EP0548066A1 - Fuel injection nozzle for internal combustion engines. - Google Patents
Fuel injection nozzle for internal combustion engines.Info
- Publication number
- EP0548066A1 EP0548066A1 EP89911533A EP89911533A EP0548066A1 EP 0548066 A1 EP0548066 A1 EP 0548066A1 EP 89911533 A EP89911533 A EP 89911533A EP 89911533 A EP89911533 A EP 89911533A EP 0548066 A1 EP0548066 A1 EP 0548066A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bore
- diameter
- filter
- fuel channel
- fuel
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/008—Arrangement of fuel passages inside of injectors
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
Definitions
- the invention relates to a fuel injection nozzle according to the preamble of the main claim.
- the filter bore opens directly into the fuel channel, a sharp-edged, long-life-sensitive edge cutting edge forming at the transition of the bores, which has to be removed electrolytically in an additional operation.
- the transition region of the bores because of the small distance of the fuel channel from the circumference of the nozzle holder, there is a point with further reduced wall thickness and reduced pressure threshold strength.
- the arrangement according to the invention with the characterizing features of the main claim has the advantage that the formation of a sharp-edged sandblade is avoided at the transition of the connecting hole in the fuel channel, so that an additional. Production-technically difficult to control operation to eliminate them is eliminated.
- the wall thickness in the transition region of the bores is weakened less than in the known embodiment, so that the injection nozzle can also be designed for significantly higher fuel pressures above 800 bar.
- FIG. 1 shows an injection nozzle of the generic type, partly in longitudinal section and partly in side view
- FIG. 2 shows the area “Z” in FIG. 1, on an enlarged scale compared to FIG. 1
- FIG. 3 shows a partial section through the exemplary embodiment of the invention in one of the Figure 2 corresponding scale.
- the generic injection nozzle according to FIG. 1 has a nozzle body 10 which, together with an intermediate disk 12, is fastened to a nozzle holder 16 by means of a clamping nut 14.
- the intermediate disc 12 serves as a stroke stop for a valve needle 18, which is pressed by a closing spring 20 via a pressure piece 22 against a valve seat in the nozzle body 10.
- the closing spring 20 is in a chamber 22 arranged in the nozzle holder 16 and is supported on the bottom 24 of the chamber 22.
- the chamber 22 is connected via a leak oil channel 26 to a leak oil connection on the nozzle holder 16 which is not visible in the drawing.
- a pressure chamber which is not visible and surrounds the valve needle 18, is formed, in which the valve needle 18 has a pressure shoulder and which has bores 28 and 30 in the nozzle body 10 and the intermediate disk 12 with a fuel channel 32 in the nozzle holder 16 connected, which extends next to the chamber 22 and parallel to it through the nozzle holder 16 up to a filter bore 34 of larger diameter, which contains a rod-shaped filter body 36 and is oriented obliquely to the nozzle axis into a connecting piece 38 for a fuel feed line leads.
- the filter bore 34 is produced with the aid of a deep hole drill, the only cutting lip of which in the full material produces a W-shaped cutting profile, which is shown in more detail in FIG.
- the sectional profile has two inner W-legs 40, to which two outer W-legs 42 connect.
- the transition between the outer W-legs 42 and the bore wall 44 of the filter bore 34 can have further inclined sections 46 and 48 by means of corresponding cuts on the deep hole drill.
- a connecting bore 52 is provided between the filter bore 34 and the fuel channel 32 and is arranged coaxially with the filter bore 34, the diameter of which is smaller than the diameter of the filter bore 34 and larger than the diameter of the fuel channel 32 is.
- the connecting bore 52 is also made with a deep hole drill and consequently also has a W-shaped cutting profile with two external W-legs 56.
- the diameter of the connecting bore 52 or the cutting profile is thus based on the diameter of the fuel channel rank ⁇ 32 is true that the duct wall 58, the sectional profile of the kaus ⁇ bore "52 cuts into exclusively in the region of the outer W-legs 56th the inner W-legs omitted and the forming the transition between the two bores peripheral edge 60 has over its entire circumference away an edge angle of over 90 °, so that the risk of fatigue fracture is significantly reduced and an additional step for tiling the edge is not necessary.
- the diameter of the connecting bore 52 is also dimensioned such that its bore wall 62 also cuts the filter bore 34 only in the area of the outer W-leg 42 of its sectional profile, so that there is also no post-treatment of the resulting edge edge 64 there.
- Another advantage of the arrangement according to the invention is that the smallest wall thickness s resulting in the transition region of the bores is larger. than in the prior art, which also gives the injector a higher pressure threshold strength.
- the connecting bore 52 could also be produced together with the filter bore 34 by a correspondingly shaped deep hole drill in one operation.
Abstract
Des injecteurs de ce type présentent un épaulement (50) anguleux néfaste au niveau de la transition entre l'alésage de filtre (34) et le canal de carburant (32), ce qui peut provoquer une rupture par fatigue et doit être éliminé par voie électrolytique au cours d'une opération supplémentaire. L'invention rend superflue cette opération supplémentaire de finition techniquement compliquée. A cet effet, un alésage de raccordement (52) est percé entre l'alésage de filtre (34) et le canal de carburant (32) à l'aide d'un foret long, et adapté au diamètre du canal de carburant (32) de sorte que la paroi (58) du canal coupe le profil de section de l'alésage de raccordement (52) uniquement dans la région du côté externe du W (56). Domaine d'application préféré: moteurs diesel.Injectors of this type have a detrimental angular shoulder (50) at the transition between the filter bore (34) and the fuel channel (32), which can cause fatigue failure and must be removed by road. electrolytic during an additional operation. The invention makes this additional technically complicated finishing operation superfluous. For this purpose, a connection bore (52) is drilled between the filter bore (34) and the fuel channel (32) using a long drill, and adapted to the diameter of the fuel channel (32 ) so that the channel wall (58) intersects the section profile of the connecting bore (52) only in the region of the outer side of the W (56). Preferred area of application: diesel engines.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3839635A DE3839635A1 (en) | 1988-11-24 | 1988-11-24 | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
DE3839635 | 1988-11-24 | ||
PCT/DE1989/000666 WO1990005846A1 (en) | 1988-11-24 | 1989-10-19 | Fuel injection nozzle for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0548066A1 true EP0548066A1 (en) | 1993-06-30 |
EP0548066B1 EP0548066B1 (en) | 1994-05-11 |
Family
ID=6367782
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89911533A Expired - Lifetime EP0548066B1 (en) | 1988-11-24 | 1989-10-19 | Fuel injection nozzle for internal combustion engines |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0548066B1 (en) |
JP (1) | JP2779029B2 (en) |
DE (2) | DE3839635A1 (en) |
WO (1) | WO1990005846A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19808611A1 (en) * | 1998-02-28 | 1999-09-02 | Bosch Gmbh Robert | Method of making an angled hole in a component |
DE10017657A1 (en) * | 2000-04-08 | 2001-10-11 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
JP2010196544A (en) * | 2009-02-24 | 2010-09-09 | Yanmar Co Ltd | Fuel injection nozzle |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2119973A1 (en) * | 1971-04-23 | 1972-11-16 | Robert Bosch Gmbh, 7000 Stuttgart | Fuel injector |
DE2303506A1 (en) * | 1973-01-25 | 1974-08-01 | Bosch Gmbh Robert | FUEL INJECTION NOZZLE FOR COMBUSTION MACHINES |
DE3205669A1 (en) * | 1982-02-17 | 1982-12-30 | Daimler-Benz Ag, 7000 Stuttgart | Fuel injection valve for diesel engines |
DE8213190U1 (en) * | 1982-05-07 | 1983-10-27 | Robert Bosch Gmbh, 7000 Stuttgart | FUEL INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES |
-
1988
- 1988-11-24 DE DE3839635A patent/DE3839635A1/en not_active Ceased
-
1989
- 1989-10-19 WO PCT/DE1989/000666 patent/WO1990005846A1/en active IP Right Grant
- 1989-10-19 EP EP89911533A patent/EP0548066B1/en not_active Expired - Lifetime
- 1989-10-19 DE DE58907659T patent/DE58907659D1/en not_active Expired - Fee Related
- 1989-10-19 JP JP1510759A patent/JP2779029B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9005846A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1990005846A1 (en) | 1990-05-31 |
DE3839635A1 (en) | 1990-05-31 |
JPH04501900A (en) | 1992-04-02 |
JP2779029B2 (en) | 1998-07-23 |
DE58907659D1 (en) | 1994-06-16 |
EP0548066B1 (en) | 1994-05-11 |
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