US1261345A - Ignition apparatus for internal-combustion engines. - Google Patents

Description

J. BUUR. I GNITION APPARATUS FOR INTERNAL COMBUSTION ENGI NES Iv APPLICATION FILED MAR. 9. I915.

Patented Apr. 1918 ii 2. Fig.3. Fig.4.. Fig. 5. 1 0 mow; F 5m.) oz w M UNITED STATES PATENT OF ICE.

JOSEPH ZBIJUR, on NEW YORK, N. Y;

IGNI TION APPARATUS FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Application filed March 9, 1915. Serial No. 13,135.

T 0 all whomz't may concern:

Be it knownthat I, J OSEPH BIJUR, a citi- Zen of the United States, and residingat 122 East GOthstreet, N. Y., in the county of New York and State of New York, have invented a new and Improved Ignition Apparatus for Internal-Combustion Engines,

. of which the following specification i's'a full disclosure.

This invention relates to'ignition apparatus for internal combustion engines and more particularly for those engines liable to frequent speed changes such as are employed in motor vehicles.

One of the objects thereof is to provid practical apparatus of the above type in which efficient action is attained under all conditions of use. Another object is to provide apparatus of the above type of simple construction and the most reliably automatic action. 7 Another object is to provide apparatus having theabove characteristics in which objectionable effects of vary ing engine speed upon the ignition of the engine are done away with. Other objects willbe in part obvious and in part pointed out hereinafter.

This invention accordingly consists in the features of construction, combinations of elements and arrangement of parts which will baexemplified in the construction hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawing in which is illustrated one of various possible embodi-' ments of this invention,

Figure lis a diagrammatic plan of the same, certain parts being shown in section in order to disclose the construction more clearly.

Fig. 2 is a diagrammatic view indicating one stage of action of the parts.

Figs. 3, 4 and 5 are similar views showing successive stages of action of these parts.

.Similar reference characters refer to similar parts throughout the views of the nected with the ignition devices diagrammaticallyindicated at 6. From this point the circuit leads to a contact screw 7 by means of the adjustable contact 8 coacting' Patented Apr. 2, 1918.

with a contact 9 upon a pivoted oscillatory lever 10 and a spring 11. The mechanical as well as electrical action of the parts last referred to will be later described, but it may here be noted that they constitute an interrupting device which is shunted by the condenser 12, the latter performing its ordinary well known functions.

A parallel electrical circuit leads from the same terminal of battery 1 through the resistance element 13, screw 14-, pivoted lever 15, contacts 16 and 17, lever 10 and sprin 11 to the screw 7. 'The contacts 16 and 1 form an interrupting device for this branch which may be shunted by a high resistance 18 or a condenser to reduce sparking. From the screw 7 the above circuits are joined and led serially through a conductor 19 and an inductance coil 20 to the remaining terminal of the battery. Inductance coil 20 is of such a nature as to have a large selfinductive effect and is so arranged as to be adjustable in inductance either by varying the number of coils in circuit, as by the bearing, as indicated by the dotted line 22,

so as to swing about tllGflXiS of the shaft 23 and there are provided an arm 24: and manuallyactuated means 25 to swing this casing angularly and thus vary the time of action of the interrupting devices with respect to theangular position of the shaft 23, the latter being driven in fixed relation to the crank shaft of the engine.

In this manner, the ordinary manual ad-v vance or retardation of the time of ignition with respect to the position of the piston may be gained. I

Mounted upon shaft 23 is a cam 26 which coacts with the cam roller 27 and oscillates the lever 15 pivoted at 28, the latter being held firmly -'against the cam by the spring 29. The above operation of lever 15 causes in which contacts 8 and Qare' separated. A's

it to swing contact 16 intoengagement with .the contact 17 and in turn swing the lever 10 about the axis-30 to move contact 9' out of engagement with contact 8 and interrupt the main circuit through, the ignition coil 3.

Considering now the action of this apparatus and assuming that the ignition circuit be'closed as by the hand switch 31, it will be assumed that the roller 27 is resting 10' within one of the recesses 32 of the cam 26.

With the parts in this position, the spring 29 will have retracted contact 16 from contact 17 and permitted the'spring 11 to throwcontact 9 into engagement with contact 8; This position of the parts is diagrammatically dicated in Fig. 2 of the drawing. As the I cam 26 now rotates, one of its projections en-.'

gages and throws outwardly the roller 2.7, swinging contact 16 toward contact17. The

instantaneous engagement of these parts-is- I depicted in Fig. 3 of thedrawingpbut 1t 1s to be understood'that the time of this connection is extremely minute-as the lever. 15 is swinging rapidly and instantly upon its engagement throws the lever 10 toward the position indicated in Fig. 4 of thedrawing,

the roller 27 rides over the cam projection, the lever 15 under the action of. spring 29 quickly swings in a reverse direction, the instantaneous position in which it permits contact 9 to engage contact 8 before, contact 16 has left contact 17 being shown in Fig. 5

through inductance coil 20, contacts 16 and.

17 and tlie resistance 13. The flow of current in this circuit builds up the-magnetic field of the coil 20. The next operative position of the parts is shown in Fig. 2' of the drawing after they have passed through the position indicated in Fig. 5, the latter position, a s'above noted, being assumed for such an extremely short time that it is without effect. As shown in Fig. 2, the circuitthrough coil 20 and resistance' 13. is broken at the contacts 16 and 17, the resistance 18 being of such an excessively high value as toafford no substantial path for the current. The breaking of this circuit causes a tendency of the magnetic field or lines of force of the inductance coil 20 to collapse'which,'as

.is well known, generates an instantaneous electro-motiveforce of high voltage in the direction in which the current has been flowing. It isunnecessary to go into the details of this action. as it is the well-known extra current or tendency of a current to persist in an inductive circuit after thecir- .cuithas been interrupted. This 'self-indue. tiv'e current here finds an outlet through the lever 10, contacts 9 and 8 andprimary coil 3, and thus tends instantaneously to force a .current through the latter coil. above described the apparatus isinthe position shown in Figs. 3 and 5 for but an inappre- 'ciable amount of time so that itseffect may be substantially neglected. It "should be noted, however, that in this position thecurrent from the battery l will vtake the easier path through contacts 16'17 rather than, that through contacts 89' and coil 3.- Itjis, therefore, clear that coil 20 will build up before coil 3.v The closing of contacts 8 and 9, however, completes a circuit through coil 3, as hereinafter described, which tends to .force a current through this coil in the same 3 is able to gain its full-effective value.

Also, if the. parts were so arranged and'proportioned that a satisfactory current value in coil 3' would be obtained at the hi hest engine speed, then at .low engine spee s, when there Isa sufficiently long period of contact to permit the current to overcome the inductive effect, the current value reached might be v harmful in its heating and arcing effect. In the present case, however, even at the highest engine speeds, an ample current in coil 3 is provided due to the above-described inductive discharge of the coil 20' which, so to speak, kicks the current in coil 311p to its desired value. In this manner, the inductive effect of coil 20 is made to neutralize the undesirable inductive effect of coil 3'and the ignition is entirely satisfactory, even at the highest engine speeds. It may also be noted that as there is a collapse of the magnetic field coil 20 to gain this inductive E. M. F there may be at slow engine speeds, and'consequent long periods of contact, an increase of current above its minimum value, which builds up the field of coil 20, and hence the inductance of the latter coil not only aids by bolstering up the current in coil 3 at high engine speeds, but by opposing the current in this circuit at 'low engine speeds during the later stages of contact, when it might otherwise reach a higher value.

It will thus be seen that there is provided apparatus in which the several ,objects of this invention,are achieved.

As many changes might be made in the above-construction, and as many apparently different embodiments might be made of this invention without departingfrom the scope thereof, it is intended that all features heren described or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having thus revealed this invention, I.

- qta'nce of said second coil to reduce the effect of the inductance of said first coil.'

2. In ignition apparatus for internal combustion. engines, in combination, a source of current, a coil connected therewith, a second coil, and means adapted to utilize the induc tance of said second coil to neutralize the' i effect of the inductance of said first coil.

.3. In ignition apparatus for internal combustion engines, in combination, a. source of current, a coil connected therewith, a second coil, means adapted to utilize the induc- ,tance of said second coil to neutralize the effect of the inductance of said first coil, and means adapted to adjust the effective inductance of said second coil. 7

4. Injgnition apparatus for internal combustion engines, in combination, a source of current, a coil connected therewith, an inter-' rupter in circuit with said source of current and said coil, a second coil connected-to receive current, and meansadapted to cause said second coil to discharge its self-inductive-current through said first coilas the circuit through the latter is periodically completed by said interrupter,

I 5. In ignition apparatus for internal combustion engines, coinbinatiom'a source of current, a coil, means connecting said coil with said source of current, and means adapted as said coil is connected to generate a momentary electro-motive' force in the direction of flow of current in said coil.

' 6. In ignition apparatus for internal coinbustion engines, in combination, a source of current, a coil serially connected with said source of current, a pair of branches in series with said coil and in parallel with each other, a coil in one of said branches, and

means adapted alternately and oppositely to vary'the current in said branches.

7 In ignition apparatus for internal combustion engines, in combination, a source of current, a coil serially connected with said source of current, a pair of branches in series with said coil and in parallel with each other, a coil in one of said branches, and means adapted alternately to interrupt the current in said branches.

8. In ignition apparatus for internal combustion engines, in combination, a source of current, a coil serially connected. with said sourceof current, a pair of branches in series with said coil and in parallel with each other a coil in one of said branches, and means adapted alternately to. interrupt the current in said branches 'andconnect both branches in parallel prior to each interruption.'

9. In ignition apparatus for internal combustion engines, in combination, a source of current, a coil serially connected with said source of 'current,-a pair of branches connected with said source of current in parallel with each other, a coil in one of said branches, a pair of relatively separable coacting contacts in one of said branches,.a

pair of relatively separable coacting contacts.

in the other of said branches, a movable member having one contact of each pair mounted thereon, a movable member having the remaining contact of one pair mounted 1 bustion engines, in combination, a source of current, a coil serially connected with said source of current, a pair of branches connected with said source of current in parallel with each other,.a coil in one of said branches,a pair of relatively separable coacting contacts in one of said branches, a pair of relatively separable coacting contacts in the other of said branches, a movable member having one contact of each pair mounted thereon, a movable member having the remaining contact of one pair mounted thereon, means adapted intermittently to move said second member and thereby bring its contact-into engagement with one of the contacts of said first member and move the second contact of said first movable member out of engagement with the contact with which it coacts, and resilient means connected to oppose the said movements of the said movable members.

11. Iii-ignition apparatus forinternal coinbustion engines, in combination, a source ott current, a coil serially connected with said source of current, a pair of branches in series with said coil and in parallel with-each other, a coil in one of said branches, a pair of relatively separable" coacting contacts in one of said branches, a pair of relatively separable coacting contacts in the other of said branches, a movable member'having one cam positioned and driven to move said second member and thereby bring its contact into engagement with one of the contacts of said first movable member -and move the other contact of said first movable member away from the contact with which it coacts. 12. In ignition apparatus for. internal combustion engines, in comb1nat1on,a source of current, acoil serially connected withsa d source of current, a pair of branches in. vseries with said 001i and in parallel w1th each other, acoil 1n one of said branches, a pair of relatively separable coacting contacts in one of said branches, a pair of relatively separable coacting contacts in the other of said branches, a movable member having one contact of each pair mounted thereon, movable member having the remaining contact of one pair mounted thereon, and a rotary cam positioned and driven -to move said second 'member and therebybring its contact into engagement with one of the contacts of said first movable member and move the other contact of said first movable member away from the, contact with which it coacts, said movable members being mounted to swing as they move about pivotal points.

.13..In lgnltion apparatus for internal combustion engines, in combination, a source of current, a coil serially connected with said source of current, a pair of branches in series with said coil and in parallel with each other, a coil in one of said branches, a pair of relatively separable coacting contacts in onset said branches, a pair of relatively separable coacting contacts in the other of said branches, a movable member having one contact of each pair mounted thereon, a movable member having theremaining contact of one pair mounted thereon, a rotary cam positioned and driven to move said second member and thereby bring its contact into engagement with one of the contacts of said first movable member and move the other contact of said first movable member away from the contact with which it coacts, said movable members being mounted to swing as they move about pivotal points, and resilient means resisting the said movements of said movable members.

14. In ignition apparatus for internal combustion engines, in combination, an elec- 15. In' ignition apparatus for internal combustion engines, in combination, an electric circuit comprising a coil and a source of current, a device. for eriodically varying of said second coil to offset the effect of the inductance of said first coil.

16. In ignition apparatus for internal combustion-engines, in combination, an electric circuit comprising a member having a substantial inductance, means for periodi cally varying the current in said member,

and electrically actuated means for compensating for the effect of the inductance of said member in tending tolessen the value which the current therein reaches as the speed of said varying means increases.

17 In ignitionv apparatus for internal combustion engines, in combination,- a source of current, an interrupter and a primary coil serially connected with said source of current, a secondary coil operatively related. to said primary coil, means adapted to drive said interrupter at varying speeds, and means adapted to neutralize the inductance of said primary coil.

18. In ignition apparatus for internal combustion engines, in combination, a source of current, an interrupter and a coil connected with saidsource of current, means adapted to oppose the rise of current in said coil, and means adapted to render said opposing means operative'subsequent to the closing of the circuitthrough said coil.

19. In ignition, apparatus for internal combustion engines, in combination, a source of current, an interrupter and a coil connected with said source of current, means adapted to oppose the rise of current in said coil, and meansadapted to render said opposing means operative-at a predetermined period subsequent to the closing of the circuit through said coil. I

20. .In ignitionx apparatus for internal combustion engines, in combination, a source of current, an interrupter and a coil con-v witnesses.

JOSEPH BIJUR. IVitnesses: l It. S. BLAIR,

L; LEVIT.

Images