US1461128A - Magneto ignition device - Google Patents

Description

1919 2 Sheets-Sheet' 1 /1 TTOH/VEY J. K. LEIBING MAGNETO IGNITION DEVICE Filed July 2l July 10, 1923.

July 10,1923. l 1,461,128

J. K. LEIBING MAGNETO IGNITION DEVICE Filed July 2l 1919 2 Sheets-Sheet 2 .027 HMP. .D C.

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A NOR/vf y Pueaaa July v1o, 1923.

. UNiTEn STATES rosari: n.' LETnING. or NEWARK, NEW JERSEY, assrenon To varnrrnomj ELECTRICAL.

PATENT 'COMPANY, 0F NEWARK, NEW JERSEY.

MAGNET() IGNITION DEVICE.

To all 'whom tmay concern:

Be it known'that I, Josnrn K. LEIBING, a citizen "ofthe United States, residing at Newark, in. the county 4of Essex and State ofl 'New Jersey, vhave invented certain new and useful Improvements in a Magneto Ignition Device, of which the following is a specification. f

'This invention relates to ign1t1on apparatus in which the movable element is moved so as to control or shift the `direction of the fiux Without continuous rotation of the movable element. In the preferred ,form illustrated in the drawings attached hereto, the

movable element is oscillated or rocked to produce the ux: changes and the generation of the nignition spark. It has been the common ra'ctice heretofore in ignition generators o this type,com

monly referred `toas oscillators, to maintain the'circuit breaker 'controlling the ignition cil in a .closed position during both the s etting :and working stroke up to the polnt where the circuit breaker opens to produce the maximum spark timed in relation to the firing stroke of the engine. As will be hereinafterpointed out by the diagrams and curves,` the movement of the movable elementk from. its normal stationary position tor-what .issometimesx referred to as the cocked or working position, will generate a flow of current in theeoil winding which acts 4vto choke "back-the flux through the coil and then 'atthe higher speeds is not given sutil- -`cient time for the fluxto reverse and build up v'current `through the coil in the direction lto roduce a proper spark. Heretoore this i dilibulty has-been overcome to some extent by making the ignition machine large and providing it with a very powerful magnetic field so the spark produced will still be great enough to` tire an engine under ordinary "c'onditions, 1 y

It isithe object o'my invention to provide an. ignitioni generator-.gin -which this diiiiculty is;V overcome, that .isf to l say one; in which the flux/is so vcontrolledlaste produce avery hot y spar-kun'der-.fall"conditions of operation and atfthe." same time ,resulting il!! a machlne nmchjsimpler, lighten-.and- 4less' expensive than! those used"I heretofore; A -Qtherand further objects-will be apparent 1.'- toone skilledinthe art aftera study ofV the specification taken in connection with the annexed drawings, wherein- F igure 1 illustrates diagrammatically the application of my invention to an ignition generator of the inductor type.

Figure 2 is a view similar to Figure 1 but with the eration.

Figure 3 shows a circuit breaker and cam in dii'erent position from that shown in Figures 1 and 2.

Figure 4 is a View similar to Figure 3 but with the parts in a different position.

Figure 5 is a perspective view of the circuit breaker used in connection with my invention.

Figure 6 is a view ofone portion of the cam shown in the previous figures.

`Figure 7 is a view of another portion o the cam.

Figure 8 is a washer used to hold the two potions shown in Figures 6 and 7 together an Figure 9 is a screw used for holding the cam in position on the operating shaft.

Figure 10 is a resilient member connected between the cam portions shown in Figures 6 and 7.

Figure 11 is a copy of an oscillograph record taken from a given type of an ignition generator under a certain condition.

Figure 12 is a similar record of the same ignition generator under another condition, while Figure 13 shows another condition of operation of the same machine.

Figure 14 is the same machine operated in the same condition as shown in Figure 1, but having my invention applied thereto.

Figure 15 is the same machine with my.

invention applied thereto under another set of conditions, and

Figures 16 and 17 illustrate the same ma-v chine under still other conditions.

Referring now to the details, wherein like- 'andV a high tension winding 5. A spark gap 6 illustrating a plug in an engine cylinder is -connected in circuit with the-high tension n oFFicE.

parts in a different position of op.

winding 5. The breaker box b7 for attachment to one end of the ignition generator carries a stationary insulated block 8 carry- Xllllllllll Zilli!! ll lllllll! lng ah member 10 carries a contact 11 adapted to cooperate with contact 9: Member 10 1s preferably grounded as indicated'. Between the field poles 1 and 2 an inductor having lobes 12 and 13 is adapted to operate. This type of inductor and its manner of distributing the ilux through the lield poles 1 and 2 and core 3 is illustrative of the well known Dixie ty e of ignition nerator and since it is well i lustrated and escribed in Patent No. 1,081,760, issued December 16, 1913, to C. T. Mason, it will not be further described herein except in connection with my arran ment of control of the flux through the wor ing coil. Attached to one end of the operating shaft is a lever 1 4 which 1s held in a normal stationar posltion by sprmgs 15 and 16, all in a wel known manner. The .lever 14 is adapted to be operated b a movable memberl 17 driven by the engine. On the other end of the operating shaft is mounted a cam consisting of two portions, one portion shown in Fi re 7 having a cam 1.8 with sleeve 19 loose y mounted on the shaft and held thereto by means of a. pin extending through the slot 20, one end of the pin is adapted to engage the eyelet 21of spring 22, the opposite end 23 of the spring is ada ted to enter a hole 24 in cam 18. The end o the operating shaft is reduced to receive a second portion 25 of the cam shown in Figure 6. This cam portion has a short hub 26 which extends within the opening 27 of the cam portion 18. A keyway 28 adapted to receive akey which is used in conjunction with the washer 29 and screw 3 0 to fasten cam portion 25 to the end of the operating shaft. The cam portion 18 has a notch 31 f which is adapted to be engaged by a metallic bumper 32 carried adjacent the fiber bumper 33 on the breaker arm 10. The metallic bumper 32 is preferably of steel and hardened so as to reduce the wear thereon.

Coming now to the operation of my device and assuming the parts to be in the normal or stationary position shown in Figure 1, it will be noted that the circuit breaker points 9 and 11 are heldopen by both portions 18 and 25 of the cam engaging the bumpers 32 and 33. As the movable element is moved by the member 17 acting to the right aga-inst lever 14, it is seen that the rotor lobes 12 and 13 which in normal position direct the magnetic ilux through the coils 4 and 5 in the direction of the arrow shown in Figure 1, will produce a: rate of change in this flux tending to set up-a eurrent in the primary winding4, but this is prevented since the circuit contacts 9' and 11 are held apart. Further movement of the lever 14 to the right carries the cam 25 to the position ,shown in Figure 3 but the cam 18 acting on the bumper 32 still holds t ship with poles 2 and 1 respectively; that is to say, t0 a position in which the ux is reversed through the Iprimary coil 4 as indicated in Figure 2. irectly after this llux reversal has taken place, the cam 18 moves to a point where the bumper 32 dro into the notch 31 allowin the circuit reaker contacts 9 and 11 to ose, but since the flux throu h the primary coil has already built up, w ile the contacts 9 and 11 are o n to substantially its maximum value re y for the return or working im ulse, little or no current is generated and ence no choking eiect is produced during the setting interval. Continued movement of the member 17 carries the lever 14 with the movable element to its full working position as shown in Figure 2 and as soon as the member 17 passes from engagement with the lever 14, the lever 14 together with the movable element is quickly restored to normal position due to the energy stored in the spring 15. At this time the cam portions 18 and 25 are in the position shown in Fi re 2, but due to the engagement ofthe umper 32 engaging the notch 31 of cam-18 this portion of the cam is held, from rotation until the rotating element has reached the position of generating a maximum spark at which time the cam 25 reaches the position shown in Figure 4, wherein it engages the bumper 33 to open the contacts breakin through the primary coil 4 w ich in turn acts on the secondary 5 to produce a spark in the usual manner. As soon as the breaker arm 10 has been moved to open the contacts, as just explained, sprin 22 acts to return the cam 25 to its norma position shown in Figure 1, ready for the next cycle of operation. From what has been said it will be readily understood that the choking action present in ignition generators. where the ordinary cam is used is eliminated and a hot spark is produced at various periods `of oscillation or movement of the movable element under various conditions of operation.

To illustrate more graphically the advantages of my invention, reference will be had to the curves illustrated in Figures 11 to 17 inclusive. Each of these figures are reproductions of oscillograph records taken from the same machine but inaccordanoe with the notations marked on the curvesassociated with the diierent figure numbers. In each of the illustrations thecurves marked T illustrate sections of a time interthe circuit lio val curve automaticallyplaoed on the record i ures 11, 12 and 13, the operation of a certain ignition generator with an ordinar cam 1s depicted, While Figures 14 to 16 inclusive illustrate the same ignition generator with my invention applied thereto; that is, one equipped with a cam as herelnbefore described. An ignition generator equlpped with the regular cam would give no spark at vall in a test gauge in which the pressure Was 125 'pounds per square inch but the same generator When equipped with my improved cam gave sparks under this condition as illustrated in Figures 16 and 17. From these curves it Will be clear how my invention has improved the sparking ability of this articular ignition generator.

W ile I have shown the application of my invention to one form of ignition generator, it shall be understood that it may be used with other forms of ignition generators,such as the so-called shuttle type. It Will be further apparent that numerous changes and alterations may be made in the details for carrying out my invention and I therefore do not Wish to be limited to the exact form shown and described herein. Since the primary coil controls the .functioning of the secondary coil, I have referred to the primary as the coil for producing the spark and therefore do not W1sh to be limited to a construction which includes both primary and secondary coils as one coil onlv may be used and this connected to a Wipe spark contact in the engine.

Havingthus described my invention, what 1. In a device of the character described, a coil for producing a spark, means for energizing said coil including a magnetic field and a movable element aving a normal stationary position for directing magnetic fiux through said field and coil, means for moving said movable element from said normal position to a Working position, means `for preventing said coil from interfering4 with the movement of the magnetic flux during a considerable part of the movement of the movable element from normal to Working position, means for utilizing the magnetic flux put into operation as the movable element reaches the Working position and means for completing from the Working osition the Working stroke of said mova le member for the purpose described.

2. In a device of the character described, a coil for producing a spark, means for energizing said coil including a magnetic field and a movable element having a normal stationary position for directing magnetic flux through said lield and coil, means for moving said movable element from said normal osition to a working position, a circuit reaker for controlling the Working of said coil. a cam acting on said circuit breaker to hold said coil Winding open to. prevent generation of current therein during the early portion of the movement of the movable ele. ment from normal to Working position, means for quickly completing the Working stroke of the movable element and a cam for acting on the circuit breaker' near the end of the working stroke for the purpose described.

3. In a device of the character described, a coil for producing a spark, means for energizing said coil including a magnetic field and a movable element having a normal stationary position for directing magnetic flux through said field and coil, means for moving said movable element from said normal position to a Working position, a circuit breaker for controlling the Working of said coil, a two part cam, one part acting in conjunction With said circuit breaker to hold said coil Winding open to prevent generation of current therein during a considerable part of the movement of said movable member from normal Working position, the other part of said cam acting on the circuit breaker at the proper time to produce a spark from said coil on the Working stroke of said movable member and means for producing a quick Working stroke of the movable member.

4. In a device of the character described, a coil for producing a spark, means for energizing said coil including a magnetic field and a movable element having a normal stationary position for directing magnetic flux through said field and coil, means for moving said movable element from said normal position to a working position, a circuit breaker .having a movable member for controlling the Working of said coil, said movable member having a two section bumper, a cam having one part acting on one section of the bumper to hold the movable member of the circuit breaker in open position for a longer period than the other part of the cam acting on the other section of the bumper, whereby maximum energy may be stored in said coil and discharged on the Working stroke of the movable element by the action of the second mentioned part of the cam acting on the second mentioned section of the bumper.

5. In an oscillating ignition generator having a sparking coil and a rotatable element having a drive shaft for producing changes of i'lux through said coil, an interrupter in circuit with said coil, a cam for operating the interrupter at the time when maximum energy is stored in said coil by the rotating element in its working stroke, and an auxiliary cam acting on said interrupter to hold said coil circuit open during the initial flux changes produced by the rotatable element in being moved to a position for its Working stroke.

ment havin a ive shaf t.ifoi.-- producing changes ofluxthrough said coil,an-interhaving; a sparkin. coil andi afrota'table elerupter in circuitfwith said coil",` two interrupte'r cams operated by theshaft ofsaidrotatable element, one cam being 4fastened directly 'to said shaft' and moving* in; synchronism therewith and actin terrupter'atthe time when maximum energy is stored in said .coil by said rotatable e ement in its working stroke and means for re and acting onsaid interrupter at the time y when maximum energy is stored in said coil by said rotatable element in its working stroke, means for retarding the initial rotative movement of the other cam through a predetermined anglewhereby said interrupte'r is held open until said rotatable element has moved a predetermined distance for the purpose described and means for restoring said second cam to normal osition during the working stroke of sai' rotatable element.

8. The method of producing sparking current from a coil associated with a eld carrying magnetic flux and with means for shifting the direction of the flux through the coil, which consists in shifting the direction of the flux and during substantially all of said shift, acting on said coil to prevent any action of the coil on said flux, then again shifting the direction of said flux and again acting on said coil at the instant of the maximum rate of change of fluxto produce the sparking current.

9. The method of producing sparkin current from a coil associated with a fiel carrying magnetic flux and with means for changing the amount of `flux through `the coil, which consists in producing an initial change of flux through said coil and coincident therewith acting on said coil to allow said initial ilux change to take 'l'ae'e freely and without eect on the coil, t en producing another change of the fluit through said coil andutilizing in the coil the ma'or p ortion of said change of flux to pro uce the sparking current.

210. In combination with -a high tension'I magneto of the oscillating. type, 'of 'interon said' iii-- wherein a-current is created in the magneto rupter mechanism' .controlling `the circuiti ofthe primary winding, said interrupter mech mism-'arranged to insure that'the circuit of the primary winding is open during themajonportion of themovementof the rotor inf one direction, closed at the end 'of such such last movement, seriatim.

.11. An oscillating ignition equipment consisting in combination fwith a magneto comprisiiig a rotor, stator, and neratin windings, spring means norma ly holding the rotor in a certain position with respect to the stator, a trip device operably connected with the rotor arranged to be en aged by an engine driven actuator, move against the tension of said spring means and released, together with means arranged to insure that thecircuit includin the generating winding is open before t e trip device is released as aforesaid and closed during the whole of the recoil of the rotor under the tension ofsaid spring means.

12. An ignition magneto of the type generating winding b the recoil o the magneto rotor under t e tension of spring means after the latter has been cocked against the tension of the said spring means and released, in combination with means arranged to insure that the circuit of the generating winding is open before the rotor recoils under the tension of its associated spring means as aforesaid and closed before t e recoil movement begins.

13. A n ignition magneto of the type wherein the current used for ignition purposes is created in the magneto generating 'winding by the recoil of the magneto rotor under the tension of spring means after the latter has been cocked against the tension of the spring means and released, in combinat-ion with an interruptor in circuit with the generating winding, said interrupter maintaining the circuit `of the generating winding closed during thev whole of the recoil of the rotor, and means for operating the interrupter to maintain the circuit of the generatin `winding in open condition during the maJor portion of time immediately prior to the recoil of the rotor under the tension of said spring means.

14. In combination with an ignition magneto of the oscillating type, means arranged to insure that the circuitincluding the vinagneto generating winding-is open during a substantial portion of time prior to the re-v coil of the rotor and closed during the whole of the -recoil of the rotor.

y, ln witness whereof, I ax my sli-gnature.

@JOSEPH K. 'LEIBINQ

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