JP2000186660A - Device for interconnecting ignition coil for internal combustion engine and ignition plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent the occurrence of defective contact between the high voltage terminal of an ignition coil and an ignition plug due to resonance with vibration of an engine. SOLUTION: An insulation case 14 to contain a primary coil 11, a secondary coil 12, and a core 13 is fixed across a position above a plug hole 2. An insulation cylinder part 16 to hold a high voltage terminal 17, protruding from the bottom of the insulation case, at an internal part is protruded in the plug hole from above. The upper end part of a conductive relay member 25 is electrically connected to the high voltage terminal of the ignition coil and the lower end part thereof to the top electrode of the ignition plug. In a so formed device to interconnect the ignition coil and the ignition plug, a ball stud 30 is arranged at one of the high voltage terminal of the ignition coil and the upper end part of the conductive relay member positioned opposite to the high voltage terminal, and a recess ball socket 40 oscillatorily receiving the ball part thereof is arranged at the other. The ball part of the ball stud is fitted in the internal part of the recess ball socket, and the high voltage terminal and the conductive relay member are oscillatorily intercoupled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition plug attached to the bottom of each blind plug hole of a cylinder block provided in an internal combustion engine of a vehicle. A connection device between the ignition coil and the ignition plug for supplying a high voltage from the ignition coil to the ignition plug via the relay, more specifically, a high-voltage terminal of the ignition coil in the connection device and an upper end of the conductive relay member of the relay; The present invention relates to a ball joint type swing coupling structure of a lower end portion of a conductive relay member and a top electrode of a spark plug.

[0002]

2. Description of the Related Art As a connecting device between an ignition coil for an internal combustion engine and an ignition plug of an engine, a relay (plug) in which a long metal coil spring is axially disposed in a hollow flexible insulating member. Using a socket), the upper end of the metal coil spring is brought into contact with the high voltage terminal of the ignition coil, and the lower end thereof is brought into contact with the top electrode of the ignition plug to be electrically connected. 5-2117
No. 5 (Utility Model Registration No. 2518587, date of issue Heisei 8
November 27, 2008).

[0003]

The connecting device using the plug socket in which the long metal coil spring is disposed in the hollow insulating member in the axial direction has a simple structure, and is connected to the ignition coil of each cylinder of the engine. It is possible to absorb variations in dimensions (distance) between the ignition plug and the displacement between the ignition coil and the ignition plug when the ignition coil is attached by a long metal coil spring. However, a long metal coil spring resonates with the vibration during operation of the engine and the length of the coil spring expands and contracts. If contact failure occurs temporarily and this is the time to ignite the mixture supplied to the inside of the cylinder by spark discharge of the spark plug, spark discharge occurs in the spark plug. Can not be produced, the performance of the engine is reduced.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by magnetically connecting a primary coil, a secondary coil concentrically fitted to the primary coil, and both coils. A bottomed insulating case that accommodates a penetrating portion of the iron core to be connected, which penetrates the inner periphery of the primary coil and the secondary coil, or the entire iron core, in which a thermosetting insulating resin is cast and filled. An ignition coil for an internal combustion engine having an insulating cylinder portion protruding from a bottom of the case and holding a high-voltage terminal electrically connected to a secondary coil projects from the bottom, with the insulating cylinder portion facing downward and a spark plug attached to the bottom. An upper fitting portion that is fixed across the blind hole-shaped plug hole of the cylinder block of the engine, and that the insulating cylinder portion protrudes into the plug hole from above, and is fitted to the insulating cylinder portion of the ignition coil. , Lower fitting to be fitted to the top electrode of the spark plug When, the linking device consisting of a hollow flexible insulating member made of a relay tube portion connecting the both fitting portions, the conductive relay member disposed axially in the insulating member,
A connection device for an internal combustion engine ignition coil and an engine ignition plug, wherein the upper end of the conductive relay member is electrically connected to the high voltage terminal of the ignition coil and the lower end thereof is electrically connected to the top electrode of the ignition plug. The ball stud is provided on one of the high voltage terminal of the ignition coil and the upper end of the conductive relay member facing the high voltage terminal, and the other is provided with a concave ball socket for receiving the ball portion of the ball stud so as to swing. The ball portion of the stud is fitted into the concave ball socket, and the high voltage terminal and the conductive relay member are swingably connected to each other. The conductive relay member facing the top electrode of the spark plug A concave socket is provided at the lower end of the spark plug to receive the top electrode of the spark plug in a swingable manner, and the top electrode of the ignition plug is fitted into the concave ball socket,
The lower end of the conductive relay member and the top electrode of the spark plug are connected to be swingable.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiments, reference numeral 1 denotes a cylinder block, reference numeral 2 denotes a plug hole which is attached to a bottom through a spark plug, and reference numerals 3 and 3 denote ignitions which stand on the left and right cylinder blocks 1 on the upper surface of the plug hole. Mounting column for coil, 4
Indicates a spark plug, and 5 indicates a top electrode of the spark plug.

Reference numeral 10 denotes an ignition coil, 11 denotes a primary coil thereof, 12 denotes a secondary coil concentrically fitted on the outer periphery of the primary coil, and 13 denotes a closed magnetic circuit for magnetically coupling the two coils 11 and 12. A part of the core is a penetrating portion 13 'penetrating the inner periphery of the bobbin of the primary coil. Reference numeral 14 denotes a resin insulating case having an open top surface which accommodates the primary coil, the secondary coil, and a penetrating portion 13 'of an iron core penetrating the inner periphery of the bobbin of the primary coil.
a and 14a have openings facing each other, and the left and right ends of the bobbin of the primary coil close the openings from the inside of the case. As a result, the primary coil and the secondary coil fitted concentrically are positioned and fixed in the case, and a thermosetting resin, for example, an epoxy resin is placed in the insulating case to insulate the high voltage generated in the secondary coil. Casting, filling and insulating layer 1
When constructing 5, the cast resin does not leak out from each opening of the side wall 14a. In the illustrated embodiment, the secondary coil is fitted concentrically outside the primary coil, but the primary coil may be fitted concentrically outside the secondary coil.

[0007] The remaining portion of the closed magnetic circuit core 13 through which the penetrating portion 13 'penetrates the bobbin of the primary coil is located outside the case. As is well known, the iron core 13 is formed by laminating silicon steel plates.
One facing end of each of the two U-shaped members is fixed to the bobbin of the primary coil with an adhesive or the like, and the other facing end is welded or bonded outside the case. Fix with. A portion extending vertically from each end of the primary coil bobbin of the iron core 13 to the outside of the insulating case 14 has a vertical through-hole. The bolt 6 is passed through the through-hole from above, and the plug hole of the cylinder block is inserted. Screw it into the mounting column 3 that stands from the left and right of
The ignition coil 10 is fixed to the cylinder block. In addition, although the penetration part 13 'of the iron core which penetrated the inner periphery of both the primary and secondary coils is accommodated in the insulating case, the whole iron core may be accommodated in the insulating case. Then, the insulating case is fixed to the cylinder block by an appropriate means.

At the bottom of the lower surface of the insulating case 14, an insulating cylindrical portion 16 for holding a high-voltage terminal 17 connected to a secondary coil on the inner periphery protrudes downward integrally, and this insulating cylindrical portion 16 is formed as described above. When the iron core is fixed on the mounting columns 3 and 3, the core enters the plug hole 2 shallowly from above. Although not shown, the insulating case is provided with a primary terminal seat having a primary terminal to which a primary coil is connected, as is well known. or,
In the illustrated embodiment, the bottom of the insulating case having the insulating cylindrical portion 15 is formed integrally with the case, but is formed separately and fixed to the open bottom of the case by bonding or other appropriate means. The open bottom surface of the case may be closed.

Reference numeral 20 denotes an ignition coil 10 and a plug hole 2
A flexible relay tool for electrically connecting the ignition plug 4 inside the upper portion of the ignition plug 4 to the upper fitting portion 22 fitted on the outer periphery of the insulating tubular portion 16 of the ignition coil and the outer periphery of the top electrode 5 of the ignition plug. A hollow flexible insulating member 21 made of resin or rubber, which is formed of a lower fitting portion 23 to be fitted, a relay tube 24 connecting the two fitting portions, and a resin, rubber, is disposed in the hollow portion of the insulating member in the axial direction. A metal rod and a tubular conductive relay member 25 electrically connected to the high-voltage terminal 17 of the ignition coil at the upper end and to the top electrode 5 of the ignition plug at the lower end, respectively. 25 is an upper part connected by a metal coil spring,
You may comprise with a lower part. The hollow insulating member is formed separately from the upper and lower fitting portions 22 and 23 and the relay tube 24, and each end of the relay tube 24 is inserted into each of the fitting portions 22 and 23 by snap engagement or the like. Or the upper and lower fitting portions 22 and 2
3. The relay tube 24 may be formed integrally.

In the first embodiment shown in FIG. 1, an upward ball stud 30 is provided at the upper end of the conductive relay member of the relay device. The ball stud 30 includes a ball portion 31 having a spherical surface larger than a hemisphere and a small-diameter neck portion 32 connected to an aspherical portion 31 ′ of the ball portion 31, as is well known as a swing type ball joint. Is connected to the upper end of the conductive relay member to direct the ball portion 31 upward.
This ball stud 30 can be cut out when the conductive relay member is manufactured from a rod-shaped conductive material such as aluminum or brass, and can be integrally formed by forging or the like. However, the ball stud 30 is formed separately from the conductive relay member, and its neck is formed. You may couple | bond with the upper end of a conductive relay member by welding, adhesion | attachment, etc.

When the conductive relay member is formed of a cylindrical member obtained by rolling a thin metal plate into a cylindrical shape, a gap 33 in the longitudinal direction generated when the thin metal plate is rolled is formed as a slit 33 as shown in FIG. , By inflating the end of the cylindrical member, the ball portion 31,
A neck 32 is formed. Thus, when the ball portion 31 is inserted into the concave spherical surface of the concave spherical socket as described later, the slit 33 narrows, and when the ball portion 31 enters the concave spherical surface, the slit elastically recovers and expands. It is preferable that the ball portion is easily inserted into the concave spherical surface, and that the ball portion elastically reliably contacts the inner surface of the concave spherical surface.

At the lower end of the high voltage terminal 17, there is provided a concave socket 40 for receiving the ball portion 31 of the ball stud so as to swing. This concave spherical socket has a concave spherical surface 41 larger than the same hemisphere as the ball part, for accommodating the ball part 31 therein.

In order to make it easy to insert the ball into the concave spherical surface,
A plurality of slits in the latitude direction may be formed on the wall surrounding the concave spherical surface. In addition, in order to allow the concave spherical surface to easily spread when the ball portion is inserted, and to allow the ball portion to be swung by receiving the ball portion, a concave spherical socket 40 is provided.
Is preferably provided so as to protrude downward from the lower end of the insulating tubular portion 16.

When the upper fitting portion 22 of the flexible insulating member 21 of the relay device 20 is elastically fitted to the outside of the insulating cylindrical portion 16 of the ignition coil, the ball stud provided on the upper end of the conductive relay member 25 is provided. 30 balls are connected to the high voltage terminal 1 of the ignition coil.
7 is pushed into the concave ball socket 40 at the lower end, the relay and the high voltage terminal are swingably connected by the ball stud and the concave ball socket, and the upper end of the conductive relay member and the high voltage terminal are electrically connected. Then, the lower fitting portion 2 of the relay device 20
3 is elastically fitted to the outside of the top electrode 5 of the ignition plug in the plug hole 2 while the ignition coil is fixed to the cylinder block as described in paragraph 0007, and the lower end of the conductive relay member 25 of the relay device is connected. Is electrically connected to the top electrode 5 of the spark plug.

Since the high voltage terminal 17 of the ignition coil and the upper end of the conductive relay member of the relay are swingably connected by the ball stud 30 and the concave ball socket 40, when the ignition coil is fixed to the engine, , Even if the position of the ignition coil and the ignition plug in the plug hole are slightly shifted,
In addition to being able to absorb positional deviations, the engine is also bent at an angle corresponding to the conductive relay member of the relay device in advance for an engine whose plug hole 2 has an angle θ with respect to the mounting surface 10 ′ of the ignition coil as shown in FIG. Since there is no need, there is no need to previously transform the conductive relay member and the insulating member into parts that are deformed according to the angle of the plug hole, so that the parts structure is simplified, and the work of assembling the ignition coil is facilitated. Furthermore, since the concave ball socket of the high voltage terminal and the ball stud at the upper end of the conductive relay member of the relay are connected, if the lower end of the conductive relay member is securely in contact with the top electrode of the ignition plug, The conductive relay member of the relay device does not resonate due to the vibration of the engine. Therefore, the phenomenon that the spark plug does not generate spark discharge at the ignition timing of each cylinder and the air-fuel mixture in the cylinder cannot be ignited does not occur.

In the first embodiment of FIG. 1, the high-voltage terminal of the ignition coil is provided with a concave ball socket and the ball stud is provided at the upper end of the conductive relay member of the relay. It is also effective to provide a ball stud at the upper end at the lower end of the high voltage terminal of the ignition coil.

In the second embodiment of FIG. 4, a concave ball socket 40 is provided at the lower end of the conductive relay member of the relay, and a bulged portion normally provided at the upper end of the top electrode 5 of the spark plug is provided. Is used as the ball portion 31 of the ball stud 30, and the concave ball socket is fitted into this.

When the lower fitting portion 23 of the flexible insulating member 21 of the relay device 20 is elastically fitted to the outside of the top electrode 5 of the ignition plug, the concave ball socket 40 provided at the lower end of the conductive relay member 25 The concave spherical surface is pressed over the swollen portion (ball portion 31) provided at the upper end of the top electrode of the spark plug in the plug hole, whereby the relay and the spark plug are swingably connected, and The top electrode and the lower end of the conductive relay member of the relay are electrically connected. And relay device 2
As described in paragraph 0007, the ignition coil is fixed to the cylinder block while elastically fitting the upper fitting portion 22 of the ignition coil to the outside of the insulating tubular portion 16 of the ignition coil. Is electrically connected to the high voltage terminal 17 in the insulating cylinder of the ignition coil.

Since the top electrode 5 of the spark plug and the lower end of the conductive relay member of the relay are swingably connected, the same operation and effect as those of the first aspect described in paragraph 0015 can be obtained.

Further, as shown in FIG. 4, in addition to connecting the lower end of the conductive relay member and the top electrode of the ignition plug in the plug hole with the ball stud 30 and the concave socket 40, the head can be swung. The high-voltage terminal of the ignition coil and the upper end of the conductive relay member of the relay may also be swingably connected by the ball stud 30 and the concave socket 40, so that the high-voltage terminal is axially disposed in the insulating member of the relay. Since the upper and lower ends of the conductive relay member are fixed and cannot be moved in the axial direction, resonance caused by vibration of the engine can be reliably prevented.

In the illustrated embodiment, the ignition coil traverses over the plug hole, and the iron core is fixed to the cylinder block with bolts on the left and right mounting columns. However, the present invention is not limited to this. The fixing of the ignition coil to the engine, such as fixing inside or outside the rocker cover of the engine provided above, is optional.

[0022]

As is apparent from the above description, in claim 1, the high-voltage terminal 17 of the ignition coil and the upper end of the conductive relay member of the relay device, and in claim 2, the top electrode 5 of the ignition plug in the plug hole and the relay device Since the lower ends of the conductive relay members are connected by a ball stud 30 and a concave socket 40 so as to be able to swing and are electrically connected, when the ignition coil is fixed to the engine, the ignition coil, Even if the position of the spark plug in the plug hole is slightly displaced, it is possible to absorb the deviation of the position, and, as shown in FIG. 3, for an engine in which the plug hole 2 has an angle θ with respect to the mounting surface 10 ′ of the ignition coil. Also, it is not necessary to bend in advance to an angle corresponding to the conductive relay member of the relay device, and the component structure can be simplified because it is not necessary to form a complicated shape having the angle θ as described in paragraph 0015. Therefore, the assembly work of the ignition coil is easy. Furthermore, since the concave ball socket of the high voltage terminal and the ball stud at the upper end of the conductive relay member of the relay are connected, if the lower end of the conductive relay member is securely in contact with the top electrode of the ignition plug, The conductive relay member of the relay device does not resonate due to the vibration of the engine. Therefore, the phenomenon that the spark plug does not generate spark discharge at the ignition timing of each cylinder and the air-fuel mixture in the cylinder cannot be ignited does not occur.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a connection device in which main parts according to claim 1 of the present invention are enlarged, and FIG. 1B is a perspective view showing a state in which the ignition coil is fixed on a cylinder block.

FIG. 2 is an enlarged perspective view of a ball stud formed by a conductive relay member of the relay device.

FIG. 3 is a sectional view showing a connection state between an ignition plug and an ignition coil in a plug hole oblique to a mounting surface of the ignition coil.

FIG. 4 is a cross-sectional view of the connecting device according to claim 2 of the present invention, showing a main part on an enlarged scale;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Plug hole 3 Mounting column of ignition coil 4 Spark plug 5 Top electrode of ignition plug 6 Bolt for fixing ignition coil 10 Ignition coil 11 Primary coil of ignition coil 12 Secondary coil of ignition coil 13 Iron core 13 'Iron core 14 Insulating case 14a Both side walls of insulating case 15 Insulating layer 16 Insulating cylinder 17 High voltage terminal 20 Relay 21 Relay insulating member 22 Insulating member upper fitting portion 23 Insulating member lower fitting Portion 24 Relay tube of insulating member 25 Conductive relay member of relay device 30 Ball stud 31 Ball portion of ball stud 32 Neck portion of ball stud 33 Slit of ball portion 40 Concave ball socket 41 Concave spherical surface

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H01F 31/00 501K

Claims (2)

[Claims] 1. An inner periphery of a primary coil, a secondary coil concentrically fitted to the primary coil, and an iron core magnetically coupling the two coils to the primary coil and the secondary coil. A penetrated portion or the whole of the iron core is housed, and a thermosetting insulating resin is cast and filled in the inside, and a bottomed insulating case is provided. From the bottom of the case, a secondary coil is electrically connected. An ignition coil for an internal combustion engine with a protruding insulating cylinder portion holding the high-voltage terminal is placed with the insulating cylinder portion facing down and across the blind hole-shaped plug hole of the cylinder block of the engine with the ignition plug attached to the bottom. The upper portion is fixedly inserted into the plug hole so that the insulating cylinder portion protrudes into the plug hole, and the upper fitting portion is fitted to the insulating cylinder portion of the ignition coil; the lower fitting portion is fitted to the top electrode of the ignition plug; A hollow tube consisting of a relay tube connecting the two fittings An upper end portion of the conductive relay member is a high-voltage terminal of an ignition coil, and a lower end portion is a top electrode of an ignition plug, of a relay device comprising a flexible insulating member and a conductive relay member disposed axially in the insulating member. A connection device for connecting the ignition coil for the internal combustion engine and the ignition plug of the engine electrically connected to each other, wherein one of the high-voltage terminal of the ignition coil and the upper end of the conductive relay member facing the high-voltage terminal is provided with a ball. A stud, the other side of which is provided with a concave ball socket for receiving the ball portion of the ball stud so as to be able to swing, the ball portion of the ball stud is fitted into the inside of the concave ball socket, and the high voltage terminal and the conductive relay member are swingably connected. A connection device for connecting an ignition coil for an internal combustion engine to a spark plug of the engine. 2. The inner circumference of the primary coil, the secondary coil concentrically fitted to the primary coil, and the inner circumference of the primary coil and the secondary coil of the iron core magnetically coupling the two coils. A penetrating portion or the entire iron core is accommodated, and a thermosetting insulating resin is cast and filled in the inside, and a bottomed insulating case is provided. From the bottom of the case, a high voltage electrically connected to a secondary coil is provided. An internal combustion engine ignition coil with a protruding insulating cylinder holding the terminal is fixed with the insulating cylinder facing downward and across the blind hole-shaped plug hole of the engine cylinder block with the ignition plug attached to the bottom. And an upper fitting portion fitted to the insulating tubular portion of the ignition coil, and a lower fitting portion fitted to the top electrode of the ignition plug. Hollow flexible made up of a relay cylinder part connecting the fitting parts Of the conductive relay member, the upper end of the conductive relay member being the high voltage terminal of the ignition coil, and the lower end being the top electrode of the ignition plug. In a connection device for an ignition coil for an internal combustion engine and an ignition plug of an engine, which are electrically connected to each other, a concave portion for receiving the top electrode of the ignition plug in a swingable manner at a lower end portion of the conductive relay member facing the top electrode of the ignition plug. An ignition for an internal combustion engine, wherein a spherical socket is provided, a top electrode of the spark plug is fitted into the concave spherical socket, and a lower end of the conductive relay member and a top electrode of the spark plug are swingably connected. Connection device for coil and engine spark plug.