DE2050757A1 - Magnetic ignition distributor - Google Patents

Description

The invention relates to a distributor for the ignition circuit of an internal combustion engine and is particularly suitable for the ignition circuits of the internal combustion engines of motor vehicles.

In conventional ignition systems for internal combustion engines Regardless of whether they are electrical or electronic, a high voltage will drive the spark plugs through an electrical one Distributor fed, which by means of a rotor finger, which is directly or indirectly through the motor is driven, the secondary winding of the high-voltage transformer (or the ignition coil) with each spark plug selectively connects.

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The use of an electrical distributor of this type is due to the electrical nature of its operation various disadvantages. Probably the most important These disadvantages, from the point of view of passenger safety, is that an electric Distributor induces a spark during operation, which in the event of an accident can cause a fire, that spilled gasoline ignites. Of course, this must be avoided if at all possible.

Another disadvantage of conventional distributors is that they can work under conditions of increased humidity, not working properly in rain etc. In such conditions, the insulation will often break down, what an irregular way of working or a complete one Failure of the ignition.

This problem of insulation and high voltage distribution requires special devices and a special design and regular maintenance to prevent local insulation breakdown and "creep" i.e. to prevent discharge along certain paths in parts of the insulation that have been damaged. In addition, there are periodic checks on the rotor finger and the fixed contacts that interact with it necessary because these parts are exposed to wear and tear.

After all, the occurrence of electrical sparks is one

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known cause of radio interference, so that normally Steps must be taken to suppress this interference.

A magnetic ignition distributor according to the invention for Internal combustion engines have a primary winding with a core made of magnetic material, a number of secondary windings for connection to the spark plugs, which secondary windings each with a core made of magnetic Material are provided, and a rotatable yoke made of magnetic material, whose axis of rotation is to the magnet core the primary winding is coaxial and that is rotatable at a speed that corresponds to the speed of the Internal combustion engine is related to a magnetic circuit between the core of the primary winding and to complete the core of each of the secondary windings in turn.

Preferably, a fixed yoke is provided which cooperates with the ends of the magnetic cores that the rotatable yoke are removed to form the remainder of the magnetic circuit.

The following is an example embodiment of the invention in connection with the accompanying drawings, namely show:

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Fig. 1 is a view of an embodiment of an inventive Distributor in section and a possible drive system for the rotating yoke and

Fig. 2 is a view in section along the line II-II in Fig. 1.

The illustrated in Fig. 1 and generally designated 10 has a mechanical drive 11, the is driven by the internal combustion engine to which the distributor is assigned, which drive 11 is a drive chain and a sprocket 12 cooperating with this owns.

As best seen in FIG. 2, the distributor is provided with a transformer having a central core 13 has, on which the primary winding 14 is wound, and a number of further cores 15 at a distance "around the central core 13, each of which carries a corresponding secondary winding 16.

The number of magnetic cores 15 and thus the secondary windings is equal to the number of spark plugs in the internal combustion engine. In the embodiment shown in the drawings, there are six secondary windings with one 'Angular distance of 60 ° is provided so that this embodiment is suitable for an internal combustion engine with six spark plugs

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is suitable.

The magnetic cores of all these windings have the same length and a fixed yoke 17 is arranged so that it is over one end of each of the cores 13, 15 to provide a path for magnetic flux from the core 13 of the primary winding 14 to form the cores 15 of the secondary windings 16. This yoke is through a Plate 17 formed from ferromagnetic material that is conveniently attached to the housing 20 of the distributor. In the illustrated embodiment, there is an air gap T between the yoke 17 and the magnetic cores 13, 15 is provided. This air gap can of course be omitted in other embodiments. At that end the magnetic cores 13, 15, which faces away from the yoke 17, is also a rotatably mounted yoke 2 2 made of ferromagnetic material. The axis of rotation of the sudden 22 is coaxial with the axis of the core 13. The rotatably mounted yoke 22 is mounted on a shaft 21 and arranged so that there is an air gap T ^ between them itself and the magnetic cores 13, 15 limited. The speed of the shaft 22 and thus of the rotatable yoke 22 is in Controlled as a function of the speed of the internal combustion engine. The yoke 22 is shaped to be magnetic Circle completed by the magnetic core 13 of the primary winding IH and each of the cores 15 of the

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Cores 15 of the secondary windings 16 are sequentially formed as the yoke rotates.

The yoke 22 therefore acts essentially like a circumferential contact, but instead of high-voltage electrical energy to be transferred to the various spark plugs, as is the case with conventional distributors, It transfers magnetic energy to the "cores of the various secondary windings, their induced voltage then transferred to the spark plugs.

The yoke 22 is therefore shaped and sized so that it the end of the core of the primary winding and that of the core of the respective secondary winding over which it is is located, covered.

In practice, it is advantageous to place the magnetic cores and P the windings corresponding to them in an insulating compound include, which may consist of a suitable resin or a liquid dielectric, which is expedient the interior of the housing 20 can fill.

As a connection for the primary winding and the secondary windings, connections are preferably, as shown in FIG. 1, for example the connection C, which is shown connected to the primary winding I ¹ I, at the ends

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of the windings adjacent to the yoke 17 are provided. The secondary windings can, if necessary, directly be connected by a cable with the respective spark plug, which has the advantage that with the high voltage related insulation problems, which always exist with conventional distributors, are avoided.

The primary winding 14 is supplied with electric current during ignition when the rotating yoke 22 in the desired magnetic coupling position between the core of the primary winding and the core of one of the secondary windings. The supply circuit the primary winding can be either conventional or electronic. The primary winding can also can be supplied directly from the vehicle battery. In this case, the circumferential yoke would have to be suitably shaped so that the necessary changes in the current flow induced by its movement can be obtained.

Various modifications can be made as further embodiments of the invention by those skilled in the art. For example, the transmission that drives the rotatable yoke 22 can be different from that described deviate from the respective structural requirements.

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The magnetic cores for the primary winding and the secondary windings are shown as square in shape, although these can also have a different shape and for example can be round. From the foregoing it follows that the magnetic distributor described in one single container has the distributor and the ignition coil. Finally, there is the distributor according to the invention particularly suitable for electronic ignition systems, as in this case the bulkiness of the secondary windings is greatly reduced.

Claims;

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Claims (3)

Patent claims: ) Magnetic ignition distributor for internal combustion engines, characterized in that a primary winding (14) has a core (13) made of magnetic material, a number of secondary windings (16) are provided for connection to a spark plug each, which secondary windings (16) each have a core (15 ) made of magnetic material, and a rotatably mounted yoke (22) made of magnetic material, the axis of rotation of which is coaxial with the magnetic core (13) of the primary winding (IH), is arranged so that it can be driven at a speed that corresponds to the Engine speed is related to complete a magnetic circuit between the core (13) of the primary winding (IH) and the core (15) of each of the secondary windings (16) in turn. 2. Distributor according to claim 1, characterized in that a fixed yoke (17) is provided which with the Ends of the magnetic cores (13, 15) cooperating, which are turned away from the rotatable yoke (22) to the remaining 109818 / U01 to form a magnetic circuit. 3. "Distributor according to claim 1 or 2, characterized in that the rotatable yoke (2 2) both the one end of the magnetic core (13) of the primary winding (1Ό as well as one end of the magnetic core (15) of the respective Secondary winding (16) can cover substantially and is arranged so that it is in the so formed magnetic circuit bounded by an air gap (T ^) ". For FIAT Societä per Azioni 109818 / U01 Blank page