JP2010212395A - Ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil for an internal combustion engine, the ignition coil downsizing an insulating case even when space is provided in the insulating case so that a breakdown voltage is ensured around a reel-out terminal of a secondary coil that is reeled out from a secondary coil bobbin to exterior. <P>SOLUTION: The ignition coil 1 for the internal combustion engine includes: iron cores 9 and 10 having a high voltage cylindrical part 3 protruded outside and in which a primary coil 5 and a secondary coil 7 are wound to magnetically couple a primary coil bobbin 6 and a secondary coil bobbin 8 that are cylindrical and arranged concentrically; a high voltage terminal 4 outputted to exterior; and an insulating case 2 that houses these components. In the ignition coil 1 for an internal combustion engine, the high voltage cylindrical part 3 and an axis of the secondary coil 7 are arranged crossing each other substantially at a right angle. The secondary coil bobbin 8 is provided so that a plurality of flanges 18 has an interval. The secondary coil 7 is divided and wound between the respective flanges 18. A reel-out terminal 17 of the secondary coil 7 reeled out from the secondary coil bobbin 8 to exterior is connected to the high voltage terminal 4 while being led from the flange 18b provided inside the flange 18a provided at an end part among the plurality of flanges 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a molded internal combustion engine ignition coil that supplies a high voltage in order to generate a spark discharge, for example, in an ignition plug of an automobile engine.

  Conventionally, an iron core part having a high-pressure cylinder part protruding outward, winding a primary coil and a secondary coil, and magnetically coupling the cylindrical primary coil bobbin and secondary coil bobbin arranged concentrically, The high-voltage terminal is connected to the high-voltage terminal and one end of the secondary coil, and the insulation case that accommodates the high-voltage cylinder and the axis of the secondary coil intersect each other at a substantially right angle. Arranged ignition coils for internal combustion engines are known. (See Patent Document 1)

JP 2001-237131 A

  In the case of the conventional ignition coil for an internal combustion engine, as shown in FIG. 2, the secondary coil bobbin 8 is provided with a plurality of flanges 18 provided at intervals, and the secondary coil 7 is divided and wound between the flanges 18. The terminal wire at the end of the winding is attached to the flange 18a at the end, and the connection terminal 17 is pulled out from the flange 18a at the end and is in contact with the high-voltage terminal 4. The ignition coil for the internal combustion engine is provided with a necessary distance L between the connection terminal 17 and the secondary coil 7 serving as an extraction terminal of the secondary coil 7 and between the connection terminal 17 and the insulating case 2. The withstand voltage around the terminal is secured.

  The above-mentioned conventional ignition coil for an internal combustion engine has a space in the insulating case so as to have a distance for securing a withstand voltage around a secondary coil lead-out terminal drawn out from the end of the secondary coil bobbin. Since it is provided, there is a problem that the insulating case cannot be reduced in size, and improvement has been desired.

  The present invention solves the above-mentioned problem, and even if a space is provided in the insulation case so as to ensure a withstand voltage around the secondary coil lead-out terminal drawn out from the secondary coil bobbin, the insulation case can be downsized. An ignition coil for an internal combustion engine is provided.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a cylindrical primary coil bobbin having a high voltage cylindrical portion projecting outward, wound around a primary coil and a secondary coil, and arranged concentrically. It is composed of an iron core that magnetically couples the secondary coil bobbin, a high-voltage terminal that is output to the outside, and an insulating case that accommodates these, and the high-voltage cylinder and the axis of the secondary coil are arranged substantially at right angles. An ignition coil for an internal combustion engine, wherein the secondary coil bobbin has a plurality of hooks provided at intervals, and the secondary coil is divided and wound between the hooks and drawn out from the secondary coil bobbin. An ignition coil for an internal combustion engine, characterized in that a secondary coil drawing terminal is drawn from a hook inside the end of the plurality of hooks and connected to a high voltage terminal.

  In the invention according to claim 2, the drawer terminal is a connection terminal to which a terminal at the end of winding of the secondary coil is connected to one end, and one end of the connection terminal is an end portion in the plurality of cages. The ignition coil for an internal combustion engine according to claim 1, wherein the ignition coil is disposed on and pulled out from a bag inside the bag and the other end is in contact with a high voltage terminal.

  According to the ignition coil for an internal combustion engine of the present invention, the secondary coil lead-out terminal that is drawn out from the secondary coil bobbin is more than the hook at the end among the multiple hooks provided at intervals in the secondary coil bobbin. The insulation case can be reduced in size because it is pulled out from the inner bag and shortens.

It is a schematic sectional drawing of the ignition coil for internal combustion engines of Example 1 which concerns on this invention. It is a schematic sectional drawing of a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an ignition coil for an internal combustion engine according to a first embodiment of the present invention, and illustrates a molded ignition coil attached to an automobile engine. However, the same reference numerals are used for those having the same functions as those in FIG.

  In FIG. 1, an ignition coil 1 for an internal combustion engine has an insulating case 2 having a shape in which an upper surface is opened and a high-pressure cylinder portion 3 protrudes outward on a side wall 2a. A high voltage terminal 4 is fitted and accommodated in the high voltage cylinder portion 3. In the insulating case 2, a cylindrical primary coil bobbin 6 around which the primary coil 5 is wound and a cylindrical secondary coil bobbin 8 around which the secondary coil 7 is wound are concentrically arranged and accommodated. ing. Moreover, the axis | shaft of the high voltage | pressure cylinder part 3 and the secondary coil 7 is arrange | positioned so as to cross | intersect at substantially right angle.

  The primary coil bobbin 6 and the secondary coil bobbin 8 are magnetically coupled by iron cores 9 and 10. The secondary coil bobbin 8 is provided with a plurality of flanges 18 with intervals, and the secondary coil 7 is divided and wound between the flanges 18. In the secondary coil bobbin 8, the wire connection portion 17 a of the connection terminal 17 is attached to, for example, the second flange 18 b that is positioned inside the end flange 18 a among the plurality of flanges 18. The connection terminal 17 is connected to the wire connection part 17a at one end of the terminal wire at the end of the secondary coil 7 and is pulled out from the flange 18b to become a lead-out terminal of the secondary coil 7. The other end of 17 is connected to the high voltage terminal 4.

  In the internal combustion engine ignition coil 1, the lead terminal of the secondary coil 7 drawn out from the secondary coil bobbin 8 is drawn out from the flange 18 b located inside the flange 18 a at the end of the secondary coil bobbin 8, and the high voltage terminal 4. Therefore, the length of the lead-out terminal of the secondary coil 7 is shorter than in the conventional case.

  Therefore, the ignition coil 1 for an internal combustion engine is provided with a necessary distance L between the connection terminal 17 and the secondary coil 7 serving as a lead terminal of the secondary coil 7 and between the connection terminal 17 and the insulating case 2. Even if the withstand voltage around the lead terminal of the secondary coil 7 is secured, the space provided for securing the withstand voltage may be small around the connection terminal 17 serving as the lead terminal of the secondary coil 7. It can be downsized.

  In the first embodiment, the terminal wire of the secondary coil 7 is connected to the connection terminal 17, and the lead terminal of the secondary coil 7 drawn out from the secondary coil bobbin 8 is configured by the connection terminal 17. However, the terminal wire of the secondary coil 7 is pulled out from the second rod 18b located inside the rod 18a at the end of the secondary coil bobbin 8, and the lead terminal of the secondary coil 7 is connected to the terminal of the secondary coil 7. It may be constituted by a wire, and the terminal wire of the secondary coil 7 may be directly connected to the high voltage terminal 4.

DESCRIPTION OF SYMBOLS 1 Ignition coil for internal combustion engines 2 Insulating case 2a Side wall 3 High pressure cylinder part 4 High voltage terminal 5 Primary coil 6 Primary coil bobbin 7 Secondary coil 8 Secondary coil bobbin 9,10 Iron core 17 Connection terminal 18 鍔

Claims (2)

  An iron core that has a high-pressure cylinder projecting outward, winds the primary coil and the secondary coil, and magnetically couples the cylindrical primary coil bobbin and secondary coil bobbin arranged concentrically, An ignition coil device for an internal combustion engine that is configured by a high-voltage terminal and an insulating case that accommodates the high-pressure terminal and the axis of the secondary coil intersects at a substantially right angle, and the secondary coil bobbin is A plurality of scissors are provided at intervals, a secondary coil is divided and wound between each scissors, and a secondary coil lead-out terminal that is drawn out from the secondary coil bobbin is an end of the plurality of scissors. An ignition coil for an internal combustion engine, wherein the ignition coil is pulled out from a bag inside the bag and connected to a high voltage terminal.   The drawing terminal is a connecting terminal to which a terminal at the end of winding of the secondary coil is connected to one end, and one end of the connecting terminal is disposed in a plurality of hooks inside the hooks of the end part and pulled out. The ignition coil for an internal combustion engine according to claim 1, wherein the other end is in contact with the high voltage terminal.

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