JPH0447944Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a closed magnetic circuit type ignition coil that is easy to assemble.

(Prior Art) As an ignition coil conventionally used in automobiles and the like, the one shown in FIG. 9 is known.

The ignition coil 101 is located in the case 102
A rod-shaped core 103 is arranged in the center of the core 10.
3 is wound with a primary coil 104 and a secondary coil 105, one end of the secondary coil 105 is connected to the high voltage terminal 106, the other end is connected to the primary coil 104,
The ends of the next coil 104 are a + terminal 107 and a - terminal, respectively.
It is connected to the terminal 108.

(Problem to be solved by the invention) According to the above configuration, the ignition coil 10
1 had the disadvantage of poor ignition performance because it was an open magnetic circuit type.

The present invention has been devised in view of the above circumstances, and the object of the present invention is to provide a closed magnetic circuit type ignition coil that improves ignition performance and facilitates assembly by using a closed magnetic circuit type. is to provide.

(Means for Solving the Problems) In order to achieve the above object, the closed magnetic circuit type ignition coil according to the present invention includes a bobbin on which a primary coil and a secondary coil are attached, and a coil that passes through the bobbin. It includes an inner bobbin core that is attached to the bobbin, an outer bobbin core that is combined with the inner bobbin core to form a closed magnetic path, and a case that houses the bobbin and the outer bobbin core that are attached with the inner bobbin core. A protrusion is formed on the bobbin that protrudes outward beyond the maximum winding diameter of this bobbin and each coil, and when the bobbin is installed inside the case, the protrusion comes into contact with the inner wall of the case, and inside this bobbin and the bobbin. By pressing the core toward the bobbin outer core side, the bobbin outer core and the bobbin inner core, whose movement in the pressing direction is regulated by the case, are brought into close contact to form a closed magnetic path.

(Function) When the bobbin is installed in the case, the protrusion formed on the bobbin contacts the inner wall of the case and presses the bobbin and the bobbin inner core toward the bobbin outer core. Since the outer bobbin core is restricted from moving in the pressing direction by the case, the inner bobbin core and the outer bobbin core are brought into close contact with each other to form a closed magnetic path.

(Example) An example of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a completed view of the closed magnetic circuit type ignition coil of the present invention, FIG. 2 is a longitudinal cross-sectional view of the same, and FIG. 3 is an exploded view of the same when assembled.

As shown in Fig. 1, the external appearance of the closed magnetic circuit type ignition coil 1 consists of a coil case 2, the + terminal 3 and - terminal 4 of the primary coil attached to the top of the coil case 2, and the bottom surface of the coil case 2. It consists of a high voltage cord 5 attached to the

In FIG. 2, reference numeral 2 denotes a concave coil case with an open upper end, and a connection hole 2d penetrating from the inner peripheral surface 2b to the outer peripheral surface 2c is bored in the lower part of the coil case 2. Outer surface 2 below
c is provided with a connecting portion 2e that protrudes downward.

A bobbin 6 is provided in the case 2, the bobbin 6 has a hole 6a in the center, and a vertical groove 6b with an open upper end is formed between the hole 6a and the outer periphery of the bobbin 6. The upper end of the outer periphery of the bobbin 6 has a protrusion 6c that protrudes outward in the horizontal direction, and the lower part of the bobbin also has a protrusion 6d that protrudes outward in the horizontal direction and has the same length as the protrusion 6c. ing. A plurality of protrusions 6e are formed along the outer periphery of the bobbin between the protrusions 6c and 6d, and the protrusions 6e are formed so as not to protrude outward beyond the protrusions 6c and 6d. has been done.

A primary coil 7 is wound in the vertical groove 6b concentrically with the hole 6a, a tertiary coil 8 is wound between the plurality of grooves 6e, and a hole 6a in the center of the bobbin 6 has a primary coil 7 wound therein. Vertical portion 9 of L-shaped bobbin inner core 9
a is inserted and the horizontal portion 9b is exposed to the outside, and the vertical portion 10a of the L-shaped bobbin outer core 10 is fitted into the recess 2a provided on the inner circumferential surface 2b of the coil case 2. The horizontal portion 10b is arranged such that its tip is directed toward the lower part of the vertical portion 9a of the bobbin inner core 9, and the upper and lower protrusions 6c and 6d of the bobbin 6 abut against the inner peripheral surface 2b of the coil case 2. As a result, a closed magnetic path is formed by bringing the horizontal end face 9c of the bobbin inner core 9 into close contact with the vertical part 10a of the bobbin outer core 10, and by bringing the horizontal end face 10 of the bobbin outer core 10 into close contact with the vertical part 9 of the bobbin inner core 9. has been done.

Further, a support protrusion 6f is provided below the protrusion 6d on the lower side of the bobbin 6, and a needle member 12, which is a secondary terminal for connecting to the high voltage cord 11, is supported by the support protrusion 6f.

One end of the secondary coil 8 is connected to the high voltage cord 11 via the needle member 12, and the ends of the primary coil 7 are connected to the + terminal 3 and the - terminal 4, respectively. has been done.

A waterproof rubber 14 is attached to a connecting portion 2e provided on the lower surface of the coil case 2 to protect the connecting portion between the high voltage cord 11 and the needle member 12 from water and the like.

To assemble the closed magnetic circuit type ignition coil 1, first, the bobbin outer core 10 is attached to its horizontal portion 1.
The bobbin 6 is fitted into the recess 2a of the coil case 2 with the 0b facing down, and then the bobbin 6, on which the primary coil 7 and the secondary coil 8 are wound and the secondary terminal 12 and the bobbin inner core 7 are attached, is inserted into the coil case 2. Insert it into the
After the bobbin inner core 9 and the bobbin outer core 10 are brought into close contact to form a closed magnetic path, and the primary coil 7 and the secondary coil 8 are connected to the primary terminals 3 and 4 and the secondary terminal 12,
Mold with filler 13.

FIG. 4 and FIG. 5 show a configuration in which the bobbin inner core 9 and the bobbin outer core 10 are fixed to the bobbin 61 side as a second embodiment. By providing the protrusions 61a and using them as pressing parts, the protrusions 61a,
The bobbin outer core 10 is placed in the recesses 61b, 61b of the bobbin 61a.
By fitting from the bottom side, it can be attached to the coil case as one body with the bobbin inner core 9.

In addition, as a third embodiment, as shown in FIG.
1a, 71a and attach the bobbin outer core 72 in the direction of the arrow to bring the cores into close contact with each other to form a closed magnetic path, or as shown in FIG. An outer core 72 may also be attached.

In addition, in the above embodiment, all the combinations shown in FIG. 8 can be used for the cores forming the closed magnetic path, and the cores can be divided into three or more pieces, for example, as shown in the upper right of the figure, connecting cores are provided above and below the bobbin. It can also be configured in such a manner that both upper and lower ends of the inner core and the outer bobbin core are brought into close contact with the connection core.

(Effects of the invention) As explained above, in the closed magnetic circuit type ignition coil according to the invention, when the bobbin is installed in the case, the protrusion formed on the bobbin comes into contact with the inner wall of the case, and the bobbin and the bobbin Since the inner core is pressed toward the bobbin outer core side and the bobbin inner core and bobbin outer core are brought into close contact to form a closed magnetic path, it is easy to assemble a closed magnetic path type ignition coil with high ignition performance. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a completed view of the closed magnetic circuit type ignition coil, Fig. 2 is a vertical sectional view thereof, Fig. 3 is an exploded view showing the assembled state, Fig. 4 is a perspective view of the second embodiment,
Figure 5 is a longitudinal sectional view of the same, Figures 6 and 7 are the 3rd cross-sectional view.
FIG. 8 is a diagram illustrating an embodiment of the present invention, FIG. 8 is an assembled view of the core, and FIG. 9 is a sectional perspective view of a main part of a conventional ignition coil. 1...Closed magnetic circuit type ignition coil, 2...
Case, 6...Bobbin, 6c, 6d, 61b, 7
1a...Protrusion (pressing part), 7...Primary coil, 8
...Secondary coil, 9...Core in bobbin, 10...
Core outside the bobbin.

Claims (1)

[Scope of utility model registration request] A bobbin to which a primary coil and a secondary coil are attached, an inner bobbin core that is attached to the bobbin so as to pass through the bobbin, an outer bobbin core that is combined with the bobbin inner core to form a closed magnetic path, and the bobbin A case is provided for storing a bobbin to which an inner core is attached and the bobbin outer core, and a protrusion is formed on the bobbin and protrudes outward from a maximum winding diameter of the bobbin and each coil. With the bobbin installed in the case, the protrusion comes into contact with the inner wall of the case, and the bobbin outer core and the bobbin inner core, whose movement in the pressing direction is regulated by the case, are brought into close contact and magnetized. A closed magnetic path type ignition coil, wherein the bobbin and the bobbin inner core are housed in the case in a state where they are pressed toward the bobbin outer core so as to form a path.