EP0552168B1 - High-voltage terminals for ignition coils - Google Patents

High-voltage terminals for ignition coils Download PDF

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Publication number
EP0552168B1
EP0552168B1 EP91915501A EP91915501A EP0552168B1 EP 0552168 B1 EP0552168 B1 EP 0552168B1 EP 91915501 A EP91915501 A EP 91915501A EP 91915501 A EP91915501 A EP 91915501A EP 0552168 B1 EP0552168 B1 EP 0552168B1
Authority
EP
European Patent Office
Prior art keywords
ignition
ignition cable
cable
shrink
retaining part
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.)
Expired - Lifetime
Application number
EP91915501A
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German (de)
French (fr)
Other versions
EP0552168A1 (en
Inventor
Claus Ruppmann
Andreas Ehrmann
Alexander Bareiss
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0552168A1 publication Critical patent/EP0552168A1/en
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Publication of EP0552168B1 publication Critical patent/EP0552168B1/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines

Definitions

  • the invention relates to an ignition coil with a high-voltage connection according to the preamble of claim 1.
  • a high-voltage connection of an ignition cable to an ignition coil is already known from DE-A-35 06 929.
  • the ignition cable end is inserted into an opening of a connection tower and contacted with a tapered contact pin, the contact pin being electrically connected to the end of a high-voltage winding via a contact wire.
  • the connection tower, in the opening of which the ignition cable leads, is sealed against moisture by a grommet.
  • plug contacts for connecting the high-voltage cable to the high-voltage winding.
  • These plug contacts can be insulating plastic molded parts.
  • Such molded plastic parts do not always ensure low-loss transmission, particularly when the voltage is extremely high, for example if moisture has penetrated there.
  • the plastic molded part would have to be dimensioned larger.
  • this has the disadvantage that the connection point has much larger dimensions and that the weight of the ignition system also increases.
  • a high-voltage connection is to be developed which eliminates these disadvantages and, with the lowest possible weight, ensures low-loss transmission of the high voltage from the ignition coil to the ignition cable.
  • the ignition system according to the invention with the characterizing features of claim 1 has the advantage over the known that the high-voltage connection has small dimensions and thus also a low weight and that the contacting is very well protected from moisture by multiple overlaps of different components.
  • FIGS. 1 and 2 show sections of the ignition coil of an ignition system with secondary winding 7 and primary winding 10 arranged in a housing 9.
  • a contact part 1 on the two high-voltage ends of the secondary winding 7 is in each case with an ignition cable 2 electrically conductively connected, a shrink tube 3 being pulled over the end of the ignition cable, for better connection of the ignition cable and casting resin.
  • the ignition cable 2 with shrink tube 3 is in a holding part 4, the transition point being sealed by an adhesive 5 and the ignition cable 2 protruding from the ignition coil being covered by an additional molded shrink part 6 at the transition point.
  • FIG. 2 shows, in addition to a primary connection 11, the connection point of the contact part 1 and the ignition cable 2, the casting resin level 8 being shown here, up to which the housing 9 of the ignition coil is filled with hardenable casting resin.
  • each of the contact parts 1 of the secondary winding 7 is connected to one of the ignition cables 2 in an electrically conductive and mechanically fixed manner.
  • the ignition cable end lies within the ignition coil in the casting resin with which the ignition coil is poured out. Due to their material properties, cast resin and ignition cables only make a very bad connection.
  • the end of the ignition cable is covered with the shrink tube 3.
  • This shrink tube 3 has the property of being better connected to the outside with the casting resin and, on the inside, due to its adhesive-like surface forming a moisture-tight connection with the ignition cable. Without additional measures, the ignition cable would be subjected to high mechanical stress at the potting compound / air / cable transition point.
  • the ignition cable is immovably embedded in the casting resin and is movable after exiting the casting resin, ie there is a risk that the ignition cable will become detached from the casting resin.
  • the ignition cable ends with the shrink tube 3 are pushed through corresponding openings in the holding part 4 made of plastic before they are connected to the contact part 1 with the secondary winding 10.
  • the resulting structural unit according to FIG. 1 is then inserted into the housing 9 according to FIG. 2, the holding part 4 being made somewhat of the casting compound protrudes and so converts the potting compound / air / cable into the potting compound / holding part / cable.
  • This holding part 4 thus takes over the mechanical function of the previously usual plug contact, but has the advantage that its dimensions are significantly smaller. To this transition z. B.
  • the molded shrink part 6 is now pushed with its one end over the end of the holding part 4 protruding from the cast resin mirror, lies with its other end against the ignition cable 2 and is attached to these parts in a moisture-tight manner by the adhesive 5.
  • the various connecting parts such as shrink tubing, holding part and molded shrink tubing overlap at their transitions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

Proposed is a moulded-resin ignition coil with a high-voltage terminal designed to conduct the ignition energy between the ignition coil (7) and the ignition-unit cable (2) with only low losses. This terminal comprises a tight connection plus a holding element, extending out beyond the surface (8) of the resin, to which the end of the cable is fitted. To protect the terminal from moisture and mechanical stresses, the end of the cable (2) is surrounded by at least one sealing element (3) which makes a moisture-proof join with the cable (2) and with the holding element (4).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Zündspule mit einem Hochspannungsanschluß nach der Gattung des Anspruchs 1. Es ist bereits aus der DE-A-35 06 929 ein Hochspannungsanschluß eines Zündkabels an eine Zündspule bekannt. Es wird hier das Zündkabelende in eine Öffnung eines Anschlußturms eingeführt und mit einem spitz zulaufenden Kontaktstift kontaktiert, wobei der Kontaktstift mit dem Ende einer hochspannungsführenden Wicklung über einen Kontaktdraht elektrisch verbunden ist. Der Anschlußturm, in dessen Öffnung das Zündkabel führt, ist durch eine Tülle gegen Feuchtigkeit abgedichtet.The invention relates to an ignition coil with a high-voltage connection according to the preamble of claim 1. A high-voltage connection of an ignition cable to an ignition coil is already known from DE-A-35 06 929. Here the ignition cable end is inserted into an opening of a connection tower and contacted with a tapered contact pin, the contact pin being electrically connected to the end of a high-voltage winding via a contact wire. The connection tower, in the opening of which the ignition cable leads, is sealed against moisture by a grommet.

Weiterhin ist es üblich, für die Verbindung des Hochspannungskabels mit der Hochspannungswicklung Steckkontakte zu verwenden. Diese Steckkontakte können isolierende Plastikformteile sein. Solche Plastikformteile gewährleisten gerade bei extrem hohen Spannungen nicht immer eine verlustarme Weiterleitung, zum Beispiel bei dort eingedrungener Feuchtigkeit. Um eine hohe Spannungsfestigkeit zu gewährleisten, müßte das Plastikformteil größer dimensioniert werden. Das hat jedoch den Nachteil, daß die Verbindungsstelle wesentlich größere Ausmaße hat und daß sich das Gewicht der Zündanlage ebenfalls erhöht.Furthermore, it is common to use plug contacts for connecting the high-voltage cable to the high-voltage winding. These plug contacts can be insulating plastic molded parts. Such molded plastic parts do not always ensure low-loss transmission, particularly when the voltage is extremely high, for example if moisture has penetrated there. In order to ensure a high dielectric strength, the plastic molded part would have to be dimensioned larger. However, this has the disadvantage that the connection point has much larger dimensions and that the weight of the ignition system also increases.

Es soll ein Hochspannungsanschluß entwickelt werden, der diese Nachteile beseitigt und mit möglichst geringem Gewicht, ein verlustarmes Weiterleiten der Hochspannung von der Zündspule zum Zündkabel gewährleistet.A high-voltage connection is to be developed which eliminates these disadvantages and, with the lowest possible weight, ensures low-loss transmission of the high voltage from the ignition coil to the ignition cable.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Zündanlage mit den kennzeichnenden Merkmalen des Anspruchs 1 hat gegenüber dem Bekannten den Vorteil, daß der Hochspannungsanschluß geringe Ausmaße und damit auch ein geringes Gewicht hat und daß außerdem die Kontaktierung durch mehrfache Überlappung verschiedener Bauteile sehr gut vor Feuchtigkeit geschützt ist.The ignition system according to the invention with the characterizing features of claim 1 has the advantage over the known that the high-voltage connection has small dimensions and thus also a low weight and that the contacting is very well protected from moisture by multiple overlaps of different components.

Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Hochspannungsanschluß möglich.The measures listed in the dependent claims allow advantageous developments and improvements of the high-voltage connection specified in the main claim.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is shown in the drawing and explained in more detail in the following description.

Es zeigen

  • Figur 1 eine Zündspulen-Hochspannungswicklung mit dem Hochspannungsanschluß eines Zündkabels,
  • Figur 2 die Hochspannungswicklung mit Zündkabel im Gehäuse mit einem Gießharzspiegel.
Show it
  • FIG. 1 shows an ignition coil high-voltage winding with the high-voltage connection of an ignition cable,
  • Figure 2 shows the high-voltage winding with ignition cable in the housing with a cast resin mirror.

Beschreibung des AusführungsbeispieleDescription of the embodiments

Figur 1 und 2 zeigen ausschnittsweise die Zündspule einer Zündanlage mit in einem Gehäuse 9 angeordneten Sekundärwicklung 7 und Primärwicklung 10. Ein Kontaktteil 1 an den zwei hochspannungsseitigen Enden der Sekundärwicklung 7 ist jeweils mit einem Zündkabel 2 elektrisch leitend verbunden, wobei über das Zündkabelende ein Schrumpfschlauch 3, zur besseren Verbindung von Zündkabel und Gießharz, gezogen ist. Das Zündkabel 2 mit Schrumpfschlauch 3 steckt in einem Halteteil 4, wobei die Übergangsstelle von einem Kleber 5 abgedichtet ist und das aus der Zündspule herausragende Zündkabel 2 an der Übergangsstelle von einem zusätzlichen Formschrumpfteil 6 überzogen ist. Figur 2 zeigt neben einem Primäranschluß 11 noch einmal die Verbindungsstelle von Kontaktteil 1 und Zündkabel 2, wobei hier der Gießharzspiegel 8 angezeigt ist, bis zu dem das Gehäuse 9 der Zündspule mit aushärtbarem Gießharz ausgefüllt wird.FIGS. 1 and 2 show sections of the ignition coil of an ignition system with secondary winding 7 and primary winding 10 arranged in a housing 9. A contact part 1 on the two high-voltage ends of the secondary winding 7 is in each case with an ignition cable 2 electrically conductively connected, a shrink tube 3 being pulled over the end of the ignition cable, for better connection of the ignition cable and casting resin. The ignition cable 2 with shrink tube 3 is in a holding part 4, the transition point being sealed by an adhesive 5 and the ignition cable 2 protruding from the ignition coil being covered by an additional molded shrink part 6 at the transition point. FIG. 2 shows, in addition to a primary connection 11, the connection point of the contact part 1 and the ignition cable 2, the casting resin level 8 being shown here, up to which the housing 9 of the ignition coil is filled with hardenable casting resin.

Der in Figur 1 gezeigte Hochspannungsanschluß soll im folgenden näher erläutert werden. Jedes der Kontaktteile 1 der Sekundärwicklung 7 ist mit einem der Zündkabel 2 elektrisch leitend und mechanisch fest verbunden. Das Zündkabelende liegt innerhalb der Zündspule in dem Gießharz, mit dem die Zündspule ausgegossen wird. Aufgrund Ihrer Materialbeschaffenheit gehen Gießharz und Zündkabel nur eine sehr schlechte Verbindung ein. Um Kriechströme zu vermeiden, überzieht man das Zündkabelende mit dem Schrumpfschlauch 3. Dieser Schrumpfschlauch 3 hat die Eigenschaft, sich nach außen mit dem Gießharz besser zu verbinden und nach innen, aufgrund seiner klebeartigen Oberfläche eine feuchtigkeitsdichte Verbindung mit dem Zündkabel einzugehen. Ohne zusätzliche Maßnahmen würde an der Übergangsstelle Vergußmasse/Luft/Kabel das Zündkabel stark mechanisch beansprucht. Das ergibt sich, da das Zündkabel in dem Gießharz unbeweglich eingebettet ist und nach Austritt aus dem Gießharz beweglich ist, d. h. es besteht die Gefahr, daß sich das Zündkabel vom Gießharz ablöst. Um das zu vermeiden, werden die Zündkabelenden mit dem Schrumpfschlauch 3 durch entsprechende Öffnungen des aus Kunststoff hergestellten Halteteils 4 geschoben, bevor sie an des Kontaktteilen 1 mit der Sekundärwicklung 10 verbunden werden. Die so entstehende Baueinheit gemäß Figur 1 wird dann in das Gehäuse 9 gemäß Figur 2 eingesetzt, wobei das Halteteil 4 etwas aus der Vergußmasse herausragt und so die Übergangsstelle Vergußmasse/Luft/Kabel in die Übergangsstelle Vergußmasse/Halteteil/Kabel umwandelt. Dieses Halteteil 4 übernimmt somit die mechanische Funktion des bisher üblichen Steckkontaktes, hat jedoch den Vorteil, daß seine Ausmaße wesentlich geringer sind. Um diesen Übergang z. B. vor Feuchtigkeit oder Verunreinigung zu schützen, wird er mittels einem Kleber 5 abgedichtet in der Art, daß der Kleber auf dem Zündkabel beginnend über den Schrumpfschlauch 3 und in das Halteteil 4 - in den Spalt zwischen Innenwand der Öffnung des Halteteils 4 und Außenwand des auf das Zündkabel 2 aufgezogenen Schrumpfschlauchs 3 - bis an den Gießharzspiegel heranreicht. Als weiteren Dichtteil wird nun noch das Formschrumpfteil 6 mit seinem einen Ende über das aus dem Gießharzspiegel vorstehende Ende des Halteteils 4 geschoben, liegt mit seinem anderen Ende am Zündkabel 2 an und ist durch den Kleber 5 feuchtigkeitsdicht an diesen Teilen befestigt. Die verschiedenen Verbindungsteile wie Schrumpfschlauch, Halteteil und Formschrumpfschlauch überlappen sich an ihren Übergängen.The high-voltage connection shown in FIG. 1 will be explained in more detail below. Each of the contact parts 1 of the secondary winding 7 is connected to one of the ignition cables 2 in an electrically conductive and mechanically fixed manner. The ignition cable end lies within the ignition coil in the casting resin with which the ignition coil is poured out. Due to their material properties, cast resin and ignition cables only make a very bad connection. In order to avoid leakage currents, the end of the ignition cable is covered with the shrink tube 3. This shrink tube 3 has the property of being better connected to the outside with the casting resin and, on the inside, due to its adhesive-like surface forming a moisture-tight connection with the ignition cable. Without additional measures, the ignition cable would be subjected to high mechanical stress at the potting compound / air / cable transition point. This is because the ignition cable is immovably embedded in the casting resin and is movable after exiting the casting resin, ie there is a risk that the ignition cable will become detached from the casting resin. To avoid this, the ignition cable ends with the shrink tube 3 are pushed through corresponding openings in the holding part 4 made of plastic before they are connected to the contact part 1 with the secondary winding 10. The resulting structural unit according to FIG. 1 is then inserted into the housing 9 according to FIG. 2, the holding part 4 being made somewhat of the casting compound protrudes and so converts the potting compound / air / cable into the potting compound / holding part / cable. This holding part 4 thus takes over the mechanical function of the previously usual plug contact, but has the advantage that its dimensions are significantly smaller. To this transition z. B. to protect against moisture or contamination, it is sealed by means of an adhesive 5 in such a way that the adhesive on the ignition cable starting over the shrink tube 3 and in the holding part 4 - in the gap between the inner wall of the opening of the holding part 4 and the outer wall of the on the ignition cable 2 drawn shrink tube 3 - up to the resin level. As a further sealing part, the molded shrink part 6 is now pushed with its one end over the end of the holding part 4 protruding from the cast resin mirror, lies with its other end against the ignition cable 2 and is attached to these parts in a moisture-tight manner by the adhesive 5. The various connecting parts such as shrink tubing, holding part and molded shrink tubing overlap at their transitions.

Auf diese Art entsteht ein hochspannungsfester Übergang zwischen Hochspannungswicklung und Zündkabel, der sich zudem durch geringe Ausmaße und ein geringes Gewicht auszeichnet.This creates a high-voltage-resistant transition between the high-voltage winding and the ignition cable, which is also characterized by its small dimensions and light weight.

Claims (4)

  1. Ignition coil with ignition cable, with primary and secondary windings embedded in a casting resin, and with a high-voltage connection for at least one ignition cable (2), in which the transition of the secondary winding (7) to the ignition cable (2) consists of a contact part (1) which on the one hand is contacted at the high-voltage end of the secondary winding (7) and, on the other hand, at the conductor end of the ignition cable (2), in which arrangement the ignition cable (2) is located in an aperture of a retaining part (4) which protrudes from the cast resin level, characterised by the fact that that the end section of the ignition cable (2) is concentrically surrounded by a shrink hose (3) which acts as a sealing part, with the shrink hose (3) commencing outside the retaining part (4) and extending through the aperture of the retaining part (4) and with a shrink form part (6) as a further sealing part pulled concentrically with its one end over the retaining part (4) and with its other end over the ignition cable (2) and bonded in at least one other region to the retaining part (4) so as to seal against moisture.
  2. Ignition coil in accordance with claim 1, characterised in that an adhesive (5) is used as a sealing compound which starts on the ignition cable (2) and extends via the shrink hose (3) through an annular gap between the inner wall of the aperture of the retaining part (4) and the outer skin of the shrink hose (3) with the ignition cable (2) within, up to the level of the casting resin (8).
  3. Ignition coil in accordance with claims 1 and 2, characterised in that the shrink form part (6) is fixed to the ignition cable (2) and on the retaining part (4) by means of an adhesive (5) so as to provide a moisture-proof seal.
  4. Ignition coil in accordance with claim 3, characterised in that the central part of the shrink form part (6) covers the end section of the shrink hose (3) which protrudes from the retaining part (4).
EP91915501A 1990-10-11 1991-09-06 High-voltage terminals for ignition coils Expired - Lifetime EP0552168B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4032280 1990-10-11
DE4032280A DE4032280A1 (en) 1990-10-11 1990-10-11 HIGH VOLTAGE CONNECTIONS TO IGNITION COILS
PCT/DE1991/000710 WO1992007370A1 (en) 1990-10-11 1991-09-06 High-voltage terminals for ignition coils

Publications (2)

Publication Number Publication Date
EP0552168A1 EP0552168A1 (en) 1993-07-28
EP0552168B1 true EP0552168B1 (en) 1994-07-27

Family

ID=6416089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91915501A Expired - Lifetime EP0552168B1 (en) 1990-10-11 1991-09-06 High-voltage terminals for ignition coils

Country Status (5)

Country Link
US (1) US5543772A (en)
EP (1) EP0552168B1 (en)
JP (1) JPH06501814A (en)
DE (2) DE4032280A1 (en)
WO (1) WO1992007370A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001244135A (en) * 2000-02-28 2001-09-07 Hitachi Ltd Ignition coil for internal combustion engine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930011A (en) * 1957-11-22 1960-03-22 Westinghouse Electric Corp Transformers with molded containers
US4161776A (en) * 1977-07-13 1979-07-17 Denki Onkyo Co., Ltd. Flyback transformer with high tension connector
JPS608412Y2 (en) * 1980-03-12 1985-03-25 三洋電機株式会社 flyback transformer
US4587942A (en) * 1983-11-07 1986-05-13 R. E. Phelon Company Breakerless ignition system and method of manufacture thereof
DE3506929A1 (en) * 1985-02-27 1986-08-28 Robert Bosch Gmbh, 7000 Stuttgart IGNITION DEVICE WITH A HIGH VOLTAGE CONNECTION
US4683454A (en) * 1985-10-31 1987-07-28 Automatic Switch Company Solenoid actuator with electrical connection modules
KR910004117Y1 (en) * 1987-06-04 1991-06-15 미쓰비시전기 주식회사 Revolution detecting device
JPH01140706A (en) * 1987-11-27 1989-06-01 Hitachi Ltd Ignition coil for internal combustion engine

Also Published As

Publication number Publication date
DE4032280A1 (en) 1992-04-16
JPH06501814A (en) 1994-02-24
DE59102383D1 (en) 1994-09-01
US5543772A (en) 1996-08-06
EP0552168A1 (en) 1993-07-28
WO1992007370A1 (en) 1992-04-30

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