JP2008136310A - Generator using iron core coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent contact failure in a ground conductor electrically connecting a coil for a generator using an iron core coil with an iron core, resulting from oscillation. <P>SOLUTION: The iron core coil is constituted by inserting an either projecting part 1a of the U-shape iron core 1 in a through hole 4a of a bobbin 4 around which an exciter coil 2 is wound so that earth of the coil may be connected to the iron core through the ground conductor 11. The ground conductor is brought into contact with the iron core, sandwiched between the iron core and the bobbin. The projection 12 which protrudes on the iron core side is provided at the ground conductor to bring the projection into contact with the iron core. The projection is brought into contact with the iron core by elastic return force of the bobbin, thus obtaining complete electrical connection of the ground conductor with the iron core. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a generator using an iron core coil in which a coil is wound around an iron core.

2. Description of the Related Art Conventionally, there is one that uses a magnet generator having an iron core coil for supplying electric power to a coil of an ignition device for an internal combustion engine (see, for example, Patent Document 1). In such a magnet generator, a magnet is fixed to the outer periphery of a flywheel integrated with the crankshaft, and fixed to the cylinder block by a magnetic flux change caused by the passage of the magnet rotating integrally with the flywheel. An electromotive force is generated in a coil wound around the iron core. Further, for fixing the iron core, it is screwed to the cylinder block as a simple and reliable one.
JP-A-11-303715

  As an example of a conventional iron core coil, as shown in FIG. 5, for example, an exciter coil (power generation coil) 22 and an ignition coil 23 (primary coil 23a / secondary coil 23b) are provided on an iron core 21 made of a U-shaped laminated steel plate. Some are arranged. In the figure, a solid line indicates the state before the iron core 21 and the coils 22 and 23 are attached, and the iron core 21 in the attached state with the coils 22 and 23 is indicated by a two-dot chain line. An iron core fixed to a cylinder block (not shown) by moving a magnet Mg fixed to, for example, the outer peripheral surface of a flywheel FW of an internal combustion engine as indicated by an arrow A in the figure as the flywheel FW rotates. In 21, the magnetic flux changes, thereby inducing a voltage in the exciter coil 22. The generated current is charged in a capacitor (for example, the capacitor in FIG. 2), a switch element (not shown) is conducted with a negative voltage generated in the exciter coil 22, a high voltage is generated in the secondary coil 23b, and a spark plug (see FIG. (Not shown). In this way, an ignition device using a magnet generator can be realized easily and at low cost.

  Further, in order to facilitate cost reduction in the coil ground connection structure, there is one in which the ground side of the coil is electrically connected to the iron core via a grounding conductor. However, there is a risk that rattling occurs between the iron core and the coil due to vibration during operation, and the grounding conductor is also affected. Therefore, it is necessary to take measures against backlash in attaching the grounding conductor, and various structures have been proposed.

  In the illustrated example, the coils 22 and 23 are arranged in the housing 26 together with the corresponding cylindrical bobbins 24 and 25, the inside of the housing 26 is filled with a resin material, and the members are integrated, and then the iron core 21 is integrated. Are inserted and attached to the coils 22 and 23 (bobbins 24 and 25) as indicated by the arrow B in the figure. Further, the grounding conductor 27 is molded and fixed with a resin material in a state in which one end thereof is connected to the corresponding terminal of the coils 22 and 23, and the other end is as shown by a solid line in the figure. It protrudes outward (upward in the figure).

  And the protrusion part of the conductor 27 for earth | ground was bent toward the hole of the bobbin 24 as shown by the arrow C of a figure, and when the iron core 21 was inserted in the bobbin 24, it provided in the corner | angular part of the iron core 21 at the bending shape. The concave portion 21 a is bent and pressed in a curved shape, and the ground conductor 27 is sandwiched between the iron core 21 and the bobbin 24 in the attached state and fixed. As a result, the grounding conductor 27 is connected to the iron core 21.

  However, even in this structure, there is a risk that the grounding conductor may be worn by sliding against the iron core due to vibration during operation, and as the wear progresses, a problem of poor contact occurs. Also, if the bobbin is made of synthetic resin for a highly rigid iron core, the contact force against the iron core of the earth conductor will be obtained by the repulsive force of the elastic deformation, but the finished accuracy of the molded product made of synthetic resin There is a problem that the variation of the contact pressure increases due to the variation of the quality and the quality becomes unstable. Although the processing accuracy of the molded product can be increased, the cost is increased.

  Further, when filling the housing with a synthetic resin material, it can be performed by vacuum casting, but soldering or a conductive adhesive is used to connect one end of the grounding conductor to the coil in advance. In other words, there is a problem of high cost. In addition, when connecting the grounding conductor and the coil outside where the synthetic resin material is filled, since the connecting portion is not molded, there is a risk of poor conduction due to vibration due to driving or corrosion due to exposure to air. .

  In order to solve such a problem and to realize that the grounding conductor that electrically connects the coil of the generator using the iron core coil and the iron core is prevented from being poor in contact due to vibration, the present invention is implemented. A generator using an iron core coil in which a coil is wound around an iron core and an alternating magnetic flux is generated in the iron core to generate electric power by an electromotive force generated in the coil. And a bobbin made of an elastic body attached to the iron core, and a grounding conductor for electrically connecting one end of the coil and the iron core, wherein the grounding conductor is formed between the bobbin and the iron core. The projection is formed so as to come into contact with the iron core while being sandwiched by the restoring force of elastic deformation of the bobbin therebetween.

  In particular, a housing integrally formed with a part of the iron core is received, and the coil, the bobbin, and the grounding conductor are received in the housing and fixed by a synthetic resin material filled in the housing. Good to be. Further, it is preferable that a housing integrally formed with a part of the iron core is provided, and a substrate on which the grounding conductor is soldered is mounted in the housing.

  As described above, according to the present invention, the grounding conductor for grounding the coil is attached in a state of being sandwiched between the iron core and the bobbin, and the protrusion that contacts the iron core in this state is formed on the grounding conductor. Since the protrusion comes into contact with the iron core due to the elastic restoring force of the bobbin, a reliable electrical connection of the grounding conductor to the iron core can be obtained.

  In particular, a housing integrally formed with the iron core is provided, and a grounding conductor is sandwiched between the iron core and the bobbin in the housing and molded by, for example, molding with a synthetic resin material (for example, epoxy resin). Accordingly, it is possible to suppress the occurrence of rattling between the grounding conductor and the iron core due to the fact that the grounding conductor is less likely to shake due to vibration due to the curing of the synthetic resin material. In addition, since the grounding conductor is integrated with the substrate in a state where the grounding conductor is sandwiched between the iron core and the bobbin and soldered to the substrate, the same effects as described above can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a main part of a magnet generator to which the present invention is applied, broken away. A magnet Mg is fixed to, for example, the outer peripheral surface of a flywheel FW of an internal combustion engine (not shown), and the magnet Mg moves as indicated by an arrow A in the figure as the flywheel FW rotates.

  In the magnet generator, an exciter (power generation) coil 2 is wound around a substantially U-shaped iron core 1 that is reversed in the figure formed of laminated steel sheets, and one protruding portion 1a of the U-shape of the iron core 1, The primary side coil 3a and the secondary side coil 3b which comprise the ignition coil 3 are wound by the other protrusion part 1b. The coils 2 and 3 are wound around the rectangular cylindrical bobbins 4 and 5, respectively, and the protruding portions 1a and 1b corresponding to the through holes 4a and 5a of the bobbins 4 and 5 are inserted, The coils 2 and 3 are attached to the iron core 1.

  Further, a housing 6, which may be made of a synthetic resin, is fixed to a root portion (portion between both protruding portions 1 a and 1 b) of the U-shape of the iron core 1 by integral molding. The housing 6 is formed in a bowl shape that surrounds the coils 2 and 3 wound around the protruding portions 1 a and 1 b of the iron core 1. The protruding portion 1b to which the ignition coil bobbin 5 is attached is covered with a shape in which a part of the housing 6 is formed into a boss shape. The primary coil 3a is wound around the inside of the bobbin 5 (the inner peripheral surface of the through hole 5a), and the secondary coil 3b is wound around the outside of the bobbin 5, whereby the primary side This is to ensure insulation of the coil 3a from the iron core 1.

  A plurality of (two in the illustrated example) mounting holes 7 for fixing screws are provided at appropriate positions of the iron core 1, and a cylinder block (not shown) is used by using screws (not shown) inserted through the mounting holes 7. The iron core 1 is fixed.

  An outline of the electric circuit of the magnet generator thus configured is shown in FIG. The circuit shown in the figure is a known internal trigger CDI circuit, and a detailed description of the CDI circuit is omitted. In the figure, a printed circuit board 8 on which a capacitor, a diode, a thyristor, and the like are mounted is provided between the exciter coil 2 and the primary coil 3a. A spark plug 9 is connected to the output terminal of the secondary coil 3b.

  In the above circuit, the ground side is combined into one and connected to the ground conductor 11 of the present invention. As shown in FIGS. 1 and 4, the grounding conductor 11 is formed by bending a plate-like conductor so as to have an inverted L-shaped cross-sectional shape in the drawing. An L-shaped long side portion 11a of the grounding conductor 11 is sandwiched in the thickness direction between the protruding portion 1a of the iron piece 1 and the exciter coil bobbin 4 in the attached state. As a result, the grounding conductor 11 is connected to the cylinder block via the iron core 1 and is in a body grounded state.

  As shown in FIGS. 3 and 4, the grounding conductor 11 is a long side portion 11 a sandwiched between the iron core 1 (1 a) and the bobbin 4, and the iron core 1 (1 a A plurality of protrusions 12 are provided so as to protrude to the side. In the formation of the protrusion 12, for example, a semi-circular cut is made, and the protruding side of the semi-circular part is half-extruded so as to extrude a predetermined amount, and the arc-shaped side protrudes with the semi-circular diameter part as a fold. Can be. As a result, in a state where the iron core 1 (1a) and the bobbin 4 are sandwiched, the protrusion 12 can come into contact with the iron core 1 (1a), so that the ground conductor 11 and the iron core 1 (1a) can be reliably contacted. It becomes.

  Further, by forming the bobbin 4 from a synthetic resin material, a certain amount of elastic deformation is possible, and the grounding conductor 11 (long side portion 11a) can be spring-pressed by a restoring force due to the elastic deformation in the clamping state. Even if the ratchet is likely to occur between the iron core 1 and the bobbin 4 during assembly, the restoring force ensures the contact state.

  In addition, the positioning hole 11b is provided in the short side portion of the grounding conductor 11, the corresponding protrusion 4b is provided in the bobbin 4, and the protrusion 4b is inserted into the positioning hole 11b. Thus, the grounding conductor 11 is positioned. Further, the projecting end side of the short side portion of the grounding conductor 11 is bent to the side of the substrate 8 that will be located in the attached state, and is soldered to a through hole 8 a provided in the substrate 8. .

  In attaching the grounding conductor 11, for example, the long side portion 11a is inserted into the through hole 4a of the bobbin 4, and the grounding conductor 11 is connected to the bobbin 4 by the engagement between the protrusion 4b and the positioning hole 11b. And the grounding conductor 11 in this state is soldered to the substrate 8. Further, the connection end portions of the coils 2 and 3 are soldered to corresponding through holes (not shown) of the substrate 8. As a result, the coils 2 and 3 (bobbins 4 and 5), the substrate 8, and the grounding conductor 11 are integrated, and the protruding portions 1a and 5a of the iron core 1 are inserted into the through holes 4a and 5a of the bobbins 4 and 5 in this state. 1b is inserted as shown by the arrow B in FIG. 3, and the coils 2 and 3 (bobbins 4 and 5), the substrate 8, and the grounding conductor 11 are mounted in a state of being received by the housing 6 (FIG. 1).

  At this time, since the grounding conductor 11 is positioned with respect to the bobbin 4, the grounding conductor 11 can be easily and reliably inserted into the iron core 1 (1a) and the bobbin 4 (through hole 4a) simultaneously with the insertion of the protruding portion 1a. (Inner peripheral surface). Further, by tilting the shape of the protrusion 12 provided on the grounding conductor 11 in the direction of lying down with respect to the insertion direction of the iron core 1 (1a) as shown in FIGS. 3 and 4, the iron core 1 (1a) Therefore, there is no great resistance in the insertion work, and the insertion work is not hindered.

  And even if it is a case where it carries out by vacuum casting when providing a synthetic resin material (for example, epoxy resin) in the housing 6 in the traffic jam as in the prior art, the grounding conductor 11 is high due to the protrusion 12. Since the contact pressure is secured, there is no problem of poor contact. Further, the portion of the protrusion 12 that is in contact with the iron core 1 (1a) is provided with the synthetic resin material 13 filled in the housing 6 as shown in FIG. Since the contact state is secured by this, the protrusion 12 is not worn, and the contact failure between the protrusion 12 and the iron core 1 (1a) does not occur.

  The generator using the iron core coil according to the present invention can prevent poor contact due to the backlash of the grounding conductor connecting the coil and the iron core even when used in an internal combustion engine in which vibration is unavoidable. It is useful as an ignition device composed of a generator using the.

It is a front view which fractures | ruptures and shows the principal part of the magnet generator to which this invention was applied. It is a schematic circuit diagram of a magnet generator. It is a principal part fracture | rupture front view which shows the disassembly / assembly point of a magnet generator. It is a perspective view which shows the disassembly / assembly point of a magnet generator. It is a principal part fracture | rupture front view which shows the disassembly / assembly point of the conventional magnet generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Iron core, 1a, 1b Protruding part 2 Exciter coil 3 Ignition coil 4/5 Bobbin 6 Housing 8 Printed circuit board 11 Grounding conductor 12 Protrusion

Claims (3)

A generator using an iron core coil wound around an iron core and generating power by an electromotive force generated in the coil by generating an alternating magnetic flux in the iron core,
A bobbin made of an elastic body around which the coil is wound and attached to the iron core; and a grounding conductor for electrically connecting one end of the coil and the iron core;
The grounding conductor is sandwiched between the bobbin and the iron core by a restoring force of elastic deformation of the bobbin, and has a protrusion formed so as to come into contact with the iron core in the sandwiched state. A generator using an iron core coil characterized by that. A housing integrally formed with a part of the iron core;
The core coil according to claim 1, wherein the coil, the bobbin, and the grounding conductor are received in the housing and fixed by a synthetic resin material filled in the housing. Generator. A housing integrally formed with a part of the iron core;
2. A generator using an iron core coil according to claim 1, wherein a substrate on which the grounding conductor is soldered is mounted in the housing.

Images