EP1442210A1 - Brennstoffeinspritzventil - Google Patents
BrennstoffeinspritzventilInfo
- Publication number
- EP1442210A1 EP1442210A1 EP02767123A EP02767123A EP1442210A1 EP 1442210 A1 EP1442210 A1 EP 1442210A1 EP 02767123 A EP02767123 A EP 02767123A EP 02767123 A EP02767123 A EP 02767123A EP 1442210 A1 EP1442210 A1 EP 1442210A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel injection
- injection valve
- valve according
- actuator
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 54
- 238000002347 injection Methods 0.000 title claims abstract description 26
- 239000007924 injection Substances 0.000 title claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005538 encapsulation Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002918 waste heat Substances 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
Definitions
- the invention relates to a fuel injector according to the preamble of the main claim.
- a fuel injector is known from DE 195 34 445 C2, which has an axially movable valve needle in a nozzle body, which can be actuated by a piezoelectric actuator and is held in the closed position by a compression spring.
- the fuel is supplied from an external source with freely adjustable pressure.
- the valve needle has a central bore.
- the piezoelectric actuator concentrically surrounds the valve needle and is sealed against the fuel pressure by sealing surfaces.
- a disadvantage of the fuel injector known from DE 195 34 -445 C2 is in particular that the encapsulation of the piezoelectric actuator, which must be sealed against the aggressive fuel and against the pressure of the fuel, is complex and cost-intensive. It is also difficult to compensate for thermal changes in length of the actuator and subsequent malfunctions of the fuel injector.
- the main claim has the advantage that the piezoelectric or magnetostrictive actuator in an actuator housing and the nozzle body in which the actuator housing is arranged can be locked together by a connecting part which has diameter steps which can be connected to the actuator housing and the nozzle body.
- the diameter steps have different radial diameters, as a result of which the actuator housing and the nozzle body are spaced apart, so that the fuel can be guided to the sealing seat without bores in the housing.
- the piezoelectric actuator is advantageously acted upon by a closing spring which is arranged between an end plate of the actuator and a shoulder of the actuator housing.
- Another advantage is that the connecting part can be produced in a simple and inexpensive manner by turning.
- Fig. 1 shows a schematic section through a
- FIG. 1 An exemplary embodiment of a fuel injection valve 1 according to the invention shown in FIG. 1 is in the form of a fuel injection valve 1 for
- Fuel injection systems made by mixture-compressing, spark-ignited internal combustion engines.
- Fuel injection valve 1 is particularly suitable for the direct injection of fuel into a combustion chamber, not shown, of an internal combustion engine.
- the fuel fine injection valve 1 comprises a piezoelectric actuator 2, which is encapsulated in an actuator housing 3.
- the actuator housing 3 is closed on the inlet side by a connecting part 4, which can be produced inexpensively, for example, by turning.
- the connecting part 4 has a fuel inlet 5 and an electrical connection (not shown further) for actuating the piezoelectric actuator 2.
- the piezoelectric actuator 2 is supported on the downstream side on an end plate 6, on the other side of which a closing spring 7 is arranged.
- the closing spring 7 is supported between the end plate 6 and a shoulder 8 of the actuator housing 3 and acts on a valve needle 9 which is in a non-positive connection with the end plate 6 with a closing force which keeps the fuel fine injection valve 1 closed when the piezoelectric actuator 2 is deenergized.
- valve needle 9 passes through the closing spring 7 and a recess 10 in the shoulder 8 of the actuator housing 3.
- a valve closing body 11 is formed at an outflow end of the valve needle 9, which forms a sealing seat with a valve seat surface 13 formed on a nozzle body 12.
- the actuator housing 3 In the nozzle body 12 is the actuator housing 3 with the connector 4 inserted therein on the inlet side arranged.
- the nozzle body 12 is also plugged onto the connector 4 all s.
- the connecting part 4 has a first diameter step 19, on which the actuator housing 3 is attached, and a second diameter step 20, on which the nozzle body 12 is attached. Characterized in that the radial diameter of the first diameter step 19 is smaller than that of the second diameter step 20, an annular space 14 is formed between the actuator housing 3 and the nozzle body 12, through which the fuel supplied via the fuel supply 5 is passed to the sealing seat , In the connector 4 is for connection between the
- Fuel supply 5 and the intermediate space 14 at least one fuel channel 15 is formed.
- the encapsulation of the piezoelectric actuator 2 described in the actuator housing 3 and the joint termination of the actuator housing 3 and the nozzle body 12 by the connecting part 4 is characterized in particular by their simple and inexpensive construction. Sealing can be done without additional elastomer seals.
- the connecting part 4 can be produced in a simple manner by turning and, in addition to the fuel supply 5, can also accommodate the electrical line for 'excitation of the piezoelectric actuator 2, so that bores in the housing can be eliminated.
- the waste heat generated during operation of the piezoelectric actuator 2 can also be dissipated by the fuel f flowing past the actuator housing 3 and can be used, for example, to preheat the fuel.
- the actuator housing 3 is pushed onto the connecting part 4 until the required spring force is reached. An adjustment gap 16 is established.
- the actuator housing 3 is then connected to the connecting part 4, for example by means of a weld seam 17.
- the nozzle body 12 is also connected to the connecting part 4, for example via a weld seam 18.
- the piezoelectric actuator 2 If the piezoelectric actuator 2 is excited by an electrical voltage that can be supplied from the outside, it expands against the spring force of the closing spring 7 in an outflow direction of the fuel. As a result, the face plate 6 stationary valve needle 9 also shifts with the • operatively connected in the outflow.
- the invention is not limited to the illustrated embodiment and z. B. also suitable for fuel injectors 1 with magnetostrictive actuators or for inward opening fuel injectors 1.
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 (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10153630A DE10153630A1 (de) | 2001-10-31 | 2001-10-31 | Brennstoffeinspritzventil |
DE10153630 | 2001-10-31 | ||
PCT/DE2002/003093 WO2003040545A1 (de) | 2001-10-31 | 2002-08-23 | Brennstoffeinspritzventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1442210A1 true EP1442210A1 (de) | 2004-08-04 |
EP1442210B1 EP1442210B1 (de) | 2009-08-05 |
Family
ID=7704269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02767123A Expired - Lifetime EP1442210B1 (de) | 2001-10-31 | 2002-08-23 | Brennstoffeinspritzventil |
Country Status (5)
Country | Link |
---|---|
US (1) | US7063278B2 (de) |
EP (1) | EP1442210B1 (de) |
JP (1) | JP4280633B2 (de) |
DE (2) | DE10153630A1 (de) |
WO (1) | WO2003040545A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4002229B2 (ja) * | 2003-10-03 | 2007-10-31 | 株式会社日立製作所 | 燃料噴射弁 |
DE102006013510B4 (de) * | 2006-03-23 | 2008-08-14 | Siemens Ag | Drucktransfervorrichtung |
EP1884654B1 (de) * | 2006-07-25 | 2009-03-18 | Continental Automotive GmbH | Piezoaktoreinheit für ein Einspritzventil |
JP4849096B2 (ja) * | 2008-06-06 | 2011-12-28 | 株式会社デンソー | 燃料噴射弁 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63207185A (ja) * | 1987-02-23 | 1988-08-26 | Toyota Motor Corp | 圧電アクチユエ−タ |
US5692723A (en) * | 1995-06-06 | 1997-12-02 | Sagem-Lucas, Inc. | Electromagnetically actuated disc-type valve |
DE19534445C2 (de) | 1995-09-16 | 1998-07-30 | Man Nutzfahrzeuge Ag | Einspritzventil für Brennkraftmaschinen |
EP0869278B1 (de) * | 1997-04-04 | 2004-03-24 | Siemens Aktiengesellschaft | Einspritzventil mit Mitteln zur Kompensation der thermischen Längenänderung eines Piezoaktors |
DE19921489A1 (de) | 1999-05-08 | 2000-11-09 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE19925102B4 (de) * | 1999-06-01 | 2013-12-12 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
DE19928204A1 (de) | 1999-06-19 | 2000-12-21 | Bosch Gmbh Robert | Brennstoffeinspritzventil |
DE19943142A1 (de) | 1999-09-09 | 2001-04-12 | Siemens Ag | Dosiervorrichtung |
DE19947079B4 (de) * | 1999-09-30 | 2006-12-28 | Siemens Ag | Geräuschgedämpfter Stellantrieb für einen Kraftstoffinjektor |
DE19956256B4 (de) * | 1999-11-23 | 2004-04-08 | Siemens Ag | Leerhubeinstellung zwischen einem Aktor und einem Übertragungselement eines Ventils in einem Kraftstoffinjektor |
DE19958704C2 (de) * | 1999-12-06 | 2002-10-02 | Siemens Ag | Vorrichtung zum Übertragen einer Aktorbewegung und Fluiddosierer mit einer solchen Vorrichtung |
-
2001
- 2001-10-31 DE DE10153630A patent/DE10153630A1/de not_active Withdrawn
-
2002
- 2002-08-23 US US10/250,531 patent/US7063278B2/en not_active Expired - Fee Related
- 2002-08-23 EP EP02767123A patent/EP1442210B1/de not_active Expired - Lifetime
- 2002-08-23 JP JP2003542774A patent/JP4280633B2/ja not_active Expired - Fee Related
- 2002-08-23 DE DE50213748T patent/DE50213748D1/de not_active Expired - Lifetime
- 2002-08-23 WO PCT/DE2002/003093 patent/WO2003040545A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO03040545A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2005508476A (ja) | 2005-03-31 |
US7063278B2 (en) | 2006-06-20 |
EP1442210B1 (de) | 2009-08-05 |
JP4280633B2 (ja) | 2009-06-17 |
WO2003040545A1 (de) | 2003-05-15 |
DE50213748D1 (de) | 2009-09-17 |
DE10153630A1 (de) | 2003-07-10 |
US20040094640A1 (en) | 2004-05-20 |
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