JP5337570B2 - Ignition coil device for internal combustion engine - Google Patents

Description

  The present invention relates to an ignition coil device for an internal combustion engine, and in particular, a high voltage energizing part for energizing a spark plug with a high voltage from a coil part is provided in an insulating resin pipe inserted into a plug hole, and the ignition coil part is The present invention relates to a so-called plug-top type ignition coil device for an internal combustion engine that is integrally attached to the upper end portion (anti-ignition plug side) of this insulating resin portion.

  An ignition coil device for an internal combustion engine attached to a cylinder head portion of an engine described in Japanese Patent Application Laid-Open No. 2003-243234 or the like uses a high voltage generated on the secondary coil side of the coil portion, for example, a high voltage end portion , A first spring, a radio noise suppression resistor, a second spring, etc. are used to energize the spark plug, and the high voltage is applied to one of the spark plugs disposed in the combustion chamber. And an electric discharge is generated between the other electrode grounded through the cylinder head portion.

  It arrange | positions so that reliable connection may be made | formed by the elastic force of the 1st spring and resistance holding terminal which are arrange | positioned at the both ends of the resistance for radio noise suppression.

  In this case, the first spring, the radio noise suppression resistor, the second spring, etc. are arranged in the insulating pipe so that their central axes are substantially aligned, and the radio noise suppression resistor is mounted in the insulating pipe. Yes.

  For this reason, the radio noise suppression resistor is connected to the second spring holding terminal and the second spring via a resistance holding terminal and a resistance connecting terminal configured separately from the resistance holding terminal. I am trying.

JP 2003-243234 A

  However, the above-described ignition coil device for an internal combustion engine has a problem that since the resistance for suppressing radio noise is arranged on the second spring side, the configuration is complicated and the number of man-hours cannot be reduced even during assembly. .

  An object of the present invention is to simplify the installation of a resistor for suppressing radio noise and to reduce the number of work steps or the number of parts.

  In the present invention, in order to achieve the above object, an ignition coil section that generates a high voltage, a high-voltage energization path that transmits the high voltage from the ignition coil section to an ignition plug, and a radio noise provided in the high-voltage energization path A suppression resistor and a high-voltage insulation pipe mounted in the plug hole, the radio noise suppression resistor is provided in the high-voltage insulation pipe, and the ignition coil portion of the high-voltage insulation pipe An epoxy resin for insulation is sealed in a coil case of the ignition coil portion and is integrally attached to the end portion on the plug hole side, and the high voltage passage is provided between the high voltage insulation pipe and the ignition coil portion. In an internal combustion engine ignition coil provided with a resin-sealed terminal for sealing the insulating epoxy resin from flowing out from a hole through which an electric circuit member is inserted, the resin-sealed terminal is a conductive member Formed in a cap shape that protrudes toward the insulating epoxy resin side, and has an electrical connection portion with the ignition coil portion on the surface of the insulating epoxy resin side of the resin-sealed terminal, On the concave side of the resin-sealed terminal, one end outer peripheral portion of the radio noise suppression resistor formed in a cylindrical shape is inserted and electrically connected, and the other end of the radio noise suppression resistor is connected to the other end of the radio noise suppression resistor. The remaining conductor portion for forming the high-voltage current path is provided.

  According to the present invention configured as described above, the resin hole sealing terminal can function as a holding member for the resistor for suppressing radio noise in addition to the electrical connection with the ignition coil and the resin sealing. In particular, the number of parts can be reduced, the cost can be reduced, the number of assembling steps can be reduced, and a product with higher insulation reliability can be obtained.

1 is a cross-sectional view of an internal combustion engine ignition coil according to a first embodiment of the present invention. Sectional drawing of the ignition coil for internal combustion engines which is the 2nd Embodiment of this invention. Sectional drawing of the ignition coil for internal combustion engines which is the 3rd Embodiment of this invention.

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

  Hereinafter, a basic embodiment of the ignition coil for an internal combustion engine in which the present invention is implemented will be described.

  In the present embodiment, the ignition coil unit 1 that generates a high voltage, and the high-voltage energization path (4, 5, 6, 7, 8, 9, 10, and so on) that transmits the high voltage from the ignition coil unit 1 to the ignition plug 12. 11), a radio noise suppression resistor (6) provided in the high voltage current path (4, 5, 6, 7, 8, 9, 10, 11), and a high voltage mounted in the plug hole (PH) An insulation pipe (14) is provided, the radio noise suppression resistor (6) is provided in the high voltage insulation pipe (14), and the ignition coil section (1) is connected to a plug hole ( PH) is integrally attached to the side end portion, and an insulating epoxy resin (101) is sealed in the coil case (100) of the ignition coil portion (1), and the high voltage insulation pipe (14) and the ignition coil are sealed. Insulating air from the electrical conductor outlet hole (56) to the part (1). In the ignition coil for an internal combustion engine provided with a resin-sealed terminal (5) for closing the electric conductor take-out hole (56) in order to prevent the xy resin (101) from flowing out, the resin-sealed terminal (5) is a conductive member. Formed in the shape of a cap that protrudes toward the insulating epoxy resin (101), and the surface of the resin-encapsulated terminal (5) on the insulating epoxy resin (101) side is connected to the ignition coil portion (1). An electrical connection portion (45) is provided, and one end outer peripheral portion of a radio noise suppression resistor (6) formed in a cylindrical shape is inserted into the concave side of the resin-sealed terminal (5) to electrically The remaining conductors (7, 8, 8) are connected to the other end of the radio noise suppression resistor (6) to form a high voltage current path (4, 5, 6, 7, 8, 9, 10, 11). 9, 10, 11).

[First embodiment]
A first embodiment of the ignition coil device according to the present invention will be described with reference to FIG.

  The ignition coil portion IGC is attached to the cylinder head portion 3 of the engine by a bolt 2.

  From the ignition coil side IGC to the ignition plug 12, the component configuration of the energization unit IGS is as follows: high voltage end 4, resin-sealed terminal 5, radio noise suppression resistor 6, resistor connection terminal 7, first spring 8, connection The terminal 9, the second spring holding terminal 10, and the second spring 11 are arranged to energize the spark plug 12.

  By placing the radio noise suppression resistor 6 on the coil side and further improving the shape of the resin-sealed terminal 5, the resin-sealed terminal 5 has a resistance holding function in addition to the conventional sealing function of the insulating epoxy resin 13. The resistance holding function of the terminal 15 can be integrated, and the number of parts can be reduced.

[Second Embodiment]
Next, a second embodiment of the resin-sealed terminal 5 according to the present invention will be described with reference to FIG.

  By making the shape of the coil-side connection portion 5a above the resin-sealed terminal 5 into the recessed shape 5c, the number of connection points with the high-voltage end portion 4 is changed from one to two, and this is a highly reliable connection method.

[Third embodiment]
Next, a third embodiment of the resin-sealed terminal 5 according to the present invention will be described with reference to FIG.

  In the present embodiment, the resistance holding portion 5b of the resin-sealed terminal 5 is provided with a slit 5d so that the press-fitting load and the stress applied to the press-fitting component can be easily adjusted.

  Moreover, the resistance holding part 5b of the resin-sealed terminal 5 can improve the workability at the time of resistance press-fitting for suppressing radio noise by forming the constricted part 5e or the tip thereof into a chamfered shape.

  Furthermore, since the electric field concentrates at the tip of the resistance holding portion 5b, high insulation performance is required. In the present invention, the insulating epoxy resin 13 having high insulation performance is formed around the radial direction of the resistance holding portion 5b. Thus, a structure with high insulation reliability can be obtained.

  According to these embodiments, the following effects are obtained.

  The connection between the resin-sealed terminal 5 and the radio noise suppression resistor 6 is press-fitted. Usually, press-fitting between metals increases the press-fitting load, and fine adjustment of the press-fitting allowance is required to manage it. For this reason, parts with high dimensional accuracy are required, and the cost is high. In addition, since the press-fitting load increases, excessive applied stress acts on the press-fitted parts, leading to cracking of the resistance 6 for suppressing radio noise, and it becomes difficult to ensure the reliability of the parts.

  In this example, at least one of these problems could be solved.

  Although this invention demonstrated what formed the high voltage electricity supply part with two springs, this spring can also be utilized for one thing.

DESCRIPTION OF SYMBOLS 1, IGC Ignition coil part 2 Bolt 3 Cylinder head part 4 High voltage | pressure end part 5 Resin sealing terminal 5a Coil side connection part 5b Resistance holding part 5c Recessed shape part 5d Slit 5e Constriction part 6 Radio noise suppression resistance 7 Resistance connection terminal 8 First spring 9 Connection terminal 10 Second spring holding terminal 11 Second spring 12 Spark plug 13 Insulating epoxy resin 14 High voltage insulating pipe 15 Resistance holding terminal IGS Current-carrying part

Claims (5)

An ignition coil section for generating a high voltage;
A high-voltage energization path for transmitting a high voltage from the ignition coil portion to the ignition plug;
A resistor for suppressing radio noise provided in the high-voltage current path;
It has a high voltage insulation pipe that is installed in the plug hole.
The radio noise suppression resistor is provided in the high voltage insulation pipe,
The ignition coil portion is integrally attached to the plug hole side end of the high voltage insulation pipe,
Insulation epoxy resin is sealed in the coil case of the ignition coil portion,
An internal combustion engine in which a resin-sealed terminal is provided between the high-voltage insulating pipe and the ignition coil portion to seal the insulating epoxy resin from flowing out from a hole through which the high-voltage current path member is inserted. In the ignition coil for
The resin-sealed terminal is formed of a conductive member, and is formed in a cap shape having a convex shape on the insulating epoxy resin side,
On the surface of the insulating epoxy resin side of the resin-sealed terminal has an electrical connection portion with the ignition coil portion,
On the concave side of the resin-sealed terminal, there is a resistance holding portion into which one end outer peripheral portion of the radio noise suppression resistor formed in a cylindrical shape is inserted, and the resistance holding portion is used for the radio noise suppression. Electrically connected to the resistor,
Sealing the insulating epoxy resin from flowing out of the hole at the side surface between the resistance holding portion and the electrical connection portion;
The other end of the radio noise suppression resistor is provided with a remaining conductor portion that forms the high-voltage current path ,
An ignition coil device for an internal combustion engine in which a slit for elastic generation is formed in the resistance holding portion . In claim 1,
An ignition coil device for an internal combustion engine having a recess in a coil side surface portion of the resin injection hole sealing terminal, and a tip of a conductive terminal extending from the ignition coil portion in contact with the recess. In claim 1,
An ignition coil device for an internal combustion engine, wherein the resistance holding portion of the resin injection hole sealing terminal has an elastic portion constricted on the inner peripheral side. In claim 1,
The resistance holding portion of the resin injection hole sealing terminal is an ignition coil device for an internal combustion engine having a chamfered portion at a resistance insertion side end portion for suppressing radio noise. In claim 1,
An ignition coil device for an internal combustion engine, wherein at least a part of the outer periphery of the resin injection hole sealing terminal on the ignition coil side is covered with the insulating epoxy resin.

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