 is different from that in FIG. 2, because the ' two parallel sides of the rectangle are connected by two particularly circular sides which are arcuate in cross-section, the two circular sides being concentric with the outer contour of the injector body 20 can run.
- the third exemplary embodiment of an injector according to the invention shown in cross section in FIG. 4 has a clearly rectangular actuator body 11 instead of a square one, and the opposing legs of the pretensioning bracket 12 extend along the (in cross section) longer rectangular sides b and d of the actuator body 11, while the high-pressure bore 14 and the leak oil hole 14 and the contact webs 15 lie along the shorter sides of the rectangle a and c of the actuator body 11.
- the cross-sectional contour of the inner longitudinal bore 39 of an injector body 40 again has a shape as is already provided in the second exemplary embodiment in FIG. 3, and the two legs of the pretensioning bracket 12 and both contact webs 15 extend along the (in Cross section) longer sides of the rectangle b and d of Actuator body 11, which, as in Figure 4, is not square but rectangular.
- the high pressure bore 14 and the leak oil bore 16 run along the (in cross section) shorter rectangle sides a and c of the actuator body 11.
- FIG. 7 finally shows in longitudinal section the exemplary embodiment of an injector according to the invention shown in cross section in FIG. 4.
- the contact webs 15 are located in front of and behind the actuator body 11 and also the leakage oil hole and the high pressure hole, so that they are not visible in FIG. 7.
- FIG. 7 clearly shows the position and function of the pretensioning brackets, which hold the two end faces of the actuator body under pretension.
- the actuator body need not be square.
- the “common rail” injector according to the invention described above advantageously enables a short design of the actuator while at the same time optimizing the space requirement of the injector within the cylinder head of an internal combustion engine.
- the rounded cross-sectional contour of the inner longitudinal bore of the injector body can also create additional space for the high-pressure bore in the injector body and the leak oil bore.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19905413A DE19905413A1 (de) | 1999-02-10 | 1999-02-10 | Injektor mit Piezo-Mehrlagenaktor für Einspritzsysteme |
DE19905413 | 1999-02-10 | ||
PCT/DE2000/000214 WO2000047887A1 (de) | 1999-02-10 | 2000-01-26 | Injektor mit piezo-mehrlagenaktor für einspritzsysteme |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1070201A1 true EP1070201A1 (de) | 2001-01-24 |
EP1070201B1 EP1070201B1 (de) | 2004-04-07 |
Family
ID=7896984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00907452A Expired - Lifetime EP1070201B1 (de) | 1999-02-10 | 2000-01-26 | Injektor mit piezo-mehrlagenaktor für einspritzsysteme |
Country Status (6)
Country | Link |
---|---|
US (1) | US6315216B1 (de) |
EP (1) | EP1070201B1 (de) |
JP (1) | JP2002536591A (de) |
AT (1) | ATE263923T1 (de) |
DE (2) | DE19905413A1 (de) |
WO (1) | WO2000047887A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19906467A1 (de) * | 1999-02-16 | 2000-08-24 | Bosch Gmbh Robert | Injektor mit einem Piezo-Mehrlagenaktor |
DE60142818D1 (de) * | 2000-05-31 | 2010-09-30 | Denso Corp | Piezoelektrisches Bauelement für eine Einspritzvorrichtung |
DE10140196A1 (de) * | 2001-08-16 | 2003-03-13 | Bosch Gmbh Robert | Hülsenförmiger Hohlkörper für ein Piezoaktormodul sowie Verfahren zu dessen Herstellung |
US6811093B2 (en) * | 2002-10-17 | 2004-11-02 | Tecumseh Products Company | Piezoelectric actuated fuel injectors |
US20050258715A1 (en) * | 2004-05-19 | 2005-11-24 | Schlabach Roderic A | Piezoelectric actuator having minimal displacement drift with temperature and high durability |
DE102005024710A1 (de) * | 2005-05-30 | 2006-12-07 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
DE102005046440B4 (de) * | 2005-09-28 | 2007-07-19 | Siemens Ag | Spannfeder |
US7703479B2 (en) * | 2005-10-17 | 2010-04-27 | The University Of Kentucky Research Foundation | Plasma actuator |
US7861977B1 (en) | 2006-03-13 | 2011-01-04 | The United States Of America As Represented By The Secretary Of The Navy | Adaptive material actuators for Coanda effect circulation control slots |
DE102006014251A1 (de) * | 2006-03-28 | 2007-10-04 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102006026152A1 (de) * | 2006-06-06 | 2007-12-13 | Robert Bosch Gmbh | Anordnung mit einem beschichteten Piezoaktor |
US7531944B2 (en) * | 2007-02-09 | 2009-05-12 | Delphi Technologies, Inc. | Piezoelectric actuator and enclosure therefor |
DE102009020270A1 (de) * | 2009-05-07 | 2010-11-11 | Continental Automotive Gmbh | Aktoreinheit |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4471256A (en) | 1982-06-14 | 1984-09-11 | Nippon Soken, Inc. | Piezoelectric actuator, and valve apparatus having actuator |
JPS59206671A (ja) * | 1983-05-11 | 1984-11-22 | Nippon Soken Inc | 電歪素子による制御弁装置 |
JPS6053660A (ja) * | 1983-09-02 | 1985-03-27 | Nippon Soken Inc | 燃料噴射弁 |
DE3533975A1 (de) | 1985-09-24 | 1987-03-26 | Bosch Gmbh Robert | Zumessventil zur dosierung von fluessigkeiten oder gasen |
US4803393A (en) | 1986-07-31 | 1989-02-07 | Toyota Jidosha Kabushiki Kaisha | Piezoelectric actuator |
JPH01100973U (de) * | 1987-12-25 | 1989-07-06 | ||
US5004945A (en) | 1988-09-26 | 1991-04-02 | Nippondenso Co., Ltd. | Piezoelectric type actuator |
JPH0335258U (de) * | 1989-08-15 | 1991-04-05 | ||
US5092360A (en) * | 1989-11-14 | 1992-03-03 | Hitachi Metals, Ltd. | Flow rated control valve using a high-temperature stacked-type displacement device |
EP0445340B1 (de) | 1990-03-09 | 1994-12-14 | Siemens Aktiengesellschaft | Ventil mit piezoelektrischem Antrieb |
JPH05110155A (ja) * | 1991-10-21 | 1993-04-30 | Nec Corp | 電歪効果素子 |
JPH05218523A (ja) * | 1992-01-08 | 1993-08-27 | Nec Corp | 簡易外装型電歪効果素子 |
US5248087A (en) | 1992-05-08 | 1993-09-28 | Dressler John L | Liquid droplet generator |
JPH0974233A (ja) * | 1995-09-01 | 1997-03-18 | Denso Corp | 積層型圧電装置 |
DE19548526A1 (de) * | 1995-12-22 | 1997-07-03 | Daimler Benz Ag | Einspritzventil |
DE19650900A1 (de) * | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | Piezoelektrischer Aktuator |
DE19702066C2 (de) | 1997-01-22 | 1998-10-29 | Daimler Benz Ag | Piezoelektrischer Injektor für Kraftstoffeinspritzanlagen von Brennkraftmaschinen |
DE19715487C2 (de) * | 1997-04-14 | 2002-06-13 | Siemens Ag | Piezoelektrischer Aktor mit einem Hohlprofil |
DE19744235A1 (de) * | 1997-10-07 | 1999-04-08 | Fev Motorentech Gmbh & Co Kg | Einspritzdüse mit piezoelektrischem Aktuator |
DE69911670T2 (de) * | 1998-02-19 | 2004-08-12 | Delphi Technologies, Inc., Troy | Kraftstoffeinspritzventil |
-
1999
- 1999-02-10 DE DE19905413A patent/DE19905413A1/de not_active Ceased
-
2000
- 2000-01-26 US US09/673,023 patent/US6315216B1/en not_active Expired - Fee Related
- 2000-01-26 WO PCT/DE2000/000214 patent/WO2000047887A1/de active IP Right Grant
- 2000-01-26 AT AT00907452T patent/ATE263923T1/de not_active IP Right Cessation
- 2000-01-26 DE DE50005959T patent/DE50005959D1/de not_active Expired - Lifetime
- 2000-01-26 JP JP2000598764A patent/JP2002536591A/ja active Pending
- 2000-01-26 EP EP00907452A patent/EP1070201B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0047887A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50005959D1 (de) | 2004-05-13 |
ATE263923T1 (de) | 2004-04-15 |
JP2002536591A (ja) | 2002-10-29 |
WO2000047887A1 (de) | 2000-08-17 |
EP1070201B1 (de) | 2004-04-07 |
DE19905413A1 (de) | 2000-08-24 |
US6315216B1 (en) | 2001-11-13 |
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