EP0785605A1 - Zündspulenvorrichtung für Verbrennungsmotor - Google Patents

Zündspulenvorrichtung für Verbrennungsmotor Download PDF

Info

Publication number
EP0785605A1
EP0785605A1 EP96120613A EP96120613A EP0785605A1 EP 0785605 A1 EP0785605 A1 EP 0785605A1 EP 96120613 A EP96120613 A EP 96120613A EP 96120613 A EP96120613 A EP 96120613A EP 0785605 A1 EP0785605 A1 EP 0785605A1
Authority
EP
European Patent Office
Prior art keywords
core
coil device
circular section
bobbin
coil
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.)
Withdrawn
Application number
EP96120613A
Other languages
English (en)
French (fr)
Inventor
Makoto Sakamaki
Toshiyuki Shinozawa
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.)
Toyo Denso Co Ltd
Original Assignee
Toyo Denso Co Ltd
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 Toyo Denso Co Ltd filed Critical Toyo Denso Co Ltd
Publication of EP0785605A1 publication Critical patent/EP0785605A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • 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 open-magnetic-circuit type engine igniting coil device.
  • Japanese Laid-Open Patent No. 54-63317 discloses an open-magnetic-circuit type engine igniting coil device which comprises a primary coil bobbin having a hollow shaft with a rod-shape core inserted therein and a secondary coil bobbin coaxially laid on the primary coil bobbin and which is characterized in that the primary coil bobbin accommodates thin strips irregularly inserted in tight therein in order to accommodate the core in the primary-coil-bobbin's hollow shaft having a circular section with a high space factor therein for generating a magnetic flux enough to obtain an improved output efficiency of a secondary voltage.
  • Japanese Laid-Open Patent No. 5-87311 discloses an engine igniting coil device that has a primary coil bobbin with a hollow axis having a circular section in which metal wires having regular hexagonal section are densely inserted.
  • an object of the present invention is to provide an engine igniting coil device which is an open-magnetic-circuit type, wherein a coil bobbin has a hollow shaft having a circular section and accommodating therein a core with a high space factor and said core is a lamination of iron plates having different widths and having a nearly circular cross-section.
  • Another object of the present invention is to provide an engine igniting coil device that is an open-magnetic-circuit type, wherein a core formed of laminations of iron plates is split into a plurality of parts in a direction perpendicular to the lamination to improve an output efficiency of a secondary voltage by effectively reducing an eddy current core loss.
  • Fig. 1 is a sectional front view of an engine igniting coil device embodying the present invention.
  • Fig. 2 is a sectional side view of a core of the engine igniting coil device shown in Fig. 1.
  • Fig. 3 is a sectional side view of a cylindrical case of the engine igniting coil device shownin Fig. 1.
  • Fig. 4 is a plan view showing an internal structure of a low-voltage terminal socket of the engine igniting coil device shown in Fig. 1.
  • Fig. 5 is a plan view of a low-voltage terminal socket with an igniter mounted thereon.
  • Fig. 6 is a sectional side view of an example of a split core.
  • Fig. 7 is a sectional side view of another example of a split core.
  • Fig. 8 is a graph showing secondary voltage output characteristics of a device with a split core and a device with split core.
  • Fig. 9 shows variations of lamination of a core to be inserted in a hollow axis of a bobbin.
  • Fig. 10 shows space factors of respective cores shown in Fig. 9 and inserted in a hollow axis of a bobbin.
  • an engine igniting coil device has a coil case 1 composed of a cylindrical case 2 and a case 3 having a small tubular hole 4 in its center portion and fitted in an open end of the case 2 to form a closed end of the coil case 1.
  • the coil case 1 accommodates an assembly of a coil bobbin 6 with a primary coil 5 having a hollow shaft with a rode-shape core 9 inserted therein and a coil bobbin 8 with a secondary coil 7 coaxially mounted on the coil bobbin 6.
  • the core 9 isprovided ateach end with a permanent magnet 10 for obtaining a large change in magnetic flux with an interrupted primary current.
  • the core 9 is formed in such a manner that iron plates having different widths are laminated to form a nearly circular section and jointed to each other by caulking to form a single body.
  • the caulked portion is indicated with a broken line in Fig. 2.
  • the core 9 is accommodated in the hollow cylindrical shaft of the primary coil bobbin 6, attaining an increased space factor of the core 9 therein.
  • the coil device can get an increased efficiency of generating magnetic flux and thereby an improved output efficiency of its secondary voltage.
  • the core 9 is an integrally caulked lamination of iron plates forming a nearly circular section and can therefore be easily mounted in the coil bobbin 6.
  • Fig. 9 illustrates variations of laminated cores composed of a plurality of 0.35 mm thick iron plates.
  • a cross-section area of a hollow shaft is 50.27 mm 2 and a sectional area of a core ⁇ a ⁇ is 31.99 mm 2 .
  • a space factor of the core ⁇ a ⁇ in the hollow shaft is 63.6%.
  • a sectional area of a core ⁇ b ⁇ is 39.44 mm 2 and a space factor of the core ⁇ b ⁇ in the hollow shaft is 78.5%. Namely, an increasing ratio of the space factor of the core is 23.3%.
  • a sectional area of a core ⁇ c ⁇ is 42.56 mm 2 and a space factor of the core ⁇ c ⁇ in the hollow shaft is 84.7% with an increasing ratio of 7.7%.
  • a sectional area of a core ⁇ d ⁇ is 44.20 mm 2 and a space factor of the core ⁇ d ⁇ in the hollow shaft is 87.9% with an increasing ratio of 3.9%.
  • a sectional area of a core ⁇ e ⁇ is 45.45 mm 2 and a space factor of the core ⁇ e ⁇ in the hollow shaft is 90.4% with an increasing ratio of 2.8%.
  • a sectional area of a core ⁇ f ⁇ is 46.27 mm 2 and a space factor of the core ⁇ f ⁇ in the hollow shaft is 92.0% with an increasing ratio of 1.8%.
  • a sectional area of a core ⁇ g ⁇ is 46.73 mm 2 and a space factor of the core ⁇ g ⁇ in the hollow shaft is 93.0% with an increasing ratio of 1.0%.
  • a sectional area of a core ⁇ h ⁇ is 47.16 mm 2 and a space factor of the core ⁇ h ⁇ in the hollow shaft is 93.8% with an increasing ratio of 0.9%.
  • Fig. 10 shows space-factor characteristics of respective cores ⁇ a ⁇ - ⁇ h ⁇ .
  • the cores ⁇ d ⁇ - ⁇ h ⁇ are suitable to use in practice since increasing ratios of their space factors are small and constant.
  • the core 9 formed by laminating a plurality of iron plates is divided in a direction perpendicular to the plate laminating direction.
  • the core 9 By dividing the core 9 into small component parts, it becomes possible to reduce an eddy current core loss. As a result, the magnetic flux generating efficiency is increased and the output efficiency of a secondary voltage of the coil device is improved.
  • Divided core portions 91and 92 are separately laminated and caulked. Caulked portions are indicated with broken lines.
  • the present invention is not limited to the above-mentioned core 9 which is made by laminating a plurality of iron plates having different widths to form a nearly circular section and then splitted in the direction perpendicular to the plate laminating direction, and it also proposes a core 9', shown in Fig. 7, which is made of laminations of iron plates forming a square section and splitted in a direction perpendicular to the plate laminating direction.
  • This split laminated core 9' having a square cross-section can effectively improve the flux generating efficiency.
  • the core 9' being laminations of iron plates having a square section is divided into 4 divisions in a direction perpendicular to the plate laminating direction. Divided components of the core 9' must have a width of not less than 2.8 mm for caulking.
  • the caulking portions are indicated with a broken line in Fig. 7.
  • Laminated iron plates may also be jointed together to form a single core by welding or bonding (besides by caulking).
  • the laminated core may be divided into components having smaller width (than 2.8 mm), which can therefore prevent an eddy current loss more effectively.
  • the plate width restriction may be relaxed.
  • Fig. 8 shows output characteristics of two cores 9' (i.e., a core composed of 4 split parts and a single solid core, which are similar in structure and mounted in the coil bobbins of the same structure). Namely, two curves indicate changes of secondary voltages of two above-mentioned cores, respectively, as currents in their primary coils change under the same conditions.
  • a high-voltage terminal holder 11 is provided as a center projection formed integrally with the flanged end portion of the secondary coil bobbin 8 and a high-voltage terminal 12 bonded to the holder 11 has a contact 13 attached thereto for providing electrical connection with an ignition plug 15.
  • An assembly of the primary coil bobbin 6, secondary coil bobbin 8, high-voltage terminal 12 and contact 13 is mounted at a given place and fixed in the coil case 1 in such a manner that a holder portion of the high-voltage terminal 12 is press-fitted in the small hole 4 of the coil case 1 and the contact 13 outwardly projected from the small hole 4.
  • the coil case 1 with the assembly fixed at the given place therein is filled with melted insulating resin injected through an open-end of the coil case 1 to form a single solid device.
  • the permanent magnets 10 attached one to each end of the core 9 are covered with damping members 14, respectively, which can prevent intrusion of melted resin into the core 9 and absorb relatively large thermal stress produced in the longitudinal direction of the core 9, thus preventing cracking of the resin layer formed round the core 9.
  • a space formed between the primary coil bobbin 6 and the secondary coil bobbin 8 is filled with melted resin entered therein through a plurality of holes 18 made in the high-voltage terminal holder 11 of the flanged end portion of the secondary coil bobbin 8.
  • Two bobbins are fixed to each other with the resin layer solidified therebetween.
  • the case 3 also functions as a connector of an ignition plug 15 and is provided at its top end with a plug rubber 16 for holding the ignition plug 15.
  • a tip of the ignition plug 15 comes into contact with the contact 13, thus making electrical connection of the ignition coil device.
  • the case 2 made of dielectomagnetic material having a high permeability, e.g., silicone steel, which has an electromagnetic shielding effect and acts as a side core for concentrating a lager portion of magnetic flux produced by the open-magnetic-circuit type core 9 to the case 2, thus preventing loss of the produced magnetic flux by passing a cylinder block of the engine not to cause a drop of a secondary output voltage.
  • the case 2 itself has a thermal radiation effect.
  • the case 2 has a slit 33 to form a gap of 0.5 to 1.5 mm in longitudinal direction and a C-shaped section to minimize an eddy current core loss.
  • the case 2 is internally covered with an elastic member 17 (e.g., rubber, elastomer) which separates resin layer from the inner wall of the case 2 and absorbs thermal stress of metal, thus preventing the resin layer from cracking.
  • an elastic member 17 e.g., rubber, elastomer
  • the case 3 has a plurality of ribs 30 formed between the small hole 4 and the side wall to assure an insulation distance between the high-voltage terminal 12 fitted in the small hole 4 and the case 2.
  • a low-voltage terminal socket 18 is fitted in an upper end of the case 2 and accommodates therein an igniter 19.
  • the low-voltage-terminal socket 18 is fitted on an outwardly bent portion 29 of the elastic member 17 provided on the inside wall of the case 2 to assure a high sealing quality.
  • Fig. 4 shows an internal structure of the low-voltage-terminal socket holder 18 with the removed cap 20.
  • Fig. 5 shows the low-voltage-terminal socket holder 18 with an igniter 19 mounted therein.
  • the cap 20 has a plurality of the ribs 21 that serve as a cushion for dispersing thermal stress to the resin layer, thus preventing cracking of the resin layer on the igniter 19.
  • the case 2 under the low-voltage-terminal socket holder 18 is provided with a rubber seal 24 that is used when the coil case 1 is mounted in cylinder bore 23 made in a cylinder head portion of an engine.
  • this ignition coil device With the coil case 1 embedded in the cylinder bore 23, this ignition coil device is secured at its flange 25 to the cylinder head with a bolt 26 through the flange 25 integrally formed with the holder 18.
  • a plug rubber 16 has a flange 36 formed at its circumference.
  • This flange 36 has the same diameter as the diameter of the cylinder bore 23 and serves as a guide for inserting the coil case 1 into the cylinder bore 23 to assure the reliable connection with the ignition plug 15.
  • the engine vibration transmitted through the ignition plug 15 to the coil case 1 is absorbed by the flange 23.
  • the vibration applied to electrical connections between the contact 13 and the ignition plug 15 can be suppressed. The durability of the device is thus improved.
  • the present invention provides an engine igniting coil device that has the following improvements:
  • a rod-shape core inserted in a hollow shaft of an ignition coil bobbin is made of laminations of different in width iron plates forming a nearly circular cross-section of the core and, therefore, can attain an increased space factor in the hollow shaft of the bobbin, thus effectively increasing the output efficiency of the secondary voltage of the ignition coil device.
  • the core is separately manufactured as a unit part that is easy to mount in the hollow shaft of the coil bobbin. This is desirable for mass production of the proposed ignition coil devices for engines.
  • the ignition coil device also can use a split core that is formed of laminations of iron plates and is further split into a plurality of parts in a direction perpendicular to the plate laminating direction and which can therefore reduce an eddy current core loss effectively to improve an output efficiency of the second voltage of the ignition coil device.
  • the core is formed of a plurality of iron plates having different widths and laminated to have a substantially circular section and the thus formed core is splitted in the direction perpendicular to the lamination into a plurality of parts in order to increase a space factor of the core in the bobbin's hollow axis having a circular section and to easily accommodate the core in the bobbin's hollow axis having a circular section assuring a high space factor of the core therein and reducing eddy-current core-loss to improve an output factor of a secondary voltage.

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)
EP96120613A 1996-01-19 1996-12-20 Zündspulenvorrichtung für Verbrennungsmotor Withdrawn EP0785605A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP38634/96 1996-01-19
JP8038634A JPH09199349A (ja) 1996-01-19 1996-01-19 エンジンの点火コイル装置

Publications (1)

Publication Number Publication Date
EP0785605A1 true EP0785605A1 (de) 1997-07-23

Family

ID=12530681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96120613A Withdrawn EP0785605A1 (de) 1996-01-19 1996-12-20 Zündspulenvorrichtung für Verbrennungsmotor

Country Status (4)

Country Link
EP (1) EP0785605A1 (de)
JP (1) JPH09199349A (de)
KR (1) KR100222461B1 (de)
TW (1) TW359720B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6092278A (en) * 1999-03-31 2000-07-25 Tempel Steel Company Method for manufacturing a pencil-shaped core
FR2818001A1 (fr) * 2000-12-13 2002-06-14 Sagem Bobine d'allumage a entrefer optimise

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002231543A (ja) * 2001-01-31 2002-08-16 Diamond Electric Mfg Co Ltd 内燃機関用点火コイル
JP2006179597A (ja) * 2004-12-21 2006-07-06 Diamond Electric Mfg Co Ltd 内燃機関用点火コイル
DE102006019296A1 (de) * 2006-04-26 2007-10-31 Robert Bosch Gmbh Zündspule, insbesondere für eine Brennkraftmaschine eines Kraftfahrzeugs
JP2007324436A (ja) * 2006-06-02 2007-12-13 Denso Corp 点火コイル
JP5923460B2 (ja) * 2013-06-14 2016-05-24 ダイヤモンド電機株式会社 点火コイル用誘磁鉄芯，及び，これを備える内燃機関用点火コイル
JP6019047B2 (ja) * 2014-01-09 2016-11-02 ダイヤモンド電機株式会社 内燃機関用の点火コイル

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632132A (en) * 1951-06-15 1953-03-17 Delano James Kendall Spark plug
US3137832A (en) * 1960-12-27 1964-06-16 Gen Electric Laminated magnetic core structure
DE2745990A1 (de) * 1977-10-13 1979-04-19 Bosch Gmbh Robert Kern fuer eine elektrische spule, insbesondere fuer eine zur zuendeinrichtung einer brennkraftmaschine gehoerende zuendspule
GB2130806A (en) * 1982-11-24 1984-06-06 Bosch Gmbh Robert An ignition coil for the ignition system of an internal combustion engine
JPH0587311A (ja) 1991-03-22 1993-04-06 Primus Ab ランタン用バーナー
EP0716436A1 (de) * 1994-12-06 1996-06-12 Nippondenso Co., Ltd. Zündspule für eine Brennkraftmaschine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632132A (en) * 1951-06-15 1953-03-17 Delano James Kendall Spark plug
US3137832A (en) * 1960-12-27 1964-06-16 Gen Electric Laminated magnetic core structure
DE2745990A1 (de) * 1977-10-13 1979-04-19 Bosch Gmbh Robert Kern fuer eine elektrische spule, insbesondere fuer eine zur zuendeinrichtung einer brennkraftmaschine gehoerende zuendspule
JPS5463317A (en) 1977-10-13 1979-05-22 Bosch Gmbh Robert Core for electric coil
GB2130806A (en) * 1982-11-24 1984-06-06 Bosch Gmbh Robert An ignition coil for the ignition system of an internal combustion engine
JPH0587311A (ja) 1991-03-22 1993-04-06 Primus Ab ランタン用バーナー
EP0716436A1 (de) * 1994-12-06 1996-06-12 Nippondenso Co., Ltd. Zündspule für eine Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6092278A (en) * 1999-03-31 2000-07-25 Tempel Steel Company Method for manufacturing a pencil-shaped core
FR2818001A1 (fr) * 2000-12-13 2002-06-14 Sagem Bobine d'allumage a entrefer optimise

Also Published As

Publication number Publication date
KR970059491A (ko) 1997-08-12
JPH09199349A (ja) 1997-07-31
TW359720B (en) 1999-06-01
KR100222461B1 (ko) 1999-10-01

Similar Documents

Publication Publication Date Title
EP0951028B1 (de) Zündspulenvorrichtung für Verbrennungsmotor
EP0782231B1 (de) Zündspulenvorrichtung für Verbrennungsmotor
US5349320A (en) Ignition coil for internal combustion engines
US5101803A (en) Ignition coil
US6011457A (en) Engine igniting coil device
US5929736A (en) Engine igniting coil device and method of winding an ignition coil
EP0785605A1 (de) Zündspulenvorrichtung für Verbrennungsmotor
US6337616B1 (en) Ignition coil for internal-combustion engine
JPH0917662A (ja) 内燃機関用点火装置
JP3550643B2 (ja) 内燃機関用点火コイル
JP3250135B2 (ja) エンジンの点火コイル装置
JP3587024B2 (ja) 内燃機関用点火コイル
JP3250136B2 (ja) エンジンの点火コイル装置
JP2004304199A (ja) 内燃機関用点火コイル
JPH09246074A (ja) 内燃機関用点火コイル
JP3028692U (ja) 内燃機関の点火コイル
JPH1074646A (ja) エンジンの点火コイル装置
JPH1074650A (ja) エンジンの点火コイル装置
JPH09167711A (ja) 内燃機関用点火コイル
JPS608420Y2 (ja) 点火コイル
JPH03136219A (ja) 内燃機関用点火コイル
JPH09186033A (ja) エンジンの点火コイル装置
JPH0963873A (ja) 内燃機関用点火装置
JP2004186578A (ja) 点火コイル

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

17P Request for examination filed

Effective date: 19970725

17Q First examination report despatched

Effective date: 19971010

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19980221