EP1163442A1 - Kraftstoff-einspritzdüse - Google Patents
Kraftstoff-einspritzdüseInfo
- Publication number
- EP1163442A1 EP1163442A1 EP01903592A EP01903592A EP1163442A1 EP 1163442 A1 EP1163442 A1 EP 1163442A1 EP 01903592 A EP01903592 A EP 01903592A EP 01903592 A EP01903592 A EP 01903592A EP 1163442 A1 EP1163442 A1 EP 1163442A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- sealing seat
- injection
- injection nozzle
- section
- 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 26
- 239000007924 injection Substances 0.000 title claims abstract description 26
- 239000000446 fuel Substances 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 26
- 239000007921 spray Substances 0.000 claims description 15
- 230000007704 transition Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects 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
- 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
-
- 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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
Definitions
- the invention relates to a fuel injector with a nozzle body which is provided with at least one spray hole and a conical contact surface, and a nozzle needle which is displaceable in the nozzle body and has an inlet surface and downstream of the inlet surface a radial shoulder, so that on Transition to the inlet surface, a sealing seat is formed, which can interact with the contact surface.
- Such a fuel injector is known from DE 195 47 423 A1.
- the radial shoulder which has a depth of the order of 0.01 to 0.06 mm, serves to produce a cross-section transition in the area of the sealing seat that is as sharp as possible, so that the flow cross-section that results when the nozzle needle is open is defined as precisely as possible .
- the areas of the nozzle needle adjoining the step downstream with a small opening stroke, such as is used for a pre-injection form a comparatively long flow channel, which acts as a throttle and in which the inevitable manufacturing tolerances have a large impact on the flow.
- a temperature-dependent laminar flow is formed in the gap geometry used, which additionally impairs the flow behavior.
- the object of the invention is to further develop an injection nozzle of the type mentioned at the outset such that reliable metering of the amount of fuel to be injected is possible even with the smallest opening strokes, as is necessary for a pre-injection.
- a fuel injection nozzle of the type mentioned which has the features of the characterizing part of claim 1, has the advantage that such a large flow cross-section is formed downstream of the sealing seat due to the circumferential groove that the resulting flow in the open state of the nozzle needle, such as it corresponds to a pre-injection, is determined exclusively by the cross-section in the area of the sealing seat. Since the radial shoulder is also very sharp-edged, manufacturing tolerances at this point have negligible effects on the flow cross-section that results when the nozzle needle is open.
- FIG. 1 shows a cross section through the front end of an injection nozzle
- FIG. 2 is a diagram of the opening cross section between the nozzle needle and the nozzle body as a function of the stroke of the nozzle needle.
- FIG. 1 shows the front section of an injection nozzle, that is, the section that connects a combustion chamber of a combustion force to be supplied.
- the injection nozzle has a nozzle body 10 which is provided with several spray holes 12 in the area of its front end. On the inside, the nozzle body 10 is provided with a conical contact surface 14 which has a cone angle of approximately 60 °
- a nozzle needle 16 Arranged inside the nozzle body 10 is a nozzle needle 16 which is adjustable between a closed position in which no fuel can flow from a fuel supply (not shown) to the spray holes 12 and an open position in which the injection of fuel is possible
- the opening stroke carried out by the nozzle needle 16 between the closed position and the open position can be controlled in such a way that the amount of fuel injected is adapted to the respective requirements.
- a small opening stroke is possible, so that only a small amount of fuel is injected for a pre-injection to achieve, as well as the actual opening stroke, which leads to the fact that a larger amount of fuel is injected so that a main combustion takes place
- the nozzle needle 16 has an inlet surface 18, which is formed as a conical surface in the embodiment shown.
- the outer contour of the inlet surface closes an angle ⁇ of approximately 22.5 ° with the central axis M of the injection nozzle, which could differ from the embodiment shown deviating values between 0 ° and 45 ° can also be selected for the angle ß
- the radial shoulder 20 is designed on its downstream side in such a way that a tangent to its contour (viewed again in section from FIG. 1) is parallel to the central axis M.
- the radial shoulder has a cylindrical surface at its downstream end, the central axis of which coincides with the central axis M of the nozzle needle.
- circumferential groove 24 which forms a flow gap towards the spray holes 12.
- the circumferential groove 24 extends exactly to the point where it enters the spray holes.
- the circumferential groove 24 extends to the center of the spray holes 12, and in the contour designated C in FIG. 1, the circumferential groove 24 extends completely over the spray holes.
- the extent of the circumferential groove 24 in the axial direction that is, for example, corresponding to one of the contours A, B or C, represents a compromise between the flow cross-section in the region of the circumferential groove, which should be as large as possible, and that with regard to the HC values of the supplied Combustion engine harmful volume, which is formed by the circumferential groove and should be as small as possible.
- the sealing seat 22 is lifted off the contact surface 14 If the sealing seat 22 connects the radial shoulder 20 and the circumferential groove 24, the narrowest flow cross-section is formed by the sealing seat 22, the flow cross-section downstream of the sealing seat 22 are all larger. Because of the sharp-edged geometry used for the sealing seat 22, the inevitable manufacturing tolerances have a comparative nature little impact on the resulting flow area
- FIG. 2 shows the resulting flow cross-section A as a function of the needle stroke s.
- Reference number 22 denotes the course of the flow cross-section that results from the sealing seat 22.
- Reference number 14 denotes the flow cross-section that results from the downstream of the sealing seat 22 ending areas of the nozzle needle and the contact surface,
- reference numeral 12 finally denotes the flow cross-section which is determined by the spray holes 12
- the nozzle needle only performs a small opening stroke V, as used for a pre-injection, the resulting flow cross-section is determined exclusively by the sealing seat 22. Only when a larger opening stroke is carried out does a flow cross-section first result, which is no longer from the sealing seat 22, but instead is determined by the contact surface 14 and the inlet to the spray holes. Subsequently, with an even greater opening stroke of the nozzle needle, there is an area in which the flow cross section is constant and is determined exclusively by the cross section of the spray holes 12. This area continues up to the maximum Opening stroke s max of the nozzle needle, which is of the order of magnitude of 0.2 to 0.3 mm. However, the geometry of the nozzle needle according to the invention is of no influence for the latter two areas, since it only affects opening openings as are used for the pre-injection
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 |
---|---|---|---|
DE10000574 | 2000-01-10 | ||
DE10000574A DE10000574A1 (de) | 2000-01-10 | 2000-01-10 | Kraftstoff-Einspritzdüse |
PCT/DE2001/000016 WO2001051806A1 (de) | 2000-01-10 | 2001-01-05 | Kraftstoff-einspritzdüse |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1163442A1 true EP1163442A1 (de) | 2001-12-19 |
EP1163442B1 EP1163442B1 (de) | 2005-07-06 |
Family
ID=7627024
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01903592A Expired - Lifetime EP1163442B1 (de) | 2000-01-10 | 2001-01-05 | Kraftstoff-einspritzdüse |
Country Status (9)
Country | Link |
---|---|
US (1) | US20030057299A1 (de) |
EP (1) | EP1163442B1 (de) |
JP (1) | JP2003519758A (de) |
KR (1) | KR20010102515A (de) |
CN (1) | CN1188591C (de) |
BR (1) | BR0103895A (de) |
DE (2) | DE10000574A1 (de) |
PL (1) | PL349996A1 (de) |
WO (1) | WO2001051806A1 (de) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10245573A1 (de) | 2002-09-27 | 2004-04-08 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE10246693A1 (de) * | 2002-10-07 | 2004-04-15 | Siemens Ag | Einspritzvorrichtung zum Einspritzen von Kraftstoff |
KR20040038080A (ko) * | 2002-10-31 | 2004-05-08 | 현대자동차주식회사 | 커먼레일 엔진용 인젝터 |
DE10251014A1 (de) * | 2002-11-02 | 2004-05-19 | Robert Bosch Gmbh | Kraftstoffzumesseinheit für Kraftstoffeinspritzanlagen von Brennkraftmaschinen |
DE10305303A1 (de) * | 2003-02-10 | 2004-08-19 | Robert Bosch Gmbh | Kraftstoff-Einspritzvorrichtung, insbesondere für Brennkraftmaschinen mit Kraftstoff-Direkteinspritzung |
DE102005025135A1 (de) * | 2005-06-01 | 2006-12-07 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
US7360722B2 (en) * | 2005-08-25 | 2008-04-22 | Caterpillar Inc. | Fuel injector with grooved check member |
US7578450B2 (en) * | 2005-08-25 | 2009-08-25 | Caterpillar Inc. | Fuel injector with grooved check member |
US20070200011A1 (en) * | 2006-02-28 | 2007-08-30 | Caterpillar Inc. | Fuel injector having nozzle member with annular groove |
GB0625770D0 (en) * | 2006-12-22 | 2007-02-07 | Delphi Tech Inc | Fuel injector for an internal combustion engine |
DE102009042155A1 (de) * | 2009-09-21 | 2011-04-07 | Continental Automotive Gmbh | Kraftstoff-Einspritzventil für eine Brennkraftmaschine |
EP2439447A1 (de) * | 2010-10-05 | 2012-04-11 | Siemens Aktiengesellschaft | Brennstoffdüse, Gasturbinenbrennkammer und Brenner mit einer solchen Brennstoffdüse |
WO2012085901A2 (en) | 2011-05-09 | 2012-06-28 | Lietuvietis Vilis I | Valve covered orifice pressure equalizing channel |
DE102012218016A1 (de) * | 2012-10-02 | 2014-04-03 | Continental Automotive Gmbh | Düsenbaugruppe für ein Einspritzventil und Einspritzventil |
CN103277225A (zh) * | 2013-06-07 | 2013-09-04 | 苏州柏德纳科技有限公司 | 一种喷油嘴 |
CN103742778B (zh) * | 2014-01-09 | 2016-08-24 | 四川宁江山川机械有限责任公司 | 一种注油机注油嘴的改进结构 |
JP6354519B2 (ja) * | 2014-10-23 | 2018-07-11 | 株式会社デンソー | 燃料噴射弁 |
CN104612875A (zh) * | 2014-12-02 | 2015-05-13 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | 一种新型大流量共轨喷油器喷油嘴偶件 |
DE102016215637A1 (de) * | 2016-08-19 | 2018-02-22 | Robert Bosch Gmbh | Kraftstoffeinspritzdüse |
CN106762303B (zh) * | 2016-12-15 | 2019-08-27 | 江苏大学 | 一种控制商用车用柴油机小油量时喷射稳定性用孔式喷油嘴 |
DE102019210551A1 (de) * | 2019-07-17 | 2021-01-21 | Robert Bosch Gmbh | Kraftstoffinjektor |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54901Y2 (de) * | 1975-05-22 | 1979-01-17 | ||
DE2710217A1 (de) * | 1977-03-09 | 1978-09-14 | Bosch Gmbh Robert | Kraftstoffeinspritzduese |
JP2765178B2 (ja) * | 1990-04-11 | 1998-06-11 | 株式会社デンソー | 燃料噴射ノズル |
JP2841768B2 (ja) * | 1990-07-23 | 1998-12-24 | 日産自動車株式会社 | ディーゼル機関用燃料噴射ノズル |
JP2841770B2 (ja) * | 1990-07-26 | 1998-12-24 | 日産自動車株式会社 | ディーゼル機関用燃料噴射ノズル |
JPH04318277A (ja) * | 1991-04-17 | 1992-11-09 | Nissan Motor Co Ltd | 燃料噴射ノズル |
JPH0583369U (ja) * | 1992-04-20 | 1993-11-12 | 日産ディーゼル工業株式会社 | 燃料噴射ノズル |
GB9425652D0 (en) * | 1994-12-20 | 1995-02-22 | Lucas Ind Plc | Fuel injection nozzle |
DE19547423B4 (de) | 1995-12-19 | 2008-09-18 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
JPH10196492A (ja) * | 1997-01-13 | 1998-07-28 | Isuzu Motors Ltd | ディーゼルエンジン |
DE19820513A1 (de) * | 1998-05-08 | 1999-11-11 | Mtu Friedrichshafen Gmbh | Kraftstoffeinspritzdüse für eine Brennkraftmaschine |
-
2000
- 2000-01-10 DE DE10000574A patent/DE10000574A1/de not_active Withdrawn
-
2001
- 2001-01-05 WO PCT/DE2001/000016 patent/WO2001051806A1/de not_active Application Discontinuation
- 2001-01-05 JP JP2001551985A patent/JP2003519758A/ja active Pending
- 2001-01-05 CN CNB018000479A patent/CN1188591C/zh not_active Expired - Fee Related
- 2001-01-05 PL PL01349996A patent/PL349996A1/xx unknown
- 2001-01-05 EP EP01903592A patent/EP1163442B1/de not_active Expired - Lifetime
- 2001-01-05 DE DE50106669T patent/DE50106669D1/de not_active Expired - Lifetime
- 2001-01-05 US US09/936,217 patent/US20030057299A1/en not_active Abandoned
- 2001-01-05 BR BR0103895-8A patent/BR0103895A/pt active Search and Examination
- 2001-01-05 KR KR1020017011329A patent/KR20010102515A/ko not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0151806A1 * |
Also Published As
Publication number | Publication date |
---|---|
PL349996A1 (en) | 2002-10-21 |
DE50106669D1 (de) | 2005-08-11 |
DE10000574A1 (de) | 2001-07-19 |
CN1188591C (zh) | 2005-02-09 |
EP1163442B1 (de) | 2005-07-06 |
WO2001051806A1 (de) | 2001-07-19 |
KR20010102515A (ko) | 2001-11-15 |
BR0103895A (pt) | 2001-12-18 |
CN1358256A (zh) | 2002-07-10 |
JP2003519758A (ja) | 2003-06-24 |
US20030057299A1 (en) | 2003-03-27 |
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