US1386231A - Electrical ignition apparatus for internal-combustion engines - Google Patents

Description

F. BILLON. 'ELECTRICAL IGNITION APPARATUS FOR INTERNAL COMBUSTION ENGINES.

- APPLICATION FILED FEB. I3 I918.

1,386,23 1. Patented Aug. 2, 1.921.

2 SHEETSSHEET I.

M... I 6 km I 5 [/14 9 x7 K I 53 .5 Z

FQBILLON. ELECTRICAL IGNITION APPARATUS FOR tNTERNAL COMBUSTION ENGINES.

v APPLICATION FILED FEB. 13, 1918.

Patented Aug. 2, 1921.

2 SHEETS-SHEET 2 INVENTUR Ffii/llam BY /P,/dyw&fi1

ATTORNEY UNITED STATES PATENT OFFICE.

FBEDERIC BILLON, OF'SOLOTHUTRN, SWITZERLAND.

i ELEJTBIOAL rcm'rron arraaarus FOR INTERNAL-communion micmns.

Specification of Letters I 'atent.

Patented Aug. 2, 1921.

Application'flled February 13, 1918. Serial No. 216,905.

In'i ition a paratus of the kind speciw fied in atent 0. 1,361,133 granted December 7th, 1920, the weight of the rotor is perfectly balanced from a dynamic point of view. In some constructions according to .the said patent, the static balance'however can be produced only by the use of special counterweights.

The present invention allows of producing a balance of the weight both statically and dynamically without the use of special counterweights in connection with the rotor of the ignition apparatus. This is effected according to the present invention by a pcculiar formation of the parts that constitute the magnetic circuit of the apparatus. This improved formation consists .in arranging the pole pieces of a pole both as regards the fixed portion as well as the rotary portion, in two groups in the axial direction side by side with a gap between, while the corresponding pole pieces of the other pole are not so subsdivided and are arranged opposite to this gap.

This improved arrangement allows the masses of both the rotor and the stator to be distributed symmetrically in a complete manner to a central plane in the direction of the axis, and at the same time also symmetrical to a plane at right angles to the axis, so that the masses are balanced dynamically as well as statically.

This same arrangement allows of having always 'on both sides equal overlapping of the pole pieces, so that the magnetic forces are equally balanced.

Two constructional examples of this invention are illustrated in the drawings.

Figure 1 illustrates perspective views of the two sides of the stator, with projecting double poles on one side thereof and a single pole on the opposite side, all provided with concave faces.

' Fig. 2 is a slmilar view of the correspondingrotorwith bifurcated pole pieces, consistlng of a permanent magnet. Fig. 3 illustrates a cross section through 'the yokes and the rotor in their assembled condition.

Figs. 4. and 5 illustrate diagrammatically the mutually opposite pole surfaces of the yoke and the rotor in different relative posit ons, in developed views, showin the positions of the rotor in which the ux passes through the zeropoint.

Figs. 6 to 10 illustrate a-modified constructional form, in which- I Fig. 6 shows in perspective views of the two sides of the yoke; Fig. 7 shows a cross section through the parts of" the yoke and the rotor in their assembled condition, and

Fig. '8 the. corresponding rotor;

Figs. 9 and 10 are diagrammatic views of. opposite pole surfaces of the yoke and therotor in different relative positions,-in developed views, showin the positions of the rotor in which the ux passes through the zero point.

In both constructions the stationary ortion of the magnetic circuit is constitute by a yoke that carries the induction winding, while the rotary portion consists of a permanent magnet. I

Referring to Figs. 1 to 5, v

Fig. 1 shows the two side members of the yoke formed with projecting poles. One side member of the yoke is s lit in such a manner that the two portions and B thereof have a gap between them. Opposite this ga is arranged the pole piece C of the other si e member of the yoke. Fig. 2 shows the rotor in which the yoke members formed by suitable recesses in the cylindrical periphery of the magnet, arearranged in an analogous manner. In this rotor the pole pieces N-are subdivided into two groups. Opposite the gap situated between the two groups there are arranged the pole pieces S of the other pole.

The positions of the pole pieces A and B of the fixed the positions and S of the rotor, are illustrated respectively in Figs. 4 and 5 which i are developed views showing those positions of the rotor in which the flux passes through Eortion or stator relatively to the zero point, and the igniting spark is produced.

The position shown in Fig. 4 corresponds to the position of the rotor shown in;Fig. 3 in which the N-plple is leaving the stationary portions A and and the S-pole is leaving the stationary portion C on the yoke.

Fig. 5 shows the position which is reached after about half a revolution, in which the S-pole is leaving the portions A and B, and theN-pole is leaving the portion C 0n the stator.

A comparison of the position, for example, of the N-pole in Fig. 4, with the position shown in Fig. 5, shows thatin one revolution two ignitions are produced at angular distances apart of 180 g and 180 5 By suitable formation and dimensions of the projections or recesses of the pole pieces,

the angle 2 and consequently the time-interval between two successive ignitions may be chosen to suit the angle a of the cylinders of the internal combustion engine.

In the constructional form of the improved ignition apparatus illustrated in Figs. 6 to 1.0, the rotor has projecting pole pieces, while the pole pieces of the stator are formed by recesses.

Figs. 6 to 10 correspond respectively with Figs. 1 to 5, andthe e uivalent parts are marked with the same re erence letters as in the last mentioned figures.

What I claim is v "In an electrical ignition apparatus for an internal combustion engine, for producing any desired time-succession of the ignitions the combination of a stator of which one pole piece is subdivided so as to form two groups of pole tips, said groups being located axially side by side, but separated by a gap, and a rotor of which one pole piece is subdivided so as to form two groups of pole tips, said groups being located axially side by side, but separated by a gap, while the pole pieces of the other pole of both said stator and said rotor are located respectively opposite said gaps.

In testimony whereof I have signed my name to this specification.

FREDERIC BILLON.

Images