EP0817915B1 - Kraftstoffeinspritzventil für brennkraftmaschinen - Google Patents
Kraftstoffeinspritzventil für brennkraftmaschinen Download PDFInfo
- Publication number
- EP0817915B1 EP0817915B1 EP96942256A EP96942256A EP0817915B1 EP 0817915 B1 EP0817915 B1 EP 0817915B1 EP 96942256 A EP96942256 A EP 96942256A EP 96942256 A EP96942256 A EP 96942256A EP 0817915 B1 EP0817915 B1 EP 0817915B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- injection
- fuel
- bore
- head
- 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 - Lifetime
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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
- F02M61/08—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 opening in direction of fuel flow
-
- 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
- F02M61/042—The valves being provided with fuel passages
- F02M61/045—The valves being provided 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
- 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
Definitions
- the invention relates to a fuel injection valve for Internal combustion engines according to the preamble of claim 1.
- a fuel injection valve known from WO 93/25814 A.
- the valve member points protruding from the bore of the valve body on its combustion chamber side End of a valve head, whose head is immersed in the bore, annular end face facing away from the combustion chamber delimits a pressure chamber, which can be acted upon by the high pressure fuel. there shifts the high pressure fuel acting on the pressure chamber the valve member against the restoring force of a valve spring to the outside in an opening stroke position.
- an injection channel is provided, starting from the pressure chamber into an outlet opening on the peripheral wall of the valve head flows into the valve member in the closed position of the valve body is closed and in the open stroke position of the valve member overlaps with the bore wall of the valve body, so that the fuel from the pressure chamber for injection into the Combustion chamber of the internal combustion engine to be supplied arrives.
- the opening of the injection channel appears during the opening stroke movement not completely out of the hole so that the fuel jet on a control edge receives an inhomogeneous speed distribution.
- the injection channel is to the longitudinal axis of the valve member trained inclined.
- the fuel injection valve according to the invention for internal combustion engines with the characterizing features of claim 1 has the advantage that the injected Fuel flow due to the longitudinal axis of the valve member rectangular position of the injection channel is deflected more and so the injection jet generated has a short penetration depth and has high atomization quality, so that it is small for combustion chambers Diameter and small stroke volume is well suited.
- Fuel injection valve for internal combustion engines is in shown in the drawing and in the following Description explained in more detail.
- Figure 1 shows a longitudinal section through the Fuel injector in maximum Valve member opening stroke position
- Figure 2 is an enlarged Section of Figure 1 in the area of the valve member head
- Figure 3 is an enlarged view of the Injection cross section and the jet course of the Injection jet.
- the fuel injector shown in Figure 1 for internal combustion engines has a valve body 1 which by means of a union nut 3 on a valve holding body 5 is clamped.
- a piston-shaped valve member 9 guided axially displaceably, that at its lower, in the combustion chamber of the one to be supplied Internal combustion engine projecting end as a closing head acting valve head 11.
- the one in FIG Valve head 11 shown enlarged has a Valve body 1 facing conical valve sealing surface 13, which in the exemplary embodiment by an annular end face on the valve head 11 seat ring 15 is formed and the one with a correspondingly conical design Valve seat 17 on the end face of the combustion chamber Valve body 1 interacts.
- the in a diameter enlarged bore portion 19 of the Bore 7 of the valve body 1 projecting section of the Valve head 11 is designed as a spool, which in Bore part 19 is guided and with its the combustion chamber facing away from the end face 21 a pressure chamber 23 in Valve body 1 limited.
- This pressure chamber 23 is one Annular gap 25 between the shaft 27 of the valve member 9 and the wall of the bore 7 connected to a collecting space 29, in the one the valve body 1 and the Valve holder body 5 penetrating inlet line 31 opens, which can be connected to a fuel injection pump, via the pressure chamber 23 alternately with high fuel pressure is applied.
- valve spring 33 for an axial application of force to the valve member 9 in Closing direction, is a valve spring 33 in a spring chamber 35 used in the valve holding body 5, which over a Ring insert 37 and a slotted stop ring 39 on the End face of the valve body facing away from the combustion chamber 1 supports and the one at the end facing away from the combustion chamber Valve member 9 arranged retaining ring 41 and one Adjustment disk 43 acts on the valve member 9.
- valve head 11 of the Valve element 9 For the injection of fuel under high pressure in the combustion chamber, not shown, to supplying internal combustion engine is in the valve head 11 of the Valve element 9 at least one (three in the exemplary embodiment) injection channel 47 leading away from pressure chamber 23, the one on the peripheral wall of the valve head 11 Exit cross section 49 forms which is arranged such that he completely of when the valve member 9 is in the closed position the bore wall 19 of the valve body 1 is covered and with the outward opening stroke of the valve member 9 from a lower, at the combustion chamber end of the Valve body 1 arranged control edge 51 turned open becomes. This is shown enlarged in Figures 2 and 3 Control edge 51 on the valve body 1 is through the Ring edge between the valve seat 17 and the wall of the Bore 19 formed in the valve body 1.
- the injection channel 47 in the valve head 11 is through one of the upper ring end face 21 of the valve head 11 outgoing Inlet bore 53 inclined to the valve member axis is arranged, and a radially leading away from this Injection bore 55 formed on the other hand to the Circumferential wall of the valve head 11 opens and there the Exit cross section 49 forms.
- the runs Injection bore 55 perpendicular to the valve member axis and has a rectangular cross-sectional shape.
- the axial extent of the outlet opening on Outlet cross section 49 is dimensioned so that the Valve sealing surface 13 on the support ring 15 a certain axial distance to the lower edge of the combustion chamber Has outlet cross section 49.
- the fuel injection valve according to the invention works in following way.
- valve spring 33 keeps the valve member 9 with its valve sealing surface 13 in contact with the Valve seat 17 on the valve body 1, the Exit cross section 49 of the injection channel 47 in this Closing position completely from the bore wall of the Valve body 1 is closed.
- the pumped by the high pressure injection pump gets under high pressure fuel via the feed line 31, the collecting space 29 and the annular gap 25 into the pressure space 23.
- the high fuel pressure acts on the end face of the ring 21 and thus moves the valve member 9 against Restoring force of the valve spring 33 from the valve seat 17 the outlet cross section 49 of the injection channel 47 is immersed after going through a short advance stroke from the overlap with the bore wall of the valve body 1, so that the Exit cross-section 49 from the control edge 51 of the Valve body 1 is opened and the fuel for Injection into the combustion chamber of the internal combustion engine reached.
- the outlet cross section 49 will generate the injection jet only partially shown as enlarged in FIG. 3, up to a maximum of 50%. This takes place Pressure conversion of the injection jet always on the Control edge 51, so that the effect of an extremely short Spray hole length occurs. Due to the right-angled position of the Injection holes 55 to the valve member axis is the Beam deflection of 15 ° at the control edge 51 so held that over the evenly distributed several Exit cross sections 49 a beam cone angle ⁇ of about 150 ° arises.
- the exit cross section 49 is first (Spray opening) again from the valve body wall closed before the valve member 9 with its Valve sealing surface 13 abuts the valve seat 17 so that Contamination and corrosion of the outlet cross section can be avoided.
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 (8)
- Kraftstoffeinspritzventil für Brennkraftmaschinen mit einem in einer Bohrung (7) eines Ventilkörpers (1) vom Kraftstoffdruck entgegen der Rückstellkraft einer Ventilfeder (33) axial verschiebbaren Ventilglied (9) mit einem kolbenförmigen Ventilkopf (11), in dem wenigstens ein von einem in der Bohrung (7) begrenzten Druckraum (23) abführender Einspritzkanal (47) vorgesehen ist, dessen Austrittsquerschnitt (49) an der Umfangsfläche des Ventilkopfes (11) in Schließstellung des Ventilgliedes (9) vollständig vom Ventilkörper (1) überdeckt und beim nach außen gerichteten Öffnungshub von einer unteren Steuerkante (51) am brennraumseitigen Ende des Ventilkörpers (1) aufgesteuert wird, so daß die an die Steuerkante (51) angrenzende Bohrungswand des Ventilkörpers (1) bei maximaler Öffnungshublage des Ventilgliedes (9) einen Teil des Austrittsquerschnittes (49) des Einspritzkanals (47) an der Wand des Ventilkopfes (11) überdeckt, dadurch gekennzeichnet, daß die Einspritzbohrung (55) rechtwinklig zur Achse des Ventilgliedes (9) angeordnet ist.
- Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die Steuerkante (51) am brennraumseitigen Ende des Ventilkörpers (1) bei maximaler Öffnungshublage des Ventilgliedes (9) maximal 50% des Austrittsquerschnitts (49) des Einspritzkanals (47) freigibt.
- Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß der Einspritzkanal (47) durch eine von einer oberen, dem Brennraum abgewandte Ringstirnfläche (21) des Ventilkopfes (11) ausgehende Zulaufbohrung (53) und eine radial von dieser abführenden Einspritzbohrung (55) gebildet ist, die andererseits an die Umfangswand des Ventilkopfes (11) mündet und dort den Austrittsquerschnitt (49) bildet.
- Kraftstoffeinspritzventil nach Anspruch 3, dadurch gekennzeichnet, daß der Querschnitt der Einspritzbohrung (55) eine Rechteckform aufweist.
- Kraftstoffeinspritzventil nach Anspruch 3, dadurch gekennzeichnet, daß die dem Brennraum abgewandte Ringstirnfläche (21) des Ventilkopfes (11) den Druckraum (23) in der Bohrung (19) des Ventilkörpers (1) begrenzt.
- Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß eine Vielzahl von Einspritzkanälen (47), vorzugsweise drei, vorgesehen sind, die gleichmäßig über den Umfang des Ventilkopfes (11) verteilt angeordnet sind.
- Kraftstoffeinspritzventil nach Anspruch 1, dadurch gekennzeichnet, daß die brennraumseitige Stirnfläche des Ventilkörpers eine Ventilsitzfläche (17) bildet, mit der eine Ventildichtfläche (13) zusammenwirkt, die durch eine brennraumabgewandte Ringstirnfläche eines auf den Ventilkopf (11) aufgesetzten Sitzringes (15) gebildet wird.
- Kraftstoffeinspritzventil nach Anspruch 8, dadurch gekennzeichnet, daß die Ventildichtfläche (13) am Ventilkopf (11) mit axialem Abstand zur unteren, dem Brennraum zugewandten Kante (57) der Austrittsöffnung (49) des Einspritzkanals (47) angeordnet ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19602615A DE19602615A1 (de) | 1996-01-25 | 1996-01-25 | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19602615 | 1996-01-25 | ||
PCT/DE1996/001875 WO1997027397A1 (de) | 1996-01-25 | 1996-09-26 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0817915A1 EP0817915A1 (de) | 1998-01-14 |
EP0817915B1 true EP0817915B1 (de) | 2001-12-19 |
Family
ID=7783646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96942256A Expired - Lifetime EP0817915B1 (de) | 1996-01-25 | 1996-09-26 | Kraftstoffeinspritzventil für brennkraftmaschinen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0817915B1 (de) |
JP (1) | JPH11502587A (de) |
KR (1) | KR19980703221A (de) |
DE (2) | DE19602615A1 (de) |
WO (1) | WO1997027397A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19642440A1 (de) * | 1996-10-15 | 1998-04-16 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE19941930A1 (de) | 1999-09-03 | 2001-03-15 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5522550A (en) * | 1992-06-10 | 1996-06-04 | Robert Bosch Gmbh | Injection nozzle for internal combustion engines |
DE4310154A1 (de) * | 1993-03-29 | 1994-10-06 | Bosch Gmbh Robert | Kraftstoff-Einspritzdüse für Brennkraftmaschinen |
DE4340883A1 (de) * | 1993-12-01 | 1995-06-08 | Bosch Gmbh Robert | Kraftstoff-Einspritzdüse für Brennkraftmaschinen |
-
1996
- 1996-01-25 DE DE19602615A patent/DE19602615A1/de not_active Withdrawn
- 1996-09-26 WO PCT/DE1996/001875 patent/WO1997027397A1/de not_active Application Discontinuation
- 1996-09-26 EP EP96942256A patent/EP0817915B1/de not_active Expired - Lifetime
- 1996-09-26 JP JP9526396A patent/JPH11502587A/ja active Pending
- 1996-09-26 DE DE59608504T patent/DE59608504D1/de not_active Expired - Fee Related
- 1996-09-26 KR KR1019970706625A patent/KR19980703221A/ko not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
KR19980703221A (ko) | 1998-10-15 |
JPH11502587A (ja) | 1999-03-02 |
WO1997027397A1 (de) | 1997-07-31 |
DE19602615A1 (de) | 1997-07-31 |
EP0817915A1 (de) | 1998-01-14 |
DE59608504D1 (de) | 2002-01-31 |
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