US3435264A - Magneto flywheel ignition - Google Patents

Magneto flywheel ignition Download PDF

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Publication number
US3435264A
US3435264A US569357A US3435264DA US3435264A US 3435264 A US3435264 A US 3435264A US 569357 A US569357 A US 569357A US 3435264D A US3435264D A US 3435264DA US 3435264 A US3435264 A US 3435264A
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US
United States
Prior art keywords
ignition
armature
magneto
interrupter
flywheel
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
US569357A
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English (en)
Inventor
Guenter Brand
Gustav Pfrommer
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3435264A publication Critical patent/US3435264A/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H02K21/222—Flywheel magnetos
    • H02K21/225—Flywheel magnetos having I-shaped, E-shaped or similarly shaped armature cores
    • 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
    • F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage

Definitions

  • the present invention relates to a magneto flywheel ignition for two-cycle combustion engines, and more specifically to a magneto flywheel ignition with a rotating four-pole symmetrically magnetized flywheel magneto and a'stationary armature plate on which an interrupter as well as an ignition armature and a light armature are mounted.
  • two-cycle combustion engines may rotate in one and in the reverse direction and may be prevented for rotating in the reverse direction, for instance, by a magneto ignition with asymmetrically magnetized flywheel magneto.
  • a magneto ignition with asymmetrically magnetized flywheel magneto.
  • the ignition armature only one change of magnetic flux during each rotation of the magneto flywheel, which induces the necessary voltage for the ignition.
  • the flywheel magneto is, however, provided with, for instance, four permanent magnets which, in view of the light current to be produced, are symmetrically magnetized so that four flux changes will occur in the armatures mounted on the armature plate during each revolution of the flywheel magnets which can be used for production of energy.
  • Two-cycle combustion engines of this type which operate with a pre-ignition of 30 tend to oscillate during start and to continue rotation in the wrong direction.
  • the ignition spark which initiates rotation of the engine in the reverse direction is produced in an interrupter with a closing angle of 230 by opening the primary current interrupter in a position which during rotation of the engine in the right direction is the closing position.
  • faulty ignition sparks are produced by a voltage induced in the ignition armature by the magneto flywheel when the primary current interrupter is open.
  • the flywheel magneto ignition mainly comprises a rotating four-pole symmetrically magnetized flywheel magneto, a stationary armature plate, an ignition armature and a light armature mounted on the stationary plate, a primary current interrupter mounted on the plate and connected in series with the ignition armature, and a rectifier connected in parallel to the aforementioned interrupter.
  • the rectifier is so connected as to short-circuit the primary winding of the ignition armature in one direction of current flow when the primary circuit interrupter is open to thereby prevent induction of a voltage in the secondary winding of the ignition armature which could 3,435,264 Patented Mar. 25, 1969 produce an ignition spark between the electrodes of the spark-plug.
  • the ignition voltage of the flywheel magneto ignition is reduced by the rectifier arranged parallel to the primary circuit interrupter when the engine rotates at high speed.
  • the arrangement preferably also includes a resistance connected in series with the rectifier.
  • FIG. 1 is a partially sectioned plan view of the flywheel magneto ignition according to the present invention
  • FIG. 2 is a wiring diagram of the ignition magneto according to the present invention.
  • FIG. 3 is a diagram showing ignition voltage curves with and without a resistance in series with the rectifier of the ignition in dependence on the speed of rotation of the engine.
  • the flywheel magneto ignition mainly comprises a rotating flywheel magneto 10 and a stationary armature plate 11 on which an ignition armature 12, a light armature 13 and a primary circuit interrupter 14 are mounted.
  • the flywheel magneto 10 comprises a potshaped steel housing 15 in which four radially magnetized oxide magnets 16 having pole shoes 17 are arranged angularly displaced through an angle of from each other and fastened to the peripheral wall of the housing 10' by screws as clearly shown in FIG. 1.
  • the magnets are magnetized in such a manner that the inner ends of adjacent magnets have respectively opposite polarities.
  • a cam 19 Fixedly connected to the drive shaft 18 of the rotating flywheel magneto is a cam 19 having a cam face cooperating with the primary current interrupter 14 and being constructed in such a manner that the interrupter 14 is in a circuit closing position during rotation of the shaft 14 through an angle of 230 C.
  • a lubricating felt 20 engages the cam face of the cam 19 to properly lubricate the same.
  • Connected to the secondary winding of the ignition armature 12 is an ignition cable 21 which leads to a spark-plug not shown in FIG. 1.
  • a conductor 22 connects the primary Winding of the ignition armature 12 to a condenser 23 mounted on the armature plate 11 and the condenser 23 is in turn connected by a conductor 24 with the interrupter 14.
  • a rectifier 25 preferably in the form of a silicon diode
  • the resistance 26 is preferably soldered to a pair of soldering taps 29 riveted to the frame 28 of the light armature 13, whereas the silicon diode 25 is provided with a serrated cylindrical projection 25a which is pressed in a corresponding opening formed in the armature plate 11 to properly secure the diode 25 to the armature plate and to connect the diode 25 at the same time to ground.
  • the secondary winding 31 of the ignition armature 12 is connected at one end thereof to one end of the primary winding 30 of the ignition armature, whereas the other end of the secondary winding is connected to the sparkplug 32.
  • the primary current interrupter 14 Connected in series with the aforementioned end of the primary winding 30 is the primary current interrupter 14, whereas the condenser 23 and the diode 25 with the resistance 26 connected in series thereto, are respectively connected in parallel to the interrupter 14.
  • the silicon diode 25 is so connected that during rotation of the combustion engine in the desired direction, as for instance indicated by the full line arrow in FIG.
  • the resistance 26 has to be dimensioned in such a way that, on the one hand, the ignition voltage during rotation of the engine at high speed will not drop too much, and that, on the other hand, the induced voltages during reverse rotation of the engine will be sufficiently dampened.
  • the dotted line of the diagram in FIG. 3 illustrates the ignition voltage curve in dependence on the revolutions per minute of the engine for a magneto ignition with a closing angle of 230 without resistance connected in series to the diode, whereas the full line of FIG. 3 illustrates this curve in such an arrangement in which a resistance of 13 ohms is connected in series with the diode.
  • the resistance provides an increase of the ignition voltage during high speed rotation of the engine.
  • An ignition system for a combustion engine comprising, in combination, a flywheel magneto including a stationary stator, a rotatable rotor and a flywheel secured to said rotatable rotor, said rotatable rotor and flywheel rotatable in a predetermined direction and rotatable also in opposite direction; electric terminals on said flywheel magneto; a transformer having a primary and a secondary winding, said primary winding being connected between said terminals of said flywheel magneto; a spark gap connected in series with said secondary winding; an interrupter connected in series with said primary winding; and current flow adjusting means connected in series with said primary winding and in parallel with said interrupter in such a manner as to be non-conductive when said flywheel is rotating in said predetermined direction so as to permit operation of said interrupter and to be conductive when said flywheel is rotating in said opposite direction so as to short circuit and thereby prevent operation of said interrupter, thus preventing creating a spark across said spark gap while said flywheel is rotating in said opposite direction.
  • said flywheel magneto includes a hollow cylindrical steel housing and four radially magnetized oxide magnets connected to and projecting radially inwardly from the inner periphery of said housing uniformly spaced from each other, adjacent magnets having respectfully opposite polarities at the radial inner ends.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US569357A 1965-08-13 1966-08-01 Magneto flywheel ignition Expired - Lifetime US3435264A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0083250 1965-08-13

Publications (1)

Publication Number Publication Date
US3435264A true US3435264A (en) 1969-03-25

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ID=6981867

Family Applications (1)

Application Number Title Priority Date Filing Date
US569357A Expired - Lifetime US3435264A (en) 1965-08-13 1966-08-01 Magneto flywheel ignition

Country Status (3)

Country Link
US (1) US3435264A (enrdf_load_stackoverflow)
DE (1) DE1488401A1 (enrdf_load_stackoverflow)
NL (1) NL6611389A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554179A (en) * 1969-06-19 1971-01-12 Phelon Co Inc Antireverse trigger for an ignition system
US3576183A (en) * 1969-10-31 1971-04-27 Kokusan Denki Co Ignition system for a two-cycle engine
US3612023A (en) * 1968-07-04 1971-10-12 Bosch Gmbh Robert Ignition arrangement for internal combustion engines
US3648675A (en) * 1969-07-16 1972-03-14 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3824976A (en) * 1972-08-30 1974-07-23 Kokusan Denki Co Capacitor charge-discharge type ignition system for use in a two-cycle internal combustion engine
US3894525A (en) * 1973-03-23 1975-07-15 Bosch Gmbh Robert Transistorized magneto ignition system for internal combustion engines
US3903863A (en) * 1972-12-29 1975-09-09 Kokusan Denki Co Signal source in use for a breakerless ignition system for an internal combustion engine
US4024844A (en) * 1973-04-28 1977-05-24 Nippondenso Co., Ltd. Ignition device for an internal combustion engine with cam design for preventing undesired firings
US4203403A (en) * 1973-04-28 1980-05-20 Nippondenso Co., Ltd. Ignition device for an internal combustion engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR701583A (fr) * 1929-12-07 1931-03-18 Dispositif perfectionné pour l'allumage et l'éclairage de motocyclettes et autres véhicules automobiles
DE883673C (de) * 1950-12-22 1953-07-20 Noris Zuend Licht Ag Schaltung fuer die Stromanlage von Motorfahrzeugen
US2688101A (en) * 1950-08-08 1954-08-31 Noris Zund A G Ignition-lighting generator
US2790914A (en) * 1954-09-28 1957-04-30 Bendix Aviat Corp Electrical apparatus for ignition and lighting
US3037148A (en) * 1962-05-29 Ignition systems for internal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037148A (en) * 1962-05-29 Ignition systems for internal
FR701583A (fr) * 1929-12-07 1931-03-18 Dispositif perfectionné pour l'allumage et l'éclairage de motocyclettes et autres véhicules automobiles
US2688101A (en) * 1950-08-08 1954-08-31 Noris Zund A G Ignition-lighting generator
DE883673C (de) * 1950-12-22 1953-07-20 Noris Zuend Licht Ag Schaltung fuer die Stromanlage von Motorfahrzeugen
US2790914A (en) * 1954-09-28 1957-04-30 Bendix Aviat Corp Electrical apparatus for ignition and lighting

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3612023A (en) * 1968-07-04 1971-10-12 Bosch Gmbh Robert Ignition arrangement for internal combustion engines
US3554179A (en) * 1969-06-19 1971-01-12 Phelon Co Inc Antireverse trigger for an ignition system
US3648675A (en) * 1969-07-16 1972-03-14 Bosch Gmbh Robert Ignition arrangements for internal combustion engines
US3576183A (en) * 1969-10-31 1971-04-27 Kokusan Denki Co Ignition system for a two-cycle engine
US3824976A (en) * 1972-08-30 1974-07-23 Kokusan Denki Co Capacitor charge-discharge type ignition system for use in a two-cycle internal combustion engine
US3903863A (en) * 1972-12-29 1975-09-09 Kokusan Denki Co Signal source in use for a breakerless ignition system for an internal combustion engine
US3894525A (en) * 1973-03-23 1975-07-15 Bosch Gmbh Robert Transistorized magneto ignition system for internal combustion engines
US4024844A (en) * 1973-04-28 1977-05-24 Nippondenso Co., Ltd. Ignition device for an internal combustion engine with cam design for preventing undesired firings
US4203403A (en) * 1973-04-28 1980-05-20 Nippondenso Co., Ltd. Ignition device for an internal combustion engine

Also Published As

Publication number Publication date
NL6611389A (enrdf_load_stackoverflow) 1967-02-14
DE1488401A1 (de) 1969-04-10

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