JPH059502Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is an internal combustion engine having a magnetic pickup, a rotating shaft facing the magnetic pickup to which a signal rotor is fixed, and an ignition coil through which the rotating shaft is inserted. This relates to power distribution equipment.

[Conventional technology]

Conventionally, as this type of power distributor, one shown in FIG. 4 has been proposed. In the figure, 1 is a housing made of aluminum or the like, and 2 is an internal combustion engine (not shown) that is pivoted to the housing 1 via metal.
3 is an ignition coil installed in the housing 1 with the rotating shaft 2 inserted therethrough; 4 is a signal rotor fixed to the rotating shaft 2; 5 is a signal rotor 4; 6 is an ignition timing control unit that determines the ignition timing based on the output signal of the magnetic pickup 5 and controls the primary current of the ignition coil 3; 7 is the secondary voltage of the ignition coil 3; 8 is a power distribution rotor having a rotor electrode 8a that is in sliding contact with the center electrode 7 and is fixed to the rotating shaft 2; 9 is a cap that is fitted and fixed to the housing 1; 10 is a cap 9; A high voltage for ignition (secondary voltage of the ignition coil 3) is sequentially distributed from the center electrode 7 to the rotor electrode 8a through the peripheral electrodes provided at several locations around the entire circumference of the engine corresponding to the number of cylinders of the internal combustion engine.

In the device configured as described above, when the internal combustion engine rotates, the rotating shaft 2 and the signal rotor 4 rotate in synchronization with the rotation, and the magnetic pickup 5 receives an output signal synchronized with the rotation of the internal combustion engine. occurs. Based on the output signal of the magnetic pickup 5, the primary current of the ignition coil 3 is controlled by the ignition timing control unit 6, and at the ignition timing, the primary current is suddenly cut off, causing a sudden change, and a high current flows to the secondary side. Voltage is generated. The secondary voltage of the ignition coil 3 is applied to the center electrode 7 via a lead wire (not shown), and is then sequentially distributed to each peripheral electrode 10 via the rotor electrode 8a as the power distribution rotor 8 rotates, and is sequentially distributed to each cylinder. ignites the engine to continue operating the internal combustion engine.

[Problem that the invention attempts to solve]

In the above-mentioned conventional power distributor of this kind, a part of the magnetic flux generated in the ignition coil 3 becomes the leakage magnetic flux 11, and is transmitted from the signal rotor 4 to the magnetic pickup 5 via the rotating shaft 2 as shown by the dotted line in FIG. There was a problem in that the magnetic pickup 5, which operates in synchronization with the rotation of the rotary shaft 2, would malfunction.

This invention was made to solve this problem, and the purpose is to provide a power distribution device for internal combustion engines that can prevent the magnetic flux generated in the ignition coil from leaking to the rotating shaft and prevent the magnetic pickup from malfunctioning. shall be.

[Means for solving problems]

The power distributor according to this invention is provided with a ring-shaped nonmagnetic conductor around a rotating shaft.

[Effect]

In this design, the non-magnetic conductor is a ring that surrounds the rotating shaft that forms the leakage magnetic path, so the non-magnetic conductor is a bearded coil that generates current in a direction that prevents changes in the magnetic flux passing through its inner diameter. becomes. This prevents magnetic flux from leaking from the ignition coil to the rotating shaft.

〔Example〕

1 and 2 show an embodiment of this invention, and in the figures, numerals 1 to 10 are the same as the conventional one. Reference numeral 12 denotes a tubular non-magnetic conductor press-fitted into the inner surface of the shaft insertion hole 3a of the ignition coil 3, and is made of copper, for example.

When the tubular non-magnetic conductor 12 is press-fitted and fixed into the inner surface of the shaft insertion hole 3a of the ignition coil 3 in this way, the non-magnetic conductor 12 becomes a circular coil and rotates from the ignition coil 3. Prevents leakage of magnetic flux to shaft 2.

In the above embodiment, the non-magnetic conductor 12 is inserted into the shaft insertion hole 3.
Although it is press-fitted into the ignition coil 3, it may be welded or may be formed integrally with the ignition coil 3. Further, instead of the shaft insertion hole 3a of the ignition coil 3, it may be fixed to the outer circumferential surface of the rotating shaft 2 by means such as crimping or welding.

Furthermore, although the tubular non-magnetic conductor 12 is shown in the above embodiment, it may be a non-magnetic conductor 12A consisting of several rings as shown in FIG.

Furthermore, although the non-magnetic conductor 12 is provided at the position of the ignition coil 3 in the above embodiment, it may be provided between the signal rotor 4 and the ignition coil 3.

Note that when the leakage of the magnetic flux of the ignition coil 3 is prevented by the nonmagnetic conductor 12, the effective inductance of the ignition coil 3 is stabilized, so that electrical controllability is improved.

[Effect of idea]

As explained above, this invention has the effect of preventing magnetic flux generated in the ignition coil from leaking to the rotating shaft, thereby preventing malfunction of the magnetic pickup.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing one embodiment of the invention, FIG. 2 is a perspective view showing the non-magnetic conductor shown in FIG. 1, and FIG. 3 is a perspective view showing a different embodiment of the non-magnetic conductor. FIG. 4 is a longitudinal sectional side view showing a conventional power distributor. In the figure, 2 is the rotating shaft, 3 is the ignition coil, 3
4 is a signal rotor, 5 is a magnetic pickup, and 12 is a non-magnetic conductor. In addition,
The same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A housing, a magnetic pick-up installed in the housing, and a rotating shaft facing the magnetic pick-up to which a signal rotor is fixed and rotatably supported by the housing;
In a power distribution device for an internal combustion engine having an ignition coil built into the housing such that the rotating shaft is inserted therethrough, a ring is provided around the rotating shaft so as to prevent leakage of magnetic flux from the ignition coil to the rotating shaft. A power distribution device for an internal combustion engine, characterized in that it is provided with a non-magnetic conductor having a shape. (2) The power distribution device for an internal combustion engine according to claim 1, wherein the non-magnetic conductor has a tubular shape that can be fixed to the entire inner surface of the shaft insertion hole of the ignition coil.