EP2252786B1 - Traversée électrique étanchéifiée - Google Patents

Traversée électrique étanchéifiée Download PDF

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Publication number
EP2252786B1
EP2252786B1 EP08873402A EP08873402A EP2252786B1 EP 2252786 B1 EP2252786 B1 EP 2252786B1 EP 08873402 A EP08873402 A EP 08873402A EP 08873402 A EP08873402 A EP 08873402A EP 2252786 B1 EP2252786 B1 EP 2252786B1
Authority
EP
European Patent Office
Prior art keywords
magnet
sleeve
sealing
fuel injector
contact
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.)
Not-in-force
Application number
EP08873402A
Other languages
German (de)
English (en)
Other versions
EP2252786A1 (fr
Inventor
Holger Rapp
Helmut Clauss
Friedrich Howey
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 EP2252786A1 publication Critical patent/EP2252786A1/fr
Application granted granted Critical
Publication of EP2252786B1 publication Critical patent/EP2252786B1/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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • DE 196 50 865 A1 refers to a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, such as a common rail injection system, for supplying fuel to self-igniting internal combustion engines. About the fuel pressure in the control chamber, a stroke movement of a valve body is controlled with an injection port of the injection valve is opened or closed.
  • the solenoid valve comprises an electromagnet, a movable armature and a valve member moved with the armature and acted upon by a valve closing spring in the closing direction and cooperating with the valve seat of the valve member to control the fuel output from the control chamber.
  • the bushings are sealed with an O-ring joined to the coil pins.
  • These O-rings are first pushed over the coil pins and then inserted with the coil pins from below into the corresponding bore of the sleeve. They come under radial stress and seal both with respect to the bore wall and against the pin jacket surface safely.
  • the hole is tapered upwards. This can be achieved either via a step or via a conical bore shape.
  • the coil pin is encapsulated in its lower part with plastic, which forms a so-called "dome” above the Spulenumspritzung and also avoids touching the coil pins with the magnetic core.
  • the sleeve Since the magnetic core is usually supported on a shoulder in the sleeve, the sleeve has hitherto been made in two parts, i. from an actual sleeve and from a drain neck.
  • the magnetic core with coil was first inserted from above into the sleeve until it rested on the shoulder. Then the drain neck was placed on top and held down with a defined force. Thereafter, discharge spout and sleeve were crimped together and thereby fixed the magnet in its position.
  • the feedthroughs of the coil pins were incorporated in this case in the outlet pipe. If the sleeve is to be made in one piece in a cost effective manner, this has the consequence that the magnetic core must be inserted from below into the sleeve.
  • the inner contour of the sleeve and the outer contour of the core are not rotationally symmetrical, but have a radial contour.
  • the core is inserted from below into the sleeve in an angular position in which sleeve and core do not overlap when viewed from below. Between core and sleeve there is a spring element which is suppressed with a defined mounting force. If the magnetic core is inserted so deeply into the magnet sleeve that its end face is located above the associated bearing surface in the sleeve, the core is rotated by a defined angle (for example 45 °) with respect to the sleeve. As a result, the areas of large outer diameter of the core interact with those small inner diameters of the support surface. When removing the mounting force, these areas are based on each other, so that the core is now fixed in the sleeve.
  • the magent coil may not yet be mounted in the magnetic core, but may only be joined to the magnet core from below after mounting and aligning it. Since the outer diameter of the O-rings is larger than the recess for the pin dome in the magnetic core, the solenoid can only be mounted without O-rings. Alternatively, it is possible to perform the sealing of the bushings not with O-rings, but these bushings after Pour out the assembly of the complete magnet assembly with adhesive and seal in this way. However, this variant involves some risks that are critical in view of the error sequence, such as the outward leakage of fuel: Although the adhesive initially filled in the liquid state, the entire space between the sleeve and pin, but then hardens.
  • a reliably functioning sealing of the feedthroughs of electrical contacting pins from the housing of the fuel injector can be realized without recourse to an adhesive variant which involves the risks listed above.
  • a sealing element made of elastic material can be vulcanized into the leadthrough hole for the contacting pin for electrical contacting of the magnetic coil.
  • the inner diameter of the vulcanized sealing element is smaller than the diameter of the Kunststoff Industriesspins for electrical contacting of the magnetic coil.
  • This bias in the radial direction also causes a self-sealing of the guided through the magnet sleeve outward Kunststofftechnikspins, so that the tightness is guaranteed even if the built-up at the molecular level connection between the sealing element and magnetic sleeve surface disappears over time. Possible causes for this are temperature changes and occurring mechanical stress.
  • the tightness is ensured by the radial bias of the vulcanized sealing element and not - as in the introduced adhesive - purely by the chemical bond between the surfaces of the sealing element and the surfaces of the magnet sleeve and the Kunststofftechnischspins. This achieves the safe representation of the seal over the entire product duration.
  • the vulcanized-in sealing elements not be designed with a small inner opening, but consistently.
  • the thickness in the center is smaller than the thickness outside, and the sealing elements are designed such that the sealing element can be pierced there by the contacting pin of the magnetic coil with a small axial force.
  • the sealing elements are pierced at these thinned points and biased in the sequence thereof in the radial direction, so that they also seal to the electrical Kunststoffspins the solenoid out.
  • FIG. 1 there is a group of magnets which includes a solenoid and is sealed outwardly in two different ways to prevent the escape of fuel from a fuel injector.
  • FIG. 1 shows in section a magnet group 10, which is accommodated in a magnetic sleeve 12 formed integrally here.
  • the magnet sleeve 12 and the magnet group 10 are symmetrical to an injector axis 14 of an in FIG. 1 formed fuel injector, not shown.
  • the magnet group 10 of the fuel injector is actuated, that causes a pressure relief of a system under pressure control chamber.
  • the magnet sleeve 12 has a return 16, to which on the outside of the lateral surface 12, a return port 18 is aligned.
  • the magnet group 10 essentially comprises a magnetic core 20 and a magnetic coil 22 embedded in the magnetic core 20 FIG. 1 not shown anchor assembly assigning end face of the magnetic core 20 is shown in the illustration FIG. 1 designated by reference numeral 24.
  • the magnetic coil 22 of the magnetic group 10 is electrically connected via a Kunststofftechnikspin 28.
  • the contacting pin 28 can - as in FIG. 1 shown in the left half - sealed by an O-ring 32.
  • the O-ring 32 is inserted into a passage 30 and employed by a plastic dome 36 to a shoulder of the magnet sleeve 12.
  • this solution requires that the magnetic coil 22 must be moved during assembly in the magnetic head only in the axial direction and that the O-rings 32 are already pre-assembled on the coil pins.
  • the contacting pin 28 is sealed to energize the magnetic coil 22 within the magnetic core 20 via a Klebstoffpfropfen 40.
  • the adhesive in the passage 30 is flowable, this penetrates into all the pores or small gaps of the magnetic sleeve 12 and seals them to the outside of the magnetic sleeve 12 back.
  • microcracks may occur due to mechanical stresses and thermal expansions, which allow the escape of fuel from the low-pressure region 38 to the outside of the magnet group 10.
  • FIG. 2 The representation according to FIG. 2 is the view of a magnet assembly 10 can be seen from the bottom.
  • FIG. 2 shows, the magnetic sleeve 12 - see.
  • Representation according to FIG. 1 - Along a circumference of a mounting hole a number of attacks 42. These attacks 42 are formed in the radial direction so that they exceed the diameter of the magnetic core 20 to be mounted.
  • the insertion of the magnet core 20 into the magnet sleeve 12 is followed by a rotation 56 of the magnet core 20 in the clockwise direction 56, as a result of which the wing-shaped projections on the circumference of the magnet core 20 are overlapped with overlaps 42 (cf. FIG. 1 ) of the magnetic sleeve 12 are brought.
  • the spring element 26 designed as a plate spring, the magnetic core 20 is pressed against the radial projections of the magnet sleeve 12 -without a magnet coil 22.
  • the magnetic coil 22 has the Kunststoffssenspins 28 to be contacted electrically, which the bushings 30 -. Representation according to FIG. 1 - Pass and be contacted on the outside of the magnet sleeve 12 of the magnet group 10 electrically.
  • connector lugs are preferably used, which are welded to the Kunststofftechnischspins 28, soldered or electrically connected in some other way.
  • a seal in this solution using O-rings 32 would be only then possible if the magnetic core 20 have passages which are larger than the outer diameter of the mounted on a coil pin 28 O-ring 32.
  • Such large recesses in the magnetic core 20, however, are counterproductive to achieve the desired magnetic force and therefore to avoid as far as possible.
  • a vulcanized sealing element 34 is received in the magnet sleeve 12 in the region of the passage 30.
  • the vulcanized sealing element 64 is preferably vulcanized in the context of a diameter transition of the bushing 30 against the paragraph resulting from the diameter transition and fixed in this manner within the bushing 30.
  • An outer side of the magnet sleeve 12 is designated by reference numeral 62, while an inner side 60, ie the side of the magnetic sleeve 12 facing the low-pressure region 38, is designated by reference numeral 60.
  • the inner diameter of the inner opening 66 is dimensioned to be smaller than the outer diameter of the Kunststofftechnikspins 28 through which the magnetic coil 22 of the magnetic group 10 is electrically contacted after mounting in the magnet sleeve 12.
  • vulcanized sealing element 64 comprises sealing lips 68, which nestle sealingly on the lateral surface 36 during assembly of the contacting pin 28.
  • the sealing element 64 vulcanized into the bushing 30 rests against a shoulder defined by a diameter jump of the bushing 30 and is consequently secured in the axial direction - with respect to the insertion direction of the contacting pins 28 - and positioned in the defined position. If the contacting pins 28 are inserted into the sealing element 64 vulcanized into the magnet sleeve 12, the sealing lips 68 are widened radially so that they conform to the lateral surface 76 of the contacting pins 28 of the magnet coil 22 along a sealing length 72. Depending on the length of the sealing length 72 is a seal of in FIG. 1 achieved low pressure range 38 of a fuel injector.
  • the inside of the magnetic sleeve 12, that is, the region which is filled by fuel under low pressure with reference numeral 62, an outer side of the magnet sleeve 12 is designated.
  • a leakage of fuel from the low pressure region 38 to the outside is absolutely to prevent.
  • the contacting pin 28 as shown in FIG Figure 3.2 is symmetrical to the axis 78 of the Needles istspins 28 executed.
  • Reference numeral 74 designates the sealing lips 68 of the sealing element 12 vulcanized into the magnetic sleeve 12 in the deformed state, that is to say in the state applied to the lateral surface 76 of the contacting pin 28.
  • Figure 4.1 and Figure 4.2 show a variant of the inventively proposed vulcanized sealing element.
  • vulcanized sealing element 64 differs from the embodiment according to the Figures 3.1 and 3.2 in that it is designed in a first thickness 80 and a second, reduced thickness 82.
  • the sealing element 64 vulcanized into the magnet sleeve 12 has a funnel-shaped insertion bevel 84.
  • the second, reduced thickness 82 is present in the center of the substantially rotationally symmetrical vulcanized sealing element 64
  • the vulcanized sealing element according to the embodiments in FIG Figures 4.1 and 4.2 formed in the first thickness 80 in the region in which it rests in a diameter jump of the bushing 30 of the magnet sleeve 12.
  • the first thickness 80 exceeds the second, reduced thickness 82 of the vulcanized sealing element 64 by at least two times.
  • Figure 4.2 shows the assembled state of the Kunststoff musclesspins.
  • sealing contact pins 28 may also be applied to the sealing of other electrical leads, e.g. the supply lines of currently unclaimed piezoelectric actuators or sensors.

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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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (7)

  1. Injecteur de carburant comprenant un groupe magnétique (10), un noyau magnétique (20) et une bobine magnétique (22), le groupe magnétique (10) étant reçu dans une douille magnétique (12) qui présente des traversées (30) pour des broches de contact électriques (28) de la bobine magnétique (22), des éléments d'étanchéité élastiques (64) étant vulcanisés dans les traversées (30) de telle sorte que les broches de contact (28) de la bobine magnétique (22) dans l'état monté soient sollicitées par une force de précontrainte radiale (70) pour réaliser l'étanchéité, caractérisé en ce que les éléments d'étanchéité (64) sont réalisés dans une première épaisseur (80) et, en leur centre, dans une deuxième épaisseur réduite (82), et en ce que les éléments d'étanchéité (64) présentent, dans la région de la deuxième épaisseur réduite (82), un biseau d'insertion (84) qui est traversé par les broches de contact (28) lors du montage de celles-ci dans la douille magnétique (12).
  2. Injecteur de carburant selon la revendication 1, caractérisé en ce que les éléments d'étanchéité élastiques (64) sont vulcanisés dans un décrochement au niveau duquel est réalisé un saut de diamètre intérieur des traversées (30).
  3. Injecteur de carburant selon la revendication 1, caractérisé en ce que les éléments d'étanchéité élastiques (64) sont réalisés avec une symétrie de révolution et présentent des lèvres d'étanchéité (68) qui s'appliquent dans l'état monté des broches de contact (28) contre leur surface d'enveloppe (76).
  4. Injecteur de carburant selon la revendication 3, caractérisé en ce que les lèvres d'étanchéité (68) s'appliquent dans l'état dévié par les broches de contact (28) le long d'une longueur d'étanchéité (72) contre la surface d'enveloppe (76) des broches de contact (28) et étanchéifient la traversée (30) de la douille magnétique (12).
  5. Injecteur de carburant selon la revendication 4, caractérisé en ce que la longueur d'étanchéité (72) correspond essentiellement au diamètre de l'élément d'étanchéité (64).
  6. Injecteur de carburant selon la revendication 1, caractérisé en ce que les éléments d'étanchéité (64) - vus dans la direction de perçage des broches de contact (28) - s'appliquent contre un décrochement de la traversée (30) dans la douille magnétique (12).
  7. Injecteur de carburant selon la revendication 1, caractérisé en ce que le noyau magnétique (20) est transféré dans la douille magnétique (12) dans l'état monté dans une deuxième position angulaire (54) et est incliné par un élément de ressort (26) contre des saillies radiales (72) de la douille magnétique (12).
EP08873402A 2008-03-19 2008-12-05 Traversée électrique étanchéifiée Not-in-force EP2252786B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000753A DE102008000753A1 (de) 2008-03-19 2008-03-19 Abgedichtete elektrische Durchführung
PCT/EP2008/066893 WO2009115150A1 (fr) 2008-03-19 2008-12-05 Traversée électrique étanchéifiée

Publications (2)

Publication Number Publication Date
EP2252786A1 EP2252786A1 (fr) 2010-11-24
EP2252786B1 true EP2252786B1 (fr) 2013-04-03

Family

ID=40493912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08873402A Not-in-force EP2252786B1 (fr) 2008-03-19 2008-12-05 Traversée électrique étanchéifiée

Country Status (6)

Country Link
US (1) US20110006137A1 (fr)
EP (1) EP2252786B1 (fr)
JP (1) JP5238065B2 (fr)
CN (1) CN101978157B (fr)
DE (1) DE102008000753A1 (fr)
WO (1) WO2009115150A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104821209B (zh) * 2015-05-04 2017-03-01 特乐斯特机械(上海)有限公司 电缆终端密封装置
JP2020089223A (ja) * 2018-11-30 2020-06-04 日本電産株式会社 モータ、および電動ホイール
JP2020089224A (ja) * 2018-11-30 2020-06-04 日本電産株式会社 モータ、および電動ホイール
CN111641118B (zh) * 2020-06-15 2021-12-31 东营金丰正阳科技发展有限公司 一种防尘配电箱
US11820474B2 (en) * 2020-10-14 2023-11-21 Aqua Satellite, Inc. Feedthroughs for enclosures in deep water vessels

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3456232A (en) * 1967-07-13 1969-07-15 Burndy Corp Self-sealing connector
US4711397A (en) * 1982-01-11 1987-12-08 Essex Group, Inc. Electromagnetic fuel injector having continuous flow path
JPH01176619A (ja) * 1987-12-29 1989-07-13 Aisin Seiki Co Ltd センサの防水構造
US5244180A (en) * 1992-09-03 1993-09-14 Siemens Automotive L.P. Solenoid pre-loader
DE4242238C2 (de) * 1992-12-15 2001-02-15 Bosch Gmbh Robert Dichtring für einen in eine Öffnung eines Gehäuses ragenden Stift
DE4412277A1 (de) * 1994-04-09 1995-10-12 Bosch Gmbh Robert Elektromagnetisch betätigbares Brennstoffeinspritzventil
DE19650865A1 (de) 1996-12-07 1998-06-10 Bosch Gmbh Robert Magnetventil
DE10027662A1 (de) * 2000-06-03 2001-12-06 Bosch Gmbh Robert Dichtmittel und Niederhalter für ein Brennstoffeinspritzventil
DE502004004656D1 (de) * 2004-08-20 2007-09-27 Siemens Ag Abdichtungsanordnung eines Piezoaktors eines Kraftstoffinjektors
DE102004063293B4 (de) * 2004-12-29 2010-07-08 Continental Automotive Gmbh Kraftstoffinjektor für eine Brennkraftmaschine
JP2007064076A (ja) * 2005-08-30 2007-03-15 Toyota Motor Corp 内燃機関の燃料噴射装置
ATE479018T1 (de) * 2006-06-15 2010-09-15 Fiat Ricerche Brennstoffeinspritzventil
DE102006029966B4 (de) * 2006-06-29 2010-04-22 Continental Automotive Gmbh Abdichtungsanordnung eines Piezoaktors für ein Kraftstoffeinspritzventil einer Brennkraftmaschine
FR2909137B1 (fr) * 2006-11-24 2009-02-27 Electricfil Automotive Soc Par Dispositif d'assemblage pour un actionneur electromagnetique d'un injecteur pour moteur a combustion interne.

Also Published As

Publication number Publication date
EP2252786A1 (fr) 2010-11-24
DE102008000753A1 (de) 2009-09-24
JP5238065B2 (ja) 2013-07-17
JP2011514478A (ja) 2011-05-06
CN101978157B (zh) 2013-06-12
US20110006137A1 (en) 2011-01-13
WO2009115150A1 (fr) 2009-09-24
CN101978157A (zh) 2011-02-16

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