CN100402834C - Fuel injection valve for internal combustion engines - Google Patents
Fuel injection valve for internal combustion engines Download PDFInfo
- Publication number
- CN100402834C CN100402834C CNB038257157A CN03825715A CN100402834C CN 100402834 C CN100402834 C CN 100402834C CN B038257157 A CNB038257157 A CN B038257157A CN 03825715 A CN03825715 A CN 03825715A CN 100402834 C CN100402834 C CN 100402834C
- Authority
- CN
- China
- Prior art keywords
- conical surface
- valve
- needle
- conical
- valve seat
- 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.)
- Expired - Fee Related
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 17
- 239000000446 fuel Substances 0.000 title abstract description 23
- 238000002347 injection Methods 0.000 title abstract description 6
- 239000007924 injection Substances 0.000 title abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 6
- 238000010304 firing Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000013011 mating Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 description 10
- 238000000926 separation method Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
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
- F02M61/16—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
-
- 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
- F02M61/1866—Valve seats or member ends having multiple cones
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
Disclosed is a fuel injection valve comprising a valve body (1) within which a borehole (3) is embodied. The end of said borehole (3), which faces the combustion chamber, is delimited by a conical valve seat (9). A piston-shaped valve needle (5) which cooperates with the conical valve seat (9) by means of a valve-sealing surface (7) is arranged inside the borehole (3) so as to be movable in a longitudinal direction. The valve-sealing surface (7) is provided with a first conical surface (30) and a second conical surface (32). The first conical surface (30) is located upstream of the second conical surface (32) while a sealing edge (34), by means of which the valve needle (5) cooperates with the valve seat (9), is configured between the conical surfaces (30; 32). Injection ports (11) that extend into the combustion chamber are embodied downstream of the sealing edge (34) within the valve body (1). At least two annular grooves (35) which are located upstream of the injection ports (11) are configured on the valve-sealing surface (7).
Description
Technical field
The present invention relates to a kind of Fuelinjection nozzle that is used for internal-combustion engine.
Background technique
As for example known from document DE 100 31 265 A1.The Fuelinjection nozzle that the there provides has a valve body, and in this valve body, a needle is placed in the hole with longitudinal movement.This hole towards the firing chamber by a valve seat restricted boundary, the tapered substantially structure of this valve seat.In addition, constitute a plurality of spray-holes on the combustion chamber side end of valve body, they lead to described hole in valve seat area, thereby produce being communicated with of described hole and firing chamber.This needle has a valve sealing surface with piston-like ground structure on its combustion chamber side end, this face comprises two conical surfaces with different subtended angles.Constitute a seal land between these two conical surfaces, it abuts on the valve seat in needle is in the closed position the time.Needle is with its valve sealing surface and valve seat mating reaction, makes that described spray-hole is closed when needle rests on the valve seat, and can flow to spray-hole between needle and hole wall from a pressure chamber that constitutes when needle fuel when valve seat lifts.
Because the fuel that comes out from the pressure chamber is under the high pressure, fuel at full speed flows in the annulus of opening between valve sealing surface and the valve seat when needle is opened stroke motion and begun.Between the seal land of needle and valve seat, form the narrowest cross section, make fuel flow rate maximum there.Since should be high-speed, the separation of fluid from boundary wall can take place, this feasible pressure foundation that can not estimate in the slit between valve sealing surface and the valve seat.The unlatching dynamic characteristic of needle also changes thus, and this dynamic characteristic is subjected to the decisive influence of the hydraulic pressure on the valve sealing surface.Particularly when emitted dose was little, emitted dose can change when determining operating point thus with foretelling, and this makes can not be to the accurate dosage of emitted dose.
Summary of the invention
According to the present invention, a kind of Fuelinjection nozzle that is used for internal-combustion engine has been proposed, has a valve body, hole of structure in this valve body, on the end of this Kong Zaiqi combustion chamber side by a conical valve seat limited boundary, and needle with a piston-like, this needle is arranged in the hole and with a valve sealing surface and conical valve seat mating reaction with longitudinal movement, wherein, this valve sealing surface comprises that one first conical surface and one second conical surface and first conical surface are arranged on the upstream of second conical surface, and has a seal land that between first conical surface and second conical surface, constitutes, needle is with sealing rib and valve seat mating reaction, also have some spray-holes of in valve body, constructing, these spray-holes are in the downstream configuration and feeding firing chamber of seal land, wherein, not only on second conical surface, and on first conical surface, construct more than one circular groove respectively, these circular grooves are positioned at the upstream of described spray-hole and are constructed to have micro-groove less than the degree of depth of 0.1mm.
Therefore, advantage with Fuelinjection nozzle of the present invention of such scheme feature is, pressure in valve sealing surface zone when needle is opened stroke motion set up can any operating point of internal-combustion engine again terrain carry out, thereby the accurate fuel quantity of dosage injection all the time.Construct at least two circular grooves on valve sealing surface, they bring an additional turbulent flow component in fuel stream, stop fluid to separate from peripheral wall thus for this reason.
In favourable scheme of the present invention, a plurality of circular grooves are being set on first conical surface or on second conical surface, this not only exerts an influence to the seal land front but also to the mobile of seal land back.Can effectively stop separation thus.Particularly for the situation that has a plurality of circular grooves, these circular grooves can have the little degree of depth and be configured, the effect that this is same with having only one or two darker circular groove convection current movable property looks, but obviously littler to the influence of needle mechanical stability.
If, be particularly advantageous not only on first conical surface but also on second conical surface circular groove being arranged all because thus not only in the seal land front, but also give birth to such influence at seal land back convection current movable property: make the separation that effectively stops fluid.
In another favourable scheme, these circular grooves have asymmetric type exterior feature on cross section.Can optimize the influence of flowing thus, utilize a less circular groove of the degree of depth to reach identical mobile influence.
In addition advantageously, these circular grooves are with micro-groove (Mikronuten) structure of the degree of depth less than 0.1mm.Some circular grooves like this can be easily for example by a laser processing in the surface of valve sealing surface, and have and do not influence or only not obvious the elasticity of needle and the advantage of other mechanical property of influencing.
Description of drawings
Express the different embodiments of Fuelinjection nozzle of the present invention in the accompanying drawings.Accompanying drawing is represented:
A longitudinal section of a Fuelinjection nozzle of the present invention of Fig. 1,
Use an enlarged view of the part of A mark among Fig. 2 Fig. 1,
The part that Fig. 3 is identical with Fig. 2, wherein, valve seat is differently constructed,
Fig. 4 and Fig. 5 additional embodiments, wherein shown part is identical with Fig. 2.
Embodiment
In Fig. 1, illustrate one according to Fuelinjection nozzle of the present invention with the longitudinal section.In a valve body 1 structure hole 3, on this Kong Zaiqi end by valve seat 9 limited boundaries of a taper.The a plurality of spray-holes 11 of structure on the combustion chamber side end of valve body 1, these spray-holes feed in the firing chamber of internal-combustion engine, and fuel can be injected in the firing chamber by them.Be provided with the needle 5 of a piston-like in hole 3 with longitudinal movement, this needle has one and is conical valve sealing surface 7 substantially on its combustion chamber side end, and needle 5 is with this valve sealing surface and valve seat 9 mating reactions.This needle 5 is directed in a guide section 23 in hole 3 by a section 15 that is directed to.By 15 of the sections that is directed to, needle 5 attenuates towards valve sealing surface 7, forms a pressure shoulder 13.Between pressure shoulder 13 and valve sealing surface 7, pressure chamber 19 of structure between the wall in needle 5 and hole 3, it is radially widened on the height of pressure shoulder 13.An input channel of extending in valve body 1 25 feeds in the radially widening portion of pressure chamber 19, and this input channel is to pressure chamber's 19 input fuel under high pressure.
The enlarged view of the part of using the A mark of Fig. 2 presentation graphs 1.Valve sealing surface 7 comprises two conical surfaces, and wherein, first conical surface 30 is connected on the piston-like section of needle 5.At one second conical surface 32 of downstream configuration of first conical surface 30, it feeds in the end face 42 on the combustion chamber side end of needle 5.The subtended angle of first conical surface 30 is greater than the subtended angle of conical valve seat 9, and the subtended angle of conical valve seat 9 is again greater than the subtended angle of second conical surface 32.Thus, constitute a seal land 34 between first conical surface 30 and second conical surface 32 on valve sealing surface 7, it abuts on the valve seat 9 in needle 5 is in the closed position the time.By the linear supporting surface of widening slightly owing to wear and tear at the Fuelinjection nozzle run duration of needle 5, guaranteed the excellent sealing of described spray-hole relative pressure chambers 19 11.
On first conical surface 30 structure a plurality of circular grooves 35, on second conical surface 32 too.These circular grooves 35 influence fuel as follows by flowing between valve sealing surface 7 and the valve seat 9: needle 5 open the motion beginning time, first conical surface 30 is loaded by the fuel pressure in the pressure chamber 19, this acts on a corresponding breaking force on needle 5.If needle lifts from valve seat 9 for 5 this moments, then fuel is because the high pressure in the pressure chamber 19 is mobile to described spray-hole 11 directions with high speed.At this, the narrowest position of fuel stream makes that flow velocity is the highest there between seal land 34 and valve seat 9, and the pressure on the while valve sealing surface 7 is minimum.Because high flow velocity fluid may take place flows separating of boundary wall with fuel, promptly particularly occur in the separation in second conical surface, 32 zones.The fuel motion that directly abuts on second conical surface must be than obviously slow to the fuel main flow that the spray-hole direction flows with very high-speed, little cross section.Because the cross section of residual fluid is little, pressure on second conical surface 32 is set up and is comprised under the situation in the whole slit between valve seat 9 and the valve sealing surface 7 obviously littler than fuel stream, this situation can produce less flow velocity under the identical situation of unit time emitted dose, thereby produces higher fuel static pressure.
This emitted dose determined by injection duration, in other words by Fuelinjection nozzle open time point and the shut-in time point is determined.Needle 5 slides how soon depend on the hydraulic open power that acts on pressure shoulder 13 and the valve sealing surface 7 to its open position.By the hydraulic coupling on second conical surface 32, after lifting, closed position produces an additional breaking force soon at needle 5, and it improves opening speed, thereby also improves the amount of spraying.If because mobility status described above has lacked this additional breaking force, then needle 5 is opened more lentamente, and spray less fuel until closing of needle 5.The loss of this emitted dose particularly comes across some operating point, promptly when certain pressure and depend on the stroke of needle 5, and under the little situation of emitted dose than more obvious under the big situation of emitted dose.
By structure circular groove 35 on first conical surface 30 and second conical surface 32, suppressed separating of fluid and valve sealing surface 7.35 pairs of fuel that flow through of a circular groove at first produce a cross section and widen, and produce a cross section again and shrink on the seamed edge that is positioned at the downstream of circular groove 35, and this plays the effect as another one throttling position.Thus, this fluid obtains a high turbulent flow component, and the pressure of determining in its load second conical surface zone is set up, thereby makes it possible to accurate dosage emitted dose.
In Fig. 3, these circular grooves 35 have bigger width ground structure, at this this width for for example 0.15 to 0.25mm.Constructing a circular groove 35 respectively on first conical surface 30 and on second conical surface 32, making the front at the throttling position of fluid in seal land 34 zone and back all by additional eddy current.In this embodiment, described spray-hole 11 is not directly from valve seat 9, but has connected a bag shape volume 38 (Sackvolumen) on valve seat 9, its constitute valve body 1 in the face of the tip of firing chamber and described spray-hole 11 from drawing here.
Another embodiment shown in Figure 4.At this, identical with embodiment shown in Fig. 3, all be provided with a circular groove 35 on first conical surface 30 and on second conical surface 32, but these circular grooves 35 see to have asymmetric type exterior feature on cross section, in other words, their flow resistance depends on the flow direction of the fuel that flows through on circular groove 35 next doors.In this way can be than under the situation of the even depth circular groove 35 that has the symmetric form exterior feature on the cross section, in fluid, introducing a higher eddy current.
Another embodiment shown in Figure 5.At this, between first conical surface 30 and second conical surface 32, on valve sealing surface 7, construct recessed 40 (Hinterschnitt) of side.At this, seal land 40 is constructed on the boundary line between first conical surface 30 and the side recessed 40.Two circular grooves 35 of structure on first conical surface 30, and on second conical surface 32, construct one.Although by recessed 40 fluids of side certain additional eddy current has taken place, can reach the optimization mobility status by described circular groove 35.
In the embodiment of Fig. 2, the width B of described circular groove is about 0.03mm to 0.1mm, depends on the quantity of circular groove 35 and the size of valve sealing surface.At this, the degree of depth is preferably 5 μ m to 50 μ m.In the circular groove as shown in the embodiment of Fig. 3 and Fig. 4, the width B of circular groove is about 0.1mm to 0.25mm, and is about 0.1mm apart from the distance D of seal land 34.
Claims (3)
1. the Fuelinjection nozzle that is used for internal-combustion engine, has a valve body (1), a structure hole (3) in this valve body, on the end of this Kong Zaiqi combustion chamber side by a conical valve seat (9) limited boundary, and needle (5) with a piston-like, this needle is arranged in the hole (3) and with longitudinal movement with a valve sealing surface (7) and conical valve seat (9) mating reaction, wherein, this valve sealing surface (7) comprises that one first conical surface (30) and one second conical surface (32) and first conical surface (30) are arranged on the upstream of second conical surface (32), and has a seal land (34) that between first conical surface (30) and second conical surface (32), constitutes, needle (5) is with sealing rib and valve seat (9) mating reaction, some spray-holes (11) that also have structure in valve body (1), these spray-holes are in the downstream configuration and feeding firing chamber of seal land (34), it is characterized in that, not only on second conical surface (32), and on first conical surface (30), construct more than one circular groove (35) respectively, these circular grooves are positioned at the upstream of described spray-hole (11) and are constructed to have micro-groove less than the degree of depth of 0.1mm.
2. Fuelinjection nozzle according to claim 1 is characterized in that, these circular grooves (35) are parallel to each other.
3. Fuelinjection nozzle according to claim 1 is characterized in that, these circular grooves (35) have asymmetric type exterior feature on cross section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002160975 DE10260975A1 (en) | 2002-12-24 | 2002-12-24 | Fuel injection valve for internal combustion engines |
| DE10260975.6 | 2002-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1717540A CN1717540A (en) | 2006-01-04 |
| CN100402834C true CN100402834C (en) | 2008-07-16 |
Family
ID=32477981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB038257157A Expired - Fee Related CN100402834C (en) | 2002-12-24 | 2003-05-23 | Fuel injection valve for internal combustion engines |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1579113A1 (en) |
| CN (1) | CN100402834C (en) |
| DE (1) | DE10260975A1 (en) |
| WO (1) | WO2004061291A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1522721B1 (en) * | 2003-10-06 | 2006-05-03 | Delphi Technologies, Inc. | Injection nozzle |
| DE10351881A1 (en) * | 2003-10-30 | 2005-06-02 | Robert Bosch Gmbh | Injector with structures for limiting wear-related changes of an opening course |
| AT414159B (en) * | 2004-07-22 | 2006-09-15 | Bosch Gmbh Robert | INJECTOR |
| DE102005025135A1 (en) * | 2005-06-01 | 2006-12-07 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| US20120223164A1 (en) | 2009-09-14 | 2012-09-06 | Junmei Shi | Nozzle assembly for an injection valve and injection valve |
| DE102011007887A1 (en) * | 2011-04-21 | 2012-10-25 | Continental Automotive Gmbh | Nozzle assembly for an injection valve and injection valve |
| DE102015206467A1 (en) * | 2015-02-17 | 2016-08-18 | Robert Bosch Gmbh | Injection valve for a gaseous or liquid medium and method for producing such an injection valve |
| CN108005826B (en) * | 2017-11-21 | 2021-07-02 | 山东鑫亚精密机械制造有限公司 | Frequency conversion fuel sprayer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19931891A1 (en) * | 1999-07-08 | 2001-01-18 | Siemens Ag | Fuel-injection valve for combustion engine |
| CN1290327A (en) * | 1998-03-25 | 2001-04-04 | 罗伯特·博施有限公司 | Fuel injection valve |
| WO2001051804A2 (en) * | 2000-01-08 | 2001-07-19 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| US6467702B1 (en) * | 1999-06-25 | 2002-10-22 | Delphi Technologies, Inc. | Fuel injector |
| WO2002090761A1 (en) * | 2001-05-10 | 2002-11-14 | Robert Bosch Gmbh | Valve comprising radial recesses |
| CN1383470A (en) * | 2000-06-27 | 2002-12-04 | 罗伯特·博施有限公司 | Fuel injection valve for internal combustion engines |
| CN1383471A (en) * | 2000-06-27 | 2002-12-04 | 罗伯特·博施有限公司 | Fuel injection valve for I.C. engines |
-
2002
- 2002-12-24 DE DE2002160975 patent/DE10260975A1/en not_active Withdrawn
-
2003
- 2003-05-23 CN CNB038257157A patent/CN100402834C/en not_active Expired - Fee Related
- 2003-05-23 EP EP03740025A patent/EP1579113A1/en not_active Withdrawn
- 2003-05-23 WO PCT/DE2003/001675 patent/WO2004061291A1/en not_active Application Discontinuation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290327A (en) * | 1998-03-25 | 2001-04-04 | 罗伯特·博施有限公司 | Fuel injection valve |
| US6467702B1 (en) * | 1999-06-25 | 2002-10-22 | Delphi Technologies, Inc. | Fuel injector |
| DE19931891A1 (en) * | 1999-07-08 | 2001-01-18 | Siemens Ag | Fuel-injection valve for combustion engine |
| WO2001051804A2 (en) * | 2000-01-08 | 2001-07-19 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engines |
| CN1383470A (en) * | 2000-06-27 | 2002-12-04 | 罗伯特·博施有限公司 | Fuel injection valve for internal combustion engines |
| CN1383471A (en) * | 2000-06-27 | 2002-12-04 | 罗伯特·博施有限公司 | Fuel injection valve for I.C. engines |
| WO2002090761A1 (en) * | 2001-05-10 | 2002-11-14 | Robert Bosch Gmbh | Valve comprising radial recesses |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10260975A1 (en) | 2004-07-08 |
| CN1717540A (en) | 2006-01-04 |
| WO2004061291A1 (en) | 2004-07-22 |
| EP1579113A1 (en) | 2005-09-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080716 Termination date: 20100523 |