JPS6237419Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of a rotor of a magnet generator.

First, a conventional device of this type will be described with reference to FIGS. 1 and 2.

In the figure, 1 is a bowl-shaped flywheel that is rotated by an engine (not shown), and 2 is a magnet fixed to the outer periphery of the flywheel 1 along with a magnetic pole piece 3 to a magnet mounting screw 4, which is magnetized in the radial direction. There is. 5 is a power generation/ignition coil, 6 is a power generation/ignition coil 5 wound around, a flywheel 1, and a magnetic pole piece 3.
1a is a fan for engine cooling provided at multiple locations on the side surface of the flywheel 1, and 7 is fixed to the inner periphery of the flywheel 1, and is connected to another power generating unit (not shown). This is the excitation magnet for the coil.

In the conventional device configured as described above, a notch 1b is provided in a part of the outer circumference of the bowl-shaped flywheel 1 cast from cast iron, and the magnet 2 has a magnetic pole piece 3 on the outer circumferential surface 1c of the notch 1b. screw through 4
It is attached to the outer peripheral side of the flywheel 1 by. The magnets 2 are magnetized with different polarities in the radial direction, and different magnetic poles are formed between the magnetic pole pieces 3 and the outer circumferential portion 1f adjacent to the notch 1b of the flywheel 1. 1 induces a change in magnetic flux within the core 6 installed on the outer circumferential side of the flywheel 1 via a small air gap. Also, this core 6
A power generation/ignition coil 5 is wound around the core 6, and a voltage is generated in response to changes in magnetic flux within the core 6, and current flows through the primary coil wound around the power generation/ignition coil 5. When this is interrupted by an interrupter or a semiconductor control element (not shown), a high voltage is generated in the secondary coil wound around the power generation/ignition coil 5, and the engine is ignited.

Since the conventional flywheel 1 has a structure in which the magnet 2 is attached directly to the outer periphery of the cast flywheel 1, in order to ensure the surface roughness of the outer circumferential surface 1c of the notch 1b which becomes the magnet mounting surface, this outer circumferential surface 1c is It is necessary to perform machining, and in order to facilitate this machining, the engine cooling fan 1a located on the inner circumferential side of the notch 1b is placed on the inner circumferential side of the notch 1b. It was necessary to reduce the outer diameter of the fan 1a. Furthermore, since the magnet 2 is installed on the outer periphery of the flywheel 1, it is necessary to have a sufficiently large mounting strength to withstand centrifugal force, and the mounting strength is secured by adhesion. For this reason, the work of cleaning and heating the flywheel 1 for adhesion was required, and it was also necessary to increase the size of the cleaning and heating equipment to accommodate the size of the flywheel 1.

This idea was made to eliminate the drawbacks of the conventional ones as described above.The magnet is fixed to a magnetic plate with an L-shaped cross section, and by attaching this magnetic plate to the flywheel, the outer periphery of the flywheel can be fixed. No machining of the magnet mounting surface is required, so the size of the engine cooling fan does not need to be changed.
In addition, by fixing the magnets on small magnetic plates, we aim to provide a rotor for a magnet generator that is inexpensive and has better performance, with excellent assembly ease and safety, such as eliminating the need for large equipment. .

An embodiment of the present invention will be described below with reference to FIGS. 3, 4, and 5.

In the figure, a notch 1b is provided in a part of the circumferential direction of a cylindrical part of a bowl-shaped flywheel 1 cast from cast iron, and a magnetic plate having an L-shaped cross section, for example, an outer side 8a of the L-shaped surface of an iron plate 8 is provided in this part. A magnet 2 is bonded to the magnet 2 and fixed together with a magnetic pole piece 3 using mounting screws 4, and this iron plate 8 is tightened and fixed to the side surface of the flywheel 1 using mounting screws 9. The magnet 2 is magnetized in the radial direction to form mutually different magnetic poles between the magnetic pole piece 3 and the outer circumference 1f adjacent to the notch 1b of the flywheel 1.
This rotation generates a voltage in a power generation/ignition coil 5 wound around a core 6 facing the outer circumference of the flywheel 1 with a small air gap interposed therebetween.

In addition, the inner peripheral surface 1 of the flywheel 1 is attached to the iron piece 8.
A contact portion 8b that comes into contact with d is provided to perform radial positioning during assembly and to increase the mounting strength against centrifugal force. Furthermore, the inner peripheral surface 1
d is the same surface or the same machined surface as the machined surface of the inner periphery of the flywheel machined for attaching the anti-magnetic magnet 7, and the flywheel side surface 1e is the machined surface 1e machined for the attachment of the excitation magnet 7. With a simple configuration in which the iron piece 8 and the magnetic pole are made on the same surface or the same processed surface, the accuracy of the mounting position of the iron piece 8 and the magnetic pole is improved, and performance improvement and safety against centrifugal force are ensured.

In the embodiment configured as described above, the magnet 2
is a small cross section L due to the mounting screw 4 together with the magnetic pole piece 3.
After gluing and fixing the magnet 2 to the iron piece 8, it is installed on the outer periphery of the flywheel 1 by attaching the iron piece 8 to the side of the flywheel 1. The heating work for cleaning the magnet 2, iron piece 8, and pole piece 3 and curing the adhesive makes it possible to produce a large amount at once using small-capacity equipment, making it possible to make the quality of the adhesive more stable. Therefore, reliability against detachment of the magnet 2 due to centrifugal force on the magnet 2 caused by rotation of the flywheel 1 can be further improved.
Furthermore, since it is not necessary to process the outer peripheral surface of the flywheel 1 for attaching the magnet 2, the outer diameter of the fan portion of the flywheel 1 can be made the same, so all the fans 1a can be manufactured with the same dimensions. This makes it possible to attach the magnet to the outer periphery of the flywheel 1 without impairing the cooling performance of the engine.

Furthermore, since the iron piece 8 is attached to the side surface of the flywheel 1 by the mounting screw 9, the centrifugal force applied to the iron piece 8 accompanied by the magnet 2 is applied as a shearing force of the mounting screw 9, regardless of the stress caused by tightening the mounting screw 9. It is only necessary to consider the shearing direction, and since the contact portion 8b of the iron piece 8 receives centrifugal force,
Sufficient strength can be obtained simply by attaching the iron piece 8 to the flywheel 1 with the mounting screws 9.

As described above, according to the present invention, by attaching the magnet to the side surface of the flywheel via an iron piece with an L-shaped cross section, there is no need to process the magnet mounting surface of the flywheel, and the magnet can be fixed to a small iron piece. This makes it possible to install large quantities at the same time using small-capacity equipment, and the quality is also stable.By providing a contact area between the iron piece and the inner circumferential surface of the flywheel, it is stronger, cheaper, and more reliable. This makes it possible to supply rotors for high magnet generators.

[Brief explanation of the drawing]

Figure 1 is a front view of the rotor of a conventional magnet generator.
Figure 2 is a side sectional view taken along the - line in Figure 1;
The figure shows a front view of a rotor of a magnet generator showing an embodiment of the present invention, FIG. 4 shows a side sectional view taken along the - line in FIG. 3, and FIG. 5 shows a view taken in the direction of the arrow in FIG. 4. In the figure, 1 is the flywheel, 1a is the fan, 1b is the notch, 1d is the inner peripheral surface of the flywheel, 1d' is the internal magnet mounting surface, 1e is the side surface of the iron piece 8 flywheel, 1e' is the axially machined surface, 1f is the outer periphery, 2 is the magnet, 3 is the magnetic pole piece, 4 is the magnet mounting screw,
5 is a power generation/ignition coil, 6 is a core, 7 is an excitation magnet, 8 is an iron piece, 8b is a contact surface of the iron piece, and 9 is an iron piece mounting screw. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A bowl-shaped flywheel consisting of a cylindrical part and a bottom part, a cooling fan provided on the outside of the bottom part of the flywheel, an inner peripheral magnetic pole attached to the inner peripheral surface of the flywheel cylindrical part, and the flywheel cylindrical part. It has a notch part provided in a part of the part,
An outer magnetic pole is arranged along the radial outer circumference of the bottom and attached to the flywheel via a magnetic plate having an L-shaped cross section, and one surface of the L-shaped magnetic plate is attached to the inner side of the bottom of the flywheel. A rotor for a magnet generator, characterized in that an outer peripheral edge of a surface that contacts the inside of the bottom surface of the flywheel contacts the inner peripheral surface of the cylindrical portion, and is prevented from moving toward the outer peripheral side in the radial direction.