JPH0416410Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to ignition coils used in vehicles such as motorcycles and automobiles, and is particularly concerned with the installation of the needle, which is the output terminal of the secondary coil. Regarding structure.

[Prior Art] Ignition coils are generally made by housing a core, primary coil, secondary coil, etc. in a cylindrical coil case with a bottom, and injecting and solidifying an insulating and waterproof resin into the coil case. A needle is connected to the winding output side terminal of the secondary coil as an output terminal of the secondary coil. The tip of the needle is inserted into a cylindrical mounting part that is integrally provided in the coil case in order to connect to the high tension cord, and then inserted into one end of the high tension cord for connection. ing.

As such known examples, Japanese Utility Model Publication No. 61-1709 and Japanese Unexamined Patent Application Publication No. 58-4911 each disclose a soldering method in which a needle is press-fitted with one axial end of a secondary bobbin and a terminal overlapped. A method is shown in which the needle is fixed and the terminal is connected at the same time to avoid thermal deformation during attachment. At this time, a large diameter portion is formed at the end of the needle opposite to the pointed end, and serves as a stopper when the needle is press-fitted toward the pointed end.

[Problem to be solved by the invention] In each of the above-mentioned known examples, when passing the tip of the needle through the needle hole provided in the partition between the high tension cord attachment part and the coil case, the needle An external force is applied to the needle in the opposite direction to the direction in which it is press-fitted into the terminal plate (hereinafter referred to as the press-fitting direction), and as a result, the stopper part of the needle has no use in the opposite press-fitting direction, so there is a risk that the needle may slip out of the terminal plate. There is.

Also, in order to prevent high voltage current from leaking from the connection between the high tension cord and the needle, it may be necessary to provide a sufficiently long distance between this connection and the bottom of the coil case. The needle cannot be fixed to one end of the secondary bobbin as in the past. Furthermore, it is desired to reduce the amount of waterproofing and insulating resin filled into the coil case as much as possible to reduce the weight of the entire product.

Therefore, the present invention provides an advantageous mounting structure for the needle that can solve these problems.

[Means for Solving the Problems] The ignition coil of the present invention is of a type in which a needle is press-fitted into a terminal plate for connection, and a resin bracket is provided between both ends along the outer axial direction of the coil bobbin. A mounting protrusion that protrudes outward in the radial direction of the coil bobbin is provided in the middle part of this bracket, and the mounting protrusion and the terminal plate are overlapped, and the through hole formed in the mounting protrusion and the mounting hole of the terminal plate are overlapped. A needle is press-fitted into these holes from the mounting protrusion side in the direction opposite to the pointed end to connect these three parts together, and a flange is formed around the needle near the press-fit end, and this flange is It is characterized in that the surface of the mounting protrusion is brought into contact with the surface facing the pointed end of the needle.

[Operation of the invention] When the terminal plate is stacked on the mounting protrusion of the bracket, the holes formed in each are aligned with the end of the needle opposite to the pointed end, and the needle is press-fitted in the direction opposite to the pointed end, these three parts are connected together. Concatenated. At this time, the flange of the needle comes into contact with the surface of the mounting protrusion that faces the needle tip, so even if external force is applied to the needle, such as when passing the needle tip through the needle hole provided in the coil case. ,
Since the direction of this external force coincides with the press-fitting direction, the needle does not come out from the mounting protrusion or the terminal plate.

Furthermore, by using a bracket, the needle is supported at the middle part along the axially outward side of the secondary coil bobbin, so that the overall distance from the connection between the high tension cord and the needle to the bottom of the coil case is sufficient. This makes it difficult for high-voltage current to leak. Furthermore, since the connection position between the needle and the terminal plate is closer to the opening of the coil case, the amount of waterproofing and insulating resin filled is reduced accordingly, making the entire product lighter.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1 to 3. The ignition coil for motorcycles and automobiles is a resin coil case 1 with a bottom and an opening on one side.
has. An iron core 2 is fixed integrally with the coil case 1 in the center thereof.

A primary coil bobbin 3 is fitted around the core 2, and a primary coil 4 is wound around it.

A primary terminal 5 is attached to the end of the primary coil bobbin 3. Further, a secondary coil bobbin 6 is fitted around the primary coil 4, and a secondary coil 7 is wound around this.

A bracket 8 is fixed to the outside of the secondary coil 7 with its both ends engaged with the ends of the secondary coil 7. This bracket 8 has a terminal plate 9.
is installed.

The winding output side terminal of the secondary coil 7 is connected to the terminal plate 9, and the needle 1
0 is also installed.

The needle 10 is arranged near the side wall of the coil case 1, and its tip (described later) is attached to the coil case 1.
It is inserted into a cylindrical attachment part 11 that is integrally formed with.

The mounting part 11 is connected to the inside of the coil case 1 and the partition wall part 11a.
This partition wall portion 11a has a needle 10.
A needle hole 11b is provided for inserting the pointed end side of the needle into the mounting portion 11.

A high tension cord 12 is press-fitted into the mounting portion 11, and the pointed end of the needle 10 is inserted into the end of the cord 12 for connection and integration.

The high tension cord 12 inside the mounting part 11 is
By screwing the cap 14 through the seal 13 into a threaded portion formed around the mounting portion 11, the cap 14 is fixed in a waterproof manner.

A spacer 15 is formed near the core 2 at the bottom of the coil case 1 and projects inward from the coil case 1, thereby supporting the secondary coil bobbin 6 so as to be lifted from the bottom of the coil case 1.

The inside of the coil case 1 is filled with a resin P made of epoxy resin or the like for waterproofing and insulation purposes. The filling amount of resin P in the terminal plate 9 portion is larger than that in the partition wall portion 11a compared to other portions.
The closer the coil case 1 is to the opening, the smaller it becomes.

FIG. 2 shows only the mounting portion of the needle 10 in an enlarged and exploded manner. The bracket 8 made of insulating plastic has a mounting protrusion 17 formed upright approximately in the center thereof and integrally therewith.

A through hole 18 for the needle 10 and a guide protrusion 19 are formed in the mounting protrusion 17 . Both lengthwise ends of the bracket 8 are folded back, and the mounting portion 20,
21 is formed, and engagement holes 22 and 23 are formed respectively. Note that the engagement hole 22 is a cut groove that opens to the tip of the attachment portion 20.

One end of the needle 10 is the high tension cord 1
2, the other end is a press-fit end 25 into the terminal plate 9, and a flange 26 is provided around the middle part near the press-fit end 25.
is formed.

The terminal plate 9 is formed by bending both ends, and the mounting part 27, which is one of the bent parts, has a flange-shaped mounting hole 28 and a guide hole 29, and the other part is a wire-wound part 30. , to which the winding terminal on the output side of the secondary coil is connected.

FIG. 3 shows an enlarged view of the terminal plate 9. The mounting hole 28 has a substantially square hole shape, and is inscribed in the cross-sectional circle 31 of the press-fit end 25 shown by the two-dot chain line, that is, the length of one side is slightly shorter than the outer diameter of the press-fit end 25. ing.

Therefore, returning to FIG. 2 again, the method of attaching the needle 10 will be explained. First, the terminal plate 9 is brought into contact with the mounting protrusion 17, and the through hole 18 and the mounting hole 28 are
The guide protrusion 19 and the guide hole 29 are fitted and positioned so that they match.

Next, the press-fitting end 25 of the needle 10 is passed through the through-hole 18 of the mounting protrusion 17, and using a press-fitting machine (not shown), the needle 10 is press-fitted into the mounting hole 28 from the left side to the right side in the figure in the direction opposite to the pointed end. do.

At this time, the mounting hole 28 has a circular cross section 3 of the press-fit end 25.
1, the mounting portion 27 around the mounting hole 28 is expanded and deformed to match the outer diameter of the press-fit end portion 25. The press-fit end portion 25 is then press-fit into the mounting hole 28 and integrated.

The needle 10 is thereby attached to the terminal plate 9. Further, the flange 26 serves as a support for the press-fitting machine, and also serves as a stopper to prevent the needle 10 from being press-fitted into the mounting hole 28 more than necessary during press-fitting. That is, the flange 26 is attached to the mounting protrusion 1
7, the press-fitting of the press-fitting end 25 stops.

Unlike caulking, this press-fitting operation does not use impact force, so there is no risk of the mounting protrusion 17 of the bracket 8 missing. Further, unlike soldering, high heat is not used, so the mounting protrusion 17 is not deformed by heat.
Therefore, work efficiency and product yield are improved.

Moreover, as shown in FIG.
In order to insert the pointed end 24 side into the mounting part 11,
When the needle 10 is passed through the needle hole 11b of the partition wall 11a, an external force is applied to the needle 10 from the left side to the right side in the figure.

However, the direction of this external force coincides with the press-fitting direction (arrow A direction), and the flange 26 is pressed against the surface of the mounting protrusion 17 facing the pointed end 24 side, so it functions as a stopper, and the press-fitting end 25 is pushed against the mounting protrusion 17. Part 1
7 and the terminal plate 9.

Moreover, as is clear from FIG. 1, the needle 10
is supported by the middle part of the bracket 8 which extends along the outer axial direction of the secondary coil bobbin 6 between both ends of the secondary coil bobbin 6. The extended surface distance of the steel becomes sufficiently long, making it difficult for high-voltage current to leak.

Furthermore, the needle 10 and the terminal plate 9
Since the position of the partition wall 11a forming the bottom of the coil case 1 at the connection part with the coil case 1 approaches the opening of the coil case 1, the waterproof and insulating resin P
The amount of filling is reduced and the overall weight of the product is reduced.

[Effects of the invention] The present invention spans a resin bracket between both ends along the outer axial direction of the coil bobbin, and a mounting protrusion that protrudes outward in the radial direction of the coil bobbin is provided in the middle part of this bracket. By overlapping the mounting protrusion and the terminal plate and press-fitting the needle in the direction opposite to the pointed end, these three parts are connected together, and a flange is formed around the needle near the press-fitting end, and this flange is attached to the mounting protrusion. The surface of the needle was brought into contact with the surface facing the tip of the needle.

Therefore, even if an external force is applied to the needle when passing the pointed end of the needle through the needle hole provided in the coil case, the direction of this external force is the same as the press-fitting direction, so the needle does not touch the mounting protrusion or the terminal plate. This improves work efficiency.

Furthermore, by using a bracket, the needle is supported at the middle part along the axially outward side of the secondary coil bobbin, so the overall distance from the connection between the high tension cord and the needle to the bottom of the coil case can be made sufficiently large. It can be maintained for a long time, and leakage of high voltage current can be easily prevented.

Furthermore, since the connection position between the needle and the terminal plate is closer to the opening of the coil case, the amount of waterproofing and insulating resin filled can be reduced accordingly, and the weight of the entire product can be reduced.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a sectional view, FIG. 2 is an assembled view of the main parts, and FIG. 3 is a perspective view of the main parts. Explanation of symbols, 1... Coil case, 8... Bracket, 9... Terminal plate, 10... Needle, 12... High tension cord, 28...
…Mounting holes.

Claims (1)

[Scope of utility model registration request] The core, the primary coil, and the secondary coil are housed in the coil case, and a terminal plate is provided to which the output side terminal of the winding that constitutes the secondary coil is connected, and the terminal plate has a diameter smaller than the outer diameter of the needle. By forming a mounting hole and press-fitting the opposite end of the needle into the mounting hole, the needle is attached to the terminal plate, and the ignition coil is axially outward of the coil bobbin. A resin bracket is stretched between both ends along the coil bobbin, and a mounting protrusion is provided in the middle of the bracket that protrudes outward in the radial direction of the coil bobbin. Align the through holes and the mounting holes of the terminal plate, and press fit the needle into these holes from the mounting protrusion side in the direction opposite to the pointed end to connect these three together, and press the press fit end around the needle. A flange is formed near the
An ignition coil characterized in that this flange is brought into contact with the surface of the mounting protrusion that faces the tip of the needle.