JPS5815624B2 - Magnet generator for ignition signal generation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnet generator for generating ignition signals, and more particularly to a magnet generator for generating ignition signals that has a simple structure and high precision.

First, the structure of a conventional magnet generator for generating an ignition signal will be explained with reference to FIG.

1 is a boss, 2 is a flywheel main body, and is fixed by caulking with studs 3.

A plurality of magnetic pole pieces 9 of a plurality of permanent magnets for power generation in the same number of digits are fixed to the inner periphery of the flywheel by screws or the like.

Further, a power generating coil 10 is wound around the iron core and arranged so as to face this.

This generator coil is the power source for lighting and ignition.

□ Next, on the outer periphery of the boss 1, a permanent magnet 4 for generating an ignition signal is held and fixed by a cup-shaped holder 5 and a cylindrical support 6 having an angular cross-section.

An ignition signal generation coil 7 wound around an iron core 15 is fixed to the inner periphery of the magnetic shielding plate 11 so as to face it, and shields leakage magnetic flux from the outer circumferential power generation permanent magnet to generate a high-quality ignition signal. be.

Reference numeral 12 is a sliding ring made of resin or the like, which is fixed to the tip of the magnetic shielding plate, and is loosely fitted into the central convex cylindrical sliding part of the mounting base 13, which is separately screwed to the engine case 16, and is fixed to the magnetic shielding plate. By moving the supported arm 14 in the radial direction, the opposing position between the iron core 15 of the ignition signal generating coil 7 and the permanent magnet 4 is changed, and the ignition position is changed in accordance with engine rotation.

In any structure, the iron core 15 on which the ignition signal generator coil 7 is wound is fixed to the magnetic shielding plate due to the principle of cantilever burr, which has poor vibration resistance, and the supporting arm 14 and the sliding ring 12 are fixed to the magnetic shielding plate.
Assembling the magnetic shield plate 11 into the magnetic shielding plate 11 has the disadvantage that the assembly workability is poor and the parts cost is also high.

An object of the present invention is to provide a high-performance signal generating magnet generator with a simple structure.

The feature of the present invention is that the inner periphery of a mounting base formed integrally with the ignition signal generation coil is loosely fitted to the central convex sliding part of the engine case, and is made of a cylindrical steel plate and is attached to the main part. A magnetic shielding plate with a plate to prevent the base from being pulled out is placed so as to cover it and fixed with screws to improve the vibration resistance of the ignition signal generator coil and the assembly productivity.

Hereinafter, the embodiments of the present invention will be described in Section 2. This will be explained based on FIG.

Reference numeral 18 denotes a mounting base rotatably and loosely fitted to the sliding surface 16a of the central convex portion of the engine case 16, on which the ignition signal generating coil 7,
It holds an iron core 15 and has a support arm 14 integrally molded with resin, and is rotated by operating the support arm 14 using the convex portion as a guide.

Reference numeral 19 denotes a magnetic shielding plate formed by drawing a steel plate into a cylindrical shape and providing mounting feet 19a on the outer periphery.A retaining plate 20 for preventing the mounting base 18 from coming off is fixed to the main part.

Such a magnetic shielding plate is placed on the upper surface of the engine case so as to cover the mounting base 18, and is fastened and fixed with screws 21.

In this state, by moving the support arm 14 in accordance with the rotational speed of the engine, the ignition signal generating coil on the mount is rotated, thereby advancing the ignition timing.

In order to maintain the above configuration, the ignition signal generating coil 7 and the magnetic shielding plate 19 are separated, the coil mounting base 18 is rotatably mounted using the engine case side as a guide, and then the mounting base is removed. The condition is that a magnetic shielding plate with a stop mechanism be placed so as to cover it.

Therefore, it is possible to provide the two functions of preventing leakage and shielding leakage magnetic flux.

Furthermore, since the mounting base integrally holds the ignition signal generator coil, it has excellent vibration resistance, the overall weight is light, and the sliding surface is stable and large, so it can be used as a retaining plate to prevent the magnetic shielding plate from being removed. This design eliminates the need for excessive force, reduces the number of parts by half, and improves ease of assembly.

Furthermore, as another example, the fourth embodiment is as follows. Referring to FIG. 5, reference numeral 22 is a steel plate drawn into a substantially cup shape, and a retaining plate 23 for preventing the mounting base 18 from coming off is integrally formed.The screw 21 is attached to the end surface of the engine case. The steel plate is further drawn into a concave shape.

In this case, the magnetic shielding plate is made of a single piece of steel.

As described above, according to the embodiment of the present invention, structurally, a part of the engine case is used as the sliding part of the mounting base, which reduces the number of parts by half and further improves assembly productivity.

Mechanically, the ignition signal generator coil and magnetic shielding plate were separated, making the mounting base lighter and improving vibration resistance.

Further, the magnetic shielding plate has the advantage that it can be easily obtained by drawing a steel plate.

According to the present invention, it is possible to provide a magnet generator for generating ignition signals with a simple structure and high performance.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the main part of a conventional magnet generator for generating an ignition signal, FIG. 2 is a longitudinal cross-sectional view of the main part of a magnet generator for generating an ignition signal, showing an example of the present invention, and FIG. is a plan view of the same main part, No. 4
The figure is a longitudinal sectional view of the main part of a magnet generator for generating an ignition signal in another actual case, and FIG. 5 is a plane view of the main part. 16... Engine case, 16a...
Case center part (convex part), 18... Coil mounting base, 19... Magnetic shielding plate, 20... Holding plate.

Claims (1)

[Claims] 1. A boss directly connected to and driven by the crank of the engine, a permanent magnet fixed to the outer periphery of the boss, and a power generator that is excited by the rotation of the permanent magnet and outputs an ignition signal. In a magnet generator for generating an ignition signal, the generator coil is formed integrally with a mounting base made of an insulating material and rotatably fitted into the center of the engine case, and a magnetic generator that covers the outer periphery of the generator coil A magnet generator for generating an ignition signal, wherein the shielding plate includes a retaining plate that prevents the mounting base from coming off in the axial direction by being fixed to the engine case. 2. In the magnet generator for generating an ignition signal according to claim 1, the magnetic shielding plate includes mounting legs bent into an L shape and a retaining plate that locks the upper center surface of the coil mounting base. A magnet generator for generating ignition signals.