JPS6160581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power distribution device for an automobile internal combustion engine, and particularly to the configuration of an ignition timing control unit.

Hybrid integrated circuit devices for controlling ignition timing have come to be installed in power distribution devices for internal combustion engines, but the circuit board on which this hybrid integrated circuit device is installed is attached to a metal base and sealed in a synthetic resin case. Covered.

FIG. 1 is a plan view of a power distributor equipped with a conventional ignition timing control unit, and FIG. 2 is a sectional view taken along line AB in FIG. The ignition timing control unit 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 unit 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 that is rotatably fitted to the fixed base 3, and a rotor shaft 6 that is rotated by the internal combustion engine has four protrusions. A reluctor 7 is fixed. Therefore, as the gap between the stator core 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.

3 is a plan view of the ignition timing control unit of the power distributor shown in FIG. 1, and FIG. 4 is an enlarged cross-sectional view taken along line CD in FIG. 3. A pair of terminals 1 connected to the ignition coil
8. Cap 2 that covers the connection parts such as terminal 18
0, fix this ignition timing control unit 1 to the base 3
A pair of bushings 19 are provided for attachment to. Further, a detection coil 13 is embedded in the case 11 around the hole through which the rotor shaft 6 passes, and its conductive wire end is connected to a connection piece 17 via a connection piece 14 . On the other hand, a hybrid integrated circuit incorporating an IC or the like is provided on a substrate 15 and connected to connection pieces 16 and 17, and this substrate 15 is mounted on the metal base 12. gel 2
Reference numeral 1 insulates and covers the IC circuit on the substrate 15. Note that after the other ends of the connecting pieces 14, 16, 17 and the terminal 18 are welded and connected, the cap 20 is
installed and covered.

In the ignition timing control unit configured as described above, the case 11 and the metal base 12 shown in FIG.
The connection was made by applying an adhesive to the bonding surface 22, and then press-fitting it using a glue, and with the glue attached, putting it in a drying and heating oven to strengthen and fix it. Therefore, in the past, it took a long time to install the wires, and the heat capacity increased due to the wires, and the number of pieces accommodated in the furnace decreased.

Note that, for example, Japanese Patent Application Laid-Open No. 113734/1983 discloses related technology.

The purpose of the present invention is to provide an ignition timing control unit for a power distribution device suitable for improving work efficiency and saving energy. The case is formed by providing a protrusion with a tapered rib and forcibly press-fitting it into a hole in the metal base, and airtightly integrating the case and the metal base with an adhesive.

FIG. 5 is a cross-sectional view of an ignition timing control unit according to an embodiment of the present invention, and is an enlarged view corresponding to the section EF in FIG. 3. A plurality of protrusions 23 are provided on the lower surface of the case 11, and are forcibly inserted into holes 26 formed in the metal base 12 and fixed.

FIG. 6 is an enlarged view of the protrusion shown in FIG. 5, and FIG. 7 is a bottom view of FIG. Case 1 around protrusion 23
A concave portion 24 is provided on one surface, and four tapered ribs 25 are provided around the cylindrical projection 23. When the synthetic resin case 11 is closely fixed on the metal base 12 to which the ignition timing control circuit is attached, adhesive is applied to the lower surface of the case 11 and the projections 23 are press-fitted into the holes 26 of the metal base 12.
Since the case 11 is made of synthetic resin, the ribs 25 of the projections 23 are deformed while being cut into the holes 26, and even if there is an error in the pitch of the holes 26 and the projections 23, they can be closely fitted. Incidentally, since the thin piece of synthetic resin scraped off at this time is pushed into the recess 24, the metal base 12 and the lower surface of the case 11 can be brought into close contact. Note that the recess 2
The surface 4 is given a curvature so that the strength of the protrusion 23 is not reduced.

In this way, the metal base 12 and the case 11 are hermetically bonded with an adhesive and no heat is used, so a larger number of ignition timing control units 1 than before can be accommodated in the drying and heating furnace. I can do it. Therefore, work efficiency is greatly improved. In addition, it does not require thermal energy to heat the heat source as in the past, resulting in energy savings. Furthermore,
Another advantage is that only a small amount of adhesive is required to be applied to the lower surface of the case 11.

The ignition timing control unit of this embodiment has a plurality of protrusions with tapered ribs formed on the bottom surface of the case, and is inserted into the hole of the metal case and bonded, thereby eliminating the need for labor during the bonding process. High efficiency,
In addition, it is possible to achieve an energy-saving and airtight integration.

The ignition timing control unit for a power distributor according to the present invention has the effect of improving assembly work efficiency and achieving the purpose of energy saving.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a power distributor equipped with a conventional ignition timing control unit, Fig. 2 is a sectional view taken along line A-B in Fig. 4 is an enlarged cross-sectional view taken along the line C-D in FIG. 3, and FIG. 5 is a cross-sectional view of an ignition timing control unit according to an embodiment of the present invention, which is an enlarged view corresponding to the cross-section EF in FIG. 3. , Figure 6 is an enlarged view of the protrusion in Figure 5, Figure 7 is an enlarged view of the protrusion in Figure 5;
The figure is a bottom view of FIG. 6. DESCRIPTION OF SYMBOLS 1...Ignition timing control unit, 2...Housing, 3...Fixed base, 10...Movable base, 1
DESCRIPTION OF SYMBOLS 1... Case, 12... Metal base, 13... Detection coil, 14, 16, 17... Connection piece, 15...
... Board, 18 ... Terminal, 19 ... Button, 20
... Cap, 21 ... Gel, 22 ... Joint surface,
23...protrusion, 24...recess, 25...rib, 2
6...hole.

Claims (1)

[Claims] 1. A detection coil that detects ignition timing in synchronization with the rotation of an internal combustion engine, a hybrid integrated circuit device that controls ignition timing by inputting a signal from the detection coil, and this hybrid integrated circuit device. In an ignition timing control unit for a power distribution device, the ignition timing control unit is composed of a case made of a synthetic resin material that airtightly covers a metal base on which a metal base plate is attached. An ignition timing control unit for a power distributor, characterized in that the unit is forcibly press-fitted into a hole in a metal base and airtightly integrates the case and the metal base via an adhesive. 2. The ignition timing control unit for a power distributor according to claim 1, wherein the projection is a boss projecting from the center of a recess formed on the lower surface of the case.