EP2126333A1 - Kraftstoffinjektor mit koppler - Google Patents
Kraftstoffinjektor mit kopplerInfo
- Publication number
- EP2126333A1 EP2126333A1 EP07858229A EP07858229A EP2126333A1 EP 2126333 A1 EP2126333 A1 EP 2126333A1 EP 07858229 A EP07858229 A EP 07858229A EP 07858229 A EP07858229 A EP 07858229A EP 2126333 A1 EP2126333 A1 EP 2126333A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coupler
- valve member
- fuel injector
- injection valve
- valve piston
- 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
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
-
- 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
- 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
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/167—Means for compensating clearance or thermal expansion
Definitions
- DE 196 50 865 A1 discloses a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, for example for a common rail injection system.
- the fuel pressure in the control chamber controls a stroke movement of a valve piston with which an injection opening of the injection valve is opened or closed.
- the solenoid valve comprises an electromagnet, a movable armature and a valve member which is moved with the armature and acted upon by a valve closing spring in the closing direction, which cooperates with the valve seat of the solenoid valve and thus controls the fuel drain from a control chamber.
- the hydraulic coupler comprises a coupler sleeve with an internal bore in which the valve piston is guided.
- the diameter of the coupler sleeve is larger than the outer diameter of the needle-shaped injection valve member.
- the coupler sleeve rests on a nozzle body at its lower end with a sealing edge formed on its end face and thus encloses a coupler volume.
- the coupler sleeve is made in the idle state with a small, applied via a coil spring force to an end face of the nozzle needle.
- the coupler sleeve or the coupler is surrounded by fuel under system pressure.
- system pressure is meant the fuel pressure level generated in a fuel injection system, such as via a high pressure pump, within a high pressure reservoir body (common rail).
- valve piston If the fuel injector is activated, the valve piston first moves upwards. This upward movement creates a negative pressure in the coupler volume compared to the external system pressure level. Due to the negative pressure, the na- delförmig formed injection valve member the valve piston and, consequently, rests again on its front end opposite the preferably needle-shaped injection valve member. As the valve piston stroke increases, the pressure in the coupler volume decreases because, due to the difference in diameter between the inner bore of the coupler sleeve and the outer diameter of the needle-shaped injection valve member, the available fuel volume in the coupler increases. After the end of the control, the valve piston and the needle-shaped injection valve member move back in the closing direction.
- the coupler sleeve on the valve piston with a comparatively large guide clearance in the order of a few microns, z. B. 8 microns, and over a length of a few mm, such. B. 5 mm, out.
- the inner diameter of the coupler sleeve is about 3.8 mm and the outer diameter of the needle-shaped injection valve member is 3.5 mm.
- This design leads to a lag of the coupler pressure compared to the system pressure at rest in the order of 100 microseconds. About this game runs during the lifting movement of the valve piston - as mentioned above - a quantity of fuel after.
- a leak-free fuel injector which by means of an actuator, such as. B. a solenoid valve, is operable, wherein the difference in diameter between the inner diameter of the coupler sleeve and the outer diameter of the preferably needle-shaped injection valve member is not more than 0.2 mm.
- the guide play between the injection valve member enclosing the coupler sleeve and the valve piston guided therein is reduced, in particular to a value of a few microns, such. B. to values of less than 5 microns. Due to the fact that the inflow volume flow is proportional to the pressure difference over the guide length but inversely proportional to the third power of the guide game, this measure is highly effective in terms of the flow of fuel into the coupler.
- the guide length between the preferably needle-shaped injection valve member surrounding the coupler sleeve and the needle-shaped injection valve member can be increased to values of more than 5 mm. Since the time delay increases more and more until the needle-shaped injection valve member is opened as the volume of the coupler increases, the volume of the coupler remains limited to values ⁇ 40 mm 3 in the idle state.
- Figure 1 shows a fuel injector of the prior art with a coupling between the valve piston of a coupler and a needle-shaped injection valve member and
- FIG. 2 shows the embodiment of a hydraulic coupling between a valve piston of a coupler and a needle-shaped injection valve element designed in particular according to the invention.
- FIG. 1 shows an embodiment of a coupler for a fuel injector according to the prior art.
- a fuel injector 10 comprises an injection needle member 12, which is in particular of a needle-shaped design.
- the needle-shaped injection valve member 12 is guided in a bore 14 of a nozzle body 18.
- the fuel injector 10 includes a cavity 16 in which system pressure p sys prevails.
- the system pressure p sys corresponds to a pressure level which z. B. by a high pressure pumping unit in a storage body (common rail) is generated.
- the nozzle body 18 comprises a bore 14, in which the injection needle member 12, which is in particular of a needle-shaped design, is guided, and which has an end face 20.
- An axis of the injection needle member 12, which is in particular needle-shaped, is designated by reference numeral 22 and runs coaxially to the axis of a valve piston 24.
- the valve piston 24 comprises an end face 26, which is opposite to an end face 28 of the injection needle member 12, which is in particular needle-shaped.
- the valve piston 24 is enclosed by a coupler sleeve 30.
- the coupler which comprises the valve piston 24 and the coupler sleeve 30 surrounding it, the stroke movement of an actuator, such as an electrode romagneten or a piezoelectric actuator to which in particular needle-shaped injection valve member 12 transmit.
- an actuator such as an electrode romagneten or a piezoelectric actuator to which in particular needle-shaped injection valve member 12 transmit.
- the coupler sleeve 30 comprises a first end face 32 and a second end face 34.
- a biting edge 36 is formed on the second end face 34 of the coupler sleeve 30. With the biting edge 36, the coupler sleeve 30 is set against the end face 20 of the nozzle body 18.
- the coupler sleeve 30 is acted upon by a biasing element, not shown in Figure 1 with a biasing force.
- the illustration according to FIG. 1 shows that the valve piston 24, which is part of the hydraulic coupler, comprises a constriction 38.
- the fuel injector 10 shown in Figure 1 has between the inner diameter of the coupler sleeve 30 and the outer diameter of the injection valve member 12 has a diameter difference in the order of 0.3 mm.
- This guide clearance leads to a lag of the coupler pressure with respect to the system pressure p sys by about 100 ⁇ s. Due to the guide clearance, which results from the difference in diameter in the order of 0.3 mm, runs during the lifting movement of the valve piston 24, a fuel quantity after. Since the coupler sleeve 30 lifts off after each injection of the end face 20 of the nozzle body 18, the coupler sleeve 30 is found after each injection a slightly different position, wherein the shape of the guide gap changes from injection to injection process.
- the amount of fuel flowing into the coupler volume influences the closing movement and the closing time of the preferably needle-shaped injection valve member 12, which leads to stroke / stroke spreads that are significantly greater in comparison to conventional injectors.
- the valve piston is surrounded by fuel under reflux (low pressure). This results in a continuous leakage from the control chamber along the valve piston guide on the one hand and from the high-pressure chamber along the injection valve member along the guide of the injection valve member in the surrounding the valve piston volume.
- the volume surrounding the valve piston is connected to the high pressure area.
- the leakage is omitted due to the lack of a pressure gradient on the guides of the relatively movable components.
- FIG. 2 shows a section through a coupler proposed according to the invention. From Figure 2 shows that the fuel injector 10 the needle-shaped injection valve member 12 includes, which is guided in the bore 14 of the nozzle body 18. In the cavity 16 of the fuel injector 10 system pressure p sys prevails. At the end face 20 of the nozzle body 18, the coupler sleeve 30 is employed. The first end face is identified by reference numeral 32 and the second end side by reference numeral 34. In contrast to the coupler sleeve 30 shown in FIG. 1, the coupler sleeve 30 used on the fuel injector 10 proposed according to the invention has a substantially rectangular cross-section. The axis of the preferably needle-shaped injection valve member 12 is designated by reference numeral 22.
- the biting edge 36 is located on the second end face 34 of the coupler sleeve 30, which has a substantially rectangular cross-section.
- the coupler sleeve 30 is set against the end face 20 of the nozzle body 18 due to the effect of an adjusting force 50. From the illustration according to FIG. 2, it is also clear that a guide play 40 between the inner diameter 46 of the coupler sleeve 30 and the outer diameter of the valve piston 24 is ⁇ 5 ⁇ m.
- the valve piston 24 has in the area, ie its guide length 58, in which this is guided in the coupler sleeve 30, the diameter 46, taking into account the guide clearance 40 of ⁇ 5 microns on the coupler sleeve 30.
- Transition region 42 indicated within which the diameter of the valve piston 24 merges into a diameter which corresponds to the diameter of the nozzle body 18 formed in the bore 14 and which corresponds substantially to the outer diameter 44 of the injection valve member 12.
- the illustration according to FIG. 2 shows that in the illustrated stage of the lifting phase of the preferably needle-shaped injection valve member 12 and the valve piston 24 of the coupler, the end face 26 of the valve piston 24 bears against an end face 28 of the preferably needle-shaped injection valve member 12.
- a coupler space 54 is formed, which has a coupler volume which is of the order of ⁇ 40 mm 3 .
- the bore 14, in which a part of the valve piston 24 of the coupler and the preferably needle-shaped injection valve member 12 in Nozzle body 18 are guided, has a chamfer 52 on the end face 20.
- a bevel 56 may be formed on the end face 26 of the valve piston 24 of the coupler.
- the end faces 26 and 28 of the valve piston 24 or preferably needle-shaped injection valve member 12 executed plan.
- the fuel injector 10 shown in the illustration according to Figure 2 on the one hand has a difference in diameter between the inner diameter 46 of the coupler sleeve 30 and the outer diameter 44 of the preferably needle-shaped injection valve member 12 between 0.2 mm and 0 mm. Due to this small remaining difference in diameter, the pressure drop within the coupler during the lifting movement of the preferably needle-shaped injection valve member 12 is reduced. If the difference in diameter between the inner diameter 46 of the coupler sleeve 30 and the outer diameter 44 of the preferably needle-shaped injection valve member 12 0 mm, creates a pressure difference ⁇ p only during the lifting of the preferably needle-shaped injection valve member 12 from its seat and disappears again, as soon as the preferred needle-shaped Injector valve member has left the seat throttle area.
- the guide play 50 between the coupler sleeve 30 and the valve piston 24 is reduced to values ⁇ 5 ⁇ m, so that the volume flow flowing in via the reduced guide play 50 into the coupler space 54 is effectively reduced. Furthermore, as shown in FIG. 2, the guide length 58, within which the valve piston 24 of the coupler is guided in the coupler sleeve 30, is considerably longer in comparison to the guide length shown in FIG. In order to achieve a lag-free as possible lagging the preferably needle-shaped injection valve member 12 relative to the valve piston 24, the fuel volume within the coupler sleeve 30 in the closed state of the fuel injector is limited to values ⁇ 40 mm 3 .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
- Feeding And Controlling Fuel (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007002282A DE102007002282A1 (de) | 2007-01-16 | 2007-01-16 | Kraftstoffinjektor mit Koppler |
| PCT/EP2007/064641 WO2008086941A1 (de) | 2007-01-16 | 2007-12-28 | Kraftstoffinjektor mit koppler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2126333A1 true EP2126333A1 (de) | 2009-12-02 |
| EP2126333B1 EP2126333B1 (de) | 2010-09-29 |
Family
ID=39481238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07858229A Active EP2126333B1 (de) | 2007-01-16 | 2007-12-28 | Kraftstoffinjektor mit koppler |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US7992810B2 (de) |
| EP (1) | EP2126333B1 (de) |
| JP (1) | JP5002023B2 (de) |
| CN (1) | CN101583790A (de) |
| AT (1) | ATE483106T1 (de) |
| BR (1) | BRPI0718797B1 (de) |
| DE (2) | DE102007002282A1 (de) |
| RU (1) | RU2452867C2 (de) |
| WO (1) | WO2008086941A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3499213B1 (de) * | 2017-12-15 | 2021-09-15 | Microjet Technology Co., Ltd. | Feinstaubmessvorrichtung |
| CN114135430B (zh) * | 2021-12-08 | 2023-01-06 | 一汽解放汽车有限公司 | 一种燃料喷射阀 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3767260D1 (de) * | 1986-09-25 | 1991-02-14 | Ganser Hydromag | Kraftstoffeinspritzventil. |
| DE4026721A1 (de) * | 1990-08-24 | 1992-02-27 | Bosch Gmbh Robert | Einspritzventil und verfahren zur herstellung eines einspritzventils |
| DE19500706C2 (de) | 1995-01-12 | 2003-09-25 | Bosch Gmbh Robert | Zumeßventil zur Dosierung von Flüssigkeiten oder Gasen |
| DE19650865A1 (de) | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | Magnetventil |
| DE19946827C1 (de) * | 1999-09-30 | 2001-06-21 | Bosch Gmbh Robert | Ventil zum Steuern von Flüssigkeiten |
| DE10145620B4 (de) * | 2001-09-15 | 2006-03-02 | Robert Bosch Gmbh | Ventil zum Steuern von Flüssigkeiten |
| DE102004035280A1 (de) | 2004-07-21 | 2006-03-16 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkter mehrstufiger Einspritzventilgliedansteuerung |
| DE102005007543A1 (de) * | 2005-02-18 | 2006-08-24 | Robert Bosch Gmbh | Kraftstoffinjektor mit direkter Nadelsteuerung für eine Brennkraftmaschine |
| RU2280781C1 (ru) * | 2005-03-05 | 2006-07-27 | Федеральное государственное образовательное учреждение высшего профессионального образования Воронежский государственный аграрный университет им. К.Д. Глинки | Электрогидравлическая форсунка для дизеля |
-
2007
- 2007-01-16 DE DE102007002282A patent/DE102007002282A1/de not_active Withdrawn
- 2007-12-28 US US12/520,563 patent/US7992810B2/en active Active
- 2007-12-28 DE DE502007005235T patent/DE502007005235D1/de active Active
- 2007-12-28 CN CNA2007800499959A patent/CN101583790A/zh active Pending
- 2007-12-28 BR BRPI0718797-1A patent/BRPI0718797B1/pt active IP Right Grant
- 2007-12-28 WO PCT/EP2007/064641 patent/WO2008086941A1/de not_active Ceased
- 2007-12-28 RU RU2009131122/06A patent/RU2452867C2/ru active
- 2007-12-28 EP EP07858229A patent/EP2126333B1/de active Active
- 2007-12-28 JP JP2009545135A patent/JP5002023B2/ja not_active Expired - Fee Related
- 2007-12-28 AT AT07858229T patent/ATE483106T1/de active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008086941A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010515855A (ja) | 2010-05-13 |
| BRPI0718797B1 (pt) | 2018-08-07 |
| JP5002023B2 (ja) | 2012-08-15 |
| DE502007005235D1 (de) | 2010-11-11 |
| EP2126333B1 (de) | 2010-09-29 |
| US7992810B2 (en) | 2011-08-09 |
| US20100090032A1 (en) | 2010-04-15 |
| WO2008086941A1 (de) | 2008-07-24 |
| DE102007002282A1 (de) | 2008-07-17 |
| ATE483106T1 (de) | 2010-10-15 |
| BRPI0718797A2 (pt) | 2013-12-03 |
| CN101583790A (zh) | 2009-11-18 |
| RU2452867C2 (ru) | 2012-06-10 |
| RU2009131122A (ru) | 2011-02-27 |
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