JP2544846Y2 - Ignition device for internal combustion engine - Google Patents

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 in which an IC package body in which a power switch is solid-sealed with a resin is disposed in a case containing an ignition coil.

[0002]

2. Description of the Related Art FIG. 2 is an electric circuit diagram of an ignition device for an internal combustion engine. Reference numeral 1 denotes a power transistor that cuts off the primary current through a primary coil 2 of an ignition coil, and 3 denotes a current limiter by detecting a potential difference caused by the primary current. This is a current detection unit that transmits a signal for controlling the primary current to the circuit unit 4.

FIG. 3 is a side sectional view of an ignition device for an internal combustion engine which has already been filed by the present applicant, and FIG. 4 is a left side view of FIG. 3 before a case is filled with an insulating resin. Is the case,
Reference numeral 6 denotes a secondary coil disposed in the case 5 and wound around an iron core 7 around the primary coil 2. Reference numeral 8 denotes a connector molded integrally with the case 5, and reference numeral 9 denotes an insulation filled in the case 5. Resin.

[0004] Reference numeral 10 denotes a secondary coil ground wire for connecting the first connector terminal 11 to one end of the secondary coil 6, and reference numeral 12 denotes a power supply line for connecting the second connector terminal 13 to one end of the primary coil 2. , 14 are control signal lines connecting the third connector terminal 15 and the base terminal 16 of the power transistor 1, and 17 is the fourth connector terminal 18 and the current limiting circuit unit 4.
Is a ground line connecting the limiting circuit terminal 19 and a collector line 20 connecting the collector terminal 21 of the power transistor 1 and the other end of the primary coil 2.

[0005] Reference numeral 22 denotes a heat radiating plate provided in the case 5;
Numeral 3 denotes an IC package bonded to the heat sink 22.
The package body 23 and the heat radiating plate 22 are pressed into the case 5 and fixed. This IC package body 23
The power transistor 1 and the current limiting circuit 4 are solid-sealed with resin by transfer molding.

In the above-described ignition device for an internal combustion engine, the primary current of the primary coil 2 flows through the current detecting section 3, so that the current detecting section 3 detects the value as a potential difference. A control signal is sent to the unit 4. The current limiting circuit 4 controls the primary current flowing through the primary coil 2 of the ignition coil based on this signal. A high voltage is generated in the secondary coil 7 of the ignition coil according to the primary current flowing through the primary coil 2, and the high voltage is sent to the distributor.

[0007]

In the ignition device for an internal combustion engine configured as described above, the power switch including the power transistor 1 and the current limiting circuit unit 4 is solid-sealed, so that the power switch is handled as a single unit. Although there are advantages such as easy handling during manufacturing and improvement in productivity, stress is applied to the IC package body 23 when the IC package body 23 is pressed into the case 5 and the IC package body 23 There has been a problem that there is a risk of breakage, and the press-fitting operation is also troublesome.

The present invention has been made to solve such a problem, and an object of the invention is to provide an ignition device for an internal combustion engine that can be smoothly pressed into a case without damaging an IC package.

[0009]

An ignition device for an internal combustion engine according to the present invention has a receiving portion for receiving an IC package and a heat sink, and a receiving portion provided in the receiving portion for receiving the IC package and the heat sink. A holding piece for positioning and holding, a receiving part integrated with the IC package body and the heat sink is guided along a guide formed in the case,
An IC package and a heat sink are housed in a case.

[0010]

In the present invention, the receiving portion integrated with the IC package and the heat sink is guided along the guide formed in the case, and the IC package and the heat sink are stored in the case. At this time, no stress is applied to the IC package body. In addition, I
The C package and the heat sink are integrated with the receiving portion.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is an exploded perspective view of a main part showing an embodiment of the present invention, and the same or corresponding parts as those in FIGS. In the figure, reference numeral 30 denotes an IC package body in which a power switch including a power transistor 1 and a current limiting circuit unit 4 is solid-sealed.
31 is a base terminal projecting from the IC package body 30,
32 is a limiting circuit terminal, and 33 is a collector terminal. 34
Denotes a heat sink disposed below the IC package body 30;
5 is a receiving portion for receiving the IC package body 30 and the heat radiating plate 34; 36 is a pressing piece formed on both sides of the receiving portion 35 for positioning and holding the IC package body 30 and the heat radiating plate 34 with respect to the receiving portion 35; Reference numeral 37 denotes a partition plate that is connected to the end of the receiving portion 35 and separates the base terminal 31, the limiting circuit terminal 32, and the collector terminal 33 from each other.

Reference numeral 40 denotes a first connector terminal whose base end is connected to one end of the secondary coil 6; 41, a second connector terminal whose base end is connected to one end of the primary coil 2; A third connector terminal whose base end is connected to the base terminal 31, a fourth connector terminal 43 whose base end is connected to the limiting circuit terminal 32.
The connector terminal 44 has a distal end connected to the collector terminal 33 and a proximal end connected to the other end of the primary coil 2.

In the ignition device for an internal combustion engine configured as described above, the guide 4 formed on the inner wall surface of the case 5
5, the IC package 30 and the heat sink 34 are pressed together with the receiving portion 35 so that the IC package 3
0 and the heat radiating plate 34 are housed in the case 5. Also,
The IC package 30 and the heat radiating plate 34 are positioned and held with respect to the receiving portion 35 by the holding pieces 36.
Further, the IC package 30 and the heat radiating plate 34 are in close contact with each other by the holding piece 36, and when the insulating resin 9 is filled in the case 5, the insulating resin 9 is placed between the IC package 30 and the heat radiating plate 34. Does not invade, and the heat of the IC package 30 is smoothly transmitted to the heat sink 34. Also, a partition plate 37 provided at the tip of the receiving portion 35
Thereby, insulation of each of the base terminal 31, the control circuit terminal 32, and the collector terminal 33 is ensured. In addition, the third
Is connected to the base terminal 31, the fourth collector terminal 43 is connected to the control circuit terminal 32, and the terminal
Are easily connected to the connector terminals 33, respectively.

The third connector terminal 42 and the fourth
By connecting the base end of the connector terminal 43 and the tip of the terminal 44 to the spring structures shown in FIG. 1B, connection can be made more easily. Also, each terminal 40,
The terminals 41, 42, 43 and the terminals 44 may be insert-molded in the IC package body 30.

[0015]

As described above, according to the ignition device for an internal combustion engine of the present invention, the receiving part integrated with the IC package and the heat sink is guided along the guide formed in the case, and Since the package is stored in the case, no stress is applied to the IC package during storage, and the IC package is not damaged, and the IC package is smoothly stored in the case. It has the effect of being done. In addition, the IC package body and the heat sink are positioned with respect to the receiving portion by the holding pieces,
It is held, and the IC package body and the heat sink are in close contact with each other.
There is no insulation resin entering between the package and the heat sink, and the heat of the IC package is smoothly transmitted to the heat sink.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view of an essential part showing an embodiment of the present invention, and FIG. 1B is a perspective view of an essential part showing another use mode of the connector terminal of FIG.

FIG. 2 is an electric circuit diagram of an ignition device for an internal combustion engine.

FIG. 3 is a side sectional view showing an example of a conventional ignition device for an internal combustion engine.

FIG. 4 is a left side view before the case of FIG. 3 is filled with an insulating resin.

[Explanation of symbols]

5 cases, 30 IC package bodies, 34 heat sinks,
35 receiving part, 36 holding piece, 37 partition plate, 45 guide.

Claims (2)

(57) [Scope of request for utility model registration] A power switch for intermittently supplying a primary current of an ignition coil and an ignition coil are integrated with each other, and the power switch is tightly sealed in an IC package body and a solid state IC package body.
The radiating plate attached is placed in a case filled with insulating resin.
In an internal combustion engine ignition device, and a receiving unit for receiving the IC package body and the heat radiating plate, the receiving portion
Receiving the IC package and the heat sink.
A holding piece for positioning and holding with respect to the clasp ,
The ignition device for an internal combustion engine, wherein the receiving part integrated with the IC package and the heat sink is guided along a guide formed in a case and housed in the case. 2. The internal combustion engine according to claim 1, wherein a partition plate for separating each terminal protruding from the IC package body and ensuring insulation between the terminals is provided at a tip end of the receiving portion. Ignition device.