JPS58139667A - Flywheel magneto - Google Patents

Abstract

PURPOSE:To obtain the prescribed electromotive force of a flywheel magneto by press-futting an engaging part formed at a generating core at the rib of the end which is stood on the mount of a stator, and caulking the end of the rib, thereby preventing the core from removing from the normal mounting position. CONSTITUTION:A thick mounting base 14 is formed at a stator 1, first and second ribs 151, 152 which are coverged to the ends toward the end are stood, for example, on the upper end of the base 14, and the first and second notch grooves 214, 215 are, for example, formed at the part except the surface which is opposed to the permanent magnet 5 of the core 21 of the first generating element 2. The ribs 151, 152 are respectively press-fitted to the first and second grooves 214, 215 of the core 21, caulked at the upper ends in the state that the lower surface of the core 21 is contacted under pressure with the upper surface of the base 14, and the element 2 is mounted on the base 14. In this manner, the core 21 is restricted in the elevational position with the caulked parts of the ribs 151, 152 and the base 14, thereby preventing the displacement due to vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flywheel magneto in which a generator attached to a mounting portion of a stator generates an electromotive force by rotation of a flywheel around which a permanent magnet is arranged.

In such a flywheel magnet, there is a permanent magnet between the inner surface of the permanent magnet, which moves in phase as the flywheel rotates, and the end surface of the generator core attached to the stator. A predetermined magnetic gap is formed by the movement. By the way, in order to generate a predetermined electromotive force in the generator, it is necessary to maintain a constant magnetic gap, and for this purpose, the generator needs to be mounted at a fixed position on the mounting portion. In conventional flywheel magnets, the generator is simply fixed to the mounting part with screws. On the other hand, since the magnetic gap is very narrow and even a slight change in the magnetic gap has a large effect on the generation of electromotive force of the generator, it is undesirable for the installation position of the generator to change even slightly. However, if the generator is simply fixed to the mounting part with screws as in conventional flywheel magnets, the screws may loosen due to vibration, which is a disadvantage of screwing means. Since the mounting position of the generator may deviate from the normal mounting position, in this case there is a drawback that the generator cannot generate a predetermined electromotive force.

An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a flywheel magneto in which a generator can be attached to a mounting part so that the generator does not shift from its normal attachment position even if vibration occurs. That's true.

Hereinafter, one practical example of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a plan view of a stator in a flywheel magnet used in a motorcycle engine according to an embodiment of the present invention, and FIG. FIG. 8 is a bottom view thereof. In these figures, the reference numeral (1) indicates a disc-shaped stator made of aluminum or the like, and the inner circumferential surface (b) included in a circle with a radius R1 having the center of the stator (1) as O. for,
1st. Second. The eighth generators (2), (3), and (4) are attached by attachment means, which will be described later, which is the most characteristic feature of this invention. The first generator (2) is a 6D charging coil for charging the capacitor included in the capacitor discharge type ignition device, and the second generator (3) is for charging the vehicle battery and lighting the ffuf[A light, etc. The third generator (4) is a pulser coil for generating an ignition signal included in the device. Here, the description of the capacitor discharge type ignition device will be omitted because it is not important in this invention.

On the other hand, the outer circumferential surface area surrounded by a circle with a radius R1 and a circle with a radius R2 with the center of the stator (1) as 0 has an inner surface of a flywheel that rotates in conjunction with the output shaft of an internal combustion engine (not shown). Permanent magnets (
5)... is located, and by the rotation of the ζ' flywheel, the permanent magnets (5)... move around on the outer peripheral surface (2) of this stator (1), and the permanent magnets (5)...・In response to this circular movement, the first. Second. A predetermined electromotive force is generated in the third generator (2), (3), and (4).

Next, the attachment of each such generator to the stator (1) will be explained using the first generator (2) as an example.

The first generator (2) consists of a core, a coil bobbin (A), and a coil wire (product), and both ends of the core (C) are inserted through the coil bobbin (A), and the stator (1)
) faces the boundary between the inner peripheral surface part αυ and the outer peripheral surface part (a). That is, at both ends of the core (c) of the first generator (2), there are first magnets facing the permanent magnets (5). Second end face part (2
11) (211') and 1st. Second side end surface portion (21
2) (212') and the first one that holds the coil bobbin (c). A second clamping surface part (218) (21g') is formed, and a first clamping surface part (218) (21g') of the core (E) is formed.
218) and the first side end surface portion (212), respectively.
．． The second notch grooves (214) (215) are formed and the second clamping surface part (218') of the core (goods)
and the second side end surface portion (212') are formed with 8.degree. fourth notch grooves (214') and (215/), respectively. Symbols (151) to (154) are the first to fourth ribs installed on the mounting base Q41 (described later) of the stator (1), and the first and second ribs (151) and (152) are Said 1st. The eighth. The fourth rib (15111) (154) is the eighth rib (15111) (154).
．． It engages with the fourth notch groove (214') (2x5').

The first generator (2) has the first to fourth notch grooves (214) (215) (214') (215') of its core Q1).
) through the first to fourth ribs (151) to (154)
The first to fourth ribs (151)-(
154) by caulking the upper end of the first generator (
2) is attached to a mounting base Q4 which will be described later.

Next, the manner in which the first generator (2) is attached to the mounting base α◆ will be explained in more detail with reference to FIG. 4.

FIG. 4 is a cross-sectional view taken along section line IV-IV in FIG. 1, and in particular, FIG. No. 41b (
2) shows the claw' after installation. Stator (1
), a thick mounting base Q4 is formed, and the mounting base Q
On the top surface of 4, there is a tapered first part that becomes smaller in diameter toward the tip.
゜Second ribs (151) (152) are provided upright.

This mounting Q4 and the 1st. The second rib is the stator (1)
are integrally molded at the same time when they are cast. The first. formed in the core (2) of the first generator (2). The notch diameter of the second notch grooves (214) (215) is the same as that of the first. The first rib (151) (152) except the tip portions of the second rib (151) (152). The diameters of the second ribs (151) (152) are also smaller. Therefore, as shown in FIG. 4 (1), the first generator (2
) the end of the core (goods) of the first. Second notch groove (214
) (215) is the first. It is positioned above the mounting base α◆ so as to face the second rib (151X152), and then the first rib of the core Qυ. While press-fitting the first and second ribs (151X152) into the second (D notch grooves (214X215)), press down the first generator (2) downward on the figure, as shown in Figure 4 (2). As shown, the lower surface of the core (C) of the first generator (2) comes into pressure contact with the upper surface of the mounting base α◆ of the stator (1).At this time, the first and second notch grooves (214) (215
) and protrudes above the upper surface of the core (c).
．． When the upper ends of the second ribs (151) and (152) are crushed and caulked as shown by the chain line, the core (c) and both ribs (1
51) The upper end caulking part of (152) and the upper surface of the mounting base α◆ restrict the vertical position in Fig. 4, and thereby the first generator (
2) It is prevented from shifting from the normal position.

In addition, the core Qυ is placed in the first position so as not to be displaced even by vibration in the direction perpendicular to the plane of the paper in FIG. Second rib (15
1) The position is regulated by (152).

In addition, the core leg of the pulsar coil (4) fits into the groove of the mounting part of the stator (υ), so it is fixed by one rib G1. In this case, the rib (b) is attached to the pulsar coil (
4) engages with the hole formed in the core. Note that the installation of the second generator (3) is the same as that of the generator (2) in Collection 1, so a description thereof will be omitted.

In addition, in order to guide the electromotive force generated in each generator (2), (3), and (4) arranged on one inner circumference (b) of the stator (1) to the outside, a large number of leads are usually provided. Wires are intricately wired to the stator (1). In order to simplify this complicated wiring, the stator (1
) on the other inner peripheral surface (bottom surface) of the printed wiring board σ0
caulk, and attach each generator (2) to this printed wiring board (6).
) (3) A conductive pattern oQ for conducting the electromotive force generated in (4) to the outside is formed by a known etching process, and the conductive pattern aQ is connected to the connector α.
Power connector pin (to)... is connected.

In addition, as the rotor (not shown) rotates, the permanent magnets arranged on the outer peripheral surface of the flywheel pass through the end faces of the cores of the first to eighth generators (2), (3), and (4). When doing so, a magnetic gap is formed between the end face of the permanent magnet a and the end face of each of the cores of these generators (2), (3), and (4), resulting in an increase in magnetic resistance. (To prevent this, in this embodiment, for example, first and second notch grooves (214) (21a) are formed on the clamping end faces (218) (218') of the core (c) of the first generator (2). and the eighth and fourth notch grooves (215) (215') are formed on the end face (212) (21f) of the core (C), excluding the end face of the core Qυ. However, the shape and formation position of the notch grooves are not necessarily limited to those shown in this embodiment, and the number of notch grooves and therefore the number of ribs formed is two at the end of each core as in this embodiment. It is not necessarily necessary, and one may be sufficient as long as the generator can be press-fitted.

As explained above, according to the present invention, in the flywheel magneto in which the generator attached to the mounting part of the systator generates an electromotive force by the rotation of the flywheel around which the permanent magnet is arranged, the end face of the permanent magnet is An engaging portion is formed in a portion of the generator core other than the end face where the generator core faces and forms a magnetic gap, and a tapered rib that engages with the engaging portion when the generator core is press-fitted is formed in the mounting portion of the stator. The rib is configured so that the generator core is attached to the mounting portion by caulking the tip of the rib when the generator core is press-fitted, so there is no possibility of loosening due to vibration as in the prior art. Unlike the screw-fastening method that occurs, the generator core can be press-fitted into a rib provided upright at the stator mounting part, and the generator core can be attached by caulking the tip of the rib. Therefore, even if vibration occurs, the screw-fastened part remains Since there is no looseness after installation, there is no possibility of loosening.

In addition, since the generator core is attached by being press-fitted into the rib, there is no risk of it shifting from the normal mounting position), so a predetermined magnetic gap is maintained, and the generator generates a predetermined electromotive force stably. Effects such as being able to

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view thereof, FIG. 2 is a right side view thereof, FIG. 8 is a bottom view thereof, and FIG. 4 is a cross-section of FIG. 1. These are cross-sectional views taken along line W--■, and FIG. 4 (1) of the inner cylinder shows the front side of the press-fitting of the generator, and FIG. 4(2) shows the rear of the press-fitting of the generator. (1)... Stator, (2) (3) (4)...
Generator, α◆...Mounting part, (151) to (154)
°°°Rib, (211) to (214)...notch groove Patent applicant Yamaha Motor Co., Ltd. Representative Patent Attorney Oka 1) Hide Kazu Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) In a flywheel magnet, a generator attached to a stator mounting part generates an electromotive force by rotating a flywheel around which a permanent magnet is arranged. An engaging portion is formed in a portion of the electronic core other than the end face, and a tapered rib is provided on the mounting portion of the stator to engage with the engaging portion when the power generation core is press-fitted, and the rib is connected to the mounting portion. 1. A flywheel magnedo, characterized in that the generator core is press-fitted into the flywheel magneto and the tip of the generator core is caulked to attach the generator core to the mounting portion. (2) In the flywheel magnet G according to claim 1, the engaging portions of the generator core are formed at at least two locations on the edge of the generator core, and the ribs are formed in at least two places on the edge of the generator core. A flywheel magneto is provided upright in the same number as the engaging portions so as to engage with each of the engaging portions, and a generator core is press-fitted between the ribs.