JP3797945B2 - Yoke of rotating electrical machine and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a yoke for a rotating electrical machine and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, in general, in a motor yoke, it is necessary to increase the thickness of the magnet mounting portion in order to improve the magnetic characteristics of the motor. As one of the methods, a manufacturing method in which the yoke is formed with a plate material having the same thickness as that required for the magnetic properties of the magnet mounting part can be considered, but since a thick material is used, the magnet is mounted. Other portions other than the portion are also thick, and the weight of the entire yoke is increased. This has been a problem in reducing the weight of the motor.
[0003]
Therefore, conventionally, a method has been used in which another part processed into a ring shape is covered on the yoke cylinder portion of the magnet mounting portion shown in FIG. More specifically, in the method shown in FIG. 10, first, the yoke cylinder portion 41 having a predetermined shape is formed from a thin plate material. Thereafter, an iron ring-shaped member 43 having an inner diameter equal to the outer diameter of the yoke tube portion 41 and having the same height as the magnet mounting portion 42 of the yoke tube portion 41 is attached to the outer peripheral surface 40a of the yoke tube portion 41. Attach to cover. And the plate | board thickness on the magnetic characteristic of the yoke 40 in the magnet mounting part 42 is increased.
[0004]
Although not shown in the drawings, conventionally, a thickening drawing method for increasing the thickness of the yoke tube portion including the magnet mounting portion has been used.
Furthermore, as shown in FIG. 11, the end of the yoke opposite to the bearing housing is provided with a flange 51, and an end cover 60 through which the rotating shaft passes is mounted.
[0005]
[Problems to be solved by the invention]
By the way, in the method shown in FIG. 10, the plate thickness of the magnet mounting portion 42 can be increased to twice or more than the plate thickness in terms of magnetic characteristics, but the yoke 40 is made of two parts and has a large number of parts. At the same time, it was necessary to assemble two parts, which led to a cost increase of the motor and became a problem. In addition, if the manufacturing accuracy of the two parts is poor, a gap is formed between the two parts, which makes it difficult to paint.
[0006]
On the other hand, in the thickening drawing method that solves the problem, the flange portion at the opening end becomes thicker by the compression process many times, and the portion where the end cover is attached becomes thicker from the inner circumference of the yoke as the plate thickness increases. A big sagging occurs over the time. Therefore, as a method of securing the fitting surface with the end cover, there are methods of lengthening the fitting part of the end cover and cutting, but there are problems that the coaxial accuracy is deteriorated and the cost is increased. there were.
[0007]
The present invention has been made to solve the above-described problems, and can be easily reduced in weight, reducing the manufacturing cost, and improving the coaxial accuracy of the yoke and the end cover by a simple method. An object of the present invention is to provide a yoke for a rotating electrical machine and a method for manufacturing the same.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention described in claim 1 includes a cylindrical portion (11) and a bottom portion (12) formed by drawing a plate-shaped material (W0), and the cylindrical portion (11) and Before forming the bottom portion (12), the bearing housing portion forming portion (19a) of the plate-like material (W0) is formed to be thinly formed, and the bearing housing portion forming portion (19a) is formed by a later forming process. bearing accommodating portion (16) made of Te, with a stepped portion for the end cover mounted to the bent portion (50) of the flange portion formed on the open end (51) (52) of said tubular portion (11), wherein The bottom part (12) including the bearing housing part (16) is formed so that its plate thickness is thinner than the plate thickness of the magnet mounting part (13) for mounting the magnet (M) on the inner surface of the cylindrical part (11). It is a summary.
[0009]
The invention according to claim 2 is in the course of molding the cylindrical portion (11) and the bottom portion (12) formed by drawing the plate-shaped material (W0), and the cylindrical portion (11) and the bottom portion (12). A bearing housing portion (16) formed by forming a bearing housing portion forming portion (19a) of a plate-like material (W0) into a thin wall and molding the bearing housing portion forming portion (19a) in a later molding process; A bent portion (50) of the flange portion (51) formed at the open end of the cylindrical portion (11) is provided with a step portion (52) for attaching an end cover, and includes a bottom portion including the bearing housing portion (16). The gist of (12) is that the plate thickness is formed thinner than the plate thickness of the magnet mounting portion (13) for mounting the magnet (M) on the inner surface of the cylindrical portion (11) .
[0010]
The invention according to claim 3 is formed into a bottomed cylindrical shape having one end opened by pressing the plate-shaped material (W0) in multiple stages, and a magnet (M) is formed on the inner surface of the cylindrical portion (11). A magnet mounting part (13) for mounting is provided, a bearing housing part (16) is provided in the center of the bottom part (12), and the bearing housing part (16) is thinner than the magnet mounting part (13). A method of manufacturing an electric yoke,
The plate-shaped material (W0) has a bottomed cylindrical shape having a tube portion forming portion (18) to be formed on the tube portion (11) and a bottom portion forming portion (19) to be formed on the bottom portion (12). A drawing process for drawing the first yoke coarse material (W1) and the first yoke coarse material (W1) in the same direction as the drawing direction in the drawing process, the bearing housing portion (16 ) And forming the second yoke coarse material (W2) into the second yoke coarse material (W2) in which the bearing housing portion forming portion (19a) is formed thin. A boss shaping step for forming a boss on a third yoke coarse material (W3) in which a concave portion (17) serving as the bearing accommodating portion (16) is formed in the bearing accommodating portion forming portion (19a), and the cylinder at the final stage of processing Bent part of the flange part (51) formed at the open end of the part (11) And a stepped portion forming process of forming a stepped portion for the end cover mounted (52) to 50), said bottom comprising a bearing housing portion (16) (12), the plate thickness is the tubular portion (11) The gist is that the inner surface of the magnet is formed thinner than the thickness of the magnet mounting portion (13) for mounting the magnet (M) .
[0011]
(Function)
According to the first to third aspects of the present invention, the yoke of the rotating device can be easily reduced in weight by forming the other portions except the magnet mounting portion to be thin, and the bearing housing portion forming portion can be more easily thinned. It is molded and the coaxial accuracy between the yoke and the end cover can be easily maintained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment in which the present invention is embodied in a motor as a rotating electrical machine will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the motor yoke of this embodiment. FIG. 2 is a cross-sectional view of a plate-like material for forming a motor yoke.
[0013]
As shown in FIG. 1, a motor yoke (hereinafter simply referred to as a yoke) 10 of this embodiment is formed in a bottomed cylindrical shape and includes a cylindrical portion 11 and a bottom portion 12.
The cylindrical portion 11 includes a magnet mounting portion 13 formed to be thick, an opening portion 14 formed to be thin, and a shoulder portion 15 formed thinly between the magnet mounting portion 13 and the bottom portion 12. ing. The bottom portion 12 has a bulge shape, and a bearing housing portion 16 is provided at the center. The bottom portion 12 is formed to be thin, and the thickness thereof is substantially the same as the thickness of the opening portion 14 and the shoulder portion 15. In this embodiment, both of the thicknesses of the magnet mounting portion 13 are approximately half (1/2). ).
[0014]
In the present embodiment, the magnet mounting portion 13 has a slightly longer axial length than the axial length of the magnet M (shown by a two-dot chain line in FIG. 1) mounted on the inner peripheral surface of the cylindrical portion 11. It is formed to become.
[0015]
The yoke 10 of this embodiment is formed by pressing a plate-shaped material W0 made of iron shown in FIG. 2 in multiple stages (six forming processes). The plate-like material W0 has a plate thickness t0 set to be substantially the same as the plate thickness of the magnet mounting portion 13.
[0016]
Hereinafter, the manufacturing method which shape | molds the yoke 10 with the plate-shaped raw material W0 is demonstrated according to FIGS.
"Overhang forming process"
In this molding step, as shown in FIG. 3, the plate material W0 is sandwiched between the holder 21 and the first cushion plate 22a with a clamping force stronger than the normal level. Next, the sandwiched plate-like material W0 is further sandwiched by the second die 26, and the first punch is directed in the same direction (upper direction shown in FIG. 3) as the drawing direction of a predetermined post-process (drawing). 27, the first yoke coarse material W1 is stretched and formed. As a result, the bearing housing portion forming portion 19a of the first yoke coarse material W1 is thinned (thickened) to the thickness t1.
[0017]
"Drawing process"
Next, the second die 26 and the overhanging punch 27 are extracted, and as shown in FIG. 4, the first yoke coarse material W1 is sandwiched between the holder 21 and the first cushion plate 22a with a normal level of clamping force, The second yoke coarse material W2 is drawn by the second punch 23 in a predetermined drawing direction (upward direction shown in FIG. 4). Thereby, the cylindrical portion forming portion 18 and the cylindrical portion forming portion 18 having the same thickness as the thickness t0 of the plate-like material W0 are formed, and the bearing accommodating portion forming portion 19a has a thickness t2 (<t1). Further thinning (thickening).
[0018]
Subsequently, as shown in FIG. 5, the second yoke coarse material W2 is sandwiched between the holder 21 and the first cushion plate 22a with a clamping force stronger than a normal level. Then, the sandwiched second yoke coarse material W2 is boss-shaped into the third yoke coarse material W3 by the boss shaping die 28 as the second die and the boss shaping punch 29 as the third punch. At the center of the boss shaping punch 29, a convex portion 29a having an outer dimension corresponding to the inner dimension of the bearing accommodating portion 16 is provided. By this boss shaping, the bottom portion forming portion 19 of the third yoke coarse material W3 is formed into a bulge shape and is thinned (thickened) to a thickness t3, and the bottom forming portion 19 has a thickness t4. A concave portion 17 to be the bearing housing portion 16 is formed. The thickness t3 and the thickness t4 may be set to be the same.
[0019]
"Body drawing process"
Thereafter, the boss shaping die 28 and the boss shaping punch 29 are extracted, and as shown in FIG. 6, the fourth yoke coarse material W4 is sandwiched between the fourth punch 30 and the knockout 31, and then the holder 21 and the first The cushion plate 22a is extracted. Then, a cylindrical body drawing die as a third die in a state in which the fourth yoke coarse material W4 is strongly sandwiched between the second cushion plate 22b, the fourth punch 30 and the first knockout 31. At 32, the fourth yoke coarse material W4 is drawn from the outer periphery. The fourth punch 30 includes a cylindrical portion 30a having an outer diameter slightly larger than the inner diameter of the cylindrical portion 11, and a convex portion 30b formed at the center of the tip of the cylindrical portion 30a and having the same outer dimensions as the convex portion 29a. I have. And by this trunk | drum drawing, the said bottom part formation part 19 is shape | molded in the bottom part 12, and the said cylinder part formation part 18 is shape | molded in the cylinder part 11. FIG.
[0020]
"Crushing and shaping process"
Finally, the first knockout 31 is extracted, and as shown in FIG. 7, the fourth yoke coarse material W4 is sandwiched between the second knockout 33 and the third cushion plate 22c, and the fourth punch 30 is inserted. And the body drawing die 32 is extracted. The second knockout 33 is smaller than the outer diameter of the first knockout 31 and has the same outer diameter as the outer diameter of the shoulder portion 15. Then, the fourth yoke coarse material W4 sandwiched as described above is deformed into a fifth yoke coarse material W5 by the fifth punch 34 and the fourth die 35. The fifth punch 34 includes a large diameter portion 34a having the same outer diameter as the inner diameter of the opening portion 14, a small diameter portion 34b having the same outer diameter as the inner diameters of the magnet mounting portion 13 and the shoulder portion 15, and the convex portion. And a convex portion 34c having the same outer dimensions as the portion 29a. Further, the fourth die 35 has an inner surface formed in the outer shape of the cylindrical portion 11. Then, by this ironing shaping, the fifth yoke coarse material W5 has a bottomed portion having a cylindrical portion forming portion 18 having the same shape and size as the cylindrical portion 11 and a bottom portion forming portion 19 having the same shape and size as the bottom portion 12. Shape it into a cylinder. Note that the thickness t5 of the opening 14 may be set to be the same as the thickness t3 and the thickness t4. Then, as shown in FIG. 7, a step 52 is formed at the bent portion 50 between the tube portion and the flange portion 51 by the step forming portion 34c of the fifth punch 34 in the final process of drawing. A plurality of the step portions 52 are formed as shown in FIG. FIG. 8 is a view seen from the opening side of the yoke, that is, from the direction of arrow A in FIG. Of course, the stepped portions 52 may all be formed continuously on the circumference. Further, the shape of the stepped portion 52 is not limited, and any shape may be used as long as the end cover 60 can be fitted into a substantially rectangular shape or semicircular shape. The end cover 60 is also formed with a projection (not shown) according to this shape, and is fitted to the stepped portion 52 to prevent rotation and positioning. Although the number of the stepped portions 52 is four in the embodiment, the number of the stepped portions is not limited as long as it is plural.
[0021]
In the present embodiment, the plate-shaped material W0 is stretched so that the bearing housing portion forming portion 19a is formed thin, and then the drawing forming processing for forming the tube portion forming portion 18 and the bottom portion forming portion 19 is performed. I did it. According to this, the wall thickness of the bearing accommodating part formation part 19a can be reduced more easily.
[0022]
In addition, you may change embodiment of this invention as follows.
O You may implement the shaping | molding process which shape | molds the bearing accommodating part formation part 19a of the plate-shaped raw material W0 thinly as shown in FIG. This sandwiches the plate material W0 between the holder 21 and the first cushion plate 22a with a clamping force stronger than the normal level. Next, the sandwiched plate-shaped material W0 is further sandwiched by the first die 24, and the direction (the lower side shown in FIG. 3) opposite to the drawing direction (the upper side shown in FIG. 3) in the predetermined post-process (drawing) ) To the first yoke coarse material W1 by the reverse overhang punch 25.
[0023]
O You may carry out by forming the cross section of the cylinder part 11 in shapes other than circular ring shape, for example, substantially square ring shape, elliptical ring shape, etc., for example.
The axial length of the magnet mounting portion 13 may be the same as the axial length of the magnet M mounted on the inner peripheral surface of the cylindrical portion 11 corresponding to the magnet mounting portion 13.
[0024]
The bottom 12 may be formed into a two-stage bulge shape.
The present invention may be embodied in other rotating electric machines other than motors.
-The step part 52 formed in the bending part 50 of the flange part 51 may be formed in a perimeter, and may be provided in multiple parts. The shape of the stepped portion may be a substantially semicircular shape or a quadrangular shape.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a motor yoke of the present invention.
FIG. 2 is a cross-sectional view of a plate material for forming a motor yoke.
FIG. 3 is a cross-sectional view illustrating an overhang forming process for forming a motor yoke.
FIG. 4 is a cross-sectional view showing a drawing process for forming a motor yoke.
FIG. 5 is a cross-sectional view showing a boss shaping process for forming a motor yoke.
FIG. 6 is a cross-sectional view showing a body drawing process for forming a motor yoke.
FIG. 7 is a cross-sectional view showing an iron shaping process for forming a motor yoke.
FIG. 8 is a diagram viewed from the direction A in FIG.
FIG. 9 is a cross-sectional view showing another example of the overhang forming step.
FIG. 10 is a cross-sectional view of a main part of a conventional motor yoke.
FIG. 11 is a cross-sectional view of a main part of a conventional motor yoke with an end cover attached.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Motor yoke, 11 ... Tube part, 12 ... Bottom part, 13 ... Magnet mounting part, 14 ... Opening part, 15 ... Shoulder part, 17 ... Recessed part, 18 ... Tube part formation part, 19 ... Bottom part formation part, 19a ... Bearing Storage part forming part, 50 ... bent part, 51 ... flange part, 52 ... step part, W0 ... plate-like material, t0 ... plate thickness of plate-like material W0, W1 ... first yoke coarse material, W2 ... second York coarse material, W3 ... 3rd yoke coarse material, W4 ... 4th yoke coarse material, W5 ... 5th yoke coarse material.

Claims (3)

A cylindrical portion (11) and a bottom portion (12) formed by drawing a plate-like material (W0);
Before forming the cylindrical part (11) and the bottom part (12), the bearing accommodating part forming part (19a) of the plate-like material (W0) is thinly formed and processed, and the bearing accommodating part forming part is formed later. A bearing housing (16) formed by molding (19a);
The bent portion (50) of the flange portion (51) formed at the open end of the cylindrical portion (11) is provided with a step portion (52) for attaching an end cover,
The bottom portion (12) including the bearing housing portion (16) has a thickness that is thinner than the thickness of the magnet mounting portion (13) for mounting the magnet (M) on the inner surface of the cylindrical portion (11). yoke of a rotary electric machine, characterized in that it is formed. A cylindrical portion (11) and a bottom portion (12) formed by drawing a plate-like material (W0);
During the molding of the cylindrical portion (11) and the bottom portion (12), the bearing housing portion forming portion (19a) of the plate-like material (W0) is formed by being thinly formed, and the bearing housing portion forming portion is formed later. A step for attaching an end cover to a bearing housing portion (16) formed by molding (19a) and a bent portion (50) of a flange portion (51) formed at an open end portion of the cylindrical portion (11) The bottom portion (12) including the bearing housing portion (16) includes a magnet mounting portion (13) for mounting the magnet (M) on the inner surface of the cylindrical portion (11). A yoke for a rotating electrical machine, characterized in that the yoke is formed thinner than the thickness . By pressing the plate-like material (W0) in multiple stages, it is formed into a bottomed cylindrical shape with one end open, and a magnet mounting portion (13) for mounting the magnet (M) on the inner surface of the cylindrical portion (11). ), A bearing housing part (16) is provided in the center of the bottom part (12), and the bearing housing part (16) is thinner than the magnet mounting part (13). ,
The plate-shaped material (W0) has a bottomed cylindrical shape having a tube portion forming portion (18) to be formed on the tube portion (11) and a bottom portion forming portion (19) to be formed on the bottom portion (12). A drawing process for drawing the first yoke coarse material (W1);
A bearing housing portion forming portion (19a) is formed thin to form the first yoke coarse material (W1) in the bearing housing portion (16) in the same direction as the drawing direction in the drawing process. An overhang forming step of overhang forming the second yoke coarse material (W2);
The second yoke coarse material (W2) is bossed on the third yoke coarse material (W3) in which the concave portion (17) serving as the bearing accommodating portion (16) is formed in the bearing accommodating portion forming portion (19a). A boss shaping process for shaping,
A step forming step of forming a step portion (52) for mounting the end cover on the bent portion (50) of the flange portion (51) formed at the open end of the cylindrical portion (11) at the end of processing; Prepared,
The bottom portion (12) including the bearing housing portion (16) has a thickness that is thinner than the thickness of the magnet mounting portion (13) for mounting the magnet (M) on the inner surface of the cylindrical portion (11). A method for manufacturing a yoke of a rotating electrical machine, wherein the yoke is formed .

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