JPH0351942Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to an ignition coil for igniting internal combustion engines such as automobiles and burners such as water heaters.

<Prior art> A primary terminal that connects the winding end side of the primary coil is held on the flange at the upper end of the bobbin of the primary coil, and a primary terminal is held on the flange at the upper end of the bobbin of the secondary coil that fits outside the primary coil. The primary side connection device for the ignition coil is provided with a connecting member for connecting the low voltage side of the secondary coil, and the connecting member and the primary terminal are brought into contact when both the primary and secondary coils are fitted together. The applicant proposed this in Utility Application No. 198644/1983.

The connecting member of the preceding proposal is linear, and is provided on the flange at the upper end of the bobbin of the secondary coil with one end protruding outward from the flange, and the low voltage side of the secondary coil is wound around the one end. The primary terminal contacts the other end of the connecting member by applying pressure from above.

<Problem to be solved by the invention> For this reason, one end of the connecting member that is connected by winding the low voltage side of the secondary coil is subjected to stress due to the pressure contact of the primary terminal, and the low voltage side of the connected secondary coil is There may be a disconnection.

<Means for Solving the Problems> Accordingly, the present invention provides a connection member that connects the low voltage side of the secondary coil to the outside that protrudes from the flange of the bobbin of the secondary coil and connects the low voltage side of the secondary coil. a connecting portion facing inward in the opposite direction to the connecting portion, a contact portion that contacts the primary terminal, an inner end of the connecting portion, and an outer end of the contact portion through a bent portion. and a connecting part that is connected to the main terminal, and a pillow part is provided on the upper surface of the flange of the bobbin of the secondary coil to lift the inner end of the contact part to float the contact part, and the primary terminal has a pillow part that lifts the inner end of the contact part to float the contact part. It is characterized in that it is provided with a grooved horizontal piece that engages the contact portion with a groove on the lower surface.

<Embodiment> In the illustrated embodiment, 1 is a bottomed case made of plastic, and the bottom end of the bobbin 2' of the primary coil 2 is inserted into a hole provided in the bottom of the case 1, and the hole is closed. Stand the primary coil 2 in the case,
A secondary coil 3 is concentrically fitted around the outer periphery, a molten thermosetting resin is cast into the case 1, and both coils are embedded and fixed in the hardened resin layer 4. After that, a part 5a of the iron core 5 is passed through the bobbin 2' of the primary coil, and the remaining part 5b of the iron core is combined with the iron core 5a outside the case to form a closed magnetic circuit (dotted line in FIG. 1), and then the whole The exterior resin layer 6
(double-dashed line in Figure 1).

Both the primary and secondary bobbins 2' and 3' are molded plastic products, and a cylindrical part 7 is provided in an extended manner on the flange at the upper end of the primary bobbin 2'. A terminal mounting piece 8 is provided that is connected to and extends outside the collar. The cylindrical portion 7 and the terminal attachment piece 8 each protrude upward from the upper surface of the case 1. The cylindrical part 7 is for preventing resin from flooding into the inner circumference of the primary bobbin during thermosetting resin casting, and after casting, the iron core 5a is
When passing through the terminal attachment piece 8, the other three sides other than the one side connected to the terminal attachment piece 8 may be removed. The terminal mounting piece 8 also has two vertical holes 8' into which the upright pieces A1 and B1 of the two approximately L-shaped primary terminals A and B are press-fitted from below and passed through.

Reference numeral 9 denotes a connecting member fixed on the collar 3'' at the upper end of the secondary bobbin 3', and in this embodiment, a 0.5 to 1.5 mm tin-plated copper wire is bent and formed into an S shape with corners. When the connecting member 9 is fixed on the collar 3″,
An outward connecting portion 9a whose outer end protrudes outside the collar and connects the low voltage side of the secondary coil thereto, and a connecting portion 9b which is provided facing inward opposite to the above connecting portion and contacts the primary terminal B. and a connecting portion 9c that is connected to the inner end of the connecting portion 9a and the outer end of the contact portion 9b via a bent portion 9'. In addition, in order to fix the connecting member 9, there is a support member 10 provided on the collar 3'' with a notch or a hole that supports the connecting member in the middle, and a support member 10 is provided on the collar 3'' to raise the contact portion 9b from the upper surface of the collar 3''. A pillow part 11 for lifting the inner end is integrally provided on the collar 3''.
In this way, the connecting member 9 is connected to the supporting part 10 and the pillow part 11.
It may be attached and fixed to the secondary bobbin 3' later, but it may also be fixed at the same time by insert molding when the secondary bobbin 3' is molded from plastic or the like.

The above-mentioned primary terminal B has a horizontal piece B2 with respect to the upright piece B1, and a groove 12 that opens downward.
A grooved horizontal piece B3 having an inverted T-shape is provided (FIG. 3), and this grooved horizontal piece B3 is bent at a right angle at the base. The groove 12 is for engaging the contact portion 9b of the contact member 9, and the primary terminal B is connected to the upright piece B.
1, the terminal mounting piece 8 is press-fitted into the hole 8' from below, and when the primary coil is fitted to the inner periphery of the secondary coil bobbin, the groove 12 engages the contact portion 9b from above.

Therefore, before pouring the resin 4 into the case 1, the upright pieces of the primary terminals A and B are press-fitted from below into the holes 8' and 8' of the terminal mounting piece 8 of the primary bobbin, respectively, to penetrate and hold them. , Wrap the electric wire 2A on the winding start side of the primary coil around the tip of the horizontal piece A2 of the primary terminal A, and wrap the electric wire 2B on the winding end side of the primary coil around the tip of the horizontal piece B2 of the primary terminal B, and fix by soldering etc. death,
In addition, a connecting member 9 fixed on the collar 3″ of the secondary bobbin
The electric wire 3A on the winding start side of the secondary coil is wound around the connecting portion 9a protruding outward from the collar and fixed by soldering or the like. Then, when the primary coil is fitted to the inner circumference of the secondary bobbin, the groove 12 of the bent horizontal grooved piece B3 of the primary terminal B presses down on the contact part 9b of the connecting member from above, ensuring electrical reliability. contact, whereby the low voltage side of the secondary coil is electrically connected to the primary terminal B.

In this state, both coils 2 and 3 are placed in a case, the lower end of the primary bobbin protruding downward from the secondary coil is inserted into the hole at the bottom of the case, and resin is poured as described above.

In addition, there is also a support 1 on the lower surface of the flange at the lower end of the secondary bobbin.
0 is provided and the metal pin 13 is supported by this, and the high voltage end side (winding end side) of the secondary coil is fixed to this by soldering etc., and when it is housed in the case 1, the high voltage It is brought into contact with the inner end of the terminal 14.

The above-mentioned connecting member 9 and terminal mounting piece 8 are buried in the exterior resin layer 6, and both primary terminals A and B are also buried in the exterior resin layer 6, leaving their upper ends, so that they are firmly fixed in an electrically insulating manner. .

In the illustrated embodiment, since the connecting portion 9c is crank-shaped, the connecting member 9 has an angular S-shape as a whole, and has bent portions 9' at four locations. As a result, even if the groove 12 of the grooved horizontal piece B3 of the primary terminal B presses down the contact portion 9b of the connecting member from above, the pressing force is absorbed by the bent portion 9' of the connecting member, and stress is applied to the connecting portion 9a. It's not big. Therefore, the risk of disconnection of the secondary electric wire is eliminated.

Note that the shape of the connecting member 9 is not limited to the S-shape shown in the drawings, but may be Z-shape or other shapes, for example.

<Effect of the invention> In the present invention, a wire is fixed to the upper surface of the flange of the bobbin of the secondary coil in order to connect the low-voltage side wire of the secondary coil and to contact the primary terminal connected to the winding end of the primary coil. The connecting member has an outward connecting part protruding from the collar of the bobbin of the secondary coil, an inward contact part opposite to the above connecting part, an inner end of the above connecting part, and an outer end of the contact part. The wire on the low voltage side of the secondary coil is connected to the connecting part facing outward, and the primary terminal connected to the end of the primary coil is connected to the connecting part facing inward from above. Since the primary terminal makes pressure contact with the contact part, the stress applied by the primary terminal to the contact part is absorbed by the connection part and the bend between the contact part and the connection part, and does not reach the low voltage side of the secondary coil connected to the connection part. do not have. Therefore, the low voltage side of the secondary coil will not be disconnected.

Further, the contact portion is suspended above the upper surface of the collar of the bobbin of the secondary coil by a pillow portion that lifts the inner end thereof, and the primary terminal has a grooved horizontal piece that crosses over the contact portion, and the lower surface thereof Since the contact portion is held in the groove and pressure is applied to the contact portion from above, the primary terminal and the connecting member can be brought into reliable contact.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an ignition coil according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the main parts of FIG. 1,
Figure 3 is an enlarged perspective view of one of the primary terminals;
2 is the primary coil, 2' is the primary bobbin, 2'' is the collar at its upper end, 3 is the secondary coil, 3' is the secondary bobbin,
3'' is a collar at its upper end, 9 is a contact member, 9a is a connection part that connects the low voltage side 2A of the secondary coil, 9b is a contact part of the primary terminal B, A is a primary terminal that connects the winding start side of the primary coil, B indicates a primary terminal to which the winding end side of the primary coil is connected.

Claims (1)

[Claims for Utility Model Registration] The upper end collar of the secondary coil bobbin holds the primary terminal that connects the end winding side of the primary coil to the collar at the upper end of the bobbin of the primary coil, and the upper end collar of the secondary coil bobbin fits outside the primary coil. A connection member is provided on the top of the ignition coil for connecting the low voltage side of the secondary coil, and the connection member and the primary terminal are brought into contact with each other when both the primary and secondary coils are fitted. In the device, the connecting member is provided with an outward connecting portion that protrudes from the collar of the bobbin of the secondary coil and connects the low voltage side of the secondary coil, and an inward facing opposite to the connecting portion, The upper surface of the flange of the bobbin of the secondary coil has a contact part that comes into contact with the primary terminal, a connecting part that is connected to the inner end of the connecting part and the outer end of the contact part via a bent part. A pillow part is provided to lift the inner end of the contact part to float the contact part, and the primary terminal is provided with a grooved horizontal piece that crosses over the contact part and engages the contact part with a groove on the lower surface. A primary side connection device for an ignition coil, characterized in that: