JPH088125A - Ignition device incorporating power switching module - Google Patents

Abstract

PURPOSE:To provide an ignition device incorporating a small and low-cost power switching module wherein the production process can be simplified. CONSTITUTION:An ignition device comprises a primary bobbin 40 having a primary winding 42, a secondary bobbin 80 having a secondary winding 82 and disposed round the bobbin 40, a core disposed in the bobbin 40, and a power switching module 40 for turning on and off a primary current. This module and windings 42 and 82 are buried in a case 50. A holder 10 which holds this module and a primary connector 20 to input a primary voltage are formed into a unified body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine ignition device,
In particular, it relates to an ignition device incorporating a power switching module.

[0002]

2. Description of the Related Art In an ignition device for an internal combustion engine, particularly for an ignition device for an automobile, a power switching module composed of a power transistor or the like is provided inside a case of the ignition device because of a space for arranging parts, wiring and the like. Various arrangements have been proposed. As an example of this, FIG. 3 shows a cross-sectional view of a conventional ignition device with a built-in power module.

In FIG. 3, reference numeral 40 denotes a substantially rectangular tube-shaped primary bobbin around which a primary winding 42 is wound, and a secondary bobbin 80 around which a secondary winding 82 is wound is arranged on the outer periphery thereof. The primary bobbin 40, the secondary bobbin 80, etc. are housed in a resin-molded insulating case 50. In addition, the primary winding 42
The winding end 41 of the secondary winding 82 is connected to the primary connector 20, and the winding end of the secondary winding 82 is connected to the high voltage output portion (secondary terminal) 84. The primary connector 20 is also connected to a power switching module 30, and in the case 50, the primary bobbin 40, the primary winding 42, and the secondary bobbin 80,
The secondary winding 82, the primary connector 20, the secondary terminal 84, and the power switching module 30 are embedded and integrated by injecting and curing the resin 60. Further, iron cores 70-70 are inserted into the internal space of the rectangular tubular primary bobbin 40.

A holder portion 10 for holding the power switching module 30 is provided inside the case 50 as a part of the case 50. Since the power switching module 30 has a very high temperature during operation of the ignition device, a heat dissipation member 36 is closely attached to the switching module 30 for heat dissipation, and cracks are present between these and the holder portion 10. A cushioning material 90 such as rubber or silicone is provided for prevention.

[0005]

The procedure for manufacturing the conventional ignition device having the above-described structure is as follows: the power switching module 30, the primary connector 20, and the primary coil 40 are fixed in the case 50, and then the power switching module. Since the connection between the wire 30 and the primary connector 20 and the winding end portion 41 of the primary winding 42 is performed, the assembly workability associated with this connection work is extremely poor, and the wiring is complicated. Therefore, extra lead terminals or lead wires are required.

Further, in order to perform the wiring work, the power switching module 30 and the primary connector 20, 1
The fact that the next coil 40 cannot be vertically stacked on the opening surface of the case 50 and that the respective components cannot be stacked directly as described above causes an inconvenience in downsizing of the ignition device body.

Further, since the heat dissipation member 36 attached to the power switching module 30 is directly disposed on the holder portion 10, the case 50 and the resin 60 are different from each other in expansion and contraction due to the difference in expansion and contraction between the case 50 and the resin. Since cracks easily occur in 60, the cushioning material 90 must be provided so as to surround the heat dissipation member 36 as a countermeasure against this.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an ignition device which has a built-in power switching module 30 which can be simplified in manufacturing process and is small in size and inexpensive.

[0009]

In order to solve the above problems, according to the present invention, a primary bobbin 40 having a primary winding 42 and a secondary winding 82 provided on the outer circumference of the primary bobbin 40 are provided. Secondary bobbin
80 is arranged, and the iron core 70 is arranged on the primary bobbin 40.
Power switching module that conducts and cuts off the next current
In the ignition device in which the case 30, the primary winding 42, and the secondary winding 82 are embedded in the case 50, the holder portion 10 for holding the power switching module 30 and the primary connector 20 for inputting the primary voltage It is an ignition device with a built-in power switching module.

In the above, the holder part which is integrated
10 and the primary connector 20 are fixed to the primary bobbin 40,
The terminal portions 32 and 33 of the power switching module 30 are arranged on the extension lines of the terminal portions 22 and 23 of the primary connector 20, and the winding end portions 41 of these primary windings are connected to the terminal portion 31 of the power switching module 30. The power switching module 30 is connected to the power switching module 30, and the power switching module 30 is formed into a tubular shape so as to enclose the power switching module 30. Also, the power switching module 30 has a terminal portion where the terminal portions 31, 32, and 33 are arranged. Ribs 11 and 12 may be provided so as to partition 31 and 32 and 33, and holder portion 10 in which terminal portions 31 and 32 and 33 of power switching module 30 are not arranged in case 50
A rib 56 for closing the opening may be provided.

[0011]

With the above configuration, the terminal portions 31, 32, 33 of the power switching module 30 and the terminal portion 22 of the primary connector 20 are
The wires 23, 24 and the winding end portions 41-41 of the primary winding 42 can be connected outside the case 50, and these are arranged in the case 50 as an integrated part after the assembly is completed.

Terminal part of the power switching module 30
32 and 33 can now be arranged on the extension lines of the terminals 22 and 23 of the primary connector 20.
The 30 can be arranged at a position where the primary connector 20 and the opening surface of the case 50 are directly overlapped with each other. Further, the winding end portion 41 can be directly wound and connected to the terminal portion 31 of the power switching module 30.

Ribs 11 and 12 provided in the opening of the holder 10
Are terminal portions 31 and 32 of the power switching module 30,
33, the terminal portions 22 and 23 of the primary connector 20, and the winding terminal portion 41 of the primary winding 42 are prevented from being short-circuited between the adjacent terminal portions. Since the strength of the holder is increased, the holder 10 can be prevented from being deformed.

Further, since the holder portion 10 has a tubular shape so as to surround the power switching module 30 and the heat radiation member 36, the rubber cushioning material 90 as described in "Prior Art" is not required. In addition, since the rib 56 provided on the case 50 closes one opening of the holder portion 10, cracking of the insulating resin 60 can be prevented.

[0015]

1 is a sectional view of an ignition device according to an embodiment of the present invention, and FIG. 1 shows the power switching module.
FIG. 2 shows a diagram of an assembly assembly of 30, the heat dissipation member 36, the holder portion 10, the primary connector 20, the primary winding 42, and the like.

Of the parts constituting the ignition device in FIG. 2, those which are the same as or correspond to those described in FIG. 3 showing the “prior art” will be omitted.
2 shows the power switching module 30 and the heat dissipation member 36,
The figure of the assembly assembly of the holder part 10, the primary connector 20, the primary winding 42, etc. is shown, and the primary winding is attached to the primary bobbin 40.
After winding 42, one winding end portion 41 of this primary winding 42
Is connected to the terminal portion 31 of the power switching module 30, and the other winding end portion 44 is connected to one terminal portion 24 of the primary connector 20. The other two terminal portions 32 and 33 of the power switching module 30 are connected to the other terminal portions 22 and 23 of the primary connector 20, respectively.
The power switching module 30 is fixed by a holder portion 10, and the holder portion 10 is formed integrally with the primary connector 20. Further, the integrally molded parts of the holder portion 10 and the primary connector 20 are fitted to the primary bobbin 40 to be integrated. That is, the power switching module 30, the holder portion 10, the primary connector 20 and the primary bobbin 40 are integrated parts.

A sectional view of FIG. 2 is shown in FIG. 1. A heat radiating member 36 is provided between the holder portion 10 and the power switching module 30 in consideration of heat generation of the power switching module 30. Further, the holder portion 10 has a cylindrical shape that surrounds the power switching module 30 and the heat dissipation member 36, both ends of the holder portion 10 are open, and the terminal is opened from this one opening portion. Parts 31 and 32, 33
The power switching module 30 is inserted at the top, and the terminal portions 31, 32, and 33 project from the other openings, and the terminal portions 31 and 32, 33 are respectively partitioned into the holder portion 10 so as to be independent. Ribs 11 and 12 are provided.

FIG. 1 shows a sectional view of the assembly in a case 50. In FIG. 1, the primary winding 42
A secondary bobbin 80 around which a secondary winding 82 is wound is arranged around the outer periphery of the secondary winding 82, and the winding end of the secondary winding 82 has a secondary terminal 84.
It is connected to the. The case 50 is made of resin, and a rib 56 is provided in the case 50 so as to close one opening of the cylindrical holder portion 10. The case
50 is the power switching module 30 and the primary winding
The assembly composed of 42 etc., the secondary bobbin 80, the secondary winding 82, the secondary terminal 84, etc. are embedded, the resin 60 is injected and hardened, and the iron core 70-70 is placed in the internal space of the primary bobbin 40. It is inserted and constitutes an ignition device.

[0019]

As described above, the terminal portions 31, 32, 33 of the power switching module 30 and the terminal portion 22 of the primary connector 20 are
Since the connection between the winding ends 23 and 24 and the winding end portions 41 and 44 of the primary winding 42 is performed outside the case 50, workability can be improved and the primary connector 20 and the primary connector 20 integrated with the holder portion 10 can be achieved. The winding 42 is placed in the case 50 after completing the respective wirings in the assembled state, so that the number of assembling steps of the internal combustion engine ignition device can be reduced.

Further, since the terminals 32 and 33 of the power switching module 30 can be arranged on the extension lines of the terminals 22 and 23 of the primary connector 20, the terminals 22 and 23 of the primary connector 20 can be arranged.
Since the power switching module 30 is arranged at a position where the power switching module 30 and the opening surface of the primary connector 20 and the opening surface of the case 50 overlap with each other, the size of the ignition device main body can be easily reduced. Further, the winding end portion 41 of the primary winding 42 is connected to the terminal portion 31 of the power switching module 30.
Since the wires can be directly wound around and connected to the terminals, the number of parts of the terminal parts can be minimized.

Ribs 11 and 12 provided in the opening of the holder 10
Are terminal portions 31 and 32 of the power switching module 30,
33 and the terminal portions 22 and 23 of the primary connector 20 and the winding end portion 41 of the primary winding 42 are prevented from short-circuiting each other between adjacent terminal portions, and the cylindrical holder portion 10 Since the strength of the holder part 10 can be increased and the holder part 10 can be prevented from being deformed, the workability of the connection is improved and the holder part 10 is easily molded.

Further, since the holder portion 10 has a tubular shape so as to surround the power switching module 30 and the heat radiation member 36, the rubber cushioning material 90 as described in "Prior Art" is used. It is possible to prevent cracks from occurring in the insulating case 50, and the ribs 56 provided on the case 50
Since one opening of the holder portion 10 is closed with, it is possible to prevent cracking of the insulating resin 60.

[Brief description of drawings]

FIG. 1 is a sectional view of an ignition device showing an embodiment of the present invention.

FIG. 2 is a diagram showing an assembly assembly of a power switching module 30, a heat radiating member 36, a holder portion 10, a primary connector 20, a primary winding 42, etc. of the ignition device of the present invention.

FIG. 3 is a sectional view of an ignition device incorporating a conventional power switching module.

[Explanation of symbols]

 In the drawings, the same reference numerals indicate the same or corresponding parts. 10 Holder Part 11, 12 Rib 20 Primary Connector 22, 23, 31, 32, 33 Terminal Part 30 Power Switching Module 36 Heat Dissipating Member 40 Primary Bobbin 41 Winding End 42 Primary Winding 50 Case 60 Resin 70 Iron Core 80 Secondary bobbin 82 Secondary winding 84 Secondary connector 90 Cushioning material

Claims (7)

[Claims] 1. A primary bobbin to which a primary winding is applied, and a secondary bobbin to which a secondary winding is applied are arranged around the primary bobbin,
An iron core is arranged on the primary bobbin, a power switching module for conducting and blocking a primary current, and the primary winding,
An ignition device in which a secondary winding is embedded in a case, wherein a holder portion holding the power switching module and a primary connector for inputting a primary voltage are integrally molded. 2. A power switching module built-in ignition device according to claim 1, wherein the integrated holder part and primary connector are fixed to the primary bobbin. 3. The ignition device with a built-in power switching module according to claim 1, wherein the terminal portion of the power switching module is arranged on an extension line of the terminal portion of the primary connector. 4. The ignition device with a built-in power switching module according to claim 1, wherein a winding end portion of the primary winding is connected to a terminal portion of the power switching module. 5. The ignition device with a built-in power switching module according to claim 1, wherein the holder portion is formed into a tubular shape so as to enclose the power switching module. 6. The ignition system with a built-in power switching module according to claim 1, wherein a rib is provided in the opening of the holder portion where the terminal portion of the power switching module is arranged so as to partition the terminal portion of the power switching module. apparatus. 7. The ignition device with a built-in power switching module according to claim 1, wherein a rib for closing an opening of a holder portion in which the terminal portion of the power switching module is not arranged is provided in the case.