EP1373715A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP1373715A1 EP1373715A1 EP02727266A EP02727266A EP1373715A1 EP 1373715 A1 EP1373715 A1 EP 1373715A1 EP 02727266 A EP02727266 A EP 02727266A EP 02727266 A EP02727266 A EP 02727266A EP 1373715 A1 EP1373715 A1 EP 1373715A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- valve member
- sealing surface
- fuel
- fuel injection
- 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 45
- 239000007924 injection Substances 0.000 title claims abstract description 45
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 43
- 239000000446 fuel Substances 0.000 claims abstract description 35
- 230000007704 transition Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000002349 favourable effect 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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1873—Valve seats or member ends having circumferential grooves or ridges, e.g. toroidal
-
- 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
- F02M61/047—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 the valves being formed by deformable nozzle parts, e.g. flexible plates or discs with fuel discharge orifices
-
- 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
- F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
Definitions
- the invention is based on a fuel injection valve for internal combustion engines, as is known, for example, from the published patent application DE 196 18 650 AI.
- a fuel injection valve has a valve body in which a bore is formed.
- a piston-shaped valve member is arranged so as to be longitudinally displaceable, which has a valve sealing surface on its combustion chamber end, which cooperates with a valve seat formed on the combustion chamber end of the bore.
- the valve member is surrounded by a pressure chamber formed in the valve body, this pressure chamber being able to be filled with fuel under high pressure and extending to the valve seat.
- At least one injection opening is formed in the valve seat, which connects the bore and thus the pressure chamber to the combustion chamber of the internal combustion engine.
- valve seat is essentially conical, the tip of the cone forming the conical surface facing the combustion chamber.
- the valve sealing surface of the valve member is accordingly also conical, the valve sealing surface having two cone surfaces with different angles of inclination, so that a sealing edge is formed at the transition between these two cone surfaces. In the closed position of the valve member, that is, when the valve sealing surface rests on the valve seat, this sealing edge is inserted into the valve seat. presses, so that a secure seal of the pressure chamber with respect to the injection openings is possible.
- the valve member is acted upon by a device with a closing force which presses the valve member onto the valve seat. Due to the hydraulic pressure in the pressure chamber, the valve member experiences a force acting in the axial direction, which is directed against this closing force. If the pressure in the pressure chamber exceeds an opening pressure, the hydraulic force on the valve member becomes greater than the closing force and the valve member moves away from the valve seat from the closed position.
- the size of this opening pressure depends, among other things, on the diameter of the sealing edge on the valve seat.
- a change in the opening pressure is accompanied by a change in the injection characteristic of the injection valve, so that an at least approximately constant opening pressure is essential for optimal injection.
- the known fuel injection valve has the disadvantage that the sealing edge formed by the transition of the two conical surfaces is driven into the valve seat during operation of the fuel injection valve, as a result of which the hydraulically effective sealing line diameter changes over time and the opening pressure does not remain constant , This is a major disadvantage, particularly with modern fuel injection systems that are optimized for low pollutant emissions.
- the fuel injection valve according to the invention with the characterizing features of claim 1 has the advantage that the opening pressure of the fuel injection valve does not change during operation.
- the valve member has an end region in which two annular grooves are formed.
- the first annular groove is arranged in a radial plane of the longitudinal axis of the valve member and the second annular groove is arranged axially displaced to the valve seat and parallel to the first annular groove.
- the end region of the valve member is divided into three sections, the valve sealing surface being formed on an annular web remaining between the two annular grooves.
- the hydraulically effective sealing edge is formed at the transition from the first annular groove to the valve sealing surface, the diameter of which cannot change during operation of the fuel injection valve.
- the annular web of the valve member which remains between the two annular grooves and whose outer lateral surface forms the valve sealing surface, is designed to be resilient on the outer edge in the longitudinal direction of the valve member.
- the valve sealing surface can be optimally adapted to the valve seat, so that the valve sealing surface is optimally seated on the valve seat even in the time immediately before the injection, when the valve body expands somewhat elastically due to the increasing pressure in the pressure chamber.
- the first annular groove is always hydraulically connected to the pressure chamber.
- the hydraulic pressure in the first annular groove expands it somewhat elastically, so that the annular web of the valve member remaining between the two annular grooves is at the beginning of the opening stroke movement. is pressed against the valve seat. This ensures that the hydraulically effective sealing line diameter always corresponds to the edge which is formed at the transition from the first annular groove to the valve sealing surface. This applies regardless of the angular tolerances when new or the wear over the lifetime.
- the edges which are formed at the transition of the annular grooves to the valve sealing surface are made rounded or beveled. This results in a reduction in the notch effect by pressing these edges into the valve seat. As a result, there is better high-pressure stability and enables the resilient ring web of the valve sealing surface to roll on the valve seat during the opening or closing movement.
- FIG. 1 shows a longitudinal section through a fuel injection valve
- Figure 2 is an enlargement of the section designated by II of Figure 1 and - Figure 3 is an enlargement of Figure 2 of the section designated by III. Description of the embodiment
- a valve body 1 which is part of a fuel injection system for
- Forms internal combustion engines has a bore 3, in which a piston-shaped valve member 5 is longitudinally displaceably arranged, which has a longitudinal axis 6.
- the closed end of the bore 3 faces the combustion chamber.
- the valve member 5 is sealingly guided in a section facing away from the combustion chamber in the bore 3 and tapers towards the combustion chamber to form a pressure shoulder 9.
- the valve member 5 merges into an essentially conical end region 22 which also has a conical end on the combustion chamber side Interacts end of the bore 3 trained valve seat 18.
- a radial expansion of the bore 3 forms a pressure chamber 7 at the level of the pressure shoulder 9, which continues as an annular channel surrounding the valve member 5 up to the valve seat 18.
- the pressure chamber 7 is connected to a high-pressure fuel source, not shown in the drawing, so that it can be filled with fuel under high pressure.
- a guide section 10 is formed on the valve member 5, through which the valve member 5 is guided in a guide region 14 of the bore 3.
- several, for example four, recesses 12 are arranged on the guide section 10, which are arranged evenly distributed over the circumference of the valve member 5 and which allow the fuel flow.
- At least one injection opening 20 is formed in the valve seat 18 and connects the bore 3 to the combustion chamber of the internal combustion engine. The longitudinal movement of the valve member 5 the at least one injection opening 20 is released or closed so that fuel from the pressure chamber 7 through the injection opening 20 can get into the combustion chamber of the internal combustion engine through the valve member 5.
- the control of the injection activity of the fuel injection valve is carried out by hydraulic forces.
- An injection cycle looks as follows: the valve member 5 is acted upon by a closing force by a device, not shown in the drawing, which presses the valve member 5 with the end region 22 onto the valve seat 18.
- the pressure chamber 7 is closed off from the injection openings and no fuel reaches the combustion chamber of the internal combustion engine through the injection openings 20.
- a hydraulic force results in the longitudinal direction of the valve member 5 by acting on the pressure shoulder 9 and at least partial areas of the end area 22. If these hydraulic forces exceed the closing force on the valve member, this moves Valve member 5 away from the valve seat 18 and the end region 22 lifts off the valve seat 18.
- FIG. 2 shows an enlargement of FIG. 1 in a section labeled II.
- the essentially conical end surface 22 of the valve member 5 has a first annular groove 30 and a second annular groove 32, the second annular groove being arranged axially displaced to the first annular groove 30, but both annular grooves 30, 32 being parallel to one another.
- the annular grooves 30, 32 are each arranged at least approximately in a radial plane with respect to the longitudinal axis 6 of the valve member 5.
- the end region 22 of the valve member 5 is divided into three sections, a first conical surface 24 which directly adjoins the valve member 5 being formed, a valve sealing surface 26 formed between the two annular grooves 30, 32 and a second conical surface 28, which Combustion chamber facing end of the valve member 5 forms.
- the valve sealing surface 26 is formed on an annular web 27 remaining between the annular grooves 30, 32.
- the first cone surface 24, the valve sealing surface 26 and the second cone surface 28 all have at least approximately the same cone angle, but is the first
- the conical surface 24 and the second conical surface 28 are set back somewhat, so that in the closed position of the valve member 5, that is, when the pressure chamber 7 is closed against the injection openings 20, only the valve sealing surface 26 comes into contact with the valve seat 18. This position is shown in Figure 2. Due to the recessed first conical surface 24, the first annular groove 30 always remains hydraulically connected to the pressure chamber 7, since there is always a gap between the first conical surface 24 and the valve seat 18.
- FIG. 3 shows an enlargement of FIG. 2 in the area designated by III.
- the valve member 5 is in a slightly open state here, so that the valve sealing surface 26 does not abut the valve seat 18.
- the hydraulically acted upon by the pressure in the pressure chamber 7 Part of the end region 22 of the valve member 5 corresponds to the first conical surface 24 up to the first edge 35, which is formed at the transition from the first annular groove 30 to the valve sealing surface 26 and which forms the sealing line.
- the hydraulic forces acting in the axial direction on the walls of the first annular groove 30 cancel each other out.
- the annular web 27 between the two annular grooves 30, -32 is designed to be resilient on its outer edge, so that when the valve member 5 bears against the valve seat 18, the valve sealing surface 26 is somewhat is deformed away from the combustion chamber, as a result of which the sealing surface 26 always lies optimally against the valve seat 18.
- the deformation of the valve sealing surface 26 can go so far that the second conical surface 28 comes into contact with the valve seat 18 in the closed state of the fuel injection valve and thereby limits the deformation of the valve sealing surface 26. If the second conical surface 28 covers the injection opening 20, the space of the injection valve connected to the combustion chamber and filled with fuel is minimized between the individual injections, which has a favorable effect on the pollutant emission of the internal combustion engine.
- the annular web 27 with the valve sealing surface 26 formed thereon has a height D in the direction of the longitudinal axis 6, which must be such that elastic deformations are made possible without the valve sealing surface 26 losing its stability.
- the amount D is therefore preferably 0.3 mm to 0.5 mm, the axial height of the annular grooves 30/32 is about 0.2 mm to 0.4 mm.
- valve sealing surface 26 that is to say the first edge 35 facing away from the combustion chamber and the second edge 37 facing the combustion chamber, rounded or beveled.
- the valve sealing surface 26 can roll on the valve seat 18 during the opening movement of the valve member 5 and the notch stresses which arise when the edges 35, 37 are pressed into the valve seat 18 are thereby minimized.
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 |
|---|---|---|---|
| DE10115216 | 2001-03-28 | ||
| DE10115216A DE10115216A1 (de) | 2001-03-28 | 2001-03-28 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| PCT/DE2002/001091 WO2002077445A1 (de) | 2001-03-28 | 2002-03-26 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1373715A1 true EP1373715A1 (de) | 2004-01-02 |
| EP1373715B1 EP1373715B1 (de) | 2005-01-05 |
Family
ID=7679340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02727266A Expired - Lifetime EP1373715B1 (de) | 2001-03-28 | 2002-03-26 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6923388B2 (de) |
| EP (1) | EP1373715B1 (de) |
| JP (1) | JP2004518890A (de) |
| DE (2) | DE10115216A1 (de) |
| WO (1) | WO2002077445A1 (de) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10245573A1 (de) * | 2002-09-27 | 2004-04-08 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| DE10259169A1 (de) * | 2002-12-18 | 2004-07-01 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschine |
| RU2240439C1 (ru) * | 2003-04-04 | 2004-11-20 | Московский автомобильно-дорожный институт (Государственный технический университет) | Форсунка многотопливного дизеля |
| DE10322826A1 (de) * | 2003-05-19 | 2004-12-09 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
| EP1559903B1 (de) * | 2004-01-28 | 2008-12-10 | Continental Automotive Italy S.p.A. | Einspritzventil mit verformbarer Nadel |
| EP1559905A1 (de) * | 2004-01-29 | 2005-08-03 | Siemens VDO Automotive S.p.A. | Einspritzventil mit einem verformbaren Ventilnadel |
| DE102004021340A1 (de) * | 2004-04-30 | 2005-11-24 | Siemens Ag | Düsenbaugruppe und Ventil |
| CA2662123C (en) * | 2006-08-30 | 2015-12-01 | Jagotec Ag | Controlled release oral dosage formulations comprising a core and one or more barrier layers |
| DE102009042155A1 (de) * | 2009-09-21 | 2011-04-07 | Continental Automotive Gmbh | Kraftstoff-Einspritzventil für eine Brennkraftmaschine |
| WO2012085901A2 (en) * | 2011-05-09 | 2012-06-28 | Lietuvietis Vilis I | Valve covered orifice pressure equalizing channel |
| DE102016203028A1 (de) * | 2016-02-26 | 2017-08-31 | Bayerische Motoren Werke Aktiengesellschaft | Kraftstoffinjektor |
| CN107143452B (zh) * | 2017-07-17 | 2024-03-08 | 辽阳新风科技有限公司 | 一种油嘴偶件、喷油器及汽车 |
| US11746734B2 (en) * | 2018-08-23 | 2023-09-05 | Progress Rail Services Corporation | Electronic unit injector shuttle valve |
| DE102019210551A1 (de) * | 2019-07-17 | 2021-01-21 | Robert Bosch Gmbh | Kraftstoffinjektor |
| CN112282999B (zh) * | 2020-10-30 | 2021-10-22 | 安徽江淮汽车集团股份有限公司 | 一种能够降低落座声的喷油器结构 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1952816A (en) | 1931-04-04 | 1934-03-27 | Bendix Res Corp | Fuel injector |
| DE2543805C2 (de) * | 1975-10-01 | 1986-05-07 | Robert Bosch Gmbh, 7000 Stuttgart | Elektromagnetisch betätigbares Einspritzventil |
| DE3878599T2 (de) * | 1987-06-26 | 1993-09-23 | Hitachi Automotive Eng | Elektromagnetisches kraftstoffeinspritzventil. |
| DE19618650B4 (de) | 1996-05-09 | 2006-04-27 | Robert Bosch Gmbh | Verfahren zur Herstellung eines Kraftstoffeinspritzventils für Brennkraftmaschinen |
| DE19844638A1 (de) | 1998-09-29 | 2000-03-30 | Siemens Ag | Kraftstoffeinspritzventil für eine Brennkraftmaschine |
| DE19931891A1 (de) * | 1999-07-08 | 2001-01-18 | Siemens Ag | Kraftstoffeinspritzventil für eine Brennkraftmaschine |
| DE19944638A1 (de) | 1999-09-17 | 2001-03-22 | Hettich Paul Gmbh & Co | Befestigungsanordnung |
-
2001
- 2001-03-28 DE DE10115216A patent/DE10115216A1/de not_active Withdrawn
-
2002
- 2002-03-26 US US10/296,712 patent/US6923388B2/en not_active Expired - Fee Related
- 2002-03-26 DE DE50201953T patent/DE50201953D1/de not_active Expired - Lifetime
- 2002-03-26 JP JP2002575467A patent/JP2004518890A/ja active Pending
- 2002-03-26 WO PCT/DE2002/001091 patent/WO2002077445A1/de not_active Ceased
- 2002-03-26 EP EP02727266A patent/EP1373715B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO02077445A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US6923388B2 (en) | 2005-08-02 |
| DE10115216A1 (de) | 2002-10-10 |
| US20030173428A1 (en) | 2003-09-18 |
| JP2004518890A (ja) | 2004-06-24 |
| DE50201953D1 (de) | 2005-02-10 |
| EP1373715B1 (de) | 2005-01-05 |
| WO2002077445A1 (de) | 2002-10-03 |
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