JP3471525B2 - Ignition coil - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil used for ignition of a petroleum fan heater or the like. 2. Description of the Related Art In a conventional ignition coil of this type, a primary coil and a secondary coil are wound side by side on a bobbin through which a rod-shaped core is inserted. In order to wire the primary coil and the secondary coil, it is necessary to attach terminals to the bobbin, and connect the terminals to the windings of the primary coil and the secondary coil. Therefore, as shown in FIG. 4, a bobbin B into which the ferrite core FC is inserted at the center is provided with a flange B on the primary coil C1 side.
F1, a flange BF2 between the primary coil C1 and the secondary coil C2, and a flange BF3 on the secondary coil C2 side, and connect the terminals T1 and T2 of the primary coil C1 to the flange B.
Attached to F1 ・ BF2, terminal T3 ・ of secondary coil C2
T4 was attached to flanges BF2 and BF3. In the conventional ignition coil shown in FIG. 4, the magnetic path does not become a closed magnetic path because the rod-shaped ferrite core FC is used. Therefore, it is more efficient to make the primary coil C1 and the secondary coil C2 as close as possible. However, since the terminals T2 and T3 must be attached to the bobbin, the distance between the primary coil C1 and the secondary coil C2 increases, and the efficiency of the ignition coil decreases. Therefore, it is necessary to increase the diameter of the ferrite core FC and to increase the winding diameter of the primary coil C1 and the secondary coil C2, which causes a problem that the ignition coil becomes large. [0004] It should be noted that each coil winding of the moving primary coil C1 and the secondary coil C2 in any one of the terminals T2 · T3 are attached to the flange B F2 flange B F1 · B F3 to pin T2 · T3 The secondary coil C2 must be stretched through the outside of C1 and C2. In particular, the winding of the secondary coil C2 has an extremely small wire diameter and thus is easily broken. [0005] In view of the above problems, an object of the present invention is to provide an ignition coil that can be reduced in size without a risk of disconnection. [0006] In order to solve the above-mentioned problems, the present invention relates to an ignition coil in which a primary coil and a secondary coil are wound side by side on a bobbin through which a rod-shaped core is inserted. At least one terminal of a secondary coil is provided at an end of the bobbin on the primary coil side, and a groove is formed in the primary coil winding portion of the bobbin over the secondary coil winding portion and the primary coil side end. And a secondary coil winding is connected to the terminal through the groove. [0007] By passing the secondary coil winding through the groove, it is not necessary to stretch the secondary coil outside the primary coil.
Disconnection of the next winding can be prevented. In addition, without providing a groove,
When the secondary coil winding is simply passed through the primary coil winding, the primary coil winding is thicker than the secondary coil winding. There is a possibility that the coil winding will be crushed and disconnected. However, in the present invention, since the secondary coil winding is passed through the groove, the primary coil winding does not touch the secondary coil winding in the groove, and
There is no risk of disconnection of the secondary coil winding. Referring to FIG. 1, reference numeral 1 denotes an ignition coil according to the present invention, and a primary coil 3 and a secondary coil are mounted on a bobbin 2 through which a core 11 is inserted substantially at the center. 4 are wound around the thin flange 22. The primary coil 3 is formed by winding tens of turns of a urethane wire having a relatively large diameter,
The next coil has a very thin urethane wire with a flange 21
Are wound several thousand times in total. The terminal 31 attached to the flange 23 at the end of the primary coil 3
32 were connected to both ends of the primary coil 3. A terminal 42 provided on the flange 23 so as to be aligned with the terminals 31 and 32 in a straight line, and a flange 2 at an end of the secondary coil 4 side.
5, both ends of the winding of the secondary coil 4 were connected to the terminal 41 attached. Incidentally, the secondary coil 4 is wound before the primary coil 3 is wound. Therefore, as shown in FIG.
A groove 24 is formed in a portion where the primary coil 3 is wound. Also, V-shaped cuts 22A and 23A reaching the bottom of the groove 24 are provided in the flanges 22 and 23 sandwiching the groove 24, respectively. Therefore, the winding for the secondary coil 4 is passed from the terminal 42 in the order of the notch 23A, the groove 24, and the notch 22A. After winding between the flanges 22 and 21, the notch 21A of the flange 21 is passed. It is wound between the flange 21 and the flange 25 to complete the winding of the secondary coil 4. Next, after the secondary coil 4 is wound, the primary coil 3 is wound. However, since the winding of the secondary coil 4 is housed in the groove 24, it is not tightened by the winding of the primary coil 3. There is no risk of disconnection. In addition, in order to provide the groove 24,
As shown in FIG. 3, the portion indicated by F was made thicker than the other portions. By the way, as described above, the terminals 31, 32,.
42 are arranged so as to be aligned on one straight line, so that when attaching the ignition coil 1 to a substrate or the like, each of the terminals 31, 32.
By bending the 42 outward, the ignition coil 1 can be mounted in an upright state. As is apparent from the above description, according to the present invention, the primary coil and the secondary coil can be made as close as possible without any risk of disconnection, so that the entire ignition coil can be reduced in size. can do.

[Brief description of the drawings] FIG. 1 is a diagram showing a configuration of an embodiment of the present invention. FIG. 2 is a view showing the shape of a bobbin. FIG. 3 is a sectional view taken along the line III-III. FIG. 4 is a diagram showing a conventional ignition coil. [Explanation of symbols] 1 ignition coil 2 bobbins 3 Primary coil 4 Secondary coil

Claims (1)

(57) [Claim 1] In an ignition coil in which a primary coil and a secondary coil are wound side by side on a bobbin through which a rod-shaped core is inserted, a primary coil side end of the bobbin At least one terminal of the secondary coil is provided, and a groove is provided in the primary coil winding portion of the bobbin between the secondary coil winding portion and the primary coil side end portion, and the secondary coil winding is formed. An ignition coil, wherein the ignition coil is connected to the terminal through a groove.