JPH0314032Y2 - - 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 secondary coil is fitted outside the primary coil, and the winding start side of the primary coil is connected to one of two primary terminals held on the collar at the upper end of the bobbin of the primary coil, and the winding start side of the primary coil is connected to the other side. A primary side connection device for an ignition coil that electrically connects the winding end side and the low voltage side of the secondary coil is known from Japanese Utility Model Application No. 59-89521 proposed by the present applicant.

<Problems to be solved by the invention> In the above conventional example, the winding start side of the primary coil is connected by soldering or welding to one of the two primary terminals held in the collar at the upper end of the primary coil bobbin, and the winding start side of the primary coil is connected to the other by soldering or welding. The end of the primary coil is connected to the low voltage side (starting end of the winding) of the secondary coil to a tin-plated copper wire with a diameter of about 0.1 to 1.0 mm, which is connected by soldering or welding. In this way, soldering or welding is required twice to process the terminal on the low voltage side of the secondary coil, which takes time and effort, and increases the cost of the product.

<Means for Solving the Problems> Therefore, the present invention involves fitting a secondary coil outside the primary coil, and winding the primary coil around one of the two primary terminals held on the collar at the upper end of the bobbin of the primary coil. In a primary side connection device for an ignition coil that electrically connects the winding start side of the primary coil to the other side, the end winding side of the primary coil, and the low voltage side of the secondary coil, the secondary coil is connected to the flange at the upper end of the bobbin of the secondary coil. A connecting member is provided to connect to the low voltage side of the primary coil, and the other of the primary terminals connecting the connecting member and the winding end side of the primary coil is connected to the primary,
It is characterized in that both secondary coils come into contact when fitted.

<Function> According to the present invention, when the low voltage side of the secondary coil is connected to the connecting member on the secondary coil bobbin and the secondary coil is fitted around the outer periphery of the primary coil, the end of the primary coil connected to the end of the primary coil is connected to the connecting member on the secondary coil bobbin. The other primary terminal of the bobbin contacts the connection member and is electrically connected.

<Embodiments> In each of the illustrated embodiments, reference numeral 1 denotes a bottomed case made of plastic, through which the lower end of the bobbin 2' of the primary coil 2 is inserted through a hole provided in the bottom, and the hole is closed. , the primary coil 2 is placed in a case, and the secondary coil 3 is fitted concentrically around its outer periphery.
Molten thermosetting resin is poured into case 1,
Both coils are buried and fixed in the cured resin layer 4. Thereafter, 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 (see the dotted line in Figs. 1 and 4). ), and then the whole is covered with an exterior resin layer 6 (two-dot broken line in FIGS. 1 and 4).

Both the primary and secondary bobbins 2' and 3' are molded plastic products, and a cylindrical part 7 is provided on the flange at the upper end of the primary bobbin 2', and one side of the cylindrical part 7 is connected to the upper surface of the flange. A terminal mounting piece 8 is provided that protrudes 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 portion 7 is used to prevent resin from flooding into the inner periphery of the primary bobbin during thermosetting resin casting, and when penetrating the iron core 5a, other than the one side where the terminal mounting piece 8 is connected, the cylindrical portion 7 is provided. You can also cut out the other three sides of . The terminal mounting piece 8 has a vertical hole 8' for press-fitting the upright pieces A1 and A2 of the two approximately L-shaped primary terminals A and B from below and passing them through.
It has two.

In the first embodiment shown in FIGS. 1 to 3, a metal pin as a connecting member 9 connected to the low voltage side of the secondary coil 3 is mounted on the collar 3'' at the upper end of the secondary bobbin, for example, a metal pin with a diameter of 0.1 to
A 1.5mm tin-plated copper wire is suspended from the top of the tsuba and supported horizontally. For this purpose, reference numerals 10 and 11 designate an intermediate support body for passing the metal pin laterally, which is integrally provided on the collar 2'', and an end support body for the metal pin located a little distance from this support body.

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 holding the metal pin which is the contact member 9, and the primary terminal B is attached by press-fitting the upright piece B1 into the hole 8' of the terminal mounting piece 8 from below, and the primary coil is attached to the secondary coil bobbin. When fitted to the inner periphery of the metal pin, the groove 12 connects the metal pin to the supports 10 and 11.
You can bite from above in between.

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,
Further, on the supports 10 and 11 on the collar 3'' of the secondary bobbin, a metal pin, which is a connecting member 9, is supported horizontally by floating from the upper surface of the collar, and an electric wire on the winding start side of the secondary coil is attached to the end of the metal pin. 3A and fix it by soldering etc. Then, when the primary coil is fitted to the inner periphery of the secondary bobbin, the groove 12 of the bent grooved horizontal piece B3 of the primary terminal B is connected to the metal between the supports 10 and 11. The pins are brought into contact and the low voltage side of the secondary coil is thereby 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, and are firmly fixed in an electrically insulating manner. .

In the embodiments shown in FIGS. 3 and 4, a contact member 9 having spring properties such as a phosphor bronze plate is provided with an upward clamping clip 15 and a flat terminal portion 16 on the upper surface of the collar 3'' at the upper end of the secondary bobbin. For this purpose, a support 17 that is open at the top and front for inserting the clamping clip 15 and a support 18 that holds the flat terminal part 16 from both sides are provided on the collar 3'', as shown in FIG. support 1
Insert and install into 7 and 18. The primary terminal B is provided with a downward extension piece B4 extending downward from the upright piece B1, and when the primary coil is fitted to the inner periphery of the secondary coil, the extension piece B4 is connected to the clamping clip 15 of the contact member 9 from above. Get in between them so that they are caught between them.

In this embodiment, the primary terminal A also has a similar downward extension piece A3, and the extension piece A3 has a groove on the upper surface of the flange at the upper end of the secondary bobbin when the primary coil is fitted to the inner circumference of the secondary coil. Grooved support 19 press-fitted into
is provided. As a result, the same terminal can be used for both primary terminals A and B, and the downward extension piece of both terminals, which is press-fitted into the mounting piece 8 and held, can be used with the clamping clip 15.
and can be stabilized by being sandwiched between the grooved supports 19.

In this embodiment as well, 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. Penetrate, hold, horizontal piece A of primary terminal A
The electric wire 2A on the winding start side of the primary coil is wound around the tip of the primary coil 2, and the electric wire 2B on the winding end side of the primary coil is wound around the tip of the horizontal piece B2 of the primary terminal B and fixed by soldering or the like. Support 17 on the collar 3″ of
18 to attach the connecting member 9, and attach the electric wire 3A on the winding start side of the secondary coil to the end of the flat terminal part 16.
Wrap it around and secure it by soldering. Then, when the primary coil is fitted to the inner periphery of the secondary bobbin, the downwardly extending piece B4 of the primary terminal B enters between the clamping clips 15 of the contact member 9 and is compressed, whereby the low voltage side of the secondary coil is connected to the primary Electrically connect to terminal B. Note that the high voltage side of the secondary coil is connected to the high voltage terminal 14 in the same manner as in the first embodiment.

In this state, both coils 2 and 3 are placed in a case, the lower end of the secondary 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.

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, and are firmly fixed in an electrically insulating manner. .

<Effects of the invention> According to the invention, the winding start side of the primary coil is attached to the primary terminal A, the winding end side of the primary coil is attached to the primary terminal B by soldering or welding, and the primary terminal B and the low voltage side of the secondary coil are connected to each other by soldering or welding. Since the connecting member connected to the low voltage side of the secondary coil is brought into contact with the primary terminal for connection, it does not take much time or effort, and production costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a 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,
FIG. 3 is an enlarged perspective view of one of the primary terminals, FIG. 4 is a sectional view of an ignition coil according to another embodiment of the present invention, and FIG. 5 is an exploded perspective view of the main parts of FIG. , 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 the upper end of the collar, 9 is the low voltage side 2 of the secondary coil
A is a connecting member that connects A, A is a primary terminal that connects the winding start side of the primary coil, and B is a primary terminal that connects the winding end side of the primary coil.

Claims (1)

[Claims for Utility Model Registration] A secondary coil is fitted outside the primary coil, and the winding start side of the primary coil is connected to one of the two primary terminals held on the collar at the upper end of the bobbin of the primary coil, and the winding start side of the primary coil is connected to the other side. In the primary side connection device of the ignition coil, which electrically connects the winding end side of the primary coil and the low voltage side of the secondary coil, the low voltage side of the secondary coil is connected to the flange at the upper end of the bobbin of the secondary coil. An ignition coil characterized in that a connecting member is provided, and the connecting member and the other side of the primary terminal connected to the winding end side of the primary coil come into contact when both the primary and secondary coils are fitted. Primary side connection device.