JPH0442909A - Ignition coil device of internal combustion engine - Google Patents

Abstract

PURPOSE:To eliminate the need for a core gap to prepare a spacer for gap, enable production cost to be reduced, and enable production man-hour to be reduced by forming a projecting part on an inner wall surface of a primary bobbin. CONSTITUTION:A protruding part 20 for retaining a gap on an inner wall surface of a primary bobbin 7 is formed. A gap of a core 3 can be retained by this protruding part 20. The protruding part 20 which is one part of the primary bobbin 7 plays a role of a spacer 11 and the gap of the core 3 is retained by this protruding part 20, thus preventing start-up of secondary current from being increase due to increase in inductance.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention provides a method for winding an iron core through a secondary bobbin, f:'
The present invention relates to an internal combustion engine ignition coil device comprising a secondary coil and a secondary coil wound around a secondary bobbin disposed around the outer periphery of the primary coil, with a gap formed in the iron core.

[Conventional technology]

FIG. 2 is a principle diagram of a conventionally known internal combustion engine ignition coil device, where 1 is an ignition coil and 2 is an igniter.

FIG. 3 is a cross-sectional view showing an example of a conventional internal combustion engine ignition coil device, in which 4 is a heat sink fixed to the iron core 3 at a fixed part 41, and 5 is a heat sink 4 to the iron core 3. and a molded case that integrally fixes the iron core 3, and this molded case 5 exposes at least the secondary exposed parts 42a and 42b of the heat sink 4, and has a storage part 51 formed inside.52 is an igniter. The control circuit section constituting the secondary of 2 and the pocket section 53a and 53b are for storing the power 1 to transistor unit 6 used in 12, the exposed section 42a of the heat sink 4,
This is a window that exposes 42b.

FIG. 4 is a cross-sectional view taken along the line ■-■ in FIG. A secondary bobbin 11 provided around the outer periphery of the secondary bobbin 7 and around which the secondary coil 10 is wound is an aluminum spacer provided to form a gap in the closed magnetic path. A high voltage tower 12 has a terminal for guiding the high voltage induced in the secondary coil 10 to the outside. 13 is a connector for connecting the power transistor unit 6 and an external circuit.

Note that the remaining spaces of the storage section 51 and the pocket section 52 in the molded case 5 are filled with a resin material (not shown).

In the internal combustion engine ignition coil device described above, when a control signal is sent to the power transistor unit 6 via the connector 13, the power transistor unit 6 controls the primary coil 8 based on this signal.

A high voltage is generated in the secondary coil 10 according to the control of the primary coil 8, and this high voltage is sent to the distributor via the high voltage tower 12.

The secondary heat generated by the power transistor unit 6 is transmitted through the heat sink 4 and released to the outside through the exposed portions 42a, 42b, and the window portions 53a, 53b, and other heat is transmitted through the heat sink 4 and released to the outside through the iron core 3. Ru. On the other hand, the primary coil 8. The main heat generated from the secondary coil 1° is released from the iron core 3 to the outside.

[Problem to be solved by the invention]

The internal combustion engine ignition coil device configured as described above is provided with a spacer 11 for forming a gap in the closed magnetic path in order to prevent the increase in inductance and the rise of the current in the secondary coil 10 from becoming low. However, this increases the cost and the number of assembly steps.

The present invention was made to solve these problems, and an object of the present invention is to obtain an internal combustion engine ignition coil device that can reduce costs and assembly man-hours.

[Means to solve the problem]

In the internal combustion engine ignition coil device according to the present invention, a protrusion for maintaining a gap is formed on the inner wall surface of the next bobbin.

[Effect]

In this invention, the gap between the cores is maintained by the convex portion formed on the inner wall surface of the primary bobbin.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The same or corresponding parts as those in the figures to FIG. 4 are designated by the same reference numerals, and the explanation thereof will be omitted.

In the figure, ZO is a convex portion formed on the inner wall surface of the primary bobbin 7, and the gap between the iron core 3 is maintained by this convex portion 20.

In the above-mentioned internal combustion engine ignition coil device, the spacer 11 is replaced by the secondary convex portion 20 of the primary bobbin 7, and the gap between the iron core 3 is maintained by the convex portion 20, and the secondary current is reduced by increasing the inductance. This prevents the rise from becoming low.

〔Effect of the invention〕

As explained above, according to the internal combustion engine ignition coil device of the present invention, since the convex portion is formed on the inner wall surface of the primary bobbin, there is no need to prepare a spacer for the gap in the iron core, which reduces the manufacturing cost. This has the effect of reducing the number of assembly steps as well as reducing the number of assembly steps.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a principle diagram of an internal combustion engine ignition coil device, FIG. 3 is a sectional view of a conventional internal combustion engine ignition coil device, and FIG. IV-I
It is a sectional view along the V line. In the figure, 3 is an iron core, 7 is a primary bobbin, 8 is a primary coil, 9 is a secondary bobbin, 10 is a secondary coil, and 20 is a convex portion. In each figure, the same reference numerals indicate the same or corresponding parts2.

Claims (1)

[Claims] The iron core includes an iron core having a gap, a primary coil wound around the iron core via a primary bobbin, and a secondary coil wound around a secondary bobbin provided on the outer periphery of the primary coil. An internal combustion engine ignition coil device in which a gap is formed, wherein a convex portion for holding the gap is formed on an inner wall surface of the primary bobbin.