JPH0442902Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an ignition coil used during the internal combustion period of automobiles and the like.

[Prior Art] FIG. 7 shows a conventional example. This ignition coil has a primary coil b, a secondary coil c, and an iron core d sequentially fitted into a coil case a. Terminals e and f in the figure connect the winding ends of the primary coil b, and are positioned by engaging with recesses g and h formed inside the upper part of the coil case a. The symbol i in the figure is a high voltage terminal.
A filler made of insulating resin is injected and solidified into the coil case a (see Japanese Patent Laid-Open Publication No. 111316/1983).

[Problems to be solved by the invention] By the way, when fitting the primary coil b and the secondary coil c, the winding of each coil can be adjusted by accurately positioning the relative positions of the two while being careful not to misassemble them. It is necessary to avoid making mistakes when connecting the wire terminals. Therefore, the assembly process must be performed with great care.

Furthermore, when the coil case a is attached to the vehicle body, the terminals e and f must be in their respective predetermined positions. Therefore, coil case a
When inserting the coils b and c into the coil case a, it is necessary to accurately position the coils b and c relative to the coil case a to prevent misassembly.

Therefore, the purpose of the present invention is to accurately position the ignition coil between the primary coil and the secondary coil and between the outer coil and the coil case while preventing incorrect assembly and easily integrating the ignition coil.
The objective is to improve workability and yield.

[Means for Solving the Problems] The ignition coil of the present invention includes a small coil assembly formed by fitting and integrating a primary coil and a secondary coil, and a coil with this small coil assembly fitted inside. An ignition coil equipped with a case includes a guide groove extending in the axial direction between the bobbin of the outer coil constituting the coil subassembly and the inner surface of the coil case, and a protrusion that guides the guide groove. In addition to providing a plurality of guide parts and making the sizes of these guide parts different from each other,
The axial bobbin end of the inner coil is formed so that at least a portion thereof overlaps the axial bobbin end of the outer coil, and the overlapping portions of both bobbin ends are provided with engagements that engage with each other. The present invention is characterized in that a plurality of engaging parts each consisting of a mating protrusion and an engaging recess are provided, and the sizes of these engaging parts are made to be different from each other.

[Operation of the invention] When the primary coil and the secondary coil are fitted inside and outside, the sizes of the plurality of engaging portions are different, so the engagement occurs only when the relative positional relationship between the two coils is in a predetermined manner. The two are then integrated to form a coil subassembly in a manner that prevents erroneous assembly.

Subsequently, when the coil subassembly is fitted into the coil case, the outer coil bobbin is guided by the guide portion and quickly positioned. Moreover, since the guide part is made up of a plurality of parts having different sizes, if the positional relationship is different, the sizes of the longitudinal grooves and the protrusions of the guide parts will be different, and they will not be able to engage with each other, thereby preventing incorrect assembly.

[Example] An embodiment of the present invention is shown in FIGS. 1 to 6.

This ignition coil includes a coil case 1, a primary coil 2, a secondary coil 3, an iron core 4, and the like. A primary terminal 6 is provided above the secondary coil 3, and a high voltage terminal 7 is formed protruding from the bottom of the secondary coil 3. The secondary coil 3 is integrally fitted inside the primary coil 2, and the two constitute a small coil assembly. This coil subassembly is placed in a coil case 1, and the high voltage terminal 7 extends into a cylindrical joint portion 8 protruding from the bottom of the coil case 1. A filler 9 made of epoxy resin or the like is sealed inside the coil case 1 .

Further details of each part will be explained. The primary coil 2 is a cylindrical primary bobbin 10 with a conductive wire wound around the outer periphery, and the winding ends 11 and 12 are as follows.
It extends toward the upper end of the primary bobbin 10. Furthermore, on the upper edge of the primary bobbin 10, large and small engagement protrusions 13 and 14 that protrude upward and large and small guide protrusions 15 and 16 that protrude sideways are formed integrally with a 180° phase difference, respectively. has been done. (See Figures 2 and 3).

The secondary coil 3 has a secondary bobbin 17 divided into a plurality of sections in the length direction, and the winding wire is divided and wound for each section. The secondary coil 3 has an outer diameter that can be accommodated inside the primary bobbin 10.
As shown in FIGS. 2 and 4, a cylindrical portion 19 is formed in the center of the terminal portion 18, which is the low-pressure side end portion of the secondary bobbin 17. The cylindrical portion 19 is formed with an opening in the length direction of the secondary bobbin 17 (see FIG. 1),
It is possible to accommodate 4 iron cores.

In the radial direction of the terminal portion 18,
An extension part is provided that protrudes to the opposite side with a 180° phase difference and forms an overlapping part with the end part of the primary bobbin 10 located on the outside, and a notch-shaped engagement recess 2 is provided at the tip of the extension part.
0 and 21 are formed, and can be fitted into the engaging protrusions 13 and 14.

Further, an engagement recess 20 is provided on the upper surface of the terminal portion 18.
Primary terminal holders 22 and 23 are provided at positions substantially perpendicular to and 21. The primary terminal holders 22 and 23 are cylindrical portions that can be elastically deformed by grooves 22a and 23a, and are provided substantially parallel to each other. These primary terminal holders 22 and 2
The bent leg portions 24 of the primary terminals 5 and 6 are press-fitted into the terminals 3 . Grooves 25 and 26 are formed at both ends of the leg portion 24. Therefore, when the legs 24 of the primary terminals 5 and 6 are press-fitted into the primary terminal holders 22 and 23 from the same direction, the sixth
As shown in the figure, the groove 25 is located approximately at the terminal portion 18.
is arranged so as to overlap the virtual circle 27 of the groove 2.
6 is positioned outward from the terminal portion 18. Note that the terminal portion 18 is provided in the groove 25.
A winding end 29 of a secondary coil led out from a notch 28 formed in a part of the coil is wound.

On the other hand, at the high pressure side end 30 of the secondary bobbin 17,
A relay protrusion 31 is formed at the edge, and the winding end end 32 of the secondary coil is wound halfway around this, and the tip end thereof is connected to a high voltage terminal plate 33. The high-voltage terminal plate 33 is a plate-like member attached to the lower surface of the high-voltage end, and the high-voltage terminal 7 is press-fitted into the center of the plate.

Furthermore, the inner wall of the coil case 1 has large and small guide grooves 3 into which the engaging protrusions 13 and 14 can be fitted.
4 and 35 are formed on the inner peripheral surface of the coil case 1 with a phase difference of 180°.

The widths of the engagement protrusion 13, the guide protrusion 15, the engagement recess 20, and the guide groove ₃₄ are approximately equal to each other. , the respective widths of the engaging recess 21 and the guide groove 35 are also approximately the same dimension l ₂
It has become a degree. In particular, the engagement protrusion 13 and the engagement recess 20 and the engagement protrusion 14 and the engagement recess 21 are designed to be press-fitted and connected to each other with almost no clearance. .

However, they are formed so that l ₁ >l ₂ and those with different widths cannot be fitted together.

Therefore, in order to assemble this ignition coil, first attach the primary terminals 5 and 6 to the respective primary terminal holders 22 and 23, and connect the winding end 29 on the winding start side of the secondary coil to the groove 25 of the primary terminal 5. do. Next, when the secondary coil 3 is fitted into the primary coil 2 while aligning the engagement protrusion 13 and the engagement recess 20 and the engagement protrusion 14 and the engagement recess 21, respectively, the engagement protrusion 13 is engaged. The engagement protrusions 14 fit into the engagement recesses 21 and rotate 180°.
Two engaging portions are formed laterally due to the phase difference. This allows both coils 2 and 3 to be easily integrated. At this time, if the position between the secondary coil 3 and the primary coil 2 is misaligned, the width of the engaging portion will be l ₁ and
Since l ₂ is different from l ₁ and l 1 > l ₂ , the engaging protrusions 13 and 14 do not fit into the engaging recesses 20 and 21, and the secondary coil 3 fits into the primary coil 2. Since they are not integrated, incorrect assembly and wiring errors are prevented. In this state, as shown in Figure 6,
Since the grooves 26 of the primary terminals 5 and 6 are located outside the imaginary circle 27, the winding ends 11 and 12 are twisted and connected to the respective grooves 26, and then soldered. Note that each step of tying and soldering the end of the winding wire can be automated by an automatic machine because the primary terminals 5 and 6 are on the terminal part 18 and can be performed outside the coil case 1. be. Moreover, since the grooves 26 of each of the primary terminals 5 and 6 protrude outward, the work becomes easier.

After assembling the primary coil 2 and secondary coil 3,
This coil subassembly is fitted into the coil case 1. At this time, the engagement protrusion 15 and the guide groove 34 of the coil case and the engagement protrusion 16 and the guide groove 35 are aligned, respectively. In other cases, the guide grooves 34 and 3 protruding inward from the coil case 1
5 and the lower end outer peripheral edge 3 of the primary bobbin 10
6 (see FIG. 1), it will not be possible to fit, and incorrect assembly will be prevented. In addition, the primary coil 2,
By forming a small assembly consisting of the secondary coil 3 and the primary terminals 5 and 6, each part is not handled separately, so handling in intermediate steps is improved and workability is improved.

After fitting the coil subassembly in which the primary coil 2 and the secondary coil 3 are integrated into the coil case 1 in this way, the iron core 4 is put into the cylindrical part 19 and then filled from the upper opening of the coil case 1. The material 9 is injected and solidified with the primary terminals 5 and 6 protruding outward. This completes the ignition coil. However, the iron core 4 may be inserted into the cylindrical portion 19 when the primary coil 2 and the secondary coil 3 are assembled together.

In this embodiment, the terminal part 18 is provided on the low-voltage part side of the secondary coil 3, and the primary terminals 5 and 6 are attached to the upper part of the terminal part 18. Therefore, the terminal part 18 is located at the farthest position from the high-voltage part, and the high-voltage part There is no risk of leakage and reliability can be improved.

[Effects of the invention] The present invention provides a plurality of engaging portions of different sizes in the overlapping portion between the bobbin ends of the primary coil and the secondary coil. Accurate positioning, prevention of misassembly, and quick and easy integration. Moreover, since a plurality of guide parts of different sizes are provided between the outer coil bobbin and the inner surface of the coil case, each of which is made up of guide grooves and protrusions that can be engaged with each other, the coil subassembly with respect to the coil case can be easily assembled. positioning can be done easily and quickly while preventing incorrect assembly. Therefore, overall workability and yield can be improved.

[Brief explanation of drawings]

1 to 6 show examples, in which FIG. 1 is a longitudinal view, FIG. 2 is an exploded view, and FIGS. 3 to 6 are plan views of main parts. FIG. 7 is an exploded view of the conventional example. (Explanation of symbols), 1...Coil case, 2...Primary coil, 3...Secondary coil, 4...Iron core, 5,
6...Primary terminal, 7...High voltage terminal, 10...
...Primary bobbin, 11, 12... End of primary winding, 13, 14... Engaging protrusion, 15, 16... Guide protrusion, 17... Secondary bobbin, 18... Terminal part, 20, 21 ...Engaging recess, 24...Leg, 25, 26...Groove, 29...Secondary winding start end, 32...Secondary winding end end, 34, 35
...Guide groove.

Claims (1)

[Scope of utility model registration request] In an ignition coil that includes a coil sub-assembly formed by fitting and integrating a primary coil and a secondary coil, and a coil case into which this coil sub-assembly is fitted, the outer part of the coil sub-assembly is A plurality of guide parts are provided between the coil bobbin and the inner surface of the coil case, each consisting of a guide groove extending in the axial direction and a protrusion that guides the guide groove,
and the guide portions are made to have different sizes, and the axial bobbin end of the inner coil is formed so that at least a portion thereof overlaps the axial bobbin end of the outer coil. An ignition device characterized in that a plurality of engaging portions each consisting of an engaging protrusion and an engaging recess that engage with each other are provided in the overlapping portion of both bobbin ends, and the sizes of these engaging portions are made to be different from each other. Tension coil.