JP2011071246A - Ignition coil device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems, wherein since a diode for suppressing an On-voltage generated in a secondary coil, when energizing is started, is disposed on the substrate of an ignitor, the ignitor or the substrate is enlarged, as a result, there is the possibility of closing the upper part of a coil case, injection of an epoxy resin into the coil case is obstructed, a resin injection amount increases, and weight is increased. <P>SOLUTION: The diode is mounted around the bobbin of a primary coil and connected with primary and secondary coiling ends and a power supply terminal. Specifically, the diode is attached to a space between the inner side of the inner diameter of the coil case and the outer side of a primary bobbin. Furthermore, it is arranged so as not to overlap with the ignitor, when it is projected from above. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a so-called independent ignition type in which an elongated cylindrical ignition coil portion in which a primary coil and a secondary coil are arranged around a rod-shaped center core is attached to a plug hole of an internal combustion engine and directly connected to each ignition plug. The present invention relates to an ignition coil device for an internal combustion engine. In particular, the present invention relates to this type of ignition coil device in which an igniter (ignition control circuit) is mounted on the upper part of the ignition coil unit.

  In this type of ignition coil device, when energization of the primary coil is started, a voltage is induced in the secondary coil, and the ignition plug may be erroneously ignited. For this reason, when energization to the primary coil is started, a voltage is not induced in the secondary coil, so that the voltage is not induced between the low-voltage side winding end of the secondary coil and the power line, or the low-voltage side winding end of the secondary coil. A Zener diode or a diode is connected between one end and the low-voltage side winding end of the primary coil so that the power line or the low-voltage side winding end of the primary coil is the cathode.

  Conventionally, this diode is arranged on the substrate of an igniter as disclosed in Patent Document 1, for example.

JP 2002-260936 A

  The conventional independent ignition type ignition coil device configured as described above has a problem that the substrate for the igniter becomes large and the resin injection opening of the coil case portion is blocked.

  An object of the present invention is to make the igniter substrate small so that the resin injection opening of the coil case of the ignition coil is not narrowed.

  In order to achieve the above object, in the present invention, a cathode-side lead electrically connected to the power supply terminal of the connector provided in the igniter case or the winding end of the primary coil, and the winding end of the secondary coil, A diode or a Zener diode having an anode-side lead to be electrically connected is held inside the igniter case on the radially outer side of the primary coil bobbin.

  A diode or a Zener diode is preferably mounted in the space between the coil case and the primary coil bobbin.

  Preferably, a protrusion is provided on the igniter case, and a cathode side lead and an anode side lead are held on the protrusion.

  Preferably, the primary winding end is connected to the cathode side lead, and the secondary winding end is entangled with the anode side lead.

  Preferably, a noise killer capacitor is held between the power supply terminal and the ground terminal of the connector portion.

  Preferably, the diode or the Zener diode is mounted at a position closer to the coil portion than the circuit board mounting position.

  Preferably, the diode or the Zener diode is mounted between the outer periphery of the primary bobbin around which the primary coil is wound and the inner periphery of the coil case.

  The power supply terminal of the connector and the primary winding end may be connected by a relay terminal.

  The power supply terminal of the connector and the secondary winding end may be connected by a relay terminal.

  Thus, according to the present invention configured as described above, the diode can be separated from the igniter, the igniter or the igniter mounting substrate can be made small, and the igniter or the igniter mounting substrate covers the upper opening of the coil case. As a result, the resin flow was smooth.

1 is a cross-sectional view of an internal combustion engine ignition coil according to a first embodiment of the present invention. The top view of the ignition coil for internal combustion engines which is the 1st Embodiment of this invention. The circuit block diagram of the ignition coil for internal combustion engines which is the 1st Embodiment of this invention. The principal part sectional drawing of the ignition coil for internal combustion engines which is the 2nd Embodiment of this invention. The top view of the ignition coil for internal combustion engines which is the 2nd Embodiment of this invention. The diode shape figure which is the 2nd Embodiment of this invention. Sectional drawing of the principal part of the ignition coil for internal combustion engines which is the 3rd Embodiment of this invention. The detail drawing of the groove | channel for guidance which is the 3rd Embodiment of this invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

The primary bobbin 2 is formed of a thermoplastic synthetic resin such as polybutylene terephthalate (PBT) or polyphenylene sulfide (PPS), and the primary coil 3 is wound thereon. The primary coil 3 is formed by laminating and winding an enameled wire having a wire diameter of about 0.5 to 0.7 mm several tens of times per layer, about 150 to 250 times in total over several layers.

  The secondary bobbin 4 is formed of a thermoplastic synthetic resin such as modified polyphenylene oxide (modified PPO) or polyphenylene sulfide (PPS), and a secondary coil 5 is wound thereon.

  The secondary coil 5 is an enameled wire having a wire diameter of about Φ0.03 to 0.05 mm and is divided and wound about 15000 to 25000 times. Further, a power source side primary terminal 6 and a collector side primary terminal 7 are fixed to the low pressure side of the secondary bobbin 4. The power source side primary terminal 6 is connected to the cathode side lead 17a of the diode 17 for suppressing the On voltage generated in the secondary coil at the start of energization, and the other anode side lead 17b of the diode 7 and the secondary coil 5 are connected by welding or the like. To do. Ita spring 18 is fixed to the high-voltage side opposite to the low-voltage axis, and the high voltage boosted by secondary coil 5 is connected to spark plug (not shown) via high-voltage terminal 19 and spring 20. Yes.

  The center core 8 is laminated in a multi-stage shape by changing the press width of a silicon steel plate having a thickness of 0.2 to 0.7 mm to improve the space factor with respect to the inner diameter of the secondary bobbin 4. It is arranged.

  One or both ends of the center core 8 are provided with magnets 9 that generate a magnetic flux in a direction opposite to the magnetic flux generated by the primary coil 3. Since the magnetic flux generated by the magnet 9 gives a negative magnetic flux to the center core 8 and can be used from the negative side of the core magnetization curve to the positive side, it is the same as using a core material having an apparently high saturation magnetic flux density. As a result, high output of the coil can be expected.

  Between the center core 8 and the magnet 9 and the secondary bobbin 4, an elastic insulating material 10 such as a flexible epoxy resin or silicon rubber is cast and cured.

  The cylindrical coil case 11 is formed of a thermoplastic synthetic resin similar to the primary bobbin 2 and holds the side core 12.

  The side cores 12 are formed by rolling 1-3 silicon steel plates having a thickness of 0.2 to 0.7 mm into a tubular shape. However, in order to prevent a short turn of the magnetic flux, at least one place on the circumference of the side core 12 is provided with a cut.

  The igniter case 13 at the upper part of the coil is also formed of the same thermoplastic synthetic resin as the primary bobbin 2, and the igniter case 13 is provided with an igniter 14 that cuts off the current to the primary coil 3, and the coil case 11 and the igniter. An epoxy resin 15, which is an insulating thermosetting synthetic resin, is cast and cured inside the case 13, and then the igniter case 13 is covered with a decorative cover 16 made of a thermoplastic synthetic resin to cover the ignition coil 1. Forming.

  The substrate 14A of the igniter 14 is fixed at a position shifted from the center of the coil case to the right side in FIG. The diode 17 is disposed on the side surface (outer peripheral portion) of the coil case.

  At this time, the diode 17 is closer to the coil case side than the position where the board 14A is fixed, that is, attached to the lower side of the board.

  The cathode lead 17a of the diode 17 is connected to the relay terminal 6 at the cathode lead connecting portion 17c. Together with the primary coil winding end portion 3A, the primary winding end binding portion 3a is entangled with the relay terminal 6.

  The anode side lead 17b of the diode 17 is entangled with the secondary coil winding end 5A at the anode side lead connecting portion 17d of the diode to form the secondary winding end linking portion 5a.

  The primary coil winding end 3 </ b> A, the cathode side lead 17 a and the power supply terminal 100 a are connected by the relay terminal 6.

  Since the primary coil winding end 3A, the power supply terminal 100a, and the relay terminal 6 are all the same in potential, the cathode lead 17a of the diode may be connected to any of these three members. As a result, the relay terminal 6 to which the cathode side lead 17a of the diode 17 is connected functions as a primary coil winding terminal.

  In the first embodiment shown in FIGS. 1 to 3, the cathode-side lead 17a of the diode 17 is connected to the primary winding end portion 3a (primary coil winding end connecting portion) where the primary coil winding terminal portion 3A is entangled. 6A) is fixed to the relay terminal 6 on the power source side. The anode-side lead 17b is sandwiched and fixed by 13a formed by a small projection groove provided in the igniter case 13 (see FIG. 8), and the secondary coil winding end portion 5A is provided on the anode-side lead 17b. It is entwined. As a result, the anode-side lead 17b of the diode 17 functions as a secondary coil connection terminal that binds the secondary coil winding end 5A.

  As a result, the power supply side winding end of the primary coil 3 and the power supply side winding end of the secondary coil 5 are electrically connected via the diode 17 connected in the opposite direction when viewed from the primary coil side. Yes.

  Further, when viewed in the radial direction, the diode 17 is located between the outer periphery of the primary bobbin 2 and the inner periphery of the upper end (low voltage side end) of the coil case, and the periphery is covered with the injected resin.

  Thus, since the diode 17 can be mounted in the igniter case 13 separately from the igniter, the igniter 14 itself can be reduced in size, and the igniter case 13 for housing the igniter 14 is also reduced, resulting in the injection amount of the epoxy resin 15. It is also possible to reduce the size and weight. Since the igniter 14 itself can be reduced in size, a resin injection opening to the coil portion can be secured, so that the flow of the insulating resin flowing around the coil can be smoothly injected without being restricted by the substrate.

  Furthermore, by disposing the diode between the igniter and the secondary coil so as not to overlap the igniter when projected from the upper surface, an area that has been a dead space can be effectively used.

  A noise killer (noise removal) capacitor 100a is mounted between the ground terminal 200G of the connector 200 and the power supply terminal 100c.

  One side lead 100b of the noise killer (noise elimination) capacitor 100a is inserted into the power supply terminal 100c or fixed by winding, welding or soldering, and the other lead 100d is inserted by the ground terminal 200G or fixed by winding, welding or soldering. ing.

  In the embodiment fixed in this way, the dead space in the igniter case 13 is effectively used, and a noise killer (noise removal) capacitor 100a is also built in and can be molded with an insulating resin.

  A second embodiment will be described with reference to FIGS.

  In FIG. 4, by arranging the cathode side lead 17 a and the anode side 17 b of the diode 17 by being bent at a plurality of positions, the stress generated in the diode 17 when a thermal shock is input can be reduced.

  In addition, as shown in FIG. 5, the cathode-side lead connecting portion 17c and the anode-side lead connecting portion 17d of the diode are not set in the same direction, so that the degree of freedom in the position of the connecting portion increases.

  FIG. 6 shows a diode shape. The functions of each cathode side lead 17a and anode side lead 17b are as described above.

  A third embodiment will be described with reference to FIGS.

  In FIG. 7, the diode 17 is arranged on the igniter case 13 side, connected to the cathode side lead 17a of the diode 17 and the power supply terminal (21, 100c) of the connector, and the anode side lead 17b of the diode 17 and the secondary coil 5 are connected. Connect to the relay terminal 22 to which the winding end is connected. As shown in FIG. 8, since the cathode side lead 17a and the anode side lead 17b are pushed into the lead guide groove 13a in the igniter case 13 and guided to each of the diodes 17, the lead and winding, lead and terminal welding, etc. During the connection operation, the position of the diode 17 is stabilized, so that quality can be easily stabilized during manufacture.

  The embodiment described above has the following characteristic configuration.

  A cathode-side lead (17a) electrically connected to the power terminal (21, 100a) of the connector (200) or the winding end (3A) of the primary coil (3) provided in the igniter case (13); A diode or a Zener diode (17) having an anode side lead (17b) electrically connected to the winding end (5A) of the secondary coil (5) is disposed radially outside the primary coil bobbin (2). The igniter case (13) was held inside.

  A diode or a Zener diode (17) is preferably mounted in the space between the coil case (11) and the primary coil bobbin (2).

  Preferably, the igniter case (13) is provided with protrusions (13A, 13B), and the cathode side lead (17a) and the anode side lead (17b) are sandwiched between the guide grooves (13a) provided in the protrusions (13A, 13B). Hold on.

  Preferably, the winding end (3A) of the primary coil is connected to the cathode side lead (17a), and the winding end (5A) of the secondary coil is entangled with the anode side lead (17b).

  Preferably, a noise killer (removal of old age) capacitor (100a) is held between the power supply terminal (21, 100a) and the ground terminal (100G) of the connector (200).

  Preferably, the diode or the Zener diode (17) is mounted at a position closer to the coil portion (2, 3, 4, 5, & 8, etc.) than the position where the circuit board (14A) is attached (below the circuit board (14A)). .

  Preferably, the diode or the Zener diode (17) is mounted between the outer periphery of the primary bobbin (2) around which the primary coil (3) is wound and the inner periphery of the coil case (11).

The power terminal (21, 100a) of the connector (200) and the winding end of the primary coil may be connected by a relay terminal (6, 6a).
The power terminal (21, 100a) of the connector (200) and the winding end (5A) of the secondary coil may be connected by a relay terminal (22, 22A). In this case, the secondary coil (5) winding end (5A) is bound (5a) to the connection piece (22A) of the relay terminal (2).

  By comprising in this way, it becomes possible to provide the ignition coil for internal combustion engines with which size and weight reduction and manufacture quality were stabilized.

  Further, since the igniter can be reduced in size and the igniter case for accommodating the igniter does not need to be enlarged, as a result, the injection amount of epoxy resin can be reduced, the weight can be reduced, and the size and weight can be reduced.

  In addition, by arranging the diode between the igniter and the secondary coil so as not to overlap the igniter when projected from the upper surface, an area that has been a dead space can be effectively used. As a result, an ignition coil device for an internal combustion engine that can be reduced in size and weight can be obtained.

  If a noise killer (noise removal) capacitor is also built in, the dead space can be used more effectively.

DESCRIPTION OF SYMBOLS 1 Ignition coil 2 Primary bobbin 3 Primary coil 3A Primary coil winding end part 3a Primary winding end part binding part 4 Secondary bobbin 5 Secondary coil 5A Secondary coil winding end part 5a Secondary winding end part binding Part 6 Relay terminal (between primary coil winding end and power supply terminal)
6A Primary coil winding end connection portion 6a Cathode connection portion 7 Collector side primary coil terminal 8 Center core 9 Magnet 10 Elastic insulating material 11 Coil case 12 Side core 13 Igniter case 13a Guide groove 13A, B Protrusion 14 Igniter 14A Substrate 15 Epoxy resin 16 Cover 17 Diode 17a Cathode side lead 17b Anode side lead 17c Cathode side lead connection part 17d Anode side lead connection part 18 Leaf spring 19 High voltage terminal 20 Spring 21 Power supply terminal 22 Relay terminal (between secondary coil winding end and power supply terminal )
22A Secondary coil winding end connection piece 100a Noise killer capacitor 100c Power supply terminal 100G Ground terminal

Claims (15)

An independent ignition type ignition coil device for an internal combustion engine in which an elongated cylindrical ignition coil portion in which a primary coil and a secondary coil are arranged around a rod-shaped center core is mounted in a plug hole of the internal combustion engine and directly connected to each ignition plug In the above, an igniter case part to which an igniter (ignition control circuit) is mounted on the upper part of the ignition coil part,
A cathode-side lead electrically connected to the power terminal of the connector provided in the igniter case or the winding end of the primary coil; and an anode-side lead electrically connected to the winding end of the secondary coil; An ignition coil device for an internal combustion engine configured to hold a diode or a chenner diode in the igniter case outside the primary coil bobbin in the radial direction. In claim 1,
An ignition coil device for an internal combustion engine, wherein the diode or the Zener diode is mounted in a space between the coil case and the primary coil bobbin. In one of claims 1 and 2,
An ignition coil device for an internal combustion engine, wherein a projection is provided on the igniter case, and a cathode side lead and an anode side lead are held on the projection. In any one of claims 1 to 3,
An ignition coil device for an internal combustion engine, wherein the primary winding end is connected to the cathode side lead, and the secondary winding end is entangled with the anode side lead. In any one of claims 1 to 4,
An internal combustion engine ignition coil device configured to hold a noise killer capacitor between a power supply terminal and a ground terminal of the connector portion.
Preferably, the diode or the Zener diode is mounted at a position closer to the coil portion than the circuit board mounting position. In what is described in claim 2,
The internal combustion engine ignition coil device is mounted between the outer periphery of the primary bobbin around which the primary coil is wound and the inner periphery of the coil case. In claim 1,
An ignition coil device for an internal combustion engine, wherein the power supply terminal of the connector and the primary winding end are connected by a relay terminal. In claim 1,
An ignition coil device for an internal combustion engine, wherein a power terminal of the connector and the end of the secondary winding are connected by a relay terminal.   In the ignition coil device for an internal combustion engine of an independent ignition type that is inserted into the plug hole of each cylinder of the internal combustion engine and directly connected to the ignition plug, an igniter that cuts off the primary current is arranged at the upper part of the plug hole, and the high voltage The coil portion for generating the coil is disposed in the plug hole, and the coil portion is disposed in the radial direction with the center core and side core constituting the magnetic circuit, the primary bobbin, the primary coil, the secondary bobbin, the secondary coil, and the coil case. A power supply side primary terminal and a collector side primary terminal fixed by press-fitting or bonding with the secondary bobbin are arranged, and a diode for suppressing the On voltage generated in the secondary coil at the start of energization is arranged between the igniter and the secondary coil. An ignition coil device for an internal combustion engine, wherein the diode does not overlap the igniter when projected from above.   The ignition coil device for an internal combustion engine according to claim 9, wherein the diode has a cathode side lead connected to a power source side primary terminal and an anode side lead connected to a secondary coil. The ignition coil device for an internal combustion engine according to claim 10, wherein the connection between both leads of the diode and the primary terminal or secondary coil on the power source side is welded, heat squeezed, or soldered. What is described in claim 10 or claim 11,
An ignition coil device for an internal combustion engine, wherein a plurality of lead leads of the diode are bent and connected. In what is described in claim 11 or claim 12,
An ignition coil device for an internal combustion engine, wherein the connecting portions of both leads of the diode are bent in different directions. In an independent ignition type ignition coil device for an internal combustion engine that is inserted into a plug hole of each cylinder of the internal combustion engine and directly connected to the ignition plug, the igniter is disposed above the plug hole, and the coil part is disposed in the plug hole. An ignition coil device for an internal combustion engine in which a diode is disposed in an igniter case that is disposed and accommodates the igniter. What is described in claim 14
An ignition coil device for an internal combustion engine, wherein a secondary coil terminal is disposed between one end on the anode side of the diode and a secondary coil.

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