EP3018335A1 - Injecteur de carburant et procede de fabrication d'un injecteur de carburant - Google Patents

Injecteur de carburant et procede de fabrication d'un injecteur de carburant Download PDF

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Publication number
EP3018335A1
EP3018335A1 EP15190117.0A EP15190117A EP3018335A1 EP 3018335 A1 EP3018335 A1 EP 3018335A1 EP 15190117 A EP15190117 A EP 15190117A EP 3018335 A1 EP3018335 A1 EP 3018335A1
Authority
EP
European Patent Office
Prior art keywords
valve piece
valve
fuel injector
clamping element
clamping
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
EP15190117.0A
Other languages
German (de)
English (en)
Other versions
EP3018335B1 (fr
Inventor
Lars Olems
Philipp Schott
Thomas Nierychlo
Axel Schnaufer
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 EP3018335A1 publication Critical patent/EP3018335A1/fr
Application granted granted Critical
Publication of EP3018335B1 publication Critical patent/EP3018335B1/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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8061—Fuel injection apparatus manufacture, repair or assembly involving press-fit, i.e. interference or friction fit
    • 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
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members

Definitions

  • the invention relates to a fuel injector, in particular a common rail injector for self-igniting internal combustion engines, according to the preamble of claim 1. Furthermore, the invention relates to a method for producing a fuel injector according to the invention.
  • a fuel injector according to the preamble of claim 1 is known from DE 10 2012 224 226 A1 the applicant known.
  • a valve piece is clamped by means of a valve clamping screw axially against a shoulder of a holding body.
  • the valve piece include a control room and, starting from the bottom of the control room, a drain hole with outlet throttle and drain diffuser arranged.
  • a drain hole with outlet throttle and drain diffuser arranged in addition, opens into the control chamber formed in the wall of the valve piece, an inlet throttle having inlet bore.
  • the control chamber in which the end portion of a nozzle needle dips serves in a known manner to control the movement of the nozzle needle by closing or releasing the drain hole in the direction of a low pressure region by means of an actuator.
  • valve piece Due to the steadily increasing system pressures in auto-ignition internal combustion engines, it is necessary to tighten the valve piece with a relatively large axial clamping force against the retaining shoulder of the holder body to ensure the tightness of the fuel injector. Due to the geometry of the valve piece and the arrangement of the valve clamping screw to the valve piece both areas with compressive stresses and those with tensile stresses are generated during clamping in the valve piece. In the case of the fuel injector known from the cited document, in which the outlet throttle or the outlet diffuser lies approximately at the level of an end face in which the valve clamping screw bears against the valve piece, relatively high tensile stresses occur in the region of the outlet throttle and the outlet diffuser. the have a significant negative impact on the fatigue strength of the valve piece.
  • a radially outer element comprises a radially inner element forming an interference fit, so that radially acting compressive stresses are generated in the radially inner element, which counteract the pressure stresses in the radially inner element caused by the system pressure in the injector housing.
  • the invention has the object, a fuel injector according to the preamble of claim 1 such that the fatigue strength of the valve piece is improved.
  • valve member is at least partially radially surrounded by a clamping element which is adapted to generate a radially acting pressure force on the valve piece.
  • clamping element compressive stresses are generated in the valve member, which can be used in response to the position of the clamping element to counteract the tensile stresses occurring during assembly of the valve member in the holding body during axial clamping of the valve member or to reduce these.
  • the outer diameter of the valve piece is larger than the inner diameter of the clamping element, such that in the assembled state between the valve piece and the clamping element a press fit is formed.
  • the clamping element in which this can be manufactured in manufacturing technology particularly simple manner and at the same time over the circumference of the valve piece considered equal pressure forces generated, it is provided that the clamping element is sleeve-shaped with preferably constant wall thickness.
  • the clamping element in the installed state is arranged axially spaced from the valve clamping screw and the holding body. As a result, the clamping element does not come into contact with the holding body or the valve clamping screw during the axial clamping of the valve piece, so that no forces possibly influencing the compressive stresses are transmitted to the clamping element via these elements.
  • the clamping element is received with radial play within the holding body.
  • the coefficient of thermal expansion of the valve piece is equal to or greater than the thermal expansion coefficient of the clamping element. In other words, this means that with a warming of the valve piece and the clamping element, the valve piece always expands more than the clamping element, so that the radial compressive forces of the clamping element on the valve piece even increased and reduced in any case.
  • the invention also includes a method for producing a fuel injector according to the invention.
  • This method is inventively characterized in that cooled before joining the valve piece and / or the clamping element is heated / is.
  • the two joining partners can be axially without the risk of mechanical damage to the joining partners into each other or add with relatively little axial force.
  • the valve piece is clamped axially in the holding body by means of the valve clamping screw.
  • This preferred method has the advantage that the axial clamping of the valve piece in the holding body takes place only in a state in which the desired radial compressive stresses have been generated via the clamping element in the valve piece.
  • the Indian Fig. 1 shown fuel injector 10 is part of a common rail injection system, in particular for self-igniting internal combustion engines, and has an injector 11 with a holding body 12.
  • a high-pressure inlet 14 which is connected via a fuel line, not shown, with a fuel reservoir (rail).
  • a valve member 16 is inserted, in which partially an injection valve member 18 in the form of a nozzle needle or a push rod, which actuates a lower lying injection valve member, is added.
  • a control chamber 20 is formed, which is acted upon via an inlet throttle 22 of the entering from the high-pressure inlet 14 and under system pressure fuel.
  • the injection valve member 18 serves to close or release in the Fig. 1 injection openings, not shown.
  • the control chamber 20 in the valve piece 16 is depressurized via a drain hole 24 in a low pressure region or in a fuel return.
  • a drain hole 24 In the drain hole 24 is below an opening formed as a diffuser 25, i. below a valve seat 28, an outlet throttle 26.
  • the valve seat 28 of the drain hole 24 is closed in the region of the diffuser 25 by a spherical closing element 30.
  • the fuel injector 10 is exemplified, and not by way of limitation, actuated by a solenoid valve.
  • a magnet assembly of the solenoid valve includes an armature 32 which is radially guided in an armature guide 36 with play.
  • the armature guide 36 is in turn partially surrounded by a valve clamping screw 50, with which the valve member 16 is clamped in the holder body 12 axially against a formed in the holding body 12 retaining shoulder 13.
  • the armature 32 has a flat end face 34, which is arranged opposite a likewise flat end face 40 of a magnetic core 38.
  • the magnetic core 38 comprises a magnetic coil 42 radially.
  • the magnet assembly which comprises the magnet core 38, the magnet coil 42 and the armature 32, is radially encompassed by a magnet sleeve 44, which is screwed by means of a clamping nut 48 on the holding body 12. Furthermore, in the Fig. 1 recognizable that the armature 32 is acted upon by an armature spring 46 which presses the armature 32 in the valve seat 28.
  • valve seat 28 Upon energization of the magnetic coil 42 accommodated in the magnetic core 38, the valve seat 28 is opened by tightening the armature 32 and thus an outflow of fuel from the control chamber 20 via the drainage bore 24 into the mentioned low-pressure region of the fuel injector 10 or into the fuel return.
  • the valve piece 16 has on the side facing the retaining shoulder 13 on its periphery an inclined chamfer 15. Furthermore, the valve piece 16 forms on the valve clamping screw 50 facing end side at least in the region of the valve clamping screw 50 flat end face 51.
  • the diffuser 25 and the outlet throttle 26 are, viewed in the axial direction, arranged approximately at the level or slightly below the end face 51 of the valve piece 16. During axial clamping of the valve member 16 against the retaining shoulder 13 of the holding body 12 by means of the valve clamping screw 26 tensile stresses are generated in the region of the diffuser 25 and the outlet throttle 26, which can be at least partially reduced or equalized by the now described, inventive design of the fuel injector 10.
  • valve member 16 at least partially, in the illustrated embodiment, approximately between the region of the end face 51 of the valve member 16 and the chamfer 15 is surrounded by a clamping element 55 which generates a radially acting pressure force on the valve member 16, which In the area of the outlet throttle 26 and the diffuser 25 prevailing tensile stresses reduced.
  • a press fit is formed between the outer diameter of the valve piece 16 and the inner diameter of the clamping element 55.
  • the clamping element 55 is sleeve-shaped with preferably constant wall thickness. Furthermore, it is provided in the installed state of the clamping element 55, that between the clamping element 55 and the holding body 12, a radially encircling space 57 is formed.
  • the valve member 16 is cooled down and / or the clamping member 55 is heated / is.
  • the heating or cooling down of the addressed components serves to reduce the differences in diameter between the outer diameter of the valve piece 16 and the inner diameter of the clamping element 55 in the joining region, to a subsequent axial joining of the components avoid mechanical damage to the components.
  • a second step 62 it is preferably provided after joining the components, in a second step 62 by a waiting time to achieve an approximation of the temperatures of the valve member 16 and the clamping member 55, whereby the clamping member 55 shrinks or expands the valve member 16 in the joint area.
  • the desired compressive stresses in the joining region between the valve piece 16 and the clamping element 55 are generated.
  • a third step 63 it is provided to insert the assembly formed from the valve piece 16 and the clamping element 55, possibly together with other components, into the holding body 12 and to clamp it axially against the holding shoulder 13 of the holding body 12 by means of the valve clamping screw 50, to ensure the desired tightness of the injector 11.

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)
EP15190117.0A 2014-11-07 2015-10-16 Injecteur de carburant et procede de fabrication d'un injecteur de carburant Not-in-force EP3018335B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014222815.8A DE102014222815A1 (de) 2014-11-07 2014-11-07 Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors

Publications (2)

Publication Number Publication Date
EP3018335A1 true EP3018335A1 (fr) 2016-05-11
EP3018335B1 EP3018335B1 (fr) 2017-08-16

Family

ID=54359791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15190117.0A Not-in-force EP3018335B1 (fr) 2014-11-07 2015-10-16 Injecteur de carburant et procede de fabrication d'un injecteur de carburant

Country Status (2)

Country Link
EP (1) EP3018335B1 (fr)
DE (1) DE102014222815A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108223222A (zh) * 2018-03-28 2018-06-29 南岳电控（衡阳）工业技术股份有限公司 一种降低计量伺服阀变形的燃油喷油器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120152206A1 (en) * 2010-12-17 2012-06-21 Denso Corporation Fuel injection device
EP2626546A1 (fr) * 2012-02-07 2013-08-14 Robert Bosch GmbH Liaison de filetage de composants guidant un milieu haute pression d'un dispositif d'injection pour moteurs à combustion
DE102012224226A1 (de) 2012-12-21 2014-06-26 Robert Bosch Gmbh Kraftstoffinjektor
DE102013226569A1 (de) 2013-12-19 2015-06-25 Robert Bosch Gmbh Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120152206A1 (en) * 2010-12-17 2012-06-21 Denso Corporation Fuel injection device
EP2626546A1 (fr) * 2012-02-07 2013-08-14 Robert Bosch GmbH Liaison de filetage de composants guidant un milieu haute pression d'un dispositif d'injection pour moteurs à combustion
DE102012224226A1 (de) 2012-12-21 2014-06-26 Robert Bosch Gmbh Kraftstoffinjektor
DE102013226569A1 (de) 2013-12-19 2015-06-25 Robert Bosch Gmbh Kraftstoffinjektor und Verfahren zum Herstellen eines Kraftstoffinjektors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108223222A (zh) * 2018-03-28 2018-06-29 南岳电控（衡阳）工业技术股份有限公司 一种降低计量伺服阀变形的燃油喷油器

Also Published As

Publication number Publication date
DE102014222815A1 (de) 2016-05-12
EP3018335B1 (fr) 2017-08-16

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