JP2000170636A - Ignition device for intenal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable offset adjusting even if the center of a rocker cover and the center of a plug tube are shifted, by making a metallic bush buried in a flange in an ellipse shape when attaching an ignition device to an engine side rocker cover by the flange provided thereon. SOLUTION: An ignition device stores coil parts such as a secondary coil, a first coil in a thermoplastic resin case 6, and each coil parts are isolated by an epoxy resin and the like. These components are concentrically disposed in an order which is a center core, a secondary coil, a primary coil, a case 6, and a side core 1 from inside to outside. High voltage generated in the secondary coil applied to an ignition plug 50 through a high voltage terminal, a spring and the like. The above mentioned ignition device is fixed to a rocker cover 30 by a bolt 20 at a flange 7, and at that time, by making a metallic bush 8 buried in the flange 7 in an ellipse shape, the ignition device is allowed to offset-adjust to the rocker cover center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device for an internal combustion engine, and more particularly to a mounting structure of a cylindrical ignition device for an internal combustion engine which is housed in a plug hole and is used directly connected to an ignition plug.

[0002]

2. Description of the Related Art As a conventional ignition device for an internal combustion engine, for example, as described in Japanese Patent Application Laid-Open No. 9-2222067, no special consideration is given to a mounting metal bush provided on a flange portion. Engine side plug hole (plug tube)
The deviation between the center and the center of the rocker cover on the engine side is not constituted by the inner diameter of the metal bush to absorb those errors.

[0003]

The ignition device is inserted into a plug hole (plug tube) of an engine, connected to a spark plug, and fixed to a rocker cover of the engine by bolts. At this time, if the center position of the cylinder head side and the center position of the rocker cover side of the engine are misaligned between the inner periphery of the plug tube press-fitted into the cylinder head of the engine and the outer core of the ignition device, the plug tube and the side core, The plug tube and the side core interfere due to the relationship between the cover and the plug hole seal, and the interference is further increased by the bolt tightening.

[0004] This interference causes a problem that the side core is flawed by interference due to vibration of the engine or the like.

[0005]

According to the present invention, there is provided a structure having a flange for mounting an ignition device to an engine side rocker cover, wherein a metal bush embedded in the flange has an elliptical shape. By doing so, it is possible to adjust the offset even if the center of the engine side rocker cover and the center of the plug tube are misaligned, so that excessive force is not applied to the side core even if the mounting bolt is tightened,
It has the effect of eliminating interference flaws.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

[0007] A primary coil is wound around a primary bobbin formed of a thermoplastic resin (not shown). Φ for the primary coil
An enameled wire having a thickness of about 0.3 to 1.0 mm is wound in several layers, several tens of times per layer.

A secondary bobbin formed of a thermoplastic resin (not shown) is disposed between a center core (not shown) and a secondary coil, and also has a role of insulating a high voltage generated in the secondary coil. To insulate the high voltage generated in the secondary coil,
Flexible epoxy is injected, cured and fixed. The secondary coil is wound about 10,000 to 30,000 times in total using an enameled wire having a wire diameter of about 0.03 to 0.06 mm.

The case 6 is formed by molding with a thermoplastic resin. The center core is formed by pressing and laminating a silicon steel sheet or a directional silicon steel sheet having a thickness of 0.2 to 0.5 mm. The side core 1 is formed by rolling a silicon steel sheet or a directional silicon steel sheet having a thickness of 0.2 to 0.5 mm into a tube and stacking one to four sheets.

The coil portions such as the secondary coil and the primary coil are inserted into the case 6 and insulate high voltage with an insulating layer such as epoxy resin. These components include a center core, a secondary coil, a primary coil, a case 6, a side core 1 from the inside.
Are arranged concentrically.

The high voltage generated by the secondary coil is supplied to the ignition plug 50 via a high-voltage terminal (not shown), a spring, and the like. The part where the ignition plug 50 is inserted is insulated by a plug seal 8 made of silicon rubber or the like.

At one end of the center core or at both ends of the center core, a magnet (not shown) for generating a magnetic flux in a magnetic path in a direction opposite to a magnetic flux formed by the primary coil is provided. An igniter 10 is installed above the coil unit.

The igniter constructed as described above has a flange 7 having a mounting hole (elliptical shape) for mounting the bolt to the rocker cover 30 of the engine. The rocker cover 30 has an oil seal 5 for waterproofing and dustproofing, and is fitted to the plug tube 2. For the same purpose, a plug hole seal 3 made of a material such as silicon rubber is provided at the upper end of the case 6.

The ignition plug 50 is inserted into the plug tube 2 installed in the engine plug hole 25,
Connected to Even if the center of the hole of the engine-side rocker cover 30 is displaced from the center of the plug tube 2, the offset can be adjusted.

[0015]

The bush 8 embedded in the flange 7
Is oval, even if the center positions of the engine rocker cover 30 and the cylinder head 40 (plug tube 2) are shifted, the offset can be adjusted, and the interference between the side core 1 and the plug tube 2 of the ignition device is reduced by the elliptical bushing. 8 can be absorbed. Therefore, a mounting structure that does not damage the side core 1 of the ignition device is possible.

Further, even with a cylindrical ignition device having a structure in which a side core is provided inside a case, a mounting structure that does not damage the outer periphery of the case is possible.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Side core, 2 ... Plug tube, 3 ... Plug hole seal, 5 ... Oil seal, 6 ... Case, 7 ... Flange, 8 ... Bush, 9 ... Connector, 10 ... Igniter,
11: case bud, 20: bolt, 25: plug hole, 30: rocker cover, 40: cylinder head, 5
0: Spark plug.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryoichi Kobayashi 2520 Address, Oaza Takaba, Hitachinaka City, Ibaraki Prefecture Inside the Hitachi, Ltd.Automotive Equipment Division (72) Inventor Kazutoshi Kobayashi 2520 Address Oita Takaba, Hitachinaka City, Ibaraki Prefecture Stock Company (72) Inventor Masaru Ujikawa 2477 Takaba, Hitachinaka City, Ibaraki Prefecture Inside Hitachi Car Engineering Co., Ltd. (72) Makio Takahashi 2520 Takada, Hitachinaka City, Ibaraki Prefecture Hitachi, Ltd. 3G019 CA00 KA23 KC05 KC07 KC10

Claims (1)

[Claims] 1. A center core, a primary coil, a secondary coil and a case for accommodating them are provided. A side core is provided on the outer periphery of this case, and a tip end of the case is provided in a plug hole provided in an engine. A plug seal is provided to facilitate connection with the spark plug and to ensure insulation. Further, on the side opposite to the plug seal provided in the case, the purpose is to waterproof the plug hole. A connector connector provided with a plug hole seal and further provided with an igniter for interrupting the primary current of the coil is provided integrally with the case and provided with a waterproof connector for making an electrical connection to the outside. In the metal bush burying structure of the flange portion to be attached to the internal combustion engine, the inner diameter of the metal bush is made elliptical. .