JPH0666207B2 - Internal combustion engine ignition coil - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a resin mold closed magnetic circuit ignition coil for an internal combustion engine mounted on a vehicle, and particularly to improvement of its productivity.

[Prior Art] Conventionally, an ignition coil 100 of an internal combustion engine is wound around a resin-made primary bobbin 111 on the outer periphery of two sets of closed magnetic circuit forming laminated cores (not shown), as shown in FIG. Dressed 1
A primary coil 110 composed of a secondary winding is arranged. Part 2
The terminal wire 112 of one primary coil 110 is wound around the protrusion 113 once and then wound around the terminal 121 of the connector 120 to be electrically connected to the connector 120. A secondary coil (not shown) having a high voltage terminal (not shown) projecting from the end surface of the secondary bobbin around which the secondary winding is wound in the direction of the connector 120 is provided on the outer circumference of the two primary coils 110. It is arranged respectively.
Further, the ignition coil 100 stores these two sets of the primary coil 110 and the secondary coil in a housing (not shown),
It is integrally molded with an electrically insulating thermosetting resin.

[Problems to be Solved by the Invention] However, in the ignition coil 100 configured as described above, the terminal wire 112 and the connector 120 on both sides of the primary winding of the primary coil 110 are connected.
In order to prevent excessive tension from being applied to the terminal wire 112 when connecting the plurality of terminals 121, the terminal wire 112 has a length, that is, the terminal wire 112 is loosened, The connector 121 is connected to the terminal 121.

Therefore, when the primary coil 110 and the secondary coil are housed in the housing, the terminal wires 112 on both sides of the primary winding may come into contact with or come close to the high voltage terminals of the secondary coil. There has been a problem that a sufficient insulation distance cannot be secured between the terminal wire 112 on both sides of the primary winding and the high voltage terminal of the secondary coil, and dielectric breakdown occurs.

Therefore, in order to eliminate the above-mentioned inconvenience,
An umbrella 114 (indicated by a broken line in FIG. 14) may be provided on the primary bobbin 111 to secure a sufficient insulation distance between the terminal wire 112 on both sides of the secondary winding and the high voltage terminal of the secondary coil. In order to insulate the terminal wire 112 on both sides of the primary winding from the high voltage terminal of the secondary coil, a method of covering the terminal wire 112 of the primary winding with an insulating tube 115 is adopted.

However, this causes a problem that the number of parts increases and that a large number of assembling steps are required for connection between the terminal wires 112 on both sides of the primary winding and the plurality of terminals 121 of the connector 120. It was

INDUSTRIAL APPLICABILITY According to the present invention, the connection between the terminal wires on both sides of the primary winding and the terminal on the connector side is simple, and there is sufficient space between the terminal wires on both sides of the primary winding of the primary coil and the high voltage terminal of the secondary coil. An object of the present invention is to provide an ignition coil for an internal combustion engine capable of ensuring an insulation distance.

[Means for Solving Problems] An ignition coil for an internal combustion engine according to the present invention includes a resin-made primary bobbin formed outside a core forming a magnetic path, and
A primary coil having a primary winding wound around the outer periphery of the next bobbin and having terminal wires on both sides drawn to one end of the primary bobbin; and a primary coil separate from the primary bobbin. 1
A resin-made secondary bobbin formed on the outside of the secondary winding.
A secondary winding wound around the outer circumference of the secondary bobbin, and a high-voltage terminal that is provided on the end face of the secondary bobbin on the lead-out side of the terminal wire of the primary winding and draws the terminal wire of the secondary winding to the outside. And a connector having a connector side terminal that is configured separately from the primary bobbin and the secondary bobbin and that electrically connects terminal wires on both sides of the primary winding to the outside. An ignition coil for an internal combustion engine, wherein the primary coil and the secondary coil are housed in a container-shaped housing, and a gap between these is filled with an insulating material. There is a bobbin-side terminal that fixes the terminal wires on both sides and is fitted into the connector-side terminal, and the bobbin-side terminal is separated from the high-voltage terminal of the secondary bobbin by a predetermined insulation distance. It is fixed to the null holder.

[Operation] With the above configuration, the ignition coil of the internal combustion engine of the present invention has the following operation.

According to the present invention, when electrically connecting the terminal wires on both sides of the primary winding of the primary coil and the connector side terminals of the connector, first connect the terminal wires on both sides of the primary winding to the primary bobbin. It is connected to the bobbin side terminal fixed to the terminal holding part which is separated from the high voltage terminal of the secondary coil by a predetermined insulation distance.

Then, by fitting the bobbin side terminals to which the terminal wires on both sides of the primary winding are connected to the connector side terminals of the connector, the terminal wires on both sides of the primary winding and the connector side terminals can be easily connected. At the same time, the position of the primary coil is determined with respect to the connector.

Also, since the length of the terminal wire on both sides of the primary winding is determined when connecting to the bobbin side terminal and connecting to the connector side terminal, there is not enough margin in the length of the terminal wire on both sides of the primary winding. Without this, the primary coil and the secondary coil can be easily assembled, and the primary coil and the secondary coil can be easily housed in the housing.

[Advantages of the Invention] According to the present invention, by only electrically connecting the terminal wires on both sides of the primary winding to the bobbin side terminals, it is possible to connect the terminal wires to the outer circumference of the primary coil later.
Even when the secondary coil is assembled, a predetermined insulation distance can be secured between the terminal wires on both sides of the primary winding and the high voltage terminal of the secondary coil. Thus, when the primary coil and the secondary coil are housed in the housing, it is possible to prevent the terminal wires on both sides of the primary winding and the high voltage terminals of the secondary coil from coming into contact with or approaching each other.

Further, by connecting the terminal wires on both sides of the primary winding to the bobbin side terminals and fitting the bobbin side terminals to the connector side terminals of the connector, the terminal wires on both sides of the primary winding and the connector are connected. The electrical connection can be made easily and surely. As a result, the number of parts can be reduced, and the number of assembling steps can be significantly reduced.

[Embodiment] An ignition coil of an internal combustion engine of the present invention will be described based on an embodiment shown in FIGS. 1 to 13.

1 to 8 show a first embodiment of the present invention. First
1 and 2 show a closed magnetic circuit ignition coil of a vehicle engine to which the present invention is applied.

1 shows a resin-molded closed magnetic circuit ignition coil for a four-cylinder engine for a vehicle to which an embodiment of the present invention is applied.

A resin mold closed magnetic circuit ignition coil (hereinafter abbreviated as ignition coil) 1 of the present embodiment includes a core 11 forming a magnetic path, a primary coil 2 arranged on the outer periphery of the core 11, and a connector 6 for the primary coil 2. , And a secondary coil 9 arranged on the outer periphery of the primary coil 2.

The ignition coil 1 is a housing 14 made of a container-shaped thermoplastic resin.
The primary coil 2 and the secondary coil 9 are put inside, and the gap between them is filled to ensure insulation between the primary coil 2 and the secondary coil 9. After being filled with a curable resin, it is heat-cured and molded. Further, since the ignition coil 1 of this embodiment is applied to a four-cylinder engine for a vehicle, two sets of a primary coil 2 and a secondary coil 9 are used.

The core 11 forming the magnetic path is a substantially C-shaped first laminated core.
12, a second I-shaped laminated core 13 facing the first laminated core 12 with a small gap. First laminated core 12
A large number of silicon steel plates are laminated and embedded in the housing 14 by molding. The second laminated core 13 is formed by laminating a large number of silicon steel sheets, and is housed in a housing 14 so as to form a magnetic circuit having a closed magnetic circuit together with the first laminated core 12.

A concave notch 16 is formed in a part of the side wall 15 of the housing 14.

The primary coil 2 is, as shown in FIGS. 3 to 6,
Rectangular tubular primary bobbins 3, 1 made of electrically insulating thermoplastic resin
Secondary winding 4, and bobbin side terminal 5 of the primary winding 4
Equipped with.

The primary bobbin 3 is tightly fitted onto the second laminated core 13 or integrally molded, and the primary winding 4 is wound around the primary bobbin 3. The flange portion 31 is formed on one side and the other side is formed. The collar-shaped portion 32 is formed. Further, on the upper part of the collar-shaped portion 31, a terminal holding portion 34 extending so as to be oriented in the direction of the connector 6 is formed. Substantially L-shaped grooves 35 and 36 are formed on both side surfaces of the terminal holding portion 34.

The primary winding 4 is wound around the primary bobbin 3 and the + side terminal wire 41
The terminal end 42 and the terminal end 44 of the one-side terminal wire 43 are fixed to the bobbin side terminal 5.

The bobbin side terminal 5 is provided with a collar-shaped portion 31 of the primary bobbin 3 which is separated from a high voltage terminal of a secondary coil 9 described later by a predetermined insulation distance.
The positive side terminal 51 and the one side terminal 52, which are made of metal, are fixed to the terminal holding portion 34.

The + side terminal 51 is the end of the + side terminal wire 41 of the primary winding 4.
42 is fixed and the terminal holding part of the primary bobbin 3
It is held in the groove 35 of 34 and forms a fitting portion 53 having a U-shaped cross section. The attachment point of the terminal end 42 of the + side terminal wire 41 of the + side terminal 51 is bent into a U shape by caulking or the like so as to wrap around the terminal end 42 of the + side terminal wire 41 of the primary winding 4. The terminating end 42 of the + side terminal wire 41 and the + side terminal 51 are securely connected by caulking, soldering, welding, welding or the like.

The one-side terminal 52 has a symmetrical structure with the + -side terminal 51, and has a fitting portion 54 having a U-shaped cross section. The one side terminal 52 is provided with the groove 36 of the terminal holding portion 34 of the primary bobbin 3.
Held in. These fitting portions 53, 54 are C-shaped,
Various structures such as a cylinder can be changed.

As shown in FIGS. 7 and 8, the connector 6 has a rectangular connector shell 62 made of a thermoplastic resin having excellent elec- trical insulation, in which an elliptical hole 61 opening toward the outside is formed.
The connector shell 62 has a terminal mounting portion 64 formed integrally with the coil side portion 63, a contact 7, and a connector side terminal 8.

The deepest part of the elliptical hole 61 is a contact board 65 on which the contacts 7 that electrically connect to each other when connected are projected. The connector shell 62 is an outer shell for positioning and fixing the fitting of a cord for drawing the primary winding 4 to the outside with a connector (not shown). The connector shell 62 is provided with a concave groove 67 in which a synthetic resin sealing member 66 fitted in the notch 16 in the side wall 15 of the housing 14 is mounted.
The terminal mounting part 64 is a coil side part of the connector shell 62.
Extending portions 68 and 69 extending a predetermined distance from both sides of 63 are provided. On the extending portions 68 and 69, connector-side terminals 8 are formed so as to project toward the primary bobbin 3.

The contacts 7 are arranged on both sides of the + side contact 71 made of metal for drawing the + side terminal wire 41 of the primary winding 4 to the outside, and the + side contact 71, and the one side terminal wire 43 of the primary winding 4 is provided. Has one side contacts 72, 73 made of metal for pulling out the.

The connector side terminal 8 is a + side terminal fitted to the fitting portion 53 of the bobbin side terminal 5 of the two primary coils 2.
81, 82 and bobbin side terminal 5 of two primary coils 2
And one side terminals 83 and 84 of the connector side terminal 8 which are fitted to the fitting portion 54 of FIG.

In the connector 6, the contact 7 and the connector-side terminal 8 are assembled in advance, these are put in the mold of the connector shell 62, and a thermoplastic resin having excellent electrical insulation is poured into the mold to make the connector shell 62 It is provided integrally with.
Alternatively, the connector 6 is configured such that the contact 7 and the connector side terminal 8 are fitted into the connector shell 62 after resin molding and provided integrally with the connector shell 62.

The secondary coil 9 is a substantially cylindrical secondary bobbin 91 made of an electrically insulating resin, which is externally fitted to the primary coil 2, a secondary winding 92 wound around the outer periphery of the secondary bobbin 91, and the secondary winding 92. The high voltage terminal 94 is provided to draw the terminal wire 93 of the secondary winding 92 to the outside. High voltage terminal 94
Is provided on a projecting portion 95 extending from both upper ends of both ends of the secondary bobbin 91 so as to project in both directions, and is connected to a power supply line (not shown) to an ignition plug (not shown). . The protrusion 95 has a high-voltage tower 96 that holds the power supply line.
Is installed.

A method of assembling the primary coil of the ignition coil 1 of this embodiment will be described with reference to the drawings.

In the primary bobbin 3 of the primary coil 2, the + side terminal 51 and the-side terminal 52 of the bobbin side terminal 5 are fixedly secured to the grooves 35 and 36 formed in the terminal holding portion 34 of the primary coil 2. As a fixing method, the + side terminal 51 and the-side terminal 52 are integrally formed with the second laminated core 13 when the primary bobbin 3 is molded. Alternatively, the + side terminal 51 and the-side terminal 52 are fixed to the primary bobbin 3 by press fitting or fitting into the grooves 35 and 36 formed in the terminal holding portion 34 of the primary bobbin 3 after molding.

After winding the primary winding 4 around the primary bobbin 3, the + side terminal wire 41 of the primary winding 4 is attached to the U-shaped type mounting portion of the + side terminal 51 and the-side terminal 52 of the primary bobbin 3. Of the + side terminal 51 and the terminal 44 of the + side terminal wire 43 and the terminal 44 of the + side terminal wire 43 and the terminal 44 of the + side terminal wire 43 and The side terminal 51 and the-side terminal 52 are fixedly attached. Furthermore, soldering, welding, etc. are performed at this mounting point.

As shown in FIGS. 4 to 6, two primary coils 2
The terminal wire of the primary coil 4 is obtained by fitting the bobbin side terminal 5 of
The required wiring between 41 and 43 and the connector 6 is completed.

That is, the fitting portion 53 of the bobbin side terminal 5 of the two primary coils 2 and the + side terminal 8 of the connector side terminal 8
1 and 82 are fitted together, the fitting parts 54 of the bobbin side terminal 5 of the two primary coils 2 and the minus side terminals 83 and 84 of the connector side terminal 8 are fitted together, and these fitting points are In addition to caulking, soldering, welding, etc. are used to ensure reliable electrical connection, which facilitates electrical connection between the bobbin-side terminals 5 of the two primary coils 2 and the connector 6 for assembly. This will greatly reduce the number of steps.

On the other hand, the bobbin-side terminal 5 is fixed to the terminal holding portion 34 of the collar-shaped portion 31 of the primary bobbin 3, which ensures a predetermined insulation distance from the high voltage terminal 94 of the secondary coil 9. Therefore, after connecting the terminal wires 41 and 43 of the primary winding 4 and the connector 6 to each other, the secondary coil 9 is arranged on the outer periphery of the primary coil 2 and when the secondary coil 9 is housed in the housing 14, It is possible to prevent the terminal wires 41 and 43 of the wire 4 from accidentally coming into contact with or approaching the high voltage terminal 94 of the secondary coil 9.

Further, since the bobbin side terminal 5 and the connector side terminal 8 of the connector 6 are electrically connected by fitting, the primary bobbin 3 and the connector 6 can be easily positioned, and the bobbin side terminal 5 and the connector 6 can be easily positioned. 6 and the connector-side terminal 8 can be securely fixed.

9 to 13 show a second embodiment of the present invention.

(Functions having the same functions as those in the first embodiment are designated by the same reference numerals) In the ignition coil 1 of this embodiment, three sets of a primary coil 2 and a secondary coil 9 are used for application to a 6-cylinder engine for a vehicle.

The contact 7 of the connector 6 of this embodiment is a metal + side contact 7 for drawing out the + side terminal wire 41 of the primary winding 4 to the outside.
1 and the minus side contacts 72, 73, 74 made of metal for drawing out the minus side terminal wire 43 of the primary winding 4 to the outside.

Further, the connector side terminal 8 of this embodiment includes + side terminals 81, 82 and 85 which are fitted to the fitting portions 53 of the bobbin side terminals 5 of the three primary coils 2 and the bobbin side of the three primary coils 2. The negative terminal 83, 84, 86 of the connector-side terminal 8 fitted to the fitting portion 54 of the terminal 5 is provided.

As described above, according to the present invention, the connection between the + side terminal wire 41 and the one side terminal wire 43 of the primary winding 4 of the primary coil 2 and the connector 6 or the positioning and fixing of the primary bobbin 3 and the connector 6 is performed. The more the number of primary coils 2 increases, the more advantageous it becomes compared with the conventional one.

[Modifications] a) In the present embodiment, the present invention is applied to the closed magnetic circuit ignition coil of the vehicle four-cylinder or six-cylinder engine, but may be applied to the closed magnetic circuit ignition coil of the vehicle single-cylinder engine. It may be applied to a closed magnetic circuit ignition coil of a vehicle engine having a plurality of cylinders as described above.

B) In the present embodiment, the present invention is applied to an ignition coil integrally molded with a thermosetting resin, but it may be applied to an oil-filled ignition coil or a pitch-filled ignition coil.

C) The present invention is not limited to the structures of the example coil and the secondary coil in this embodiment, and the structures can be modified without departing from the present invention.

D) The present invention is not limited to the structure of the connector of this embodiment, and the structure can be modified without departing from the present invention.

[Brief description of drawings]

FIG. 1 is an assembly diagram of a closed magnetic circuit ignition coil for a vehicle engine to which an ignition coil for an internal combustion engine according to a first embodiment of the present invention is applied,
FIG. 2 is a front view of the closed magnetic circuit ignition coil of the vehicle engine to which the first embodiment of the ignition coil of the internal combustion engine of the present invention is applied. FIG. 3 is a partial cross-sectional view showing a connection structure between a primary coil and a connector of a closed magnetic circuit ignition coil of a vehicle engine to which the first embodiment of the ignition coil of the internal combustion engine of the present invention is applied, and FIG. FIG. 5 is a front view showing the positional relationship between the primary coil and the connector of the closed magnetic circuit ignition coil of the vehicle engine to which the first embodiment of the ignition coil of the internal combustion engine is applied, FIG. 5 is a plan view of FIG. The figure is a side view of FIG. FIG. 7 is a perspective view showing a connector of a closed magnetic circuit ignition coil of a vehicle engine to which the first embodiment of the ignition coil of the internal combustion engine of the present invention is applied, and FIG. 8 is a first ignition coil of the internal combustion engine of the present invention. It is a wiring diagram of the connector of the closed magnetic circuit ignition coil of the vehicle engine to which the embodiment is applied. FIG. 9 is a front view of a closed magnetic circuit ignition coil for a vehicle engine to which a second embodiment of an ignition coil for an internal combustion engine of the present invention is applied,
10 is a front view showing the positional relationship between the primary coil and the connector of the closed magnetic circuit ignition coil of the vehicle engine to which the second embodiment of the ignition coil of the internal combustion engine of the present invention is applied, and FIG. 11 is FIG. FIG. 12 is a perspective view showing a connector of a closed magnetic circuit ignition coil of a vehicle engine to which the second embodiment of the ignition coil of the internal combustion engine of the present invention is applied, and FIG. 13 is ignition of the internal combustion engine of the present invention. It is a wiring diagram of the connector of the closed magnetic circuit ignition coil of the vehicle engine to which the second embodiment of the coil is applied. FIG. 14 is a side view showing a connection structure between a primary bobbin of a conventional closed-circuit magnetic ignition coil of a vehicle engine and a connector. In the figure, 1 ... Resin mold closed magnetic circuit ignition coil, 2 ... Primary coil,
3 ... Primary bobbin, 5 ... Bobbin side terminal, 6 ... Connector, 8 ... Connector side terminal, 9 ... Secondary coil, 11 ...
Core forming a magnetic path, 14 ... Housing, 15 ... Side wall, 41 ...
+ Side terminal line, 43… − side terminal line, 94… high voltage terminal

Claims (1)

[Claims] 1. A resin-made primary bobbin formed outside a core forming a magnetic path, and wound around the outer periphery of the primary bobbin, and terminal wires on both sides are drawn out to one end side of the primary bobbin. A primary coil having a primary winding, and a primary coil separate from the primary bobbin.
A resin-made secondary bobbin formed on the outside of the secondary winding.
A secondary winding wound around the outer circumference of the secondary bobbin, and a high-voltage terminal that is provided on the end face of the secondary bobbin on the lead-out side of the terminal wire of the primary winding and draws the terminal wire of the secondary winding to the outside. And a connector having a connector side terminal that is configured separately from the primary bobbin and the secondary bobbin and that electrically connects terminal wires on both sides of the primary winding to the outside. An ignition coil for an internal combustion engine, wherein the primary coil and the secondary coil are housed in a container-shaped housing, and a gap between these is filled with an insulating material. There is a bobbin-side terminal that fixes the terminal wires on both sides and is fitted into the connector-side terminal, and the bobbin-side terminal is separated from the high-voltage terminal of the secondary bobbin by a predetermined insulation distance. An ignition coil for an internal combustion engine, characterized in that fixed to the null holder.