JPS5929773A - Ignition timing control unit - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of an ignition timing control unit by providing a rotary IC base plate on a metal base integrally fixed to the bottom surface of a recess in a case for supporting a detecting coil to fill the recess with gel by wire bonding the coil terminal. CONSTITUTION:A metal base 26 and a terminal 27 are integrally formed on the bottom surface of a recess 23 formed in the bottom surface of a resin case 24. A substrate 30 having IC, power transistors and other elements attached is bonded to the metal base 26. A detecting coil 28 wound around a bobbin 281 is mounted on the case 24 and an end 29 of the coil 28 is wire bonded to a terminal of the substrate 30. Then, a recess 23 including wire bonding portion is filled with gel 33. Thus, the manufacture of this unit is simplified and man hour is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition timing control device used, for example, in a power distribution device for an automobile internal combustion engine.

The power distributor for internal combustion engines is equipped with a hybrid integrated circuit device for ignition timing control, and the circuit board that makes up this hybrid integrated circuit device is attached to a gold-plated base and integrated with a synthetic resin case to form the main body of the power distributor. installed on.

FIG. 1 is a plan view of a power distributor equipped with a conventional ignition timing control device, and FIG. 2 is a sectional view taken along line II--II in FIG. 1. The ignition timing control device 1 is fastened with screws 5 via spacers 4 onto a fixed base 3 fixed to a housing 2 of a power distributor. The ignition timing control device 1 is composed of a case 11 in which a detection coil 13 is integrated, a metal base 12 to which a substrate forming a hybrid integrated circuit is attached, and the like.

On the other hand, a magnet 9 and a stator core 8 are attached to a movable base 10 which is rotatably fitted to the fixed base 3, and a rotor shaft 6, which is rotated by the internal combustion engine, has the same number of cylinders as the number of cylinders. A reluctor 7 having a protrusion is fixed. Therefore, as the gap between the stator 8 and the reluctor 7 that face each other changes, the amount of magnetic flux circulating around the detection coil 13 changes, and a voltage is induced in the detection coil 13.

This voltage change is input to the hybrid integrated circuit to perform the desired ignition timing control action.

Fig. 3 is a plan view of the ignition timing control device of the power distributor shown in Fig. 1;
FIG. 4 shows a sectional view taken along the line IV--IV in FIG. 3.

A cap 20 that covers connection parts such as a pair of terminals 18 connected to the ignition coil, and a pair of bushes 19 for attaching the ignition timing control device 1 to the fixed base 3 are provided. Further, a detection coil 13 wound around a bobbin 131 is placed around the hole through which the rotor shaft 6 passes through the case 11.
The conductive wire end portion thereof is connected to the connecting piece 17 via the connecting piece 14r. On the other hand, a hybrid integrated circuit incorporating an IC or the like is provided on a substrate 15 and a connecting piece 16.
17, this board 15 is connected to the metal base 12.
installed on top. Then, on this substrate 15 there is an I
It is filled with gel 21 for completely insulating the C circuit. The other ends of the connecting pieces 14, 16, 17 and the terminal 18 are connected by bath contact and then covered with a cap 20.

In the ignition timing control device configured in this manner, the case 11 and the metal base 12 are connected by applying adhesive to the joint surface 22, and then applying pressure to the case 11 using a screw, and then attaching the screw to the case 11. It was dried using leeches and placed in a solar oven to harden and harden. Therefore, a lot of effort and time in gluing work? : It had disadvantages such as:

The present invention has been made in view of these points,
The present invention provides an ignition timing control device for a power distributor suitable for improving work efficiency and saving energy.

In order to achieve such an object, the present invention integrally fixes a metal base to the bottom of a recessed part of a case that supports the detection coil, mounts an IC circuit board on this metal base, and also provides the detection coil ZM. A portion is wire-bonded to the substrate, and a recessed portion of the case is filled with gel to enclose the bonded portion and the substrate.

Hereinafter, the present invention will be explained in detail using Examples.

FIG. 5 is a sectional view showing an embodiment of the ignition timing control device according to the present invention, and FIG. 6 is a bottom view thereof. A metal base 26 and terminals 27 are integrally molded into the resin case 24. The metal base 26 and the terminals 27 are integrally molded within a recess formed on the bottom surface of the case 24.

A substrate 30 with ICs and other elements mounted thereon, and a power transistor 32 are bonded to the metal base 26. The detection coil 28 wound around the bobbin 281 is connected to the case 2.
4, and its coil end 29 is connected to the terminal of the board 30. The connection method is such that the coil end 29 is wire-bonded to the substrate 30. The recessed portion of the case 24 on which the metal base 26, the terminal 27, the substrate 30, the power transistor 32, etc. are mounted is filled with gel 33, including the wire bonding metal.

With this configuration, conventionally, in order to integrate the case body 11 and the metal base 12 and to prevent the gel 21 from leaking, it was necessary to completely apply adhesive to the joint surface 22. Such a thing becomes unnecessary. In addition, the substrate 30
Since it is fixed to the bottom of the concave portion of the beam 24, all wire bonding methods can be used to connect the detection coil 28 to the coil end 29, instead of the conventional welding method using a lead frame. This makes the work much easier than before.

It should be noted that if the metal base 26 is configured to be extended and directly screwed and fixed to the mating member, it is not necessary to attach the bushing 19 and stable fC identification can be achieved.

As is clear from the above description, the ignition timing control device according to the present invention can improve work efficiency and save energy.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional power distribution device for internal combustion engines;
FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a plan view of the ignition timing control device used in the internal combustion engine power distribution device.
4 is a sectional view taken along the line ■-■ in FIG. 3, FIG. 5 is a sectional view showing an embodiment of the ignition timing control device according to the present invention, and FIG. 6 is a sectional view of the ignition timing control device shown in FIG. It is a bottom view. 1... Ignition timing control device, 2... No-Using, 3
...Fixed heath, 10...Movable heath, 11.24
...Case, 12.26...Metal base, 13.2
8...Detection coil, 15.30...Substrate, 18,1
．． 7...terminal, 19...button, 21.33...
- Kel, 22... Bonding surface, 31... Bonding wire. 447-- Rod 3 figure

Claims (1)

[Claims] 1. A metal base is integrally fixed to the bottom of the concave part of the case that supports the detection coil, an IC rotating board is mounted on this metal base, and the end of the detection coil is wire-bonded to the board. An ignition timing control device, characterized in that a recessed portion of the case is filled with gel so as to enclose the ignition timing control device and the substrate.