JPH07101655B2 - Internal combustion engine ignition coil device - Google Patents

Description

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

[Conventional technology]

FIG. 3 is a circuit diagram showing in principle the main part of a conventionally known ignition coil device for an internal combustion engine, showing the current flowing through the ignition coil (1) and the primary coil (1a) of the ignition coil (1). The igniter (2) as a control circuit unit for controlling is housed in separate case bodies, and the case body housing the igniter (2) is fixed to the case body housing the ignition coil (1), or is ignited. (2) was housed inside the distributor. (Illustration is omitted for simplification) [Problems to be Solved by the Invention] In the conventional internal combustion engine ignition coil device configured as described above, the case body that houses the ignition coil and the case body that houses the igniter are different. Since it is constructed in the body, there is a problem that the device becomes large, the mountability is poor, and the cost is high.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an internal combustion engine ignition coil device that is small in size, has good mountability and heat dissipation, and can be obtained at low cost.

[Means for Solving the Problems]

An internal combustion engine ignition coil device according to the present invention includes an iron core having a yoke portion, a coil assembly including a primary coil and a secondary coil wound around the iron core, and at least a part of the yoke portion is exposed and the remaining portion is exposed. A case body that surrounds the coil assembly, surrounds the coil assembly, and has a pocket portion on the outer side of these coils, a portion of which abuts on the exposed portion of the yoke portion, and from the abutting portion to the inside of the pocket portion. An extended heat sink, a control circuit portion arranged on the heat sink in the pocket portion and controlling a current flowing through the primary coil, and opposite to a contact surface of the heat sink with respect to the yoke portion. The side surface is a mounting surface for a vehicle body, an internal combustion engine, or the like.

[Action]

In the case body of the present invention, the control circuit portion is integrally formed so as to surround the heat sink and the ignition coil, and the heat sink whose one end is brought into contact with the yoke portion is generated from the control circuit portion and the coil assembly. The heat is transferred to the vehicle body or the internal combustion engine side through the mounting surface formed on the side opposite to the contact surface with respect to the yoke portion and radiated.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, an ignition coil device (3) includes an iron core (4) having a yoke portion (4a), a primary coil and a secondary coil wound around the iron core (4) (for details, see FIG. (Illustration is omitted)
A coil assembly (5) consisting of a case body (5) that exposes at least a part of the yoke portion (4a) and surrounds the remaining portion, surrounds the coil assembly (5), and has a pocket portion (61) ( 6), one end portion (71) is in contact with the exposed portion of the yoke portion (4a), and the attachment portion (72) of the cooled object is provided so as to extend inside the pocket portion (61). The heat sink (7) is provided in close contact with the mounting portion (72) of the seat sink (7) in the pocket portion (61).
A control circuit section (8) including a power transistor for controlling the current flowing through the next coil is provided.

In this embodiment, the iron core (4) is formed in a U-shape so that it can be divided into two before assembly (not shown). Further, the case body (6) is also formed of a main portion (6A) surrounding the coil assembly (5) and the like, and a lid portion (6B) having a connector (63) and a high voltage terminal (64). . The main part (6A) is formed by integrally molding one of the divided iron cores with the heat sink (7) pressed against the core. The lid portion (6B) is formed integrally with the coil assembly (5) or alone by molding. The right side of FIG. 1 of the molded main part (6A) is open, and the coil assembly (5) and the control circuit part (8) are sequentially inserted from this open side face for control. The circuit portion (8) is a fixing means (8) such as a screw passed through an insertion hole (62) provided in the case body (6).
It is tightly fixed to the heat sink (7) by 1), and the insertion hole (62) is closed by a label body (10) displaying, for example, a model name, a manufacturer name, a lot number and the like. Then, a necessary connection is made between the connector portion (63) provided on the lid portion (6B), the high voltage terminal (64) and the control circuit portion (8), and the lead wire (not shown) of the coil assembly (5). After that, the space (9) is filled with epoxy resin and the pocket (6
1) is filled with silicone gel. At this time, in addition to the original display function of the label body (10), it has an action of preventing the filler from flowing out. Next, the other of the divided iron cores is assembled. The heat sink (7) is formed by press-molding a plate material made of a good heat conductor such as aluminum, copper, or an alloy thereof, and a part of the surface thereof is a window provided in the case body (6). Division (65) (6
In 6), it is exposed to the outside air, and the heat dissipation effect is increased.

Further, the surface of the heat sink (7) opposite to the contact surface (71) with respect to the yoke portion (4a) is attached to an attachment portion (11) provided at an appropriate location of the vehicle body or the internal combustion engine ( 73), and the bolt (13) is inserted into the mounting hole (12) provided through the yoke portion (4a) and the heat sink (7) as shown in FIG. It is attached to the object by screwing it into the screw groove (11a) provided in the.

Although details are omitted in the above-mentioned configuration, the control signal is basically sent to the control circuit section (8) through the connector (63) according to the same operation principle as that of the conventional apparatus shown in FIG. Then, the control circuit section (8) controls the current flowing through the primary coil of the coil assembly (5) based on this control signal. A pulsed high voltage is generated in the secondary coil according to the control of the primary coil, and this high voltage is sent from the high voltage terminal (64) to a spark plug (not shown) via a distributor (not shown). And the engine is ignited. The heat generated from the power transistor used in the control circuit section (8) and the heat generated from the coil assembly (5) and the like by this operation are transferred to the heat sink (7), and part of the heat is generated in the window section (65). , (66) and the like are radiated to the outside air, and a part of the heat is radiated to the mounting portion (11) through the mounting surface (73). Further, a part of the generated heat is effectively transmitted to the case body (6) through the filled resin material, and heat is also radiated from the surface portion thereof.

In this embodiment, since the control circuit part (8) and the coil assembly (5) are housed in the same case body (6), the device can be made smaller and lighter, and one end of the heat sink (7) has an iron core. The structure is simple because it is in contact with the yoke portion (4a) of (4) and the non-contact surface side is the mounting surface (73).
Therefore, it has advantages that it is easy to manufacture, can be obtained at low cost, and has excellent mountability and heat dissipation.

In addition, in the above-mentioned embodiment, the iron core (4) is formed by being divided, but it is not necessarily limited to this. Further, although the control circuit including the power transistor is used as the control circuit unit (8), it is not limited to this, and the circuit configuration is not particularly limited. Further, the window portions (65) (66) of the case body (6) may be omitted. In short, the above embodiment is merely an example shown to facilitate understanding of the present invention,
Besides the above, various modifications and changes can be made within the spirit of the present invention.

〔The invention's effect〕

As described above, according to the present invention, an iron core having a yoke portion,
A coil assembly consisting of a primary coil and a secondary coil wound around the iron core, exposing at least a part of the yoke portion and enclosing the rest, and enclosing the coil assembly, and the outer portion of these coils. A case body having a pocket portion, a part of which abuts on the exposed portion of the yoke portion, and a heat sink is provided extending from the abutting portion into the pocket portion; and a heat sink disposed in the pocket portion on the heat sink. A control circuit section for controlling the current flowing through the primary coil is provided, and the surface of the heat sink opposite to the contact surface with respect to the yoke portion is a mounting surface for a vehicle body or an internal combustion engine. Therefore, there is an effect that it is possible to obtain an internal combustion engine ignition coil device which is excellent in mountability and heat dissipation, can be easily reduced in size and weight, and can be manufactured at low cost.

[Brief description of drawings]

1 and 2 show a main part of an internal combustion engine ignition coil device according to an embodiment of the present invention. FIG. 1 is a side view and FIG. 2 is a front view. FIG. 3 is a circuit diagram showing in principle the essential parts of a conventional internal combustion engine ignition coil device. In the figure, (3) is an ignition coil device, (4) is an iron core,
(4a) is a yoke part, (5) is a coil, (6) is a case body,
(61) is a pocket part, (7) is a heat sink, (73) is a mounting surface, and (8) is a control circuit part. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] Claim: What is claimed is: 1. An iron core having a yoke portion, a coil assembly comprising a primary coil and a secondary coil wound around the iron core, at least a part of the yoke portion is exposed, and the remaining portion is surrounded and the coil is formed. A case body surrounding the assembly and having a pocket portion on the outer side of these coils, a part of which abuts on the exposed portion of the yoke portion, and which extends from the abutting portion into the pocket portion. A heat sink is provided on the heat sink in the pocket portion, and includes a control circuit portion for controlling a current flowing to the primary coil, and a surface of the heat sink opposite to a contact surface with respect to the yoke portion is a vehicle body or an internal combustion engine. An internal combustion engine ignition coil device characterized by being a mounting surface for an engine or the like.