JP4169289B2 - Magnet generator ignition device for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnet generator ignition device for an internal combustion engine used as a prime mover of a working machine such as a chain saw or a mower.
[0002]
[Prior art]
Conventionally provided work machines such as chain saws and mowers generally use an internal combustion engine as a prime mover, and a magnet generator for generating ignition energy is mounted to continuously operate the internal combustion engine.
[0003]
FIG. 3 is an electric circuit diagram showing an ignition device for an internal combustion engine having such a magnet generator. Briefly describing this figure, a rotor 1 in which magnets are embedded rotates in synchronization with the internal combustion engine, thereby inducing a positive voltage in the power generating coil 2. The capacitor 3 is charged with the positive voltage at the timing of inducing the positive voltage.
[0004]
On the other hand, when the generator coil 2 induces a negative voltage, at the timing of inducing the negative voltage, the thyristor 4 as a switch element is made conductive by turning on the gate thereof, and the charging voltage of the capacitor 3 is changed to the primary voltage of the ignition coil 5. Supply to coil. For this reason, a high voltage is induced in the secondary coil of the ignition coil 5, and an ignition spark is generated in the spark plug 6 connected to the secondary coil due to the high voltage discharge, thereby igniting the fuel in the cylinder. To make the internal combustion engine operational. In this figure, 7, 8, 9, 10 are diodes, 11 is a resistor, and 12 is an ignition stop switch.
[0005]
By the way, the said magnet generator is comprised from the said rotor 1 and the coil core 12 as shown in FIG. The coil core 12 is U-shaped, and the power generating coil 2 is wound around one leg 12a. Therefore, a corresponding gap G is formed between the power generating coil 2 and the other leg 12b of the coil core 12. Is provided. The gap G is not large enough to accommodate the ignition coil 5, so that the ignition coil 5 is provided at a position independent of the coil core 12 as shown in FIG. A relatively small electronic component module, capacitor 3 and the like constituting the ignition control circuit are accommodated in the gap G.
[0006]
[Problems to be solved by the invention]
However, in such a magnet generator ignition device for an internal combustion engine, since the ignition coil 5 is provided offset from the center line of the coil core 12, this coil assembly B is shown in FIG. When mounting to the mounting boss 14 at the center of the cylinder 13 of the internal combustion engine as shown, a part or all of the ignition coil 5 protrudes from the width of the cylinder 13 by a length L, and the magnet generator For a working machine such as a chain saw having the above, there is a problem that it is not preferable in terms of design and size reduction.
[0007]
The present invention solves the above-described problems, and can improve the design of the magnet generator and the working machine having the magnet generator while reducing the size of the magnet generator. On the other hand, the magnet generator ignition device for an internal combustion engine can be mounted so as to be within the width of the internal combustion engine and can be further reduced in size as described above, so that the efficiency of engine cooling can be improved. The purpose is to obtain.
[0008]
[Means for Solving the Problems]
To achieve the above object, a magnet generator ignition device for an internal combustion engine according to the present invention has a U-shaped coil core disposed so as to face a rotor with a magnet driven in synchronization with the rotation of the internal combustion engine, A coil that constitutes a magnet generator together with the rotor is wound around one leg of the coil core, and an ignition coil that generates an ignition voltage using the generated voltage of the generator coil is formed on the other leg of the coil core. A coil assembly in which the ignition coil and the power generation coil are integrated with the coil core is wound so that the center line of the coil assembly substantially coincides with the center line of the cylinder of the internal combustion engine, and to fit within the width of the cylinder, it is mounted on a mounting boss of the cylinder outer surface, each other two legs of the generating coil and the ignition coil coil core Gyakuhai A configurable is.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a coil assembly B1 in a magnet generator for an internal combustion engine of the present invention. In FIG. 1, reference numeral 12 denotes a U-shaped coil core having a pair of legs 12a and 12b. The ignition coil 5A is wound around.
[0011]
The power generating coil 2 is wound around the other leg 12 b of the coil core 12. For this reason, in the gap G between the ignition coil 5A and the other leg 12b, approximately half of the thickness of the power generating coil 2 is accommodated, and as a result, the power generating coil 2 is only half that thick. It only protrudes to the outside of the coil core 12 and does not protrude greatly from the width of the coil core 12. Therefore, the overall shape of the coil assembly B1 can be reduced.
[0012]
Therefore, the coil assembly B1 in which the ignition coil 5A and the power generation coil 2 wound around the both legs 12a and 12b of the coil core 12 are integrated as described above, and the center line of the coil assembly B1 is the center of the cylinder 13 of the internal combustion engine. When mounted on the cylinder 13 so as to substantially match the line, the coil assembly B1 can be accommodated within the width of the cylinder 13 as shown in FIG. For this reason, the design of the mounting structure in the cylinder 13 of the coil assembly B1 can be improved, and the design of attaching the mounting boss to the internal combustion engine is also very easy.
[0013]
Even if the arrangement of the ignition coil 5A and the power generation coil 2 with respect to the legs 12a and 12b in the coil core 12 is reversed, the original functions of the ignition coil 5A and the power generation coil 2 are not impaired at all. When the mounting position of the coil core 12 with respect to the cylinder 13 is fixed, the two coils 2 and 5A can be reversed by reversing the arrangement as described above according to the size and shape of the ignition coil 5A and the power generation coil 2. Can be easily accommodated within the width of the cylinder. In this case, since the ignition coil 5A can be made relatively large (large cross-sectional area) with respect to the power generation coil 5A, there is an advantage that larger ignition energy can be obtained compared to the conventional case. In other words , the ignition coil 5A embodies two effects of downsizing the configuration of the coil assembly B1 including the power generation coil 2 as compared with the prior art and generating large ignition energy.
[0014]
【The invention's effect】
As described above, according to the present invention, the U-shaped coil core is disposed so as to face the rotor with magnets driven in synchronization with the rotation of the internal combustion engine, and the rotor is mounted on one leg of the coil core. A power generation coil that constitutes a magnet generator is wound, and an ignition coil that generates an ignition voltage using the power generation voltage of the power generation coil is wound around the other leg of the coil core. A coil assembly in which a coil is integrated with the coil core, the outer surface of the cylinder so that the center line of the coil assembly substantially coincides with the center line of the cylinder of the internal combustion engine and falls within the width of the cylinder Since the magnet generator and the work machine having the magnet generator can be reduced in size, the design can be improved and the coil assembly can be improved. To Da, the effect is obtained that can be attached to fit this in width.
In addition, when the coil core mounting position with respect to the cylinder is fixed, the arrangement of the coils is reversed as described above according to the size and shape of the ignition coil and the power generation coil, so that both coils are It becomes easier to fit inside. In this case, since the ignition coil can be made relatively large (large cross-sectional area) with respect to the power generation coil, there is an advantage that larger ignition energy can be obtained compared to the conventional case.
[Brief description of the drawings]
FIG. 1 is a front view of a main part showing a magnet generator ignition device for an internal combustion engine according to an embodiment of the present invention.
2 is a conceptual diagram showing a structure for mounting a magnet generator type ignition device for an internal combustion engine shown in FIG. 1 to a cylinder;
FIG. 3 is a circuit diagram showing a general ignition control device of a conventional internal combustion engine.
FIG. 4 is a front view showing a conventional magnet generator ignition device for an internal combustion engine.
5 is a conceptual diagram showing a mounting structure of a magnet generator type ignition device for an internal combustion engine shown in FIG. 4 to a cylinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor 2 Generator coil 5A Ignition coil 12 Coil core 12a, 12b Leg

Claims (1)

A U-shaped coil core disposed so as to face a rotor with magnets driven in synchronization with the rotation of the internal combustion engine, and wound around one leg of the coil core to constitute a magnet generator together with the rotor A power generation coil, and an ignition coil wound around the other leg of the coil core and generating an ignition voltage using the power generation voltage of the power generation coil, and the ignition coil and the power generation coil are integrated with the coil core A coil assembly is mounted on the mounting boss on the outer surface of the cylinder so that the center line of the coil assembly substantially coincides with the center line of the cylinder of the internal combustion engine and is within the width dimension of the cylinder. Do Ri, the power generation coil and the ignition coil for an internal combustion engine magnet generator type ignition system, which is a possible opposite each other on the two legs of the coil core.

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