US3683880A - Magnetic ignition distributor - Google Patents

Magnetic ignition distributor Download PDF

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Publication number
US3683880A
US3683880A US82025A US3683880DA US3683880A US 3683880 A US3683880 A US 3683880A US 82025 A US82025 A US 82025A US 3683880D A US3683880D A US 3683880DA US 3683880 A US3683880 A US 3683880A
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US
United States
Prior art keywords
magnetic
yoke
primary winding
secondary windings
core
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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
US82025A
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English (en)
Inventor
Mario Palazzetti
Bruno Cavallarin
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Individual
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Individual
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Publication date
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Publication of US3683880A publication Critical patent/US3683880A/en
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    • 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
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
    • F02P7/03—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors with electrical means

Definitions

  • a magnetic ignition distributor for an internal combustion engine comprising a transformer having a primary winding and a number of secondary windings, each secondary winding being connected to a respective spark plug.
  • the secondary windings are arranged around the primary winding and each winding has a magnetic core the ends of which are all flush with each other.
  • a yoke of magnetic material is provided to complete a magnetic circuit between the primary and one of the secondary windings, and this yoke is arranged to be rotatable about the axis of the core of the primary winding so that each secondary core is coupled into the magnetic circuit in turn.
  • the rate at which the yoke rotates being governed by the speed of the engine. 1
  • the present invention relates to a distributor for the ignition circuit of an internal combustion engine and finds particular utility in the ignition circuits of internal combustion engines of motor vehicles.
  • a high voltage is supplied to the ignition sparking plugs by an electric distributor which by means of a rotor arm, driven directly or indirectly by the motor, selectively connects the secondary of the high voltage transformer (or coil) with each sparking plug.
  • an electric distributor of this type has a number of disadvantages due to the electrical nature of its operation. Probably the most important of these disadvantages from the point of view of safety of the passengers is that an electric distributor, in operation, induces a spark which, in the case of an accident may cause a fire by igniting any spilt petrol; this is clearly to be avoided if at all possible.
  • a magnetic ignition distributor for internal combustion engines comprising a primary winding having a core of magnetic material, a plurality of secondary windings for connection to respective spark plugs, each secondary winding having a core of magnetic material, and a rotatably mounted yoke of magnetic material the axis of rotation of which is coaxial with the magnetic core of the primary winding, the said yoke being rotatable at a speed related to the speed of the engine to complete a magnetic circuit between the core of the primary winding and the core of each of the secondary windings in turn.
  • a fixed yoke which cooperates with the ends of the magnetic cores remote from the rotatable yoke to form the remainder of the magnetic circuit.
  • FIG. 1 shows a longitudinal section of one embodiment of a distributor constructed in accordance with the present invention and one possible drive system for the rotating yoke;
  • FIG. 2 is a transverse section taken along the line II- II of FIG. 1.
  • FIG. 1 there is shown a distributor generally indicated 10, the distributor has a mechanical driving gear 11 which is driven by the engine with which the distributor is associated, the driving gear 11 comprises a driving chain and a co-operating gear wheel 12.
  • the distributor as is better seen in FIG. 2, comprises a transformer having a central core 13 on to which the primary winding 14 is wound, and a number of other cores I5 spaced around the central core 13, each bearing a corresponding secondary winding 16.
  • the magnetic cores 15, and hence the secondary windings, are equal in number to the ignition sparking plugs of the engine.
  • the magnetic cores of all of the windings are the same length; a fixed yoke 17 is arranged to overly one end of all of the cores 13, 15 to provide a path for magnetic flux from the core 13 of the primary winding 14 to the cores 15 of the secondary windings 16.
  • This yoke comprises a plate of ferro-magnetic material 17 conveniently fixed onto the casing 20 of the distributor.
  • a rotatably mounted yoke 22 also of ferromagnetic material.
  • the axis of rotation of the yoke 22 is coaxial with the axis of the core 13.
  • the rotatably mounted yoke 22 is secured to a shaft 21 and arranged to define an air-gap T between itself and the magnetic cores 13, 15.
  • the speed of rotation of the shaft 22, and therefore the rotatable yoke 22 is controlled in dependence on the speed of the engine.
  • the yoke 22 is so shaped that it completes a magnetic circuit formed by the magnetic core 13 of the primary winding 14 and each of the cores 15 of the secondary windings 16 in turn as it rotates.
  • the yoke 22 therefore acts substantially as a rotating contact but instead of transferring high tension electrical energy to the different sparking plugs, as occurs in distributors of the conventional type, it transfers magnetic energy into the cores of the: different secondary windings whose induced voltage is then transmitted to the sparking plugs.
  • the yoke 22 is therefore so shaped and dimensioned as to substantially cover the end of the core of the primary winding and that of the core of whichever secondary winding over which it is positioned.
  • an insulating mass which can consist of a suitable resin or of a fluid dielectric which conveniently fills the interior of the casing 20.
  • connection of the primary and secondary windings is made preferably, as shown in FIG. 1, through terminals, such as the terminal C shown connected to the primary winding 14, at the ends of the windings adjacent the yoke 17.
  • the secondary windings may, alternatively, be connected directly by cable to their respective sparking plugs; this has the advantage of eliminating insulating problems connected with high voltage; such problems are always present with conventional distributors.
  • the primary winding 14 is fed with electric current during ignition, when the rotating yoke 22 is in the desired magnetic coupling position between the core of the primary winding and the core of one of the secondary windings.
  • the supply circuit to the primary winding can be either of the traditional type, or electronic.
  • the primary winding can also be fed directly from the vehicles battery. In this case the rotating yoke would need to be suitably shaped in order to provide the requisite variations of the flow of current induced by its movement.
  • the magnetic cores for the primary and secondary windings are shown with a square shape but they could have a different shape; round for example. From the above it can be seen that the magnetic distributor described includes, in one single container, the distributor and the ignition coil. Finally, the distributor according to this invention is particularly suitable for electronic ignition systems since in this case, the bulk of the secondary windings is greatly reduced.
  • a magnetic ignition distributor for an internal combustion engine having a plurality of spark plugs comprising:
  • a yoke of magnetic material adapted to complete a magnetic circuit between said magnetic core of said primary winding and any one of said magnetic cores of said secondary windings, said yoke being rotatable about an axis of rotation which is coaxial with said magnetic core of said primary winding, and

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US82025A 1969-10-17 1970-10-19 Magnetic ignition distributor Expired - Lifetime US3683880A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT5372069 1969-10-17

Publications (1)

Publication Number Publication Date
US3683880A true US3683880A (en) 1972-08-15

Family

ID=11284772

Family Applications (1)

Application Number Title Priority Date Filing Date
US82025A Expired - Lifetime US3683880A (en) 1969-10-17 1970-10-19 Magnetic ignition distributor

Country Status (4)

Country Link
US (1) US3683880A (enExample)
JP (1) JPS4922986B1 (enExample)
DE (1) DE2050757B2 (enExample)
FR (1) FR2066001A5 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6328025B1 (en) * 2000-06-19 2001-12-11 Thomas C. Marrs Ignition coil with driver

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3741032A1 (de) * 1987-12-03 1989-06-15 Mitsubishi Electric Corp Hochspannungstransformator
JPH01196527A (ja) * 1988-01-30 1989-08-08 Esutetsuku:Kk リークテスト装置
DE202010015852U1 (de) * 2010-11-26 2012-02-27 Makita Corporation Motor für ein Motorarbeitsgerät mit einer verbesserten Anordnung einer Zündspule

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1377482A (en) * 1921-05-10 of stuttgart
US2918913A (en) * 1957-06-12 1959-12-29 Weselco Ltd Ignition systems of internal combustion engines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1377482A (en) * 1921-05-10 of stuttgart
US2918913A (en) * 1957-06-12 1959-12-29 Weselco Ltd Ignition systems of internal combustion engines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6328025B1 (en) * 2000-06-19 2001-12-11 Thomas C. Marrs Ignition coil with driver
WO2001098652A1 (en) * 2000-06-19 2001-12-27 Marrs Thomas C Ignition coil with driver

Also Published As

Publication number Publication date
DE2050757B2 (de) 1972-04-06
DE2050757A1 (de) 1971-04-29
JPS4922986B1 (enExample) 1974-06-12
FR2066001A5 (enExample) 1971-08-06

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