WO2003016708A1 - Kraftstoffeinspritzventil für brennkraftmaschinen und ein verfahren zur härtung desselben - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinen und ein verfahren zur härtung desselben Download PDFInfo
- Publication number
- WO2003016708A1 WO2003016708A1 PCT/DE2002/002239 DE0202239W WO03016708A1 WO 2003016708 A1 WO2003016708 A1 WO 2003016708A1 DE 0202239 W DE0202239 W DE 0202239W WO 03016708 A1 WO03016708 A1 WO 03016708A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- valve body
- fuel injection
- internal combustion
- steel
- Prior art date
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
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
-
- 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
- F02M61/166—Selection of particular materials
-
- 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
- F02M2200/90—Selection of particular materials
- F02M2200/9053—Metals
- F02M2200/9061—Special treatments for modifying the properties of metals used for fuel injection apparatus, e.g. modifying mechanical or electromagnetic properties
Definitions
- the temperature load on the fuel injection valves and thus on the needle seat in the valve body will continue to increase due to an increase in performance or an increase in braking power, particularly in commercial vehicles.
- the case-hardened steels previously used and the hardening methods used for them are no longer sufficient for these applications.
- the fuel injection valve according to the invention for internal combustion engines according to the preamble of claim 1 has the advantage that the valve body is dimensionally and wear-resistant up to high temperatures and is therefore suitable for use at all operating points of an internal combustion engine.
- the valve body of the fuel injector consists of a high-alloy hot-work steel that has been hardened by a carburizing process. By combining the high-alloy hot-work steel with a suitable carburizing process, the advantages of material and hardening process add up positively.
- a significant increase in the fatigue strength of the high-alloy steel is obtained through a reduced notch effect during use, a reduction in stock removal during the subsequent grinding work on the functional geometries and a reduction in the necessary initial hardness of the valve body and thus improved machinability and a reduction in the cavitation sensitivity in the valve body, in particular in the area of the valve seat.
- the hot-work steel is dimensionally and wear-resistant up to a temperature of 450 ° C.
- the fuel injection valve is suitable for use at all possible operating points of the internal combustion engine.
- the high-alloy hot-work steel consists at least approximately of 0.4% carbon, 5% chromium, 1% molybdenum and other metallic and non-metallic elements in traces of less than 1% overall, the 100% missing iron is.
- Such steels, such as X 40 CrMo V 51, are commercially available and can be used without further effort.
- the carburizing process is a gas carburizing process. Carburizing eliminates the need for time-consuming post-processing.
- the method according to the invention for hardening a valve body which is part of a fuel injection valve for internal combustion engines, has the advantage that the treatment has the necessary heat resistance for use in the combustion chamber of an internal combustion engine.
- the valve body is carburized in a gas atmosphere that contains a hydrocarbon and then heat-treated at a temperature of about 900 ° C. in vacuo, but at most at a pressure of 100 Pa.
- the carburizing will take place at a pressure of less than 100 kPa.
- This vacuum carburizing process in particular results in a reduction in the formation of edge oxidations which reduce the strength.
- a fuel injection valve is shown in longitudinal section as an example of a hardened valve body.
- the fuel injection valve shown in FIG. 1 has a valve body 1, in which a valve needle 5 is arranged to be longitudinally displaceable in a bore 3.
- a valve needle 5 is arranged to be longitudinally displaceable in a bore 3.
- an essentially conical valve seat 9 is formed, in which at least one injection opening 11 is formed, which connects the bore 3 with the combustion chamber of the internal combustion engine.
- the valve needle 5 has a guide section 15 with which it is sealingly guided in a leading section 23 of the bore 3. In the direction of the valve seat 9, the valve needle 5 tapers to form a pressure shoulder 13 and merges into a shaft section 17 with a reduced diameter.
- an essentially conical valve sealing surface 7 is formed on the valve needle 5, which cooperates with the valve seat 9 and thus closes the at least one injection opening 11 with respect to the bore 3 when it contacts the valve seat 9.
- a radial expansion of the bore 3 forms a pressure chamber 19 which can be filled with fuel under high pressure via an inlet channel 25.
- the pressure chamber 19 continues to the valve seat 9 as an annular channel 21 which surrounds the shaft section 17 of the valve needle 3. In this way, the fuel flows from the inlet channel 25 through the pressure chamber 19 and the annular channel 21 to the valve seat 9 and, if the valve sealing surface 7 is lifted off the valve seat 9, through the injection openings 11 into the combustion chamber of the internal combustion engine.
- the valve needle 5 is controlled by the ratio of the hydraulic forces on the pressure shoulder 13 and the valve sealing surface 7 on the one hand and a closing force on the other hand, which acts on the end of the valve needle 5 facing away from the combustion chamber and acts on the valve needle 5 in the direction of the valve seat 9.
- One possible operating state of the fuel injection valve is that the closing force on the valve needle 5 remains constant, while the fuel pressure in the pressure chamber 19 and in the annular channel 21 changes due to fuel being supplied from the inlet channel 25. Due to the fuel pressure in the pressure chamber 19 and in the region of the valve seat 9, the valve needle 5 experiences a hydraulic force which is directed away from the valve seat 9.
- this hydraulic force is greater than the closing force on the valve needle 5, it moves away from the valve seat 9 and thus lifts off from the valve seat 9 with the valve sealing surface 7. If the pressure in the pressure chamber 19 falls below a certain threshold pressure, the closing force on the valve needle 5 predominates and it moves again in the direction of the valve seat 9 until the valve sealing surface 7 closes the at least one injection opening 11 again.
- valve needle 5 The longitudinal movement of the valve needle 5 and the relatively hard placement of the valve needle 5 on the valve seat 9 result in high forces on the valve body 1 in the region of the valve 9.
- longitudinal movement of the valve needle 5 in the leading section 23 of the bore 3 results in friction losses between the valve needle 5 and the wall of the bore 3, which can lead to an impermissibly high wear with a soft material of the valve body 1.
- a so-called hot working steel which belongs to the tool steels, is used for the valve body 1.
- high-alloy hot-work steels such as X 40 steel, has proven to be particularly advantageous CrMoV 51.
- This high-alloy hot-work steel can be exposed to working temperatures of up to 450 ° C without losing hardness and therefore wear resistance.
- the surface of the valve body 1 must be additionally hardened.
- carbon is introduced into the layers of the valve body 1 near the surface in a so-called carburizing process, as a result of which the surface becomes hardenable.
- a possible carburizing process is the gas carburizing process, in which the steel is exposed to an atmosphere of hydrocarbons and chemically inert gases, such as nitrogen (2), at a temperature of 900 ° C. to 1000 ° C. The carbon diffuses into the layers of the valve body 1 near the surface, so that the carbon content increases there.
- the hardening depths are 0.3 to 4 mm.
- the carburizing makes the material hardenable, which is carried out by subsequent heating in a vacuum furnace.
- the workpiece in this case the valve body 1, is heated to approximately 800 ° C., the vacuum largely prevailing in the hardening furnace, in any case a pressure of less than 100 Pa.
- the advantage of this hardening method of the valve body 1 consists in the combination of a high-alloy hot-work steel with a gas carburizing method that works with negative pressure, that is to say at a pressure of less than 100 kPa. This adds the advantages of hot-work steel to those of the carburizing and hardening process. A significant increase in the fatigue strength of the high-alloy steel is achieved through a reduced notch effect when using the vacuum carburizing process, since edge oxidation is avoided. At the same time, there is a reduction in the stock removal during the subsequent grinding on the functional geometries, since the injection opening 11 is reworked by hydroerosive grinding. Another advantage is the reduction in the necessary initial hardness of the fuel injection valve and thus an improved machinability after the heat treatment of the valve body 1. A reduction in the cavitation sensitivity of the surfaces is also obtained, especially in the inlet bore and needle seat area of the valve body 1.
- high-alloy hot-work steel X 40 CrMoV 51 In addition to the high-alloy hot-work steel X 40 CrMoV 51, other high-alloy hot-work steels with a carbon content of 0.3 to 0.5% can also be used.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003520977A JP2004538423A (ja) | 2001-08-11 | 2002-06-19 | 内燃機関用の燃料噴射弁及び該燃料噴射弁の焼入れ法 |
BRPI0205866-9A BR0205866B1 (pt) | 2001-08-11 | 2002-06-19 | válvula de injeção de combustìvel para máquinas de combustão interna e um processo para o endurecimento da mesma. |
EP02748600A EP1419314B1 (de) | 2001-08-11 | 2002-06-19 | Kraftstoffeinspritzventil für brennkraftmaschinen und ein verfahren zur herstellung desselben |
DE50210282T DE50210282D1 (de) | 2001-08-11 | 2002-06-19 | Kraftstoffeinspritzventil für brennkraftmaschinen und ein verfahren zur herstellung desselben |
US10/398,899 US7419553B2 (en) | 2001-08-11 | 2002-06-19 | Fuel injection valve for internal combustion engines and a method for hardening the said valve |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10139620.1 | 2001-08-11 | ||
DE10139620A DE10139620A1 (de) | 2001-08-11 | 2001-08-11 | Kraftstoffeinspritzventil für Brennkraftmaschinen und ein Verfahren zur Härtung desselben |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003016708A1 true WO2003016708A1 (de) | 2003-02-27 |
Family
ID=7695228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/002239 WO2003016708A1 (de) | 2001-08-11 | 2002-06-19 | Kraftstoffeinspritzventil für brennkraftmaschinen und ein verfahren zur härtung desselben |
Country Status (7)
Country | Link |
---|---|
US (1) | US7419553B2 (de) |
EP (1) | EP1419314B1 (de) |
JP (1) | JP2004538423A (de) |
CN (1) | CN100365268C (de) |
BR (1) | BR0205866B1 (de) |
DE (2) | DE10139620A1 (de) |
WO (1) | WO2003016708A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006018348A1 (de) * | 2004-08-18 | 2006-02-23 | Robert Bosch Gmbh | Verfahren zur herstellung eines temperatur- und korrosionsbeständigen kraftstoffinjektorkörpers |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0602742D0 (en) * | 2005-06-06 | 2006-03-22 | Delphi Tech Inc | Machining method |
JP4948295B2 (ja) * | 2007-07-06 | 2012-06-06 | 愛三工業株式会社 | 燃料噴射弁 |
DE102012221607A1 (de) * | 2012-11-27 | 2014-05-28 | Robert Bosch Gmbh | Metallischer Werkstoff |
US20160348629A1 (en) * | 2015-05-29 | 2016-12-01 | Cummins Inc. | Fuel injector |
DE102016203261A1 (de) * | 2016-02-29 | 2017-08-31 | Robert Bosch Gmbh | Verfahren zum Herstellen einer Bohrung, Bauteil und Kraftstoffinjektor |
CN112222764B (zh) * | 2020-08-31 | 2021-09-28 | 中国航发南方工业有限公司 | 燃油喷嘴的加工方法、燃油喷嘴 |
KR102526865B1 (ko) * | 2023-02-15 | 2023-04-28 | (주)하트만 | 디젤 엔진용 연료분사노즐의 제조 방법 |
KR102526867B1 (ko) * | 2023-02-15 | 2023-04-28 | (주)하트만 | 디젤 엔진용 연료분사노즐의 제조 방법 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4201600A (en) * | 1977-09-22 | 1980-05-06 | Ipsen Industries International Gmbh | Method for the gas carburization of workpieces made of steel |
JPS6217364A (ja) * | 1985-07-13 | 1987-01-26 | Niigata Eng Co Ltd | 内燃機関の燃料噴射ノズル |
DE3536452A1 (de) * | 1985-08-10 | 1987-02-19 | Bosch Gmbh Robert | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
US4836864A (en) | 1983-12-27 | 1989-06-06 | Chugai Ro Co., Ltd. | Method of gas carburizing and hardening |
EP0512254A2 (de) * | 1991-05-08 | 1992-11-11 | Degussa Ag | Verfahren zur gleichmässigen thermochemischen Behandlung von Bauteilen aus Stahl, die schwer zugängliche Flächen aufweisen |
DE19618650A1 (de) | 1996-05-09 | 1997-11-13 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
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US3385739A (en) * | 1965-04-13 | 1968-05-28 | Eaton Yale & Towne | Alloy steel articles and the method of making |
US3567528A (en) * | 1968-02-09 | 1971-03-02 | Allegheny Ludlum Steel | Method of using a carburized austenitic stainless steel |
DE2451536A1 (de) * | 1974-10-30 | 1976-05-06 | Bosch Gmbh Robert | Verfahren zum aufkohlen von werkstuecken aus stahl |
JPS54125148A (en) * | 1978-03-23 | 1979-09-28 | Kawasaki Heavy Ind Ltd | Welded structure of hardened steel |
DE2851983B2 (de) | 1978-12-01 | 1980-11-06 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt | Verfahren zum Aufkohlen von Hohlkörpern, insbesondere von Düsen |
US4334552A (en) | 1980-04-11 | 1982-06-15 | Hr Textron Inc. | Diverter valve |
US5199659A (en) * | 1991-04-22 | 1993-04-06 | Shell Offshore Inc. | Seismic cable retrieval apparatus and method |
GB9203658D0 (en) * | 1992-02-19 | 1992-04-08 | Lucas Ind Plc | Fuel injection nozzles |
US5447800A (en) | 1993-09-27 | 1995-09-05 | Crucible Materials Corporation | Martensitic hot work tool steel die block article and method of manufacture |
CN1145714C (zh) * | 1995-03-29 | 2004-04-14 | 株式会社日本H | 真空渗碳方法、设备及渗碳制品 |
US6053722A (en) | 1998-07-28 | 2000-04-25 | Consolidated Process Machinery, Inc. | Nitrided H13-alloy cylindrical pelleting dies |
EP0982493B1 (de) | 1998-08-27 | 2003-09-24 | Wärtsilä Schweiz AG | Verfahren zum Herstellen einer Brennstoffeinspritzdüse und Brennstoffeinspritzdüse |
JP3630076B2 (ja) * | 2000-05-30 | 2005-03-16 | 株式会社デンソー | 弁装置 |
-
2001
- 2001-08-11 DE DE10139620A patent/DE10139620A1/de not_active Ceased
-
2002
- 2002-06-19 DE DE50210282T patent/DE50210282D1/de not_active Expired - Lifetime
- 2002-06-19 WO PCT/DE2002/002239 patent/WO2003016708A1/de active IP Right Grant
- 2002-06-19 BR BRPI0205866-9A patent/BR0205866B1/pt not_active IP Right Cessation
- 2002-06-19 JP JP2003520977A patent/JP2004538423A/ja active Pending
- 2002-06-19 CN CNB028026500A patent/CN100365268C/zh not_active Expired - Lifetime
- 2002-06-19 EP EP02748600A patent/EP1419314B1/de not_active Expired - Lifetime
- 2002-06-19 US US10/398,899 patent/US7419553B2/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4201600A (en) * | 1977-09-22 | 1980-05-06 | Ipsen Industries International Gmbh | Method for the gas carburization of workpieces made of steel |
US4836864A (en) | 1983-12-27 | 1989-06-06 | Chugai Ro Co., Ltd. | Method of gas carburizing and hardening |
JPS6217364A (ja) * | 1985-07-13 | 1987-01-26 | Niigata Eng Co Ltd | 内燃機関の燃料噴射ノズル |
DE3536452A1 (de) * | 1985-08-10 | 1987-02-19 | Bosch Gmbh Robert | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
EP0512254A2 (de) * | 1991-05-08 | 1992-11-11 | Degussa Ag | Verfahren zur gleichmässigen thermochemischen Behandlung von Bauteilen aus Stahl, die schwer zugängliche Flächen aufweisen |
DE19618650A1 (de) | 1996-05-09 | 1997-11-13 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 011, no. 191 (M - 600) 19 June 1987 (1987-06-19) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006018348A1 (de) * | 2004-08-18 | 2006-02-23 | Robert Bosch Gmbh | Verfahren zur herstellung eines temperatur- und korrosionsbeständigen kraftstoffinjektorkörpers |
Also Published As
Publication number | Publication date |
---|---|
CN1464942A (zh) | 2003-12-31 |
US20040050456A1 (en) | 2004-03-18 |
DE50210282D1 (de) | 2007-07-19 |
CN100365268C (zh) | 2008-01-30 |
EP1419314B1 (de) | 2007-06-06 |
DE10139620A1 (de) | 2003-02-27 |
EP1419314A1 (de) | 2004-05-19 |
BR0205866A (pt) | 2003-10-21 |
BR0205866B1 (pt) | 2011-02-08 |
JP2004538423A (ja) | 2004-12-24 |
US7419553B2 (en) | 2008-09-02 |
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