US1616939A - Ignition apparatus for internal-combustion engines - Google Patents

Description

BEST AVAILABLE co 4 1,616,939 F 1927' L. M. WOOLSON IGNITION APPARATUS FUR INTERNAL COMBUSTION ENGINES Filed May 4, 1925 INVENTOR:

Lionel MWOQZsQL A TTORNE Y.

- qdou leiignition system. 5 I adapted "to supply area; 16 ignition s s em,

parts is avoided,

i magnetogfii gtgi i mordance-with the' BESTAVA UNITED STATES PATENT Q-FF-ICBQ ixoivnn in. woo'nson; or DETROIT, MICHIGAN, ASSIGNOR 'ro 'mcmnn iuoroacan --comrm, or DETROIT, MICHIGAN, a CORPORATION oF'nIcnIoAN. p

f I??? Q mmmsnr m ron i'ivrnaneri-comnusrion enemas. I "fg ini tmii 'fiieaua 4,1921 Seria1 No. sea 571p 7 5 This invention relates toignition appa ratus' for internal combustionengines, particularly of thetype employed in the ropul V sion of aircraft, and it contemplates t e ro- 6 vision of a double ignition: stem which s, all

sturdy-- and'reliable, an inwhich a material saving. ofuweightjs'hail lieiefiectedi J? fOne-object of theinvention istoprovide call distinct sou rces sto'eac ranch -of a Another; object to rovide li-lmgiiao in. which the unnecessary uplication. of

I a Other. objects and ofthe} an inwhich'z' I Fig-.1 1 is a sellematicrepresentatlon of a' inventiomysheiifisiadifited to; supply the i ignition systeni of 'cornla'iistion 'engm' e I.Fig;'2'is'a d1a i I 'circults of a device similar'to thatshown m a six; -cylinder internal ig." 1, but applicahleto a four cylinder en; 3o gine; and" v1 I Fig. 3 is al diagram similar to Fig. 2;;

showings. diflerent-form of the inventiom "r The principal requirement for the ignition system of amairplane" engine is reliability, in the furtherance of which many aircraft the duphcation ofpartsg-Many'of the ele ments ;,ofa,- magneto aregsufiiciently sturdy to bej'practically indestructible, and failures rarely"occu r in the ."rotor, oam, magnets, or

' 1 drive of oneofthese machines. On the other hand, the windings, contact breakers, condensers, etc.,' are of necessity delicate, and

- should he duphcated.

,ljinvention will appear from the following def. V scription'taken' 1n=connect1onwith the draw- I, 20 which iormsapart of the SPQ C1 fi t10H,

saw-a maae iei;

engines are equipped with double ignition; By a. double ignition system is meant a system having duplicate sets of ignitionappai In this I XVith these considerations 'in mind, this invention provides, a'fma'gneto adapted to supply the double ignition system of 'anin Referring to' the drawing,- in- Fig. 1 is illustrated an internal combustion engine 10,

haviiplgxa cylinder portion 11 mounted on a or case portion 12, and. having a head portion :13 provided with s'park='plugs 14',' 1 which-are. adapted to ignite the fuel 1n the 1 engjmei ylinder in the well'known manner. It 'isto, be understood that the engine, in

7o; ition system,

the embodiment of the inventionillustrated, is .provided with a double i I and as shown in Fig. ;1, eac cylinder has the two pl 1'g;in any given-cylinder is connectedtof 'ai' separate source of electrical energy, in .a manner Well understood in the art to which the invention relates.

We of the spark plugs 'l', so that each of At 16 is representedv magneto of the well I known inductor type,"- having a e poles oi tensions 13 and" 21.

arranged 9O degrees apart, the, opposite wings being of the same polarity. The rotor air of permanent magnetsll'i', 'between th which is arranged afield structure including ""a lan'iinated core 18 rovided with pole exetween imd below the poles 19 and 21 is mounted a rotor 22havmg four wings or extensions 23, which arecarries the extensions 23 past the poles and 21 in ra id. succession causing a rapid the core 18 in a Well known manner. a

The laminated core 18 is provided with a plurality. of primary 'windin 24; and secondary windings 26, arrange in sets, which sets constitute. separateclectrical circuits, and it will be evident tl1at ,the magnetiecirreversal of ow of magnetic flux through cuit formed by the core 18,;the pole pieces l9 and: 21, and-tl1e-rotor"22, is common to all bf these electrical circuits. Each of theprimary windings 24 is provided with a'suitlsists of a pair-of contacts 27 and 28, the contact, 28: being mounted on the end of a pivot ablegcircuitbreaker mechanism which con- AVNLABLE COP:

series with a switch 32 to a ground connection 33, as will be readily. seen; In practice the switches 32' are incorporated in-a' single structure, of well known type, having ofi andon positions for each branch of the system, and for both branches together.

The other end of the primary winding 24 I is connected at a common ground to the secondary winding 26, whic is mounted on the core 18 in inductive relation to the primar-y winding 24. The other end of the secondary winding 26 is connected to .the centra-l contact 34 of the distributer 36, having a number. of contacts 37arranged for coactionwith a rotatable arm 3 8, driven in timed relation to the engine in any convenient manner as is well understood. The

- contacts 37. are connected to the engine spark 20. of the contacts 37 of each of the distributers .plugs 14 in the order in which the engine cylinders are arranged to fire. Each one 36 is connected to .one spark plug 14 in each i of the enginecylinders, in the well known onsl usein connection with a four cylinderengine, as is well known. y

It will be'iohservedthat the switch 32 is in series with the contacts 27 and 28 in the primary circuit 21- s0r'that' with this switch open, the'circuit 24 is open, and the magmm is rendered inoperative, In this way,

i only a single wire-fromeachof the breakers 29 to the switch '32 is needed, the primary circuit being completed to ground through thisswitch. a

In the operation of the device, if one. of thesets of coils-is open-circuited, either intentionally or accidentally, there is a marked increase in the output of the other coil set caused by the decrease in choking effect exerted-'by' the coil wh'h is. open circuited. Thus in cas of acc dent to one of the branches of the system it is only necessary to 'open the circuit of this branch, at the switch 32, to intensify the action of the re maining branch, thus promoting the rehability of the device.

If one of the coil sets is short-circuited, its choking effect is increased and consequently the output of the other coil is dey creased somewhat, but not sufiiciently to interfere with'the operation of the engine.

- In Fig. 3 is shown another formof the invention, .adapted for. single ignition, in

Y which the terminals 37 of the single distributer 36 are-eachconnected to one spark plug in each of the engine'cylindcrs. In this apparatus the magneto-161k provided with a primary winding 24:, but has only one ofthe secondary windings 26, which is connected to the distributerarm .38 in the usual manner. The other primary winding 24 may be used to supply low tension current to independent electrical cir cuits, a lamp 38 and a resis tance 39 being illustrated by way of example. Y

-It will be evident that by this invention is provided a'structure-in which the magnets,

pole pieces and rotor of the single machine are common to the two independent sets of coils and their associated parts. By this construction, a single magnetic- .circuit is made common to a plurality of electrical circuits, so that duplication of the relatively heavy parts associated with the magnetic circuit, isavoided. .At the same time, the

4 electrical circuits are totally separate and distinct, so that trouble originating in either one will not aiiect the operation of the other to any extent.

It will be understood that various form In this way the reliability of the apparatus is enhanced.

of the invention otherthan those described above may be used without departing from I the spirit or scope of the invention.

What is claimed is: 1. The combination with an internal coinbustion engine, of a magneto havlng a single magnetic circuit and a-plurality of electrical circuits arranged in inductively associated sets, one ofsaid electrical circuits including the ignition system of the engine.

2. The combination with an internal combustion engine, of a magneto having a pluralit of electrical circuits each including win ings in transformer re1ation,'of a Single magnetic circuit common. to all the windin s, and means connectin at least one of t e windings -to the'ignition system of the engine.

The combination with an internal combustion engine, of a magneto having a plurality of electricalcircuits each including a primary and secondarywinding, a single magnetic circuit for all of the windings, and

means'connecting the secondary windings to the ignition system of the engine.

4. The combination with an internal combustion engine having spark plugs, of a magneto having a plurality of electrical circuits each including inductively associated windmgs, a single magnetic circuit for all of the windings, and means adapted to distribute current from at least one of the windings to the spark plugs.

5. The combination with an internal combustion engine having an ignition system, of a magneto having electrical circuits including a plurality of primary windings, a magnetic circuit common to all of the electricalcircuits, and means associated with at least one of'the electrical circuits to supply current to said ignition system.

6. The combination with an internal co'm- BESTAVNLABLE COP;

mary and secondary windings, a" magnetic circuit common to said electrical circuits, separate means adapted to break the circuit in each of the primary windings in timed relation to the engine, and a switch in series with each of said breaker-means adapted to complete the circuit through the last named winding.

7, The combinationwith an internal combustion engine having an ignition system, of a magneto havinga plurality of electrical circuits each including inductively associated sets of windings, and a single magnetic circuit common to all of the windings, separate means adapted to' break the circuits in some of the windings of each set in timed re latio'nto the engine a switch in series with each of said breaker means, and means adapted to distribute current from other of said windings to the ignition system of the engine.

. 8. A magneto having a plurality ar -i "j mary and secondary windings forming elec trically independent circuits, ground connections for the primary windings, and switch means in serieswith the primaryavindings and the ground connections adapted to complete or open the circuit therethrough.

9,'In combination in a magneto, a plurality of sets of windings associated in inductive relation, circuit breaking means in a series with one of the windings of each set, a'condenser arranged to shunt each of said circuit breaking means and a single magnetic circuit common to all of said windings.

10. The combination in ignition'apparatus for internal combustion engines having a plurality of spark plugs in each cylinder thereof,'of a magneto having pairs of windings inductively associated in sets in transformer relation, a s paratecircuit breaker for one of the windings of each set operable in timed'relation to the engine, a'separate condenser arranged to shunt each circuit breaker, a separate distributing means associated with the other windings of each set.

adapted to distribute current from said windings to one of the spark plugs of each cylinder, and single means to produce a magnetic field common to all said windings.

ture;

LIONEL, M. WOOLSON.

In testimony whereof Iv afiix my signa-

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