JP3467702B2 - Engine ignition coil device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil device for an engine. 2. Description of the Related Art Recently, a plurality of coil units corresponding to the number of cylinders of an engine are arranged in one coil case without using a distributor, and the coil case and each coil unit are connected to each other. There has been developed an ignition coil device for an engine by a potting type in which a single piece is integrally formed. Conventionally, in an ignition coil device for an engine of this type, a secondary side of each coil unit housed in a coil case is connected to a high voltage terminal for external drawing by soldering or the like. The high-voltage terminal of each coil unit is integrally attached to the coil case by resin molding. [0004] The problem to be solved is that when the high voltage terminal of each coil unit is integrally mounted on the coil case side by resin molding, the secondary side of each coil unit is connected to the high voltage terminal. Due to variations in the connection state with the terminals, the installation locations of the high-voltage terminals may vary, or the high-voltage terminals may be attached at an angle, resulting in inconsistent products. According to the present invention, a plurality of coil units each having a core wound with a primary winding and a secondary winding are provided in a coil case, and the coil unit is provided with a plurality of coil units. When insulative resin is injected into the case and the resin is cured to form the coil case and each coil unit integrally, the location of the high-voltage terminals in each coil unit varies, A coil cover that fits into the coil case is provided so as to prevent the coil unit from being tilted, and sockets of the high-voltage terminals of each coil unit are respectively attached to predetermined positions of the coil cover. In particular, in the present invention, an insertion hole for the high-voltage terminal socket is formed at a predetermined position of the coil cover so that the high-voltage terminal socket does not rise when the resin is injected. A step is provided, and a projection provided on the high voltage terminal coupler side is engaged with the notch step to temporarily fix the high voltage terminal socket to the coil cover side. Further, according to the present invention, when the coil cover is fitted by being fitted into the inside of the coil case,
In order to prevent the resin injected into the case from leaking to the outside due to capillary action from the minute gap between them, a liquid pool is formed around the entire circumference of the coil cover to prevent the resin from leaking. . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An ignition coil device for an engine according to the present invention
As shown in FIGS. 1 and 2, after three coil units 2 (2A, 2B, 2C) are disposed in a coil case 1, an insulating resin is injected into the coil case 1, and The coil case 1 and the coil units 2 are integrally formed by curing the resin. A coil cover 3 fitted to the coil case 1 is provided. The high-voltage terminal socket 4 (411, 412, 421, 4) of the coil unit 2
22, 431, 432). When the high-voltage terminal socket 4 is attached to a predetermined position of the coil cover 3, a high-voltage terminal pin 5 protruding from the tip of the high-voltage terminal socket 4 is connected to a terminal of the high-voltage terminal provided on the coil unit 2 side. It is inserted into the receptacle 6 so that both can be electrically connected. A low-voltage terminal socket 7 of each coil unit 2 is formed integrally with the coil cover 3. FIG. 3 shows an electrical connection state in the ignition coil device. In the figure, HT1 to HT6 are secondary high voltage terminals of each coil unit 2, and LT1 to LT
Reference numeral 3 denotes a low-voltage terminal on the primary side of each coil unit 2, and G denotes a common terminal for ground on the primary side of each coil unit 2. In the present invention, when the high-voltage terminal socket 4 is attached to the coil cover 3, a hole 8 for inserting the socket tip 41 is formed at a predetermined position of the coil cover 3 as shown in FIGS. A notch step 9 is provided in the insertion hole 8, and a projection 42 provided on the socket tip 41 side is engaged with the notch step 9, and the high-voltage terminal socket 4 is temporarily fixed to the coil cover 3 side. I try to make it. As shown in FIGS. 5 and 6, a notch 91 is formed in the notch step 9 provided in the insertion hole 8, and the projection 42 on the socket tip 41 side is formed by the notch. After inserting the socket distal end portion 41 into the insertion hole 8 so as to pass through the 91, the high voltage terminal socket 4 is turned to lock the projection 42 below the stepped portion 92 of the cutout stepped portion 9. . Thus, according to the present invention, when the high voltage terminal sockets 4 of the respective coil units 2 disposed in the coil case 1 are mounted, the positions of the high voltage terminal sockets 4 may vary, or may be inclined. In order to prevent this, each high-voltage terminal socket 4 can be positioned at a predetermined position via the coil cover 3 and can be installed neatly. By simply attaching each high-voltage terminal socket 4 to a predetermined position of the coil cover 3, a high-voltage terminal pin 5 protruding from the tip of each high-voltage terminal socket 4 is provided on each coil unit 2. , Respectively, so that electrical connection between them can be easily and reliably established. Further, each high voltage terminal socket 4 can be easily temporarily fixed to the coil cover 3 side, and it is effective that each high voltage terminal socket 4 rises when resin is injected into the coil case 1. Is prevented. As shown in FIGS. 7 and 8, each coil unit 2 has an I-shaped core 11 mounted inside a primary coil bobbin 10 on which a primary winding is wound. A secondary coil bobbin 12 on which a secondary winding is wound is fitted outside the coil bobbin 10, and a U-shaped core 13 is attached to a portion of a core holding portion 101 integrally formed on the primary coil bobbin 10 side. Is installed. A part of the outer laminated plate is cut and raised on the side surface of the I-shaped core 11 made of a laminated iron core so as to have a spring property. A stopper 102 for positioning the I-shaped core 11 to be inserted is formed (see FIG. 9), and the tip of the I-shaped core 11 is formed on the stopper 102 against the resilience of the cut-and-raised piece 111. By inserting the cut-and-raised piece 111 into the bobbin side wall by inserting it into the hollow portion of the primary coil bobbin 10 until it comes into contact (see FIG. 10), the I-shaped core 11 is fixedly mounted at a predetermined position. The U-shaped core 13 has a core cover 1 made of relatively flexible polypropylene or the like which can absorb thermal strain generated in the core so that both end surfaces 131 are exposed.
Hooks 141 projecting from both ends of the core cover 14 engage with holes 103 formed in the core holding portion 101 of the primary coil bobbin 10 and are attached thereto (FIG. 11). reference). Then, the both end faces 131 of the attached U-shaped core 13 face the end faces of the I-shaped core 11 via predetermined gaps, respectively, to form a closed magnetic circuit type core. FIG. 12 shows an assembled state of the ignition coil device according to the present invention.
Each of the coil units 2 is placed at a predetermined position on the coil cover 3 to which the coil unit 2 is attached. Contact ends 151 which are respectively inserted into the ports 6 (see FIG. 1) and connected to the terminals LT1 to LT3 and G on the primary side in the low voltage terminal socket 7.
To 156, the lead 16 from the primary winding of each coil unit 2 is connected, and the coil case 1 is placed over the lead. The contacts connected to the terminals LT1 to LT3 and G on the primary side in the low voltage terminal socket 7 are structured as shown in part A of FIG.
The parts 51 to 156 are embedded in grooves formed in advance on the coil cover 3 so that the parts 51 to 156 are exposed to the outside. After assembling as described above, in the state shown in FIG. 1, molten resin is injected from the opening of the coil cover 3 to a line L indicated by a dotted line in the figure, and the resin is cured. The whole is integrally molded. At this time, as shown in FIG. 13, there is a gap ε between the coil case 1 and the coil cover 3 fitted so as to be fitted into the coil case 1, and the gap ε is injected into the case by capillary action from the gap ε. The molten resin leaks out. Therefore, according to the present invention, as shown in FIG. 14, a liquid reservoir 17 is formed on the entire circumference of the coil cover 3 so as not to become a capillary (see FIGS. 1, 2 and 12), and the coil case 1 is formed. To prevent the molten resin injected into the coil case 1 from leaking out of the coil case 1 from the gap ε between the coil case 1 and the coil cover 3. As described above, in the ignition coil device for the engine according to the present invention, each high-voltage terminal socket of the plurality of coil units 2 disposed in the coil case is mounted via the coil cover. Therefore, there is an advantage that each high-voltage terminal socket can be positioned at a predetermined position and can be installed neatly without the installation location being varied or being installed at an angle. In this case, in particular, according to the present invention , each high-voltage terminal socket can be easily temporarily fixed to the coil cover side, so that each high-voltage terminal socket rises when resin is injected into the coil case. Is effectively prevented, and the high voltage terminal socket can be securely mounted. Furthermore, according to the present invention, since a liquid pool is formed around the entire circumference of the coil cover to prevent the resin from leaking, the liquid between the coil case and the coil cover fitted so as to fit into the coil case is formed. There is an advantage that the resin injected into the case from the minute gap can be effectively prevented from leaking outside due to capillary action.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view showing one embodiment of an ignition coil device for an engine according to the present invention. FIG. 2 is a plan view of the ignition coil device of the engine in the embodiment. FIG. 3 is a diagram showing an electrical connection state of the ignition coil device of the engine in the embodiment. FIG. 4 is a front sectional view of a portion where the high-voltage terminal socket is attached to the coil cover. FIG. 5 is a plan view of an insertion hole of a high-voltage terminal socket provided in a coil cover. FIG. 6 is a rear view of a portion where the high-voltage terminal socket is attached to the coil cover. FIG. 7 shows a primary coil bobbin in the coil unit;
It is an exploded perspective view which consists of an I type core attached in a secondary side coil bobbin and a primary side coil bobbin. FIG. 8 shows a primary side coil bobbin in the coil unit;
It is an exploded perspective view which consists of an assembly of a secondary side coil bobbin and an I type core, and a U type core attached to it. FIG. 9 is a side cross-sectional view of a stopper portion formed on a core holding portion side for positioning an I-shaped core inserted into a primary coil bobbin. FIG. 10 is a side sectional view of a cut-and-raised piece of the I-shaped core inserted into the primary coil bobbin, which is cut into the bobbin side wall. FIG. 11 is a perspective view showing another configuration example of the primary coil bobbin and the I-shaped core in the coil unit. FIG. 12 is a perspective view showing an assembled state of the ignition coil device of the engine in the embodiment. FIG. 13 is a partial front sectional view showing a gap between a coil case and a coil cover fitted so as to be fitted therein. FIG. 14 is a partial cross-sectional front view of a coil case when a liquid reservoir is provided on the entire circumference of the coil cover and a coil cover that is mounted so as to be fitted therein. [Description of Signs] 1 Coil case 2 Coil unit 3 Coil cover 4 High voltage terminal socket 5 High voltage terminal pin 6 High voltage terminal socket 7 Low voltage terminal socket 8 Insertion hole 9 Notch step 17 Liquid pool

   ────────────────────────────────────────────────── ─── Continuation of front page       (56) References JP-A-60-86898 (JP, A)                 62-138428 (JP, U)                 62-1977827 (JP, U)                 52-145230 (JP, U)                 Actual opening 63-105318 (JP, U)

Claims (1)

(57) [Claim 1] A plurality of coil units in which a primary winding and a secondary winding are wound around a core are disposed in a coil case, and then the coil unit is disposed in the coil case. Insulating resin is injected into
In an ignition coil device for an engine in which a coil case and each coil unit are integrally formed by curing of the resin, a coil cover fitted to the coil case is provided, and a high-voltage terminal socket is provided at a predetermined position of the coil cover. the insertion hole is bored, the insert is provided a notch step portion in the hole, inserted into the insertion hole of the socket distal portion to pass through the notch projection provided on the high-voltage terminal socket side is formed in the notch step portion it has engaged so that projection on the lower side of the cutout step portion by turning the high voltage terminal socket state, whereupon together so as to temporarily fix the high-voltage terminal socket coil cover side
The coil cover into the coil case
The coil case and coil around the entire circumference of the coil cover.
Tree injected into the coil case from the gap with the cover
A liquid that prevents oil from leaking out due to capillary action
An ignition coil device for an engine, wherein a droop is formed .