EP3032085A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

Info

Publication number
EP3032085A1
EP3032085A1 EP15192569.0A EP15192569A EP3032085A1 EP 3032085 A1 EP3032085 A1 EP 3032085A1 EP 15192569 A EP15192569 A EP 15192569A EP 3032085 A1 EP3032085 A1 EP 3032085A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve piece
fuel injector
piece
shoulder
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
EP15192569.0A
Other languages
German (de)
English (en)
Other versions
EP3032085B1 (fr
Inventor
Lars Olems
Philipp Schott
Axel Schnaufer
Thomas Nierychlo
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 EP3032085A1 publication Critical patent/EP3032085A1/fr
Application granted granted Critical
Publication of EP3032085B1 publication Critical patent/EP3032085B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M2200/03—Fuel-injection apparatus having means for reducing or avoiding stress, e.g. the stress caused by mechanical force, by fluid pressure or by temperature variations
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/803—Fuel injection apparatus manufacture, repair or assembly using clamp elements and fastening means; e.g. bolts or screws
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003—Valve inserts containing control chamber and valve piston

Definitions

  • the invention relates to a fuel injector for a fuel injection system, in particular for a common rail injection system, having the features of the preamble of claim 1.
  • the fuel injector comprises a control valve which serves to control a liftable injection valve member, at least one injection opening releasable or closable via the lifting movement is.
  • the control valve comprises a valve piece, which is inserted into a holding body of the fuel injector and fixed in position by means of a valve clamping screw.
  • the valve piece has a hollow cylindrical portion in which an end portion of the injection valve member is received and guided, so that the injection valve member and the valve piece together define a control space.
  • the control valve is opened, so that is able to flow out of the control chamber via an outlet channel formed in the valve piece and a throttle formed therein. If the control valve is closed, pressure builds up in the control chamber due to inflowing fuel, which enters the control chamber via an inlet throttle.
  • valve piece of the illustrated control valve has a shoulder sloping radially outwards for supporting the valve clamping screw.
  • the shoulder-supported End face of the valve clamping screw also runs obliquely to allow a flat contact with the shoulder of the valve piece.
  • the present invention seeks to provide a fuel injector for a fuel injection system, in particular for a common rail injection system, which is robust and easy and inexpensive to manufacture.
  • the fuel injector proposed for a fuel injection system comprises a holding body and a control valve, wherein the control valve has a rotationally symmetrical valve piece inserted into the holding body, in which a discharge throttle is formed. Furthermore, the proposed fuel injector comprises a valve clamping screw for axially fixing the position of the valve piece in the holding body.
  • the valve clamping screw is supported directly or indirectly on a radially outwardly inclined sloping shoulder of the valve piece. According to the invention it is provided that the valve clamping screw has a shoulder of the valve piece facing flat executed end face.
  • the valve tightening screw is also supported either directly over an end surface bounding, radially inner annular edge or indirectly via a pressure ring which is inserted between the valve piece and the valve tightening screw, on the shoulder of the valve piece.
  • a "flat end face” is understood as meaning a radially extending end face. This means that the end face perpendicular to the longitudinal axis of Valve clamping screw runs. Such an end face is much simpler and thus cheaper to produce than a sloping face.
  • the pressure force applied to the valve piece via the valve clamping screw is divided into an axially acting first force component and a radially acting second force component. While the axially acting first force component serves to fix the position of the valve piece in the holding body of the fuel injector, it is possible via the radially acting second force component to bring about a prestressing of the valve piece which increases the strength. Because the bias induces compressive stresses in the valve piece, which are able to compensate for tensile stresses that occur especially in high-pressure load of the valve member in the field of drain throttle. Thus, the high pressure resistance of the valve piece of the control valve increases, so that it can be used at higher system pressures than currently available. Alternatively or additionally, a less expensive material can be used for producing the valve piece, since a failure is no longer to be feared, at least at the currently prevailing system pressures.
  • a division into an axial first and a second radial force component is also achievable when the valve clamping screw is indirectly supported via a pressure ring on the valve piece. Therefore, the pressure ring also contributes to an increase in the strength of the valve piece, so that an increase in the system pressure and / or the use cheaper materials is possible or are. In addition, the pressure ring ensures a uniform power transmission.
  • the pressure ring is triangular or trapezoidal in cross-section.
  • the pressure ring has at least two side surfaces which enclose an angle which is less than 90 °. Further preferably, this is an outer peripheral surface and an end face, which faces the sloping shoulder of the valve piece.
  • Such a pressure ring is simple and inexpensive to produce.
  • the pressure ring has a flat first contact surface for supporting the valve clamping screw and an inclined second abutment surface for support on the shoulder of the valve piece, wherein preferably the inclined second abutment surface is inclined at an angle relative to a radial plane substantially corresponds to the inclination angle of the radially outwardly inclined sloping shoulder of the valve member relative to the radial plane.
  • the inclined second contact surface of the pressure ring relative to the radial plane is inclined at an angle which is 5 ° to 45 °, preferably 7 ° to 40 °, more preferably 10 ° to 30 °. It is true that with increasing angle and the force acting in the radial direction force component of the pressure generated via the valve clamping screw increases. If the angle, as in the present case, is preferably less than 45 °, it is ensured that the axial force component is greater than the radial force component. On the one hand, this is necessary in order to effect a sufficient fixing of the position of the valve piece in the holding body. On the other hand, at the same time a sealing of a high-pressure area via the axially acting force component the fuel injector can be achieved with respect to a low-pressure region, if this is sufficiently large.
  • the radially outwardly sloping shoulder is formed on a plate-shaped portion of the valve piece.
  • the valve member is supported on a radially extending shoulder of the holding body of the fuel injector, so that via the valve clamping screw a compressive force is exerted on the valve piece having an axially acting first force component for the axial bias of the valve piece in the direction of the radially extending paragraph and a comprises radially acting second force component.
  • the radially acting second force component causes a bias of the valve piece, which acts to increase strength. Because of the bias a relief of the strength-critical areas of the valve piece is effected. These areas include in particular the area in which the outlet throttle is formed.
  • annular surface is preferably formed on the side of the plate-shaped portion of the valve piece facing away from the valve clamping screw.
  • the formation of a plate-shaped portion requires an enlarged outer diameter, which also acts to increase strength.
  • a diffuser is formed in the valve piece between the outlet throttle and a valve seat.
  • the diffuser may be formed immediately downstream of the outlet throttle in the flow direction of the outflowing fuel.
  • the outlet throttle can open into the valve seat via the diffuser.
  • the diffuser is used for flow optimization.
  • the outlet throttle, the valve seat and / or the diffuser is or are arranged in the region of the plate-shaped portion of the valve piece.
  • the outlet throttle, the valve seat and / or the diffuser preferably come to lie in a portion of the valve piece or, which by the bias on the directly or indirectly supported on the sloping shoulder valve clamping screw a higher Has strength.
  • This is advantageous insofar as the outlet throttle, the valve seat and / or the diffuser, if present, weaken the valve piece. However, this weakening is compensated by the bias.
  • the valve piece has a hollow cylindrical portion for forming and limiting a control chamber, which is relieved via the outlet throttle, the valve seat and / or the diffuser.
  • the control pressure in the control room is controlled.
  • the control pressure in the control chamber can influence the axial position of the injection valve member of the fuel injector.
  • an end portion of a liftable injection valve member is received in the hollow cylindrical portion of the valve piece, via the lifting movement of which at least one injection opening of the fuel injector is releasable or closable.
  • the control valve can be used in this case for controlling the lifting movement of the injection valve member of the fuel injector.
  • control valve when the control valve is open, the control chamber is relieved via the outlet throttle, so that a pressure drop relieving the injection valve member in the control chamber is effected.
  • the Indian Fig. 1 shown fuel injector comprises a control valve with a valve piece 2, which has a plate-shaped portion 12, via which the valve member 2 is supported on a radially extending shoulder 13 of a holding body 1 of the fuel injector.
  • a sloping sloping shoulder 5 is formed radially outside, on which indirectly via a pressure ring 8, a valve clamping screw 4 is supported, which is screwed to fix the position of the valve member 2 in the holding body 1.
  • the valve clamping screw 4 exerts indirectly via the pressure ring 8 a compressive force on the valve piece 2, which not only has an axially acting force component in the direction of paragraph 13 due to the sloping shoulder 5, but also a radially acting force component.
  • the latter causes a bias of the valve piece 2 in the radial direction, which in turn leads to an increase in the strength in a strength-critical area of the valve piece 2, in the present case, a discharge throttle 3 and a diffuser 15 are formed.
  • a discharge throttle 3 and a diffuser 15 are formed.
  • high local tensile stresses resulting from the tightening torque of the valve clamping screw 4 and / or from the load of the valve member 2 with system pressure.
  • the radial preload helps to compensate for these tensile stresses.
  • the inserted between the valve piece 2 and the valve clamping screw 4 pressure ring 8 is triangular in cross-section, so that a radially extending first contact surface 9 for abutment of a flat end face 6 of the valve clamping screw 4 and an inclined second contact surface 10 for support on the sloping shoulder 5 of the valve piece 2 are formed.
  • the inclined contact surface 10 is - according to the sloping shoulder 5 of the valve piece 2 - inclined at an angle of 45 ° relative to a radial plane 11 (see also Fig. 2 ).
  • a pressure ring 8 is enlarged in the Fig. 3 shown. In contrast to the pressure ring 8 here is the angle ⁇ ⁇ 45 °, that is flattened. The use of such a pressure ring As a result, the axial force component applied via the valve clamping screw 4 is greater than the force component acting in the radial direction.
  • control valve is a hollow cylindrical portion 16 attached to the plate-shaped portion 12 of the valve member 2, in which an end portion of an injection valve member 18 is received and guided.
  • the valve piece 2 and the injection valve member 18 together define a control chamber 17 which can be relieved via the outlet throttle 3 formed in the valve piece 2 (see FIG Fig. 1 ).
  • the outlet throttle 3 is formed in a flow channel 19, which connects the outlet throttle 3 with the control chamber 17.
  • the diffuser 15 connects (see Fig. 1 ).
  • a further hollow cylindrical portion 22 is attached, which in the present case, the leadership of a cooperating with a valve seat 14 lifting armature 20 is used.
  • the armature 20 is axially biased in the direction of the valve seat 14. If now an electromagnet 21 of the control valve is energized, a magnetic field is formed whose magnetic force lifts the armature 20 out of the valve seat 14, so that the control valve opens.
  • the result of the opening of the control valve is that fuel flows out of the control chamber 17 via the outlet channel 19, the outlet throttle 3, the diffuser 15 and the valve seat 14, so that the pressure in the control chamber 17 drops.
  • the injection valve member 18 of the fuel injector is relieved in this way and is able to open.
  • Fig. 4 is a further preferred embodiment of a fuel injector according to the invention can be seen.
  • the valve tightening screw 4 is supported directly on the obliquely sloping shoulder 5 of the valve piece 2 via an annular edge 7 that radially delimits the flat end 6.
  • the edge 7 forms a kind of biting edge, which is limited plastically deformable in order to ensure a uniform contact of the valve clamping screw 4 at the sloping shoulder 5 of the valve piece 2.
  • the outlet throttle 3 opens on the one hand directly into the control chamber 17, on the other hand into the diffuser 15.
  • the diffuser 15 opens in the direction of the valve seat 14.

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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP15192569.0A 2014-12-09 2015-11-02 Injecteur de carburant Not-in-force EP3032085B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014225293.8A DE102014225293A1 (de) 2014-12-09 2014-12-09 Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP3032085A1 true EP3032085A1 (fr) 2016-06-15
EP3032085B1 EP3032085B1 (fr) 2019-01-09

Family

ID=54365148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15192569.0A Not-in-force EP3032085B1 (fr) 2014-12-09 2015-11-02 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP3032085B1 (fr)
DE (1) DE102014225293A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019179976A1 (fr) * 2018-03-23 2019-09-26 Robert Bosch Gmbh Injecteur de carburant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001079689A2 (fr) * 2000-04-14 2001-10-25 Siemens Aktiengesellschaft Soupape d'injection presentant une geometrie des surfaces optimisees entre un corps de buse et un ecrou de serrage
DE102004047090A1 (de) * 2004-09-29 2006-03-30 Robert Bosch Gmbh Magnetventil zur Steuerung eines Einspritzventils einer Verbrennungskraftmaschine
DE102006021736A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102008005523A1 (de) * 2008-01-23 2009-07-30 Robert Bosch Gmbh Kraftstoffinjektor
DE202008009036U1 (de) * 2008-07-04 2009-11-12 Robert Bosch Gmbh Ventilspannmutter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001079689A2 (fr) * 2000-04-14 2001-10-25 Siemens Aktiengesellschaft Soupape d'injection presentant une geometrie des surfaces optimisees entre un corps de buse et un ecrou de serrage
DE102004047090A1 (de) * 2004-09-29 2006-03-30 Robert Bosch Gmbh Magnetventil zur Steuerung eines Einspritzventils einer Verbrennungskraftmaschine
DE102006021736A1 (de) 2006-05-10 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit druckausgeglichenem Steuerventil
DE102008005523A1 (de) * 2008-01-23 2009-07-30 Robert Bosch Gmbh Kraftstoffinjektor
DE202008009036U1 (de) * 2008-07-04 2009-11-12 Robert Bosch Gmbh Ventilspannmutter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019179976A1 (fr) * 2018-03-23 2019-09-26 Robert Bosch Gmbh Injecteur de carburant

Also Published As

Publication number Publication date
EP3032085B1 (fr) 2019-01-09
DE102014225293A1 (de) 2016-06-09

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