EP1673532A1 - High pressure inlet for a common rail injector - Google Patents
High pressure inlet for a common rail injectorInfo
- Publication number
- EP1673532A1 EP1673532A1 EP04786800A EP04786800A EP1673532A1 EP 1673532 A1 EP1673532 A1 EP 1673532A1 EP 04786800 A EP04786800 A EP 04786800A EP 04786800 A EP04786800 A EP 04786800A EP 1673532 A1 EP1673532 A1 EP 1673532A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- inlet
- valve
- bores
- chamber
- 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
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 description 14
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000010276 construction Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 101150089646 Hpdl gene Proteins 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009827 uniform distribution Methods 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
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
-
- 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
- F02M55/002—Arrangement of leakage or drain conduits in or from 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
-
- 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
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
-
- 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
- F02M2200/16—Sealing of fuel injection apparatus 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/21—Fuel-injection apparatus with piezoelectric or magnetostrictive elements
-
- 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
- F02M61/165—Filtering elements specially adapted in fuel inlets to injector
Definitions
- the invention relates to a valve for controlling liquids, with a valve housing which has an actuator chamber and a laterally arranged inlet bore which is connected to a high-pressure inlet, the actuator chamber having an actuator with a plunger and an actuator cap, the actuator chamber, a Has a conical seal, which is formed by means of a conical surface at the end of the actuator space and a corresponding annular sealing surface on the actuator cap, a cable outlet being sealable with the conical seal.
- Such valves are known from EP 0 192 241.
- the injection valves in particular in the case of common rail injection systems, are provided with servo valves for controlling the fluid flows.
- So-called accumulator injection systems are used for the fuel supply of internal combustion engines, in which very high injection pressures are used.
- Such injection systems are known as common rail systems for diesel engines and HPDl injection systems for gasoline engines.
- the fuel is pumped into a high-pressure pump shared pressure accumulator, from which the injectors on the individual cylinders are supplied with fuel.
- the opening and closing of the injection valves is usually controlled electronically.
- the fuel injector has a high-pressure connection that opens laterally into the injector body.
- the amount of fuel to be injected is supplied to the injection openings via a pressure bore.
- a connection area is formed on the side of the injector body, from which an inlet bore extends, which supplies an actuator chamber with fuel under high pressure.
- a cable outlet also opens into this actuator area. So that no fuel can flow into this cable outlet, the cable outlet is sealed with a cone seal. The pressure required by the actuator cap on the cone sealing surface is achieved by the high pressure in the system.
- a disadvantage of this known prior art is that this type of construction creates an unfavorable force ratio at the intersection of the holes with the actuator space and between the cone seal. Due to the extremely high pressures - typically up to 1600 bar - the one-sided bore can act on the actuator top of the actuator with a transverse force and cause it to leak. High mechanical stresses can also arise in this intersection area.
- the actuator space has at least one additional inlet bore, which enables the force introduction to be distributed to the actuator cap and / or the plunger
- the inlet bores are arranged symmetrically around the longitudinal axis of the actuator. This has the advantage that the forces are applied evenly, which has a favorable effect on the sealing function of the cone seal and the design of the actuator.
- a particularly cost-effective variant provides that the high-pressure inlet is arranged centrally, along the central axis of the valve housing.
- the cost advantage results from the simplified manufacture of the central bore.
- the inlet bores run at an acute angle to the central axis of the valve housing. This has the advantage that the injector wall thickness increases due to the acute-angled arrangement of the inlet bores and a greater overall strength is obtained.
- the overall strength can be increased by reducing the cross sections of the inlet bores compared to the cross section of a single inlet bore. This results in a greater wall thickness of the individual inlet bores with the same amount of fuel and a larger number of inlet bores. A throttling function can also be achieved through the reduced cross-section.
- a cross-sectional widening is arranged between the inlet bores and the high-pressure inlet. This cross-sectional expansion forms and supports a high-pressure chamber thereby an even distribution of the fuel quantity over the individual inlet bores.
- a particularly cost-effective variant provides that the actuator is designed as a piezoelectric actuator unit.
- Such piezoelectric actuators are easy to use, inexpensive and maintenance-free.
- FIG. 1 shows schematically in the sectional view along the longitudinal axis a section of a valve with a high-pressure inlet for a common rail injector according to the prior art
- Figure 2 shows schematically in sectional view the high pressure inlet of the valve in an inventive embodiment
- Figure 3 shows schematically in sectional view the high pressure inlet of the valve in a further embodiment variant according to the invention.
- FIG. 1 shows a valve 1 for controlling liquids, in particular diesel fuel, which is part of a common rail injector.
- the valve 1 has a valve housing 10, in which a pressure bore runs in the longitudinal direction and forms an actuator chamber 11.
- An actuator 30 is mounted in the actuator space 11 and has a stamp 31 and an actuator cap 32.
- the actuator chamber 11 is sealed at one end by means of a cone seal to form a cable outlet 17.
- the cone seal is by means of a conical surface 14 at the end of the actuator space 11 and a corresponding annular sealing surface 33 on the actuator cap 32.
- the valve housing 10 also has a high-pressure inlet 12, which is connected to a high-pressure reservoir for liquid fuel, not shown here.
- the fuel under high pressure is supplied laterally to the actuator chamber 11 of the valve housing 10 via an inlet bore 13.
- filters 20 and / or inlet throttle elements can additionally be provided between the high-pressure inlet 12 and the inlet bore 13.
- the inlet bore 13, which runs obliquely to the longitudinal axis of the actuator chamber 11, opens laterally into the actuator chamber 11, which forms an annular cavity around the plunger 31 of the actuator 30. This cavity is constantly filled with fuel that is under extremely high pressure, typically 1600 bar and more.
- the actuator 30 can be designed as a piezoelectric actuator unit.
- the principle of operation provides that, due to electrical voltage pulses that are supplied to the actuator 30 via a cable, a valve opening is temporarily released due to changes in the length of the stamp 31 of the actuator 30, which is located at the end of the valve housing 10 opposite the conical surface 14 (not shown in the figure).
- the fuel can be injected into the combustion chamber of an internal combustion engine.
- the connection between the cable outlet 17 and the actuator 30 is realized by a bore 16 which runs obliquely to the longitudinal axis of the valve housing 10 and which forms an intersection area with a blind bore 15.
- the sealing of the actuator chamber 11 from the cable outlet 17 is of particular importance with regard to trouble-free operation. This is usually achieved by the high pressure force of the actuator cap 32 against the conical surface 14 due to the high pressure of the liquid. Due to the intersection of the bores in the inlet bore 13 with the actuator chamber 11, unfavorable force relationships can occur. In particular due to the inlet Bore 13 according to the prior art can act on the actuator cap 32 and the punch 31 of the actuator 30 transverse forces, which can lead to leaks and / or to impermissibly high voltages in the actuator 30 in the cone seal.
- the inlet bores 13 are arranged symmetrically about the longitudinal axis of the actuator 30 and ensure that the forces are introduced uniformly, which has a favorable effect on the sealing function of the cone seal and the construction of the actuator 30.
- Figure 2 shows an example of one of the preferred embodiments.
- the valve housing 10 has two opposite inlet bores 13 which open into the actuator chamber 11 in the region of the conical surface 14, outside the annular sealing surface 33 of the actuator cap 32.
- the high-pressure inlet 12 is formed centrally, along the central axis of the valve housing 10. This geometry can also ensure that the inlet bores 13 run at an acute angle to the central axis of the valve housing 10.
- a cross-sectional expansion 18 can be provided, which is located between the high-pressure inlet 12 and the inlet bores 13.
- This cross-sectional widening 18 forms a high-pressure chamber and thereby supports a uniform distribution of the fuel quantity over the individual inlet bores 13.
- the cross sections of the inlet bores 13 can be reduced compared to the cross section of an individual inlet bore 13.
- FIG. 3 shows an embodiment variant according to the invention, in which the inlet bores 13 laterally into the actuator space compared to the variant shown in FIG 11 flow into.
- the inlet bores 13 are also arranged opposite one another, which can result in a symmetrical introduction of force.
- more than two inlet bores can also be provided, which are arranged symmetrically about the longitudinal axis of the actuator 30, preferably at equal angular intervals.
- Particularly preferred exemplary embodiments have two inlet bores 13 which lie opposite one another in relation to the longitudinal axis of the actuator 30 or also three inlet bores 13 which lie in relation to the longitudinal axis. of the actuator 30 are arranged at an angle of 120 °. In particular, this achieves a construction which, on the one hand, offers advantages in manufacture and, on the other hand, avoids the disadvantages that can occur in arrangements according to the prior art.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10346243A DE10346243A1 (en) | 2003-10-06 | 2003-10-06 | High pressure feed for common rail injector for fuel control valve in internal combustion (IC) engine injection system, with valve housing containing actor chamber and lateral feed port coupled to high pressure feed, etc. |
PCT/DE2004/002081 WO2005040596A1 (en) | 2003-10-06 | 2004-09-17 | High pressure inlet for a common rail injector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1673532A1 true EP1673532A1 (en) | 2006-06-28 |
EP1673532B1 EP1673532B1 (en) | 2008-03-19 |
Family
ID=34399261
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04786800A Expired - Fee Related EP1673532B1 (en) | 2003-10-06 | 2004-09-17 | High pressure inlet for a common rail injector |
Country Status (7)
Country | Link |
---|---|
US (1) | US20070040137A1 (en) |
EP (1) | EP1673532B1 (en) |
JP (1) | JP4226034B2 (en) |
KR (1) | KR20060120001A (en) |
CN (1) | CN100476193C (en) |
DE (2) | DE10346243A1 (en) |
WO (1) | WO2005040596A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010196544A (en) * | 2009-02-24 | 2010-09-09 | Yanmar Co Ltd | Fuel injection nozzle |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0192241B1 (en) | 1985-02-19 | 1988-09-21 | Nippondenso Co., Ltd. | Control valve for controlling fluid passage |
US5025766A (en) * | 1987-08-24 | 1991-06-25 | Hitachi, Ltd. | Fuel injection valve and fuel supply system equipped therewith for internal combustion engines |
JPH03156165A (en) * | 1989-11-09 | 1991-07-04 | Yamaha Motor Co Ltd | Feeder takeout structure of high-pressure fuel injection device |
IT220661Z2 (en) * | 1990-10-31 | 1993-10-08 | Elasis Sistema Ricerca Fita Nel Mezzogiorno Soc.Consortile P.A. | IMPROVEMENTS TO THE HIGH PRESSURE SEALING SYSTEM OF THE PILOT VALVE OF AN ELECTROMAGNETIC INJECTOR FOR FUEL INJECTION SYSTEMS OF INTERNAL COMBUSTION ENGINES |
US5288025A (en) * | 1992-12-18 | 1994-02-22 | Chrysler Corporation | Fuel injector with a hydraulically cushioned valve |
US5329908A (en) * | 1993-06-08 | 1994-07-19 | Cummins Engine Company, Inc. | Compressed natural gas injection system for gaseous fueled engines |
US5553781A (en) * | 1995-01-03 | 1996-09-10 | Servojet Products International | Conversion of jerk type injector to accumulator type injector |
DE19650865A1 (en) | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | magnetic valve |
GB9925753D0 (en) * | 1999-10-29 | 1999-12-29 | Lucas Industries Ltd | Fuel injector |
ES2280318T3 (en) * | 2000-07-18 | 2007-09-16 | Delphi Technologies, Inc. | FUEL INJECTOR. |
DE10153629B4 (en) * | 2001-10-31 | 2019-10-31 | Robert Bosch Gmbh | Method of injecting fuel |
-
2003
- 2003-10-06 DE DE10346243A patent/DE10346243A1/en not_active Withdrawn
-
2004
- 2004-09-17 EP EP04786800A patent/EP1673532B1/en not_active Expired - Fee Related
- 2004-09-17 JP JP2006500506A patent/JP4226034B2/en not_active Expired - Fee Related
- 2004-09-17 KR KR1020067006543A patent/KR20060120001A/en not_active Application Discontinuation
- 2004-09-17 DE DE502004006608T patent/DE502004006608D1/en active Active
- 2004-09-17 US US10/574,659 patent/US20070040137A1/en not_active Abandoned
- 2004-09-17 WO PCT/DE2004/002081 patent/WO2005040596A1/en active IP Right Grant
- 2004-09-17 CN CNB2004800292146A patent/CN100476193C/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2005040596A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP4226034B2 (en) | 2009-02-18 |
KR20060120001A (en) | 2006-11-24 |
DE10346243A1 (en) | 2005-04-28 |
CN1864006A (en) | 2006-11-15 |
WO2005040596A1 (en) | 2005-05-06 |
DE502004006608D1 (en) | 2008-04-30 |
US20070040137A1 (en) | 2007-02-22 |
CN100476193C (en) | 2009-04-08 |
EP1673532B1 (en) | 2008-03-19 |
JP2006525458A (en) | 2006-11-09 |
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