EP1115968A1 - Common-rail-injektor - Google Patents
Common-rail-injektorInfo
- Publication number
- EP1115968A1 EP1115968A1 EP00949112A EP00949112A EP1115968A1 EP 1115968 A1 EP1115968 A1 EP 1115968A1 EP 00949112 A EP00949112 A EP 00949112A EP 00949112 A EP00949112 A EP 00949112A EP 1115968 A1 EP1115968 A1 EP 1115968A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pressure
- injector
- control piston
- closed
- 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
- 239000000446 fuel Substances 0.000 claims abstract description 52
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 239000002828 fuel tank Substances 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 229910000997 High-speed steel Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 1
- 230000007257 malfunction 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F2007/0097—Casings, e.g. crankcases or frames for large diesel engines
Definitions
- the invention relates to a common rail injector for injecting fuel into a common rail.
- Injection system in an internal combustion engine in particular a large diesel internal combustion engine, with an injector housing, which is connected via a fuel inlet to a central high-pressure accumulator, which comes from a fuel tank via a high-pressure pump
- Fuel is supplied which, depending on the position of a 3/2-way solenoid valve integrated in the injector housing, passes from the high-pressure accumulator into a high-pressure bore of an injection nozzle which is integrated in the injector housing and comprises a nozzle needle which axially counteracts the pretensioning force of a nozzle spring is displaceable, which is received in a nozzle spring chamber, the 3/2-way solenoid valve having a reciprocating control piston between a closed and an open valve position, which is coupled at one of its two ends to an armature and the other end protrudes into an unpressurized space, the fuel inlet being connected to the high-pressure bore of the injection nozzle in the open valve position, and the
- Fuel supply is closed by the control piston and the high pressure bore of the injection nozzle with a Fuel drain and the unpressurized space in connection.
- Such an injector is known from DE 43 41 543.
- a high-pressure pump delivers the fuel to the central high-pressure accumulator, which is referred to as the common rail.
- High-pressure lines lead from the high-pressure accumulator to the individual injectors, which are assigned to the engine cylinders.
- the injectors are individually controlled by the engine electronics.
- the rail pressure is applied to the 3/2-way solenoid valve, which keeps the high-pressure bores to the conventional injection nozzle depressurized.
- the solenoid When the solenoid is energized, the 3/2-way solenoid valve opens the connection from the rail to the injection nozzle, and the
- Fuel passes the nozzle needle, raised against the force of a valve spring, into the combustion chamber.
- Spray start and spray end are determined by the start and end of the energization of the magnet. The duration of energization is decisive for the injection quantity.
- the phase in which the control piston is between the open and the closed valve position is referred to as the flight phase.
- instabilities in the movement of the control piston were found at high injection pressures of approximately 1,500 bar in the flight phase. These instabilities occurred in particular when the current supply to the magnet was varied at a constant speed. The instabilities can cause the internal combustion engine to no longer work correctly in the area concerned.
- the object of the invention is to optimize the movement of the control piston in the flight phase.
- the invention relates to a common rail injector for injecting fuel into a common rail.
- Injection system in an internal combustion engine in particular a large diesel internal combustion engine, with an injector housing, which is connected via a fuel inlet to a central high-pressure accumulator, which comes from a fuel tank via a high-pressure pump
- Fuel is supplied which, depending on the position of a 3/2-way solenoid valve integrated in the injector housing, passes from the high-pressure accumulator into a high-pressure bore of an injection nozzle which is integrated in the injector housing and comprises a nozzle needle which axially against the biasing force of a nozzle spring is displaceable, which is received in a nozzle spring chamber, the 3/2-way solenoid valve having a reciprocating control piston between a closed and an open valve position, which is coupled at one of its two ends to an armature and the other end protrudes into an unpressurized space, the fuel inlet being connected to the high-pressure bore of the injection nozzle in the open valve position, and the
- Fuel inlet is closed by the control piston and the high pressure bore of the injection nozzle is connected to a fuel outlet and the unpressurized space, solved in that a first throttle point is arranged between the high pressure bore and the fuel outlet.
- a first throttle point is arranged between the high pressure bore and the fuel outlet.
- the second throttle point prevents fuel under pressure from entering the unpressurized space during the flight phase.
- the inflow of pressurized fuel into the unpressurized space could otherwise lead to pressure pulses on the end face of the control piston. These pressure pulses would counteract the valve spring force and could lead to a malfunction of the 3/2 way solenoid valve.
- Another special embodiment of the invention is characterized in that a sleeve for guiding the control piston is inserted into the injector housing.
- the sleeve can either be with or without already mounted
- Control pistons are installed in the injector housing.
- the use of the sleeve has the advantage that it can be processed much more easily in production than the injector housing.
- a worn sleeve can easily be replaced with a new sleeve. It is no longer necessary to replace the injector housing.
- a further special embodiment of the invention is characterized in that in the sleeve in the area of the fuel inlet, the fuel outlet and the connection to the high-pressure bore, an opening is left in each case, which opens into an annular space. This ensures a good distribution of the fuel.
- Another special embodiment of the invention is characterized in that the sleeve is formed from a high-speed steel with a higher hardness than the injector housing. This significantly increases the life of the injector.
- Another special embodiment of the invention is characterized in that the diameter play at the throttling points is 0.005 to 0.05 mm. These values have proven to be particularly advantageous in the investigations carried out within the scope of the present invention.
- FIG. 1 shows the view of a longitudinal section through a first embodiment of an injector according to the invention
- FIG. 2 shows an enlarged detail from FIG. 1;
- Figure 3 shows a section of a second
- Embodiment of an injector according to the invention Embodiment of an injector according to the invention.
- an injector according to the invention is generally designated 1.
- the injector 1 comprises an injector housing 2.
- a fuel inlet 3 reaches high-pressure fuel into the interior of the injector housing 2.
- the high pressure bore 5 leads to a Injection nozzle 6.
- the injection nozzle 6 comprises a nozzle needle 7, which is pressed by a nozzle spring 8 against a nozzle needle seat.
- the nozzle spring 8 is arranged in a nozzle spring chamber 9, which is depressurized.
- the fuel that accumulates in operation in the nozzle spring chamber 9 is discharged via a fuel channel 10 and a throttle 11.
- the 3/2-way solenoid valve 4 comprises a magnet 13 to reciprocate a control piston 14 against the biasing force of a valve spring 16.
- the control piston 14 is coupled to an armature 15 which interacts with the magnets 13.
- control piston 14 is received in a bore 18 in the injector housing 2.
- a sleeve 19 is arranged between the control piston 14 and the injector housing 2. The sleeve 19 is shrunk into the injector housing 2 and is used for the axial
- a first annular space is left in the sleeve 19.
- the inside diameter of the sleeve 19 is dimensioned differently on the two sides of the first annular space 20.
- the inside diameter of the sleeve 19 is larger than on the side of the first annular space 20 facing away from the valve spring 16.
- a first conical seat 22 is formed between the first annular space 20 and the section 21.
- a second annular space 23 follows section 21.
- the second annular space 23 is located with the high-pressure bore 5 in
- a section follows the second annular space 23 24 of the sleeve 19 with the same inner diameter as on the side of the sleeve 19 facing the first annular space 20 towards the valve spring 16.
- a bushing 26 is plugged onto the free end of the control piston 14 and fastened with the aid of a nut 25.
- a first throttle point 27 is formed between the bushing 26 and the section 24 of the sleeve 19. In terms of production technology and assembly effort, it is cheaper to integrate the nut or the thread into the bushing. Then the bushing 26 can be screwed onto the control piston 14 and the nut 25 is omitted.
- the first throttle point 27 is followed by a third annular space 28 in the area of the fuel outlet 12.
- a second throttle point 29 is formed between the third annular space 28 and the unpressurized nozzle spring space 9.
- FIG. 3 shows a section of an injector, designated overall by 31.
- a fuel inlet 3 is arranged in an injector housing 2 in the longitudinal direction of the injector housing 2.
- the fuel inlet 3 is closed or is connected to a high-pressure bore 5.
- the high-pressure bore 5 leads to an injection nozzle (not shown in FIG. 3).
- the high-pressure bore 5 is connected to a fuel outlet 12.
- the 3/2-way valve 4 comprises a magnet 13, which a control piston 14 using an armature 15 against the biasing force of a
- Valve spring 16 actuated. As long as the magnet 13 is not energized, the valve spring 16 ensures that the fuel inlet 3 remains closed.
- a sleeve 19 is shrunk.
- the sleeve 19 has the same function as in the embodiment previously described with reference to FIGS. 1 and 2.
- a first cone seat 22 is closed.
- the control piston 14 moves against the biasing force of the valve spring 16 towards the magnet 13.
- the first cone seat 22 opens.
- the movement of the control piston 14 continues until a second cone seat 17 closes.
- a throttle point 27 is formed between the high-pressure bore 5 and the second cone seat 17.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19928846A DE19928846A1 (de) | 1999-06-24 | 1999-06-24 | Common-Rail-Injektor |
DE19928846 | 1999-06-24 | ||
PCT/DE2000/001975 WO2001000980A1 (de) | 1999-06-24 | 2000-06-23 | Common-rail-injektor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1115968A1 true EP1115968A1 (de) | 2001-07-18 |
EP1115968B1 EP1115968B1 (de) | 2004-10-13 |
Family
ID=7912315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00949112A Expired - Lifetime EP1115968B1 (de) | 1999-06-24 | 2000-06-23 | Common-rail-injektor |
Country Status (5)
Country | Link |
---|---|
US (1) | US6565013B1 (de) |
EP (1) | EP1115968B1 (de) |
JP (1) | JP2003503625A (de) |
DE (2) | DE19928846A1 (de) |
WO (1) | WO2001000980A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10103089A1 (de) * | 2001-01-24 | 2002-08-08 | Bosch Gmbh Robert | 3/2-Wegeventil |
US7278593B2 (en) * | 2002-09-25 | 2007-10-09 | Caterpillar Inc. | Common rail fuel injector |
RU2391341C2 (ru) | 2002-09-25 | 2010-06-10 | Мемори Фармасьютиклз Корпорейшн | Индазолы, бензотиазолы, бензоизотиазолы, их получение и применение |
EP1621764B1 (de) * | 2004-06-30 | 2007-11-07 | C.R.F. Società Consortile per Azioni | Einspritzventil einer Brennkraftmaschine |
EP3483420B1 (de) * | 2017-11-13 | 2020-06-17 | Winterthur Gas & Diesel AG | Brennstoffeinspritzdüse und brennstoffeinspritzverfahren für einen grossdieselmotor, sowie grossdieselmotor |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4164326A (en) * | 1978-04-06 | 1979-08-14 | General Motors Corporation | Electromagnetic fuel injector nozzle assembly |
JPS5655769U (de) * | 1979-10-05 | 1981-05-14 | ||
DE3743532A1 (de) * | 1987-12-22 | 1989-07-06 | Bosch Gmbh Robert | Kraftstoffeinspritzanlage fuer brennkraftmaschinen |
DE4029159A1 (de) * | 1990-01-03 | 1991-07-04 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung fuer einspritzbrennkraftmaschinen |
US5397055A (en) * | 1991-11-01 | 1995-03-14 | Paul; Marius A. | Fuel injector system |
DE4341543A1 (de) * | 1993-12-07 | 1995-06-08 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
DE4341546A1 (de) * | 1993-12-07 | 1995-06-08 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
DE19701879A1 (de) * | 1997-01-21 | 1998-07-23 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen |
DE29717649U1 (de) * | 1997-10-02 | 1997-11-20 | Fev Motorentech Gmbh & Co Kg | Direktgesteuertes Einspritzventil, insbesondere Kraftstoffeinspritzventil |
-
1999
- 1999-06-24 DE DE19928846A patent/DE19928846A1/de not_active Ceased
-
2000
- 2000-06-23 WO PCT/DE2000/001975 patent/WO2001000980A1/de active IP Right Grant
- 2000-06-23 EP EP00949112A patent/EP1115968B1/de not_active Expired - Lifetime
- 2000-06-23 US US09/763,479 patent/US6565013B1/en not_active Expired - Fee Related
- 2000-06-23 JP JP2001506369A patent/JP2003503625A/ja active Pending
- 2000-06-23 DE DE2000508219 patent/DE50008219D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0100980A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50008219D1 (en) | 2004-11-18 |
WO2001000980A8 (de) | 2001-03-29 |
US6565013B1 (en) | 2003-05-20 |
EP1115968B1 (de) | 2004-10-13 |
JP2003503625A (ja) | 2003-01-28 |
WO2001000980A1 (de) | 2001-01-04 |
DE19928846A1 (de) | 2001-03-08 |
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