JPH07101656B2 - 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 different 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 and the cost is high.

The present invention has been made to solve the above problems, and an object thereof is to obtain an internal combustion engine ignition coil device that is small in size, easy to manufacture, and inexpensive to obtain.

[Means for Solving the Problems]

An internal combustion engine ignition coil device according to the present invention has an iron core having a yoke portion, a coil assembly including a primary coil and a secondary coil wound around the iron core, and a part of the coil assembly abuts on the yoke portion. A heat sink that is provided to extend along the outside of the coil assembly from the abutting portion and has a mounting portion for the cooled object in the extending portion, and at least a part of the yoke portion of the iron core is exposed to leave the remaining portion. A case body that surrounds the coil assembly and the mounting portion of the heat sink, and has a pocket portion formed between the surface of the mounting portion of the heat sink and an insertion hole formed in the pocket portion, A control circuit portion for controlling a current flowing through the primary coil, the insertion hole being provided in close contact with a mounting portion of the heat sink in the pocket portion by a fixing means inserted through the insertion hole. Ingredients label body, which is constituted to include a balance of the resin material filled in the space of the pocket portion.

[Action]

In the case body according to the present invention, the control circuit portion is surrounded by the heat sink and the ignition coil to be integrally configured. Further, by accommodating the control circuit portion in the pocket portion and closing the insertion hole for inserting the fixing means for adhering the control circuit portion to the heat sink with the label, the resin material can be easily filled.

〔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) abuts on the exposed portion of the yoke portion (4a) and is provided so as to extend along the outside of the coil assembly (5) from the abutting portion. A heat sink (7) having a mounting portion (72) for the body to be cooled, and a control comprising a power transistor provided in close contact with the mounting portion (72) for controlling the current flowing through the primary coil. A circuit section (8) and the like are provided.

In the above embodiment, the iron core (4) is divided into two in a U shape 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 (63) provided on the lid (6B), the high voltage terminal (64) and the control circuit (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 lid portion (6B) is fitted into the open portion of the main portion (6A), and 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 provided on the case body (6). Windows (65) (66)
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), 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 the details are omitted in the above-mentioned configuration, it is basically generated separately in the control circuit unit (8) through the connector (63) according to the same operation principle as that of the conventional device shown in FIG. When the control signal is sent, the control circuit section (8) controls the current flowing through the primary coil of the coil assembly (5) based on the control signal. A pulsed high voltage is generated in the secondary coil according to the control of the primary coil,
This high voltage is sent to the distributor by a high tension cord (not shown) connected to the high voltage terminal (64). By this operation, heat generated from the power transistor that constitutes the control circuit section (8) and heat generated from the coil assembly (5) and the like are transferred to the heat sink (7), and part of the heat is generated in the window section (65) (66). ) 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 unit (8) and the coil assembly (5) are housed in the same case body (6), the device can be made compact and lightweight, and the control circuit unit (8) can be installed in the case body (6). The insertion hole (62) which is housed in the pocket portion (61) provided in 6) and provided with the fixing means (81) for closely adhering this to the heat sink (7) is closed by the label body (10). Since the structure is adopted, there is an advantage that the device can be assembled smoothly without waste, and therefore the manufacturing is easy and the device can be obtained at a low cost.

In addition, although the case body (6) is formed of the main portion (6A) and the lid portion (6B) in the above embodiment, the case body (6) is not necessarily limited to this. The same applies to the division of the iron core (4). Further, although the control 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 portion (65) of the case body (6)
(66) may be omitted. In short, the above embodiment is merely an example shown for facilitating the understanding of the present invention, and it is needless to say that 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 composed of a primary coil and a secondary coil wound around the iron core, a part of which abuts on the yoke portion, and which extends from the abutting portion along the outside of the coil assembly. A heat sink having an attachment portion for the cooled body in the extended portion, at least a part of the yoke portion of the iron core is exposed to surround the remaining portion, and surrounds the coil assembly and the attachment portion of the heat sink, and A case body having a pocket portion formed between the heat sink and the mounting portion surface and an insertion hole formed in the pocket portion, and a fixing means for inserting the insertion hole into the attachment portion of the heat sink in the pocket portion. A control circuit section for controlling the current flowing through the primary coil, a label body for closing the insertion hole, and a resin material filled in the remaining space of the pocket section. Since it is configured so obtain, is compact lightweight, there is an effect that the manufacturing easy and inexpensive engine ignition coil device can be obtained. In addition to the display function, the label body has an effect of preventing the resin material from flowing out.

[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 assembly, (6) is a case body, (61) is a pocket part, (62) is an insertion hole, (7) is a heat sink, and (8) is a control circuit part. , (81) is a fixing means, and (10) is a label body. 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, a part of which is in contact with the yoke portion, and the coil is in contact with the contact portion. A heat sink extending along the outside of the assembly and having a mounting portion for the cooled body in the extended portion, at least a part of the yoke portion of the iron core is exposed to surround the remaining portion, and the coil assembly is also provided. A case body that surrounds the three-dimensional body and the attachment portion of the heat sink and has a pocket portion formed between the heat sink and the surface of the attachment portion of the heat sink, and an insertion hole provided in the pocket portion, and the heat sink in the pocket portion. A control circuit portion that is provided in close contact with the mounting portion by a fixing means that is inserted through the insertion hole and that controls the current flowing through the primary coil; a label body that closes the insertion hole;
An internal combustion engine ignition coil device comprising a resin material filled in the remaining space of the pocket portion.