JP2005317717A - Ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil for internal combustion engine that can decrease the height as an internal combustion ignition coil for supplying spark discharge high voltage in automobile engine sparking plugs. <P>SOLUTION: This ignition coil comprises at least a primary coil 11, a secondary coil 12, a center core 13 passing the inner of the primary coil, and a side core 14 passing the outer of the secondary coil that combines both coils magnetically. To decrease the height, the primary coil, secondary coil, center core and side core are housed in a case integrating both a harness for supplying voltage to the ignition coil and a connectable portion, perpendicularly or with a little more declination for the sparking plug axis of the internal combustion engine; the metal plate surface or bottom side of a switching device 16 for cutting the current electrified to the primary coil is placed adjacent and approximately parallel to the outer surface of the side core passing the outer; coils made of the primary and secondary coil and the welding part connecting the switching device and the outer are placed along the starter plug axis of the side core, and their positions are nearer to the sparking plug than the end face in the reverse direction for the sparking plug, in an internal combustion engine ignition coil placed where the switching device terminals have been placed in a reverse direction for the sparking plug. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  FIG. 5 is a longitudinal sectional view of a conventional ignition coil for an internal combustion engine. Here, the symbols in the figure will be briefly described. The center iron core 13 and the side iron core 14 that form a closed magnetic circuit are wound around the outer circumference of the center iron core 13 and energized to excite the center iron core 13 and the side iron core 14. The primary coil 11 and the secondary coil 12 wound around the outer periphery of the primary coil 11, the insulating material 19 that insulates them, and the switching element 16 that cuts off the energization of the primary coil 11 are the outer peripheral surface of the side iron core 14. The base 51 is disposed adjacent to 41. The connection terminal 52 of the switching element 16 extends at the upper end and is bent into a bowl shape.

A storage case 15 having a connector 71 for connecting these components to the outside of the ignition coil in order to supply current to the internal primary coil 11 is shown.
Further, the connection terminal 6 of the winding part configured as described above and the connection terminal 52 of the switching element 16 are connected by the connection structure part 8. Usually, the connection structure 8 inside the ignition coil and the work space 81 for the welding electrode are arranged on the opposite side of the ignition plug from the end surface 14a of the side iron core 14 on the opposite side to the ignition plug (not shown) of the internal combustion engine. It is.

  However, in the conventional ignition coil for an internal combustion engine, since the connection structure 8 is arranged on the opposite side of the ignition plug of the end surface 14a of the side iron core 14, the overall height H0 of the ignition coil from the mounting surface of the internal combustion engine becomes large. There was a drawback that consideration must be given to layout.

  The present invention has been proposed in view of the above, and an object of the present invention is to provide a structure that can improve the layout by reducing the overall height of the ignition coil.

  In order to achieve the above object, an ignition coil for an internal combustion engine according to the present invention comprises at least a primary coil and a secondary coil, a center core passing through the inner periphery of the primary coil for magnetically coupling the two coils, and the A side iron core that passes through the outer periphery of the secondary coil, and the primary coil, the secondary coil, the center iron core, and the side iron core are inclined at right angles or slightly from the right angle with respect to the direction of the ignition plug of the internal combustion engine. The metal plate surface of the switching element for interrupting the current supplied to the primary coil on the outer peripheral surface of the side iron core that passes through the outer periphery and is accommodated in the storage case integrally formed with the connecting harness and connectable part In an ignition coil for an internal combustion engine in which the bottom side is adjacent substantially in parallel and the terminal portion of the switching element is installed in a direction opposite to the ignition plug, the primary coil and the secondary coil are included. Welds to connect the switching element and the outer winding portion is characterized in that it is installed on the spark plug side from the end surface of the spark plug and the opposite direction in the axial direction of the spark plug of the side core.

  The invention according to claim 2 is characterized in that the welded portion includes a part of a work space for inserting a welding electrode for welding.

  Further, in the invention described in claim 3, the terminal for connection of the winding portion is formed on the spark plug side from the end face of the side iron core in the direction of the spark plug axis and in the direction opposite to the spark plug.

  Further, in the invention according to claim 4, the welding terminal of the winding portion is a position where the switching element is retracted from a work space required when the switching element passes the center iron core through the inner periphery of the winding portion in plan view. It is characterized by being installed in.

  Further, in the invention according to claim 5, when the switching element is finally disposed in the work space of the center core in plan view, the switching element is installed so as to avoid the work space of the center core. .

  Further, the invention according to claim 6 is characterized in that a part of the storage case that also serves as a work space for inserting the welding electrode for welding is formed in a convex shape on the outer peripheral side.

  The invention according to claim 7 is characterized in that the welded portion is welded by any one of squeeze welding, parallel welding, laser welding, and micro arc welding.

  Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.

  According to the first aspect of the present invention, at least a primary coil and a secondary coil, a center iron core that passes through the inner circumference of the primary coil that magnetically couples the two coils, and a side iron core that passes through the outer circumference of the secondary coil. A connecting portion connectable to a harness for supplying power to the ignition coil with the primary coil, the secondary coil, the center iron core and the side iron core being inclined at right angles or slightly from the right angle with respect to the ignition plug axial direction of the internal combustion engine. The metal plate surface or bottom side of the switching element for cutting off the current supplied to the primary coil is adjacent to the outer peripheral surface of the side iron core that passes through the outer periphery and is substantially parallel to the outer periphery. An internal combustion engine ignition coil in which a terminal portion of an element is installed in a direction opposite to a spark plug, a winding portion including the primary coil and a secondary coil, a switching element, Since welds connecting the section is installed in the spark plug side from the end surface of the spark plug and the opposite direction in the axial direction of the spark plug of the side core, it is possible to reduce the overall height. In addition, the layout can be improved.

  In the invention according to claim 2, since the weld portion includes a part of a work space for inserting a welding electrode for welding, the overall height can be lowered.

  In the invention according to claim 3, since the terminal for connecting the winding portion is formed on the spark plug side from the end face in the direction opposite to the spark plug in the spark plug axial direction of the side iron core, the overall height can be lowered. it can.

  According to a fourth aspect of the present invention, the terminal for welding of the winding portion is installed at a position retracted from a work space required when the switching element passes the center core through the inner periphery of the winding portion in a plan view. Therefore, even if the total height is lowered, the welding terminal of the winding portion does not interfere with the insertion work of the center core.

  In the invention according to claim 5, when the switching element is finally disposed in the work space of the center core in plan view, the switching element is installed so as to avoid the work space of the center core. The total height can be lowered without interfering with the insertion work.

  In the invention of claim 6, since a part of the storage case that also serves as a work space for inserting the welding electrode for welding is formed in a convex shape on the outer peripheral side, the welded portion can be reliably welded, The work space of the welding electrode during welding can be reduced.

  In the invention according to claim 7, since the welded portion is welded by any one of squeeze welding, parallel welding, laser welding, and micro arc welding, the welded portion can be reliably welded.

  By installing the welded part that connects the winding part with the switching element and the outside in the axial direction of the spark plug of the side iron core and closer to the spark plug side than the end face opposite to the spark plug, the overall height of the ignition coil for the internal combustion engine The purpose of lowering can be achieved.

  An embodiment of the present invention will be described below. FIG. 1 is a longitudinal sectional view showing an example of an ignition coil for an internal combustion engine according to the present invention, and FIG. 2 is a plan view of the ignition coil for an internal combustion engine according to the present invention. Here, the ignition coil 10 for an internal combustion engine includes at least a primary coil 11 and a secondary coil 12, a center iron core 13 passing through an inner periphery of the primary coil 11 that magnetically couples the two coils, and the secondary coil. 12 has a side iron core 14 passing through the outer periphery of the coil 12, and the primary coil 11, the secondary coil 12, the center iron core 13, and the side iron core 14 are inclined at right angles or slightly from the right angle with respect to the direction of the ignition plug of the internal combustion engine. Switching for interrupting the current supplied to the primary coil 11 on the outer peripheral surface of the side iron core 14 that is accommodated in the integrally formed storage case 15 with a connecting portion that can be connected to a harness for supplying power and the like. The ignition plate for an internal combustion engine in which the metal plate surface or bottom surface side of the element 16 is adjacent in parallel and the terminal portion 16a of the switching element 16 is installed in the opposite direction to the ignition plug. In this case, a welded portion 17 that connects the winding portion composed of the primary coil 11 and the secondary coil 12 to the switching element 16 and the outside is disposed in the axial direction of the spark plug of the side iron core 14 in the direction opposite to the spark plug. It is installed closer to the spark plug than the end face 14a.

  Further, as shown in an enlarged view in FIG. 2, the welded portion 17 is included in a work space 81 for inserting a welding electrode for welding. In addition, the storage case 15 is formed with a convex portion 15b on the outer peripheral side in order to secure a work space 81 for inserting a welding electrode (not shown) for welding. Further, the connection terminal 6 of the winding portion extends in the direction in which the switching element 16 is installed and is bent downward in a bowl shape. Further, the terminal portion 16a of the switching element 16 is also bent rightward in a bowl shape. Projections are formed on the welded portion 17 and can be welded by being sandwiched between welding electrodes. As other welding methods, parallel welding, laser welding, micro arc welding, or the like can be optimally used.

  FIG. 3 is a plan view of the ignition coil for an internal combustion engine according to the present invention. Here, the connection terminal 6 for welding the winding portion is in a position (on both sides) retracted from the work space 20 required when the center iron core 13 is passed through the inner periphery of the winding portion in plan view. is set up. Further, when the switching element 16 is finally disposed in the work space 20 of the center core 13 in plan view, the switching element 16 is installed at a position retracted from the work space 20 of the center core 13. Therefore, even when the total coil height H is lowered, the connecting terminal 6 of the winding portion and the switching element 16 do not interfere with the operation when the center iron core 13 is inserted.

  In the ignition coil 10 for an internal combustion engine configured as described above, the welded portion 17 that connects the winding portion to the switching element 16 and the outside has an end face 14a in the axial direction of the ignition plug of the side iron core 14 and in the opposite direction to the ignition plug. Therefore, the overall height H can be lowered.

  FIG. 4 is an enlarged cross-sectional view of the main part showing a second embodiment of the ignition coil for an internal combustion engine of the present invention. In the present embodiment, in order to secure the work space 81, the storage case 15 protrudes from the outer peripheral surface 15 a of the storage case 15 in a convex shape in the outer peripheral direction. Further, the space 18 is formed on the connector 71 in consideration of the counterpart side connected to the connector 71. The dimension of the space 18 is about 1 to 5 mm.

  When configured as described above, since the position of the work space 81 is close to the ignition coil side, the height of the ignition coil 10 for the internal combustion engine can be kept low, and the layout of other equipment can be improved. it can. Further, since the space 18 is formed, the connectivity to the connector 71 can be improved.

FIG. 1 is a longitudinal sectional view showing an example of an ignition coil for an internal combustion engine according to the present invention. FIG. 2 is an enlarged sectional view of a main part of the ignition coil for the internal combustion engine. FIG. 3 is a plan view of the ignition coil for the internal combustion engine. FIG. 4 is an enlarged sectional view of an essential part showing a second embodiment of the ignition coil for the internal combustion engine. FIG. 5 is a longitudinal sectional view showing an example of a conventional ignition coil for an internal combustion engine.

Explanation of symbols

6 Connection terminal of winding part 8 Connection structure
DESCRIPTION OF SYMBOLS 10 Ignition coil 11 for internal combustion engines Primary coil 12 Secondary coil 13 Center iron core 14 Side iron core 14a End surface 15 Storage case 15a Storage case outer peripheral surface 15b Part 16 Switching element 16a Terminal part 17 Welding part 18 Space 19 Insulating material 20 Working space 51 Base 52 Connection terminal 71 Connector 81 Work space

Claims (7)

At least a primary coil and a secondary coil, a center iron core passing through an inner circumference of the primary coil for magnetically coupling the two coils, and a side iron core passing through an outer circumference of the secondary coil, the primary coil, A storage case in which a secondary coil, a center iron core, and a side iron core are integrally formed with a connecting portion that can be connected to a harness that supplies power to the ignition coil by tilting at right angles or slightly from the right angle with respect to the direction of the ignition plug of the internal combustion engine. The metal plate surface or bottom side of the switching element for cutting off the current supplied to the primary coil is adjacent to the outer peripheral surface of the side iron core that is housed and passes through the outer periphery, and the terminal portion of the switching element is opposite to the spark plug. In the internal combustion engine ignition coil installed in the direction,
A welded portion for connecting the winding portion composed of the primary coil and the secondary coil to the switching element and the outside is installed on the spark plug side in the axial direction of the spark plug of the side iron core from the end surface opposite to the spark plug. An ignition coil for an internal combustion engine.   2. The ignition coil for an internal combustion engine according to claim 1, wherein the welded portion includes a part of a work space for inserting a welding electrode for welding.   3. The internal combustion engine ignition according to claim 1, wherein a terminal for connection of the winding portion is formed on the side of the spark plug in the axial direction of the spark plug of the side iron core and on the spark plug side from the end surface opposite to the spark plug. coil.   The welding terminal of the winding part is installed at a position where the switching element is retracted from a work space required when the switching element passes the center core through the inner periphery of the winding part in plan view. The ignition coil for internal combustion engines of any one of 1-3.   5. The switching element according to claim 1, wherein when the switching element is finally disposed in the work space of the center core in plan view, the switching element is installed at a position retracted from the work space of the center core. An ignition coil for an internal combustion engine as described in 1.   6. The internal combustion engine according to claim 1, wherein a part of a storage case that also serves as a work space for inserting the welding electrode for welding is formed in a convex shape on the outer peripheral side. Ignition coil.   The ignition coil for an internal combustion engine according to any one of claims 1 to 6, wherein the welded portion is welded by any one of squeeze welding, parallel welding, laser welding, and micro arc welding.

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