US1995917A - ig ignition apparatus - Google Patents

Description

showing a form of the present; invention.

i ,tion withthe engine crankcase.

Patented Mar. 26,v 1935 i i idNi'rioN ArrAaA-Tns 'I KA"Charles Hall Davis, Jr., Andersomilnd., assigner, by mesne assignments, to` General Motors Corlporation,lDetrciig Mich., a corporation ofDelaware f,

f Appiicatienrune [26, iesnseriai No.; Massi .3 creams.4 (chiss-14st 'f This invention relates toignition apparatus 'for internal combustion engines, and one of theolo- 'ects` is .to provide. Vignition "apparatus requiring less frequentv renewal of spark plugs. A further object ofv the present,` invention'isftoprovide certain improvements inignitiozi apparatus for relative high speed Ainternal, combustion` engines. These objects are accomplishediinfthedisclosed forms of the inventionby the-.use of `a plurality of ignitionV coils which` are alternately charged and ydischarged;througlithe y'operation of. timed circuit breakers operated by afcamdriven. at onehal'f engine speed for a twov cycle engine, or onefourth; engine speedfor ,ay lfour cyclerengin'e so that a series of sparking impulses are produced vbyy y alternately cdisch-arging vthe ignition. coils. These impulses are distributed to; the various spark plugs ofthe engine `through-ar pluralityl of distributing 4circuits, which f are alternately.r operati-veto etect distribution. ,Inthe disclosed form of the'inventionthelengine cylindersaare provided eachwith two spark plugs sothat the engine may.-

bensaid to have two series of,4 spark plugs. The distributing of `the' sparking impulsesis such that,

during onecycle of engine operation, ori-@series engine the other series operates. In other words the spark plugs are used in two alternately operating series to fire the engine.

Further objects andadvantages of Athe present invention will be apparent fromthe following description, reference ybeing had to the accompanying drawing wherein a preferred embodiment` of one form of the present invention is clearly shown. yIn the drawing: .y Y The iigureof the'drawing'A isa wiringdiagram I Referring to the drawing, various engine cylinders designated by I to ,VIy respectivelyare arranged in rin'gvorder in the drawing but not necessarily in the lorder of mechanical connec- Each cylinder is provided with two sparkl plugs, for example,

#I'is provided with sparkr plugs lasand 1b. The various spark plugs are connected with distributor inserts or terminal posts 21,. For example, spark plug 1a is connected with post 21#1a, and

spark plug 1b is connected with terminal post.

21#1b, these posts being diarnetrically'opposite.

The other spark plugs are connected ina similar' thereto. rotates clockwise is in such position that ther engine and carryingjtwo yinsulated Adistributing arrnsf23 and 24 whichvare atall timeslin Contact fietser? with. stationary distributorv terminals 25 land. 26 respectively, thcilattervbeing inftheiorni oiga n ring. The members 25 andA 26 alternately receive sparkingzimpulsesfrom ignition coils 30 and 46 having.seccndariesY 31and `4lrespectufely conf f nected with-members 25.and 26 and having` pri,v

maries '32 and'42 connectedl respectivelywith terrespectively vpvoted at'35a`and45a and-carrying q contacts 36 andk 46 engageablet respectively withf grounded contacts 37 and A47. The `pair Aof contactsf36 -37 is shunted-by.ajcondenser 38and the pair `of 'contacts 46,V 47 is shunted by a condenser' 48..` The flevers 3 5 and -45 carry respectively rubbine' blocks f .3 9. and 49. Weicher@ engaged' by a;

cam 50 carried by the engine drivenlshaftg22; 'Ihejprimary coils'32 and 42fare-connected tby a` switch 51'y with -a battery 52 l groundedlyat 5,3;

, The cam `5i) rotates at one-half engine].speedl for atwo cycle .engine or ations-fourth enginel speed. yfor a fourcycle engine toefiectthegalternate: closingfandopening ci .thc-pairs o f.ftirneri contacts to effect the valternate charging. andl discharging of the coilsand 40. During each '7.

revolution of the shaftof a two cycle engine or 'Y each two revolutions of a four cycle enginefthc cam 50 makes a half turn and each coil will be 'discharged three times making a total of six sparking impulses. During one revolution of the shaft vof a two cycle engine or each two revolutions of al four cycle engine,the series of engine yplugs 111v 2a., 3a, 4a, 5a and 6a lwill provide "the gaps' 'for' the Vjump of the sparking impulses delivered It will be noted that the cam 50 which contacts 36 and' 37 have just separated. Therefore a sparking impulse will have been generated'. in the coil 36 and delivered from the secondary" l thereof to the central contact 25, thence through the distributing segment'23 to post 21,#111l and then to spark plug la of cylinder 20,#1. During the following increments each of one-twelfth revolution of the distributor segments 23,r 24 in a clockwise' direction, the coil 40v will be discharged and the sparking impulseA therefrom will be conducted through contact ring. 26 andl segment 24 to distributor post 2a,V and then. to spark plug 2a `of engine cylinder 20#II.

distributes a sparking impulse from the coil `to post 21#4a, then segment 23 distributes a' sparking impulse from coil 30 to post 31#5a and then segment 24 distributes asparking impulse from` coil 40 to post 211ffr6a V Thus it is apparent that the series of plugs, v1a, 2a, 3a, 4a, 5a, an'da "receive sparking impulses from alternatelydischarged ignition coils v30 and 40 during one revolution `of the engine shaft fora two cycle engine or during two revolutions vof the shaft yof a four cycle engine.- During the -following revolue tion of the shaft of a two cycle engineer during 'the following two revolutions of the sh'aftfof va four cycle engine, .the series ofvspark plugsv 1b, 212,317, 4b, 5b, and 6b receive-,the next six'sparking impulses produced by the alternately dis-f' charged coils 30 and* 40; It will be apparent that during this next rotation` of the `engine shaft, -v

segment 23 will conduct, a i sparking impulse vfrom Couso to post 21#1`b, thensegmentV 2.4 winconduct a sparking impulse from coil 40 to postr 12,1#211 Then segment'23 Vwill 'conductl a sparking impulse `from coil 30. to post 21#.3b,thenfseg ment 24 `will conduct a sparking impulse from coil 40 to post 21#4b. Next,segm'ent 23 will 'conduct` f ABy providing coils alternately discharged through the agency -ofl alternately operated circuit breakers operated' each by `a cam rotating ignition apparatus since two Sets of alternatevat one-halfengine speed for atwo cycle engine por at one-fourth engine 'speed for a four cycle engine, it is apparent-that satisfactory Vignition can be provided for either a two cycle ora four cycle internalv combustion engine v"o'pe rza,ted' at relative high speed. d 'f A further advantage is that the spark plugs will lastlonger than in conventional forms of ly operated spark plugs are provided. f

While the form of embodiment of the present vinvention as hereindisclosed constitutesv a pre-- ferred form, it is to bev understood thatother Vforms, might be adopted, all coming within the` scope of the-claims which follow.

What is claimed is as follows:

1. Ignition apparatus for an internal combustion engine comprising, in combination means for` generating a i seriesr of.sparking impulses,

sparking devices-With theengine cylinders, `each f cylinder having a vpluralityof insulated sparking" device terminals thus providing` thejcylinders,u 'l collectively, with a plurality'oi' series of ,insulated sparking `device terminals,` and means for distributing sparking impulses to one series of spark- `ing device'terminals during one cycle of `enginel l' l operation, andv toA another series during Va followingcycle'. I Y, l 4, Y

2'. Ignition apparatus for an internal combustion engine comprising,` in combination, means for generating a series of vsparking impulses] spark-- ing `.devices with the engine. cylinders, each cylin- 'der having axplurality of 'spark'plugs each'of` which has one insulated'terminal thus providing the cylinders, collectively, with fa plurality of seriesj of 'insulated spark plug'V terminals, and

means' for distributing sparking impulses to lone series of sparking plug terminals duringvone-cycle of engine operation and to' another series'during a following cycle.. i" f 1 '1 3. Ignition apparatus forian internal combustion engine having N" cylinders comprising, in combinatiom sparking devices forlthe cylinders' each cylinder `having two insulated sparkingdevice terminals,A rneansfor generating vsparkingk impulsesand comprising two' ignition coils, two, y

circuit interrupters respectively, for controllng the coils, a cam having Nlobes foroperatingthe interrupters alternately,v said cam ,being Adriven at one-half engine "speed for a. two-cycle engine oi at one-fourth engine speed for a'fourcyelel engine, andmeans for distributing thesparking impulsesv and cfmiprising two distributing segments'rotating at interrupter lcam speed and ai g head having a circular row cnf-2N posts connected respectively with the insulated sparking device`

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