JPH0240302Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a power distribution device for an internal combustion engine, and more particularly to a power distribution device in which an ignition timing control device is installed.

[Conventional technology]

FIG. 1 is a plan view of a power distributor equipped with a conventional ignition timing control device known from Japanese Unexamined Patent Publication No. 54-11374, etc., and FIG. 2 is a partial cross-sectional view of FIG. 1. The ignition timing control device 1 is a housing 2 of a power distribution device.
It is fastened with a screw 5 via a spacer 4 onto a fixed base 3 fixed to a fixed base 3 . The ignition timing control device 1 is comprised of a case 11 with a detection coil 13 integrated therein, 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 driven and rotated by an internal combustion engine, has the same number of cylinders as the number of cylinders. A reluctor 7 having a protrusion is fixed. Therefore,
The amount of magnetic flux circulating around the detection coil 13 changes according to the change in the gap between the stator 8 and the reluctor 7, and the amount of magnetic flux circulating around the detection coil 13 changes based on the change in the amount of magnetic flux.
A voltage is induced in 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 for the power distributor shown in FIG. 1, and FIG. 4 is a sectional view taken along the line -- in FIG.

The ignition timing control device 1 includes a pair of terminals 18, 18 connected to the ignition coil, a cap 20 that covers the connection parts of the terminal 18, etc., and a pair of bushes for attaching the ignition timing control device 1 to a fixed base 3. 19 are provided. Further, the hole through which the rotor shaft 6 passes is formed by an annular detection coil 13 embedded in the case 11.
The wire end of the detection coil is connected to a connecting piece 17 via a connecting piece 14. On the other hand, a hybrid integrated circuit incorporating an IC and the like provided on a substrate 15 is connected to connection pieces 16 and 17 provided on the substrate 15, and this substrate 15 is mounted on the metal base 12. . The gel 21 is on the substrate 15.
This is an insulating coating for IC circuits.

In addition, the connection pieces 14, 16, 17 and the terminal 18
One end is covered with a cap 20 which is attached to the case 11 after welding and connection. metal base 1
2 and the case 11 are bonded together with an adhesive applied to the joint surface 22, and the gel 21 has a structure that does not leak.

A lead wire 23 connected to the evening coil is attached to the other end of the terminal 18.

FIG. 5 shows a perspective view of the spacer 4. The spacer 4 has the function of firmly fixing the ignition timing control device 1 to the fixed base 3 without interfering with the operation of the movable base 10, and also serves to prevent the heat generation of the heating element (primary current intermittent transistor) mounted on the metal base 12. The function of conducting and dissipating into the housing 2 through the surface,
It has a function of grounding a metal base 12 to which a ground terminal of a control circuit is connected to a housing 2 which is electrically grounded.

[The problem that the idea aims to solve]

When the ignition timing control device 1 with the above configuration is to be fastened and fixed to the fixed base 3 via the spacer 4, the spacer 4 is first set on the fixed base 3. Next, the ignition timing control device 1 is mounted, and the screws 5 are passed through and tightened. However, at this time, the spacer 4 may be misaligned, and the screw 5 may not pass through and be tightened, or the screw 5 may not fit into the spacer 4.
There is a problem if you tighten it without penetrating the inside.

JP-A-55-128664 and JP-A-56-6073 disclose a method in which a metal spacer is fixed and held in contact with a metal base using screws.
According to this conventional example, the screw tightening work for installing the ignition timing control device increases (there are two places: the ignition timing control device and the spacer, and the spacer and the fixing base), which worsens the assembly workability.

Although it is conceivable to form the spacer integrally with the metal base, this would complicate the shape of the metal base and lack productivity.

It is also possible to form the spacer and the metal base separately and then mold them together with resin or bond them together with adhesive. Adhesive may flow. If resin or adhesive flows between the two, they will be electrically insulated and the arm will lose its function. It is also thermally insulated and loses its heat dissipation function.

Furthermore, the dimensions of the mounting legs formed by the two spacers will be different in length, and the mounting posture will be tilted, which may make it impossible to obtain an appropriate ignition signal.

There is also a method of forming both from separate members and holding the spacer between the metal base and the mounting plate with your fingers and passing the screw through it, but this would require blind work in the narrow space of the power distribution device, and it would be difficult to drop the spacer. It may be difficult to find the screw holes, or the installation process may be difficult.

The purpose of the present invention is to eliminate the need for electrical or thermal insulation between the metal base and the metal spacer.
To improve the workability of assembling an ignition timing control device without impairing the manufacturability of a metal base and a metal spacer by making it possible to extremely easily fix the two separately formed together.

[Means to solve the problem]

The above purpose is to provide an elastic holding part that elastically holds a cylindrical metal spacer with one end surface in contact with the surface of the metal base around the hole in the metal base. This is achieved by forming it on the resin part to be formed.

[Effect]

In the present invention, since the metal spacer is elastically held by the elastic holding part formed in the resin case, there is no need to drop the metal spacer during installation, resulting in good workability. Since there is no need to hold down the spacer with your fingers, you can concentrate on finding the screw holes, which speeds up the assembly process.

Further, since the metal spacer does not need to be metal molded like the bush 19 in FIG. 2, the molding operation is simple and the mold type is also simple.

In this way, the present invention makes it easier to install the ignition timing control device in the power distribution device than any other method, and the number of parts is reduced because the metal spacer functions as both a reinforcing bush and a metal spacer. It is small and cheap.

Furthermore, since there is no need for resin molding or adhesive bonding, there is no electrical or thermal isolation between the metal base and the metal spacer, and there is no fear that the earthing function or heat dissipation effect will be inhibited.

〔Example〕

Ignition timing control device 24 of the present invention based on FIG.
The configuration of is explained in detail.

A resin case 25, a metal base 26, and a terminal 2
7 is integrally molded, and an IC is mounted on the metal base 26.
A board 28 with components mounted thereon and a power transistor 29 are attached. The circuit on this board 28, the detection coil 30, and the terminal 18 are connected by soldering, bonding wire 31, or the like. 32 is a gel.

FIG. 7 is a sectional view of the ignition timing control device 24 according to the present invention, which corresponds to the - section in FIG.
A hole 251 into which a spacer 33 for fixing to the fixed base 3 can be fitted is provided in the case 25, and several ribs 252 are provided on the inner periphery of the hole 251.

Therefore, when trying to fix the ignition timing control device 24 to the fixed base 3 with screws, the spacer 33 can be lightly press-fitted into the hole 251 of the case 25 to integrate it in advance, so that the intended purpose can be achieved. can be achieved.

9 and 10 show another embodiment in which a flat part 253 whose width is slightly narrower than the outer diameter of the spacer 33 is provided on the inner periphery of the hole 251, and a recess is formed on the outside so that it can be easily deformed with elastic force. 254 is provided. FIG. 11 shows another embodiment of a spacer 34 having a knurl 341 on its outer periphery, the purpose of which is to be able to be press-fitted and integrated into the case 25.

In either case, a spacer is lightly press-fitted into a case made of resin, and screws can be tightened to the fixed base 3 easily and reliably.

[Effect of idea]

As detailed above, the present invention provides a power distributor equipped with an ignition timing control device that is easy to assemble, has a small number of parts, has a simple shape, has good electrical characteristics, and has an excellent heat dissipation effect. be able to.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a power distributor equipped with a conventional ignition timing control device, Fig. 2 is a sectional view of the main part of Fig. 1, and Fig. 3 is a plan view of a conventional ignition timing adjustment device. 4 is a sectional view of FIG. 3, FIG. 5 is a perspective view of the spacer, FIG. 6 is a sectional view of the ignition timing control device according to the present invention, and FIG. 7 is a sectional view of the mounting portion of the ignition timing control device according to the present invention. , FIG. 8 is a bottom view of the mounting hole in FIG. 7, FIG. 9 is a bottom view of the mounting hole in another embodiment corresponding to FIG. 8, FIG. 10 is a cross-sectional view of FIG. The figure is a partial sectional view of a spacer showing another embodiment. 1...Ignition timing control device, 3...Fixed base,
4... Spacer, 12... Metal base, 25...
Case, 28...board, 31...bonding wire.

Claims (1)

[Claims for Utility Model Registration] 1. A metal base as a heat dissipation member, an ignition timing control circuit mounted on the metal base, and a resin member that cooperates with the metal base to form a case for the ignition timing control circuit. an ignition timing control device located between the metal base and a mounting surface in the power distributor, the ignition timing control device being placed on the mounting surface in the power distributor and forming a heat radiation path from the metal base; a cylindrical metal spacer, extending through a hole formed in the metal base and a hole in the cylindrical metal spacer to a mounting surface of the power distributor, and screwing the ignition timing control device onto the mounting surface of the power distributor; In the device equipped with a through-bolt that is fastened and fixed, an elastic holding part that elastically holds the cylindrical metal spacer with one end surface thereof in contact with the surface of the metal base around the hole of the metal base is provided in the resin part. A power distributor with an ignition timing control device, characterized in that: 2 Utility Model Registration Scope of Claims 1. The ignition timing control device according to claim 1, characterized in that the holding part comprises a cylindrical part formed in the resin part and a rib formed on the inner wall of the cylindrical part. power distributor. 3 Utility Model Registration Claims Claim 1, wherein the holding part is formed on a cylindrical part formed in the resin part, a flat part formed on the inner wall of the cylindrical part, and an outer peripheral part of this flat part. A power distributor with an ignition timing control device, characterized in that the flat portion is configured with an elastic deformation receiving gap. 4 Utility Model Registration Claims Claim 1, wherein the holding part is composed of a cylindrical part formed in the resin part and a knurled part formed around the cylindrical metal spacer. A power distributor with an ignition timing control device.