JP2012092723A - Ignition device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome the problem that electrically connecting electric components including a diode by welding lead wires when an ignition device is equipped with electric components such as a diode causes a high possibility that variation occurs individually in soldering or welding.SOLUTION: The ignition device for the internal combustion engine includes a first diode group and a second diode group configured by connecting a plurality of diodes, to the inside bottom surface of a case, for preventing either one of the high voltage of a first ignition coil or a second ignition coil from flowing to the other. The plurality of diodes have a cylindrical or planer lead wire, and the first diode group and the second diode group have the lead wires electrically connected by a sleeve or an electro-conductive glue.

Description

The present invention relates to an internal combustion engine ignition device.

Conventionally, in lean combustion and stratified combustion, in order to prevent misfire caused by variation in the air-fuel ratio and smoldering of the spark plug, multiple ignition coils are used to perform multiple ignition on one spark plug . However, when a plurality of ignition coils are used in this way, a high voltage flows into the other ignition coil that is charged when one ignition coil is discharged, which may damage the ignition coil. In such a situation, it is known to arrange a diode on the high voltage output side of the ignition coil.

When the ignition device is provided with an electronic component such as a diode as described above, the lead wire of the electronic component such as the diode is electrically connected by soldering. In such a situation, for example, it is known to have a configuration as disclosed in Japanese Patent Application Laid-Open No. 2001-082305 (hereinafter “Patent Document 1”).

In the ignition device of Patent Document 1, a center core, a secondary bobbin, a secondary coil, a primary bobbin, a primary coil, and a side core are arranged in order from the center (inner side) to the outer side in the coil part case. The In addition, a Zener diode having leads formed in a certain shape is molded into a desired shape with a silicone resin for a product after assembling a primary coil, a secondary coil, a center core, a coil case, and a circuit case with a connector. Furthermore, an internal combustion engine ignition device has been proposed in which the molded Zener diode is soldered to a circuit case with a connector.

Japanese Patent Laid-Open No. 2001-082305

However, the above conventional ignition device has the following problems. That is, in the ignition device of Patent Document 1, a Zener diode with a lead molded is molded into a target shape with silicone resin, and the molded Zener diode is connected to a circuit case with a connector by soldering. Since welding or soldering varies individually, there is a high possibility that defects will occur.

In addition, in an ignition device that has two ignition coils in the case and performs multiple ignition in order to prevent misfire caused by variations in the air-fuel ratio in lean combustion and stratified combustion and smoldering of the spark plug, In order to cope with this, it is necessary to connect a plurality of large-capacity diodes, which increases the number of locations that require welding or soldering and increases the probability of occurrence of defects.

The present invention has been made in view of the above problems, and aims to provide an ignition device that is electrically connected to an electronic component such as a diode without using welding or soldering, etc., and ensures high quality and high productivity. To do.

In order to solve the above problems, the present invention is configured as follows. That is, in the invention of claim 1, a case, a primary coil in which the primary winding is wound around the primary bobbin in the case, a secondary coil in which the secondary winding is wound around the secondary bobbin, and the iron A first ignition coil comprising a core and a second ignition coil are provided, a connector for supplying power from the outside to the case is disposed, and a high voltage terminal for supplying a high voltage to the spark plug is disposed on the case In the ignition device in which the coil housing portion of the case is filled with mold resin, the high voltage of one of the first ignition coil and the second ignition coil flows to the other side on the inner bottom surface of the case. A first diode group and a second diode group configured by connecting a plurality of diodes, and the plurality of diodes are connected to at least one of a sleeve and a conductive adhesive. And ignition device for an internal combustion engine and butterflies.

In the invention of claim 2, a case, a primary coil having a primary winding wound around a primary bobbin in the case, a secondary coil having a secondary winding wound around a secondary bobbin, and an iron core Comprising a first ignition coil and a second ignition coil comprising a connector for supplying power from the outside to the case, and a high voltage terminal for supplying a high voltage to the ignition plug to the case, In the ignition device in which the coil housing portion of the case is filled with mold resin, the high voltage of one of the first ignition coil and the second ignition coil is prevented from flowing to the other on the inner bottom surface of the case. An ignition device for an internal combustion engine comprising a first diode group and a second diode group configured by connecting a plurality of diodes, wherein the plurality of diodes are connected by a conductive adhesive To

In the above configuration, the plurality of diodes have cylindrical or flat lead wires, and the first diode groups 60a, 60b, and 60c and the second diode groups 62a, 62b, and 62c are the lead wires 64. You may connect via.

As described above, the first bottom electrode is configured by connecting a plurality of diodes to the inner bottom surface of the case to prevent the high voltage of one of the first ignition coil and the second ignition coil from flowing to the other. Provided with a diode group and a second diode group, the plurality of diodes have cylindrical or flat lead wires, and the first diode group and the second diode group connect the lead wires with a sleeve or a conductive adhesive. Thus, an electronic device such as a diode can be electrically connected without using welding or soldering, and an ignition device with high quality and high productivity can be realized.

In addition, in an ignition device that has two ignition coils in the case and performs multiple ignition in order to prevent misfire caused by variations in the air-fuel ratio in lean combustion and stratified combustion and smoldering of the spark plug, In order to cope with this, it is necessary to connect a plurality of large-capacity diodes. Therefore, the number of places where welding or soldering is required increases, and the same effect can be obtained by the above-described configuration.

1 is a perspective view of an ignition device according to a first embodiment of the present invention. It is BB sectional drawing seen from the arrow (A) direction of the ignition device of FIG. It is a top view of the case of the ignition device which is the 1st example of the present invention. It is a perspective view which shows the wiring of the diode of the ignition device which is the 1st Example of this invention. It is a figure which shows the circuit structure of the ignition device made into the 1st Example of this invention. It is a perspective view which shows the wiring of the diode of the ignition device made into the modification of the 1st Example of this invention.

An example showing the embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view of an ignition device according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line BB of the ignition device of FIG. FIG. 3 is a top view of the case of the ignition device according to the embodiment, FIG. 4 is a perspective view showing the wiring of the diode of the ignition device according to the first embodiment of the present invention, and FIG. FIG. 5 is a diagram showing the circuit configuration of the ignition device, and FIG. 6 is a perspective view showing the wiring of the diodes of the ignition device as a modification of the first embodiment of the present invention.

1 to 6, a case 70 forming the outer shape of the ignition device 100 is formed by integral molding in a box shape having one opening surface. Further, the case 70 is formed with two case fixing portions 72 for attaching and fixing the ignition device 100 to an engine head (not shown) on the ignition device 100 at two locations, that is, an opening surface of the case 70 and a substantially vertical surface. Further, a high voltage tower 74 for providing a high voltage terminal 32 for supplying a secondary voltage to the ignition plug 110 is formed on the bottom surface of the case 70 so as to protrude into a plug hole formed in the upper part of the engine. Yes.

The coil housing portion of the case 70 includes a first ignition coil 102 and a second ignition coil 104, and the first ignition coil 102 and the second ignition coil 104 are formed by laminating a plurality of thin plates. A primary coil 14 in which a primary winding 12 is wound about 50 turns around the outer periphery of a primary bobbin 10 formed of resin on the outer periphery of the iron core 30, and the primary coil The secondary bobbin 20 formed of resin on the outer periphery of the secondary bobbin 20 includes a secondary coil 24 in which a secondary winding 22 is wound around 3000 turns. Further, the primary bobbin 10 is formed with guide grooves 16 that connect both axial ends of the primary bobbin 10.

The primary winding 12 starts to be wound from one end of the primary bobbin 10 and passes through the induction groove 16 to the other end of the primary bobbin 10, and the primary winding 12 is connected to the primary bobbin 10. The first layer is wound from the other end toward the one end. Further, the primary winding 12 has a second layer wound from one end of the primary bobbin 10 toward the other end, and the primary winding 12 extends from the other end of the primary bobbin 10 toward the one end. The third layer is wound and finished at one end of the primary bobbin 10.

Further, the guide groove 16 is formed on a surface close to the bottom surface side of the case 70 when the primary coil 14 is provided in the case 70. Further, a secondary low voltage terminal 26 is provided on the low voltage side of the secondary coil 24 of the first ignition coil 102 and the second ignition coil 104, and the secondary low voltage terminal 26 is provided in the first ignition coil 102. And the second ignition coil 104 is electrically connected to the low voltage side of the primary coil 14.

Further, secondary high voltage terminals 28 are provided on the high voltage side of the secondary coil 24 of the first ignition coil 102 and the second ignition coil 104, respectively. Further, a case side secondary high voltage terminal 76 is provided on each of the first ignition coil 102 and the second ignition coil 104 on the inner bottom surface of the case 70, and the secondary high voltage terminal 28 of the first ignition coil 102 is provided. Is electrically connected to the case side secondary high voltage terminal 76 disposed on the first ignition coil 102 side, and the secondary high voltage terminal 28 of the second ignition coil 104 is connected to the second ignition coil 104. It is electrically connected to the case side secondary high voltage terminal 76 arranged on the side.

Further, the case 70 includes a first igniter 50 for supplying an ignition signal to the first ignition coil 102 and a second igniter 52 for supplying an ignition signal to the second ignition coil 104. Further, the first igniter 50 and the second igniter 52 are constituted by switching elements, and an igniter terminal 54 is provided on each of the base side, the collector side, and the emitter side of the switching element.

Further, a connector 40 for supplying a primary voltage from the battery 112 and an ignition signal from the ignition device control unit 114 is provided on the side surface of the case 70. The connector 40 includes a power supply terminal 42, a first ignition signal input terminal, a second ignition signal input terminal, and a second ignition signal input terminal. The ignition signal input terminal and the ground terminal are provided with four terminals. Further, a primary coil terminal 18 is provided on the low voltage side of the primary coil 14 of the first ignition coil 102 and the second ignition coil 104.

One end of the power terminal 42 is connected to the primary coil terminal 18 of the first ignition coil 102 and the second ignition coil 104. Further, the other end of the power terminal 42 is connected to the battery 112, and the battery 112 is connected to the primary coil 14 of the first ignition coil 102 and the second ignition coil 104 via the power terminal 42. A primary voltage is supplied.

One end of the first ignition signal input terminal is connected to the igniter terminal 54 on the base side of the first igniter 50. Further, the other end of the first ignition signal input terminal is connected to the ignition device control unit 114, and the ignition device control unit 114 ignites the first igniter 50 via the first ignition signal input terminal. The signal is supplied.

One end of the second ignition signal input terminal is connected to the igniter terminal 54 on the base side of the second igniter 52. Further, the other end of the second ignition signal input terminal is connected to the ignition device control unit 114, and the ignition device control unit 114 ignites the second igniter 52 via the second ignition signal input terminal. The signal is supplied.

One end of the ground terminal is connected to the igniter terminal 54 on the emitter side of the first igniter 50 and the second igniter 52, and the other end of the ground terminal is connected to the ground. Further, the igniter terminal 54 on the collector side of the first igniter 50 is connected to the primary coil 14 of the first ignition coil 102, and the igniter terminal 54 on the collector side of the second igniter 52 is connected to the primary igniter terminal 54. The second ignition coil 104 is connected to the primary coil 14.

The terminals of the primary coil 14, the first igniter 50, the second igniter 52, and the connector 40 are connected by welding. Further, a first diode group for preventing the secondary voltage of one of the first ignition coil 102 and the second ignition coil 104 from flowing to the other ignition coil is provided on the inner bottom surface of the case 70. 60a, 60b, 60c and second diode groups 62a, 62b, 62c are provided.

The first diode group 60a, 60b, 60c and the second diode group 62a, 62b, 62c are provided with cylindrical lead wires 64 on the anode side and the cathode side of the respective diodes, and the first diode 60a. The lead wires 64 between the first diode 60b and between the first diode 60b and the first diode 60c are inserted into a tin-plated sleeve 66, and are crimped using a crimping tool. 3 are connected electrically. Further, the lead wire 64 between the second diode 62a and the second diode 62b and between the second diode 62b and the second diode 62c is inserted into the sleeve 66 and crimped using a crimping tool. Are connected in series and connected electrically.

The lead wires 64 on the anode side of the first diode 60a and the second diode 62a are coupled together and electrically connected to the high voltage terminal 32. Furthermore, the lead wire 64 on the cathode side of the first diode 60c is electrically connected to the case side secondary high voltage terminal 76 provided in the first ignition coil 102, and the second diode 62c The cathode side lead wire 64 is electrically connected to the case side secondary high voltage terminal 76 provided in the second ignition coil 104.

Further, the first diode groups 60a, 60b, 60c are arranged so as to avoid the portion C in FIG. 3 showing the case 70 extending in the bottom direction of the case 70 of the secondary low voltage terminal 26 of the first ignition coil 102. Yes. Further, the second diode groups 62a, 62b, 62c are arranged so as to avoid the D portion of FIG. 3 showing the case 70 extending in the bottom direction of the case 70 of the secondary low voltage terminal 26 of the second ignition coil 104. Yes.

Further, a groove portion 78 for embedding the first diode groups 60a, 60b, 60c, the second diode groups 62a, 62b, 62c, and the lead wires 64 is formed on the bottom surface inside the case 70. Further, a substantially U-shaped lead wire fixing for fixing the lead wire 64 of the first diode group 60a, 60b, 60c and the second diode group 62a, 62b, 62c to the groove portion 78 is provided. A total of 12 portions 80 are formed on each end of each of the first diode groups 60a, 60b, and 60c and the second diode groups 62a, 62b, and 62c. The lead wire 64 insertion opening is chamfered.

The groove 78 prevents the first diode group 60a, 60b, 60c and the second diode group 62a, 62b, 62c, the lead wire 64, and the lead wire fixing portion 80 from jumping out from the inner bottom surface of the case 70. It is formed to a depth. Further, an outer peripheral groove 82 is formed on the inner bottom surface of the case 70 to prevent the influence of a leak current due to a crack. It is formed so as to surround the entire circumference.

The outer circumferential groove 82 is formed with the same depth as the groove 78 and a width of about one third of the groove 78. Further, a first partition wall 84 and a second partition wall 86 are formed in the case 70 for preventing the spread of cracks generated between the first ignition coil 102 and the second ignition coil 104. .

Further, the first partition wall 84 seals the iron core crack of the first ignition coil 102 and positions the iron core 30 of the first ignition coil 102 in order to position the iron core 30. It is formed in contact with the iron core 30. Further, the second partition 86 seals the iron core crack of the second ignition coil 104 and positions the iron core 30 of the second ignition coil 104 so as to position the second ignition coil 104. It is formed in contact with the iron core 30.

Further, the first partition wall 84 and the second partition wall 86 are formed at the same height as the vertical height of the iron core 30 from the bottom surface of the case 70. Further, the ignition device 100 connects the first ignition coil 102 and the second ignition coil 104 in parallel, and the high voltage side of the secondary coil 24 of the first ignition coil 102 is connected to the first ignition coil 102. The high voltage side of the secondary coil 24 of the second ignition coil 104 is connected to the cathode side of the second diode 62c.

The anode sides of the first diode groups 60a, 60b, 60c and the second diode groups 62a, 62b, 62c are coupled together and then connected to the spark plug 110. Furthermore, the low voltage side of the primary coil 14 of the first ignition coil 102 and the second ignition coil 104 is connected to the positive side of the battery 112, and the first ignition coil 102 and the second ignition coil The ignition device control unit 114 is connected between the coil 104 and the battery 112.

The high voltage side of the primary coil 14 of the first ignition coil 102 is connected to the collector side of the first igniter 50, and the high voltage side of the primary coil 14 of the second ignition coil 104 is the The second igniter 52 is connected to the collector side. Further, the emitter sides of the first igniter 50 and the second igniter 52 are connected to the ground.

Further, when the output of the ignition signal S1 from the ignition device control unit 114 is turned on from the above configuration, a primary current I1 flows in the primary coil 14 of the first ignition coil 102, and the ignition device control unit 114 When the output of the ignition signal S2 from is turned on, a primary current I2 flows through the primary coil 14 of the second ignition coil 104. Further, when the output of the ignition signal S1 from the ignition device control unit 114 is turned off, the primary current I1 flowing through the primary coil of the first ignition coil 102 is cut off, and the first ignition coil 102 A secondary voltage is generated in the secondary coil 24 and discharged.

When the output of the ignition signal S2 from the ignition device control unit 114 is turned off, the primary current I2 flowing through the primary coil 14 of the second ignition coil 104 is cut off, and the second ignition coil A secondary voltage is generated in the secondary coil 24 of 104 and discharged. Further, by alternately repeating the ignition signals S1 and S2 from the ignition device controller 114, a secondary voltage is alternately applied to the secondary coil 24 of the first ignition coil 102 and the second ignition coil 104. appear.

The secondary voltages generated alternately in the secondary coil 24 of the first ignition coil 102 and the second ignition coil 104 are converted into the first diode groups 60a, 60b, 60c and the second diode, respectively. Via the groups 62a, 62b and 62c, the combined secondary voltage V is supplied to the spark plug 110, and multiple ignition is performed. Further, the case 70 is filled with a mold resin 90 that realizes electrical insulation of the ignition device 100 and physical fixation of each member.

The secondary voltage output from the first ignition coil 102 and the second ignition coil 104 is supplied from the high voltage terminal 32 to the ignition plug 110 via a conductive member accommodated in the plug hole. The

As a modification of the first embodiment, the sleeve 66 may be formed of another metal having electrical conductivity such as iron or aluminum. The lead wire 64 may have a flat plate shape. Furthermore, the first diode group 60a, 60b, 60c and the second diode group 62a, 62b, 62c may change the capacity and number of diodes according to the output of the ignition device 100.

Further, the sleeve 66 may be used to electrically connect the lead wire 64 on the anode side of the first diode 60a and the second diode 62a and the high voltage terminal 32. Further, the lead wire 64 on the cathode side of the first diode 60c is electrically connected to the case side secondary high voltage terminal 76 provided in the first ignition coil 102 by using the sleeve 66. Alternatively, the lead wire 64 on the cathode side of the second diode 62c is electrically connected to the case side secondary high voltage terminal 76 provided in the second ignition coil 104 by using the sleeve 66. You may go.

Further, instead of the sleeve 66, a conductive adhesive 68 made of liquid crystal resin and silver may be used, or the sleeve 66 and the conductive adhesive 68 may be selectively used depending on the connection location. Further, the conductive back adhesive 68 may be composed of a binder resin such as epoxy, silicone, polyimide, and polyurethane and a conductive filler resin such as silver, nickel, and carbon.

10: 1 primary bobbin
12: Primary winding
14: Primary coil
16: Guide groove
18: Primary coil terminal
20: Secondary bobbin
22: Secondary winding
24: Secondary coil
26: Secondary low voltage terminal
28: Secondary high-voltage terminal
30: Iron core
32: High voltage terminal
40: Connector
42: Power supply terminal
50: First igniter
52: Second igniter
54: Igniter terminal
60a, 60b, 60c: First diode group
62a, 62b, 62c: second diode group
64: Lead wire
66: Sleeve
68: Conductive adhesive
70: Case
72: Case fixing part
74: High pressure tower
76: Secondary high-voltage terminal on the case side
78: Groove
80: Lead wire fixing part
82: Outer groove
84: First partition
86: Second bulkhead
90: Mold resin
100: Ignition device
102: First ignition coil
104: Second ignition coil
110: Spark plug
112: Battery
114: Ignition system controller

Claims (3)

A first ignition coil comprising a case, a primary coil having a primary winding wound around a primary bobbin in the case, a secondary coil having a secondary winding wound around a secondary bobbin, and an iron core; A second ignition coil;
A connector for supplying power from the outside to the case is disposed,
A high voltage terminal for supplying a high voltage to the spark plug is disposed in the case,
In the ignition device in which the coil housing portion of the case is filled with mold resin,
A first diode configured by connecting a plurality of diodes to the inner bottom surface of the case to prevent a high voltage of one of the first ignition coil and the second ignition coil from flowing to the other A group and a second diode group,
The internal combustion engine ignition device, wherein the plurality of diodes are connected by a sleeve. A first ignition coil comprising a case, a primary coil having a primary winding wound around a primary bobbin in the case, a secondary coil having a secondary winding wound around a secondary bobbin, and an iron core; A second ignition coil;
A connector for supplying power from the outside to the case is disposed,
A high voltage terminal for supplying a high voltage to the spark plug is disposed in the case,
In the ignition device in which the coil housing portion of the case is filled with mold resin,
A first diode configured by connecting a plurality of diodes to the inner bottom surface of the case to prevent a high voltage of one of the first ignition coil and the second ignition coil from flowing to the other A group and a second diode group,
The ignition device for an internal combustion engine, wherein the plurality of diodes are connected by a conductive adhesive. The plurality of diodes have cylindrical or flat lead wires,
The internal combustion engine ignition device according to claim 1 or 2, wherein the first diode group and the second diode group are connected via the lead wire.

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