JPH038048Y2 - - 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 excitile for supplying ignition energy to an ignition device of an internal combustion engine. Figure 7 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 in a T-shape with a pole piece 3 at the tip;
The remaining salient pole portion 2f is formed into a substantially I-shape without a pole piece portion at its tip. Armature windings 4a to 4e for supplying power to lighting loads etc. are wound around the salient pole parts 2a to 2e, and a winding 4f constituting an exciter coil 5 is wound around the salient pole part 2f. . Winding 4f constituting the exciter coil
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. This winding 4f
Conventionally, a pole piece part was not provided at the tip of the salient pole part 2f in order to _enable the fitting of the exciter coil. The output is lower,
Especially when the engine is running at low speeds, the ignition performance deteriorates, making it difficult to start the engine.

Therefore, the present applicant previously proposed an exciter coil (Japanese Utility Model Application No. 59-117278) shown in FIG. In FIG. 8, the exciter coil 10 has a winding 4f.
wound around a bobbin 11, and housed in a case 12 made of a resin molded product. The case 12 includes an inner cylinder part 13 having a substantially rectangular cross section that fits inside the bobbin 11, and an outer cylinder part 1 surrounding the winding 4f.
4 is integrally formed with the inner cylindrical portion 13.
and the outer cylinder part 14 are connected by a bottom wall part 15. The winding 4f wound around the bobbin 11 is housed in a space surrounded by an inner cylinder part 13, an outer cylinder part 14, and a bottom wall part 15, and a thermosetting resin 16 such as epoxy is poured into the space. The winding 4f and bobbin 11 are molded and integrated with the case. case 12
A magnetic pole piece 17 is cast into the bottom wall portion 15 of. This magnetic pole piece 17 is provided so that most of it is exposed to the outside, and thin protrusions 17A, 17A... provided at both ends thereof are embedded in the resin constituting the case 12 and fixed to the case 12. ing.

[Problems to be solved by the invention] In the conventional exciter coil described above, the magnetic pole piece 17 is cast during molding of the case 12, and the bobbin 11 on which the winding wire 4f is wound is loaded into the case 12 and then thermosetted. Since the bobbin 11 and the case 12 are fixed to each other by the adhesive resin 16, the number of parts and manufacturing steps are increased, which inevitably increases costs.

An object of the present invention is to provide an exciter coil for an internal combustion engine ignition device that solves the above problems.

[Means for Solving the Problems] The configuration of the present invention that solves the above problems will be explained with reference to FIG. 1 showing an embodiment of the present invention. In the figure, 20 is an armature core. , an I-shaped salient pole portion 22f provided on the armature core 20,
The winding 26f wound around the bobbin 31 is wound to form an exciter coil. In the present invention, the tip 33 of the salient pole portion 22f has a magnetic pole piece fixing protrusion 36 and a contact surface 34 that is located adjacent to the base of the magnetic pole piece fixing protrusion 36 and is brought into contact with the back surface of the magnetic pole piece 37. is formed. A hole 38 in which the pole piece fixing protrusion 36 is provided in the magnetic pole piece 37
is inserted into. And the protrusion 36 for fixing the magnetic pole piece
However, the magnetic pole piece 37 is deformed to the magnetic pole piece 37 side between the deformed magnetic pole piece fixing protrusion 36 and the contact surface 34.
The magnetic pole piece 37 is fixed to the salient pole portion 22f with a portion of the magnetic pole piece 37 being sandwiched therebetween.

[Function] As described above, the pole piece fixing protrusion 36 and the contact surface 34 are formed at the tip of the salient pole part 22f constituting the exciter coil, and the protrusion is deformed to the magnetic pole piece 37 side to produce a deformed magnetic pole piece. Fixing protrusion 36 and contact surface 34
A part of the magnetic pole piece 37 is sandwiched between the magnetic pole piece 37
When fixed, the force necessary for deforming the pole piece fixing protrusion 36 and clamping the magnetic pole piece 37 is only applied to the salient pole part 22f, so a strong force is not applied to the bobbin 31 and the bobbin is not damaged. Moreover, it is possible to reduce the number of parts and reduce costs.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 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 22f protruding radially. Salient pole portions 22a-2
The salient pole 2e is formed in a substantially T-shape having a pole piece 23 at its tip, and the salient pole 22f is formed in a substantially I-shape without a pole piece at its tip. A hole 24 is provided in the center of the yoke portion 21 for passing the rotating shaft of a magnet rotor (not shown), and the armature core 20 is provided around the hole 24 in the case or cover of the internal combustion engine. Attachment holes 25, 25 are provided for passing screws to be attached to the stator attachment portion. Each of the salient pole parts 22a to 22e has an armature winding 26a.
26e are wound, and 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 20 at the parts where the armature windings 26a to 26e come into contact and the parts in the vicinity thereof. Coating 27 is applied.

The winding 26f constituting the exciter coil 30 is wound around a bobbin 31, and is attached to the armature core 20 by fitting a hole in a cylindrical portion 32 of the bobbin 31 with a rectangular cross section to the salient pole portion 22f. Note that the clearance between the hole 32a of the bobbin 31 and the salient pole portion 22f is set to be sufficiently small. Both ends of the winding 26f are led out by lead wires (not shown). As shown in FIGS. 3a and 3b, the tip 33 of the salient pole portion 22f has a pair of abutments that are formed to have a width narrower than the other portions and come into contact with the back surface of a magnetic pole piece 37, which will be described later. Surfaces 34, 34 are formed. Grooves 35, 35 are formed on the end face of the tip 33 of the salient pole portion 22f, and extend in the laminating direction of the steel plates so as to open in the end face of the tip. both ends in the width direction)
Protrusions 36, 36 for fixing magnetic pole pieces are formed on the sides. The aforementioned contact surfaces 34, 34 are formed at positions adjacent to the bases of the pole piece fixing protrusions 36, 36, and together with the pole piece fixing protrusions 36, 36, they sandwich the magnetic pole piece 37.

37 is a magnetic pole piece, and the magnetic pole piece 37 has the tip 3 of the salient pole part 22f in the center as shown in FIGS. 2a and 2b.
3 is inserted into the mounting hole 38. A stepped portion 3 is provided at the end edge of the mounting hole 38 that faces the pole piece fixing protrusions 36, 36 of the tip 33 of the salient pole portion 22f.
9,39 are formed. Embossed protrusions 40, 40 are formed at both ends of the magnetic pole piece 37. Positioning holes 41, 41 corresponding to these protrusions 40, 40 are formed in the bobbin 31.
The protrusions 40, 40 are inserted into the magnetic pole piece 3.
7 is positioned. Then, the magnetic pole piece fixing protrusion 3 of the salient pole portion 22f is inserted into the mounting hole 38 of the magnetic pole piece 37.
6 and 36 are inserted, and both protrusions 36 are connected to the magnetic pole piece 37.
Specifically, the magnetic pole piece 37 is bent and deformed toward the stepped portions 39, 39 side, and due to the deformation of the deformed both magnetic pole piece fixing protrusions 36, 36, the magnetic pole piece 37 comes into contact with the salient pole portion 22f. By being pressed against the surfaces 34, 34, a part of the magnetic pole piece 37 (step portions 39, 39) is held between the magnetic pole piece fixing projections 36, 36 and the contact surfaces 34, 34. As a result of the magnetic pole piece 37 being fixed to the tip of the salient pole portion 22f, the bobbin 31 is slightly pressed against the yoke portion 11 in this example, and the exciter coil 30 is fixed to the yoke portion 11.

The armature core 20 is fixed to a stator mounting portion 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 23 and magnetic pole piece 37. The rotation of the rotor induces a voltage in each winding, and the output of the winding 26f is supplied to an internal combustion engine ignition device (not shown).

According to this embodiment, by simply placing the magnetic pole piece 37 on the contact surfaces 34, 34 of the tip 33 of the salient pole part 22f and bending the magnetic pole piece fixing protrusions 36, 36, the tip of the salient pole part 22f can be fixed. The magnetic pole piece 37 can be fixed to the magnetic pole piece 37, and the work of attaching the magnetic pole piece 37 can be facilitated. As shown in FIG. 4, if the salient pole portion 22
If the width of the tip of f' is the same as the width of the other parts and the abutting surfaces 34, 34 in the above embodiment are omitted, when bending the pole piece fixing protrusions 36, 36, the step of the magnetic pole piece 37 will be removed. This is not preferable because there is a risk that a strong force will be applied to the bobbin 31 via the portions 39, 39 and the bobbin 31 will be damaged.

FIG. 5 shows another embodiment of the present invention.
In this embodiment, when molding the bobbin 31, the magnetic pole piece 37 is cast into the bobbin, and the magnetic pole piece 37 is
and the bobbin 31 are integrated. in this case,
It is necessary to expose most of the surface of the magnetic pole piece 37 to the outside, and it is necessary to provide the magnetic pole piece 37 with a stopper portion 31a in order to prevent the magnetic pole piece 37 from coming off.

FIG. 6 shows still another embodiment of the present invention, in which the tip 33 of the salient pole portion 22f is
A recess 42 is provided at the center in a direction perpendicular to the lamination direction of the steel plates, and pole piece fixing projections 36 are formed at both ends in the perpendicular direction.

[Effects of the invention] As described above, according to the invention, a protrusion for fixing a magnetic pole piece and an abutment surface are formed at the tip of a salient pole part constituting an exciter coil, and the protrusion is deformed to one side of the magnetic pole. In order to fix the magnetic pole piece to the salient pole part by sandwiching a part of the magnetic pole piece between the magnetic pole piece fixing protrusion and the contact surface, the force required to deform the magnetic pole piece fixing protrusion and to clamp the magnetic pole piece is is applied only to the salient pole part, so strong force is not applied to the bobbin and the bobbin is not damaged.
Moreover, it is possible to reduce the number of parts and reduce costs.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
Figures a and b are a plan view and a front sectional view of a magnetic pole piece according to the present invention, respectively, Figures 3 a and b are a plan view and a front view of a salient pole part according to the present invention, and Figure 4
The figure is a front view partially cut away to explain the problem when the salient pole part is not provided with an abutment surface, and FIG. 6 is a cross-sectional view of a main part showing still another embodiment of the present invention, FIG. 7 is a front view showing an example of an armature equipped with a conventional exciter coil, and FIG. FIG. 2 is a front view of an armature equipped with the exciter coil proposed above. 20... Armature core, 22a to 22f... Salient pole portion, 26a to 26f... Winding wire, 31... Bobbin,
34...Abutment surface, 36...Protrusion for fixing magnetic pole piece, 3
7...Magnetic pole piece, 38...Mounting hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A winding wound around a bobbin is wound around an I-shaped salient pole provided in the armature core of a magnet generator, and a magnetic pole piece is fixed to the tip of the salient pole. In an exciter coil for an internal combustion engine ignition system, the tip of the salient pole portion includes a magnetic pole piece fixing protrusion and a position adjacent to the base of the magnetic pole piece fixing protrusion and in contact with the back surface of the magnetic pole piece. a contact surface is formed, the pole piece fixing protrusion is inserted into a hole provided in the magnetic pole piece, and the pole piece fixing protrusion is deformed to one side of the magnetic pole to deform the magnetic pole piece fixing protrusion. An exciter coil for an internal combustion engine ignition system, characterized in that a part of the magnetic pole piece is held between the protrusion and the abutment surface, and the magnetic pole piece is fixed to the salient pole part.