JP2001006954A - Primary and secondary coil assembly of ignition coil for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect the secondary wire at the winding-stating end section of a secondary coil to the primary winding at the winding-ending end section of a primary coil without soldering. SOLUTION: A primary and secondary coil assembly is constituted in such a way that a supporting wall 25 which supports a conductive pin 22 by holding it with the wall 25 is provided, and a cut-out 31 is partially formed at the lower end of the wall 25 for partially exposing the horizontal portion 22' of the pin 22. Then the stopper flange 41 of a primary bobbin for a primary coil 40, which is made of an insulating material and stops the primary bobbin when the primary coil 40 is inserted into a secondary bobbin, is provided at the front end section of the primary bobbin, and a conductive piece 43 to which the winding-ending end section of the primary coil 40 is connected is attached to the flange 41. In addition, an engaging section 44 which engages the conductive piece 43 by getting into the slit section of the flange of the secondary bobbin on the winding-starting side when the primary coil 40 is inserted into the secondary bobbin is installed to the piece 43, and the winding-ending end section of the primary coil is electrically connected to the winding-starting end section of the secondary coil through the conductive pin 22 and piece 43 by inserting the primary coil 40 into the secondary bobbin for assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary and secondary coil incorporated in an internal combustion engine ignition coil for supplying a high voltage to an ignition plug of an internal combustion engine such as an automobile engine to generate a spark discharge. Related to an assembly.

[0002]

2. Description of the Related Art A primary coil and a secondary coil assembly of an ignition coil for an internal combustion engine are, for example, as shown in FIG. Then, the core is housed in an insulating case together with the core, and embedded and fixed in a cured layer of a thermosetting insulating resin poured into the insulating case. 5 is a closed magnetic circuit type core 50 including an outer ring core 51 and a center core 52 crossing the inside of the outer ring core. The outer ring core is a C-shaped core 53 and a C-shaped core 53 in the figure. The primary and secondary coil assemblies are fitted and supported on the outer periphery of the center iron core 52. The I-shaped iron core 54 connects the open ends of the iron core. A permanent magnet piece 55 is arranged in series with the closed magnetic path between one end of the center core and the inner periphery of the outer ring core to apply a magnetic bias to the core and to cut off the current when the current to the primary coil is cut off. Increase the amount of change in the magnetic flux of the body,
The output of the ignition coil is increased. The primary and secondary coil assemblies according to the present invention can be used for iron cores other than those shown in FIG.

As shown in FIG. 4, a conventional secondary coil 10 basically includes a hollow cylindrical portion 11 which penetrates a primary coil through an inner periphery thereof and which is concentrically supported, and a front end portion of the hollow cylindrical portion 11. A secondary bobbin 10 ′ made of an insulating material, for example, synthetic resin, integrally provided with a winding start side flange 12 provided at the rear end and a winding end side flange 13 provided at the rear end portion, and the hollow cylindrical portion. A secondary wire 14 is spirally and densely wound around the outer periphery from the flange 12 on the winding start side to the flange 13 on the winding end side. In the figure, a divided winding bobbin having a plurality of intermediate flanges 15 is shown on the outer periphery of the hollow cylindrical portion 11 between the winding start side flange 12 and the winding end side flange 13, and the intermediate flange is located at one of the central positions. Alternatively, the outer shape of the two flanges 15 ′ is maximum, and the outer shape gradually decreases toward the minimum winding outer side and each winding end side flange, and from the winding initial side flange toward the winding end side flange. The spirally wound secondary electric wire winds a plurality of winding portions between front and rear adjacent flanges in order from the winding start side to the winding end side.

A U-shaped pocket 17 having an upper surface opened by a wall 16 is formed on the upper front surface of the flange 12 on the winding start side. Inside the pocket 17, a U-shaped conductive pin made of a tin-plated copper wire is formed. 18 is inserted and fixed, both upward portions 18a, 18b of the U-shaped conductive pin are projected upward from the open surface of the pocket, and one end of the secondary wire 14 at the beginning of winding is wound around one upward portion 18a. And the other upward portion 18b has 1
The end of the primary wire of the secondary coil, the external input terminal of the ignition coil, or the lead wire 19 connected to the power switch if the ignition coil has a built-in power switch.
Was wrapped around and soldered each.

[0005]

The secondary bobbin is set on a winding machine, and the winding machine is operated to move the outer periphery of the hollow cylindrical portion 11 from the rear surface of the flange on the winding start side to the front surface of the flange on the winding end side. Towards 2
When the secondary wire is spirally and densely wound, the secondary wire is drawn in advance from the nozzle of the winding machine, and the upward portion 18 of the U-shaped conductive pin is drawn.
The winding end of the secondary wire is wound around a, and after soldering, the winding machine is operated to perform winding. Then, when the winding operation by the winding machine is completed, the secondary electric wire protruding from the nozzle of the winding machine is cut, and the secondary bobbin is removed from the winding machine to remove U.
The end of the primary wire of the primary coil on the winding end side, the external input terminal of the ignition coil, or the lead wire to be connected to the power switch must be wrapped around and soldered to the other upward portion 18b of the conductive pin. It takes time and trouble to work. Then, the primary coil is inserted from the front end into the inner periphery of the secondary bobbin, the primary coil is passed through the bobbin of the secondary coil and assembled, and the end of the secondary wire on the winding end side is connected to a high voltage terminal (not shown). .

[0006]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems.
Next, the secondary coil assembly has a winding end side flange at the front end and a winding end side flange at the rear end, and has a secondary winding extending from the winding start side flange toward the winding end side. In the inner circumference of the hollow cylindrical portion of the secondary bobbin made of an insulating material of the secondary coil around which the electric wire is wound,
In a primary and secondary coil assembly of an internal combustion engine ignition coil in which a secondary coil is inserted and assembled concentrically, an end of a secondary wire at a winding start side is provided on a front surface of a winding end side flange of the secondary bobbin. A support wall for pinching and supporting a conductive pin having an upward portion to be connected is provided on a front surface of the flange, and a cutout portion is formed at a part of a lower end of the support wall to expose a part of the horizontal part of the conductive pin. When the primary coil is inserted into the secondary bobbin, the stopper flange which abuts on the front surface of the flange on the winding start side of the secondary bobbin is set to 1
A conductive piece is provided at the front end of the primary bobbin made of an insulating material for the secondary coil, and a conductive piece for connecting the end of the primary coil on the winding end side is attached to the stopper flange. When the secondary coil is inserted into the secondary bobbin, a biting portion is provided to protrude into the slit at the flange on the winding start side of the secondary coil and bite the lateral portion of the conductive pin. The end of the primary coil at the end of winding and the end of the secondary coil at the beginning of winding are electrically connected to each other through the conductive pin and a conductive piece by being inserted into a bobbin and assembled. And In addition, a pair of opposing elastic claws protruding rearward from both sides of the inner circumference are provided on the rear surface of the flange at the winding end side of the secondary bobbin of the primary and secondary coil assemblies according to the first aspect. When the primary coil is inserted into the secondary bobbin and penetrated, and the stopper flange comes into contact with the flange on the winding start side of the secondary coil,
It is preferable to provide an engagement portion that engages with the elastic claw piece at a rear end of the primary bobbin that protrudes outward from a flange on the winding end side of the secondary bobbin.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show an embodiment of the present invention. Components equivalent to those in FIG.

In the embodiment of the present invention shown in FIGS.
In addition to providing a notch 21 extending from the outer periphery of the flange to the outer periphery of the hollow cylindrical portion 11 in the flange 12 on the winding start side of the secondary bobbin, the notch 21 is shielded from the front on the front surface of the flange 12, An L-shaped conductive pin 22 made of a tin-plated copper wire provided with an upward portion around which the beginning end of the secondary wire is wound is integrally provided with a shielding support wall 24 for supporting the upward portion 23 upward. It is. The reason why the notch 21 is provided in the flange 12 on the winding start side is not directly related to the present invention, but is attached to the upward portion of the L-shaped conductive pin and located above the front surface of the flange as described later. A portion (crossover portion 14 ′) extending rearward from the end on the winding start side of the next electric wire passes through the notch 21 without straddling the outside of the flange 21, and is guided to the rear side of the flange 21. This is because a secondary coil is formed by densely spirally winding the outer periphery of the hollow cylindrical portion 11 from the rear surface.

The shielding support wall 24 is slightly away from the front surface of the flange on the winding start side, and the conductive pin 22 is located between the front surface and the front surface.
A support wall 25 for sandwiching the notch with elasticity of a synthetic resin;
The lower wall is joined to the front surface of the collar 12 at the beginning of the winding, so that the lower wall stands up in front of the notch and covers the notch 21 from the front. The height is almost the same as the upper end of the flange 12 on the winding start side.
The support wall 25 has an L-shaped section having a bottom 25 'and is joined to the front surface of the flange 12 on the winding start side by the bottom 25'.

[0010] Then, the winding end of the secondary wire attached to the upwardly directed portion 23 of the conductive pin is inserted into the notch 21 from the front of the winding flange 12 shown in Fig. 1C. The left end 25L of the support wall 25 and the right end 26R of the shielding wall 26, which are opposed to each other in a staggered manner in front of the end 21 'on the entrance side of the notch on the side, are connected in a crank shape by a connecting wall 27.

The other end 21 ″ of the notch, in which the crossover portion 14 ′ of the secondary electric wire 14 passes obliquely through the notch 21 and comes out of the notch to the rear side of the flange at the beginning of winding, is connected to the end 21. The end 12 'of the flange 12 forming the "" and the left end of the shielding wall 26 are closed by an upright wall 28 which is connected in a staggered manner. The rear surface of the upright wall 28 is flush with the rear surface of the flange 12 on the winding start side, the height is higher than the shielding wall 26, and the upper portion protrudes upward from the shielding wall.

The L-shaped conductive pin 22 is inserted between the support wall 25 and the front surface of the flange at the beginning of the winding, and its horizontal portion 22 'is laid on the bottom 25' of the support wall 25. 2
3 is set up along one end 21 ′ of the notch 21, and the upper end thereof is projected upward from the support wall. Then, the secondary bobbin 10 is attached to the winding machine and pulled out from the nozzle 20 of the winding machine 2. The end of the winding start side of the next electric wire 14 is connected to the upward portion 23 of the conductive L-shaped pin.
The bobbin 10 is rotated by operating the winding machine in the direction of the arrow in FIG. 1C, and the crossover portion 14 ′ of the secondary electric wire is passed through the notch 21 and wound. Tsuba 12 at the beginning
And a subsequent wire is spirally wound around the outer periphery of the hollow cylindrical portion between the front and rear adjacent flanges between the rear surface of the flange and the front surface of the flange 13 on the winding end for the required number of times. And a secondary coil.

At the beginning of the winding of the secondary wire by the winding machine,
The next electric wire is wound along the rear surface of the flange
It is necessary to wind the nozzle of the winding machine from the nozzle as shown in FIG. 1 (C).
The secondary wire 14 must be positioned exactly along the rear surface of the flange at the beginning of winding, but in the illustrated embodiment, the other end 21 ″ of the notch is provided by an upright wall 28 protruding above the shielding wall 26.
Therefore, the position of the nozzle 20 may be set to an arbitrary position b behind the position a. As a result, the secondary bobbin rotated by the winding machine in the direction of the arrow turns the nozzle 20 and the secondary electric wire 14 wrapped around the leading end 23 of the conductive pin in the first rotation. Is wound on the hollow cylindrical portion 11 along the rear surface of the flange 12 on the winding start side by being hooked on the upright wall 28. Therefore, there is no need to accurately set the nozzle 20 to the position a at the beginning of the operation of starting the winding operation by rotating the secondary bobbin with the winding machine, and the operation efficiency is greatly improved.

In the conventional example shown in FIG. 4, a U-shaped conductive pin is used, and the end of the secondary wire at the beginning of winding is wrapped around one of the upward portions 18a, and one end is wound on the other upward portion 18b. The end of the primary coil at the end of winding of the primary wire, the external input terminal of the ignition coil, or the lead wire 19 connected to the power switch when the ignition coil has a built-in power switch, are soldered, respectively. However, in the present invention, the L-shaped conductive pin 22 is used, and the leading end of the secondary wire is wound around the upward portion 23, so that the external input terminal and the power switch are not used. The connection is made by using the horizontal portion 22 'of the conductive pin.

For this reason, the support wall 25 of the shielding support wall provided on the front surface of the flange at the beginning of the winding includes a slit 31 including a bottom 25 '.
Is formed, and a part of the lateral portion 22 ′ of the L-shaped metal pin supported on the bottom 25 ′ is exposed from the slit 31.

Then, the collar 1 on the winding start side of the secondary bobbin 10
Primary coil 4 to be inserted from the front end having inner portion 2 to its inner periphery
0 is provided at the front end of the bobbin 40 'at the front end of the flange 12 on the winding start side.
1, an end of the primary coil on the winding end side of the primary wire is attached, and a conductive piece 43 connected to an external input terminal of the ignition coil or a power switch built in the ignition coil is fixed to this, as described later. A biting portion 44 is provided at one end of the conductive piece 43 so as to bite the horizontal portion 22 'of the conductive pin. Therefore, when the primary coil is inserted from the rear end to the inner periphery of the secondary bobbin, the stopper flange 41 has the biting portion 44 of the conductive piece on the front surface of the secondary bobbin winding start side flange. A holding portion for fixing the conductive piece is provided to face the notch portion of the support wall. In the illustrated embodiment, the biting portion 44 is provided at a short end of one end of the conductive piece 43 which is bent rearward at a right angle.

Accordingly, the conductive piece 44 is fixed to the holding portion 42 on the stopper flange 41 of the primary coil, and the end of the primary coil on the winding end side is attached, and the primary coil 40 is connected to the secondary bobbin 1.
1 when the stopper flange 41 abuts on the front surface of the flange 12 on the winding start side of the secondary bobbin (at this time, the small-diameter flange 48 at the rear end of the primary bobbin is Projecting from the rear surface of the collar 13 on the winding end side of
It penetrates the inner circumference of the next bobbin. ), Biting portion 4 of conductive piece 44
Reference numeral 5 protrudes into the notch 31 of the support wall 25 on the front surface of the flange 12 on the winding start side of the secondary bobbin, and bites the exposed portion of the laterally-facing portion 22 'of the L-shaped conductive pin.

By penetrating the primary coil through the inner periphery of the secondary bobbin in this way, the conductive pin 22 to which the winding end of the secondary wire is attached and the conductive piece to which the winding end wire of the primary coil is attached. 43 can be electrically connected, so that the primary electric wire on the winding end side of the primary coil is
The work of wrapping around and soldering to 8b becomes unnecessary. The other end of the conductive piece 43 is electrically connected to an external input terminal of the ignition coil, or to the power switch when the ignition coil has a built-in power switch, so that the upwardly directed portion 18b of the U-shaped conductive pin is connected. In addition, there is no need to wind and wire an external input terminal of the ignition coil or a lead wire for connecting to the power switch when the ignition coil has a built-in power switch.

In order to attach the primary electric wire on the winding end side of the primary coil to the conductive piece 43, the conductive piece 43 is provided with a T-shaped electric wire attaching portion 45. The electric wire attaching portion 45 includes a narrow neck 46 and a head 47 which is wider than the neck 46 and is provided on the neck. In order to set the primary bobbin 40 'in a winding machine and tightly spirally wind the primary wire into a primary coil, the primary wire is stoppered from the front end of the flange 48 at the rear end of the bobbin. Winding around the bobbin toward 41, when the number of windings is large, it is folded back from the stopper flange 41 toward the flange 48, and if necessary, it is folded again and wound over the stopper flange, and the required number of windings When finished, the primary wire is cut from the winding machine, and the cut end side of the cut wire is wrapped around the neck 46 of the wire mounting portion 45 and, if necessary, soldered. As a result, the end of the electric wire at the winding end side of the primary coil wrapped around the neck 46 is blocked by the head 47 provided on the neck 46 and does not come off the electric wire mounting portion 45.

The primary coil is inserted into the inner periphery of the secondary bobbin,
The biting portion 45 of the conductive piece 44 is the flange 1 on the winding start side of the secondary bobbin.
The conductive piece 44 approaches the front surface of the support wall 25 when it protrudes into the cut portion 31 of the support wall 25 on the front surface of the second and bites the exposed portion of the lateral portion 22 ′ of the L-shaped conductive pin. However, the end of the primary wire wrapped around the neck 46 of the wire attachment portion of the conductive piece 44 becomes thicker at the end of winding, and the end of the thickened primary wire before the conductive piece approaches. The end on the side contacts the front surface of the support wall 25, the conductive piece cannot approach the front surface of the support wall, and the biting portion 45 of the conductive piece cannot fully penetrate the cutout portion 31. Horizontal part 2
It is also conceivable that the exposed portion 2 'cannot be bitten. In order to prevent this, the support wall 2 of the secondary bobbin
5 has 1 wrapped around the neck of the wire attachment portion of the conductive piece.
Notch 32 at the position where the end on the winding end side of the next electric wire contacts
It is preferable that an end on the winding end side of the primary electric wire be accommodated in the notch.

In order to prevent the primary coil, which has been inserted and penetrated into the inner periphery of the secondary bobbin, from coming out in the direction opposite to the insertion direction (the primary coil is formed by a stopper flange 41 at the flange 12 on the winding start side of the secondary bobbin. Because it is in contact with the front surface of the secondary bobbin, it does not come out in the insertion direction.) On the rear surface of the collar 13 on the winding end side of the secondary bobbin, a pair of opposed elastic claws 33 projecting rearward from both sides of the inner circumference. 33 are provided. The space between the elastic claws 33, 33 narrows toward the rear. This pair of elastic claws 3
The rear ends of the 33 and 33 are engaged with both sides of the rear end flange 48 of the primary coil bobbin projecting outward from the inner periphery of the secondary coil.

Accordingly, the primary coil is inserted into the inner periphery of the bobbin of the secondary coil having the flange 12 at the beginning of the winding from the rear end having the flange 48, and as described above, the stopper flange at the front end of the primary coil is provided. Comes close to the collar 12, and the biting portion 4 of the conductive piece 43
4 are inserted into the notch 31 of the support wall and the L-shaped conductive pins 22
When biting the horizontal portion of the primary coil, the flange 48 at the rear end of the primary coil
Pushes and expands the pair of elastic claws 33, 33 protruding rearward from the inner periphery of the secondary bobbin, the stopper flange of the primary coil abuts against the support wall 25 on the front surface of the secondary bobbin flange, and the biting portion 44 When the lateral portion 22 'of the L-shaped conductive pin is bitten, the pair of elastic claws 33, 33 engages with the flange 48 at the rear end of the primary bobbin with a restoring force. As a result, the primary coil is blocked by the elastic claws 33, 33 and does not escape from the inner periphery of the secondary coil in the direction opposite to the insertion direction. It is not always necessary that the elastic claws 33, 33 engage with the collar 48, and the elastic claws 33, 33 pass through the inner periphery of the secondary bobbin and protrude outward from the rear end of the secondary bobbin.
An appropriate engaging portion provided at the rear end of the next bobbin may be used.

[0023]

According to the present invention, the primary coil is inserted and penetrated into the inner periphery of the secondary coil, and the conductive pin 22 to which the end on the winding start side of the secondary wire is attached by the original assembling work, and the winding end of the primary wire Since the conductive piece can be electrically connected to the conductive piece 43 to which the side end is attached, and the conductive piece can be connected to the external input terminal of the ignition coil or the power switch, so that the soldering operation is largely omitted. The productivity of the primary and secondary coil assembly is significantly improved. According to the second aspect, the primary coil is prevented from coming out of the inner periphery of the secondary coil in a direction opposite to the insertion direction.
Does not come off from the lateral portion 22 'of the L-shaped conductive pin, the electrical connection does not become defective, and the primary coil and the secondary coil are maintained in the assembled state, so that the subsequent operation of manufacturing the ignition coil is easy. .

[Brief description of the drawings]

FIG. 1 (a) shows a bobbin of secondary coil and L according to the present invention.
1B is an exploded perspective view of the conductive pin, FIG. 1B is a front view of the same, and a partially enlarged view thereof, FIG. 1C is a plan view of the same, and a partially enlarged view thereof, and FIG. FIG. 4 is an enlarged sectional view of a main part taken along line d-d of FIG.

2 (a) is an explanatory view of an assembling state of a primary coil and the secondary coil of FIG. 1, and FIG. 2 (b) is a plan view of the same assembling state.

FIG. 3 is an enlarged plan view of FIG.

4A is an exploded perspective view of a bobbin of a conventional secondary coil and a U-shaped conductive pin, FIG. 4B is a front view of the same, FIG. 4C is a plan view of the same, and FIG. 3 is an enlarged view of a part taken along line d-d of FIG.

FIG. 5 is an explanatory diagram showing an example of a relationship between a primary and secondary coil assembly of an ignition coil and an iron core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Secondary coil 10 'Secondary bobbin 11 Hollow cylindrical part of secondary bobbin 12 Flange at the beginning of winding of secondary bobbin 13 Flange at end of winding of secondary bobbin 14 Secondary electric wire 22 L-shaped conductive pin 23 L-shaped conductive Upward portion of pin 25 Support wall 25 'Bottom of support wall 31 Splitting portion of support wall 33 A pair of elastic claws 40 Primary coil 40' Primary bobbin 41 Stopper flange of primary bobbin 43 Conductive piece 44 Biting conductive piece Part 48 Flange or engaging part at the rear end of primary bobbin 50 Closed magnetic circuit core 51 Outer ring core of closed magnetic circuit core 52 Center core of closed magnetic circuit core 53 C-shaped core of outer ring core 54 Outside I-shaped iron core of ring iron core 55 Permanent magnet piece

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Meiji Shinnobu 2-1-26-1 Tsutodori, Nada-ku, Kobe City, Hyogo Prefecture Inside Hanshin Electric Co., Ltd. (72) Inventor Hiroshi Kimura Nada-ku, Kobe City, Hyogo Prefecture No. 2-26, Hanshin Electric Co., Ltd. F-term (reference) 3G019 KC03 KC04 5E043 AA02 AB01 EB01 EB03 EB06 5E044 BA03 BB02 BB08 BC01

Claims (2)

[Claims] 1. A winding at a front end portion having a winding start side flange and a rear end portion having a winding end side flange, and a secondary electric wire wound around the outer periphery from the winding start side flange to the winding end side flange. One of the ignition coils for an internal combustion engine which is assembled concentrically by inserting a primary coil into the inner periphery of a hollow cylindrical portion of a secondary bobbin made of an insulating material for the secondary coil.
Next, in the secondary coil assembly, a conductive pin having an upward portion for connecting the end of the secondary wire at the winding start side to the front surface of the winding end side flange of the secondary bobbin is pressed against the front surface of the flange. A support wall for supporting the support pin is provided, and a cutout portion is formed at a part of the lower end of the support wall to expose a part of the horizontal portion of the conductive pin, and when the primary coil is inserted into the secondary bobbin, A stopper flange is provided at the front end of the primary bobbin made of an insulating material for the primary coil, the stopper flange abutting on the front surface of the bobbin winding start side flange. A conductive piece is attached to the conductive pin, and when the primary coil is inserted into the secondary bobbin, the conductive piece protrudes into a notch at the flange on the winding start side of the secondary coil so that the conductive pin faces sideways. The primary coil is inserted into the secondary bobbin to assemble it. The winding end-side end of the primary coil and 2
A primary and secondary coil assembly for an internal combustion engine ignition coil, wherein an end of the next coil at the winding start side is electrically connected to the conductive pin via a conductive piece. 2. The primary and secondary coil assembly for an ignition coil for an internal combustion engine according to claim 1, wherein a relative projecting rearward from both sides of an inner circumference to a rear surface of a flange at a winding end side of the secondary bobbin. A pair of elastic claws facing each other, the primary coil is inserted into the secondary bobbin, and when the stopper flange abuts on the flange at the winding start side of the secondary bobbin, the winding end side of the secondary bobbin A primary and secondary coil assembly for an ignition coil for an internal combustion engine, wherein an engaging portion is provided at a rear end of a primary bobbin protruding outward from a flange of the internal combustion engine.