JPH0135592Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an exciter coil used for supplying ignition energy to an ignition device of an internal combustion engine.

[Prior Art] A winding wound around the armature of a magnet generator driven by the engine is used as an exciter coil that supplies ignition energy to an ignition device of an internal combustion engine. Figure 1 shows an example of the armature of a conventional magnet generator wrapped with an exciter coil.
In the figure, 1 is an armature core having salient pole portions 2a to 2f. 2a to 2 of salient pole parts 2a to 2f
e is formed into a substantially T-shape (hereinafter referred to as T-shape) with a pole piece 3 at the tip, and the remaining salient pole 2f
is formed into a substantially I-shape (hereinafter referred to as I-shape) without a pole piece portion at the tip. Armature windings 4a to 4e for supplying power to lighting loads and the like are wound around the salient pole parts 2a to 2e, and a winding 4f constituting an exciter coil is wound around the salient pole part 2f. Winding 4f constituting exciter coil 5
Since the number of turns is larger than that of other armature windings, it is wound on a bobbin in a separate process, and after the armature windings 4a to 4e are wound, it is fitted into the salient pole portion 2f.

[Problem to be solved by the invention] Conventionally, a pole piece was not provided at the tip of the salient pole part 2f in order to make it possible to fit the winding 4f, but in such a configuration, the magnetic pole of the exciter coil As the polar arc angle θ ₁ becomes smaller, the output of the exciter coil becomes lower, and the ignition performance deteriorates, especially at low engine speeds, making it difficult to start the engine.

Therefore, as shown in Japanese Utility Model Application No. 56-17882, when a bobbin-wound winding is fitted to an I-shaped salient pole, after the winding is fitted to the I-shaped salient pole, proposed a technique for increasing the polar arc angle by inserting an auxiliary core with magnetic pole pieces into the cylindrical part of the bobbin along with the I-shaped salient pole part. However, inserting the auxiliary core increases the number of parts and requires work to fix the auxiliary core.Furthermore, the diameter of the cylindrical portion of the bobbin increases by the amount that the auxiliary core is inserted, which increases the diameter of the exciter coil. There was a problem with growing up.

The purpose of the present invention is to provide an internal combustion engine ignition system which has a structure in which a bobbin-wound winding is fitted into the salient pole part of an armature core, and which can also be provided with a magnetic pole piece, thereby improving ignition performance. The purpose of the present invention is to provide an exciter coil for use.

[Means for Solving the Problems] The present invention has a plurality of T-shaped salient pole parts and I-shaped salient pole parts radially provided in the yoke part of the armature core,
For internal combustion engine ignition systems, the I-shaped salient pole part is fitted with an exciter coil winding wound around a bobbin, and the multiple T-shaped salient pole parts are wound with armature windings. The above problems occurring in the exciter coil are solved by the following configuration.

The exciter coil for an internal combustion engine ignition system of the present invention has a resin case that integrally includes an inner cylinder part into which the exciter coil winding is fitted inside the bobbin, and an outer cylinder part which surrounds the exciter coil winding. The case is housed together with a bobbin, and an insulating resin is cast into the case. Further, the case is attached to the armature core by fitting the I-shaped salient pole portion inside the inner cylinder portion of the case. Furthermore, the case has a magnetic pole piece that fits or comes into contact with the tip of the I-shaped salient pole fitted inside the inner cylindrical part and is magnetically connected to the tip, exposing the magnetic pole surface. It's infused like that.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

FIG. 2 shows, as an example, an embodiment in which the present invention is applied to an exciter coil provided in a six-pole magnet generator. This is an armature core with 12f protruding radially. Salient pole portions 12a-1
2e is formed in a T-shape with a pole piece portion 13 at its tip, and the salient pole portion 12f is formed in an I-shape without a pole piece portion at its tip. A hole 14 is provided in the center of the yoke portion 11, through which the rotating shaft of a magnet rotor (not shown) passes. Attachment holes 15, 15 are provided for passing screws attached to the child attachment portion. Salient pole part 12a
~12e have armature windings 16a~16e, respectively.
These armature windings are connected to a predetermined number of phases and connected to an external lead wire.
In order to electrically insulate between these armature windings and the armature core, an insulating resin is applied to the outer surface of the armature core 10 at the parts where the armature windings 16a to 16e come into contact and the parts in the vicinity thereof. Coating 1 by
7 has been applied.

The exciter coil winding 16f constituting the exciter coil 20 is wound around a bobbin 21 and housed in a case 22 made of a resin molded product. The case 22 integrally includes an inner cylinder part 23 having a substantially rectangular cross section that fits inside the bobbin 21 and an outer cylinder part 24 surrounding the winding 16f. The space between them is connected by a bottom wall portion 25.
The winding 16f wound around the bobbin 21 is
The winding 16f and the bobbin 2 are housed in a space surrounded by the outer cylinder part 24 and the bottom wall part 25, and a thermosetting resin 26 such as epoxy is cast into the space.
1 is integrated with the case. The bottom wall 25 of the case 22 has a magnetic pole piece 27 as shown in FIG.
is injected into it. This magnetic pole piece 27 is provided so that the magnetic pole surface is exposed to the outside, and thin protrusions 27A, 27A, .
It is embedded in the resin constituting the case 22 and fixed to the case 22. A hole 28 is provided in the center of the magnetic pole piece 27, into which the tip of the I-shaped salient pole portion 12f of the armature core 11 is fitted.

The exciter coil 20 has an inner hole 23A in the inner cylinder part 23 of the case 22 and a hole 28 in the magnetic pole piece 27.
The winding 16f is attached to the armature core 10 by fitting the salient pole portion 12f into the winding 16f, and both ends of the winding 16f are led out to the outside via lead wires (not shown). Sho hole 2
8 and the salient pole portion 12f is set to be sufficiently small.

The armature core 10 is fixed to a fixed mounting part provided on a case or a cover of the engine, and magnetic poles of a magnet rotor (not shown) are arranged to face each pole piece 13 and magnetic pole piece 27. The rotation of the rotor induces a voltage in each winding, and the output of the winding 16f is supplied to an ignition device for an internal combustion engine (not shown). In this embodiment, since the magnetic pole piece 27 is fitted and connected to the salient pole portion 12f, the polar arc angle θ ₂ of the magnetic pole of the exciter coil can be set sufficiently large, and the output of the exciter coil can be increased. I can do it.

In the above embodiment, the tip of the salient pole portion 12f is fitted into the hole 28 of the magnetic pole piece 27, but as shown in FIG. The tip end surface may be brought into contact with the back surface of the magnetic pole piece 27.

[Effects of the invention] As described above, according to the invention, the winding accommodates the magnetic pole piece that fits or contacts the tip of the I-shaped salient pole and is magnetically connected to the tip. Since the exciter coil is cast in a resin case, the diameter of the exciter coil can be made larger than necessary with a small number of parts when a bobbin-wound winding is fitted to the I-shaped salient pole part. Therefore, a wide magnetic pole piece can be easily connected to an I-shaped salient pole part.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of an armature equipped with a conventional exciter coil, Fig. 2 is a front view showing an embodiment of the present invention, and Fig. 3 is a perspective view showing an example of a magnetic pole piece used in the present invention. 4 are sectional views showing essential parts of another embodiment of the present invention. 10... Armature core, 12a to 12e... T-shaped salient pole part, 12f... I-shaped salient pole part, 16f
... Exciter coil winding, 20 ... Exciter coil, 21 ... Bobbin, 22 ... Case, 2
3...Inner cylinder part, 24...Outer cylinder part, 26...Casting resin, 27...Magnetic pole piece.

Claims (1)

[Claims for Utility Model Registration] A plurality of T-shaped salient pole parts and I-shaped salient pole parts are provided radially in the yoke part of the armature core, and the I-shaped salient pole parts are provided with a bobbin. An exciter coil for an internal combustion engine ignition system, in which a wound exciter coil winding is fitted, and an armature winding is wound around the plurality of T-shaped salient pole parts, wherein the exciter coil winding The wire is housed together with the bobbin in a resin case that integrally includes an inner cylinder part that fits inside the bobbin and an outer cylinder part that surrounds the exciter coil winding. The I-shaped salient pole part is fitted inside the inner cylindrical part of the case, and the case is attached to the armature core; A magnetic pole piece that is magnetically connected to the tip of the I-shaped salient pole by fitting into or abutting the tip is cast so as to expose the magnetic pole surface. Exciter coil for internal combustion engine ignition system.