JPH07288212A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent an input/output terminal from moving unnecessarily by pulling out the terminal from the mold and holding and fixing the pulled out part by the mold. CONSTITUTION:A DIS igniter module 1 relays electric signals to a power switching element 7 and to a control circuit board 5. An input/output terminal 3 integrally formed with an outer mold case 2 is connected with an internal element by conductive wire 4. Since the module is incorporated at high temperature and high pressure resin molding, the module is prevented from breaking, the pulled out part of the input/output terminal 3 from the mold is held by the molding die at the time of formation, and thermal influence of resin heat to the input/output terminal 3 is prevented. Thus, unnecessary moving of the terminal is prevented, and since heat to the terminal at the time of formation is dissipated, suitable connection stability is always maintained and life time is stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device for an internal combustion engine, and more particularly to fixing a terminal integrally formed with a molded case.

[0002]

2. Description of the Related Art In the prior art, the terminal was pressed only by the upper mold or the lower mold of the mold, but in this method, an external force is applied to the terminal due to the uneven thickness of the mold resin around the terminal. I didn't consider the terminal and flare when such things were added. Therefore, when the terminal is exposed, there is a possibility that the terminal is displaced and the pad or the like soldered to the terminal is peeled off.

[0003]

In the above-mentioned prior art, when the terminal is misaligned, the accurate position of the terminal is displaced, and an external force is applied to the terminal to deform the terminal, thereby functioning as a mold case. For example, there is a possibility that the role of electrical connection with the internal element cannot be fully exerted. Even when the above problem occurs, it is an object to prevent the terminal from being cracked.

[0004]

In order to solve the above problems, the input / output terminals are pulled out from the mold, and the pulled out portions are held and fixed by a mold. The shape of the mold holding the terminal is flat and flat, or flat and wedge-shaped, and the upper and lower molds are chucked so as to grip.

[0005]

[Operation] By holding the terminals in the upper and lower molds, the movement of the terminals molded in the case is restricted. When integrally molding the terminals into the case, for example, when molding brass terminals in polybutylene terephthalate, there are times when the hardness of the terminals is lower than the pressure during resin molding, and at such times the terminals move or twist. Or If the terminal moves, the connection with the internal element has a difficulty in positioning, and if the terminal is twisted, it adversely affects the soldered state of the pad on the terminal.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The basic circuit shown in FIG. 6 is an embodiment showing an example of an ignition system. Primary winding 14 and secondary winding 1
In the ignition coil having 5, the primary winding 14, one of which is used as a power source from a battery 17, and the other end of which is a power switching element 7 for driving the ignition coil (having two types of Darlington transistor type and MOS-FET type). It is connected to the. Further, the secondary voltage generated in the secondary winding 15 is guided to the spark plug 16. This is an embodiment in which a relay circuit 18 for preventing reverse polarity connection of the battery 17 is incorporated. The electric signal controlled by the engine control unit 19 is DI
Further controlled by the control circuit board 5 of the S igniter (hereinafter referred to as igniter), the primary current flowing to the power switching element 7 and flowing through the primary winding 14 is conducted and cut off, so that the secondary side is provided. Generates high voltage. Figure 1
The DIS igniter module 1 shown in FIG. 1 is an embodiment that most clearly represents the present invention. Relaying an electric signal to the power switching element 7 and the control circuit board 5;
Exterior mold case 2 (eg polybutylene terephthalate, epoxy, pressure gel type epoxy, PPS, PPO
The input / output terminals 3 integrally formed with each other are connected to the internal element by a conductive wire 4 (for example, bonding with an aluminum wire, nickel wire welding, annealed copper wire soldering, lead frame welding, etc.). The input / output terminals 3 are set in a mold, and the resin is cast and molded. At this time, the resin becomes a considerably high temperature. Further, since the pressure at the time of casting is also considerable, in general, the peripheral mold 13 of the input / output terminal 3 is provided so that no pressure is applied to the input / output terminal 3.
Etc. are designed to have a constant wall thickness. However, if the peripheral mold 13 is forced to have a nonuniform wall thickness due to design reasons, a large pressure acts on the input / output terminals 3. Therefore, the input / output terminal 3 is likely to be twisted or bent. If the input / output terminal 3 is displaced for such a reason, the connectivity with the internal element becomes difficult. Further, a metal pad 9 is formed on the input / output terminal 3.
(For example, aluminum pad, iron nickel pad for welding, etc.)
When the above is joined by the solder 12, the possibility of peeling from the solder portion becomes extremely high due to the deformation of the input / output terminal 3 and the like. In this case, not only the conductive wire 4 cannot be connected, but even if the connection is made luckily, the module will be broken in the assembled state. In order to prevent this, when molding the resin, the part where the input / output terminal 3 is pulled out is gripped and chucked by the mold. The shape of the chuck is shown in Figs.
The terminal lead-out portion 20 shown in FIG. This part is chucked by the upper and lower molds. The shape of the upper and lower molds can be held firmly by making them flat and flat or flat and wedge-shaped. Further, by doing so, there is a heat dissipation effect of preventing the heat of the resin from exerting a thermal influence on the input / output terminal 3, for example, melting the solder 12 by the heat. The components of the DIS igniter module 1 are as follows. First, the power switching element 7 is directly mounted on the heat sink 6 (aluminum plate plated with nickel, copper plate plated with nickel, etc.) or the insulating plate 8 (alumina, ticker aluminum, beryllia, etc.). Directly or with a stress relaxation plate (eg, molybdenum plate, copper plate, etc.) is joined by soldering or brazing. Further, the control circuit board 5 is adhered by an adhesive (for example, silicon-based, epoxy-based, etc.), and each is connected by the conductive wire 4. Further, the exterior mold is adhered so as to cover it. As shown in FIG. 2, the DIS igniter module 1
In order to protect the internal elements, a silicon-based gel or the like is cast, and the cover 10 is bonded with an adhesive (silicon-based, epoxy-based, etc.). Alternatively, the method of ultrasonic welding may be applied to all the joints described so far. FIG. 7 shows an embodiment in which the input / output terminal 3 is held by a mold (upper and lower) mold 21. In this embodiment, one of the molds has a wedge shape.

[0007]

According to the present invention, unnecessary stress on the terminal is prevented, and the heat applied to the terminal during resin molding is radiated. Therefore, the stress of the pad soldering portion on the terminal is relaxed, and Since the position of the terminal is also accurate, the connection with the internal element can be reliably performed, and the proper connection stability is always maintained.
It is possible to supply a reliable module with a stable life.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment in which the present invention is incorporated in a DIS igniter.

FIG. 2 is a side view of FIG.

FIG. 3 is a partially enlarged view of a terminal portion A.

FIG. 4 is a side view of FIG.

FIG. 5 is a view showing a mold case for exterior.

FIG. 6 is a diagram showing an example of an ignition system circuit.

FIG. 7 is a diagram showing an example of the shapes of upper and lower molds.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... DIS igniter module, 2 ... Exterior mold case, 3 ... Input / output terminal, 4 ... Conductive wire, 5 ... Control circuit board, 6 ... Heat sink, 7 ... Power switching element, 8 ... Insulation plate, 9 ... Metal Pad, 10 ... cover,
11 ... Adhesive, 12 ... Solder, 13 ... Peripheral mold, 1
4 ... Primary winding, 15 ... Secondary winding, 16 ... Spark plug, 1
7 ... Battery, 18 ... Relay circuit, 19 ... Control unit, 20 ... Terminal lead-out part, 21 ... Mold (upper and lower)
Type.

Claims (2)

[Claims] 1. An internal combustion engine ignition device comprising a molded case having an external input / output terminal integrally molded with the molded case, a switching semiconductor element, a control circuit board and a heat sink. An ignition device for an internal combustion engine, characterized in that the element side end is held by a mold type. 2. The ignition device for an internal combustion engine according to claim 1, wherein the terminal end portion is pulled out by 0.8 mm or more from the mold, and the pulled out portion is held by a wedge-shaped mold die.