US2418531A - Ignition coil - Google Patents

Ignition coil Download PDF

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Publication number
US2418531A
US2418531A US310377A US31037739A US2418531A US 2418531 A US2418531 A US 2418531A US 310377 A US310377 A US 310377A US 31037739 A US31037739 A US 31037739A US 2418531 A US2418531 A US 2418531A
Authority
US
United States
Prior art keywords
coil
casing
terminal
ignition
core
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
US310377A
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English (en)
Inventor
Tognola Tullio
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.)
Bendix Aviation Corp
Original Assignee
Bendix Aviation Corp
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 Bendix Aviation Corp filed Critical Bendix Aviation Corp
Priority to US310377A priority Critical patent/US2418531A/en
Priority to GB17623/40A priority patent/GB545820A/en
Priority to FR868147D priority patent/FR868147A/fr
Application granted granted Critical
Publication of US2418531A publication Critical patent/US2418531A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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 present invention relates to ignition apparatus, and more particularly to ignition coils for transforming low voltages generated by magnetos, for example, into high voltages for providing an ignition spark in the cylinder of an internal combustion engine or the like.
  • One of the objects of the present invention is to provide a novel ignition coil assembly which will be eillcient and durable in operation.
  • Another object of the invention is to provide a novel combination of an ignition coil and radio shielding means therefor whereby the life and eillciency of the coil are materially enhanced.
  • a further object is to provide a radio-shielded ignition coil which has a high inductance and which has relatively small over-all dimensions for a coil having a given number of turns.
  • Another object is to provide an ignition coll which is so constructed and shielded that there is substantially no danger of ignition failure due to flash-overs in the coil.
  • Still another object is to provide novel means for radio shielding an electrical terminal of an ignition coil or the like.
  • Another object is to provide an emcient and durable coil which may be readily manufactured at high speed and relatively low cost.
  • a still further object is to provide a novel ignition coil assembly whereby the coil is cushioned against shock or vibration and protected from the elements as Well as from the entrance of moisture.
  • Fig. 1 is a side elevation, partly in section and with parts broken away, of one form of radio shielded ignition coil assembly embodying the present invention.
  • Fig. 2 is an end elevation of said coil assembly. partly in section and with parts broken away; and, l
  • Fig. 3 is a detailed sectional view of a portion of said coil assembly, the section being taken substantially on line 3-3 of Fig. 1.
  • a single embodiment of the invention is illus- 8 Claims. (Cl. 175-361) trated, by way of example, in the accompanying drawings in the form of a shielded ignitiony coil which is now in extensive commercial use on internal combustion engines wherein low tension current distribution in the ignition system is ernployed.
  • the coil shown is adapted to be mounted in the vicinity of the spark plug or other ignition device to which the secondary winding of the coil is connected where the available supports therefor are ordinarily subject to considerable vibration.
  • the novel construction of the coil and radio-shielding therefor render the same efficient under the most difficult of service conditions and adapt the same for long periods of use without the necessity for overhaul or replacement.
  • the novel construction of the present coil makes it possible to provide a primary winding having low resistance and, hence, increase the output for any given input, and also renders it possible to provide a secondary winding having a relatively large number of turns for any given over-al1 dimensions without the danger ci the occurrence of flash-overs.
  • the coil proper comprises an inner primary winding I0 and an outer secondary winding Il Wound on a laminated metallic core I2, Which projects from each end of the coil and engages a U-shaped laminated metallic core piece or bridge I3 to provide a closed magnetic path for the magnetic flux emanating from the primary winding IIJ.
  • a laminated metallic core I2 which projects from each end of the coil and engages a U-shaped laminated metallic core piece or bridge I3 to provide a closed magnetic path for the magnetic flux emanating from the primary winding IIJ.
  • a cylindrical casing member I4 of insulating material Surrounding the coil is a cylindrical casing member I4 of insulating material, the same being initially held in circumferentially spaced relation with respect to the coil by means of insulating end plates I5. Said plates preferably nt into the ends of cylinder I4 and are provided with central openings spaced to receive rectangular core I2. Coil Il), II may be spaced from the end plates by means of suitable blocks I6. Since the casing Il, I5 is made of insulating material, the space between the same and coil I0, Il may be relatively small.
  • One end of primary winding I 0 is preferably connected to a terminal I l ilxed on one of the end plates I5 and thence in a manner to be hereinafter pointed out to a source of low tension electrical current.
  • the opposite end of winding l0 iS conneted to ground by means of lead I8 which passes along core I2 through end plate I5 and engages the radio shielded casing to be later described.
  • the inner or starting end of secondary winding isA also connected to terminal
  • I is connected to a coil spring terminal I9 which is xed in the periphery of cylinder I4 midway between the ends thereof.
  • 9a is constituted by a cashew-nut-shell oil product of the character disclosed in Harvey Patents Nos. 1,725,797 and 1,838,077.
  • This product in the form of a high viscosity liquid may be mixed with a small quantity of formaldehyde or other suitable drying agent and introduced into casing
  • the filled coil may then ⁇ be placed in an oven and heated for several hours at a temperature of approximately 120 F. to 135 F. until the compound is dry throughout.
  • the drying is actually brought about by chemical reaction without noticeable shrinkage but is accelerated by the application of heat.
  • the dried compound which is solid, but of a resilient spongy nature, serves as an excellent dielectric, is not sticky, will not crack and is not adversely affected by heat. Additionally, said compound completely fills the entire free space around the coil and renders material assistance in preventing any loosening of the coil windings.
  • the novel combined radio-shield and protective casing comprehended by the present invention for housing the above described coil assembly is constituted primarily by a bottom section and a cover section 2
  • ) is shaped to receive the lower half of the abovedescribed coil assembly, that is, the lower half of casing
  • Core piece I3 may iit rather snugly into reduced portions 22 (Fig. 2) at the ends and bottom of section 2
  • is shaped in a manner similar to section 20 to receive the upper half of coil casing
  • is a neck portion 23 in alignment with spring terminal I9 and having an opening in the upper end thereof.
  • engage each other to form a closed casing around the coil assembly and are provided with cooperating ears 24 and 25, respectively, for receiving screws 26 or other suitable securing means whereby the same are secured together.
  • an externally threaded nipple 28 is fixed in the opening in neck 23 by spinning the reduced inner end of the nipple outwardly beneath an internal flange on said neck as shown at 29, an external shoulder on the nipple being adapted to engage the outer end of said neck.
  • the bore through nipple 23 is cone-shaped at the outer end thereof to form a seat 30 for a rubber grommet or washer 3
  • an insulating ring 33 Surrounding spring terminal I9 and firmly engaging cylinder I4 is an insulating ring 33 which is preferably made of a suitable resilient material which is an electrical insulator. Interposed between said ring and shoulder 32 is a rigid insulating tube or socket member 34. The various parts are preferably proportioned so that when the same are in assembled relation they form relatively tight joints separating the space within tube 34 from the space outside of said tube in casing 2D, 2
  • the projecting portion of cable 21 is preferably encased in a. radio-shielding tube of any wellknown construction which is, in turn, provided with a flanged ferrule 31, whereby the tube is held in electrical engagement with nipple 29 by an internally flanged nut 38.
  • Ferrule 31 also engages grommet or washer 3
  • Bolt 40 extends through but does not contact a novel adapter 42 which is provided with a lower portion adapted to slideably fit into a non-circular opening in casing section 2
  • Terminal bolt 40 is insulated from casing 20, 2
  • Cable 39 is electrically connected and secured to terminal bolt 40 by means of a nut which may, like nut 49, be applied through an internally threaded opening 5
  • may be secured to the inner end of bolt 40 by any suitable means such as a nut 53.
  • terminal 40 is secured in place and connected to lead 4
  • the coil, together with socket portions 33 and 34, are then held in assembled position within casing section 2
  • the entire assembly is placed in an evacuated chamber, filled with a compound 54 which may be-the same or similar to the compound with which casing I4, I5 was filled. and then baked to dry said compound.
  • Coil I0 is thus doubly cushioned against the detrimental effects of vibration and doubly protected against the entrance of moisture or the like in any form whatsoever.
  • the coil per se and the shielding casingr therefor may be simultaneously iilled under vacuum with the insulating filler compound.
  • the latter is preferably forced into the coil assembly through an opening under atmospheric pressure while the body of the assembly is in an evacuated chamber.
  • casing section is provided With a pair of bosses 56. The latter are bored at 55 for receiving securing bolts. A rigid durable securing means is thus provided.
  • a novel ignition coil and radio-shielding therefor which is particularly adapted for use in connection with low speed magnetos having low current output and for use in low tension distribution ignition systems on internal combustion engines.
  • a novel shielded coil which is of simple, easy construction and yet rugged and eiilcient is also provided.
  • the entire coil assembly is moistureproof and so constructed that moisture condensation cannot take place therein.
  • the coil is so constructed that substantially the sole insulation therefor serves as shock absorbing means and is of such nature that it will not crack and provide easy paths for flash-overs.
  • Novel terminal shielding means are also provided.
  • a device of the class described comprising an ignition coil including primary and secondary windings, a rigid insulating housing for said coil, an electric terminal connected to one of said windings, a metallic casing surrounding said coil and having an opening therein, and socket means comprising a rigid tube of insulating material and a resilient tube of insulating material interposed end-to-end between said casing and housing with the bores of said tubes in alignment with said opening and said terminal.
  • a device of the class described comprising an ignition coil including a metallic core, a primary winding around a. portion of said core intermediate the ends thereof and a secondary winding around said primary winding, an insulating housing for said windings, an insulating compound substantially lling the space in said housing around said coil, a metallic bridge engaging the ends of said core to form aclosed magnetic flux path, an outlet terminal on the periphery of said housing intermediate the ends thereof connected to said secondary winding, a metallic casing surrounding said coil and bridge, a socket for slidably receiving an insulated conductor comprising a rigid tube of'insulating material and a resilient ring of insulating material, said tube and ring being in alignment with each 6. other, said terminal and an opening in said'casing and interposed between said casing and said housing, and a resilient insulating compound illl-l ing the space in said casing around said coil and socket.
  • a device of the class described comprising an ignition coil including a metallic core, a. primaryl winding around a portion of said core intermediate the ends thereof and a secondary winding around said primary winding, an insulating housing for said windings, an insulating compound substantially iilling the space in s aid housing around said coil, ametallic bridge engaging the ends of said core to form a closed magnetic flux path, an outlet terminal on the periphery of said housing intermediate the ends thereof connected to said secondary winding, a metallic casing surrounding said coil and bridge, a socket for slidably receiving an insulated conductor comprising a rigid tube of insulating material and a resilient ring ofinsulating material, said tube and ring being in alignment with each other, said terminal and an opening in said casing and interposed between said casing and said housing, and a resilient insulating compound lling the space in said casing around said coil and socket.
  • a device of the class described comprising a metallic casing having upper and lower sections, means for securing said sections together, U- shaped metallic bridge means tightly fitted into a groove in said lower section, an ignition coil assembly including a metallic core, the ends of said core resting on the ends of said bridge means to form a closed magnetic path, tubular insulating means in said upper section to form a connector socket between the wall of the casing and said coil assembly, and resilient insulating means completely filling the space in said casing around said coil assembly and socket.
  • a device of the class described comprising a metallic casing having upper and lower sections, means for securing said sections together, U- shaped metallic bridge means tightly fitted into a groove in said lower section, an ignition coil assembly including a metallic core, the latter having the ends thereof engaging the ends of said bridge means to form a closed path for magnetic ilux, and tubular insulating means interposed between said coill assembly and the wall of said upper section to form a socket for a connector plug, said coil having a high tension terminal at the inner end of said socket and said tubular means beingat least partially resilient for yieldably holding said core in engagement with said bridge means.
  • a device of the class described comprising a metallic casing having upper and lower sections, said lower section having an internal groove and said upper section having a bottleneck portion, U-shaped metallic bridge means tightly fitted into said groove, an ignition coil assembly including a metallic core, the ends of said core having engagement with the ends of said bridge means for forming a closed path for magnetic flux, and axially yieldable tubular insulating means communicating with an opening in said bottleneck portion and engaging the outer wall of said coil assembly to form a socket for a connector plug, said coil assembly having a high tension terminal at the inner end of said socket.
  • a device of the class described comprising a coil, a terminal connected to the winding of said coil, a rigid casing surrounding said coil and having van opening therein, and socket means comprising a rigid tube of insulating material and a resilient tube of insulating material, said tubes being in axial alignment and interposed between said casing and coil in alignment with said opening and said terminal.
  • a device of the class described comprising a coil, a housing for said coil, a terminal on said housing connected to said coil, a ,casing surrounding said housing and having an opening therein, and socket means comprising a rigid tube of insulating material and a. resilient tube of insulating material in axial alignment and interposed between said casing and housing, the bores of said tubes being in alignment with said opening and said terminal.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US310377A 1939-12-21 1939-12-21 Ignition coil Expired - Lifetime US2418531A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US310377A US2418531A (en) 1939-12-21 1939-12-21 Ignition coil
GB17623/40A GB545820A (en) 1939-12-21 1940-12-12 Improvements in and relating to ignition coils for internal combustion engines
FR868147D FR868147A (fr) 1939-12-21 1940-12-16 Perfectionnements aux bobines d'allumage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US310377A US2418531A (en) 1939-12-21 1939-12-21 Ignition coil

Publications (1)

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US2418531A true US2418531A (en) 1947-04-08

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US (1) US2418531A (fr)
FR (1) FR868147A (fr)
GB (1) GB545820A (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802970A (en) * 1957-08-13 Ignition apparatus
US2805399A (en) * 1955-10-04 1957-09-03 William W Leeper Connector for uniting coaxial cables
US2810112A (en) * 1953-01-26 1957-10-15 Gen Electric Transformer
US2839592A (en) * 1958-06-17 Ignition devices
US2914600A (en) * 1952-09-05 1959-11-24 Chicago Telephone Of Californi Embedded coil and method of manufacturing
DE1148814B (de) * 1956-02-10 1963-05-16 Bernhard Niedner Dipl Ing Entstoerte Zuendanlage fuer Ottomotoren
US4159441A (en) * 1977-11-30 1979-06-26 Livingston Industries Incorporated Shielding and retaining system for vehicle engine electrical components
US4516558A (en) * 1982-06-30 1985-05-14 Mitsubishi Denki Kabushiki Kaisha Ignition coil device for internal combustion engine
DE3505367A1 (de) * 1985-02-15 1986-08-28 Daimler-Benz Ag, 7000 Stuttgart Zuendspule fuer brennkraftmaschinen
US4683454A (en) * 1985-10-31 1987-07-28 Automatic Switch Company Solenoid actuator with electrical connection modules
US4736177A (en) * 1985-10-31 1988-04-05 Automatic Switch Company Solenoid actuator with electrical connection modules

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464029A (en) * 1945-04-07 1949-03-08 Gen Electric Method of making transformers
JPS595612A (ja) * 1982-06-30 1984-01-12 Mitsubishi Electric Corp 内燃機関用点火コイル
DE3311775C1 (de) * 1983-03-31 1984-06-20 Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen Transformator fuer die Ablenkung von Elektronenstrahlen
JP2917768B2 (ja) * 1993-10-04 1999-07-12 三菱電機株式会社 内燃機関用点火コイル装置

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US704589A (en) * 1902-04-30 1902-07-15 Charles F Splitdorf Sparking-coil casing.
US1116013A (en) * 1913-08-02 1914-11-03 Western Electric Co Paper condenser.
US1333004A (en) * 1917-08-13 1920-03-09 Francis A Vaughn Method of insulating and protecting transformers or other electrical apparatus
US1455199A (en) * 1920-02-26 1923-05-15 Connecticut Telephone & Elec Coil and condenser treatment
US1608891A (en) * 1926-02-03 1926-11-30 North East Electric Co Ignition coil
US1629132A (en) * 1925-02-27 1927-05-17 Chester H Thordarson Electric jump-spark coil
US1725797A (en) * 1928-06-15 1929-08-27 Harvel Corp Cashew-nut-shell oil condenser product and process for making same
US1838077A (en) * 1929-06-20 1931-12-22 Harvel Corp Composition for electrical insulation and other purposes and method and steps of making and using the same
US1908798A (en) * 1932-05-27 1933-05-16 Ford Motor Co Ignition coil
US1943240A (en) * 1932-09-27 1934-01-09 Mallory & Co Inc P R Magnetic interrupter
US1969866A (en) * 1933-07-08 1934-08-14 United American Bosch Corp Radio shielded cable fastener
US2017204A (en) * 1932-03-08 1935-10-15 Aerovox Corp Electrical terminal
US2028942A (en) * 1935-09-18 1936-01-28 Crosley Radio Corp Electrical entrance plug
US2141331A (en) * 1930-10-13 1938-12-27 Eclipse Aviat Corp Engine starting apparatus
US2156487A (en) * 1938-10-10 1939-05-02 Utah Radio Products Company Vibrator
US2159120A (en) * 1930-10-13 1939-05-23 Eclipse Aviat Corp Electrical apparatus
US2266811A (en) * 1939-09-19 1941-12-23 Ruben Samuel Dielectric for electrostatic condensers and the like

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US704589A (en) * 1902-04-30 1902-07-15 Charles F Splitdorf Sparking-coil casing.
US1116013A (en) * 1913-08-02 1914-11-03 Western Electric Co Paper condenser.
US1333004A (en) * 1917-08-13 1920-03-09 Francis A Vaughn Method of insulating and protecting transformers or other electrical apparatus
US1455199A (en) * 1920-02-26 1923-05-15 Connecticut Telephone & Elec Coil and condenser treatment
US1629132A (en) * 1925-02-27 1927-05-17 Chester H Thordarson Electric jump-spark coil
US1608891A (en) * 1926-02-03 1926-11-30 North East Electric Co Ignition coil
US1725797A (en) * 1928-06-15 1929-08-27 Harvel Corp Cashew-nut-shell oil condenser product and process for making same
US1838077A (en) * 1929-06-20 1931-12-22 Harvel Corp Composition for electrical insulation and other purposes and method and steps of making and using the same
US2159120A (en) * 1930-10-13 1939-05-23 Eclipse Aviat Corp Electrical apparatus
US2141331A (en) * 1930-10-13 1938-12-27 Eclipse Aviat Corp Engine starting apparatus
US2017204A (en) * 1932-03-08 1935-10-15 Aerovox Corp Electrical terminal
US1908798A (en) * 1932-05-27 1933-05-16 Ford Motor Co Ignition coil
US1943240A (en) * 1932-09-27 1934-01-09 Mallory & Co Inc P R Magnetic interrupter
US1969866A (en) * 1933-07-08 1934-08-14 United American Bosch Corp Radio shielded cable fastener
US2028942A (en) * 1935-09-18 1936-01-28 Crosley Radio Corp Electrical entrance plug
US2156487A (en) * 1938-10-10 1939-05-02 Utah Radio Products Company Vibrator
US2266811A (en) * 1939-09-19 1941-12-23 Ruben Samuel Dielectric for electrostatic condensers and the like

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802970A (en) * 1957-08-13 Ignition apparatus
US2839592A (en) * 1958-06-17 Ignition devices
US2914600A (en) * 1952-09-05 1959-11-24 Chicago Telephone Of Californi Embedded coil and method of manufacturing
US2810112A (en) * 1953-01-26 1957-10-15 Gen Electric Transformer
US2805399A (en) * 1955-10-04 1957-09-03 William W Leeper Connector for uniting coaxial cables
DE1148814B (de) * 1956-02-10 1963-05-16 Bernhard Niedner Dipl Ing Entstoerte Zuendanlage fuer Ottomotoren
US4159441A (en) * 1977-11-30 1979-06-26 Livingston Industries Incorporated Shielding and retaining system for vehicle engine electrical components
US4516558A (en) * 1982-06-30 1985-05-14 Mitsubishi Denki Kabushiki Kaisha Ignition coil device for internal combustion engine
DE3505367A1 (de) * 1985-02-15 1986-08-28 Daimler-Benz Ag, 7000 Stuttgart Zuendspule fuer brennkraftmaschinen
US4736179A (en) * 1985-02-15 1988-04-05 Daimler-Benz Ag Ignition coil for internal combustion engines
US4683454A (en) * 1985-10-31 1987-07-28 Automatic Switch Company Solenoid actuator with electrical connection modules
US4736177A (en) * 1985-10-31 1988-04-05 Automatic Switch Company Solenoid actuator with electrical connection modules

Also Published As

Publication number Publication date
FR868147A (fr) 1941-12-18
GB545820A (en) 1942-06-15

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