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EP1277952A2 - Injecteur avec soupapes ouvrantes vers l'intérieur disposées l'une derrière l'autre - Google Patents

Injecteur avec soupapes ouvrantes vers l'intérieur disposées l'une derrière l'autre Download PDF

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Publication number
EP1277952A2
EP1277952A2 EP02014393A EP02014393A EP1277952A2 EP 1277952 A2 EP1277952 A2 EP 1277952A2 EP 02014393 A EP02014393 A EP 02014393A EP 02014393 A EP02014393 A EP 02014393A EP 1277952 A2 EP1277952 A2 EP 1277952A2
Authority
EP
European Patent Office
Prior art keywords
valve
spring
spring element
valves
fuel injector
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
Application number
EP02014393A
Other languages
German (de)
English (en)
Other versions
EP1277952B1 (fr
EP1277952A3 (fr
Inventor
Nestor Rodriguez-Amaya
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 EP1277952A2 publication Critical patent/EP1277952A2/fr
Publication of EP1277952A3 publication Critical patent/EP1277952A3/fr
Application granted granted Critical
Publication of EP1277952B1 publication Critical patent/EP1277952B1/fr
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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means

Definitions

  • I-valves inward opening valves
  • HC formation HC formation
  • EP 0 823 549 A2 relates to an injector.
  • This injector includes an injector body and a nozzle needle slidably received in this. Using a closing spring pushed the nozzle needle into its seat.
  • a fuel supply line is provided with which fuel is supplied to the nozzle needle in the region of a conical surface in such a way that there is a force directed against the action of the closing spring.
  • With a drain valve becomes the connection between the fuel supply line and an outlet controlled to the low pressure area of the fuel injector.
  • the fuel pressure is controlled in a control room, partially by a surface of the nozzle needle or a component added to it is defined.
  • the nozzle needle or the component recorded on it is oriented such that at high pressure levels A force acting on the nozzle needle is generated in the control room, which is the force of the Closing spring supports.
  • the drain valve and the control valve are operated by means of an electromagnetic Actuator, designed as a component, controlled.
  • the control valve and the Face of the nozzle needle or the component interacting with it (for example a plunger or the like), which form part of the control chamber, are dimensioned in such a way that the control valve is essentially pressure balanced at all times.
  • the drain and control valve are electromagnetic on both sides Actuator arranged one behind the other, the strokes of the drain valve and Control valve are simultaneously impressed by the electromagnetic actuator and one by one independent control of the two valves connected in series is not is possible.
  • the solution according to the invention can be used to open inwards on an injector Connect valves (I-valves) one after the other in such a way that an injection course is formed by cross-sectional throttling can be implemented in an intermediate switching state.
  • the solution according to the invention can be used to set very small strokes with which again very small injection quantities for certain phases of the injection in adaptation to achieve the course of combustion taking place in the combustion chamber.
  • valve needles By connecting two I-valves in series, their two valve needles can be connected an actuator - be it an electromagnet or a piezo actuator. Between the two valve needles of the I-valves connected in series are fitted with a spring assembly, which, for example, can comprise two spiral springs connected in parallel.
  • the Spring assembly is preferred between the two valve needles of the series connected I valves added while the valve needle of the actuator is remote I-valve is supported by a spring element. The stroke of this valve needle is smaller than that of this upstream valve needle. Both valve needles therefore close when actuating the actuator due to the different reaching their respective closed position on the valve needle seats with different stroke paths.
  • valve needles of the first and the second I-valve arranged spring assembly as a first approximation stiff spring, so that the spring preload of the spring element assigned to the first I-valve in a first actuating movement of the actuator can be overcome. If the actuating force increases further can be achieved via the stroke travel reserve provided on the second I-valve in the area of the latter Valve needle seat a very short stroke - depending on the actuation of the actuator - realize that allows injection course shaping by cross-sectional throttling on the second I-valve, which the combustion progress in the combustion chamber of the internal combustion engine Measurement of very small injection quantities takes into account.
  • FIG. 1 The representation according to FIG. 1 is the schematic diagram of a double I valve with a stepwise Connection option can be found.
  • a fuel injector 1 comprises a first housing part 2 and a further housing part 3, which abut each other at a parting line 45.
  • the selected two-part version of the injector housing facilitates assembly of the receptacles accommodated one behind the other, inward opening valves (I-valves) 8 or 24.
  • an actuator 4 is arranged, which as shown in Figure 1 as an electromagnet is formed.
  • the actuator 4 comprises a plate-shaped element 5, which on an upper end face 29 of a second valve needle 25 of the second valve 24 is included.
  • a magnet coil 6 is arranged opposite the plate 5. Between a stroke 7 is provided for the plate 5 of the actuator 4. When the solenoid is excited 6 this stroke 7 is overcome and an actuating movement in the second valve needle 25 of the second switching valve 24 initiated.
  • first valve needle 9 of the first Valve 8 (I-valve) inserted in the second housing part 3 of the fuel injector 1 .
  • the valve needle 9 has an upper end face 10, with which protrudes into a cavity 44 in the first housing part 2.
  • On the face 10 opposite end is the first valve needle 9 with a compensating piston 16 provided, on the end face 18 of a first spring element 19 abuts.
  • the first spring element 19 is preferably designed as a spiral spring and is supported on the second housing part 3 from.
  • the first valve needle 9 of the I-valve 8 is annular in shape from a first chamber 13 enclosed, which can be acted upon by an inlet 20 with fuel under high pressure is.
  • a valve needle seat 12 is formed between the first chamber 13 and the second chamber 14 of the first I-valve 8.
  • the valve seat 12 of the first I-valve 8 is a housing-side valve seat surface 21 and a conical Section 22, the valve sealing surface of the first valve needle 9 is formed.
  • the stroke distance which the first valve needle 9 has to reach Has to cover the closed position on the valve needle seat 8, marked with reference number 11.
  • Below the valve needle seat 12 there is an annular gap 15 in the second housing part 3 provided that connects to the valve needle seat 12 of the first I-valve 8 and the first chamber 13 and the second chamber 14 of the first I-valve 8 connects to each other.
  • the second valve needle 25 of the second is in the first housing part 2 of the fuel injector 1 I-valve 24 added, on the upper end 29 of the magnet coil 6 opposite Plate 5 is attached.
  • the second valve needle 25 is provided with a compensating piston 42.
  • the second nozzle needle 25 of the second I-valve 24 is ring-shaped by a third chamber 26 enclosed.
  • a fourth chamber 27 encloses the second valve needle 25 of the second I-valve 24 above the compensating piston formed on the second valve needle 25 42.
  • Between the third chamber 26 and the fourth chamber 27 is one Valve needle seat 31 is formed.
  • the valve needle seat 31 runs into an annular gap on the housing side 28, which is closed when the second valve needle 25 is closed.
  • a conical valve sealing surface 32 is formed on the second valve needle 25, which in the area of the valve needle seat 31 has a housing-side, i.e. on the first housing part 2 formed valve seat surface 33 is opposite.
  • the second valve needle 25 of the second I-valve 24 defines a stroke designated by reference numeral 36 within the first housing part 2 of the injector 1 back.
  • the third chamber 26 of the second I-valve stands over an inlet 23 or 20 with a fuel source not shown here in communication, while the fourth chamber 27 of the second I-valve 24 is a relief line 34 includes, via which the fourth chamber 27 with the low pressure area - here not shown - the fuel injector 1 is connected.
  • a second spring element 37 is received between the end face 30 of the second valve needle facing the first valve needle 9 25 and the end face 10 of the first valve needle 9, a second spring element 37 is received.
  • the second spring element 37 is in the cavity 44 of the first housing part 2 recessed, disc-shaped spring plate 35 enclosed.
  • the Spring plate 35 is supported with its upper annular surface on the boundary of the cavity 44 in the first housing part 2.
  • a third spring element is supported on its lower annular surface 39 38 from which surrounds the second spring element 37.
  • the one in the illustration. 1 in the cavity 44 in the first housing part 2 embedded spring elements 37 and 38 form a spring assembly, consisting of two spiral springs connected in parallel in this case.
  • the end face 30 of the compensating piston 42 of the second valve needle 25 therefore moves to the inner one, from the second one Spring element 37 passes through the bore or its edge until the end face 30 of the Compensating piston 42 abuts the spring plate 35.
  • the actuating force generated on the actuator 4 now acts on the second valve needle 25 both the spring force of the second spring element 37 and the spring force of the spring plate 35 in the cavity 44 supporting third spring element 38.
  • the throttling impressed on the second valve needle seat 31 be varied so that only the smallest amounts of fuel from the third chamber 26 of the second I-valve 24 flow into the inlet 20 towards the nozzle.
  • the seat cross-section which connects the third chamber 26 and the chamber 27 creates, is of the actuating force that can be generated by the actuator 4 and counteracting this Force of the fender package 37 or 38 in the cavity of the first housing part 2 and the force of the spring 19 in the cavity of the lower housing part 3 depends. It can be done with of the chosen design variant realize the smallest stroke distances, with which in turn display favorable injection quantity curves, which are in the combustion chamber Internal combustion engine optimally used depending on the combustion phase prevailing there can be.
  • FIG. 1.1 shows an embodiment variant of an arrangement of a double I valve inside of a housing.
  • an actuator 4 is arranged, which is analogous to Representation in Figure 1 is designed as an electromagnet.
  • the actuator 4 comprises a plate-shaped one Element 5, which acts on a pressure pin.
  • the plate-shaped element 5 opposite, a solenoid 6 is arranged. If the magnet coil 6 is excited, bridges the plate-shaped element 5, the plate stroke 7 towards the solenoid 6, whereby one with the plate-shaped element 5 in connection with the pressure pin vertical downward movement is impressed.
  • the first I-valve 8 the first valve needle 9 of which comprises a compensating piston 16 a spring assembly of spring elements 37 and 38 is supported on its lower end face 18.
  • the end face 18 of the first valve needle 9 is directly by the second spring element 37 supported, with a recessed in the cavity 44 spring plate 35 on its underside is supported by the third spring element 38.
  • the two spring elements 37 and 38 are supported on the support surface 40 of the cavity 44 in the housing.
  • the valve needle seat 12 of the first I-valve 8 is analogous to the valve needle seat of the first I-valve 8 according to FIG Obtain representation in Figure 1.
  • 24 is the second I-valve 24 opposite to the first I-valve in the first housing part 2, i.e. upside down, oriented.
  • the valve needle seat 31 of the second I-valve is rotated to the valve needle seat 31 of the second I-valve 24 as shown in the figure 1 formed in the first housing part 2 there.
  • a disk-shaped configured element 46 is formed in a diameter that the outer diameter the first or the second valve needle 9 or 25 exceeds. That as a separating element acting disc-shaped element 46 is enclosed by a space that is limited by the wall of an inner bore of a ring 47.
  • the chambers 13 assigned to the first I-valve 8 and the second I-valve 24, respectively or 26 can flow downstream through a volume that is controlled from both chambers Hole are brought together within the housing.
  • Figure 2 shows the spring force, plotted against the stroke of the first and the second I-valve in the injector housing configured in two parts.
  • valve needles 9 and 25 realized via a spring package rigid spring are connected, so that both valve needles 9 and 25 with an actuator 4 can be operated.
  • Both valve needles 9 and 25 are equipped with different strokes 36 and 11, the spring elements assigned to these valve springs 9 and 25, ie the first spring element 19 and the second and third spring elements 37 and 38 of the in the cavity 44 of the first housing part Have 2 different spring characteristics.
  • the first spring element has a spring characteristic c 1 , which is dimensioned smaller than the spring characteristic c 2 of the second spring element 37 in the cavity 44. In the valve-open position, the first spring element 19 and the second spring element 37 of the spring assembly are preloaded with the same preload force. This point is designated by "1" in the diagram according to FIG. 2.
  • the actuator 4 When the spring plate 35, which is biased by the third spring element 38 in the cavity 44, is reached, the actuator 4 has to overcome a force level which is indicated in the diagram according to the illustration in FIG. 2 by the line between numbers 4 and 5. From number 5 in the diagram as shown in FIG. 2, the second spring element 37 and the third spring element 38 of the spring package in the cavity 44 act as parallel-connected springs with their stiffnesses c 2 and c 3 . Finally, at point 6, the second valve needle 25 of the second I-valve 24 has moved into its valve needle seat 31, so that the second I-valve 24 is also in its closed position in the first housing part 2.
  • the injection quantity when the first I valve 8 is closed only by throttling on the valve seat 31 second valve needle 25 of the second I-valve 24 in the first housing part 2 of the fuel injector 1 dependent.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02014393A 2001-07-16 2002-06-28 Injecteur avec soupapes ouvrantes vers l'intérieur disposées l'une derrière l'autre Expired - Lifetime EP1277952B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10134529 2001-07-16
DE10134529A DE10134529C2 (de) 2001-07-16 2001-07-16 Injektor mit hintereinandergeschalteten, nach innen öffnenden Ventilen

Publications (3)

Publication Number Publication Date
EP1277952A2 true EP1277952A2 (fr) 2003-01-22
EP1277952A3 EP1277952A3 (fr) 2004-01-28
EP1277952B1 EP1277952B1 (fr) 2005-05-04

Family

ID=7691954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02014393A Expired - Lifetime EP1277952B1 (fr) 2001-07-16 2002-06-28 Injecteur avec soupapes ouvrantes vers l'intérieur disposées l'une derrière l'autre

Country Status (3)

Country Link
US (1) US6908044B2 (fr)
EP (1) EP1277952B1 (fr)
DE (2) DE10134529C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1961953A1 (fr) * 2007-02-26 2008-08-27 Robert Bosch Gmbh Soupape à plusieurs voies

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060202053A1 (en) * 2005-03-09 2006-09-14 Gibson Dennis H Control valve assembly and fuel injector using same
US7737155B2 (en) * 2005-05-17 2010-06-15 Schering Corporation Nitrogen-containing heterocyclic compounds and methods of use thereof
DE102006039266B4 (de) * 2006-08-22 2015-11-26 Volkswagen Ag 4/2-Wegeventil
DE102010039048A1 (de) * 2010-08-09 2012-02-09 Robert Bosch Gmbh Einspritzvorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823549A2 (fr) 1996-08-06 1998-02-11 Lucas Industries Public Limited Company Injecteur

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071197A (en) * 1976-02-19 1978-01-31 Caterpillar Tractor Co. Fuel injector with self-centering valve
US4527737A (en) * 1983-09-09 1985-07-09 General Motors Corporation Electromagnetic unit fuel injector with differential valve
US5241935A (en) * 1988-02-03 1993-09-07 Servojet Electronic Systems, Ltd. Accumulator fuel injection system
US4986472A (en) * 1989-09-05 1991-01-22 Cummins Engine Company, Inc. High pressure unit fuel injector with timing chamber pressure control
US5121730A (en) * 1991-10-11 1992-06-16 Caterpillar Inc. Methods of conditioning fluid in an electronically-controlled unit injector for starting
DE4434892A1 (de) * 1994-09-29 1996-04-11 Siemens Ag Einspritzventil
DE19956598A1 (de) * 1999-11-25 2001-06-13 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10062896B4 (de) * 2000-12-16 2009-12-17 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823549A2 (fr) 1996-08-06 1998-02-11 Lucas Industries Public Limited Company Injecteur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1961953A1 (fr) * 2007-02-26 2008-08-27 Robert Bosch Gmbh Soupape à plusieurs voies

Also Published As

Publication number Publication date
US20030019956A1 (en) 2003-01-30
EP1277952B1 (fr) 2005-05-04
US6908044B2 (en) 2005-06-21
DE10134529C2 (de) 2003-07-03
DE10134529A1 (de) 2003-02-13
EP1277952A3 (fr) 2004-01-28
DE50202972D1 (de) 2005-06-09

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