EP0638971A1 - 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
EP0638971A1
EP0638971A1 EP94110339A EP94110339A EP0638971A1 EP 0638971 A1 EP0638971 A1 EP 0638971A1 EP 94110339 A EP94110339 A EP 94110339A EP 94110339 A EP94110339 A EP 94110339A EP 0638971 A1 EP0638971 A1 EP 0638971A1
Authority
EP
European Patent Office
Prior art keywords
spool
coil according
high voltage
bush
intended
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
EP94110339A
Other languages
German (de)
English (en)
Other versions
EP0638971B1 (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)
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 true EP0638971A1 (fr) 1995-02-15
EP0638971B1 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0827163A2 (fr) * 1996-08-31 1998-03-04 Toyo Denso Kabushiki Kaisha Dispositif de bobine d'allumage pour moteur
US6636138B2 (en) * 2000-06-06 2003-10-21 Federal-Mogul Ignition Srl Ignition coil for motor vehicles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10314063B4 (de) * 2003-03-28 2005-12-15 Audi Ag Aufsteckbare Stabzündspule

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985000930A1 (fr) * 1983-08-05 1985-02-28 Saab-Scania Aktiebolag Unite d'allumage du systeme d'allumage d'un moteur a combustion interne
US4514712A (en) * 1975-02-13 1985-04-30 Mcdougal John A Ignition coil
WO1986004480A2 (fr) * 1985-01-31 1986-08-14 Caterpillar Inc. Systeme d'allumage de moteur avec extendeur isole et extensible
EP0224452A1 (fr) * 1985-11-13 1987-06-03 MAGNETI MARELLI S.p.A. Système d'allumage pour moteur à combustion interne
GB2199193A (en) * 1986-11-21 1988-06-29 Nippon Denso Co Ignition coil
EP0297487A1 (fr) * 1987-06-30 1989-01-04 TDK Corporation Transformateur
DE3920080A1 (de) * 1989-06-20 1991-01-10 Audi Ag Zuendvorrichtung fuer eine brennkraftmaschine
EP0508374A1 (fr) * 1991-04-10 1992-10-14 Nippondenso Co., Ltd. Unité de bobine d'allumage pour moteur à combustion interne

Patent Citations (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
WO1985000930A1 (fr) * 1983-08-05 1985-02-28 Saab-Scania Aktiebolag Unite d'allumage du systeme d'allumage d'un moteur a combustion interne
WO1986004480A2 (fr) * 1985-01-31 1986-08-14 Caterpillar Inc. Systeme d'allumage de moteur avec extendeur isole et extensible
EP0224452A1 (fr) * 1985-11-13 1987-06-03 MAGNETI MARELLI S.p.A. Système d'allumage pour moteur à combustion interne
GB2199193A (en) * 1986-11-21 1988-06-29 Nippon Denso Co Ignition coil
EP0297487A1 (fr) * 1987-06-30 1989-01-04 TDK Corporation Transformateur
DE3920080A1 (de) * 1989-06-20 1991-01-10 Audi Ag Zuendvorrichtung fuer eine brennkraftmaschine
EP0508374A1 (fr) * 1991-04-10 1992-10-14 Nippondenso Co., Ltd. Unité de bobine d'allumage pour moteur à combustion interne

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0827163A2 (fr) * 1996-08-31 1998-03-04 Toyo Denso Kabushiki Kaisha Dispositif de bobine d'allumage pour moteur
EP0827163A3 (fr) * 1996-08-31 1998-11-18 Toyo Denso Kabushiki Kaisha Dispositif de bobine d'allumage pour moteur
US6636138B2 (en) * 2000-06-06 2003-10-21 Federal-Mogul Ignition Srl Ignition coil for motor vehicles

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
EP0638971B1 (fr) 1997-04-16

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