WO2005028853A1 - 内燃機関用燃料噴射弁 - Google Patents
内燃機関用燃料噴射弁 Download PDFInfo
- Publication number
- WO2005028853A1 WO2005028853A1 PCT/JP2004/013295 JP2004013295W WO2005028853A1 WO 2005028853 A1 WO2005028853 A1 WO 2005028853A1 JP 2004013295 W JP2004013295 W JP 2004013295W WO 2005028853 A1 WO2005028853 A1 WO 2005028853A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nozzle
- fuel injection
- injection valve
- fuel
- guide hole
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/07—Fuel-injection apparatus having means for avoiding sticking of valve or armature, e.g. preventing hydraulic or magnetic sticking of parts
Definitions
- the present invention relates to a fuel injection valve for directly injecting and supplying fuel into a cylinder of an internal combustion engine.
- a fuel injection valve for directly injecting and supplying fuel into a cylinder of an internal combustion engine
- a fuel injection valve of the type disclosed in Japanese Patent Application Laid-Open No. 7-310621 is known.
- the fuel injection valve opens the energized solenoid valve by energizing it to open the control chamber in the fuel injection valve body to the low-pressure section, thereby removing the back pressure of the valve piston and lifting the nozzle needle to reduce the fuel.
- Injection is started, and after a lapse of a predetermined time, the solenoid valve is de-energized to release the communication between the control chamber and the low-pressure section. , Thereby terminating the fuel injection.
- wax is mixed in the fuel so that the above-described smooth operation of the fuel injection valve can be ensured even in a low temperature state. Therefore, depending on the operating conditions of the engine, for example, starting in a low-temperature atmosphere of ⁇ 20 ° C or less, wax mixed in the fuel may precipitate at various parts of the fuel injection valve, causing various problems. Has the problem of causing it. In particular, when wax force precipitates in the fuel leakage path for allowing fuel to escape from the high pressure side to the low pressure side, the passage of fuel becomes impossible there, and the operation of the fuel injection valve, especially the operation of the nozzle needle, becomes unstable. Has a tendency. As a result, there is a problem that a failure such as an unstable fuel injection operation of the fuel injection valve is caused.
- An object of the present invention is to provide a fuel injection valve for an internal combustion engine that can solve the above-mentioned problems in the related art. It is another object of the present invention to provide a fuel injection valve for an internal combustion engine that can quickly discharge solidified matter even if it occurs in fuel. Disclosure of the invention
- a taper is provided on the nozzle 21 and / or the inner bore of the nozzle, whereby even if the components contained in the fuel are solidified, The solidified material is quickly discharged from a gap formed between the nozzle 21 and the guide hole and serving as a fuel leakage passage.
- a nozzle configured such that the nozzle needle passed through the guide hole in the nozzle body is guided by the inner hole and moves in the axial direction, thereby opening and closing the injection hole.
- a fuel injection valve for an internal combustion engine fixed to a tip end portion of a nozzle holder at least a part of a gap formed between the nozzle needle and the guide hole expands toward the nozzle holder.
- a fuel injection valve for an internal combustion engine characterized by the following is proposed.
- the taper angle of the tapered portion can be appropriately determined.
- the nozzle needle is supported and guided by the guide hole so as to be movable in the guide hole in the axial direction.
- the gap between the nozzle needle and the guide hole is extremely small, and the high-pressure fuel at the high-pressure portion at the tip of the nozzle needle leaks slightly to the low-pressure portion on the nozzle holder side through the gap.
- At least a part of the gap is tapered, and the gap has a portion that extends in a scar shape from the high-pressure portion to the low-pressure fuel portion. As a result, the width of the gap becomes larger as it is closer to the low pressure portion.
- FIG. 1 is a sectional view showing one embodiment of a fuel injection valve for an internal combustion engine according to the present invention.
- FIG. 2 is an enlarged cross-sectional view of a main part of FIG.
- FIG. 3 is an enlarged sectional view of a main part of a modification of the fuel injection valve for an internal combustion engine shown in FIG.
- FIG. 4 is an enlarged sectional view of a main part of a modified example of the nozzle shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a sectional view showing an example of an embodiment of a fuel injection valve according to the present invention.
- Reference numeral 1 denotes a fuel injection valve for an internal combustion engine used in a common rail system for injecting and supplying fuel to a diesel internal combustion engine.
- the fuel injection valve 1 is mounted on a cylinder of a diesel internal combustion engine (not shown), and directly injects a required amount of high-pressure fuel supplied from a common rail (not shown) into the cylinder at a required timing.
- a nozzle 3 is fixed to a tip of the nozzle holder 2 by a riving nut 4, and a solenoid valve 5 is provided at a rear end of the nozzle holder 2.
- the nozzle holder 2 has a hollow body 22 in which a guide hole 21 is formed in the axial direction.
- a pressure pin 23 in the guide hole 21 is movable in the axial direction by the guide hole 21. It is the structure arranged in.
- An elastic spring 25 is housed in the spring chamber 24 of the hollow body 22, and the elastic spring 25 urges a nozzle 21 3 described later toward the injection hole 35. It is being rushed.
- Reference numeral 26 denotes a passage provided in the hollow body 22 for supplying high-pressure fuel from a common rail (not shown) to the nozzle 3.
- the nozzle 3 has a nozzle body 31 and a nozzle needle 32, and a guide hole 33 coaxially formed in the nozzle body 31 allows the nozzle needle 32 to move in its axial direction. Supported and guided.
- the tip 3 2 A of the nozzle needle 32 extends into the cylinder 34 provided in the nozzle body 31 in alignment with the guide hole 33, and the tip of the nozzle needle 32 is jetted. It is configured to move as a valve that opens and closes hole 35. Therefore, when the nozzle needle 32 is held at the position where the injection hole 35 is closed, no fuel is injected from the fuel injection valve 1. On the other hand, when the nozzle needle 32 is retracted and the nozzle needle 32 is held at the position where the injection hole 35 is opened, fuel is injected from the fuel injection valve 1.
- an oil sump 37 for retaining high-pressure fuel introduced from the passage 26 through the passage 36 is formed.
- a taper portion 38 is formed in the nozzle 21 3 to apply a force in a direction to separate the nozzle needle 32 from the injection hole 35 by the pressure of the high-pressure fuel in the oil sump 37. Have been.
- a head 42 forming a drain chamber 41 extending downward in the axial direction of the hollow body 22 coaxially with the guide hole 21.
- a control chamber 45 communicating with the radial supply path 43 and the axial drain path 44 is formed at 42.
- the supply conduit 43 communicates with the intake tool 47 via a radial conduit 46 in the hollow body 22.
- the bottom of the control chamber 45 is formed by the upper surface of the pressure pin 23. I have.
- a ball 52 serving as a valve body is fixed to the armature 51 of the solenoid valve 5.
- the armature 51 is pushed down in the direction of the nozzle 3 by the force of a valve spring (not shown), whereby the ball 52 is pressed against the open end of the drain conduction path 44 and closes the drain conduction path 44. It is configured to be able to.
- the solenoid valve 5 when the solenoid valve 5 is energized, the armature 51 moves in a direction away from the head 42 by staking the force of the valve spring, so that the ball 52 is opened in the drain conduction path 44. After separating from the end, the drain conduction path 44 is in communication with the drain chamber 41.
- the gap G between the nozzle 21 and the guide hole 33 of the nozzle body 31 is a very small gap so as to be substantially oil-tight.
- the fuel pressure retained in the sump 37 is extremely high, and this high-pressure fuel slightly leaks through the gap G to the low-pressure side of the nozzle holder 2. If a wax component is mixed in the fuel, the wax component precipitates and solidifies in the gap G, particularly during low-temperature operation, and the fuel injector 1 tends to malfunction.
- FIG. 2 is an enlarged view of a main part of FIG. As shown in FIG. 2, in the fuel injection valve 1, a gap formed between the nozzle needle 32 and the guide hole 33 in order to prevent the above-described malfunction from occurring. At least a part of G has a tapered shape that extends toward the nozzle holder 2.
- the gap G is formed so as to have the tapered portion 33 B extending from the one end 33 A of the guide hole 33 and the oil sump 37 side toward the nozzle holder 2 so that the gap G is formed. It has a tapered shape expanding toward. As a result, the width W of the gap G is extremely narrow at the one end 33 A and linearly increases toward the other end 33 C. That is, the gap G expands in a scar-like manner from the high fuel pressure portion to the low fuel pressure portion.
- the guide hole 33 is configured as described above, the width W of the gap G near one end 33 A of the guide hole 33 is small, so that required oil tightness can be maintained. Since the gap G expands in a skirt shape from the high-pressure portion to the low-pressure portion of the fuel, for example, wax components in the fuel slightly leaked from the oil sump 37 to the guide holes 33 precipitate during low-temperature operation. However, when solidified, the solidified material is easily moved in the direction of the other end 33 C of the gap G (in the direction of the nozzle holder 2) and discharged to the low-pressure portion of the nozzle holder 2.
- the solidified wax component stays in the gap G, There is no problem that the smooth operation of the holder 2 is hindered and the fuel injection operation becomes unstable. As a result, when the fuel injector is operated using wax-containing fuel, stable operation can be expected even at low temperatures.
- FIG. 3 is a view for explaining a modified example of the tapered portion of the guide hole 33.
- the taper portion 33B is provided over the entire guide hole 33, but in the example shown in FIG. 3, the tapered portion 33B is formed in a part of the guide hole 33. Is provided.
- at least a part of the gap G has a tapered shape expanding toward the nozzle holder 2. That is, in the vicinity of one end 33 A of the guide hole 33, the width of the gap G? ⁇ A non-tapered portion 3 3D that is constant and narrowed, and a tape corresponding to the tapered portion 33 B only between the non-tapered portion 33 D and the other end 33 C. Part 3 3 E is provided.
- the provision of the non-tapered portion 3 3D has a higher oil-tightness between the guide hole 33 and the nozzle needle 32 in addition to the advantage of the configuration of FIG. Is obtained.
- the taper shape of the taper portions 33 B and 33 E is not limited to a linear shape, but may be any shape such as a curved shape or a mixed shape of a straight shape and a curved shape. It can be tapered.
- FIG. 4 is an enlarged sectional view of a main part of the nozzle 3 for explaining another modification of the gap G shown in FIG.
- a nozzle needle 32 instead of attaching a taper to the guide hole 33, a nozzle needle 32 is provided with a taper portion 32B, so that the nozzle needle 32 and the guide hole 33 are provided. Is formed in a tapered shape that expands toward the nozzle holder 2.
- the fuel injection valve for an internal combustion engine when operating a fuel injection valve for an internal combustion engine using a fuel mixed with a different component, the fuel injection valve for an internal combustion engine can ensure the stability of the operation regardless of operating conditions Help improve.
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
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04772977A EP1666720B1 (en) | 2003-09-19 | 2004-09-07 | Fuel injection valve for internal combustion engine |
US10/572,550 US20070272771A1 (en) | 2003-09-19 | 2004-09-07 | Fuel Injection Valve For Internal Combustion Engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003327214A JP4119812B2 (ja) | 2003-09-19 | 2003-09-19 | 燃料噴射弁 |
JP2003-327214 | 2003-09-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005028853A1 true WO2005028853A1 (ja) | 2005-03-31 |
Family
ID=34372862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/013295 WO2005028853A1 (ja) | 2003-09-19 | 2004-09-07 | 内燃機関用燃料噴射弁 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070272771A1 (ja) |
EP (1) | EP1666720B1 (ja) |
JP (1) | JP4119812B2 (ja) |
KR (1) | KR100730862B1 (ja) |
CN (1) | CN100480505C (ja) |
WO (1) | WO2005028853A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4066959B2 (ja) | 2004-01-27 | 2008-03-26 | 株式会社デンソー | 燃料噴射装置 |
DE102006053128A1 (de) * | 2006-11-10 | 2008-05-15 | Robert Bosch Gmbh | Injektor zum Einpritzen von Kraftstoff |
JP2011185264A (ja) * | 2010-02-11 | 2011-09-22 | Denso Corp | インジェクタ |
US8602319B2 (en) * | 2010-10-07 | 2013-12-10 | Caterpillar Inc. | Needle valve member with frustoconical guide segment and fuel injector using same |
DE102010042688A1 (de) * | 2010-10-20 | 2012-04-26 | Robert Bosch Gmbh | Kraftstoffinjektor |
DE102011003452A1 (de) * | 2011-02-01 | 2012-08-02 | Robert Bosch Gmbh | Kraftstoffeinspritzkomponente |
AT512893B1 (de) * | 2013-02-05 | 2013-12-15 | Bosch Gmbh Robert | Bauelement mit ineinandermündenden Hochdruckbohrungen |
JP2020051368A (ja) * | 2018-09-27 | 2020-04-02 | 日立建機株式会社 | 燃料噴射装置及び作業機械 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59130070U (ja) * | 1983-02-18 | 1984-08-31 | ダイハツ工業株式会社 | 内燃機関の燃料噴射弁 |
JPH04203259A (ja) * | 1990-11-28 | 1992-07-23 | Nippondenso Co Ltd | 燃料噴射弁 |
JPH07103106A (ja) | 1993-09-30 | 1995-04-18 | Hino Motors Ltd | 燃料噴射装置 |
GB2298897A (en) | 1995-03-17 | 1996-09-18 | Bosch Gmbh Robert | I.c.engine fuel injector |
JP2003206826A (ja) * | 2001-11-06 | 2003-07-25 | Denso Corp | 燃料噴射弁 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8318634D0 (en) * | 1983-07-09 | 1983-08-10 | Lucas Ind Plc | Fuel injection nozzles |
CN85102659B (zh) * | 1985-04-01 | 1986-11-12 | 大连工学院 | 多孔喷油嘴 |
CN2091361U (zh) * | 1991-05-21 | 1991-12-25 | 梁少平 | 一种用于柴油机直喷燃烧室的喷油嘴 |
DE10102234A1 (de) * | 2001-01-19 | 2002-07-25 | Bosch Gmbh Robert | Vorrichtung zur Kraftstoff-Hochdruckversorgung einer Brennkraftmaschine |
DE10147792C2 (de) * | 2001-09-27 | 2003-10-16 | Siemens Ag | Kraftstoffeinspritzventil |
JP4066959B2 (ja) * | 2004-01-27 | 2008-03-26 | 株式会社デンソー | 燃料噴射装置 |
-
2003
- 2003-09-19 JP JP2003327214A patent/JP4119812B2/ja not_active Expired - Fee Related
-
2004
- 2004-09-07 EP EP04772977A patent/EP1666720B1/en not_active Expired - Fee Related
- 2004-09-07 CN CNB2004800269667A patent/CN100480505C/zh not_active Expired - Fee Related
- 2004-09-07 US US10/572,550 patent/US20070272771A1/en not_active Abandoned
- 2004-09-07 KR KR1020067005465A patent/KR100730862B1/ko not_active IP Right Cessation
- 2004-09-07 WO PCT/JP2004/013295 patent/WO2005028853A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59130070U (ja) * | 1983-02-18 | 1984-08-31 | ダイハツ工業株式会社 | 内燃機関の燃料噴射弁 |
JPH04203259A (ja) * | 1990-11-28 | 1992-07-23 | Nippondenso Co Ltd | 燃料噴射弁 |
JPH07103106A (ja) | 1993-09-30 | 1995-04-18 | Hino Motors Ltd | 燃料噴射装置 |
GB2298897A (en) | 1995-03-17 | 1996-09-18 | Bosch Gmbh Robert | I.c.engine fuel injector |
JP2003206826A (ja) * | 2001-11-06 | 2003-07-25 | Denso Corp | 燃料噴射弁 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1666720A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1666720B1 (en) | 2012-07-18 |
KR100730862B1 (ko) | 2007-06-20 |
JP2005090421A (ja) | 2005-04-07 |
JP4119812B2 (ja) | 2008-07-16 |
EP1666720A4 (en) | 2010-08-04 |
EP1666720A1 (en) | 2006-06-07 |
US20070272771A1 (en) | 2007-11-29 |
CN100480505C (zh) | 2009-04-22 |
KR20060030123A (ko) | 2006-04-07 |
CN1853042A (zh) | 2006-10-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1382836B1 (en) | Fuel injector | |
US7273186B2 (en) | Fuel injection device | |
KR100875015B1 (ko) | 내연기관의 연소 챔버 내부로 연료를 분사하는 장치 | |
WO2005119047A1 (ja) | 燃料噴射弁 | |
US7568634B2 (en) | Injection nozzle | |
WO2005028853A1 (ja) | 内燃機関用燃料噴射弁 | |
JP4886232B2 (ja) | 前処理方法 | |
WO2005119046A1 (ja) | 燃料噴射弁 | |
EP2960485A1 (en) | Control valve | |
EP1659284B1 (en) | Fuel injection nozzle and method for manufacturing the same | |
KR20020038691A (ko) | 내연기관용 연료 분사 장치 | |
US20070075160A1 (en) | Fluid injection valve | |
JP2005320904A (ja) | 燃料噴射弁 | |
JP3818206B2 (ja) | 燃料噴射弁 | |
EP2187034A1 (en) | A fuel injector with axial sealing element | |
JP4415962B2 (ja) | インジェクタ | |
JP2004502089A (ja) | 内燃機関用の燃料噴射装置 | |
JP2006046221A (ja) | 燃料噴射弁 | |
JP4091889B2 (ja) | エンジンの燃料噴射装置 | |
JPH1150930A (ja) | 蓄圧式燃料噴射装置 | |
JP4134968B2 (ja) | 燃料噴射ノズル | |
JP2021050606A (ja) | 燃料噴射装置 | |
US6640782B2 (en) | Fuel-injection apparatus for internal combustion engines | |
KR20190000301A (ko) | 특히 자기 착화식 내연 기관용 연료 인젝터 | |
US20100200677A1 (en) | Fuel injection valve of accumulator injection system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200480026966.7 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BW BY BZ CA CH CN CO CR CU CZ DK DM DZ EC EE EG ES FI GB GD GE GM HR HU ID IL IN IS KE KG KP KR LC LK LR LS LT LU LV MA MD MG MN MW MX MZ NA NI NO NZ OM PG PL PT RO RU SC SD SE SG SK SL SY TM TN TR TT TZ UA UG US UZ VC YU ZA ZM |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SZ TZ UG ZM ZW AM AZ BY KG MD RU TJ TM AT BE BG CH CY DE DK EE ES FI FR GB GR HU IE IT MC NL PL PT RO SE SI SK TR BF CF CG CI CM GA GN GQ GW ML MR SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2004772977 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020067005465 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 1020067005465 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 2004772977 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10572550 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 10572550 Country of ref document: US |