JP2001112192A - Stator for flywheel magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stator for a flywheel magnet, in which the strength of an engaged part between a salient pole on which a power generating coil is wound and an annular part can be improved. SOLUTION: Power generating coils 8 are wound on a plurality of salient poles 6 of a stator core 4, in which the respective salient poles 6 are installed so as to protrude on the outer circumference of an annular part 5. At least, one salient pole 6 among the salient poles 6 has a dovetail part 12 in its base part, the salient pole 6 which has the dovetail part 12 is compressively engaged and fixed to a dovetail slot part 13 on the outer circumferential part of the annular part 5, and a compressively engage part 14 is formed. The dovetail part is formed in a plurality of step structures as dovetail parts 12a, 12b in the longitudinal direction of the salient pole 6. The dovetail slot part is formed in a plurality of step structures as dovetail slot parts 13a, 13b in the depth direction of a groove, in such a way that the dovetail parts 12a, 12b in the plurality of step structures can be engaged compressively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel magneto stator for use in a flywheel magneto mounted on an engine such as an outboard motor.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, a flywheel magneto is composed of a flywheel 1 which is a rotating body which is fixedly fitted to a boss 1a of an engine shaft of an engine and rotates. A rotor 3 having a permanent magnet 2 fixed to the inner periphery of the portion and a salient pole 6 on the outer periphery of the annular portion 5 of the stator core 4 disposed in the flywheel 1 generate electric power via a resin bobbin 7. A stator 9 configured by winding a coil 8 and fixed to an engine case;
The pulser 11 generates a pulse-like trigger signal for ignition each time it faces a reluctor 10 intermittently protruded from the outer periphery of the rotating boss 1a.

The stator 9 has a structure in which a power generating coil 8 is wound around each salient pole 6 on the outer periphery of the annular portion 5 of the stator core 4 as shown in FIGS. The power generation coil 8 includes a lamp coil 8a for lighting a lamp and charging a battery, an exciter coil 8b for obtaining electric energy for ignition of an internal combustion engine, and the like.

Generally, the lamp coil 8a has a large coil wire diameter due to its output characteristics, and is formed by being wound around the salient pole 6 integrally formed with the annular portion 5 of the stator core 4 in manufacturing.

[0005] However, the exciter coil 8b is
Since a high voltage output is required in order to obtain ignition energy, it is difficult to wind the salient pole 6 integrally formed on the annular portion 5 of the stator core 4 in manufacturing. That is, since the exciter coil 8b winds a large number of thin copper wires, and the upper surface treatment of the surface is strictly performed to ensure the quality, the exciter coil 8b needs to be performed in a process different from that of the lamp coil 8a. Therefore, the exciter coil 8
b is wound around a convex pole 6 separated from the annular portion 5 via a bobbin 7, subjected to an overcoating process, and then a dovetail portion 12 integrally formed at the base of the convex pole 6 is attached to the outer peripheral side of the annular portion 5. Slot 1
3, the press-fitting portion 14 was formed and fixed.

On the other hand, the pulsar 11 is a pulsar support plate 1.
5 is fixed by screws 16. Pulsa support plate 1
Reference numeral 5 is fixed to the outer periphery of the engine shaft by screw connection.

A ring gear 17 for rotating an engine shaft via the flywheel 1 at the time of starting is fixed to the outer periphery of the flywheel 1.

[0008]

However, in the above-described conventional flywheel magneto stator 9 used in the conventional flywheel magneto, the exciter coil 8
Since the salient pole 6 wound with b is attached to the annular portion 5 only by the press-fitting strength of press-fitting the dovetail portion 12 at the base thereof into the dovetail groove 13 on the outer peripheral side of the annular portion 5, an outboard motor or the like Exciter coil 8b which was built in and received severe vibration
Since the center of gravity is located on the outer diameter side and is subject to vibration, the press-fitting portion 14 between the dovetail portion 12 and the dovetail portion 13 undergoes fatigue deformation, so that the press-fitting tightening margin cannot be secured, and the press-fitting portion 14 becomes loose. In other words, the salient pole 6 around which the exciter coil 8b is wound may come off the annular portion 5.

An object of the present invention is to provide a flywheel magneto stator capable of improving the strength of a press-fitting portion between a salient pole around which a generating coil is wound and an annular portion.

Another object of the present invention is to provide a flywheel magneto stator capable of improving the strength of a press-fit portion between a salient pole around which an exciter coil is wound and an annular portion.

[0011]

According to the first aspect of the present invention, a power generating coil is wound around each of the salient poles of a stator core having a plurality of salient poles projecting from an outer periphery of an annular portion. At least one of the salient poles has a protruding portion at the base thereof, and the protruding pole having the protruding portion improves a flywheel magneto stator which is press-fitted and fixed to a protruding groove on the outer peripheral side of the annular portion.

In the first aspect of the present invention, at least one salient pole has a multi-stage structure in the longitudinal direction of the salient pole. The annular groove has a multi-stage structure in the depth direction of the groove so that the multi-stage structure can be press-fitted.

With such a structure, the convex portion of the salient pole and the concave groove of the annular portion are press-fitted in a multi-stage structure to form a press-fitting portion. Even if it is received, it is possible to prevent the press-fitting portion from being loosened.

According to a second aspect of the present invention, a power generating coil is wound around each of the salient poles of a stator core having a plurality of salient poles projecting from an outer periphery of an annular portion, and an exciter coil among these salient poles is wound. The protruding pole having a protruding portion has a protruding portion at the base thereof, and the protruding pole having the protruding portion improves a flywheel magneto stator press-fitted and fixed to a protruding groove on the outer peripheral side of the annular portion.

[0015] In the flywheel magneto stator according to the second aspect, the protruding portion around which the exciter coil is wound has a multi-stage structure in the longitudinal direction of the protruding pole. The annular groove has a multi-stage structure in the depth direction of the groove so that the multi-stage structure can be press-fitted.

With such a structure, the protruded pole portion around which the exciter coil is wound and the protruded groove of the annular portion are press-fitted in a multi-stage structure to form a press-fitting portion. Also, even if the exciter coil receives vibration during use, it is possible to prevent the press-fitting portion from being loosened.

[0017]

1 and 2 show an embodiment of a flywheel magneto stator according to the present invention. FIG. 1 shows a main structure of a flywheel magneto stator according to this embodiment. FIG. 2 is a front view showing a state before mounting a salient pole around which an exciter coil is wound around the annular portion of the stator core in FIG.

In the flywheel magneto stator 9 of the present embodiment, the protruding portions of the salient poles 6 around which the exciter coil 8b is wound are provided as a plurality of protruding portions 12a and 12b in the longitudinal direction of the protruding poles 6 (two stages). ) It has a structure. The first-stage dovetail portion 12a is provided in the same size as the conventional one, and the second-stage dovetail portion 12b is formed at the bottom of the first-stage dovetail portion 12a in a shape smaller than the first-stage dovetail portion 12a. ing. The dovetail groove portion of the annular portion 5 has a dovetail portion 12a, 12
b is located in the depth direction of the groove so that the groove 13a,
13b has a multi-stage (two-stage) structure. The protruding portions 12a and 12b of the salient pole 6 around which the exciter coil 8b is wound are press-fitted into the press-fitting portions 13a and 13b of the annular portion 5 having the multi-stage structure. 14 are formed. Other configurations are formed in the same manner as in FIGS. 3 to 5 described above.

With such a structure, the protruding portions 12a and 12b of the salient pole 6 around which the exciter coil 8b is wound are provided.
The press-fitting portion 14 is formed by press-fitting the groove 13a and 13b of the annular portion 5 in a multi-stage structure so that the press-fitting portion 1 is formed even when the exciter coil 8b is vibrated during use.
4 can be prevented from loosening.

Although the present embodiment has shown the case where the dovetail portion and the dovetail groove each have a two-stage structure, the present invention is not limited to this, and it is necessary to further increase the strength of the press-fitting portion. It is also possible to provide three or more recessed portions and recessed grooves, respectively.

In this embodiment, an example has been shown in which the salient pole 6 around which the exciter coil 8b is wound is formed separately from the annular portion 5 and is integrated with a press-fitting portion formed of a portion and a groove. The present invention can be similarly applied to a salient pole on which another power generation coil is wound.

[0022]

In the stator for a flywheel magneto according to the present invention, at least one salient pole has a multi-stage structure in the longitudinal direction of the salient pole, and an annular groove has a multi-stage structure with a multi-stage structure. Is formed in a multi-stage structure in the depth direction of the groove so that the press-fitting portion can be press-fitted. It is possible to prevent the press-fitting portion from being loosened even when subjected to vibration during use.

[Brief description of the drawings]

FIG. 1 is a front view of a main part configuration showing an example of an embodiment of a flywheel magneto stator according to the present invention.

FIG. 2 is a front view showing a state before mounting a salient pole on which an exciter coil is wound around an annular portion of a stator core in FIG. 1;

FIG. 3 is a longitudinal sectional view of a conventional flywheel magneto.

FIG. 4 is a front view of a conventional flywheel magneto stator.

FIG. 5 is a front view showing a state before mounting a salient pole on which an exciter coil is wound around an annular portion of a stator core in a conventional flywheel magneto stator.

[Explanation of symbols]

 Flywheel 1a Boss part 2 Permanent magnet 3 Rotor 4 Stator core 5 Annular part 6 Salient pole 7 Bobbin 8 Power generation coil 8a Lamp coil 8b Exciter coil 9 Stator 10 Reluctor 11 Pulser 12, 12a, 12b With part 13, 13, a, 13b With groove part 14 Press fitting part 15 Pulser support plate 16 Screw 17 Ring gear

Claims (2)

[Claims] 1. A stator core having a plurality of salient poles protruding from an outer periphery of an annular portion. A power generating coil is wound around each salient pole, and at least one of the salient poles is located at a base thereof. The salient pole having the dovetail portion is a stator for a flywheel magneto which is press-fitted and fixed to a dovetail portion on the outer peripheral side of the annular portion, wherein the dovetail portion has a multi-stage structure in the longitudinal direction of the salient pole. The stator for a flywheel magneto, wherein the dovetail groove portion also has a multistage structure in a depth direction of the groove so that the dovetail portion having a multistage structure can be press-fitted. 2. A power generating coil is wound around each of the salient poles of a stator core having a plurality of salient poles projecting from an outer periphery of an annular portion, and among the salient poles, the salient pole for winding an exciter coil is provided. A salient pole having a dovetail portion at a base portion, wherein the salient pole having the dovetail portion is a flywheel magneto stator which is press-fitted and fixed to a dovetail portion on an outer peripheral side of the annular portion, wherein the salient pole having the exciter coil wound thereon is provided. The dovetail portion has a multi-stage structure in the longitudinal direction of the salient pole,
The stator for a flywheel magnet, wherein the dovetail groove portion of the annular portion has a multi-step structure in a depth direction of the groove so that the dovetail portion of the multi-step structure can be press-fitted.