EP3378597A1 - Ausziehverfahren eines glühkerzenstifts aus dem motor eines kraftfahrzeugs, und werkzeug-set zur umsetzung dieses verfahrens - Google Patents

Ausziehverfahren eines glühkerzenstifts aus dem motor eines kraftfahrzeugs, und werkzeug-set zur umsetzung dieses verfahrens Download PDF

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Publication number
EP3378597A1
EP3378597A1 EP18162880.1A EP18162880A EP3378597A1 EP 3378597 A1 EP3378597 A1 EP 3378597A1 EP 18162880 A EP18162880 A EP 18162880A EP 3378597 A1 EP3378597 A1 EP 3378597A1
Authority
EP
European Patent Office
Prior art keywords
pencil
rod
housing
diameter
extractor
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
EP18162880.1A
Other languages
English (en)
French (fr)
Other versions
EP3378597B1 (de
Inventor
Yannick Dudot
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.)
Hubitools SA
Original Assignee
Hubitools SA
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
Priority claimed from BE2017/5175A external-priority patent/BE1025069B1/fr
Application filed by Hubitools SA filed Critical Hubitools SA
Publication of EP3378597A1 publication Critical patent/EP3378597A1/de
Application granted granted Critical
Publication of EP3378597B1 publication Critical patent/EP3378597B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/0035—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for motor-vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/18—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same withdrawing broken threaded parts or twist drills

Definitions

  • the invention lies in the field of processes and tools for automotive mechanics and particularly relates to methods and tools for the extraction of glow plug rods of a vehicle engine, for example a motor vehicle.
  • spark plugs are also used to reduce fumes at start-up and also contribute to the regeneration of the particulate filter during the post combustion phase.
  • the glow plugs comprise a metal body with a terminal at one end and a pencil at the other end.
  • the terminal corresponds to the free end of a central connecting rod passing longitudinally through the candle to reach the pencil.
  • the terminal is connected to the electrical system of the vehicle.
  • the pencil includes a heating coil that extends partially into the combustion chamber. When the glow plug is energized, this spiral will heat and thus heat the combustion chamber.
  • the glow plugs are housed in the engine cylinder head.
  • the housing of each candle crosses the cylinder head from the outside to a combustion chamber.
  • the glow plug pencil being narrower than the body, the housing includes a lower part to house the pencil and another wider to house the body of the candle.
  • the lower part forms a shoulder with the upper part, and opens out on the combustion chamber.
  • the housing portion of the body of the candle comprises at its mouth an internal thread which allows to screw the glow plug in its housing. When the candle is worn and must be changed, the latter is unscrewed from its housing from the outside. When unscrewing, it may happen that the glow plug breaks and that the pencil remains stuck in its narrow housing. This break can appear at the shoulder of the housing of the candle or within the lower part of the housing.
  • the methods comprise a first step of drilling a bore in the rod using a drill diameter smaller than the diameter of the rod, then a step of threading the bore by means of a tap, a step of screwing an extractor into the thread, and finally a step of extracting the pencil by removing the extractor screwed in pencil.
  • the document DE202012008592 discloses a two-part guide with a second guide threaded into a first guide, and which is put in place before the piercing step.
  • the first guide is first screwed into the thread of the housing of the candle, then the second guide slides in the housing of the body of the candle to reach the edges of the pencil housing.
  • the second guide is then fixed on the first using a hexagon key and a clamping screw.
  • the second guide is hollow and allows the passage of the drill for the piercing step. So that the drill does not pierce too far at the risk of weakening the pencil, or even breaking it, a ring is present around the drill rod.
  • This ring is fixed at a distance from the drill with a hex key and a clamping screw, leaving him the freedom to drill the pencil correctly but preventing it from going too far.
  • the piercing step ends when the ring comes into abutment against the second guide.
  • the object of the invention is to meet at least one of the problems of the prior art by proposing a new method and tools for extracting a glow plug pencil that are easy to use and that can be used in an environment cluttered, suitable for any type of glow plug and do not require prior adjustments.
  • the diameter of the drill stem is configured to cooperate with the inner walls of the upper portion of the housing so as to center the drilling portion of the drill relative to the pencil during the step a) of drilling the drill. bore in the pencil.
  • the invention proposes a drill having a shoulder between the piercing portion and its stem so that the latter can abut against the shoulder of the housing of the candle, indicating the end of the step a) drilling.
  • step a) can be performed on any type of glow plug.
  • the stem by its diameter, advantageously has little play in the housing of the body of the candle and thus allows to simply and correctly center the piercing part.
  • the drill can be driven into the glow plug housing even in a crowded motor environment.
  • the tap stem has a diameter greater than both the diameter of the tapping portion so that the tap has a shoulder and at the same time the diameter of the lower part of the housing, and in that the threading step b) comprises the threading of the bore until said shoulder of the tap is placed in abutment against the shoulder of the housing of the glow plug.
  • the abutment of the shoulder of the tap against the shoulder of the housing of the candle indicates that step b) is completed.
  • the tapping portion of the tap has the same length or a length less than the tap drilling portion.
  • the diameter of the tap stem is configured to cooperate with the inner walls of the upper portion of the housing so as to center the tapping portion of the tap relative to the pencil during the step b) of threading the tap. boring made in the pencil during step a).
  • the invention thus provides a complementary means for extracting the pencil. Indeed, when a too short portion of the pencil remains stuck in the lower part of the housing of the glow plug, it is not possible to pierce it to come later insert an extractor, the risk of breaking it.
  • these steps of the extraction process do not require the introduction of a bore.
  • steps f) and g) can be performed alternately steps a), b), c) and d) when the broken pencil stuck in the glow plug housing is too short.
  • the invention thus makes it possible, when it is not possible to remove the extractor because the end of the pencil facing the combustion chamber is deformed and blocked, to retrieve the pencil through another housing, in the the housing of the injector.
  • This housing is advantageously wider than the housing of the candle and allows to easily pass the deformed pencil.
  • the centralizer comprises a complementary external thread of the internal thread of the upper part of the housing and is screwed to said internal thread.
  • the set of tools comprises at least one extractor and a mass
  • the extractor comprises a rod whose one end has a threaded head and the other end has a tip, said tip having a diameter greater than the diameter. of the rod, and said mass is crossed on both sides by a central channel comprising a diameter greater than the diameter of the rod of the extractor and less than the diameter of the tip of the rod.
  • the set of tools comprises at least one extractor comprising a rod whose one end has a threaded head, said threaded head having a diameter smaller than the diameter of said rod, said end of the rod having a threaded bore and said threaded head being screwed into said threaded bore of the rod.
  • the extractor of the invention avoids the primers of rupture of the threaded head during the screwing of the tap into the threaded bore made in the pencil, breaking which would cause the detachment of the threaded head of the rod.
  • the threaded head is here maintained along its length in the tapped bore of the rod of the extractor and withstands the forces better.
  • the threaded head can also be replaced due to wear.
  • the threaded head is in a material other than the rod, more preferably in a more rigid material. Thus the threaded head has less risk of being separated from the body.
  • the tool set comprises at least one tap for threading the bore of the pencil and comprising a tapping portion and a shank, and the shank of the tap has a diameter greater than the diameter of the tapping portion so as to forming a shoulder with the tapping portion and is chosen to have a diameter greater than the diameter "d" of the lower part of the housing of the candle.
  • the tool assembly includes at least one tap for threading the pencil bore and including a tapping portion and a shaft, said tapping portion including flutes and combs and having an inlet followed by a guide.
  • said inlet being a GUN sectional inlet in that at its level the flutes present a grind.
  • a GUN cut entry has the advantage of being a tapered entry which facilitates the centering of the tap relative to the bore during the tapping operation.
  • the tool set comprises at least one tap for threading the bore of the pencil and comprising a tapping portion and a shank, and the shank of the tap has a diameter greater than the diameter of the tapping portion so as to form a shoulder with the tapping portion.
  • the tool assembly includes at least one tap for threading the pencil bore and including a tapping portion and a shank, and the tapping portion of the tap and the drilling portion of the drill have the same length.
  • the set of tools comprises an expeller and a recuperator, said expeller comprising a rod with at one end a head, the diameter of the rod being greater than that of the head, and said recuperator comprising a magnetized portion.
  • the magnetized part of the recuperator is connected to one end of a flexible rod. The flexible stem of the recuperator makes it possible to easily probe the inside of the combustion chamber to find the position of the pencil, and to recover it by means of the magnetic part.
  • understand is synonymous with “include” and is not limiting in that it allows the presence of other elements in the device or the vehicle to which it refers. It is understood that the term “understand” includes the words “consist of”. In the different figures, the same references designate identical or similar elements.
  • the drill 1 comprises a rod 3 at one end of which is present a drilling portion 5 carrying flutes 7.
  • the drilling portion 5 has a diameter adapted to be smaller than the diameter of the rod to extract.
  • the drill 1 is remarkable in that the rod 5 has a diameter greater than the diameter of the piercing portion and the lower portion of the housing of the candle, as will be seen later.
  • the diameter of the drill stem is at least 1.5 times greater than the diameter of the piercing portion, more preferably at least 1.7 times greater, preferably at least 1.9 times greater.
  • the drill 1 thus has a shoulder 9 which is intended to come into contact with the shoulder of the housing, as will be seen later.
  • step a) of drilling the bore comprises piercing the rod until the shoulder of the drill bit 1 is placed in abutment against the shoulder of the housing.
  • the step a) of drilling the bore is represented on the figure 2 .
  • a housing 11 of a glow plug through a cylinder head 13 from the outside to a combustion chamber 15.
  • This housing 11 comprises an upper portion 17 opening outwardly and wider than a lower part 19 opening on the combustion chamber 15 so that the lower part 19 housing forms a shoulder 21 with the first.
  • the glow plug comprising a body and a pencil 23, the upper part 17 is intended to receive the body of the spark plug and the lower part 19 the pencil 23.
  • the glow plug is screwed into its housing by means of an internal thread 25 present on the walls of the upper part. 17 of the dwelling 11.
  • Step a) therefore comprises the drilling of a bore in the rod 23 to be extracted in the longitudinal direction of the latter by means of a drill bit 1 according to the invention.
  • the drilling operation is in progress but the shoulder 9 of the drill 1 is already in abutment against the shoulder 21 of the housing 11 of the glow plug.
  • Step a) ends when these two shoulders (9, 21) are in contact with each other.
  • the bore made is intended to be threaded by a tap during step b).
  • the drilling of the bore must be central with respect to the pencil 23.
  • the diameter of the rod 3 of the drill 1 is adapted to the diameter of the upper part 17 of the housing 11 to slide.
  • the drilling step does not require the establishment of a centraliser.
  • the drilling step is performed using a centralizer 27 for positioning and guiding the drill bit 1 and the drill rod 3.
  • the centralizer 27 may be a cylinder comprising a channel passing therethrough on both sides in its longitudinal direction.
  • This centralizer 27 is positioned against the walls of the upper portion 17 of the housing 11 of the glow plug and preferably comprises an external thread on these walls adapted to cooperate by screwing with the internal thread 25 of the walls of this upper portion 17.
  • the central channel has a diameter greater than the diameter of the rod 3 of the drill 1 so that the latter can be inserted therein. More specifically, the diameter of the central channel of the centralizer 27 and that of the rod 3 of the drill 1 are chosen so that the rod 3 slides in said channel but can not tilt relative to this channel.
  • the centralizer 27 guides the rod 3 in a defined direction.
  • the figure 3 presents a tap 29 according to the invention.
  • Said tap 29 comprises several parts namely a tapping portion 31 and a rod 33.
  • the tapping portion 31 of the tap 29 is configured to allow the threading of the bore made in the pencil 23 during step b) .
  • the tapping portion comprises flutes and combs, said combs for threading a bore and flutes for discharging chips of material from the tapping. Flutes can be straight or helical.
  • the tapping portion has an inlet followed by a guide.
  • the inlet of the tapping portion is a cutaway entry GUN in that at its level the flutes have a grinding wheel. Such an entrance has the particularity of being conical widening from its end to the guide.
  • the tap 29 comprises a rod 33 of diameter greater than the diameter of the tapping portion 31 and also greater than the diameter of the lower portion of the housing (11). ) of the spark plug, so that the rod 33 forms a shoulder 35 with the tapping portion 31.
  • the diameter of the tap shank is at least 1.5 times greater than the diameter of the piercing portion, preferably still at least 1.7 times higher, preferably at least 1.9 times higher.
  • the threading operation ends when the shoulder 35 of the tap 29 is placed in abutment against the shoulder 21 of the housing 11 of the glow plug.
  • This shoulder 35 makes it possible not to push the tap 29 too far into the latter.
  • the diameter of the rod 33 of the tap 29 is adapted to the diameter of the upper portion 17 of the housing 11 to slide.
  • the extractor 37 of the invention comprises a rod 39 with at one of its ends a threaded head 41 and preferably a tip 43 at the other end.
  • the presence of the tip 43 makes it easier to remove the extractor 37 and to cooperate with a mass 45 as will be seen later.
  • the threading of the head 41 corresponds to the threading made in the pencil 23 made by the tap.
  • the head of the extractor 37 has a diameter smaller than the diameter of the rod 39 so that the extractor 37 has a shoulder 47.
  • this shoulder 47 is intended to come into contact with the shoulder 21 of the housing 11 of the glow plug so as to indicate the end of the screwing step of the extractor in the threading made in the pencil 23.
  • one end of the rod has a threaded bore and the threaded head is screwed into said threaded bore of the rod.
  • the extractor 37 before the extractor 37 is screwed into the threading made in the pencil 23, the extractor 37 is first threaded into a mass 45 intended to strike the tip 43 extractor 37 during step d), as will be described below.
  • Said mass 45 preferably has a cylindrical shape but may also have a truncated conical shape with the base of the cone disposed closer to the tip 43 of the extractor 37.
  • the mass 45 comprises a central channel passing through it and other in its longitudinal direction and greater in diameter than the diameter of the rod 39 of the extractor 37 and less than the diameter of the tip 43 of the extractor 37.
  • the figure 4 represents the step d) extraction of the rod 23 by the removal of the extractor 37. This withdrawal is done by means of percussion of the mass 45 against the tip 43 of the extractor 37 in the direction of withdrawal . The pencil 23 is thus extracted through the housing 11 of the glow plug.
  • Step f) of expelling the pencil 23 or the broken portion of the pencil in the combustion chamber 15 is shown in FIG. figure 5 .
  • the expeller comprises a rod 51 with at one end a head 53 and preferably a tip 55 at the other end.
  • the rod 51 has a larger diameter than the head 53 so as to form a shoulder 57.
  • the step f) is completed when the shoulder 57 of the expeller 49 abuts with the shoulder 21 of the candle housing 11 .
  • the rod 51 has a smaller diameter than the endpiece 55.
  • the head 53 is preferably long and tapered so as to be able to completely expel the pencil 23 from its housing. For this purpose length of the head 53 is at least equal to that of the pencil 23.
  • the expulsion is achieved by means of a percussion tool 59 striking the free end of the expeller rod 49 or the tip 55 when the latter is present .
  • the expulsion operation is in progress so that the pencil 23 is not yet completely out of its housing.
  • the figure 6 represents the step g) of recovering the pencil 23 or the broken portion of the pencil in the combustion chamber 15 using a recuperator 61.
  • the recuperator 61 of the invention comprises a flexible rod 63 with at one end a magnetized portion 65. This flexibility allows the rod 63 to sneak through the housing 67 of a previously removed injector and seek in the combustion chamber 15 the pencil 23 expelled.
  • a piston 69 comprising a head 71 in the upper part. When the pencil 23 is expelled, the pencil 23 is on the upper surface of the piston head 71, as shown.
  • the magnetized portion 65 makes it possible to fix the pencil 23 to the recuperator 61 which will then be extended through the housing 67 of the injector.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Spark Plugs (AREA)
EP18162880.1A 2017-03-21 2018-03-20 Ausziehverfahren eines glühkerzenstifts aus dem motor eines kraftfahrzeugs, und werkzeug-set zur umsetzung dieses verfahrens Active EP3378597B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2017/5175A BE1025069B1 (fr) 2017-03-21 2017-03-21 Procede d'extraction d'un crayon de bougie de prechauffage de moteur de vehicule automobile et ensemble d'outils pour la mise en oeuvre d'un tel procede
FR1770295A FR3064203B3 (fr) 2017-03-21 2017-03-24 Procede d’extraction d’un crayon de bougie de prechauffage de moteur de vehicule automobile et ensemble d’outils pour la mise en oeuvre d’un tel procede

Publications (2)

Publication Number Publication Date
EP3378597A1 true EP3378597A1 (de) 2018-09-26
EP3378597B1 EP3378597B1 (de) 2020-07-22

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EP18162880.1A Active EP3378597B1 (de) 2017-03-21 2018-03-20 Ausziehverfahren eines glühkerzenstifts aus dem motor eines kraftfahrzeugs, und werkzeug-set zur umsetzung dieses verfahrens

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110193803A (zh) * 2019-05-31 2019-09-03 安徽天航机电有限公司 一种用于电磁阀套的拆卸装置及其使用方法
CN114537704A (zh) * 2022-01-19 2022-05-27 成都飞机工业（集团）有限责任公司 一种反向钻孔的操作方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007025745A1 (de) * 2007-06-01 2008-12-04 Müller-Werkzeug e.K. Werkzeugsatz, Bohrer und Verfahren zum Ausbohren von defekten Glühkerzen
DE202010011133U1 (de) * 2010-08-06 2010-10-28 Werkzeug Pichler Gesellschaft M.B.H. & Co. Kg Vorrichtung zum Freilegen einer Führung für eine Glühkerzenausbohrvorrichtung
EP2826580A1 (de) * 2013-07-17 2015-01-21 Werkzeug Pichler GmbH & Co. KG Bohrstift mit stufenförmigem Bohrbereich

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007025745A1 (de) * 2007-06-01 2008-12-04 Müller-Werkzeug e.K. Werkzeugsatz, Bohrer und Verfahren zum Ausbohren von defekten Glühkerzen
DE202010011133U1 (de) * 2010-08-06 2010-10-28 Werkzeug Pichler Gesellschaft M.B.H. & Co. Kg Vorrichtung zum Freilegen einer Führung für eine Glühkerzenausbohrvorrichtung
EP2826580A1 (de) * 2013-07-17 2015-01-21 Werkzeug Pichler GmbH & Co. KG Bohrstift mit stufenförmigem Bohrbereich

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110193803A (zh) * 2019-05-31 2019-09-03 安徽天航机电有限公司 一种用于电磁阀套的拆卸装置及其使用方法
CN114537704A (zh) * 2022-01-19 2022-05-27 成都飞机工业（集团）有限责任公司 一种反向钻孔的操作方法
CN114537704B (zh) * 2022-01-19 2023-08-04 成都飞机工业（集团）有限责任公司 一种反向钻孔的操作方法

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