EP1802864A1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinenInfo
- Publication number
- EP1802864A1 EP1802864A1 EP05797092A EP05797092A EP1802864A1 EP 1802864 A1 EP1802864 A1 EP 1802864A1 EP 05797092 A EP05797092 A EP 05797092A EP 05797092 A EP05797092 A EP 05797092A EP 1802864 A1 EP1802864 A1 EP 1802864A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- fuel injection
- valve seat
- injection
- bore
- 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
- 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
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/182—Discharge orifices being situated in different transversal planes with respect to valve member direction of movement
Definitions
- the invention is based on a fuel injection valve for internal combustion engines, as is known, for example, from document DE 196 42 513 A1.
- a fuel injection valve for internal combustion engines, as is known, for example, from document DE 196 42 513 A1.
- a bore is formed in a valve body, in which a valve needle is arranged to be longitudinally displaceable.
- the valve needle cooperates with a valve seat and thereby controls the fuel flow from a pressure chamber surrounding the valve needle to at least one injection port.
- Valve seat is conical, and it is formed in this region of the Kraftstoffein ⁇ injection valve at least one injection port which connects the valve seat with the combustion chamber of the internal combustion engine.
- the conical valve seat is adjoined in turn by a blind hole, from which at least one further injection opening originates.
- DE 19642 513 A1 discloses a blind-hole mold in which the inner wall of the blind hole is at least approximately hemispherical, while the outer wall of the valve body is continuously conically shaped in this area both in the region of the valve seat and in the region of the blind hole.
- Fuel injectors are often not mounted in the respective internal combustion engine in the longitudinal axis of the combustion chamber, but obliquely thereto. This makes it necessary to form the injection holes at different angles with respect to the longitudinal axis of the valve body of the valve needle, so that the fuel is still distributed evenly during the injection in the combustion chamber. This is not possible in the case of the known fuel injection valve, since the different Wall thicknesses in the individual areas of the bag hole and different injection hole lengths are generated. This considerably influences the jet formation and can only be compensated with difficulty by changing the spray hole diameter or by different rounding at the entry edges of the spray holes.
- the fuel injection valve according to the invention with the characterizing Merkma ⁇ len of claim 1 has the advantage that both in the seat hole and in the blind hole always a constant wall thickness is available, which makes a free design of the injection openings possible.
- the blind hole is shaped so that both the inner wall and the outer wall are hemispherical in shape, thus resulting in a constant wall thickness in the tip area of the blind hole.
- this embodiment offers the advantage that the wall thickness in the region of the conical valve seat and the blind hole can be adjusted independently of one another. This results in more degrees of freedom in the design of the fuel injection valve.
- the injection openings may have different angles of inclination with respect to the longitudinal axis of the bore both in the region of the blind hole and in the region of the conical valve seat, and different wall thicknesses may be provided in the blind hole and the valve seat.
- the Kraftstoffeinspritz ⁇ valve can be optimally adapted to the installation conditions in the engine. drawing
- FIG. 1 shows a longitudinal section through a fuel injection valve
- Figure 2 shows an enlarged detail of Figure 1 in the region of the valve seat.
- a fuel injection valve according to the invention is shown in longitudinal section dar ⁇ , with only the essential parts are shown.
- the Kraftstoffeinspritzven ⁇ valve has a valve body 1, in which a bore 3 is formed, which has a longitudinal axis 8 and which is limited at its combustion-chamber end of a koni see valve seat 11.
- a piston-shaped Ventil ⁇ needle 5 is arranged longitudinally displaceable, which is sealingly guided with a guide portion 15 in a valve seat facing away from region of the bore 3.
- the valve needle 5 tapers from the guide section 15 to the valve seat 11 to form a pressure shoulder 13 and merges at its valve seat side end into a valve sealing surface 7, with which the valve needle 5 interacts with the valve seat 11.
- a pressure chamber 19 is formed, which is radially expanded at the level of the pressure shoulder 13.
- an inlet channel 25 extending in the valve body 1, via which the pressure chamber 19 can be filled with fuel under high pressure.
- a blind hole 9 connects, in which the
- Valve needle 5 protrudes when it rests against the valve seat 11. From the valve seat 11, external injection openings 17 and from the blind hole 9 go from internal injection openings 27, all of which open into the combustion chamber of the internal combustion engine in the installation position of the fuel injection valve.
- valve needle 5 is acted upon at its end remote from the valve seat by a closing force, which is generated for example by a spring element and which presses the valve needle 5 against the valve seat 11.
- the closing force is counteracted by the hydraulic force on the pressure shoulder 13, which is generated by the high fuel pressure in the pressure chamber 19. If the hydraulic force on the valve needle 5 exceeds the closing force, the valve needle 5 lifts off from the valve seat 11, - A -
- FIG. 2 shows an enlarged view of FIG. 1 in the region of the valve seat 11.
- the valve sealing surface 7 of the valve needle 5 has a first conical surface 14 and a second conical surface 16, the first conical surface having a smaller opening angle than the conical valve seat 11 the second cone surface has a larger opening angle.
- a sealing edge 12 is formed at the boundary between the two conical surfaces 14, 16, with which the valve needle 5 touches the valve seat 11. Because of the high surface pressure in the region of the sealing edge 12 results in a good seal, so that the pressure chamber 19 is securely closed even at high pressure.
- the outer injection openings 17 start from the conical valve seat 11, so that the fuel has to undergo a different directional change in direction when it enters the corresponding outer injection opening 17.
- the conical valve seat 11 has a length d in which the outer wall of the valve body 1 also has a conical shape which is parallel to the conical valve seat 11, whereby a cone portion 18 of the valve body 1 is formed with a constant wall thickness D s . Since each change in direction is accompanied by a pressure loss, the effective injection pressure is increasingly reduced, the smaller the angle of inclination ⁇ 1 between the cylindrical outer injection opening 17 and the longitudinal axis 8. On the other hand, the spray hole length is greater the greater the angle of inclination a ⁇ is.
- the valve needle 5 protrudes into the blind hole 9, which adjoins the conical valve seat 11.
- the blind hole 9 in this case consists of an intermediate portion 11 and a tip portion 22.
- the intermediate portion 11 is for example cylindrical or slightly conical and can vary greatly in length. It can also be provided that the intermediate section 11 is completely eliminated as long as that
- Blind hole 9 is sufficiently deep to take auf ⁇ the entire tip of the valve needle 5.
- the dome portion 22 has a base line 23 and is internally shaped in the form of a hemisphere with radius Rj, wherein the outer wall of the Kuppen ⁇ section 22 also forms a hemisphere with a radius R a .
- the blind hole 9 in the region of the tip portion 22 has a wall thickness D ⁇ , so that all the inner injection openings 27 irrespective of their inclination angle b with respect to the longitudinal axis 8 have the same spray hole length.
- the effective injection pressure that is, the fuel pressure with which the fuel finally exits from the inner injection openings 27 and the outer Einspritzöff ⁇ 17 depends on the combination of conical valve seat 11 with the constant wall thickness D s in the cone region 18 and the blind hole 9 kuge ⁇ liger inner and outer shape in the tip region 22 at least approximately not from the angle of inclination of the respective injection openings 17, 27 with the longitudinal axis 8 of the bore 3 from.
- the inner and outer injection openings 17, 27 can therefore be arranged as desired in a wide range without impairing the quality of the injection.
- the individual injection jets retain their characteristics, that is, they have the same depth of penetration and atomize the fuel in the same way.
- the outer injection openings 17 and the inner injection openings 27 can also be arranged so that the injection jets are convergent to each other, as indicated in the embodiment shown in Figure 2.
- the injection jets can then also be designed such that they intersect either in the region of the combustion chamber wall or inside the combustion chamber.
- the wall thickness D s in the cone region of the valve body 1 and the wall thickness D 1 in the tip region of the blind hole 9 can be the same or different. Accordingly, the length of the injection openings is different and thus the penetration depth of the fuel jets in the combustion chamber.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004050048A DE102004050048A1 (de) | 2004-10-14 | 2004-10-14 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
PCT/EP2005/055025 WO2006040283A1 (de) | 2004-10-14 | 2005-10-05 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1802864A1 true EP1802864A1 (de) | 2007-07-04 |
EP1802864B1 EP1802864B1 (de) | 2010-05-05 |
Family
ID=35464028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05797092A Not-in-force EP1802864B1 (de) | 2004-10-14 | 2005-10-05 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1802864B1 (de) |
AT (1) | ATE467047T1 (de) |
DE (2) | DE102004050048A1 (de) |
WO (1) | WO2006040283A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010063355A1 (de) * | 2010-12-17 | 2012-06-21 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
JP6254122B2 (ja) * | 2015-06-24 | 2017-12-27 | 株式会社デンソー | 燃料噴射ノズル |
DE102016215637A1 (de) | 2016-08-19 | 2018-02-22 | Robert Bosch Gmbh | Kraftstoffeinspritzdüse |
DE102018209099A1 (de) | 2018-06-08 | 2019-12-12 | Robert Bosch Gmbh | Brennkraftmaschine mit adaptivem Einspritzverhalten |
DE102018209096A1 (de) | 2018-06-08 | 2019-12-12 | Robert Bosch Gmbh | Injektor und Brennkraftmaschine mit adaptivem Einspritzverhalten |
DE102018209097A1 (de) | 2018-06-08 | 2019-12-12 | Robert Bosch Gmbh | Injektor und Brennkraftmaschine mit adaptivem Einspritzverhalten |
DE102018209101A1 (de) | 2018-06-08 | 2019-12-12 | Robert Bosch Gmbh | Injektor und Brennkraftmaschine mit adaptivem Einspritzverhalten |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994027042A1 (en) * | 1993-05-07 | 1994-11-24 | Lucas Industries Public Limited Company | Fuel injection nozzles |
DE19642513A1 (de) * | 1996-10-15 | 1998-04-16 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
GB9913314D0 (en) * | 1999-06-09 | 1999-08-11 | Lucas Ind Plc | Fuel injector |
DE10207189A1 (de) * | 2001-03-03 | 2002-09-12 | Fev Motorentech Gmbh | Schaltbare Einspritzeinrichtung zur Einspritzung unterschiedlicher Kraftstoffmengen |
-
2004
- 2004-10-14 DE DE102004050048A patent/DE102004050048A1/de not_active Withdrawn
-
2005
- 2005-10-05 DE DE502005009539T patent/DE502005009539D1/de active Active
- 2005-10-05 AT AT05797092T patent/ATE467047T1/de not_active IP Right Cessation
- 2005-10-05 EP EP05797092A patent/EP1802864B1/de not_active Not-in-force
- 2005-10-05 WO PCT/EP2005/055025 patent/WO2006040283A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2006040283A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE467047T1 (de) | 2010-05-15 |
DE102004050048A1 (de) | 2006-04-27 |
DE502005009539D1 (de) | 2010-06-17 |
EP1802864B1 (de) | 2010-05-05 |
WO2006040283A1 (de) | 2006-04-20 |
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