EP1117922B1 - Common-rail-injektor - Google Patents
Common-rail-injektor Download PDFInfo
- Publication number
- EP1117922B1 EP1117922B1 EP00962184A EP00962184A EP1117922B1 EP 1117922 B1 EP1117922 B1 EP 1117922B1 EP 00962184 A EP00962184 A EP 00962184A EP 00962184 A EP00962184 A EP 00962184A EP 1117922 B1 EP1117922 B1 EP 1117922B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- space
- nozzle
- fuel
- pressure
- nozzle 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.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 claims abstract description 32
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
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
- 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
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
Definitions
- the invention relates to a common rail injector for Injection of fuel in a common rail injection system an internal combustion engine, the one Injector housing having a fuel inlet, the with a central high-pressure fuel storage outside the injector housing and with a pressure chamber within the Injector housing communicates, from the high pressure applied fuel depending on the position a control valve is injected, which ensures that in a longitudinal bore of the injector axially against the biasing force of a nozzle spring in a Nozzle spring space is included, reciprocable Nozzle needle lifts off a seat when the pressure in the Pressure chamber is greater than the pressure in a control room, the via an inlet throttle with the fuel inlet and over a fuel drain connected to a discharge space is.
- common-rail injection systems promotes a High pressure pump the fuel in the central High-pressure accumulator, which is referred to as common rail. From The high-pressure lines lead to the rail to the individual Injectors associated with the engine cylinders. The Injectors are individually from the engine electronics driven. The rail pressure is in the pressure chamber and at the Control valve on. When the control valve opens, gets high pressure acted upon fuel against the biasing force of the Nozzle spring lifted nozzle needle over into the combustion chamber.
- the object of the invention is to provide a common rail injector of the above To provide described type, the simple design and is inexpensive to produce. In particular, should also at high Nozzle needle speeds ensured a good closing behavior be.
- This task is with a common rail injector for the injection of Fuel in a common rail injection system according to the preamble the claim 1 solved by that solved in that at the combustion chamber remote end of the sleeve a Auxiliary control space is formed, via the inlet throttle with the Nozzle spring chamber and an auxiliary throttle with the cylindrical Recess in the nozzle needle is in communication, and that the Fuel outlet opens into the auxiliary control chamber.
- This injector can be used during the closing movement the nozzle needle removes the sleeve from its seat from the injector housing take off. This has the consequence that the auxiliary control room and the actual control room forming cylindrical recess faster can be filled with high-pressure fuel. As a result, the closing movement of the nozzle needle is further accelerated.
- the inventive design of the injector allows rail pressures of up to 1,800 bar.
- a particular embodiment of the invention is characterized in that in the combustion chamber remote end of the nozzle needle a essentially cylindrical recess is provided in the one outer peripheral portion of a sleeve under sealing effect axially slidably received, the combustion chamber remote end face through the biasing force of the nozzle spring pressed against the injector is, and whose interior in communication with the fuel drain stands.
- the sleeve provides the advantage that the control room and the Nozzle spring chamber combined at the combustion chamber remote end of the nozzle needle can be, without the volume of the control room of the installation space the nozzle spring depends. Therefore it is possible to use a nozzle spring To install a high spring stiffness, the good closing of the Nozzle needle guaranteed. This allows the duration of injection and the Injection time to be set exactly.
- Another particular embodiment of the invention is characterized in that at the combustion chamber remote end of the sleeve a collar is formed, which forms an abutment for the nozzle spring, the is biased against the combustion chamber remote end of the nozzle needle.
- a collar is formed, which forms an abutment for the nozzle spring, the is biased against the combustion chamber remote end of the nozzle needle.
- Closing movement of the nozzle needle causes and secondly by the Preload force of the nozzle spring in conjunction with the pressure in the control chamber set the control room volume.
- Another particular embodiment of the invention is characterized in that at the combustion chamber remote end face of the sleeve, the is in abutment with the injector housing, a biting edge is trained. This ensures that the control room of the the sleeve surrounding nozzle spring space is separated.
- Another particular embodiment of the invention is characterized characterized in that the power supply via the nozzle spring chamber with the Pressure chamber communicates, and that the nozzle needle between the Nozzle spring chamber and the pressure chamber is guided. That provides the advantage that the nozzle needle guide no longer has a sealing function. In order to the quality requirements of the leadership are reduced, resulting in Saving in production leads. Because on both sides of the leadership the same pressure prevails, moreover, there is no more pilot leakage on.
- Another particular embodiment of the invention is characterized characterized in that at the nozzle needle between the nozzle spring chamber and the pressure chamber is formed at least one flat at the passing fuel from the nozzle spring chamber into the pressure chamber can.
- This embodiment offers particular in relation to the High pressure resistance advantages.
- Another particular embodiment of the invention is characterized characterized in that the inlet throttle in the nozzle needle or in the Sleeve is integrated.
- the inlet throttle serves to provide pressure surges in the Prevent operation.
- Another particular embodiment of the invention is characterized characterized in that the nozzle needle stroke by the axial distance is defined between the nozzle needle and the sleeve.
- This pure Mechanical Düsennadelhubendanschlag provides the advantage that de Düsennadelhub is exactly reproducible. This allows the Injection course can be reliably shaped. A so-called Hydraulic bonding is avoided.
- the example shown in Fig. 1 in longitudinal section of a not inventive injector has a total of 1 designated injector on.
- the Injector housing 1 comprises a nozzle body 2, which with its free end into the combustion chamber of the to be supplied Internal combustion engine protrudes. With his brennraumfernen End face of the nozzle body 2 by means of a (not shown) clamping nut axially against a holding body. 3 braced.
- an axial guide bore 4 is recessed.
- a nozzle needle 5 is guided with a tip 6 axially displaceable.
- a sealing surface is formed, which cooperates with a sealing seat which is formed on the nozzle body 2.
- the diameter of the sealing seat is given as d s .
- the nozzle needle 5 has three regions with different diameters d 1 , d 2 and d 3 .
- the diameter d 1 is slightly smaller than the diameter d 2 .
- the annular space 8 is also referred to as a pressure chamber.
- the diameter d 2 of the nozzle needle 5 corresponds in the present example, the diameter d 3 on the nozzle needle 5.
- the diameter d 2 is also referred to as a guide diameter.
- the diameter d 3 is also referred to as the control diameter.
- the outer diameter d 2 of the nozzle needle 5 is equal to the inner diameter d 3 of the recess 14 in the combustion chamber distal end of the nozzle needle 5.
- the diameter d 3 may also be smaller than the diameter d 2 .
- a flat 9 is formed in the guide section of the nozzle needle 5 with the diameter d 2 .
- the flattening 9 creates a connection between a nozzle spring chamber 10 and the pressure chamber 8.
- the nozzle spring chamber 10 is surrounded by the nozzle body 2 and the holding body 3.
- a fuel inlet 11 is formed, which opens into the nozzle spring chamber 10.
- a nozzle spring 12 is arranged in the nozzle spring chamber 10.
- the nozzle spring 12 is supported on the combustion chamber remote end face of the nozzle needle 5.
- In the center of the combustion chamber remote end face of the nozzle needle 5 is a cylindrical recess 14 which surrounds a control chamber 15.
- a sleeve 16 is guided on its outer circumferential surface.
- a collar 17 is formed, which forms an abutment for the prestressed nozzle spring 12.
- a biting edge 18 is formed on the combustion chamber remote end face of the sleeve 16, which is in contact with the holding body 3.
- the control chamber 15 is connected via an inlet throttle 19 with the Nozzle spring chamber 10 in conjunction.
- the stands Control chamber 15 via the interior of the sleeve 16 with a Fuel drain 20 in conjunction.
- the fuel drain 20 is an outlet throttle 21.
- the Fuel outlet 20 is through a control valve member 22nd locked. When the control valve member 22 from its seat takes off, the fuel outlet 20 with a (not shown) pressure relief space connected.
- Fig. 1 common rail injector works as follows: About the fuel inlet 11 comes with high pressure fuel from the Rail in the nozzle spring chamber 10. From there comes along with High-pressure fuel on the one hand on the Inlet throttle 19 in the control chamber 15 and on the other hand the flattening 9 over into the pressure chamber 8.
- the Diameter ratios are chosen in a known manner so that the nozzle needle 5 due to the high pressure in the Control chamber 15 with its tip 6 in contact with the Nozzle needle seat is located.
- the control valve member 22 opens, the control room 15 is relieved, and the Nozzle needle tip 6 lifts off its seat. Then it will be like this long high pressure fuel through the Spray hole 7 in the combustion chamber of the internal combustion engine injected until the control valve member 22 closes again. This then has the consequence that the pressure in the control room 15th rises and the nozzle needle 5 due to the biasing force the nozzle spring 12 with its tip 6 again against the associated nozzle needle seat is pressed.
- Fig. 2 corresponds largely to the example shown in FIG. For simplicity, be Designation of the same parts the same reference numerals used. In addition, to avoid repetition, to the above description of the first Reference example. The following is only up the differences between the two examples received.
- a Auxiliary control room 24 is formed.
- the auxiliary control room 24 is via an inlet throttle 25 with the nozzle spring chamber 10th in connection.
- the auxiliary control room 24 is over an auxiliary throttle 26 with the control chamber 15 in conjunction.
- the sleeve 16 in the closing movement of the nozzle needle 5 of lift off their seat on the holding body 3. The lifting of the Sleeve 16 from its seat is replaced by the auxiliary throttle 26th guaranteed.
- control valve member 22 is shown by way of example only. In the context of the present invention may as well force balanced solenoid valves or double switching Piezo actuator can be used.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Seats For Vehicles (AREA)
- Platform Screen Doors And Railroad Systems (AREA)
Description
- Fig. 1
- ein Beispiel eines nicht erfindungsgemäßen Injektors im Längsschnitt durch das Injektorgehäuse; und
- Fig. 2
- ein zweites Ausführungsbeispiel eines erfindungsgemäßen Injektors im Längsschnitt durch das Injektorgehäuse.
Claims (8)
- Common-Rail-Injektor zur Einspritzung von Kraftstoff in einem Common-Rail-Einspritzsystem einer Brennkraftmaschine, der ein Injektorgehäuse (1) mit einem Kraftstoffzulauf (11) aufweist, der mit einem zentralen Kraftstoffhochdruckspeicher außerhalb des Injektorgehäuses (1) und mit einem Druckraum innerhalb des Injektorgehäuses (1) in Verbindung steht, aus dem mit Hochdruck beaufschlagter Kraftstoff in Abhängigkeit von der Stellung eines Steuerventils (22) eingespritzt wird, das dafür sorgt, dass eine in einer Längsbohrung (4) des Injektors axial gegen die Vorspannkraft einer Düsenfeder (12), die in einem Düsenfederraum (10) aufgenommen ist, hin- und herbewegbare Düsennadel (5) von einem Sitz abhebt, wenn der Druck in den Druckraum (8) größer als der Druck in einem Steuerraum (15) ist, der über eine Zulaufdrossel (25) mit dem Kraftstoffzulauf (11) und über einen Kraftstoffablauf (20) mit einem Entlastungsraum verbunden ist, wobei der Steuerraum (15) in das brennraumferne Ende der Düsennadel (5) integriert ist, dadurch gekennzeichnet, dass an dem brennraumfernen Ende der Hülse (16) ein Hilfssteuerraum (24) ausgebildet ist, der über die Zulaufdrossel (25) mit dem Düsenfederraum (10) und über eine Hilfsdrossel (26) mit dem Steuerraum (15) in Verbindung steht, und dass der Kraftstoffablauf (20) in den Hilfssteuerraum (24) mündet.
- Common-Rail-Injektor nach Anspruch 1, dadurch gekennzeichnet, dass in dem brennraumfernen Ende der Düsennadel (5) eine im Wesentlichen zylinderförmige Ausnehmung (14) vorgesehen ist, in der ein äußerer Umfangsabschnitt einer Hülse (16) unter Dichtwirkung axial verschiebbar aufgenommen ist, deren brennraumferne Stirnfläche durch die Vorspannkraft der Düsenfeder (12) gegen das Injektorgehäuse (1) gedrückt wird, und deren Innenraum mit dem Kraftstoffablauf (20) in Verbindung steht.
- Common-Rail-Injektor nach Anspruch 2, dadurch gekennzeichnet, dass an dem brennraumfernen Ende (16) der Hülse ein Bund (17) ausgebildet ist, der ein Widerlager für die Düsenfeder (12) bildet, die gegen das brennraumferne Ende der Düsennadel (5) vorgespannt ist.
- Common-Rail-Injektor nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass an der brennraumfernen Stirnfläche der Hülse (16), die sich in Anlage an dem Injektorgehäuse (1) befindet, eine Beißkante (18) ausgebildet ist.
- Common-Rail-Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Kraftstoffzulauf (11) über den Düsenfederraum (10) mit dem Druckraum (8) in Verbindung steht, und dass die Düsennadel (5) zwischen dem Düsenfederraum (10) und dem Druckraum (8) geführt ist.
- Common-Rail-Injektor nach Anspruch 5, dadurch gekennzeichnet, dass an der Düsennadel (5) zwischen dem Düsenfederraum (10) und dem Druckraum (8) mindestens eine Abflachung (9) ausgebildet ist, an der vorbei Kraftstoff von dem Düsenfederraum (10) in den Druckraum (8) gelangen kann.
- Common-Rail-Injektor nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass die Zulaufdrossel (19; 25) in die Düsennadel (5) oder in die Hülse (16) integriert ist.
- Common-Rail-Injektor nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, dass der Düsennadelhub (H) durch den axialen Abstand zwischen der Düsennadel (5) und der Hülse (16) definiert ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19936669A DE19936669A1 (de) | 1999-08-04 | 1999-08-04 | Common-Rail-Injektor |
DE19936669 | 1999-08-04 | ||
PCT/DE2000/002532 WO2001011220A1 (de) | 1999-08-04 | 2000-08-01 | Common-rail-injektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1117922A1 EP1117922A1 (de) | 2001-07-25 |
EP1117922B1 true EP1117922B1 (de) | 2005-03-16 |
Family
ID=7917135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00962184A Expired - Lifetime EP1117922B1 (de) | 1999-08-04 | 2000-08-01 | Common-rail-injektor |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1117922B1 (de) |
JP (1) | JP2003506621A (de) |
KR (1) | KR20010075416A (de) |
AT (1) | ATE291169T1 (de) |
CZ (1) | CZ20011138A3 (de) |
DE (2) | DE19936669A1 (de) |
WO (1) | WO2001011220A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013225107A1 (de) | 2013-12-06 | 2015-06-11 | Robert Bosch Gmbh | Kraftstoffinjektor, insbesondere Common-Rail-Injektor für selbstzündende Brennkraftmaschinen |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10031573A1 (de) * | 2000-06-29 | 2002-01-17 | Bosch Gmbh Robert | Hochdruckfester Injektor zur Kraftstoffeinspritzung in Kompaktbauweise |
DE10036868B4 (de) * | 2000-07-28 | 2004-07-29 | Robert Bosch Gmbh | Injektor für ein einen Hochdrucksammelraum umfassendes Einspritzsystem |
DE10037571A1 (de) * | 2000-08-02 | 2002-02-14 | Bosch Gmbh Robert | Brennstoffeinspritzventil und Verfahren zu dessen Einstellung |
DE10100390A1 (de) * | 2001-01-05 | 2002-07-25 | Bosch Gmbh Robert | Einspritzventil |
DE10111783B4 (de) * | 2001-03-12 | 2005-10-20 | Bosch Gmbh Robert | Einspritzdüse |
DE10152268A1 (de) * | 2001-10-20 | 2003-04-30 | Bosch Gmbh Robert | Einspritzventil |
DE10155187B4 (de) * | 2001-11-12 | 2007-08-16 | L'orange Gmbh | Einspritzinjektor für Brennkraftmaschinen |
DE10250720A1 (de) * | 2002-10-31 | 2004-05-13 | Robert Bosch Gmbh | Einspritzventil |
DE102004018931A1 (de) * | 2004-04-20 | 2005-11-17 | Robert Bosch Gmbh | Common-Rail-Injektor |
JP4868524B2 (ja) * | 2007-04-09 | 2012-02-01 | ボッシュ株式会社 | 燃料噴射弁 |
JP7322820B2 (ja) * | 2020-06-10 | 2023-08-08 | 株式会社デンソー | 弁装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB862382A (en) * | 1959-04-01 | 1961-03-08 | Caterpillar Tractor Co | Sliding type fuel injection valve |
US4700891A (en) * | 1985-10-02 | 1987-10-20 | Robert Bosch Gmbh | Electromagnetically actuatable fuel injection valve |
EP0449763B1 (de) * | 1990-03-28 | 1994-10-12 | Stanadyne Automotive Corp. | Kraftstoffeinspritzdüse |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19724637A1 (de) | 1997-06-11 | 1998-12-17 | Bosch Gmbh Robert | Einspritzventil |
DE19744518A1 (de) * | 1997-10-09 | 1999-04-15 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19954023B4 (de) * | 1998-11-30 | 2009-02-26 | Denso Corp., Kariya-shi | Hochdruckkraftstoffeinspritzvorrichtung |
-
1999
- 1999-08-04 DE DE19936669A patent/DE19936669A1/de not_active Ceased
-
2000
- 2000-08-01 CZ CZ20011138A patent/CZ20011138A3/cs unknown
- 2000-08-01 AT AT00962184T patent/ATE291169T1/de not_active IP Right Cessation
- 2000-08-01 EP EP00962184A patent/EP1117922B1/de not_active Expired - Lifetime
- 2000-08-01 KR KR1020017003938A patent/KR20010075416A/ko not_active Application Discontinuation
- 2000-08-01 WO PCT/DE2000/002532 patent/WO2001011220A1/de not_active Application Discontinuation
- 2000-08-01 DE DE50009786T patent/DE50009786D1/de not_active Expired - Lifetime
- 2000-08-01 JP JP2001515446A patent/JP2003506621A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB862382A (en) * | 1959-04-01 | 1961-03-08 | Caterpillar Tractor Co | Sliding type fuel injection valve |
US4700891A (en) * | 1985-10-02 | 1987-10-20 | Robert Bosch Gmbh | Electromagnetically actuatable fuel injection valve |
EP0449763B1 (de) * | 1990-03-28 | 1994-10-12 | Stanadyne Automotive Corp. | Kraftstoffeinspritzdüse |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013225107A1 (de) | 2013-12-06 | 2015-06-11 | Robert Bosch Gmbh | Kraftstoffinjektor, insbesondere Common-Rail-Injektor für selbstzündende Brennkraftmaschinen |
Also Published As
Publication number | Publication date |
---|---|
ATE291169T1 (de) | 2005-04-15 |
EP1117922A1 (de) | 2001-07-25 |
WO2001011220A1 (de) | 2001-02-15 |
JP2003506621A (ja) | 2003-02-18 |
DE19936669A1 (de) | 2001-02-22 |
KR20010075416A (ko) | 2001-08-09 |
DE50009786D1 (en) | 2005-04-21 |
CZ20011138A3 (cs) | 2002-01-16 |
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