EP2166218A2 - Soupape d'injection de combustible - Google Patents

Soupape d'injection de combustible Download PDF

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Publication number
EP2166218A2
EP2166218A2 EP09166426A EP09166426A EP2166218A2 EP 2166218 A2 EP2166218 A2 EP 2166218A2 EP 09166426 A EP09166426 A EP 09166426A EP 09166426 A EP09166426 A EP 09166426A EP 2166218 A2 EP2166218 A2 EP 2166218A2
Authority
EP
European Patent Office
Prior art keywords
valve
valve rod
coupler
plate
fuel injection
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.)
Withdrawn
Application number
EP09166426A
Other languages
German (de)
English (en)
Other versions
EP2166218A3 (fr
Inventor
Martin Kiontke
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 EP2166218A2 publication Critical patent/EP2166218A2/fr
Publication of EP2166218A3 publication Critical patent/EP2166218A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing

Definitions

  • the invention relates to a fuel injection valve for fuel injection systems of internal combustion engines. Specifically, the invention relates to the field of injectors for fuel injection systems of air compressing, self-igniting internal combustion engines.
  • a fuel injector with a pressure compensated control valve is known.
  • the known injector is used for injecting fuel into a combustion chamber of an internal combustion engine, wherein an injection valve member, which releases or closes at least one injection opening, is actuated by a control valve.
  • the control valve releases a connection from a control chamber in a fuel return or closes it. This is done by placing a closure element in a seat or releasing it.
  • a bore is formed, in which a pin is received, wherein the diameter of the bore substantially corresponds to the diameter of the seat.
  • the pin is supported on one side against a push rod, against a spring plate or against the injector housing.
  • the fuel injection valve according to the invention with the features of claim 1 has the advantage that a pressure-balanced switching valve is created with a reduced manufacturing cost in a structurally simple design.
  • a cost-intensive Erodiergeometrie omitted, achieved a high component strength and a reduced injector total length are possible.
  • the valve rod is designed as a cylindrical valve rod.
  • the valve rod has a first end face facing the low-pressure return, that the valve rod has a recess on the first end face and that a seat formed by a recess has a sealing diameter which is at least approximately equal to a diameter of the cylindrical valve rod.
  • a coupler sleeve in which the valve rod is guided, and that the coupler sleeve, a second end face of the valve rod, which faces away from the first end side of the valve rod, and an actuator piston connected to the actuator limit a coupler space.
  • the actuator can be controlled so that the actuator piston increases the coupler space, whereby the pressure in the coupler space collapses and the valve rod is actuated.
  • a coupler spring is provided which is supported on the one hand on the coupler sleeve and on the other hand on the valve rod, wherein the coupler spring acts on the valve rod in a direction in which a filling of the coupler space is made possible.
  • the coupler spring allows refilling of the coupler space.
  • a certain pressure reduction of the coupler space relative to the environment is made possible by the coupler spring, wherein the filling of the coupler space takes place by a pressure equalization.
  • the coupler spring is designed so that when the filling of the coupler space effected by the coupler spring, there is no sealing of the channel of the throttle plate by the valve rod. It is particularly advantageous that the bias of the coupler spring is set so that no closing of the sealing seat between the seat on the first end side of the valve rod and the throttle plate for closing the channel of the throttle plate is made possible by the coupler spring. As a result, an unwanted sealing of the low-pressure and high-pressure circuit is prevented in an advantageous manner.
  • the closing of the sealing seat between the seat on the first end side of the valve rod and the throttle plate for closing the channel of the throttle plate is effected by a corresponding actuation of the piezoelectric actuator, which takes place counter to the operation for opening the sealing seat.
  • the coupler sleeve is supported by means of a spring sleeve on the valve plate. It is also advantageous that the actuator and the coupler sleeve are arranged in an actuator space bounded by the valve plate, which is connected to the low-pressure return line. As a result, a pressure-balanced configuration of the switching valve is possible, can be omitted in the costly Erodiergeometrien and a high component strength can be achieved.
  • Fig. 1 shows an embodiment of a fuel injection valve 1 of the invention in a partial, schematic, axial sectional view.
  • the fuel injection valve 1 can serve in particular as an injector for fuel injection systems of air-compressing, self-igniting internal combustion engines.
  • a preferred use of the fuel injection valve 1 is for a fuel injection system with a common rail, the diesel fuel under high pressure leads to a plurality of fuel injection valves 1.
  • fuel injector 1 is also suitable for other applications.
  • the fuel injection valve 1 has a holding body 2 and a nozzle body 3.
  • the nozzle body 3 is connected to the holding body 2 in a suitable manner.
  • a nozzle needle 4 is arranged in the nozzle body 3.
  • the nozzle needle 4 has a valve closing body 5.
  • the nozzle body 3 has a valve seat body 6 adapted to the valve closing body 5.
  • the valve closing body 5 cooperates with the valve seat surface 6 of the nozzle body 13 in the sealing seat.
  • the nozzle needle 4 is arranged in a fuel chamber 7.
  • a control chamber sleeve 8 is arranged, which is acted upon by a valve spring 9 against a throttle plate 10.
  • the throttle plate 10, the control chamber sleeve 8 and an end face 11 of the nozzle needle 4 define a control chamber 12.
  • a fuel passage 13 is formed, which serves as a high-pressure inlet 13.
  • a through hole 14 connects to a valve body 15 attached to the holding body 2.
  • the valve plate 15 is disposed between the throttle plate 10 and the holding body 2.
  • a channel 16 in the throttle plate 10 connects.
  • the valve plate 15 has a recess 17 which is connected to the through hole 14.
  • the recess 17 in the Valve plate 15 forms a branch from the through hole 14 to an inlet throttle 18 in the throttle plate 10.
  • the inlet throttle 18, which is formed in the throttle plate 10 opens on the one hand into the recess 17 of the valve plate 15 and on the other hand into the control chamber 12.
  • the throttle plate 10 an outlet throttle 19.
  • the throttle plate 10 has a channel 20 which is connected to a low pressure through-hole 21 of the valve plate 15.
  • an actuator space 25 is formed within the holding body 2.
  • the holding body 2 has in this embodiment, a low pressure return 26 to which a return line 27 is connected.
  • the low-pressure return 26 opens in this embodiment in the actuator chamber 25.
  • the channel 20 is connected in the throttle plate 10 via the low-pressure through-hole 21 of the valve plate 15 and the actuator chamber 25 with the low-pressure return 26.
  • the valve plate 15 has a through hole 28. In the through hole 28, a valve rod 29 in the axial direction, that is, along its axis 30, out.
  • the axis 30 of the valve rod 29 is parallel to an axis 31 of the fuel injection valve 1 in this embodiment.
  • the valve plate 15 also has a recess 32.
  • the recess 32 of the valve plate 15 is connected to the through hole 28 of the valve plate 15. In this embodiment, the recess 32 is cut with the through hole 28 of the valve plate 15.
  • the outlet throttle 19 opens on the one hand in the control chamber 12 and on the other hand into the recess 32 of the valve plate 15.
  • the connected to the low-pressure return line 26 is 20 of the Valve rod 29 closed. It is in the Fig. 1 a state shown in which the valve rod 29 closes the channel 20.
  • the valve rod 29 has a throttle plate 10 facing, substantially concave end face 33. By the concave end face 33, a seat 34 is formed on the valve rod 29.
  • the valve rod 29 is designed substantially cylindrical.
  • the seat 34 has a seat diameter which is identical to a diameter 35 of the valve rod 29.
  • the concave end face 33 of the valve rod 29 is formed by a recess 36 on the end face 33.
  • the recess 36 may be configured, for example, conical or hemispherical.
  • the end face 33 faces the throttle plate 10.
  • the recess 32 of the valve plate 15 is provided on one of the throttle plate 10 facing side 37 of the valve plate 15.
  • a coupler sleeve 40 is arranged, in which the valve rod 29 is guided in sections.
  • the coupler sleeve 40 is designed in this embodiment, two-piece, namely a hollow cylindrical part 41 and a sleeve member 42, wherein the sleeve member 42 has a circumferential collar 43.
  • the valve rod 29 is guided in the hollow cylindrical part 41 of the coupler sleeve 40.
  • the hollow cylindrical part 41 of the coupler sleeve 40 has a through hole 44 in which the valve rod 29 is arranged in sections.
  • a piezoelectric actuator 45 is arranged, to which a transition piece 46 is added.
  • the transition piece 46 is connected to an actuator piston 47.
  • the Actuator piston 47 is guided in the sleeve part 42 of the coupler sleeve 40. In this case, a displaceability of the actuator piston 47 with respect to the axis 30 is limited by the hollow cylindrical part 41 of the coupler sleeve 40.
  • the sleeve part 42 is supported on the valve plate 15 via a spring sleeve 48.
  • the spring sleeve 48 encloses sections of the sleeve part 42 of the coupler sleeve 40.
  • the sleeve member 42 is supported on its peripheral collar 43 on the spring sleeve 48 from.
  • the actuator piston 47, the coupler sleeve 40 and an end face 49 of the valve rod 29 define a coupler space 50, which is formed by the through hole 44.
  • the end face 49 of the valve rod 29, which limits the coupler space 50, is remote from the end face 33 of the valve rod 29.
  • a support ring 51 is provided, which is inserted into a recess of the valve rod 29.
  • a coupler spring 52 is arranged, which is supported on the one hand via the support ring 51 on the valve rod 29 and on the other hand on the hollow cylindrical part 41 of the coupler sleeve 40.
  • the coupler spring 52 acts on the valve rod 29 in a direction 53 in which a filling of the coupler chamber 50 with fuel from the actuator chamber 25 is made possible.
  • the filling takes place via one or more gaps, for example via a guide gap between the valve rod 29 and the hollow cylindrical part 41 of the coupler sleeve and / or a guide gap between the actuator piston 47 and the sleeve part 42 of the coupler sleeve 40.
  • the coupler spring 52 is configured so that in the in the Fig. 1 illustrated closed position of the valve rod 29, wherein the channel 20 is closed, no force is exerted on the valve rod 29.
  • the actuator 45 For actuating the fuel injection valve 1, the actuator 45 is driven so that it contracts. As a result, the actuator piston 47 lifts out of contact with the hollow cylindrical part 41 of the coupler sleeve 40. As a result, the pressure in the coupler chamber 50 collapses. Via the channel 20 is located on the end face 33 of the valve rod 29, the low pressure of the low-pressure return 26, which is greater than the collapsed pressure in the coupler chamber 50. Thus, there is an actuation of the valve rod 29 against the direction 53. This causes a connection of the outlet throttle 19 released with the channel 20 via the recess 32. As a result, high-pressure fuel can flow out of the control chamber 12 via the outlet throttle 19, so that the pressure in the control chamber 12 drops.
  • the piezoelectric actuator 45 is actuated in the opposite direction, so that the actuator piston 47 again in the in the Fig. 1 shown initial position is reset. In this case, the pressure in the coupler chamber 50 rises again, so that the valve rod 29 is adjusted in the direction 53, and the channel 20 is closed again.
  • the control valve 55 which is actuated by the piezoelectric actuator 45, the valve rod 29, the valve plate 15, the throttle plate 10, the coupler sleeve 40, the actuator piston 47 and the spring sleeve 48 on. Further, the control valve 55, the coupler spring 52 to ensure sufficient filling of the coupler chamber 50 with fuel.
  • the coupler spring 52 is configured such that in a position of the control valve 55, in which the pressure of the coupler chamber 50 has collapsed, an adjustment of the valve rod 29 in the direction 53, wherein the adjustment of the valve rod 29 is limited by the coupler spring 52 in that no closing of the channel 20 by the valve rod 29 is enabled solely on the basis of the force of the coupler spring 52.
  • the pressure equalization in the coupler chamber 50 thus takes place before reaching the sealing seat between the seat 34 on the end face 33 of the valve rod 29 for closing the channel 20. This prevents unwanted sealing of the low pressure from the high pressure circuit.
  • the configuration of the fuel injection valve 1 of the described embodiment has several advantages. Due to the hydraulic concept with inverse activation of the piezoelectric actuator 45, no high-pressure supply line in the valve plate 15 and thus no cost-intensive Erodiergeometrie is required. This omission makes it possible to increase the component strength. For example, a high pressure of the fuel supplied via the high-pressure inlet 13 may be 260 MPa (2600 bar).
  • the sealing diameter that is, the sealing seat diameter, of the valve rod 29, which is determined by the seat 34 on the end face 33, on the outer diameter 35 of the valve rod 29, a pressure infiltration and thus an opening force on the valve rod 29 is prevented.
  • the piezoelectric actuator 45 thus does not have to work against the system pressure.
  • a negative stroke of the piezoelectric actuator 45 causes, as a result, the pressure in the coupler chamber 50 below the return pressure, that is, the low pressure of the low pressure return line 26 falls.
  • the valve rod 29 is thus lifted from its sealing seat, so that the high pressure of the control chamber 12 is throttled connected to the low pressure of the low pressure circuit 26. Due to the resulting pressure drop in the control chamber 12, the movement of the nozzle needle 4 and thus the fuel injection is achieved.
  • the injection via the nozzle opening 54 of the nozzle body 3 is terminated by a control of the piezoelectric actuator 45 and the consequent sealing of the channel 20 in the throttle plate 10.

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)
EP09166426A 2008-09-17 2009-07-27 Soupape d'injection de combustible Withdrawn EP2166218A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810042158 DE102008042158A1 (de) 2008-09-17 2008-09-17 Brennstoffeinspritzventil

Publications (2)

Publication Number Publication Date
EP2166218A2 true EP2166218A2 (fr) 2010-03-24
EP2166218A3 EP2166218A3 (fr) 2010-06-23

Family

ID=41278302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09166426A Withdrawn EP2166218A3 (fr) 2008-09-17 2009-07-27 Soupape d'injection de combustible

Country Status (3)

Country Link
EP (1) EP2166218A3 (fr)
CN (1) CN101676549A (fr)
DE (1) DE102008042158A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009028979A1 (de) * 2009-08-28 2011-03-03 Robert Bosch Gmbh Kraftstoffinjektor für eine Brennkraftmaschine
DE102012208075A1 (de) * 2012-05-15 2013-11-21 Man Diesel & Turbo Se Injektor für eine Kraftstoffversorgungsanlage einer Brennkraftmaschine sowie Kraftstoffversorgungsanlage
EP3290684A1 (fr) * 2016-08-31 2018-03-07 Continental Automotive GmbH Injecteur de fluide et aiguille d'injecteur de fluide
CN112901391A (zh) * 2021-03-08 2021-06-04 上海钧风电控科技有限公司 一种阀杆组件、高压燃料喷射阀及发动机电控燃料喷射***

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021741A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005059437A1 (de) * 2005-12-13 2007-06-14 Robert Bosch Gmbh Kraftstoffinjektor
DE102006026381A1 (de) * 2006-06-07 2007-12-13 Robert Bosch Gmbh Kraftstoffinjektor mit Druckübersetzer und niederdruckseitig angeordnetem Piezosteller
DE102007011685A1 (de) * 2007-03-09 2008-09-11 Robert Bosch Gmbh Kraftstoffinjektor mit verbessertem Steuerventil

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006021741A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil

Also Published As

Publication number Publication date
CN101676549A (zh) 2010-03-24
EP2166218A3 (fr) 2010-06-23
DE102008042158A1 (de) 2010-03-18

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