EP0638971B1 - Bobine d'allumage avec une taille transversale réduite - Google Patents

Bobine d'allumage avec une taille transversale réduite Download PDF

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Publication number
EP0638971B1
EP0638971B1 EP94110339A EP94110339A EP0638971B1 EP 0638971 B1 EP0638971 B1 EP 0638971B1 EP 94110339 A EP94110339 A EP 94110339A EP 94110339 A EP94110339 A EP 94110339A EP 0638971 B1 EP0638971 B1 EP 0638971B1
Authority
EP
European Patent Office
Prior art keywords
spool
coil according
high voltage
bush
terminal
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
EP94110339A
Other languages
German (de)
English (en)
Other versions
EP0638971A1 (fr
Inventor
Daniele Rossi
Paolo Pignatti
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.)
Cooper Industries LLC
Original Assignee
Cooper Industries LLC
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 Cooper Industries LLC filed Critical Cooper Industries LLC
Publication of EP0638971A1 publication Critical patent/EP0638971A1/fr
Application granted granted Critical
Publication of EP0638971B1 publication Critical patent/EP0638971B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/40—Sparking plugs structurally combined with other devices
    • H01T13/44—Sparking plugs structurally combined with other devices with transformers, e.g. for high-frequency ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
    • 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
    • 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
    • H01F2038/122—Ignition, e.g. for IC engines with rod-shaped core

Definitions

  • the present invention relates to an ignition coil, particularly for a multi-valve internal combustion engine provided with a static distribution ignition system.
  • the object of the present invention is to produce an ignition coil of reduced lateral size which enables the above disadvantage to be overcome satisfactorily although offering performance which is equal to or greater than the coils of the prior art.
  • the coil according to the present invention comprises a core 2 made of ferromagnetic material and having a substantially linear development.
  • the core 2 is, for example, formed of a cylinder with a circular section and made of ferromagnetic material wound in a spiral, for example sheet metal (0.2 mm thick).
  • the core 2 is intended to be inserted in a spool 4, shown in Figure 3, for the secondary winding.
  • the secondary spool 4 comprises a plurality of cells 5 which can accommodate the secondary, or high-voltage, winding.
  • the secondary spool 4 is made of insulating material, for example plastics material, with a bush 6 comoulded from electrically conductive material.
  • the purpose of the bush 6 is to enable the terminals 7 to be connected by the connection to the spark plug (not illustrated) of the internal combustion engine.
  • the terminal 7 is fixed to the bush 6 by means of a pin 13, shown in Figure 7, which engages a slot 14 provided in the terminal 7. This arrangement enables the terminal 7 to slide inside a hole 15 in the bush 6.
  • This hole 15 is provided with a spring 16 such that the terminal 7 is urged in the direction of the spark plug and its cup-shaped seat 17 is always in contact with the positive terminal of the spark plug.
  • This arrangement is particularly useful in applications in which there are different measurements between the terminals of the coil and of the spark plug.
  • the measuring interval, to which the coil according to the present invention can be correctly applied, is determined by the axial dimension of the slot 14.
  • the secondary spool 4 has an axial cavity 8 which can accommodate the core 2, terminating in a surface 9 at right angles to the axis of the spool 4 itself against which the core 2 abuts when inserted.
  • the primary spool 20, shown in Figures 4, 5, 6 and 8, is force-fitted on a cylindrical upper outer portion 10 of the secondary spool 4.
  • a flange 11, also provided on the secondary spool 4, has the function of providing a shoulder for conferring a specific desired axial position on the primary spool 20.
  • the primary spool 20 which is also made of insulating material, can accommodate the primary, or low-voltage, winding.
  • the shape of the latter is substantially that of a tube with a bore such that it can be fitted, as stated above, on the secondary spool 4. It will be appreciated that the outer surface 21 of the primary spool 20 can accommodate the primary winding of the coil.
  • the two ends of the outer surface 21 of the primary spool 20 have respective radial projections 22, 23, the function of which is to act as a shoulder for the primary winding.
  • the internal surface 24 of the primary spool 20 has radial projections 25 which, when the primary spool 20 is mounted on the secondary spool 4, cooperate by means of a surface 26, such that they abut the flange 11 of the secondary spool 4. In this way, as stated above, a predetermined axial position relative to the secondary spool 4 is imparted to the primary spool 20.
  • projections 27 of a size such that their surfaces 28 facing the axis have a slight interference, with an end portion 10 of the secondary spool 4, when the primary spool 20 has been mounted on the secondary spool 4.
  • the coil is further provided with a hood 30, shown in Figure 10, made of insulating plastics material and having the following functions:
  • liquid impregnating resin is cast in the coil and is subsequently polymerised, rendering it solid.
  • the coil is provided with electrical connectors.
  • it comprises a low voltage connecter 32, having electrical supply terminals 33, 34, the positive terminal 33 of which is connected to a positive terminal of the primary winding, and the negative terminal 34 of which is connected to the negative terminals of the primary winding and the secondary winding.
  • a portion 35 of the low voltage connector 32 is disposed so as to enable the low voltage connector 32 to be centred on the cavity 8 in the secondary spool 4. Furthermore, the portion 35 of this connector is shaped such that its end surface 36 adheres to the core 2. In contrast, a portion 37 of the low voltage connector 32 is shaped such that it has external size which is smaller than the bore of the container 31 (at least 4 mm), such that the impregnating resin can be cast.
  • the coil produced in this way has lateral size which is very compact and enables it to be used in engines in which the available space is limited although it is cheap and simple to produce.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (16)

  1. Bobine d'allumage, destinée à être montée directement sur une bougie d'allumage, comprenant, sous forme de combinaisons fonctionnelles :
    - un noyau (2) qui conduit un flux électromagnétique,
    - un premier bobinot (4) portant un enroulement à haute tension et supportant le noyau (2) dans une cavité axiale interne (8),
    - un second bobinot (20) portant un enroulement à basse tension et destiné à être monté sur le premier bobinot (4),
    - un dispositif (6, 7) de connexion associé au premier bobinot (4) et connectant une borne de l'enroulement à haute tension à la bougie d'allumage,
       caractérisée en ce que le premier bobinot (4) a un flasque (11) placé à une première extrémité distante du dispositif de connexion (6, 7), et le second bobinot (20) possède, à sa surface interne (24), des saillies radiales (25) qui délimitent des surfaces de butée (26) qui peuvent coopérer avec le flasque (11) pour déterminer une position axiale relative de montage entre le premier bobinot (4) et le second bobinot (20), le second bobinot (20) ayant une longueur axiale nettement inférieure à la longueur axiale du premier bobinot (4).
  2. Bobine selon la revendication 1, caractérisée en ce que la surface interne (24) du second bobinot (20) a des saillies supplémentaires (27) destinées à coopérer, par leurs surfaces internes (28) avec les parties (10) d'extrémité de la première extrémité du premier bobinot (4) afin que le second bobinot (20) soit ajusté sur le premier bobinot (4) .
  3. Bobine selon la revendication 2, caractérisée en ce que le premier bobinot (4) a une surface externe formée comme plusieurs cellules (5) destinées à loger l'enroulement à haute tension.
  4. Bobine selon la revendication 3, caractérisée en ce que le second bobinot (20) possède, à sa surface externe (21), des saillies (22, 23) placées aux deux extrémités du second bobinot (20) et destinées à former des épaulements pour l'enroulement à basse tension.
  5. Bobine selon la revendication 4, caractérisée en ce que le dispositif de connexion (6, 7) comporte un manchon (6) formé d'un matériau conducteur de l'électricité et moulé simultanément avec le premier bobinot (4).
  6. Bobine selon la revendication 5, caractérisée en ce que le dispositif de connexion (6, 7) comporte une borne à haute tension (7) destinée à venir au contact d'une borne de connexion de la bougie d'allumage, la borne ayant un siège (17) de contact qui est concave et a pratiquement une forme de cuvette et qui est associé au manchon (6) afin qu'il soit mobile.
  7. Bobine selon la revendication 6, caractérisée en ce que la borne à haute tension (7) peut coulisser dans le manchon (6) afin qu'il puisse être adapté à des systèmes ayant de dimensions différentes.
  8. Bobine selon la revendication 7, caractérisée en ce qu'il comprend un dispositif élastique (16) disposé pendant le fonctionnement entre le manchon (6) et la borne à haute tension (7) afin qu'il repousse la borne (7) vers la bougie d'allumage et assure un contact électrique optimal.
  9. Bobine selon la revendication 8, caractérisée en ce que le dispositif élastique comporte un ressort hélicoïdal (16).
  10. Bobine selon la revendication 9, caractérisée en ce que la borne à haute tension (7) a une ouverture allongée (14) dans laquelle une broche (13) est destinée à être introduite, la broche étant placée dans le manchon (6), l'ouverture allongée (14) et la broche (13) étant disposées afin qu'elles délimitent le déplacement axial de la borne à haute tension (7) par rapport au manchon (6).
  11. Bobine selon la revendication 10, caractérisée en ce que la dimension, en direction axiale, de l'ouverture allongée (14) détermine la longueur de déplacement de la borne (7) à haute tension.
  12. Bobine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comporte un récipient pratiquement tubulaire (31) qui peut être monté sur le second bobinot (20).
  13. Bobine selon la revendication 12, caractérisée en ce qu'elle comporte un capot (30) qui peut être monté sur une seconde extrémité, en étant tourné vers la bougie d'allumage, et autour du manchon (6).
  14. Bobine selon la revendication 13, caractérisée en ce que le récipient (31) et le capot (30) forment ensemble un carter qui permet l'introduction d'un matériau isolant, coulé en phase liquide, puis solidifié.
  15. Bobine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comporte un dispositif (32) de connexion à basse tension introduit à la première extrémité du premier bobinot (4).
  16. Bobine selon la revendication 15, caractérisée en ce que le noyau (2) est cylindrique et est constitué d'une feuille enroulée d'un matériau ferromagnétique.
EP94110339A 1993-08-10 1994-07-04 Bobine d'allumage avec une taille transversale réduite Expired - Lifetime EP0638971B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930603 1993-08-10
ITTO930603A IT1260977B (it) 1993-08-10 1993-08-10 Bobina di accensione ad ingombro trasversale ridotto.

Publications (2)

Publication Number Publication Date
EP0638971A1 EP0638971A1 (fr) 1995-02-15
EP0638971B1 true EP0638971B1 (fr) 1997-04-16

Family

ID=11411685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110339A Expired - Lifetime EP0638971B1 (fr) 1993-08-10 1994-07-04 Bobine d'allumage avec une taille transversale réduite

Country Status (4)

Country Link
EP (1) EP0638971B1 (fr)
DE (1) DE69402636T2 (fr)
ES (1) ES2102732T3 (fr)
IT (1) IT1260977B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69706494T2 (de) * 1996-08-31 2002-04-18 Toyo Denso K.K., Tokio/Tokyo Zündspulenvorrichtung für Brennkraftmaschine
EP1162366A1 (fr) * 2000-06-06 2001-12-12 Federal-Mogul Ignition Srl Bobine d'allumage pour véhicules automobiles
DE10314063B4 (de) * 2003-03-28 2005-12-15 Audi Ag Aufsteckbare Stabzündspule

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4514712A (en) * 1975-02-13 1985-04-30 Mcdougal John A Ignition coil
SE436672B (sv) * 1983-08-05 1985-01-14 Saab Scania Ab Tendkassett ingaende i en forbrenningsmotors tendsystem
US4715337A (en) * 1985-01-31 1987-12-29 Caterpillar Inc. Engine ignition system with an insulated and extendable extender
IT1182680B (it) * 1985-11-13 1987-10-05 Magneti Marelli Spa Sistema di accensione per un motore a combustione interna
JPH0715853B2 (ja) * 1986-11-21 1995-02-22 日本電装株式会社 エネルギ−蓄積型点火コイル
DE3851478T2 (de) * 1987-06-30 1995-03-16 Tdk Corp Transformator.
DE3920080C2 (de) * 1989-06-20 1994-08-04 Audi Ag Zündvorrichtung für eine Brennkraftmaschine
JPH04313205A (ja) * 1991-04-10 1992-11-05 Nippondenso Co Ltd 内燃機関用気筒別点火コイル

Also Published As

Publication number Publication date
ITTO930603A1 (it) 1995-02-10
IT1260977B (it) 1996-04-29
ITTO930603A0 (it) 1993-08-10
ES2102732T3 (es) 1997-08-01
DE69402636D1 (de) 1997-05-22
DE69402636T2 (de) 1997-10-16
EP0638971A1 (fr) 1995-02-15

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