US1613033A - Flywheel magneto - Google Patents

Description

'Jan' 4 1927' w. w. HAwKlNs 1613033.

mman uAGNETo Filed Feb. zo, '1922' 4 Sheets-slaapt 1 N SQ h Jan.

4 1927 w. w. HAwKlNs FLYWHEEL MAGNETO Filed Feb. 20, 1922 4 Sheets-Sheet 2 a 4 1927 w. w. HAwKlNs FLYWHEEL MAGNETO Filed Feb. 20, 1922 4 Sheets-Sheet 4 Pemba im. 4,1921.

` UNITED sTATEs PATENT OFFICE.

WILLIAI W. nwm, OF'BBOOKLYI, NEW YORK, ABSIGND T0 WEBSTER ELECTRIC QOIPANY, 0l' BAGUE, mlm, A OOEPOBLTION' 0F YIBGE'SIN.v

FLYWREEL IAGNETO.

Application Iled February 20, im. Serial le. 587,991.

This invention relates to ma netos of the type in which the rotary ele' ent ofthe magneto is carried on theffly wheel of the engine or motor.

The objectofthe invention is the rovision of a device of this characterw ich will have no delicate or, adjustable parts carried on the fiy wheel, and in\which the danger o f the parts of the device getting out of adjustment s reduced to the minimum.

One of the features of the ,invention resides in the provision of inner and .outer rotor elements Vbetween the paths of movement of which the relatively stationary elements of the magneto are arranged.

Another feature of the invention resides in the provision of an adjustable mounting member u n which is sup 'rted the rela'- tively statlon'ary elementso the m eto.

A further feature, and one relat to the one last referred to,'is the arrangement-on the adjustable but relatively stationary mountingA member ofthe interru ter and also a pei/)rtion of the distributor, t ese .elements in g so arranged that when the device is ad]usted to advance or retard the o ,eration'of theinterrupter, the distributor e ements are corres ndmgly adjusted. A still further. eatureresides in. the arrangement of parts so that the act of adjustingthe time of operation'of the interyrupter automaticall acts to similarly. adjust the time'of reversaof the magnetic lines in the coil core. 7

Other features of the .invention will appear as the description of theinvention progresses.

In the drawings- Figure 1 is a' sectional view on the yline 1--1 of Figure 2, looking in the direction of thearrows; y. Figure 2 is a section on the line 2-'2 of Figure 1, looking in thedirection of the arrows; Figure 3 device seen Figa 4-4 of Figure 2;

Figure 5 is a view of the device 'as viewed frin the left in Figure 1 the evice, showing a in i'ied form of transformer coils;

'Figure 7 is a schematic diagram indicat is a view yof the portion of the from .the line 3-3 of Figure 2;

re 4 is a sectional view on'the line re 6 is a section thiou h a portion of Figure 8 1s a view on the line 8-8 of Fi re 5;'

-igure 9 is a section on the line. 9-9 of F' re 5;

igure 4v10 is a circuit diagram of the arment shown in Figure 2; igure 11 is a sectional view through the device adjacent to the interrupter plate'as on Fthe line 11-11 of Figure 2 1- of Figure v2;

Figure 13 1s a section ron the line 13-13 of Figure 11; and

Figure 14 is a perspective view of an insulatmg collar forming part of the distributor.

The present arrangement is'particularly designed for a two cylinder, two cycle engine, so in reading the following description, 1t should be borne in mind that the device is arrangedto send an impulse of high tension current to each of the two 'spark plugs re 12 'is a section on thi-I line 12-12 once for each revolution, of the motor shaft.

Referring now to the drawings, 1 re resents the bearing `housing for the main s aft -2 of the engine or motor.

bearing carried by the housing 1. Secured to the end. of the shaft .2 by'means of thel spline or keyy 4 and the nut 5 is a fly wheel 6 provided with the annular iange 7. Mounted on' the fly wheel at diametrically opposite sides thereof, and adjacent to the flange 7, are the inductors 8 and 9, each of which consists ofa plurality of strips or laminations secured to the iiy wheel by means of the screws 12 and 13.

` Non-rotatably secured on the shaftv2 by symmetrically and the lammations or plates are secured screws or rivets 22.

Secured to one side of thehub 15, as by means ofthe screws 2,3, is the cam plate 24,

stationary portion of the magneto..

and 21. The 'inductors 18, 19, 20 and 21 are arranged about the hub 15,

between the flanges 16 and 17 by meansof- 3 indicates the which is provided on its diametrically opposite edges with the cam projections 25 and 26. Secured to the hub 15, but on the side opposite to the plate 24, is the distributor block 27 of any desired insulating material. Block 27 may be secured to the hub 15 in any desired manner, such as by means of screws'28.

Tt will be noted that between the flange 7 of the ily wheel and the inductors 8 and 9 adjacent thereto on one side and the assembly carried by the hub 15 on the other, there is an annular depression or space. The relatively stationary portion of the magneto is arranged to project into and occupy the major portion of this annular space between the outer and inner rotor elements or inductors. Adjustably mounted on the outwardl extending portion of the bearing 3 is the hull)I 29. Secured to or integral with the hub 29 is the supporting frame work of the relatively stationary elements'of the magneto, shown in section in Figure 2. This supporting frame work is preferably made as a casting of brass or other non-magnetic material.

Secured to the outwardly extending fiange 30 of the mounting plate. as by means of the bracket clips 3l, 32 and 33, is a permanent magnet 34 provided with the laminated pole pieces 35 and 36. The clips 31, 32 Aand 33 are secured to the mounting member by means of screws 37, 38 and 39. The laminations forming the pole pieces 35 land 36 are secured in position by means of the screws 40 and 41, which pass through the laminations and are received by the mounting plate of the relatively stationary members. i

Secured to the flanges 42 and 43 of the mounting plate, as by means of the rivets 44 and 45, are the hollow rectangular laminations 46 which form the hollow rectangular core 47 for the magneto coils. About one leg 48 of the core 47 are woundthe primary coil 49 and the secondary coil 50. About the other leg 51 of the core 47 is wound the tertiary coil 52. The connections for these coils is schematically indicated in Figure 10. Adjacent to the opposite vends of the coils are the heads 53 and 54 of liber board or other insulating material.

The distributor block 27 is provided with 'an annular channel 55 at thebottom of which is fixed the annular ring 56 of brass or other suitable material. p Threaded into a shoulder 57 of the mounting plate for the relativelyy stationar37 magneto elements is a sleeve or collar 58 of .insulating material. Slidably mounted within the collar 58 is the conducting brush 59, the outwardly extending end of which is arranged to engage the distributor ring 56.. Threaded within the outer end of the collar 58 is a contact element 60 to which is secured one end of' the conductor 61, the other end being connected Vto the high tension or secondary coil 50. A spring 62 acts to maintain tlze brush or wiper 59 in engagement with the ring 56, and also electrically connects the brush to the contact element 60. i

Between the plates 53'and 54 and at the side of the high tension winding is a plate 63 of fiber board or other suitable insulating material which may be secured between the plates 53 and 54 by means ot brads 64, or in any other desired manner. Mounted on the plate 63 is a conducting contact 65 which is electrically connected to the output side of the high tension coil 50.

Mounted about the high tension coil is the cover 66 of any suitable insulating material. This cover is provided on its inner surface with the conducting contact 67 which, when the cover is in place, is arranged to engage the contact 65 electrically joined to the high tension coil 50. The end oi' the conductor 61 remote from the contact Yis joined to the contact 67. Thus it Will be seen that at all times the output end of the high tension coil 50 is electrically connected to the distributor ring 56. The cover plate 66 at one edge thereof is arranged to project slightly into the depression 68 formed in the shoulder 57. The opposite edge is secured down by means of the spring hook 69 which 1s plvotally joined at 70 to the tanve 71 of the supporting plate for the relatively stationary elements of the magneto.

It will be noted that the channel 55 and the distributor ring 56 are mounted outside of and immediately adjacent to the hub 29 of the. relatively stationary mounting plate. Surrounding the distributor ring 56 and the annular groove 55, but secured to the stationary mounting plate is a ring of insulat- 10# ing material 72 which may be of shellacked paper, fiber board, or other suitable material. Mounted Within the wall 73 of the stationary mounting plate, as by screw threaded arrangement, are the contact 'supporting 110 blocks 74 of insulating material. These blocks are on diametrically opposite sides. Withineach block 74 is a contact element 75 from which extends the conductor 76 leading to a spark plug.

The insulating ring 72 is provided with diametrically opposite openings 77 which arepositioned at the points of the contact elements 75. Secured to the distributor block, in any desired manner, is a contact 78 which T3 is conductively joined to the distributor ring 56 by means of a conductor 79. It will thus be seen that during the operation of the motor, that is, while the shaft 2 is rotating, the contact 78 connected to the distributor ring 125 56 will be brought adjacent to each of the contacts 75 during each revolution of the shaft.

As previously described. the interrupter or cam plate 24 is fixed to the hub 15 of the 13 rotor and, therefore, rotates with the shaft 2. Y Pivotally supported on the relatively fixed mounting plate, as by the pivot pin 80, is the breaker or interrupter arm 81, provided at its free/end with the contact element 82 and on its inner surface, intermediate its'ends, with the projecting portion 83 arranged to be engaged by the cam projections and 26 on the cam plate 24. The interrupter arm 81 may be formed of stamped sheet metal having the upstanding side portions 84 and 85 between which the projection orlug 83 may bel secured bythe rivets 86. The fixed c ontact 87 of the interrupter .is arranged to co-operate with the movable contact 82. Contact 87 is joined by means of the conductor 88 to the condenser 89 which is mounted between the bracket members 90 fixed to the relatively stationary mounting plate.

The relatively stationary mounting plate is provided at one side with the hand piece 91 by means of which the mounting. plate may be adjusted about the bearing 3. The mounting plate is also provided with the spring catch 92 arranged to maintain the mounting plate in its adjusted position, A plurality of notches 93 may be provided to co-operate with the spring catch or retaining vmember 92. A series of notches 93 may bel provided so as to` ermit the operator to make any desiredda justment of the mountingplate or, if preferred, but three notches need be provided, one for the starting posi` tion, one for the high speed ahead position,

and the third for the reverseposition of the mountin plate.

The wiring of the device is schematically indicated in Figure 10. It ywill be noted that the primary winding 49 and the tertiary winding 52 are connected in paralleland the adjacent ends of these coils, as well as one end oi the high tension coil 50, is connected to round or to the frame of the motor, the ot 1er ends of the coils 49 and 52 being connected together and to the conductor 88 which joins the fixed interrupter contact 87 to the condenser 89. The movable interrupter contact 82 is connected 'directly to ground.

In Figures 6 and 7, a modification of thel device is shown lin which the tertiary winding is omitted. In this modification, the hol-v low rectangular core .piece is omitted and the core piece 94 is substituted. The pri-y marycoil 95 and the secondary or high tension coil 96 are wound about the core' 94 in much the same manner as the coils 49 and lows:

Assuming that the parts are 1n the relative positions indicated in Figure 1, and thatl the pole 35 of the magnet is the positive pole, the magnetic lines of force will extend from the magnet y34 through the pole ieee 35, the laminations 8, up throu h the aminations 46, through the laminations 20, pole piece 36 and to the other pole of the magnet 34. Assuming that the balance wheel is rotating in a clockwise direction, as viewed in Figure 1, it will be noted that an instant later the laminations 8 will be moved to a position-such that they will bridge the gap between the laminations 46 and the core piece 36. At the same time the laminations 21 will have been moved to a positionv to bridge the gap between the opposite ends of the laminations 46 and the core 35. We will now nd that the magnetic lines`will extend from the core laminatiohs 46 of the core 47 in the opposite direction. The path will now be from the right lleg of the magnet 34,v through the pole piece 35, laminations 21, laminations 46, laminations 8, pole piece 36 to the opposite leg of the magnet 34. A

Due to this quick reversal in the. direction -of the magnetic lines of force extending through the laminations 46, current will be set up in the coils 49 and 52 in parallel. The path of the current will extend from ground through the coils 49 and 52 in parallel through the contacts 87 and 82 directly to ground. At this inst-ant, due to the action of the interrupter, the contact 82 is separated from 'the contact 87, and the ldirect path to ground is interrupted. The current flow now existing in the coil 52 will act to oppose the current in the coil 49, causing the current in primary coil 49 to quickly die down, thus creating in the secondary coil a high potential impulse. At this instant the contact 78 joined to the distributor ring 56 is adjacent to one of the relatively fixed contacts 75 which is joined to the spark plug, and a high potential impulse will be transmitted to the spark plug, causing it to fire the charge Within the cylinder of the motor.

The present magneto arrangement has vbeen particularly designed vfor use with a two cylinder tWo cycle engine, and it will be noted that the operation, which has been above described, will take place twice for each revolution of the shaft 2. However, it' is apparent that modifications may be read- \ily made in the design of this apparatus so Ias to adapt it for use with motors of other characters.

'The modification shown in Figure 6 will operate in much the same manner as that above described, except that the tertiary coil is omitted and will not operate to o pose the current flowing in the primary coi Due to the peculiar construction described, if `the interrupter is moved around to change the time of the break, the pole pieces 35 and 36 are similarly adjusted so the reversal of direction of the magnetic lines in the core 47 takes place in the same relative relation lao to the opening of the interrupter contacts regardless of the adjustment of the mounting plate. (Not only this, but the contacts 75 are also adjusted so that, regardless of the position to which the. mounting plate is adjusted, one or the other is always` immediately opposite the contact 78 each time the interrupter contacts are opened. Vith the present arrangement, it is impossible for the parts to get out ot' adjustment relative to each ot' the others. 'lhe only adjustment to make is the time of the operation of the :interrupter contacts, and the other' adjustments follow automatically in making the interrupter adjustment.

lrVhile in the accompanying drawings and specification, the disclosure of the invention has been limited substantially to one detailed arrangement ot parts, it is to be understood that various modifications of therinvention are contemplated, and that the invention is to he limited merely hy the scope of the appended claims.

Vhat I claim is:

1. In a magneto, a fly wheel, an outer inductor rotatable with said fly wheel adjacent to the circumference thereof, an inner inductor rotatable with said fly wheel adjacent to the axis of said wheel, a normally stationary core mounted between the paths of said outer and inner inductors, a magnet associated with said core, and a coil on said core.

2. In a. magneto, a fly wheel, an outer in- Aductor onsaid fly Wheel adjacent to the circumference thereof, inner inductors on said fly wheel adjacent to the axis thereof, a magnet and a core mounted in the space between the aths of rotation of said outer and inner in uctors, and a coil on said core.

3. In a magneto, a fly wheel, outer inductors on said fly Wheel adjacent to the circumference thereof, inner inductors on said wheel adjacent to the axis of rotation thereof, a normally stationary core mounted Vbetween the paths of rotation on said outer and inner inductor-s, a magnet associated with said core, a coil on said core, and means for adjusting the position of said core.

4. In a magneto, a fly wheel, outer inductor-s on said wheel adjacent to the circumference thereof, inner inductols on said wheel adjacent to the axis of rotation of said wheel, a magnet, its pole pieces, and a core mounted in the space between the paths of rotation of said outer and inner inductors, a coil on said core, and means for adjusting the position of said magnet, pole pieces and core. f

'5. In a magneto, a shaft, a rotatable element thereon, an inductor element on said rotatable element remote from said shaft, another inductor element on said rotatable element adjacent to said shaft, a core arranged between the paths of saidl inductor elements. a magnet associated'with said core, and a coil on said core.

6. In a magneto, a hollow rectangular core, a primary coil on one leg of said core, a tertiary coil about another legr of said core, a secondary coil in inductive relation to said primary coil, and interrupter contacts, said primary and tertiary coils being in parallel relation when said contacts are closed, and in opposed series relation when said contacts are open.

In witness whereof, I hereunto subscribe my name this 27th da of January, 1922.

WILLIAI W. HAWKIN S.

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