JP5956973B2 - Ignition coil for internal combustion engines - Google Patents

Description

  The present invention relates to an ignition coil that supplies a high voltage to an ignition plug provided in an internal combustion engine, and more particularly to a terminal provided in a secondary bobbin that winds a secondary winding.

  Conventionally, the specifications of an ignition coil for an internal combustion engine have been changed depending on the required output voltage and the type of engine, and a case, a connector, a primary coil, a secondary coil, and an iron core can be used according to the specifications of the ignition coil. Need to change. In such an ignition coil, the cost increases due to the change of the shape of the part depending on the specifications, and the production efficiency deteriorates due to the change of the assembly jig and the machine at the time of manufacture. In order to solve such a problem, there is known an ignition coil that does not need to facilitate a plurality of types of secondary bobbins according to the specifications of the ignition coil. For example, Japanese Patent Application Laid-Open No. 2008-166649 ( The following "Patent Document 1") is proposed.

  The secondary bobbin terminal A of the ignition coil for an internal combustion engine of Patent Document 1 is shown in FIG. 7 (a), the secondary bobbin terminal B is shown in FIG. 7 (b), and the secondary bobbin terminal C is shown in FIG. 7 (c). In the ignition coil of Patent Document 1, the secondary bobbin is provided with a housing portion for housing a false ignition prevention diode for preventing erroneous ignition at an unexpected ignition timing at an end of the secondary bobbin, On both sides of the housing portion, there are provided fitting portions on which a secondary bobbin terminal A200, a secondary bobbin terminal B300, and a secondary bobbin terminal C400, which will be described later, are fitted and fitted by press-fitting so as to sandwich the housing portion.

  The secondary bobbin terminal A200 forms a U-shaped portion 250 by forming one end 230 and the other end 240, which are formed by bending a thin plate of conductive material into a U-shape at both ends. The one end 230 is provided with a drilling portion 210 that penetrates a thin plate extending from the center to the end portion between the end portions of the one end 230 from the bent portion, and has a U-shape from the center of the U-shaped portion 250. A thin plate protrusion 220 extending in a direction perpendicular to the bending direction of the U-shaped portion 250 and parallel to the surfaces of the one end 230 and the other end 240 of the U-shaped portion 250 is provided in the middle of the protrusion 220. An arc portion 260 is formed in a substantially arc shape, and the tip of the protruding portion 220 is configured to protrude in the direction in which the one end 230 is positioned.

  Further, the secondary bobbin terminal B300 is formed by bending a thin plate of a conductive material into a U-shape at both ends and forming one end 330 and the other end 340. The one end 330 is provided with a drilling portion 310 passing through a thin plate extending from the center to the end portion between the end portions of the one end 330 from the bent portion, and the other end 340 with respect to the surface of the other end 340. In the parallel direction, a protruding portion 320 is formed that protrudes with a constant width in the direction perpendicular to the bending direction of the other end 340 and a slightly larger tip width.

  Further, the secondary bobbin terminal C400 forms a mounting portion 430 having a mounting surface on which a thin plate of a conductive material is bent into an L shape and mounted on one side of the fitting portion of the secondary bobbin. The other side bent and formed into an L-shape forms protrusions 410 and 420 that extend in a straight line from both ends of the mounting surface in a direction perpendicular to the mounting surface of the mounting part 430. It is described that it is slightly longer than the protrusion 420 and that the tip of the protrusion 420 is slightly wider.

JP 2008-166649 A

  However, the above-described conventional ignition coil for an internal combustion engine has the following problems. In other words, in Patent Document 1, only the secondary bobbin terminal is used as necessary, so that the parts constituting the ignition coil such as the case, the secondary bobbin, etc. are shared. The interval between the two is short, and the cost is reduced by using an ignition coil that supplies the minimum output according to the engine specifications. Since low-cost vehicles and high-performance vehicles are mixed, the parts that make up the ignition coil are modeled. If it is changed every change, a huge cost is incurred.

  The present invention has been made in view of the above-described problems. The cost increase caused by the change in the configuration of the secondary coil in particular due to the change in the specification of the ignition coil, and the deterioration of the production efficiency due to the change of the assembly jig or machine at the time of manufacture. It is an object to provide an ignition coil for an internal combustion engine that can be prevented.

In order to solve the above problems, the present invention has the following configuration of an ignition coil for an internal combustion engine. That is, a central iron core and an outer peripheral iron core, a primary coil in which a primary winding is wound around a primary bobbin, and a secondary coil in which a secondary winding is wound around a secondary bobbin, An internal combustion engine ignition coil in which a high voltage generated in the secondary coil is supplied to an ignition plug,
The secondary bobbin has a flange disposed in the vicinity of the axial end of the central iron core and a secondary bobbin in which the end of the secondary winding is bound to the axial direction of the central iron core. And a terminal,
The flange is provided with a plurality of attachment locations provided in a state of circling the outer periphery with respect to the radial direction, and the secondary bobbin terminal is fixed to one of the plurality of attachment locations.

Preferably, the attachment location is a fitting portion into which the secondary bobbin terminal is inserted.

  As described above, the secondary bobbin forms a flange at the axial end of the central iron core, and the flange forms a plurality of attachment portions with respect to the outer periphery in the radial direction, and selects one of the plurality of attachment portions. By arranging the secondary low-voltage terminal, the secondary bobbin and the secondary low-voltage terminal are widely used in the same standard even if the connection position between the secondary coil and the primary coil is changed due to the specification change of the ignition coil. Therefore, it is possible to realize an ignition coil for an internal combustion engine that can prevent an increase in cost due to a change in parts and a deterioration in production efficiency due to a change in an assembly jig or a machine at the time of manufacture.

  The secondary bobbin forms a flange at the axial end of the central iron core, and the flange forms a plurality of attachment portions with respect to the outer periphery in the radial direction, and selects one of the plurality of attachment portions. By arranging the secondary high-voltage terminal, the secondary bobbin and secondary high-voltage terminal can be used universally with the same standard even if the winding end position of the secondary winding is changed according to the specifications of the ignition coil, and the parts change An ignition coil for an internal combustion engine that can prevent an increase in cost and deterioration in production efficiency due to changes in assembly jigs and machines during manufacture can be realized.

  Also, the flange circulates on the outer periphery in the radial direction to form a fitting portion for inserting the secondary low-voltage terminal and / or the secondary high-voltage terminal, so that the secondary low-voltage terminal with respect to 360 ° in the radial direction of the flange. And / or a secondary high voltage terminal can be arrange | positioned (Claim 3).

  Further, the secondary low voltage terminal and the secondary high voltage terminal are provided with the respective terminals at both ends in the axial direction of the secondary bobbin, so that the range in which the secondary low voltage terminal and the secondary high voltage terminal are arranged is expanded.

It is side surface sectional drawing which shows the ignition coil for internal combustion engines which is the 1st Example of this invention. 1 is a block diagram of an ignition coil according to a first embodiment. It is a figure which shows the secondary bobbin, secondary low voltage terminal, and secondary high voltage terminal of the ignition coil of Example 1. It is the figure which connected the secondary low voltage terminal and the secondary high voltage terminal to the secondary bobbin of Example 1. It is a figure which shows the secondary bobbin used as the modification of Example 1, and a secondary low voltage | pressure terminal. It is a figure which shows the rib formed in the terminal fixing flange of the secondary bobbin made into the modification of Example 1. FIG. The secondary bobbin terminal A of the ignition coil for an internal combustion engine of Patent Document 1 is shown in (a), the secondary bobbin terminal B in (b), and the secondary bobbin terminal C in (c).

  An example showing the embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 is a side sectional view showing an ignition coil for an internal combustion engine according to a first embodiment of the present invention, FIG. 2 is a block diagram of the ignition coil, a secondary bobbin of the ignition coil, a secondary low voltage terminal, and FIG. 3 is a diagram showing a secondary high-voltage terminal, FIG. 4 is a diagram showing a secondary bobbin connected to a secondary low-voltage terminal and a secondary high-voltage terminal, and FIG. 4 is a modified secondary bobbin and secondary low-voltage terminal. FIG. 5 is a view showing the ribs, and FIG. 6 is a view showing ribs formed on the terminal fixing flange of the secondary bobbin as a modified example.

  1 to 3, an ignition coil 100 for an internal combustion engine is disposed on the outer periphery of an iron core having a closed magnetic circuit structure in which a central iron core 30 and an outer iron core 40 formed from a silicon steel plate are combined. The coil part is composed of a primary coil 10 and a secondary coil 20 disposed on the outer periphery of the primary coil 10. The primary coil 10 is formed by winding a primary winding 14 made of enamel-coated copper wire around the outer periphery of a resin-made primary bobbin 12 around 100 turns. Further, the secondary coil 20 is configured by winding a secondary winding 23 having a diameter smaller than that of the primary winding 14 around the resin secondary bobbin 22 around 10,000 turns.

  The coil portion is housed in a case 70 formed of an insulating resin and opened in the upper surface in the vertical direction. The coil portion is filled with a thermosetting mold resin 80 to perform physical fixation and electrical insulation. Further, a connector 74 for supplying a power supply voltage and an ignition signal from an externally provided battery 90 and ECU (engine control unit) to the primary coil 10 is formed on the side surface of the case 70. .

  In addition, the ignition coil 100 is formed with a mounting flange 76 in the case 70 for mounting and fixing to the engine head, and the voltage from the battery 90 is boosted by the coil portion on the bottom surface of the case 70 so that the ignition plug A high voltage tower 72 having a high voltage terminal 72a for supplying to 92 is formed. Further, in the case 70, an igniter 94 composed of a switching element for supplying an ignition signal to the primary coil 10 is accommodated.

  The primary coil 10 has a low voltage side connected to the battery 90 and a high voltage side connected to the igniter 94. Further, the secondary coil 20 is connected to the low voltage side of the primary coil 10 via a diode 96 on the low voltage side, and connected to the spark plug 92 on the high voltage side.

  Further, the secondary bobbin 22 forms a winding fixing flange 28 for fixing the secondary winding 23 wound around the winding body 24. Further, a low-pressure side terminal fixing flange 26a and a high-pressure side terminal fixing flange 26b are formed at both ends of the secondary bobbin 22.

  The low voltage side terminal fixing flange 26a formed on the low voltage side of the secondary coil 20 is provided with a secondary low voltage terminal 50 that binds the winding start end of the secondary winding 23. Further, the high-voltage side terminal fixing flange 26b formed on the high-voltage side of the secondary coil 20 is provided with a secondary high-voltage terminal 60 that binds the end of winding of the secondary winding 23.

  Further, the secondary low-voltage terminal 50 and the secondary high-voltage terminal 60 are inserted and fixed to the outer circumference in the radial direction with respect to the secondary bobbin 22 of the low-voltage side terminal fixing flange 26a and the high-voltage side terminal fixing flange 26b. A portion 27 is formed. Further, the fitting portion 27 circulates on the outer circumferences of the low-voltage side terminal fixing flange 26a and the high-voltage side terminal fixing flange 26b, and the secondary low-voltage terminal 50 and the secondary high-voltage terminal 60 are connected to the secondary bobbin. The mounting location can be changed freely in 22 radial directions.

  The secondary low voltage terminal 50 includes a low voltage side winding portion 54 that binds a winding start end portion of the secondary winding 23 and a connection portion 52 that is inserted into the fitting portion 27. Further, the secondary high voltage terminal 60 includes a high voltage side fastening portion 64 that binds a winding end portion of the secondary winding 23, a high voltage terminal connection portion 66 that connects a tip 66a to the high voltage terminal 72a, The connecting portion 62 is inserted into the fitting portion 27.

  Further, in FIG. 4, FIG. 4A is a diagram in which the secondary low voltage terminal 50 and the secondary high voltage terminal 60 are inserted into the surface of the secondary bobbin 22 on the high voltage terminal 72 a side. In the secondary low voltage terminal 50, when the connecting portion 52 is inserted into the fitting portion 27, only the low voltage side winding portion 54 is protruded from the low voltage side terminal fixing flange 26a. Further, when the connecting portion 62 is inserted into the fitting portion 27, the secondary high voltage terminal 60 is in a state where the high voltage side winding portion 64 and the high voltage terminal connecting portion 66 protrude from the high voltage side terminal fixing flange 26b. Become.

  4B, the secondary low-voltage terminal 50 is inserted into a surface of the secondary bobbin 22 facing the opening surface of the case 70, and the secondary high-voltage terminal 60 is inserted into the secondary bobbin 22. FIG. 6 is a view inserted with respect to a surface on the high voltage terminal 72a side. In the secondary low voltage terminal 50, when the connecting portion 52 is inserted into the fitting portion 27, only the low voltage side winding portion 54 is protruded from the low voltage side terminal fixing flange 26a. Further, when the connecting portion 62 is inserted into the fitting portion 27, the secondary high voltage terminal 60 is in a state where the high voltage side winding portion 64 and the high voltage terminal connecting portion 66 protrude from the high voltage side terminal fixing flange 26b. Become.

  The secondary low-voltage terminal 50 and the secondary high-voltage terminal 60 are attached to the primary coil and the high-voltage terminal according to the type of the ignition coil 100 in addition to FIGS. The connection position with 72a and the shape of the case 70 are changed.

  With the above configuration, the secondary low voltage terminal 50 and the secondary high voltage terminal 60 are inserted and fixed to the outer circumference in the radial direction of the low voltage side terminal fixing flange 26a and the high voltage side terminal fixing flange 26b with respect to the secondary bobbin 22. The fitting portion 27 is formed, and the fitting portion 27 circulates on the outer periphery of the low-pressure side terminal fixing flange 26a and the high-voltage side terminal fixing flange 26b, and the secondary low-voltage terminal 50 and the secondary By changing the mounting position of the high voltage terminal 60 in the radial direction of the secondary bobbin 22, the connection position of the secondary coil 20 and the primary coil 10 can be changed by changing the specifications of the ignition coil 100. Even if it is changed, the secondary bobbin 22, the secondary low voltage terminal 50, and the secondary high voltage terminal 60 can be widely used in the same standard, and the cost is increased by changing the parts, and the assembly jig is manufactured. And production efficiency due to machine changes Deterioration can be prevented.

  As a modification of the first embodiment, the secondary bobbin 22 has only the secondary low-voltage terminal 50 fixed by the fitting portion 27 formed on the low-voltage side terminal fixing flange 26a so that the mounting position can be freely set. It is good also as a structure which can be changed, and it is good also as a structure which can fix only the said secondary high voltage terminal 60 with the said fitting part 27 formed in the said high voltage | pressure side terminal fixing flange 26b, and can change an attachment position freely. The low-pressure side and high-pressure side fixing flanges 26a and 26b form the fitting portion 27 that circulates in the radial outer periphery with respect to the secondary bobbin 22 axis. The fitting part 27 may be formed in the part. Further, as shown in FIG. 5, the shape of the fitting portion 27 is such that the connecting portion 52 provided in the secondary low-voltage terminal 50 and the connecting portion 62 provided in the secondary high-voltage terminal 60 are inserted. The mounting portions 27a, 27b, 27c, 27d may be formed on the low-pressure side and high-pressure side fixing flanges 26a, 26b. You may change arbitrarily.

  In addition, the shapes of the low-voltage side winding portion 54 and the connection portion 52 provided in the secondary low-voltage terminal 50 may be arbitrarily changed according to design circumstances, or the shape provided in the secondary high-voltage terminal 60 The shapes of the high voltage side winding portion 64, the high voltage terminal connection portion 66, and the connection portion 62 may be arbitrarily changed according to design circumstances. Further, the secondary high-voltage terminal 60 is provided with the high-voltage terminal connection portion 66 that is electrically connected to the high-voltage terminal 72a provided in the high-voltage tower 72. The secondary high voltage terminal 60 may be provided with the connection portions 66 individually.

  Further, as shown in FIG. 6, ribs 29 may be formed at equal intervals on both sides of the fitting portion 27 provided on the low-pressure side terminal fixing flange 26a and the high-pressure side fixing flange 26b. Thereby, when the secondary low voltage terminal 50 and the secondary high voltage terminal 60 are inserted into the fitting portion 27, the connecting portions 52, 62 provided on the secondary low voltage terminal 50 and the secondary high voltage terminal 60 are The rib 29 is securely fixed.

12: primary bobbin
14: Primary winding
22: Secondary bobbin
23: Secondary winding
24: Winding body
26a: Low voltage terminal fixing flange
26b: High-voltage terminal fixing flange
27: Mating part
27a to 27d: Mounting part
28: Winding fixing flange
29: Rib
30: Central iron core
40: Outer iron core
50: Secondary low voltage terminal
52: Connection part
54: Low voltage side winding part
60: Secondary high-voltage terminal
62: Connection part
64: High-pressure side winding part
66: High voltage terminal connection
66a: Tip
100: Ignition coil

Claims (2)

Comprising a central iron core and an outer peripheral iron core, a primary coil primary winding to the primary bobbin is wound, and the secondary coil secondary winding to the secondary bobbin is wound, the said 2 An internal combustion engine ignition coil in which a high voltage generated in a secondary coil is supplied to an ignition plug ,
The secondary bobbin has a flange disposed in the vicinity of the axial end of the central iron core and a secondary bobbin in which the end of the secondary winding is bound to the axial direction of the central iron core. And a terminal,
The flange is provided with a plurality of attachment points provided in a state of rotating around the outer periphery with respect to the radial direction, and the secondary bobbin terminal is fixed to one of the plurality of attachment points. An ignition coil for an internal combustion engine. The ignition coil for an internal combustion engine according to claim 1, wherein the attachment location is a fitting portion into which the secondary bobbin terminal is inserted.

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