EP1114247B1 - Common-rail-injektor - Google Patents

Common-rail-injektor Download PDF

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Publication number
EP1114247B1
EP1114247B1 EP00949125A EP00949125A EP1114247B1 EP 1114247 B1 EP1114247 B1 EP 1114247B1 EP 00949125 A EP00949125 A EP 00949125A EP 00949125 A EP00949125 A EP 00949125A EP 1114247 B1 EP1114247 B1 EP 1114247B1
Authority
EP
European Patent Office
Prior art keywords
common
pressure
fuel
space
nozzle needle
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
Application number
EP00949125A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1114247A1 (de
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1114247A1 publication Critical patent/EP1114247A1/de
Application granted granted Critical
Publication of EP1114247B1 publication Critical patent/EP1114247B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the invention relates to a common rail injector Fuel injection in a common rail injection system an internal combustion engine, the one Injector housing having a fuel inlet that with a central high-pressure fuel storage outside of the injector housing and with a pressure chamber inside the Injector housing communicates from the high pressure fuel applied depending on the position a control valve is injected, which ensures that one in a longitudinal bore in the injector housing axially back and forth against the biasing force of a nozzle spring Movable nozzle needle lifts off a seat when the pressure is on in the pressure chamber is greater than the pressure in a control room is that via an inlet throttle with the fuel inlet and that via a discharge throttle with a relief chamber is connectable.
  • a common rail which is referred to as a common rail.
  • individual injectors assigned to the engine cylinders are.
  • the injectors are individually engine electronics driven.
  • the rail pressure is in the pressure chamber and the control valve. When the control valve opens, the Nozzle needle from its seat, and with high pressure acted fuel is in the combustion chamber of the Internal combustion engine injected.
  • the control room is on Combustion chamber distal end of the longitudinal bore centrally in the Injector housing arranged.
  • the connection between the Fuel inlet and the pressure chamber is through a bore made outside the longitudinal bore. This extra hole in the injector housing is at least during the injection, with the full one Rail pressure applied. That is why the sealing of the Injector housing is technically very complex to manufacture.
  • the object of the invention is a common rail injector to provide the type described above, the simple is constructed and inexpensive to manufacture. In particular the tightness should be improved.
  • the task is for a common rail injector Fuel injection in a common rail injection system an internal combustion engine, the one Injector housing having a fuel inlet that with a central high-pressure fuel storage outside of the injector housing and with a pressure chamber inside the Injector housing communicates from the high pressure fuel applied depending on the position a control valve is injected, which ensures that one in a longitudinal bore in the injector housing axially back and forth against the biasing force of a nozzle spring Movable nozzle needle lifts off a seat when the pressure is on in the pressure chamber is greater than the pressure in a control room is that via an inlet throttle with the fuel inlet and that via a discharge throttle with a relief chamber is connectable, in that the connection between the fuel inlet and the pressure chamber relative to the control room is arranged inside.
  • the structure of the the injector according to the invention is practically the reverse compared to conventional injectors. Through this Measure is the high pressure seal of the injector housing considerably simplified in terms of production technology.
  • the nozzle needle has a central bore has, via which the fuel supply to the pressure chamber connected is.
  • the hole in the nozzle needle has the same function as the hole in the injector housing conventional injectors.
  • Another special embodiment of the invention is characterized in that on the nozzle needle between the Fuel inlet and the pressure chamber at least one level Surface is formed, past the fuel from the Fuel supply can get into the pressure chamber.
  • Another special embodiment of the invention is characterized in that it is the central Hole is an axial blind hole, the end through at least one radial bore with the pressure chamber in Connection is established. If four radial holes are in a star shape from the blind bore will run out at high pressure pressurized fuel evenly in the annular Distributed pressure room.
  • Another special embodiment of the invention is characterized in that the control room between the inner peripheral surface of the longitudinal bore and the outer Circumferential surface of a sleeve is arranged under Sealing effect at the end of the nozzle needle remote from the combustion chamber is displaceable and with the help of the nozzle spring in system the injector housing is held.
  • Another special embodiment of the invention is characterized in that on the surface of the sleeve, the is in contact with the injector housing, one Bite edge is formed. This ensures that the control chamber formed outside of the sleeve of the Fuel inlet inside the sleeve is separated in a pressure-tight manner remains.
  • Another special embodiment of the invention is characterized in that the nozzle needle between the Control room and the pressure room is guided.
  • the nozzle needle of the injector according to the invention can be shorter than conventional nozzle needles are formed. That is why Leadership sufficient to ensure that the To ensure the injector.
  • Another special embodiment of the invention is characterized in that the inlet throttle in the sleeve is integrated.
  • the inlet throttle serves to absorb pressure surges in the Prevent operation.
  • Another special embodiment of the invention is characterized in that a step on the nozzle needle is formed which is a stop for the nozzle spring forms.
  • the advantage is that on a spring plate can be dispensed with. This will increase the number of Items reduced.
  • Another special embodiment of the invention is characterized in that the nozzle needle stroke by the Distance between the face of the Nozzle needle and the injector housing is defined.
  • This Execution type has the advantage that it manufacturing technology is particularly easy to implement.
  • Embodiment of the injector according to the invention has an injector housing labeled 1 in total.
  • the Injector housing 1 comprises a nozzle body 2, which with its lower free end into the combustion chamber supplying internal combustion engine protrudes. With its top, The end face remote from the combustion chamber is the nozzle body 2 with the help a (not shown) clamping nut axially against one Valve body 20 and a (not shown) Injector body biased.
  • a nozzle needle 4 is in the guide bore 3 guided axially displaceably with a tip 5.
  • a sealing surface which cooperates with a sealing seat, which on the Nozzle body 2 is formed. If the top 5 of the Nozzle needle 4 with its sealing surface in contact with the Is a sealing seat, there is a spray hole 6 in the nozzle body 2 closed. When the nozzle needle tip 5 from its seat takes off, fuel subjected to high pressure is exhausted the spray hole 6 in the combustion chamber of the internal combustion engine injected.
  • the nozzle needle 4 has three areas with different diameters d 1 , d 2 and d 3 .
  • the diameter d 2 is largest and serves to guide the nozzle needle 4 in the nozzle body 2.
  • the diameter d 1 is also referred to as the seat diameter and is somewhat smaller than the nozzle needle diameter d 3 .
  • the nozzle needle diameter d 3 is smaller than the guide diameter d 2 .
  • the diameter d 3 is also referred to as the control diameter and the diameter d 2 as the guide diameter.
  • a nozzle spring 8 is in contact with the step 7.
  • the other end of the nozzle spring 8 is in contact with the lower end face of a sleeve 9 In this way, the nozzle spring 8 is biased between the step 7 and the sleeve 9.
  • the biasing force of the nozzle spring 8 ensures, on the one hand, that the tip 5 of the nozzle needle 4 is pressed against its seat, and, on the other hand, that the upper end face of the sleeve 9 is pressed against the valve body 20.
  • a biting edge 10 is formed on the upper end face of the sleeve 9 remote from the combustion chamber.
  • the inner diameter of the sleeve 9 is slightly larger than the diameter d 3 of the nozzle needle 4.
  • the end of the nozzle needle 4 remote from the combustion chamber can be displaced in the sleeve 9 with a sealing effect. In this way, the interior of the sleeve 9 is shielded from the environment in a pressure-tight manner.
  • a fuel inlet opens into the interior of the sleeve 9 11, which is formed in the valve body 20. outgoing extends a central axial bore 12 in the Nozzle needle 4 up to the height of a pressure chamber 15. At height of the pressure chamber 15 are two radial in the nozzle needle 4 Through holes 13 and 14 arranged crosswise. By the radial bores 13 and 14 becomes a connection between the pressure chamber 15 and the axial bore 12 created.
  • the high-pressure fuel passes from the rail via the fuel inlet 11, the interior of the sleeve 9, the axial bore 12 and the radial bores 13 and 14 into the pressure chamber 15.
  • the diameter ratios chosen between the diameters d 1 , d 2 and d 3 the nozzle needle 4 is partially balanced. Due to the biasing force of the nozzle spring 8, the nozzle needle tip 5 is pressed against its seat.
  • control chamber 16 is formed between the outer periphery of the sleeve 9 and the inner Circumferential surface of the longitudinal bore 3 at the end remote from the combustion chamber of the nozzle body 2.
  • the Control chamber 16 is connected to the inlet throttle 19 Interior of the sleeve 9 and thus with the fuel inlet 11 connected. First of all, control room 16 also prevails the rail pressure.
  • the control chamber 16 can be connected via an outlet throttle 17 Dependence on the position of a control valve member 18 with a (not shown) pressure relief space get connected. If that is the case, the pressure drops in the control room 16 under the rail pressure and that before balanced ratio between the pressurized Surfaces of the nozzle needle 4 no longer exist. That has the consequence that the nozzle needle 4 lifts from its seat and high pressure fuel from the pressure chamber 15 in the combustion chamber of the internal combustion engine is injected. If the connection to the relief room through the Control valve member 18 is interrupted, the pressure rises in the control chamber 16 again slowly and the nozzle needle 4 closes.
  • the sleeve 9 is due to its geometric dimensions force-balanced.
  • the bite edge 10 is on the inside diameter the sleeve 9 arranged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP00949125A 1999-07-16 2000-06-24 Common-rail-injektor Expired - Lifetime EP1114247B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19933328A DE19933328A1 (de) 1999-07-16 1999-07-16 Common-Rail-Injektor
DE19933328 1999-07-16
PCT/DE2000/002060 WO2001006111A1 (de) 1999-07-16 2000-06-24 Common-rail-injektor

Publications (2)

Publication Number Publication Date
EP1114247A1 EP1114247A1 (de) 2001-07-11
EP1114247B1 true EP1114247B1 (de) 2004-10-13

Family

ID=7914977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00949125A Expired - Lifetime EP1114247B1 (de) 1999-07-16 2000-06-24 Common-rail-injektor

Country Status (6)

Country Link
US (1) US6568368B1 (ko)
EP (1) EP1114247B1 (ko)
JP (1) JP2003504556A (ko)
KR (1) KR100692885B1 (ko)
DE (2) DE19933328A1 (ko)
WO (1) WO2001006111A1 (ko)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10054991A1 (de) * 2000-11-07 2002-05-29 Bosch Gmbh Robert Druckgesteuerter Injektor zum Einspritzen von Kraftstoff mit Doppelventil
DE10155187B4 (de) * 2001-11-12 2007-08-16 L'orange Gmbh Einspritzinjektor für Brennkraftmaschinen
DE10160490B4 (de) * 2001-12-08 2005-10-06 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung, Kraftstoffsystem sowie Brennkraftmaschine
DE10326043A1 (de) * 2003-06-10 2004-12-30 Robert Bosch Gmbh Einspritzdüse für Brennkraftmaschinen
US7464697B2 (en) 2005-08-19 2008-12-16 The United States Of America, As Represented By The Administrator Of The U.S. Environmental Protection Agency High-pressure fuel intensifier system
DE102007011685A1 (de) * 2007-03-09 2008-09-11 Robert Bosch Gmbh Kraftstoffinjektor mit verbessertem Steuerventil
WO2018098308A1 (en) * 2016-11-22 2018-05-31 Cummins Inc. Injector method of switching between injection state and drain state

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3442451A (en) * 1967-06-14 1969-05-06 Gen Motors Corp Dual stage accumulator type fuel injector
US3669354A (en) * 1970-09-08 1972-06-13 J & T Eng Ascot Ltd Fluid injectors
US4462368A (en) * 1980-07-10 1984-07-31 Diesel Kiki Company, Ltd. Fuel injection system for internal combustion engine
US4667638A (en) * 1984-04-17 1987-05-26 Nippon Soken, Inc. Fuel injection apparatus for internal combustion engine
ATE98340T1 (de) * 1986-09-25 1993-12-15 Ganser Hydromag Elektronisch gesteuertes einspritzsystem.
US5301875A (en) * 1990-06-19 1994-04-12 Cummins Engine Company, Inc. Force balanced electronically controlled fuel injector
US5647536A (en) * 1995-01-23 1997-07-15 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
DE19647304C1 (de) * 1996-11-15 1998-01-22 Daimler Benz Ag Kraftstoffeinspritzanlage für eine Brennkraftmaschine
US5860597A (en) * 1997-03-24 1999-01-19 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
US5899389A (en) * 1997-06-02 1999-05-04 Cummins Engine Company, Inc. Two stage fuel injector nozzle assembly
DE19724637A1 (de) * 1997-06-11 1998-12-17 Bosch Gmbh Robert Einspritzventil
DE19744518A1 (de) * 1997-10-09 1999-04-15 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
US6079641A (en) * 1998-10-13 2000-06-27 Caterpillar Inc. Fuel injector with rate shaping control through piezoelectric nozzle lift
GB9916464D0 (en) * 1999-07-14 1999-09-15 Lucas Ind Plc Fuel injector
US6408821B1 (en) * 2000-12-19 2002-06-25 Caterpillar Inc. Fuel injection system with common actuation device and engine using same

Also Published As

Publication number Publication date
US6568368B1 (en) 2003-05-27
DE19933328A1 (de) 2001-01-25
EP1114247A1 (de) 2001-07-11
KR100692885B1 (ko) 2007-03-12
KR20010075090A (ko) 2001-08-09
WO2001006111A1 (de) 2001-01-25
JP2003504556A (ja) 2003-02-04
DE50008218D1 (en) 2004-11-18

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