Laminated iron core and method for manufacturing the same

Abstract

A laminated iron core is a cylindrical laminated iron core formed by laminating a plurality of iron core sheets in the thickness direction, wherein the iron core sheet has a plate-shaped back yoke portion extending in the circumferential direction and a plurality of plate-shaped teeth extending radially inward from the back yoke portion. The iron core sheet and another iron core sheet laminated in the thickness direction are bonded via a solidified product of a two-component adhesive bonded to a bonded portion on a surface in the thickness direction. At least one of the iron core sheet and the other iron core sheet has either of two liquid agents constituting the two-component adhesive attached to at least a portion of an area surrounding the bonded portion when viewed from the thickness direction.

Description

Technical Field

[0001] The present invention relates to a laminated iron core and a method for manufacturing the laminated iron core. Background Art

[0002] It is known that there is a laminated core formed by laminating a plurality of iron core sheets formed into a circular ring shape by bending a strip-shaped steel plate extending in one direction into an arc shape. For example, a stator core is disclosed, which is composed of a ring-shaped linear core formed by bending a punched plate having a plurality of teeth protruding from one long side of a strip-shaped back yoke into an arc shape, and combining a plurality of the above-mentioned arc-shaped punched plates. In the stator core, the outer periphery of the linear core is fixed by laser welding (for example, Patent Document 1). [Prior art literature] [Patent Document]

[0003] Patent Document 1: Japanese Patent Application Publication No. 2005-143164 Summary of the invention

[0004] However, the method for manufacturing a laminated iron core in which a plurality of iron core sheets bent into an arc shape are stacked includes: a bending step of bending the steel plate; a stacking step of stacking the iron core sheets obtained by the bending step; and a welding step of welding the outer periphery of the stack obtained by the stacking step. Springback that returns to the state before bending occurs on the iron core sheets. Therefore, the shape of the stack needs to be maintained during the welding step. Therefore, there is a problem of complicated manufacturing process and reduced productivity. Therefore, a method for manufacturing a laminated iron core that can improve productivity is needed.

[0005] An object of the present invention is to provide a method for manufacturing a laminated iron core capable of improving the productivity of a laminated iron core in which a plurality of iron core sheets bent into arc shapes are laminated.

[0006] A laminated iron core according to one embodiment of the present invention is a cylindrical laminated iron core, which is formed by stacking a plurality of iron core sheets in the thickness direction, and the iron core sheets have: a plate-shaped back yoke portion extending in the circumferential direction; a plurality of plate-shaped teeth extending radially inward from the back yoke portion; and a slit extending radially outward from the end surface on the inner circumferential side between circumferentially adjacent teeth in the back yoke portion. The iron core sheet and another iron core sheet stacked in the thickness direction are bonded via a solidified product of a two-component adhesive bonded to a bonded portion on a surface in the thickness direction. At least one of the iron core sheet and the other iron core sheet has either of the two liquid agents constituting the two-component adhesive attached to at least a portion of the region surrounding the bonded portion when viewed from the thickness direction.

[0007] A method for manufacturing a laminated iron core according to one embodiment of the present invention is a method for manufacturing a cylindrical laminated iron core, wherein a plurality of iron core sheets are stacked in a thickness direction, and the iron core sheets have: a plate-shaped back yoke portion extending in a circumferential direction; a plurality of plate-shaped teeth extending radially inward from the back yoke portion; and a slit extending from an end surface on the inner circumferential side to a radially outward side between circumferentially adjacent teeth in the back yoke portion. The manufacturing method of the laminated iron core comprises: a punching process, in which a plate-shaped iron core forming part is formed by punching a steel plate, wherein the iron core forming part has a strip-shaped back yoke forming part, a plurality of teeth protruding from the back yoke forming part to one side in the width direction of the back yoke forming part, and a slit extending to the other side in the width direction between adjacent teeth in the back yoke forming part; a bending process, in which the gap of the slit is compressed for the iron core forming part formed in the punching process and the iron core forming part is bent into an arc shape when viewed from the thickness direction; a first coating process, in which a surface of the iron core forming part on one side in the thickness direction is coated with a coating agent. A first coating portion applies a first liquid of one of two liquids constituting a two-liquid adhesive that reacts and solidifies by contact; a second coating step applies a second liquid of the other of the two liquids to the second coating portion on the surface on the other side of the thickness direction of the iron core sheet forming portion; and an adhesive lamination step overlaps the iron core sheet forming portion bent into an arc shape by the bending step in a lamination direction, so that the first liquid applied on the surface on one side of the thickness direction by the first coating step is in contact with the second liquid applied on the surface on the other side of the thickness direction by the second coating step.

[0008] According to the present invention, it is possible to provide a method for manufacturing a laminated iron core capable of improving productivity in which a plurality of core sheets bent in an arc shape are laminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a perspective view showing a schematic structure of a laminated core according to the first embodiment. Figure 2 It is a plan view showing a schematic structure of a core sheet. Figure 3 It is a cross-sectional view of a laminated core and is a diagram for explaining a bonded portion. Figure 4 This is a diagram schematically showing a state in which another core sheet stacked in the thickness direction is removed and the core sheet is viewed in the thickness direction. Figure 5A This is a diagram for explaining a method of bonding objects stacked in a stacking direction using a honeymoon adhesive. Figure 5B This is a diagram for explaining a state in which objects stacked in a stacking direction are bonded to each other using a honeymoon adhesive. Figure 6 This is a flowchart showing the method for manufacturing the laminated iron core according to the first embodiment. Figure 7 This is a blanking diagram of a steel plate. Fig. 8A It is a diagram showing a schematic structure of one surface in the thickness direction of the core sheet forming portion. Figure 8B It is a diagram showing a schematic structure of the other surface in the thickness direction of the core sheet forming portion. Fig. 9 It is a diagram for explaining the relationship between the first coating step, the second coating step, and the bending step. Fig.10 This is a diagram for explaining a case where one of two liquid agents is applied to one of the core sheet forming portions adjacent to each other in the stacking direction, and the other of the two liquid agents is applied to the other of the core sheet forming portions to perform bonding. Fig.11 This is a diagram for explaining a schematic structure of a laminated core according to a modification of the first embodiment. Fig.12 It is a diagram for explaining the position of the bonded portion of the laminated core according to another embodiment. Fig.13 It is a diagram for explaining a position where one of two liquid agents adheres in a laminated iron core according to another embodiment. Fig.14 It is a diagram for explaining positions where two liquid agents adhere in a laminated core according to another embodiment. Fig.15 This is a diagram for explaining a method for manufacturing a laminated iron core according to another embodiment in which one of two liquid agents is applied to one of core sheet forming portions adjacent to each other in the lamination direction and the other of the two liquid agents is applied to the other of the core sheet forming portions. DETAILED DESCRIPTION

[0010] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same or equivalent parts in the drawings are marked with the same reference numerals, and their descriptions are not repeated. In addition, the dimensions of the components in each figure do not faithfully show the dimensions of the actual components and the dimensional ratios of the components.

[0011] In the following description, a direction parallel to the central axis P of the laminated core is referred to as an axial direction, a direction orthogonal to the central axis P is referred to as a radial direction, and a direction along an arc centered on the central axis P is referred to as a circumferential direction.

[0012] In addition, in the following description, expressions such as "fixed", "connected" and "mounted" include not only cases where components are directly fixed to each other, but also cases where components are fixed via another component. That is, in the following description, expressions such as fixed include the meaning of direct and indirect fixing of components to each other.

[0013] (Implementation Method 1) (Structure of laminated core) Reference Figures 1 to 4 , a laminated iron core 1 according to an exemplary embodiment 1 of the present invention will be described. Figure 1 As shown, the laminated core 1 has a cylindrical shape extending along the central axis P. In the present embodiment, the laminated core 1 has a plurality of plate-shaped core sheets 2 stacked in the thickness direction.

[0014] like Figure 1 and Figure 2 As shown, the core sheet 2 has: a back yoke portion 3 extending in the circumferential direction of the laminated core 1; a plurality of teeth 4 extending from the back yoke portion 3 to the radially inner side of the laminated core 1; and a slit 31 extending from the end surface of the inner circumferential side to the radially outer side between the teeth 4 adjacent in the circumferential direction of the back yoke portion 3. The core sheet 2 is formed by punching out a plate-shaped electromagnetic steel sheet as the material of the core sheet 2 to form a strip-shaped core sheet forming portion 82, and bending the core sheet forming portion 82 to be annular when viewed in the thickness direction. The details of the manufacturing method of the laminated core 1 will be described later.

[0015] The core piece 2 has a first surface 21 as one surface in the thickness direction and a second surface 22 as the other surface in the thickness direction. In this specification, when manufacturing the laminated core 1, the surface on the side where the next core piece 2 is laminated relative to the previously laminated core piece 2 is referred to as the first surface 21 of each core piece 2. That is, when the core pieces 2 are laminated from bottom to top, the upper surface is the first surface 21. In addition, there is no intention to define the lamination direction of the laminated core 1 by this.

[0016] like Figure 2 As shown, the core sheet 2 has a bonded portion 26 at a predetermined position on the first surface 21. The core sheet 2 has a bonded portion 26 at a predetermined position on the second surface 22. When the core sheet 2 is viewed in the thickness direction, the bonded portion 26 on the first surface 21 and the bonded portion 26 on the second surface 22 at least partially overlap.

[0017] like Figure 3 As shown, a two-component adhesive solidified material 7 is bonded to the bonded portion 26. The two-component adhesive solidified material 7 is obtained by chemically reacting and solidifying two liquid agents constituting the two-component adhesive, namely, the first liquid agent 5 and the second liquid agent 6. The two-component adhesive solidified material 7 can bond metal materials to each other.

[0018] That is, the core sheet 2 and another core sheet 2 adjacent in the stacking direction are bonded via the cured material 7 bonded to the bonded portion 26. Specifically, the core sheet 2 is bonded to the bonded portion 26b of the second surface 22b of another core sheet 2b stacked on the first surface 21 side via the cured material 7 bonded to the bonded portion 26 of the first surface 21. The core sheet 2 is bonded to the bonded portion 26a of the first surface 21a of another core sheet 2a stacked on the second surface 22 side via the cured material 7 bonded to the bonded portion 26 of the second surface 22. In addition, in the actual laminated core 1, the core sheets 2 and the core sheets 2a are in contact with each other at portions where no cured material 7 is provided, but in the embodiment of the present invention, the core sheets 2 and the core sheets 2a are in contact with each other at portions where no cured material 7 is provided. Figure 3 In the figure, for the sake of explanation, the above parts are shown separately.

[0019] The first liquid agent 5 and the second liquid agent 6 constituting the two-liquid adhesive do not function as adhesives independently. The first liquid agent 5 and the second liquid agent 6 start to solidify, for example, by mixing. That is, the first liquid agent 5 that is not mixed with the second liquid agent 6 does not solidify. The second liquid agent 6 that is not mixed with the first liquid agent 5 does not solidify. For example, the first liquid agent 5 is a main agent, and the second liquid agent 6 is a curing agent. In addition, the first liquid agent 5 may be a curing agent, and the second liquid agent 6 may be a main agent.

[0020] In the present embodiment, the two-component adhesive is a so-called honeymoon-type adhesive. Figure 5A and Figure 5B : is a diagram for explaining a honeymoon type adhesive. The honeymoon type adhesive can start to solidify simply by bringing the first liquid A and the second liquid B into contact. That is, in the honeymoon type adhesive, it is not necessary to premix the first liquid A and the second liquid B. Therefore, for example, the first liquid A is applied to one of two objects X and Y to be bonded, and the second liquid B is applied to the other, and the coated surfaces of the two objects X and Y are brought into contact with each other, thereby bonding the two objects X and Y. The honeymoon type adhesive is, for example, an acrylic adhesive. The main component of the first liquid A is, for example, an acrylic resin. The main component of the second liquid B is, for example, an acrylic resin.

[0021] When the object X and the object Y are overlapped and bonded in the stacking direction using a honeymoon type adhesive, for example, Figure 5A As shown in FIG. 1 , the first liquid A is applied to the surface Xa on the object Y side of the object X, and the second liquid B is applied to the surface Ya on the object X side of the object Y. Next, the object X and the object Y are overlapped in the thickness direction. Thus, the first liquid A and the second liquid B are in contact, as shown in FIG. Figure 5B As shown, the first liquid agent A and the second liquid agent B chemically react. As a result, a solidified material C that functions as an adhesive is formed between the object X and the object Y. The object X and the object Y are bonded to each other via the solidified material C.

[0022] Figure 42 is a diagram schematically showing the periphery of the bonded portion 26 on the second surface 22 of the core sheet 2 in a state where the core sheet 2a stacked on the second surface 22 side is removed. Figure 3 As shown, the solidified material 7 is located between the bonded portion 26 of the core sheet 2 and the bonded portion 26a of the core sheet 2a. As described above, the solidified material 7 is obtained by chemically reacting the first liquid agent 5 with the second liquid agent 6. Therefore, for example, the solidified material 7 is obtained by applying the second liquid agent 6 on the bonded portion 26 of the second surface 22 of the core sheet 2 and applying the first liquid agent 5 on the bonded portion 26a of the first surface 21a of the core sheet 2a.

[0023] On at least one of the core sheet 2 and another core sheet 2 stacked in the thickness direction of the core sheet 2, one of the two liquid agents constituting the two-liquid adhesive, namely, the first liquid agent 5 or the second liquid agent 6, is attached to at least a portion of the region 27 surrounding the bonded portion 26. For example, in the present embodiment, the second liquid agent 6 is attached to the entire region 27 of the core sheet 2.

[0024] (Method for manufacturing laminated core) use Figures 6 to 10 An exemplary method of manufacturing the laminated core 1 having the above-described structure will be described in detail.

[0025] Figure 6 1 is a flowchart showing an example of a method for manufacturing the laminated iron core 1. Figure 6 As shown, the method for manufacturing the laminated core 1 includes a preparation step S1 , a punching step S2 , a first coating step S3 , a bending step S4 , a second coating step S5 , and an adhesive lamination step S6 .

[0026] In the preparation step S1, an electromagnetic steel sheet as a magnetic material is prepared. In the present embodiment, the electromagnetic steel sheet is in the form of a strip that is long in one direction. In addition, the electromagnetic steel sheet is hereinafter referred to as a steel sheet 80.

[0027] In the punching step S2, the steel plate 80 is punched to form a strip-shaped core sheet forming portion 82. The core sheet forming portion 82 is a portion that becomes the core sheet 2 in the laminated core 1.

[0028] Figure 7 FIG. 8 is an example of a punching diagram of a core sheet forming portion 82 in a steel plate 80. Figure 7 In the figure, for the sake of convenience, the area of ​​the steel plate 80 to be punched is marked with oblique lines. The punching step S2 is performed by punching. That is, in the punching step S2, a punch is used to punch. Figure 7 The area with diagonal lines in the middle. Detailed description of the punching process is omitted.

[0029] In the punching process S2, the above-mentioned area of ​​the steel plate 80 is punched out to form an iron core sheet forming portion 82 having a back yoke forming portion 83, a plurality of teeth 4, and a slit 84. The back yoke forming portion 83 is in the shape of a band extending along the length direction of the steel plate 80. The plurality of teeth 4 extend from an end portion on one side in the width direction of the back yoke forming portion 83 to one side in the width direction. The slit 84 is formed between adjacent teeth 4 in the back yoke forming portion 83. The slit 84 extends from an end portion on one side in the width direction of the back yoke forming portion 83 to the other side in the width direction.

[0030] In the present embodiment, the length of the core sheet forming portion 82 in the longitudinal direction is substantially the same as the length of the outer peripheral side of the core sheet 2 . The number of teeth 4 of the core sheet forming portion 82 is the same as the number of teeth 4 of the core sheet 2 . Fig. 8A and Figure 8B A part of a core sheet forming portion 82 punched out from a steel plate 80 is shown.

[0031] Fig. 8A 1 is a diagram showing a schematic structure of one surface in the thickness direction of the core sheet forming portion 82 . Figure 8B 1 is a diagram showing a schematic structure of the other surface in the thickness direction of the core sheet forming portion 82. In the present embodiment, the one surface of the core sheet forming portion 82 is the surface that becomes the first surface 21 of the core sheet 2. The other surface of the core sheet forming portion 82 is the surface that becomes the second surface 22 of the core sheet 2.

[0032] exist Fig. 8A In FIG. 8 , reference numeral 85 indicates a first coating portion that applies the first liquid agent 5 in the first coating step S3. Figure 8B In the figure, reference numeral 86 denotes a second application portion that applies the second liquid agent 6 in the second application step S5. In the present embodiment, the area of ​​the second application portion 86 is larger than the area of ​​the first application portion 85.

[0033] like Fig. 8A and Fig. 9 As shown, in the first coating step S3 of the present embodiment, the first liquid agent 5 is coated on the first coating portion 85 of the first surface 21 of the core sheet forming portion 82. In the first coating step S3 of the present embodiment, the first liquid agent 5 is coated on the first coating portion 85 of the first surface 21 of the core sheet forming portion 82 extending in the longitudinal direction of the steel plate 80. That is, the first coating step S3 of the present embodiment is implemented before the core sheet forming portion 82 is bent into an arc shape by the bending step S4 described later.

[0034] like Fig. 9As shown, in the bending process S4, the core sheet forming portion 82 is bent into an arc shape when viewed in the thickness direction. In detail, the back yoke forming portion 83 is bent into an arc shape while the gap of the slit 84 is crushed. As a result, the length of the end portion on one side of the width direction of the back yoke forming portion 83 is shorter than the length of the end portion on the other side of the width direction. Therefore, an iron core sheet forming portion 82 that is annular when viewed in the thickness direction is formed. The annular core sheet forming portion 82 is the core sheet 2 of the laminated core 1. The slit 31 of the laminated core 1 is formed by crushing the gap of the slit 84. In addition, in the present specification, the core sheet forming portion 82 that is bent into an arc shape includes the annular core sheet forming portion 82.

[0035] like Fig. 9 As shown, in the second coating step S5, the second liquid agent 6 is coated on the second coating portion 86 of the second surface 22 of the core sheet forming portion 82. In the present embodiment, the second coating step S5 coats the second liquid agent 6 on the second coating portion 86 of the second surface 22 of the core sheet forming portion 82 bent into an arc shape by the bending step S4. Then, the core sheet forming portion 82 is bent into an annular shape when viewed from the thickness direction, thereby forming the core sheet 2.

[0036] In the bonding and laminating step S6, a plurality of core sheets 2 are overlapped in the laminating direction. Fig.10 As shown, the first liquid agent 5 applied to the first coating portion 85 of the first surface 21 is in contact with the second liquid agent 6 applied to the second coating portion 86 of the second surface 22. Therefore, the first liquid agent 5 reacts with the second liquid agent 6 and solidifies. Thus, a solidified material 7 is formed between the first coating portion 85 of the first surface 21 and the second coating portion 86 of the second surface 22. Therefore, the iron core sheets 2 adjacent to each other in the stacking direction are bonded to each other in the stacking direction. The portion to which the solidified material 7 on the first surface 21 is bonded and the portion to which the solidified material 7 on the second surface 22 is bonded become the bonded portion 26 of the laminated iron core 1.

[0037] In the present embodiment, the second liquid agent 6 is applied to a larger area than the first liquid agent 5. Therefore, in the area surrounding the bonded portion 26, the second liquid agent 6 that has not reacted with the first liquid agent 5 remains. Thus, in the laminated core 1, the second liquid agent 6 can be attached to the area 27 surrounding the bonded portion 26. In the actual laminated core 1, the portions of the core sheets 2 adjacent to each other in the stacking direction where the cured material 7 is not provided are in contact, but in the Fig.10 In the figure, for the sake of explanation, the above parts are shown separately.

[0038] That is, the exemplary method for manufacturing the laminated core 1 of the present embodiment includes a punching step S2 , a first coating step S3 , a bending step S4 , a second coating step S5 , and an adhesive lamination step S6 .

[0039] In the punching process S2, a plate-shaped iron core forming portion 82 is formed by punching a steel plate 80, and the iron core forming portion 82 has: a strip-shaped back yoke forming portion 83; a plurality of teeth 4 protruding from the back yoke forming portion 83 to one side of the width direction of the back yoke forming portion 83; and a slit 84 extending between adjacent teeth 4 in the back yoke forming portion 83 toward the other side of the width direction. In the bending process S4, for the iron core forming portion 82 formed in the punching process S2, the gap of the slit 84 is compressed and bent into an arc shape when viewed in the above-mentioned thickness direction. In the first coating process S3, a first liquid 5, which is one of the two liquids constituting a two-liquid adhesive that reacts and solidifies by contact, is coated on a first coating portion 85 on one side of the above-mentioned thickness direction of the iron core forming portion 82, i.e., the first surface 21. In the second coating step S5 , the second liquid 6 , which is the other of the two liquids, is coated on the second coating portion 86 on the second surface 22 , which is the other surface in the thickness direction of the core sheet forming portion 82 .

[0040] In the bonding and laminating step S6 , the core sheet forming portions 82 bent into arc shapes in the bending step S4 are overlapped in the laminating direction, so that the first liquid agent 5 applied to the first surface 21 in the first coating step S3 and the second liquid agent 6 applied to the second surface 22 in the second coating step S5 come into contact with each other.

[0041] In the manufacturing method of the laminated iron core 1, in the first coating step S3, the first liquid agent 5 is coated on the first surface 21, which is one surface in the thickness direction of the iron core forming part 82. In the second coating step S5, the second liquid agent 6 that is solidified by contact with the first liquid agent 5 is coated on the second surface 22, which is the other surface in the thickness direction of the iron core forming part 82. The iron core forming parts 82 overlap in the stacking direction. Therefore, by overlapping the iron core forming parts 82 in the stacking direction, the first liquid agent 5 coated on the first surface 21 of the iron core forming part 82 contacts the second liquid agent 6 coated on the second surface 22.

[0042] That is, in the above manufacturing method, when the core sheet forming part 82 is overlapped in the stacking direction, the core sheet forming part 82 is bonded in the stacking direction. Therefore, compared with the manufacturing method of stacking the core sheet forming part and fixing it in the stacking direction by welding the outer periphery, etc., the laminated core 1 can be manufactured efficiently.

[0043] Furthermore, in the above-described manufacturing method, the adhesive can be prevented from curing before laminating the core sheet forming portions 82. Therefore, it is possible to prevent the bonding strength between the core sheet forming portions 82 adjacent to each other in the lamination direction from decreasing. Therefore, the productivity of the laminated core 1 can be improved.

[0044] In the present embodiment, in the first coating step S3 , the first liquid agent 5 is coated on the first coating portion 85 of the core sheet forming portion 82 before being bent into an arc shape in the bending step S4 .

[0045] The core sheet forming portion 82 bent into an arc shape in the bending step S4 may rebound to return to the state before bending. Therefore, it may be difficult to apply the liquid agent to a specific position of the core sheet forming portion 82 bent in the bending step S4.

[0046] In contrast, in the above-described manufacturing method, the first liquid agent 5 is applied to the core sheet forming portion 82 before being bent into an arc shape. Therefore, the first liquid agent 5 can be easily applied to a specific position. Therefore, the productivity of the laminated core 1 can be improved.

[0047] Furthermore, in the present embodiment, in the second coating step S5 , the second liquid agent 6 is coated on the second coating portion 86 of the core sheet forming portion 82 bent into the arc shape in the bending step S4 .

[0048] Thus, the first liquid agent 5 and the second liquid agent 6 can be applied at different positions or in different steps with respect to the core sheet forming portion 82. Therefore, the workability of manufacturing the laminated core 1 can be improved. Therefore, the productivity of the laminated core 1 can be improved.

[0049] In addition, in the present embodiment, the area of ​​the second coating portion 86 is larger than the area of ​​the first coating portion 85. Thus, even when the core sheet forming portion 82 rebounds, the second liquid agent 6 can be easily applied.

[0050] In addition, the second liquid agent may be applied to the second coating portion of the iron core sheet forming portion before being bent into an arc shape by the bending step S4. The first liquid agent may be applied to the first coating portion of the iron core sheet forming portion after being bent into an arc shape by the bending step S4. The first liquid agent may also be applied to the first coating portion after the second liquid agent is applied to the second coating portion. However, in order to improve productivity, it is preferred to implement any one of the steps of applying the first liquid agent to the first coating portion and the step of applying the second liquid agent to the second coating portion before the bending step S4, and implement the other step after the bending step S4.

[0051] The laminated core 1 of the exemplary embodiment of the present invention manufactured by the above process is a cylindrical laminated core 1, which is formed by laminating a plurality of core sheets 2 in the thickness direction, and the core sheet 2 has: a plate-shaped back yoke portion 3 extending in the circumferential direction; a plurality of plate-shaped teeth 4 extending radially inward from the back yoke portion 3; and a slit extending radially outward from the end surface on the inner circumferential side between the teeth adjacent in the circumferential direction in the back yoke portion. The core sheet 2 and the other core sheet 2a laminated in the thickness direction are bonded via a cured product 7 of a two-component adhesive bonded to the bonded portion 26 on the second surface 22. At least one of the core sheet 2 and the other core sheet 2a has one of the two liquid agents constituting the two-component adhesive attached to at least a portion of a region 27 surrounding the bonded portion 26 when viewed from the thickness direction.

[0052] In the above-mentioned laminated iron core 1, the iron core sheets 2 adjacent to each other in the stacking direction are bonded to each other at the bonded portion 26 on the surface in the thickness direction by the solidified material 7 of the two-component adhesive. That is, the iron core sheets 2 adjacent to each other in the stacking direction can be bonded to each other when the iron core sheets are stacked in the manufacturing process. Therefore, compared with the laminated iron core obtained by the manufacturing method of welding the outer periphery of the iron core sheets 2 after stacking the iron core sheets 2, etc., the laminated iron core 1 can be obtained by an efficient manufacturing method.

[0053] The solidified material 7 is obtained by chemically reacting the first liquid agent 5 and the second liquid agent 6 constituting the two-liquid adhesive. At least one of the first liquid agent 5 and the second liquid agent 6 is attached to the region 27 surrounding the bonded portion 26 of at least one of the core sheets 2 adjacent to each other in the stacking direction. That is, the other of the first liquid agent 5 and the second liquid agent 6 is not applied to the region 27. That is, in the laminated core 1 having the above-mentioned structure, the range where the first liquid agent 5 is applied and the range where the second liquid agent 6 is applied are partially different.

[0054] Therefore, the laminated iron core 1 can be manufactured without strictly matching the range of applying the first liquid agent 5 and the range of applying the second liquid agent 6 in the process of applying the first liquid agent 5 and the second liquid agent 6. Therefore, the laminated iron core 1 can be easily manufactured. Therefore, it is possible to provide a laminated iron core 1 with improved productivity.

[0055] In the present embodiment, one of the two liquid agents is attached to a region 27 surrounding the adhered portion 26 of either the core sheet 2 or the other core sheet 2 a when viewed in the thickness direction.

[0056] That is, in the present embodiment, one of the two liquid agents is applied to the bonded portion 26, and the other of the two liquid agents is applied to a range including the bonded portion 26 and larger than the bonded portion 26. That is, the laminated iron core 1 can be manufactured without strictly positioning the core pieces 2 when applying the other liquid agent. Therefore, a laminated iron core 1 with improved productivity can be provided.

[0057] In the present embodiment, the two-liquid adhesive is a honeymoon-type adhesive that solidifies by contact between the first liquid agent 5 and the second liquid agent 6 .

[0058] In the honeymoon type adhesive that cures by contact of two liquid agents, it is not necessary to premix the first liquid agent 5 and the second liquid agent 6. Thus, for example, the first liquid agent 5 can be applied to one surface of the core sheet 2, and the second liquid agent 6 can be applied to the other surface of the core sheet 2, and the first liquid agent 5 and the second liquid agent 6 can be brought into contact and cured when the core sheets 2 are stacked. Therefore, the productivity of the laminated core 1 can be improved.

[0059] In addition, by using the honeymoon type adhesive, it is possible to suppress the curing of the adhesive before laminating the core sheets 2. This can suppress a decrease in the adhesive force between the core sheets 2 adjacent to each other in the lamination direction. Therefore, it is possible to provide a laminated core 1 with improved productivity.

[0060] (Variation of Implementation Example 1) Next, refer to Fig.11 A laminated core 101 according to a modification of Embodiment 1 will be described. In this modification, the laminated core 101 is formed by a spiral process in which a strip-shaped core sheet forming portion punched into a predetermined shape is spirally wound while being bent into an arc shape when viewed in the thickness direction.

[0061] Fig.11 This is a diagram showing a part of the laminated core 101 in an exploded manner. The back yoke portion 103 of the laminated core 101 of this modification extends spirally around the axis line and is stacked in the stacking direction.

[0062] Therefore, the core sheet 102 of the laminated core 101 is composed of the core sheet forming portion. Fig.11 In the laminated core 101 , a boundary between the core sheet 102 and another core sheet 102 a stacked in the thickness direction of the core sheet 102 is indicated by a dashed line.

[0063] In a laminated core obtained by bending a linear steel sheet into an arc shape and spirally winding the steel sheet around an axis, springback may occur after the steel sheet is spirally wound, thereby reducing dimensional accuracy of the laminated core.

[0064] In contrast, in the laminated core 101 of the present embodiment, the core sheets 102 adjacent to each other in the stacking direction are bonded to each other at the bonded portion 26 when stacked. This can suppress the springback that occurs after the core sheet forming portion is wound into a spiral shape. Therefore, the laminated core 101 can be manufactured efficiently. Therefore, the laminated core 101 with improved productivity can be provided.

[0065] (Other embodiments) The embodiments of the present invention have been described above, but the above embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above embodiments, and the above embodiments can be appropriately modified and implemented within the scope of the present invention.

[0066] In the above embodiment, the bonded portion 26 is located at the back yoke portion 3, 103. Fig.12 As shown, the bonded portion 226 of the core sheet 202 may include a tooth bonded portion 226a located at the tooth portion 4 and a back yoke bonded portion 226b located at the back yoke portion 203. Thus, a laminated core 201 can be obtained in which the core sheets 202 adjacent to each other in the stacking direction are more reliably bonded to each other.

[0067] In the above embodiment, when the core sheet 2 is observed in the thickness direction, one of the two liquid agents is attached to the region 27 surrounding the bonded portion 26 of the core sheet 2. When observed in the thickness direction, neither of the two liquid agents is attached to the region surrounding the bonded portion 26 of another core sheet 2a adjacent in the stacking direction relative to the core sheet 2. However, one of the two liquid agents may be attached to the region surrounding the bonded portion of one of the core sheets adjacent in the stacking direction. One of the two liquid agents may also be attached to the region surrounding the bonded portion of both core sheets adjacent in the stacking direction.

[0068] In the above embodiment, the second liquid agent 6 adheres to the entire region 27 surrounding the bonded portion 26 of the core sheet 2 when the core sheet 2 is viewed in the thickness direction. However, the first liquid agent may adhere to the entire region surrounding the bonded portion of the core sheet 2 when viewed in the thickness direction.

[0069] In addition, if Fig.13 As shown, when the core sheet 302 is viewed from the thickness direction, the second liquid agent 6 may be attached to a portion of the region 327 of the core sheet 302 surrounding the bonded portion 326. Alternatively, the first liquid agent may be attached to a portion of the region surrounding the bonded portion of the core sheet when viewed in the thickness direction.

[0070] In addition, the first liquid agent may be attached to a part of the above-mentioned area, and the second liquid agent may be attached to the remaining part of the above-mentioned area. Alternatively, the first liquid agent may be attached to a part of the above-mentioned area, and the second liquid agent may be attached to another part of the above-mentioned area, and neither the first liquid agent nor the second liquid agent may be attached to the remaining part of the above-mentioned area.

[0071] In addition, if Fig.14 As shown, the second liquid agent 6 may be attached to a portion of the region 427a surrounding the bonded portion 426 of one of the core sheets 402 adjacent in the stacking direction, and the first liquid agent 5 may be attached to a portion of the region surrounding the bonded portion of the other core sheet. Fig.14 In the figure, for the sake of convenience, the illustration of another iron core is omitted. Fig.14 , one core sheet 402 and the other core sheet are viewed in the stacking direction, and a portion of the core sheet 402 to which the first liquid agent 5 is attached is enclosed by a two-dot chain line in a region surrounding the bonded portion of the other core sheet.

[0072] In the above-mentioned embodiment, the contour of the bonded portion 26, 326 is circular. The contour of the bonded portion 426 is semicircular. However, the contour of the bonded portion may be polygonal or elliptical. The contour line of the bonded portion may not be a curve. The contour line of the bonded portion may be, for example, a wavy line.

[0073] In the above embodiments, the core pieces 2, 2a, 2b, 102, 102a, 302, 402 have portions to which the cured material 7 is not bonded and to which the first liquid agent 5 or the second liquid agent 6 is not attached. However, the core pieces may have the first liquid agent or the second liquid agent attached to the entire portion to which the cured material 7 is not bonded.

[0074] In the above embodiment, the contour of the first coating portion 85 is circular. The contour of the second coating portion 86 is rectangular. However, the contour of the first coating portion may be polygonal or elliptical. The contour of the second coating portion may be other polygonal or circular. The contour of the second coating portion may not be a straight line. The contour of the second coating portion may be, for example, a wavy line.

[0075] In the above embodiment, the area of ​​the second application part 86 for applying the second liquid agent 6 is larger than the area of ​​the first application part 85 for applying the first liquid agent 5. However, the area of ​​the first application part and the area of ​​the second application part may be the same. The area of ​​the first application part may be larger than the area of ​​the second application part.

[0076] In addition, as in the above-mentioned embodiment, it is preferred that the area of ​​the second coating portion is larger than the area of ​​the first coating portion. Fig.15As shown, in the second coating step S5, the second liquid agent 6 may also be coated in a film-like manner on the second coating portion 586 on the second surface 522. That is, the first liquid agent 5 may be coated narrowly and high on the first coating portion 585 on the first surface 521 coated first, and the second liquid agent 6 may be coated widely and thinly on the second coating portion 586 on the second surface 522 coated later. Thus, the first liquid agent 5 and the second liquid agent 6 can be easily reacted and cured without increasing the amount of the second liquid agent 6 used. Therefore, the decrease in the bonding force between the adjacent iron core forming portions 582 in the stacking direction can be suppressed. Therefore, the productivity of the laminated iron core can be improved.

[0077] In the above embodiment, the second liquid agent 6 is applied to a portion of the surface of the core sheet forming portion 82. However, the second liquid agent may be applied to the entire surface of the core sheet forming portion. That is, the second application portion to which the second liquid agent is applied may be the entire surface of one side of the core sheet forming portion in the thickness direction.

[0078] In the above embodiment, in the first coating step S3, the first liquid agent 5 is coated on the first surface 21, and in the second coating step S5, the second liquid agent 6 is coated on the second surface 22. However, the first liquid agent may be coated on the second surface, and the second liquid agent may be coated on the first surface. It is also possible to apply both the first liquid agent and the second liquid agent to the first surface. It is also possible to apply both the first liquid agent and the second liquid agent to the second surface.

[0079] (Structure example) Note that the present technology can adopt the following structures.

[0080] (1) A laminated iron core is a cylindrical laminated iron core formed by laminating a plurality of iron core sheets in the thickness direction, the iron core sheet having: a plate-shaped back yoke portion extending in the circumferential direction; a plurality of plate-shaped teeth extending radially inward from the back yoke portion; and a slit extending radially outward from the end surface on the inner circumference between circumferentially adjacent teeth in the back yoke portion. The iron core sheet and another iron core sheet laminated in the thickness direction are bonded via a cured product of a two-component adhesive bonded to a bonded portion on a surface in the thickness direction. At least one of the iron core sheet and the other iron core sheet has either of the two liquid agents constituting the two-component adhesive attached to at least a portion of the region surrounding the bonded portion when viewed from the thickness direction.

[0081] (2) In the laminated iron core described in (1), the two-liquid adhesive is a honeymoon-type adhesive that cures when the two liquids come into contact with each other.

[0082] (3) In the laminated core described in (1) or (2), one of the two liquid agents is attached to a region surrounding the bonded portion of either the core sheet or the other core sheet when viewed in the thickness direction.

[0083] (4) In the laminated core described in any one of (1) to (3), the bonded portion includes a teeth bonded portion located in the teeth portion and a back yoke bonded portion located in the back yoke portion.

[0084] (5) In the laminated core described in any one of (1) to (4), the back yoke portion extends spirally around the axis and is stacked in a stacking direction.

[0085] (6) A method for manufacturing a laminated iron core is a method for manufacturing a cylindrical laminated iron core, wherein the laminated iron core is stacked in the thickness direction with a plurality of plate-shaped back yoke portions extending in the circumferential direction, a plurality of plate-shaped teeth extending radially inward from the back yoke portions, and a slit extending radially outward from the end surface of the inner circumference between circumferentially adjacent teeth in the back yoke portions. The method for manufacturing a laminated iron core comprises: a punching step, in which a plate-shaped iron core sheet forming portion is formed by punching a steel plate, wherein the iron core sheet forming portion has a band-shaped back yoke forming portion, a plurality of teeth protruding from the back yoke forming portion to one side in the width direction of the back yoke forming portion, and a slit extending to the other side in the width direction between adjacent teeth in the back yoke forming portion; a bending step, in which the gap of the slit is compressed and bent into an arc shape when viewed in the thickness direction; and a first coating step, in which a surface of the iron core sheet forming portion on one side in the thickness direction is coated with a coating agent. A first coating portion applies a first liquid of one of two liquids constituting a two-liquid adhesive that reacts and solidifies by contact; a second coating step applies a second liquid of the other of the two liquids to the second coating portion on the surface on the other side of the thickness direction of the iron core sheet forming portion; and an adhesive lamination step overlaps the iron core sheet forming portion bent into an arc shape by the bending step in a lamination direction, so that the first liquid applied on the surface on one side of the thickness direction by the first coating step is in contact with the second liquid applied on the surface on the other side of the thickness direction by the second coating step.

[0086] (7) In the method for manufacturing a laminated iron core described in (6), in the first coating step, the first liquid agent is coated on the first coating portion of the core sheet forming portion before being bent into an arc shape in the bending step.

[0087] (8) In the method for manufacturing a laminated iron core described in (7), in the second coating step, the second liquid agent is coated on the second coating portion of the core sheet forming portion bent into an arc shape in the bending step.

[0088] (9) In the method for manufacturing a laminated iron core described in (8), the area of ​​the second coating portion to which the second liquid is applied in the second coating step is larger than the area of ​​the first coating portion to which the first liquid is applied in the first coating step. In the second coating step, the second liquid is applied in a film-like manner on the second coating portion.

[0089] The present invention can be applied to a method for manufacturing a laminated core in which a back yoke portion extending linearly in the longitudinal direction of the electromagnetic steel sheet and a plurality of teeth extending in the width direction of the electromagnetic steel sheet are formed by punching a strip-shaped electromagnetic steel sheet. Explanation of symbols

[0090] 1. 101, 201 laminated core 2, 2a, 2b, 102, 102a, 202, 302, 402 iron chips 3.103,203 back yoke 4 teeth 5. First liquid (one of the two liquids) 6. Second liquid (the other of the two liquids) 7. Cured product of two-component adhesive 21, 21a, 521 first surface (one surface of the core piece) 22, 22b, 522: second surface (the other surface of the core sheet) 26, 26a, 26b, 226, 326, 426 bonded portion 27, 327, 427a Area surrounding the bonded portion 31 Cutting 80 steel plate 82, 582 Iron core forming unit 83 back yoke forming part 84 Slit 85, 585 first coating part 86, 586 Second coating unit 226a tooth bonding portion 226b: back yoke bonding portion.

Claims

1. A laminated iron core is a cylindrical laminated iron core in which a plurality of iron core sheets are laminated in the thickness direction, wherein the iron core sheet comprises: a plate-shaped back yoke portion extending in the circumferential direction; a plurality of plate-shaped teeth extending radially inward from the back yoke portion; and a slit extending radially outward from an end surface on the inner circumferential side between circumferentially adjacent teeth in the back yoke portion, characterized in that: The core sheet and another core sheet stacked in the thickness direction are bonded to each other via a cured product of a two-component adhesive bonded to a bonded portion on a surface in the thickness direction. At least one of the core sheet and the other core sheet has either one of two liquid agents constituting the two-component adhesive attached to at least a portion of a region surrounding the adhered portion when viewed in the thickness direction.

2. The laminated core according to claim 1, characterized in that The two-component adhesive is a honeymoon-type adhesive that cures when the two liquids come into contact.

3. The laminated core according to claim 1 or 2, characterized in that: One of the two liquid agents is attached to a region surrounding the adhered portion of either the core sheet or the other core sheet when viewed in the thickness direction.

4. The laminated core according to claim 1 or 2, characterized in that: The bonded portion includes: a tooth-bonded portion located at the tooth portion; and A back yoke bonding portion located at the back yoke portion.

5. The laminated core according to claim 1 or 2, characterized in that: The back yoke portion extends in a spiral shape with the axis as the center, and is stacked in a stacking direction.

6. A method for manufacturing a laminated iron core, which is a method for manufacturing a cylindrical laminated iron core, wherein the laminated iron core is stacked with multiple iron core sheets in the thickness direction, and the iron core sheets have: a plate-shaped back yoke portion, the back yoke portion extending in the circumferential direction; a plurality of plate-shaped teeth, the plurality of teeth extending radially inward from the back yoke portion; and a slit, the slit extending radially outward from the end surface of the inner circumference side between the circumferentially adjacent teeth in the back yoke portion, characterized in that have: A punching step, wherein a plate-shaped iron core sheet forming portion is formed by punching a steel plate, wherein the iron core sheet forming portion has a strip-shaped back yoke forming portion, a plurality of teeth protruding from the back yoke forming portion toward one side in a width direction of the back yoke forming portion, and a slit extending toward the other side in the width direction between adjacent teeth in the back yoke forming portion; a bending step of compressing the gap of the slit and bending the core sheet formed in the punching step into an arc shape when viewed in the thickness direction; A first coating step of coating a first liquid agent, one of two liquid agents constituting a two-liquid adhesive that reacts and cures by contact, on a first coating portion on one surface in the thickness direction of the core sheet forming portion; a second coating step of coating a second liquid agent of the other of the two liquid agents on a second coating portion on the other surface of the core sheet forming portion in the thickness direction; as well as The bonding lamination process is performed by overlapping the iron core sheet forming portion bent into an arc shape in the bending process in the lamination direction, so that the first liquid applied on the surface on one side of the thickness direction in the first coating process and the second liquid applied on the surface on the other side of the thickness direction in the second coating process are in contact with each other.

7. The method for manufacturing a laminated core according to claim 6, wherein: In the first coating step, the first liquid agent is coated on the first coating portion of the core sheet forming portion before being bent into the arc shape in the bending step.

8. The method for manufacturing a laminated core according to claim 7, characterized in that: In the second coating step, the second liquid agent is coated on the second coating portion of the core sheet forming portion bent into the arc shape in the bending step.

9. The method for manufacturing a laminated core according to claim 8, characterized in that: The area of ​​the second application portion to which the second liquid agent is applied in the second application step is larger than the area of ​​the first application portion to which the first liquid agent is applied in the first application step. In the second coating step, the second liquid agent is coated in a film form on the second coating portion.

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