JP2006025533A - Caulking structure of laminated iron core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the caulking structure of a laminated iron core for improving a stability and the caulking strength of a lamination, minimizing the interlayer gap between laminated iron core pieces, and manufacturing the laminated iron core with high occupancy ratio, even if a thin plate material is used. <P>SOLUTION: A caulking protrusion 11 is provided, and a plurality of the iron core pieces 10 are caulked and laminated via the caulking protrusion 11 in the caulking structure of the laminated iron core piece 10. The caulking protrusion 11 comprises a protrusion 12, formed on the back side of the iron core piece 10 and a recess 13 formed on the front side right over the protrusion 12. Inner and outer widths of the engagement cross section of the caulking protrusion 11 are made gradually narrow, starting from the front side to the back side of the iron core piece 10. If the maximum of the inner width of the engagement cross section is (a), the minimum of the inner width is b, the minimum of the outer width is c and the maximum of the outer width is d, a relationship d>a>c>b is satisfied. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a caulking structure of a laminated iron core manufactured by laminating a plurality of iron core pieces.

Conventionally, as shown in FIGS. 5 to 7, each core piece 90 is caulked and laminated through a caulking projection 91 provided on each of the plurality of core pieces 90 to manufacture a laminated core.
The caulking projection 91 is composed of a convex portion 92 formed on the back surface side of the iron core piece 90 and a concave portion 93 formed immediately above the convex portion 92, and the inner surface of the concave portion 93 and the outer surface of the convex portion 92. When the side surface is straight, that is, when the engagement cross section of the caulking protrusion 91 (the cut surface in the radial direction of the iron core piece 90, that is, the cross section taken along the arrow YY in FIG. 5) is seen, as shown in FIG. The lines indicating the side surfaces of the portion 92 and the recess 93 are vertical. The convex portion 92 is provided with a fitting allowance for fitting into the concave portion 93.
For this reason, when the convex portion 92 is sequentially fitted and crimped to the concave portion 93 of another iron core piece 90, it is difficult to align the convex portion 92, and the convex portion 92 is deformed before being inserted into the concave portion 93. There was a problem that it could not be pushed into the recesses 93 of the other iron core pieces 90 so as not to occur.
In addition, as described in Patent Document 1, a laminated iron core has also been proposed in which an iron core piece having a taper shape is caulked and laminated so that convex portions (protruding portions) constituting the caulking protrusion are narrowed in the protruding direction. Yes.

Japanese Utility Model Publication No. 57-95045

However, even in this laminated iron core, the outer side surface of the convex part and the inner side surface of the concave part have a straight shape. Therefore, if the convex part on the back side is not deformed when the iron core pieces are laminated, There is a problem that it is difficult to enter the recess, and this makes it impossible to minimize the gap between the core pieces.
In addition, since the outer surface of the convex portion of the caulking projection and the inner surface of the concave portion are straight, the fitting allowance when caulking and laminating a plurality of core pieces cannot be increased more than the current situation. There was also a problem that the caulking strength could not be further improved.

The present invention has been made in view of such circumstances, can improve the stability of the lamination and the caulking strength, can minimize the interlaminar gap of the laminated iron core pieces, and has a good space factor even when a thin plate material is used. An object of the present invention is to provide a caulking structure of a laminated core capable of manufacturing an iron core.

The caulking structure of the laminated iron core according to claim 1, wherein the caulking structure of the laminated iron core is formed by caulking and laminating each of the iron core pieces via caulking protrusions provided respectively on the plurality of iron core pieces.
The caulking protrusion is composed of a convex portion formed on the back surface side of the iron core piece and a concave portion formed on the front surface side immediately above the convex portion, and the engagement cross section of the caulking protrusion includes The width is gradually narrowed from the front surface side to the back surface side of the iron core piece, and the outer width is gradually narrowed from the front surface side to the back surface side of the iron core piece, the maximum value of the inner width of the engagement cross section Is a, the minimum value is b, the minimum value of the outer width is c, and the maximum value is d, the relationship d>a>c> b is satisfied.
In the caulking structure of the laminated iron core according to claim 1, the shape of the caulking projection is, for example, a rectangle (rectangle or square) or a circle in plan view.
Here, the inner width and the outer width of the engagement cross section of the caulking projection are gradually narrowed from the front surface side to the back surface side of the iron core piece. The shape of the convex part and the concave part is the surface of the iron core piece. This means that the taper is tapered from the side to the back side.
Also, the shape of the recess is such that the maximum inner width of the engagement cross section of the caulking projection is smaller than the minimum outer width so that the protrusion can be easily inserted into the recess and a fitting allowance for fitting is formed. It is large and its minimum inner width is smaller than the minimum outer width.

The caulking structure of the laminated iron core according to claim 2, wherein the caulking structure of the laminated iron core is formed by caulking and laminating each of the iron core pieces via caulking projections respectively provided on a plurality of iron core pieces.
The caulking protrusion is composed of a convex portion formed on the back surface side of the iron core piece and a concave portion formed on the front surface side immediately above the convex portion, and the engagement cross section of the caulking protrusion includes The width is gradually narrowed from the front side to the back side of the iron core piece, and the outer width is substantially the same from the front side to the back side of the iron core piece. When the maximum value of the width is a, the minimum value is b, the leading end value of the outer width is c, and the base end value is d, the relationship of a ≧ c (= d)> b is satisfied.
In the caulking structure of the laminated iron core according to claim 2, the shape of the caulking projection is, for example, rectangular or circular in plan view.
Here, the outer width of the engagement cross section of the caulking projection is substantially the same from the front surface side to the back surface side of the iron core piece, that the outer surface of the convex portion has a straight shape. Means.
The shape of the concave portion is a tapered shape that tapers from the front surface side to the back surface side of the iron core piece so that a fitting allowance for fitting the convex portion into the concave portion is formed (with an inverted trapezoidal engagement cross section). It has become.

The caulking structure of the laminated core according to claim 3, wherein the caulking structure of the laminated iron core is formed by caulking and laminating each of the iron core pieces via caulking protrusions respectively provided on a plurality of iron core pieces.
The caulking protrusion is composed of a convex portion formed on the back surface side of the iron core piece and a concave portion formed on the front surface side immediately above the convex portion, and the engagement cross section of the caulking protrusion includes The width is substantially the same from the front surface side to the back surface side of the iron core piece, and the outer width is gradually narrowed from the front surface side to the back surface side of the iron core piece. When the upper end value of the width is a, the lower end value is b, the minimum value of the outer width is c, and the maximum value is d, the relationship d> a (= b) ≧ c is satisfied.
4. The caulking structure of the laminated iron core according to claim 3, wherein the caulking projection has a rectangular or circular shape in plan view.
Here, the fact that the outer width of the engagement cross section of the caulking projection is gradually narrowed from the front surface side to the back surface side of the iron core piece means that the shape of the convex portion is from the front surface side to the back surface side of the iron core piece. This means that the taper is tapered.
In addition, the shape of the concave portion is smaller (inner width) than the maximum outer width of the engagement cross section of the caulking projection so that a fitting margin for fitting the convex portion into the concave portion is formed. .

The caulking structure of the laminated iron core according to claim 4 is the caulking structure of the laminated iron core according to claims 1 to 3, wherein the side wall portion constituted by the convex side surface and the concave side surface of the caulking projection is a meat portion thereof. The thickness is thinner than the thickness of the iron core piece.
In the caulking structure of the laminated iron core according to claim 4, the thickness of the side wall corresponds to the shortest distance between the side surface of the convex portion and the side surface of the concave portion. Here, it is preferable that the thickness of the side wall portion is, for example, about 1% or more and 20% or less thinner than the thickness of the core piece.

The caulking structure of the laminated core according to claim 1 and claim 4 dependent thereon has a maximum inner width a, a minimum inner width b, a minimum outer width c, and a maximum outer width of the engagement cross section of the caulking projection. Since d satisfies the relationship of a> c, it is easy to align the positions of the concave portion and the convex portion of the iron core piece, and the convex portion before the convex portion is inserted into the concave portion as in the prior art. Without being deformed, it can be pushed into the recesses of other iron core pieces. Further, since the relationship of d> a and c> b is satisfied, the fitting allowance is increased as compared with the case where the outer side surface of the convex portion and the inner side surface of the concave portion have a straight shape as in the prior art. it can.
Thereby, the stability of the lamination and the improvement of the caulking strength can be achieved, the gap between the laminated iron core pieces can be minimized, and a laminated iron core having a good space factor can be provided even when a thin plate material is used.

The caulking structure of the laminated core according to claim 2 and claim 4 dependent thereon, wherein the maximum inner width of the engagement cross section of the caulking projection is a, the minimum inner width is b, the outer end width is c, and the outer end of the base end When the width is d, the relationship of a ≧ c, preferably the relationship of a> c is satisfied, so that the positions of the concave portion and the convex portion of the iron core piece can be easily aligned. Further, since the relationship of c (= d)> b is satisfied, the fitting allowance is increased as compared with the case where the outer side surface of the convex portion and the inner side surface of the concave portion have a straight shape as in the prior art. And the caulking strength can be further improved.

The caulking structure of the laminated iron core according to claim 3 and claim 4 dependent thereon has an upper end inner width a, a lower end inner width b, a minimum outer width c, and a maximum outer width of the engagement cross section of the caulking projection. When d is d, the relationship of a ≧ c, preferably the relationship of a> c, is satisfied, so that the positions of the concave portion and the convex portion of the iron core piece can be easily aligned. Further, since the relationship of d> a (= b) is satisfied, the fitting allowance is increased as compared with the case where the outer side surface of the convex portion and the inner side surface of the concave portion have a straight shape as in the prior art. And the caulking strength can be further improved.

Particularly, in the caulking structure of the laminated iron core according to claim 4, since the thickness of the side wall portion of the caulking projection is made thinner than the thickness of the iron core piece, the interlayer gap between the laminated iron core pieces is minimized. Therefore, it is possible to provide a laminated iron core capable of further improving electrical characteristics.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIGS. 1A and 1B are a side sectional view of an iron core piece to which the caulking structure of the laminated iron core according to the first embodiment of the present invention is applied, an explanatory view showing a laminated state, and FIG. FIGS. 3A and 3B are side sectional views of iron core pieces to which the caulking structure of the laminated iron core according to the second embodiment of the present invention is applied, an explanatory diagram showing a laminated state, and FIGS. Is an explanatory view showing a manufacturing method of the core piece, (C) is an explanatory view showing a laminated state of the manufactured core pieces, FIG. 4 (A) is an explanatory view showing another manufacturing method of the core pieces, and (B) is It is explanatory drawing which shows the lamination | stacking state of the manufactured iron core piece.

As shown in FIGS. 1 (A) and 1 (B), the laminated iron core caulking structure according to the first embodiment of the present invention is provided with caulking protrusions 11 provided on a plurality of iron core pieces 10, respectively. A caulking structure in which each iron core piece 10 is caulked and laminated to improve the stability of the lamination and the caulking strength, and the gap between the laminated iron core pieces 10 can be minimized so that a laminated iron core having a high space factor can be manufactured. It is to make. The plurality of core pieces 10 are punched from, for example, an electromagnetic steel plate (an example of a magnetic iron plate) having a thickness of about 0.5 mm or less. This will be described in detail below.

As shown in FIG. 1A, the caulking projection 11 is composed of a convex portion 12 formed on the back surface side of the iron core piece 10 and a concave portion 13 formed on the surface side immediately above the convex portion 12. ing. The convex portion 12 has a tapered shape gradually narrowing from the front surface side to the back surface side of the iron core piece 10, that is, the outer width of the engagement cross section of the caulking projection 11 is from the front surface side to the back surface side of the iron core piece 10. It gradually narrows over time. Moreover, since the convex part 12 of the iron core piece 10 is inserted and fitted into the concave part 13 of the other iron core piece 10 on which the iron core piece 10 is laminated, the inner width of the engagement cross section of the caulking projection 11 is reduced. The core piece 10 is gradually narrowed from the front side to the back side.

The engagement cross section of the caulking protrusion 11 is such that the maximum inner width of the recess 13 on the surface side of the core piece 10 (the inner width of the upper end of the recess 13) is a, and the minimum inner width of the recess 13 (the inner width of the bottom of the recess 13). ) Is b, the minimum outer width of the convex portion 12 on the back surface side of the iron core piece 10 (the outer width of the tip portion of the convex portion 12) is c, and the maximum outer width of the convex portion 12 (of the base end portion of the convex portion 12) When the outer width is d, the relationship d>a>c> b is established.
The shape of the inner surface of the recess formed on the surface side of the core piece is straight, that is, the inner width of the engagement cross section of the caulking projection is substantially the same from the front side to the back side of the core piece. In this case, assuming that the upper end value of the inner width of the engagement cross section of the caulking projection is a and the lower end value of the inner width is b, the relationship of d> a (= b) ≧ c is satisfied. Is possible.

Here, an explanation will be given of how large the convex portion 12 can be with respect to the concave portion 13 of the caulking projection 11 so that a laminated core with stable quality can be manufactured without detaching the laminated core pieces 10. To do.
When the inclination angle of the convex side surface 14 of the caulking protrusion 11 with respect to the back surface of the iron core piece 10 and the inclination angle of the concave side surface 15 of the caulking protrusion 11 with respect to the surface of the iron core piece 10 are substantially the same angle θ1, The maximum static frictional force F of the laminated core pieces 10 adjacent to each other is represented by the relationship F = μN = tan θ1 · N. Here, μ (= tan θ1) is a coefficient of static friction, and N is a normal drag.

At this time, in order to prevent the caulking of the laminated iron core pieces 10 from being removed, the maximum static frictional force F is greater than the force applied in the caulking direction (vertical direction in the present embodiment). In other words, the inclination angle θ1 of the convex side surface 14 and the concave side surface 15 is, for example, 70 degrees or more and less than 90 degrees, preferably 80 degrees or more and less than 90 degrees, and more preferably 85 degrees so that the coefficient of static friction μ increases. It is set within the range of less than 90 degrees.
In addition, although the case where the inclination angle θ1 of the convex side surface 14 and the concave side surface 15 is the same has been described here, the difference between the angles is, for example, within a range of about 5 degrees (preferably 3 degrees). May be different.

Moreover, when the convex part 12 is fitted to the concave part 13, the size of the outer width and the inner width of the engagement cross section is one place (one side) of the convex part 12 and the concave part 13 at the same position in the thickness direction of the iron core piece 10. It is preferable that the fitting allowance can be adjusted within a range of, for example, more than 0 and 15 μm or less (30 μm or less in the entire engagement section). Therefore, at the same position in the thickness direction of the iron core piece 10, the outer width of the engagement cross section is increased in the range of 30 μm or less from the inner width. The fitting allowance is determined in consideration of the material (for example, elastic modulus) of the iron core piece, and is preferably within the elastic deformation region of the material, for example, but may be within the plastic deformation region.
The depth of the recess 13 is preferably 50% or more (upper limit is, for example, 110% or less) of the thickness of the iron core piece 10 if sufficient caulking strength is obtained.

The caulking projection 11 has a rectangular shape in plan view, and has a cross-sectional shape that satisfies the above-described conditions in both the circumferential direction and the radial direction of the iron core piece 10. Conventionally, there are cases where the outer surface of the convex portion of the iron core piece and the inner surface of the concave portion are straight, that is, the engagement cross section of the caulking projection is vertical, which causes the various problems described above. Therefore, it is also possible to make only this engagement cross section into the above-mentioned shape and make other cross sections into a conventional tapered shape.
As shown in FIG. 1 (B), the caulking projections 11 shown above are formed on a magnetic steel sheet using a die and punch of a press mold, and a plurality of core pieces 10 punched from the magnetic steel sheet are formed. The laminated iron core is manufactured by sequentially caulking and laminating.

Subsequently, a caulking structure of the laminated core according to the second embodiment of the present invention will be described.
As shown in FIGS. 2A and 2B, the caulking projection 20 includes a convex portion 22 formed on the back surface side of the iron core piece 21 and a concave portion 23 formed on the surface side immediately above the convex portion 22. It consists of and.
The outer width of the engagement cross section of the caulking protrusion 20 is substantially the same from the front surface side to the back surface side of the iron core piece 21, that is, the outer surface of the convex portion 22 has a straight shape. Moreover, since the convex part 22 of the iron core piece 21 is inserted and fitted in the concave part 23 of the other iron core piece 21 on which the iron core piece 21 is laminated, the shape of the concave part 23 is the surface side of the iron core piece 21. The taper is tapered from the back side to the back side (engaged cross section is inverted trapezoidal).

Here, the engagement cross section of the caulking projection 20 is such that the maximum inner width of the recess 23 on the surface side of the core piece 21 (the inner width of the upper end of the recess 23) is a, and the minimum inner width of the recess 23 (the bottom of the recess 23). (Inner width) is b, and the tip value of the outer width of the convex portion 22 on the back side of the iron core piece 21 is c, and the base value of the outer width is d, a ≧ c (= d)> b A relationship is established.
In consideration of the above-described conditions, the inclination angle θ2 of the concave side surface 24 is, for example, in the range of 70 degrees to less than 90 degrees, preferably 80 degrees to less than 90 degrees, and more preferably 85 degrees to less than 90 degrees. Set. In addition, regarding the fitting allowance, when the convex portion 22 is fitted into the concave portion 23 in consideration of the above-described conditions, one location (one side) of the convex portion 22 and the concave portion 23 at the same position in the thickness direction of the iron core piece 21. It is preferable that the fitting allowance can be adjusted within a range of, for example, more than 0 and 15 μm or less (30 μm or less for the entire engagement cross section).

In addition, it is preferable to perform the following processing when molding the caulking projections 11 and 20 of the iron core pieces 10 and 21 described above. Since this processing can be applied to each of the core pieces 10 and 21 described above and another core piece that satisfies the above-described conditions, the following description will be given with different reference numerals.
First, as shown in FIG. 3A, crushing is performed on the electromagnetic steel sheet 32 using a crushing punch 30 and a crushing die 31. Thereby, a thin portion 37 that is thinner than the thickness of the electromagnetic steel plate 32 is formed in a portion corresponding to the side wall portion (inclined portion) 36 formed by the concave side surface 34 and the convex side surface 35 of the caulking projection 33. It is formed. In addition, it is preferable to make the thickness of the thin part 37 into about 1% or more and 20% or less of the thickness of the iron core piece 38 manufactured from the electromagnetic steel plate 32.

Subsequently, as shown in FIG. 3 (B), a bend punch (bending punch) 39 and a bend die (bending die) 40 are used for the thin portion 37 subjected to the thin wall processing, A caulking projection 33 having a shape satisfying the above relationship is formed. At this time, the bottom surface of the caulking projection 33 is positioned by a knock pin (dwell pin) 41 provided so as to be movable up and down by a spring (not shown).
The thickness of the iron core piece 38 manufactured in this way is the same as the thickness of the side wall portion 36 of the caulking projection 33 of the laminated iron core pieces 38 (the surplus thickness more than the thickness that can be used for the fitting allowance). It has been crushed beforehand. For this reason, as shown in FIG. 3 (C), when the convex portions 42 of the core pieces 38 are inserted and fitted into the concave portions 43 of the other core pieces 38 and the core pieces 38 are laminated, It is difficult to form a gap, and the gap can be minimized. For example, quality confirmation of a laminated iron core after manufacture can be facilitated.

In addition, the following processing can be performed instead of the above processing.
First, as shown in FIG. 4 (A), a bending punch 44 and a bending die 45 are used to perform crushing and bending simultaneously on the electromagnetic steel sheet. Thereby, the thickness of the portion corresponding to the side wall portion (inclined portion) 49 formed by the concave side surface 47 and the convex side surface 48 of the caulking projection 46 is made thinner than the thickness of the iron core piece 50 to be manufactured. In this case, a knock pin (not shown) is provided around the bend die 45, for example.
The thickness of the iron core piece 50 manufactured in this way is crushed in advance by the amount corresponding to the side wall portion 49 of the caulking projection 46. For this reason, as shown in FIG. 4 (B), the convex portions 51 of the core pieces 50 are inserted into and fitted into the concave portions 52 of the other core pieces 50, and the respective core pieces 50 are stacked, so that This gap is difficult to make, and the gap can be minimized. Further, since the crushing process and the bending process can be performed in one process, the manufacturing time can be shortened.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the caulking structure of the laminated iron core of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Moreover, in the said embodiment, although the case where the shape of the crimping protrusion became a rectangle by planar view was demonstrated, you may become square or circular by planar view.

(A), (B) is the sectional side view of the core piece which applies the crimping structure of the laminated core which concerns on the 1st Embodiment of this invention, respectively, and explanatory drawing which shows a lamination | stacking state. (A), (B) is the sectional side view of the iron core piece which applies the crimping structure of the laminated iron core which concerns on the 2nd Embodiment of this invention, respectively, and explanatory drawing which shows a lamination | stacking state. (A), (B) is explanatory drawing which shows the manufacturing method of an iron core piece, respectively, (C) is explanatory drawing which shows the lamination | stacking state of the manufactured iron core piece. (A) is explanatory drawing which shows the other manufacturing method of an iron core piece, (B) is explanatory drawing which shows the lamination | stacking state of the manufactured iron core piece. It is a top view of the iron core piece which concerns on a prior art example. It is XX arrow sectional drawing of FIG. FIG. 6 is a cross-sectional view taken along line YY in FIG. 5.

Explanation of symbols

10: iron core piece, 11: caulking projection, 12: convex portion, 13: concave portion, 14: convex side surface, 15: concave side surface, 20: caulking projection, 21: iron core piece, 22: convex portion, 23: concave portion 24: concave side surface, 30: crushing punch, 31: crushing die, 32: electromagnetic steel plate, 33: caulking projection, 34: concave side surface, 35: convex side surface, 36: side wall portion, 37: thin wall portion, 38: Iron core piece, 39: Bend punch, 40: Bend die, 41: Knock pin, 42: Convex portion, 43: Concavity, 44: Bend punch, 45: Bend die, 46: Caulking projection, 47: Concave side, 48: Convex side, 49: Side wall, 50: Iron core piece, 51: Convex, 52: Concave

Claims (4)

In the caulking structure of the laminated core in which each of the iron core pieces is caulked and laminated through the caulking protrusions provided on each of the iron core pieces,
The caulking protrusion is composed of a convex portion formed on the back surface side of the iron core piece and a concave portion formed on the front surface side immediately above the convex portion, and the engagement cross section of the caulking protrusion includes The width is gradually narrowed from the front side to the back side of the core piece, and the outer width is gradually narrowed from the front side to the back side of the core piece. And a minimum value is b, a minimum value of the outer width is c, and a maximum value is d. The caulking structure of the laminated iron core satisfies the relationship d>a>c> b. In the caulking structure of the laminated core in which each of the iron core pieces is caulked and laminated through the caulking protrusions provided on each of the iron core pieces,
The caulking protrusion is composed of a convex portion formed on the back surface side of the iron core piece and a concave portion formed on the front surface side immediately above the convex portion, and the engagement cross section of the caulking protrusion includes The width is gradually narrowed from the front side to the back side of the iron core piece, and the outer width is substantially the same from the front side to the back side of the iron core piece. When the maximum value of the width is a, the minimum value is b, the leading end value of the outer width is c, and the base end value is d, the relationship of a ≧ c (= d)> b is satisfied. Caulking structure of laminated iron core. In the caulking structure of the laminated core in which each of the iron core pieces is caulked and laminated through the caulking protrusions provided on each of the iron core pieces,
The caulking protrusion is composed of a convex portion formed on the back surface side of the iron core piece and a concave portion formed on the front surface side immediately above the convex portion, and the engagement cross section of the caulking protrusion includes The width is substantially the same from the front surface side to the back surface side of the iron core piece, and the outer width is gradually narrowed from the front surface side to the back surface side of the iron core piece. Lamination characterized by satisfying the relationship of d> a (= b) ≧ c, where a is the upper end value of the width, b is the lower end value, c is the minimum value of the outer width, and d is the maximum value of the outer width. Caulking structure of iron core. The caulking structure of the laminated core according to any one of claims 1 to 3, wherein a thickness of the side wall portion formed by the convex side surface and the concave side surface of the caulking projection is the core piece. A caulking structure of a laminated iron core characterized by being thinner than the plate thickness.

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