JPS6012864B2 - Rotor of magnet generator and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor for a magnet generator, and relates to a compact, high-strength, high-precision structure and manufacturing method.

First, the structure of a conventional magnet generator as shown in Japanese Unexamined Patent Publication No. 52-156313 will be explained with reference to FIG. 1 is a drive shaft of the engine; 2 is a tapered portion at the tip of the shaft; 3 is a boss having a cylindrical portion 4 and a flange portion 6; the cylindrical portion 4 is fitted to the tapered portion; The metal inspector 5 is constructed integrally with the cylindrical portion 4 by cold tsuba-zukuri or the like.

6 is a nut that is screwed onto the end of the drive shaft 1 and presses the cylindrical portion 4 to a part of the taper via the washer 7; 8 is a mirror hole drilled in the flange portion 5; 9 is a main body of the flywheel. A flywheel yoke formed from a steel plate 1 river A plurality of permanent magnets 11
It has the same number of magnetic pole pieces 12 as the permanent magnet 1.
1 and magnetic pole pieces 12 are arranged alternately on the same circumference centered on the drive shaft 1, and the inscribed surface of the magnetic pole piece 12 is connected to the generating coil 1.
It faces the fixed iron core 14, which is wound with the iron core 3, through a gap.

Reference numeral 15 denotes a stud which connects the flywheel vertical iron disc member 101 of the flywheel main body 9 and the flange 5, and the iron on the diameter 4-6 side, which is usually formed from mild steel wire for rivets, is 6-9.
This book is used.

151 is a rivet head, and 152 is a rivet head on the vertical side.

Reference numeral 16 denotes an ignition interrupter, which is operated by a cam formed partially on the outer periphery of the cylindrical portion 4 with an arm 19 inserted into a shaft 18 fixed vertically to a board 17, and connected to a generator board 20 fixed to the engine case. It is screwed together with the fixed iron core 14.

In such a structure, the gap between the stud head 151 and the generating coil 13 is a necessary dimension to prevent interference when the flywheel main body 9 rotates, and in order to shorten the overall length, it is necessary to Thickness of the member, flange material thickness t2, rivet head thickness t
This can be done by making the wheel thinner or eliminating one of them. However, if a large moment of inertia is required, it is advantageous to use a wheel mainly made of thick steel plate, but it is not possible to achieve a large capacity. It was difficult to put it into practical use because it required the use of a press machine, which led to high equipment costs, and processing the disc member to make it thinner to shorten the overall length required unnecessary processing costs.

Furthermore, as a means of increasing the moment of inertia, there is a method of integrally molding an inertia ring on a part of the boss, but this also results in an expensive boss.

On the other hand, in this type of generator, the rotor is '
There is no problem with the normal rotation speed of 11,000 RPM.
〇｝Do not break at 22,000 RPM, N-40℃
It must satisfy various conditions such as being able to withstand thermal changes of ~180 oo.

Taking these conditions into consideration, conventionally the rotor boss flange and wheel main yoke were fixed with iron, but the vertical mirror holes and pitch dimensions of the rivets had to be finished with high dimensional accuracy. The required strength after cotton filling cannot be satisfied, and the difference in the loosening of the rivets becomes a problem.As a result, the processing cost and assembly cost of the parts are naturally high.The purpose of the present invention is to provide mechanically stable, yet An object of the present invention is to provide a rotor for a magnet generator whose wheel main body is cylindrical, and its manufacture.

A feature of the present invention is that a groove is provided along the entire circumference between the outer circumference of the disc member and the inner circumference of the flywheel yoke, a ring-shaped coupling member is inserted between the grooves, and the coupling is performed by the tightening force of the coupling member. , the bonding force is maintained by the shearing force of the bonding member.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 5.

Reference numeral 21 is a cylindrical post made of steel, which has no flange, has a cam on its outer periphery, and has a key groove 22 formed on its inside.

First, the boss 21 and the disc member 101 are aligned in the designed position using a mold 40, and another metal material such as a mild steel wire rod is formed into a substantially ring shape as shown in FIGS. 3 and 4. , or a punched-out material having the same effect as the coupling member 24, which is inserted into the concave groove 2 provided on the outer periphery of the boss 21 and the inner periphery of the disc member 101, respectively.
11 and 91, and is pressurized by a mold 30 to cause the connecting member 24 to plastically flow for connection. groove 211,
The depth of 91 is preferably about 0.1 to 1.0 ribs. If it is too shallow, sufficient cutting strength will not be obtained, and if it is too deep, a large pressing force will be required to insert the coupling member. Furthermore, boss 21
Flywheel yoke cylindrical part 9 made of a steel plate formed into a cylindrical shape
0 to the designed position using molds 40 and 41, and the same joint village 24' as described above is formed in a concave groove provided on the outer periphery of the disc member and the inner periphery of the cylindrical part of the flyhole yoke. 92,9
01 and pressurized with the mold 300 to form the joining member 24.
′ is made to flow plastically to achieve connection.

It is desirable that the depth of the grooves 92, 901 be the same as described above. If the bottom surfaces of the grooves 92, 901 are provided with irregularities of about 0.2 to 0.5 depth by knurling or the like over the entire circumference, the rotating torque can be improved. As shown in FIG.
Concentricity is maintained at 0, resulting in highly accurate coupling.

In the joining process, first, as shown in FIG. 6, the joining member 24 is inserted into the gap 2401 between the flywheel main body 9 and the post 21.

Next, as shown in FIG. 7, the entire assembly is placed on a mold 40, and the joining member 24 is applied with the pressurizing part 32 of the mold 30, which has a tip end surface 31 of 4 mm wider than the gap width To. The coupling member 24 is forced into the grooves 91 and 211 by plastic deformation.

The insertion process shown in FIG. 6 may also be performed using the mold 30.
In the state shown in FIG. 6, the coupling member 24 is surrounded by a cavity 240 except for the upper and lower end portions corresponding to the molds 30 and 40, and the difference in height is very small. Therefore, it can be said that in the state immediately before pressurization, the entire joining member is surrounded by the void and the mold. Therefore, as shown in Figure 7, when pressurizing,
The coupling member rarely escapes outside the cavity. 7th
As shown in the figure, the pressure protruding side surface 33 of the mold 30 is inclined by 0 with respect to the direction perpendicular to the tip portion 31 (insertion direction).

8 is preferably about 60 to 15 degrees.

This is because the mold 30 becomes difficult to come out after joining when 8 is 4. In addition, if 8 is too large, the coupling member tends to flow out of the cavity in the opposite direction to the insertion direction of the mold, and the insertion depth cannot be made deep, causing large internal stress in the coupling member. Therefore, it becomes difficult to obtain a large bonding force. As shown in FIG. 7, the mold pressurizing part 32 minimizes the distance S between its tip 31 and the upward slope of the grooves 91, 211, in other words,
It is desirable that the grooves 91 and 211 be inserted as deeply as possible.

This reduces friction loss associated with plastic flow,
The coupling member can be fully inserted into the groove. In order to maintain the above configuration, the flywheel body 9 and the boss 21 must be
The material must be harder and more rigid than the connecting member 24.

That is, the joint portion 24 is required to be made of a material with lower deformation resistance than the flywheel main body 9 and the boss 21. By inserting the coupling member 24 into the cavity 240 and filling it, a tension force is generated in the coupling member in the radial direction.

In addition, the grooves 91 and 211 generate a connecting force against external forces in all directions of the shaft, and a strong bonding force is obtained by both. The inner periphery of the iron is joined using a joining member.

As described above, according to the present invention, structurally, the rivet 15 and the collar portion 5 of the boss 21 are unnecessary, so that the axial direction can be shortened.

The effect is that the length in the axial direction is significantly increased by about 15%, making it smaller and lighter, while at the same time leading to the miniaturization of the engine itself equipped with this magnet generator. Furthermore, since the flywheel yoke can be divided into a cylindrical part and a disc part, it is easy to obtain a flywheel yoke with a large moment of inertia, which significantly improves the productivity of parts. Assembly man-hours can be reduced.

In addition, since the boss does not require a tsuba, it has a simple shape and improves productivity. Next, mechanically, as shown in Figure 2, static strength is tested in the direction of arrows F and F2.
When the connecting member is made of European steel, the weight is stable at 32 kg/side 2. The most important mechanical strength for a magnet generator is that it has sufficient surplus power to withstand angular acceleration and impact. In this respect, in the case of riveting, there is a slight gap and is therefore unstable, whereas the present invention uses a joining method with no gaps, so high reliability is guaranteed. As described above, according to the present invention, compared to conventional joining methods such as riveting, the fastening strength is stably high, the axial structural dimension is small, and the flywheel yoke can be made into a cylindrical shape. As a result, a yoke with a desired moment of inertia can be easily obtained, and the pressurized assemblability is excellent.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the main part of a conventional magnet generator, FIG. 2 is a longitudinal cross-sectional view of the main part of a magnet generator according to an embodiment of the present invention, and FIG.
, FIG. 4 is a diagram showing an example of the shape of the coupling member of the present invention, and FIG. 5 is a longitudinal cross-sectional view of a main part showing the coupling method according to the present invention.
FIGS. 6 and 7 are explanatory diagrams of the bonding process and bonding state according to the present invention. 11... Drive shaft, 3... Boss, 9...
...Flywheel main body, 10...Flywheel yoke, 24...Connecting member. Figure 5 Figure 7 Appearance Figure 2 Figure 3 House Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A magnet generator comprising a boss fitted to a drive shaft and a substantially cylindrical flywheel yoke disposed around the outer circumference and having a permanent magnet fixed to the inner circumferential surface. In the rotor, the outer periphery of the tip of the boss, each having an annular groove formed on the entire periphery, the inner and outer peripheries of the flywheel yoke disk member, and the inner periphery of the cylindrical part of the flywheel yoke are opposed to each other through a gap. . A rotor for a magnet generator, characterized in that the mutual parts are connected by a metal connecting member press-filled into each of the grooves through the gap. 2. In the rotor of a magnet generator, which is equipped with a boss that is fitted onto the drive shaft and a cylindrical flywheel yoke that is arranged around the outer circumference and has a permanent magnet fixed to the inner circumferential surface, Grooves are formed on the inner and outer peripheries of the disc member of the opposing boss and the flywheel yoke, as well as on the entire inner periphery of the cylindrical part of the flywheel yoke, so that the boss and the flywheel yoke face each other with gaps. Made of a material that has lower deformation resistance than the material and has a predetermined mechanical strength,
A substantially ring-shaped metal coupling member having a height equal to or similar to the groove is provided, and then the coupling member is inserted into the gap, so that the entire coupling member substantially covers the inner and outer periphery of the disc member, the fly The wheel yoke cylindrical part/boss part is surrounded by the mold, and the joining member is inserted into the groove by the mold convex part, and is caused to flow plastically into the groove to reduce the tension of the joining member. A method for manufacturing a rotor for a magnet generator, characterized in that the rotor is coupled at the .