EP2156045A1 - Injecteur - Google Patents
InjecteurInfo
- Publication number
- EP2156045A1 EP2156045A1 EP08736615A EP08736615A EP2156045A1 EP 2156045 A1 EP2156045 A1 EP 2156045A1 EP 08736615 A EP08736615 A EP 08736615A EP 08736615 A EP08736615 A EP 08736615A EP 2156045 A1 EP2156045 A1 EP 2156045A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- guide element
- valve piece
- injector
- sleeve
- 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
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
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
-
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0071—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"
-
- 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
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
- F02M63/0078—Valve member details, e.g. special shape, hollow or fuel passages in the valve member
- F02M63/008—Hollow valve members, e.g. members internally guided
Definitions
- the invention relates to an injector for injecting fuel into a combustion chamber of an internal combustion engine, in particular a common rail injector according to the preamble of claim 1.
- EP 1 612 403 A1 describes a common-rail injector with a control valve (servo-valve) pressure-balanced in the axial direction for blocking and opening a fuel outflow channel from a control chamber.
- the control valve By means of the control valve, the fuel pressure can be influenced within the control chamber, wherein the control chamber is permanently supplied via an inlet throttle with fuel under high pressure.
- a valve element By varying the fuel pressure within the control chamber, a valve element is moved between an open position and a closed position, the valve element releasing the fuel flow into the combustion chamber of an internal combustion engine in its open position.
- the control valve comprises an adjustable in the axial direction by means of an electromagnetic actuator valve sleeve which is guided on an integrally formed with a valve piece guide pin.
- the valve sleeve defines a valve chamber of the control valve formed by a reduced diameter portion of the guide pin only radially outward, so that no opening or closing forces of the high pressure Fuel within the valve chamber acting on the valve sleeve. Due to this characteristic, the control valve is suitable for switching very high pressures. Since the high-pressure fuel through the vertical drain channel and lateral, the drain channel intersecting transverse bores in the valve piece must flow into the valve chamber, the miniaturization of such control valves are limited. For fuel pressures above 2000 bar only comparatively large valve seat diameter can be realized for reasons of strength, otherwise there is a risk of breakage of the valve piece in the area of the existing bore intersections.
- valve sleeve encloses a separate from the valve piece pressure pin, which only has the task to seal the valve located within the valve sleeve valve chamber in the axial direction upwards.
- the separation of the valve piece and pressure pin eliminates the need to produce complicated Bohrungsverschneidungen in the valve piece and it accounts thus in particular the high tensile stresses loaded areas of the previous valve piece.
- the valve seat diameter can be made significantly smaller than is the case with the prior art known from EP 1 612 403 A1.
- the disadvantage is that for the valve sleeve a guide must be provided on its outer circumference in the valve piece.
- valve piece is complicated by the outer, extending in the axial direction, circumferentially closed guide.
- valve sleeve seat is no longer free on the surface of the Valve piece, but is sunk in the axial direction in the guide of the valve sleeve, so that it must be processed with a filigree grinding pin.
- a coating of the valve sleeve seat should be provided, this is very difficult to access for the coating process, which complicates the coating.
- located at the bottom of the guide valve sleeve seat for manufacturing reasons, only as a flat seat or concave conical seat, but not be designed as a convex conical seat.
- the invention is therefore based on the object to propose an injector with an axially adjustable valve sleeve having control valve, which on the one hand is easy to manufacture and on the other hand, strength problems are avoided.
- inventions also fall all combinations of at least two of the features specified in the description, the claims and / or the figures. For specified value ranges, values lying within the stated limits should also be disclosed as limit values and be used as desired.
- the invention is based on the idea to guide the valve sleeve with its outer diameter axially displaceable in a guide element, which is formed as a separate component from the valve member, but fixed to this.
- This embodiment has the advantage that the guide element can be set only after production of the valve seat for the valve sleeve on the valve piece, whereby the valve seat in the usual way can be produced, since the valve piece, in particular the valve seat (from above) is freely accessible. It is also possible to form the valve seat in any, in particular also convex conical seat shape.
- the guide element is easier to produce, as a grinding on the inner circumference guide bore for guiding the valve sleeve. Due to the provision of a separate, subsequently fixable on the valve member guide member for guiding the valve sleeve at its outer periphery can be dispensed with a guide of the valve sleeve by means of a guide pin on its inner circumference. This in turn means that it is possible to dispense with the necessary for a guidance of the valve sleeve on its inner circumference Bohrungsverschneidungen for discharging fuel, whereby the strength of the valve member is substantially improved.
- the guide element is designed as, in particular cylindrical, sleeve whose inner diameter corresponds at least in sections to the outer diameter of the valve sleeve plus a (minimum) guide clearance.
- a pressure pin is advantageously provided, which is pressurized in the axial direction upwards by the fuel flowing out of the control chamber.
- the outer diameter of the pressure pin corresponds to the inner diameter of the valve sleeve minus a minimum clearance.
- the pressure pin is supported in the axial direction upward on an injector component, in particular a holding body of an electromagnet arrangement. It is conceivable that the pressure pin, which preferably has no guiding function, is spring-loaded in the axial direction by means of a spring which is supported on the valve piece in the direction of the electromagnet arrangement.
- the guide element is fixed to the valve piece by means of a press fit.
- This embodiment is advantageously without additional fasteners.
- This type of attachment is particularly suitable for a sleeve-shaped (tubular) formed guide element, which is pressed in the axial direction on the valve piece. It is advantageous if the guide element is elastically deformable in the radial direction, at least in the region of the press fit, in order to improve the clamping effect.
- the guide element is fixed to a, in particular slightly conical portion of the valve piece.
- the cone angle of a corresponding inner cone of the guide element before its attachment to the conical portion in particular slightly smaller than the cone angle of the conical portion of the valve piece.
- the press fit as a so-called Morsekegelpassung, as it is known, for example, for the determination of tools on shafts, formed.
- the cone angle (angle between the axis of symmetry of the conical section and the oblique lateral surface of the conical section) of the conical section of the valve piece is small, in particular very small, preferably the cone angle is less than approximately
- the cone angle of the conical section lies in one
- Angle angle between the axis of symmetry of the inner cone and the oblique inner surface of the inner cone
- Inner cone of the guide element with advantage about 0.1 ° to about 1.5 °, preferably by about 0.25 ° to about 0.75 ° smaller than the cone angle of the conical portion of the
- valve seat is arranged on the valve piece directly adjacent to the conical portion of the valve piece on which the guide element is fixed.
- Valve seat designed as a convex conical seat, wherein the
- Angle of the conical surface is substantially flatter than the angle of the conical section for fixing the
- valve piece As
- the guide element rests with a continuous contact surface on the valve piece, in particular on the conical portion of the valve piece.
- the contact surface in particular annularly interrupted, preferably by an exemption, so a non-contacting area on the guide element and / or on the valve piece.
- two, in particular annular, in the axial direction by the clearance spaced contact areas between the guide member and the valve piece are formed, whereby the clamping action can be improved.
- an outflow channel has to be provided from the fuel volume within the valve sleeve.
- the transverse bore does not necessarily extend orthogonally to the longitudinal center axis of the valve sleeve, but may also be arranged obliquely.
- valve sleeve on its outer circumference and / or the guide element on its inner periphery with at least one mecanicnanschliff to form an axial outflow channel.
- Fig. 1 a highly schematic partial view of a
- Fig. 2 an alternative embodiment of an injector in a likewise highly schematic partial view.
- a section of a trained as a common rail injector injector 1 for injecting fuel into a combustion chamber, not shown, of an internal combustion engine is shown very schematically.
- Fig. 1 is intended to explain only the operation of the injector, wherein the size ratios shown do not correspond to the real size ratios.
- the injector 1 comprises a single-part or multi-part valve element 2 which is shown only in sections and which is adjustable between an open position and a closed position. In its open position (adjusted upward in the plane of the drawing), the valve element 2 releases the fuel flow from a pressure chamber 3 through a nozzle hole arrangement, not shown, into the combustion chamber of an internal combustion engine.
- valve element 2 delimits a control chamber 5.
- the latter is arranged radially inside a sleeve-shaped section of a valve piece 6 projecting into the pressure space 3.
- control chamber 5 opens a introduced into the sleeve-shaped portion of the valve piece 6 inlet throttle 7, via which the control chamber 5 is supplied with fuel from the pressure chamber 3.
- the pressure chamber 3 is in turn supplied by a fuel supply line 8 under high pressure fuel from a high-pressure fuel storage 9 (Rail).
- This is powered by a, in particular designed as a radial piston pump high-pressure pump 10 with fuel from a low-pressure reservoir 11.
- a radial piston pump high-pressure pump 10 with fuel from a low-pressure reservoir 11.
- valve piece 6 From the control chamber 5 opens an inserted in the axial direction in the valve piece 6 drain channel 14. This is provided with an outlet throttle 15, or designed as such.
- the drainage channel 14 spreads in his in the plane of the drawing upper portion and terminates in a valve chamber 16, which is bounded radially outwardly by the valve piece 6 and by an axially adjacent thereto valve sleeve 17 of a control valve 18 (servo valve).
- the valve chamber 16 of the control valve 18 In the axial upward direction, the valve chamber 16 of the control valve 18 is delimited by an axially displaceably mounted pressure pin 19, which is pressed by befindlichem within the valve chamber 16 fuel in the axial direction in the plane up against a drain pipe 36.
- the pressure pin 19 passes through a bore 37 in a holding body 20 of an electromagnet assembly 21.
- a closing spring 23 which is formed on an integrally formed with the valve sleeve 17 anchor plate 24 is supported, is spring-loaded against the outlet nozzle 36.
- the closing spring 23 acts simultaneously on the armature plate 24 and thus the valve sleeve with a spring force in the axial direction in the plane down to a formed on the valve piece 6, formed as a conical seat valve seat 25 of the control valve 18.
- the closing spring is supported on an annular shoulder of the holding body 20th the solenoid assembly 21 from.
- control valve 18 is a servo-pressure-balanced in the axial direction servo valve.
- a hollow cylindrical, sleeve-shaped guide member 26th intended to guide the valve sleeve 17 on its outer periphery.
- the guide member 26 is fixed by means of a press fit to a conical portion 27 of the valve piece 6, wherein an outer cone angle OC of the conical portion 27 is shown for reasons of illustration much larger than this is preferably formed in reality.
- the cone angle CC between a conical surface 28 and an axis parallel to the longitudinal central axis L of the control valve 18 is approximately 1 ° in this exemplary embodiment.
- the conical portion 27 facing away from end face 29 of the guide member 26 is arranged at an axial distance to the underside of the anchor plate 24.
- the valve seat 25 is disposed radially within the conical portion 27 and the conical surface 28 (conical surface).
- the guide element 26 is fixed by means of a press fit to the conical portion 27 of the valve piece 26.
- a cone angle ß of an inner cone 30 is like the cone angle CC of the conical portion 27 of the valve member 6 in the assembled state also 1 °. Before assembly, however, the cone angle ⁇ of the inner cone 30 is slightly smaller than the cone angle CC.
- the inner cone is expanded elastically outward in the radial direction in order to improve the clamping effect.
- the illustrated non-positive connection between the guide member 26 and the conical portion 27 of the valve member 6 is a kind Morsekegelpassung.
- the guide member 26 has two opposite arranged at the level of the valve seat 25, slightly inclined transverse bores 31, 32 introduced by the fuel from the valve chamber 16 at the valve seat 25 lifted valve sleeve 17 of the control valve 18 in the guide member 26 surrounding the low pressure region 12 of the Injector can flow. From the low-pressure region 12, the fuel can flow through the injector return 13 to the reservoir 11.
- valve sleeve 17 is moved from the position shown in Fig. 1 by energizing the solenoid assembly 21 in the plane up, so that fuel introduced via the introduced into the conical section 27, central drain passage 14 into the valve chamber 16 and from there below the Valve sleeve in the radial direction and through the transverse bores 31, 32 can flow into the low pressure region 12 and from there to the injector return 13.
- transverse bores 31, 32 themselves can be formed as discharge throttles.
- FIG. 2 The embodiment of an injector 1 shown in FIG. 2 essentially corresponds to the embodiment according to FIG. 1, so that only the differences will be discussed below in order to avoid repetition. With regard to the similarities, reference is made to the preceding description of the figures.
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)
- Glass Compositions (AREA)
- Disintegrating Or Milling (AREA)
- Jellies, Jams, And Syrups (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007022586A DE102007022586A1 (de) | 2007-05-14 | 2007-05-14 | Injektor |
PCT/EP2008/055206 WO2008138743A1 (fr) | 2007-05-14 | 2008-04-29 | Injecteur |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2156045A1 true EP2156045A1 (fr) | 2010-02-24 |
EP2156045B1 EP2156045B1 (fr) | 2010-11-24 |
Family
ID=39811713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08736615A Not-in-force EP2156045B1 (fr) | 2007-05-14 | 2008-04-29 | Injecteur |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2156045B1 (fr) |
CN (1) | CN101680405B (fr) |
AT (1) | ATE489551T1 (fr) |
DE (2) | DE102007022586A1 (fr) |
RU (1) | RU2469206C2 (fr) |
WO (1) | WO2008138743A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007044362A1 (de) | 2007-09-17 | 2009-03-19 | Robert Bosch Gmbh | Steuerventil für einen Kraftstoffinjektor |
DE102007044356A1 (de) * | 2007-09-17 | 2009-03-19 | Robert Bosch Gmbh | Injektor |
DE102007044361A1 (de) | 2007-09-17 | 2009-03-19 | Robert Bosch Gmbh | Steuerventil für einen Kraftstoffinjektor |
DE102014226258A1 (de) * | 2014-12-17 | 2016-06-23 | Robert Bosch Gmbh | Kraftstoffinjektor |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD122574A1 (fr) * | 1975-10-24 | 1976-10-12 | Karl Marx Stadt Automobilbau | |
FR2580728B1 (fr) * | 1985-04-19 | 1989-05-05 | Alsacienne Constr Meca | Systeme d'injection de combustible pour moteur diesel |
JPH0286953A (ja) * | 1988-09-21 | 1990-03-27 | Kanesaka Gijutsu Kenkyusho:Kk | 燃料噴射弁 |
US5191867A (en) * | 1991-10-11 | 1993-03-09 | Caterpillar Inc. | Hydraulically-actuated electronically-controlled unit injector fuel system having variable control of actuating fluid pressure |
GB9508623D0 (en) * | 1995-04-28 | 1995-06-14 | Lucas Ind Plc | "Fuel injection nozzle" |
DE19650900A1 (de) * | 1996-12-07 | 1998-06-10 | Bosch Gmbh Robert | Piezoelektrischer Aktuator |
IT1289794B1 (it) * | 1996-12-23 | 1998-10-16 | Elasis Sistema Ricerca Fiat | Perfezionamenti ad una valvola di dosaggio a comando elettromagnetico per un iniettore di combustibile. |
EP1612403B1 (fr) | 2004-06-30 | 2007-01-10 | C.R.F. Società Consortile per Azioni | Soupape servo pour controller l'injecteur d'un moteur à combustion interne |
DE102006055548A1 (de) * | 2006-11-24 | 2008-05-29 | Robert Bosch Gmbh | Kraftstoffinjektor |
-
2007
- 2007-05-14 DE DE102007022586A patent/DE102007022586A1/de not_active Withdrawn
-
2008
- 2008-04-29 DE DE502008001904T patent/DE502008001904D1/de active Active
- 2008-04-29 CN CN2008800157547A patent/CN101680405B/zh not_active Expired - Fee Related
- 2008-04-29 WO PCT/EP2008/055206 patent/WO2008138743A1/fr active Application Filing
- 2008-04-29 AT AT08736615T patent/ATE489551T1/de active
- 2008-04-29 EP EP08736615A patent/EP2156045B1/fr not_active Not-in-force
- 2008-04-29 RU RU2009146123/06A patent/RU2469206C2/ru not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2008138743A1 * |
Also Published As
Publication number | Publication date |
---|---|
RU2469206C2 (ru) | 2012-12-10 |
CN101680405B (zh) | 2012-03-21 |
DE502008001904D1 (de) | 2011-01-05 |
RU2009146123A (ru) | 2011-06-20 |
DE102007022586A1 (de) | 2008-11-27 |
EP2156045B1 (fr) | 2010-11-24 |
WO2008138743A1 (fr) | 2008-11-20 |
ATE489551T1 (de) | 2010-12-15 |
CN101680405A (zh) | 2010-03-24 |
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