JPS6226261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-contact ignition device for an internal combustion engine such as a motorcycle, and more particularly to an ignition signal generating device.

Ignition systems for internal combustion engines installed in motorcycles, motorboats, snowmobiles, etc. are required to operate satisfactorily even when used under adverse conditions. It is desired that the structure be both physically durable and easy to mass produce.

Conventional ignition signal generators for non-contact ignition devices are used to ignite the ignition signal by facing a magnet embedded in a flywheel attached to the rotating shaft of an internal combustion engine, or by facing a part of a magnet that excites another generator coil. A signal generator coil was installed to generate the ignition signal. In this case, the structure of a rotating body such as a flywheel in which the magnet is embedded becomes complicated, and the number of rotations is limited due to the strength of holding the magnet. In addition, there is an ignition signal generating coil that uses a part of the rotating body as an inductor, stacking the generating coil and the magnetic pole pieces of the magnet and installing the combined combination around the rotating body, but in this case, the generating coil , the combination structure of magnets, magnetic pole pieces, etc. becomes complicated, and since magnetic loss is likely to occur, the size is increased to compensate for this. Therefore, there were drawbacks such as decreased productivity and increased costs.

The present invention incorporates the latter magnet into the ignition signal generating coil, which is small, lightweight, strong, and highly reliable.
The purpose is to provide an ignition signal generator suitable for mass production, and its features include an inductor that rotates in synchronization with the rotation of the engine, and a generator coil device that is installed in a position that closely opposes the inductor. In the ignition signal generator, the generating coil device includes a generating coil, two magnetic pole pieces each having a flat head at one end, a bobbin around which the generating coil is wound, and a flange at one end of the bobbin. a synthetic resin winding frame having a U-shaped vertical groove at the other end and holes for inserting the magnetic pole pieces at positions spaced apart from each other on the inside and outside of the bobbin; A permanent magnet is arranged to be magnetically coupled to the back surface of the head of one of the two magnetic pole pieces, and a permanent magnet is arranged to be magnetically coupled to the back surface of the permanent magnet and the back surface of the head of the other magnetic pole piece. a coupling plate made of a magnetic material and inserted into the longitudinal groove so that the tips of the magnetic pole pieces protrude a predetermined distance from the hole; and a pair of coupling plates attached to the flange to which both ends of the generator coil are connected. A lead of the metal terminal provided along the metal terminal, the tips of the magnetic pole pieces of the generator coil device, the metal terminal, a device mounting portion integral with the coupling plate, and the flange portion. Cover the area other than the lead wire insertion hole leading to the wire attachment part,
and an exterior body made of a synthetic resin material having a protrusion provided with a pair of guide grooves for locking the lead wire in a portion adjacent to the coupling plate, and the lead wire of the exterior body is inserted through the guide groove. The device is characterized in that it has a lead wire that passes through the hole and is connected to the terminal.

FIG. 1 is a perspective view showing the configuration of an ignition signal generating coil according to an embodiment of the present invention. A winding frame 1 made of synthetic resin has a flange portion 8 having a protruding plate 10 at its tip, a vertical groove 5 with a U-shaped cross section at its rear end, and two holes at the bottom of the vertical groove 5. is provided. A generating coil 2 is wound around the center of the winding frame 1, and a pair of terminals 9 made of a metal plate are inserted into a gap provided on the upper surface of the flange portion 8 to connect both ends of the winding of the generating coil 2. There is. A rod-shaped magnetic pole piece 4a is inserted into the hole above the bottom of the vertical groove 5, and its tip is fitted into the hole in the projection plate 10, and a magnetic pole piece 4b is inserted into the lower hole at the bottom of the groove to connect the power generating coil. The center of the flange portion 2 is penetrated through the center of the flange portion 8, and its tip portion protrudes from the end surface of the flange portion 8.

After the magnetic pole pieces 4a and 4b are attached to the winding frame 1 in this way, the head of the magnetic pole piece 4b moves forward by the thickness of the magnet 3 relative to the head position of the magnetic pole piece 4a, so the magnet 3 is moved into the vertical groove 5. When inserted, the head of the magnetic pole piece 4a and the outer surface of the magnet 3 will be on the same plane. Thereafter, as shown in the figure, a T-shaped coupling plate 6 made of a magnetic material is inserted into the vertical groove 5 from below to press the pole piece 4a and the magnet 3 into tight contact. That is, the magnetic pole piece 4a,
A magnetic path with little magnetic loss is formed by the coupling plate 6, the magnet 3, and the magnetic pole piece 4b.

After the components are assembled in this manner, they are placed in a casting mold, and a synthetic resin material is injected and molded. The only metal parts exposed on the surface of the synthetic resin are the tip surfaces of the magnetic pole pieces 4a and 4b, the pair of terminals 9, and the mounting portion 7 of the coupling plate 6. Almost the entire surface of this ignition signal generating coil is covered with synthetic resin material that is mechanically strong and has good electrical insulation, so it is water resistant even when used for, for example, outboard motors or snowmobiles. , an extremely small magnetic path with low magnetic loss is constructed.

FIG. 2 is an explanatory diagram of the ignition signal generator, in which the same parts as in FIG. 1 are designated by the same reference numerals. Further, FIG. 3 is a sectional view taken along the line AB in FIG. 2, and FIG. 2 is a sectional view taken along the line CD in FIG. 3. As shown in FIG. 1, the ignition signal generating coil, which is assembled and molded from a synthetic resin material, is screwed to the crankcase of an internal combustion engine using the hole in the mounting portion 7. on the other hand,
A metal flywheel 13 attached to the rotating shaft of the internal combustion engine faces the flange end face of the ignition signal generating coil, and a pair of metal inductors 12 are attached to the flywheel 13 on the exposed end faces of the magnetic pole pieces 4a and 4b. fixed in close proximity.

When the flywheel 13 rotates, the inductor 12
a and 12b also rotate to interrupt the magnetic path formed by the magnetic pole pieces 4a and 4b. That is, as shown in FIG. 3, a magnetic pole piece 4a, an inductor 12a, a flywheel 1
3. A magnetic circuit passing through the inductor 12b, the magnetic pole piece 4b, the magnet 3, and the coupling plate 6 is formed, and the flywheel 1
3 and passes a location where there is no inductor 12, the magnetic circuit is interrupted. Therefore, a pulsed current is generated in the generator coil due to a change in the magnetic flux passing through the generator coil 2, and the voltage signal thereof is taken out to the outside via the terminal 9 as an ignition signal.

FIG. 5 is a diagram showing the relationship between the rotation angle of the inductor and the ignition signal voltage, where the horizontal axis shows the rotation angle of the inductor 12, and the vertical axis shows the ignition signal voltage e and the magnetic flux Φ passing through the generating coil 2. It shows. When the magnetic flux passing through the generating coil 2 changes as shown by the dashed line due to a change in the rotation angle θ of the inductor 12, the signal voltage generated from the generating coil 2 changes as shown by the solid line e. This signal voltage e is expressed by the following equation when the number of turns of the generator coil 2 is L.

e=-LdΦ/dt Either the positive or negative signal voltage shown in FIG. 5 is used as the ignition signal.

FIG. 4 is a diagram of the ignition signal generating coil viewed from the inductor side, and is shown as a cross section with a portion cut away to explain the situation in which the lead wire 16 for extracting the ignition signal is drawn out. The winding ends of the generator coil 2 are connected to the pair of terminals 9 shown in FIG.
is connected. This lead wire 16 is made of synthetic resin material 1
It passes through the hole 17 formed when casting 1 and is pulled out to the lower surface of the ignition signal generating coil, and is pulled out while being engaged with the pair of guide grooves 14 of the protrusion 15. Therefore, there is no need to provide a special part for locking the lead wire 16.

The ignition signal generator of this embodiment has the following effects.

(1) Since the structure is such that the coupling plate 6 is attached to the U-shaped vertical groove 5 of the winding frame 1 to fix the magnetic pole piece 4 and the magnet 3, the structure can be made compact and productivity can be improved. In addition, at this time, the elasticity of the coupling plate 6 is
Since the magnet 3 and the magnet 3 are brought into close contact with each other, magnetic loss is reduced and high performance is achieved.

(2) The ignition signal generating coil assembled as described above is covered almost entirely with mechanically strong and water-resistant synthetic resin, so it cannot be used in situations where it is exposed to water splashes, such as with outboard motors or snowmobiles. It has good insulation properties and has a long life.

(3) The ignition signal is extracted by connecting the external lead wire 16 to the terminal 9 exposed from the exterior sheathing material and pulling it out through a hole provided in the exterior sheathing material.
In addition, the groove 1 of the protrusion 15 formed of the exterior covering material
4, the lead wire 16 can be held securely and no special lead wire holder is required.

The ignition signal generating device of the present invention has the advantage of being small, lightweight, strong, highly reliable, and suitable for mass production.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of an ignition signal generating coil according to an embodiment of the present invention, FIGS. 2 and 3 are illustrations of an ignition signal generating device, and FIG. 4 shows an ignition signal generating coil connected to an inductor. FIG. 5, seen from the side, is a diagram showing the relationship between the rotation angle of the inductor and the ignition signal voltage. 1...Reeling frame, 2...Generating coil, 3...Magnet,
4...Magnetic pole piece, 5...Vertical groove, 6...Connection plate, 7...
...Mounting part, 8...Flange part, 9...Terminal, 10...Protrusion plate, 11...Synthetic resin material, 12
...Inductor, 13...Flywheel, 14...
Guide groove, 15... Protrusion, 16... Lead wire, 1
7...hole.

Claims (1)

[Claims] 1. An ignition signal generating device comprising an inductor that rotates in synchronization with the rotation of the engine, and a power generating coil device installed at a position close to and facing the inductor. It has two magnetic pole pieces each having a flat head, and a bobbin around which the above-mentioned power generation coil is wound.It has a flange portion at one end and a U-shaped vertical groove at the other end. A synthetic resin winding frame having holes for inserting the two magnetic pole pieces at positions separated from each other on the outside, and a magnetically coupled magnetically coupled frame to the back surface of the head of one of the magnetic pole pieces. It consists of a permanent magnet and a magnetic material arranged magnetically coupled to the back surface of the permanent magnet and the back surface of the head of the other magnetic pole piece, and is inserted into the vertical groove and the tips of both magnetic pole pieces are inserted into the hole. a coupling plate that protrudes a predetermined distance; a pair of metal terminals that are attached to the flange portion and to which both ends of the power generation coil are connected; tips of both magnetic pole pieces of the power generation coil device; the metal terminal; Provided along the device mounting part integral with the coupling plate and the flange part, covering the part other than the lead wire insertion hole leading to the lead wire attachment part of the metal terminal, and adjacent to the coupling plate. an exterior body made of a synthetic resin material and having a protrusion in which a pair of guide grooves for locking the lead wire are provided;
An ignition signal generating device comprising: a lead wire that passes from the guide groove through the lead wire insertion hole of the exterior body and is connected to the terminal.