JP2011166887A - Device and method for manufacturing stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator manufacturing device that circularizes divided cores with higher accuracy. <P>SOLUTION: A pressurizing jig includes a cylindrical holding member in which the divided cores are arranged at the internal peripheral side and a plurality of axially penetrating insertion holes are formed, and a plurality of pressurizing pieces 52 which are inserted into the insertion holes respectively so as to be movable in the axial direction. Inside tapered faces 33, 41 and outside tapered faces 56, 57 are formed at the radial outside of the holding member at each pressurizing piece 52 and at the internal periphery of an operation jig. In the holding member, inside through-holes 55 are formed at positions corresponding to circumferential ends of the adjacent divided cores so as to penetrate the positions in the radial direction. In the operation jig 22, there are formed outside through-holes 35, 42 which are arranged on the same radial lines as those of the inside through-holes 55, penetrate in the radial direction, and enable welding to be performed from the outside. In the operation jig 22, there are formed fluid flow-in holes 38, 76 which communicate with the outside through-holes 35, 42, and can make inert gases G flow therein from the outside. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a stator manufacturing apparatus and a stator manufacturing method in which a stator core is constituted by divided cores divided for each tooth.

  Conventionally, as a stator of a brushless motor, a stator core having an annular portion and a plurality of tooth portions projecting radially inward from the annular portion, and coils each having a winding wound around each tooth portion are provided. There is. The stator core of such a stator includes, for example, a plurality of divided cores each having a divided annular portion having a shape obtained by dividing the annular portion in the circumferential direction and the teeth portion protruding from the divided annular portion. There is one in which the winding work is facilitated by winding a winding around a tooth portion before the ring is formed (see, for example, Patent Document 1).

  In patent document 1, each division | segmentation core is provided with the cylindrical holding member arrange | positioned at an inner peripheral side, and the pressurization piece arrange | positioned in the circumferential direction while being inserted in the insertion hole of a holding member so that radial movement is possible. An apparatus for manufacturing a stator is disclosed that includes a pressing jig and a cylindrical operation jig that externally fits the pressing jig. In this manufacturing apparatus, the inner peripheral surfaces of the bottomed cylindrical upper member and the lower member constituting the operation jig are formed in a tapered shape that is expanded toward the opening side, and this tapered inner peripheral surface The radially outer surface of the pressure piece of the pressure jig that is disposed oppositely is formed in a taper shape so that the radial length becomes shorter from the axial center toward both ends. For this reason, by sliding the upper member and the lower member in the axial direction so as to be on the pressing jig side, the inner peripheral surfaces of the upper member and the lower member and the radially outer surface of the pressing piece are in sliding contact. Thus, a radially inner force acts on each pressure piece. As a result, a plurality of divided cores arranged in the circumferential direction on the inner circumferential side of the holding member are pressed radially inward, and each divided core is circularized with high accuracy.

JP 2009-268179 A

  By the way, in the stator manufacturing apparatus as described above, since the split cores are welded with a laser or the like, there is a possibility that fumes (smoke containing oil) may be generated due to the influence of oil or the like adhering to the split core. When the fumes adhere to the operation jig or the like, it becomes difficult to slide the jigs, and as a result, there is a possibility that the circularization accuracy of the divided cores is lowered.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a stator manufacturing apparatus and a stator manufacturing method capable of annularly dividing a split core with higher accuracy. .

  In order to solve the above-described problem, the invention according to claim 1 is a stator core configured by arranging a plurality of divided cores each having a tooth portion in an annular shape so that a distal end side of the teeth portion faces radially inward. A stator manufacturing apparatus comprising a plurality of coils wound around the teeth portions and fixed between the circumferential end portions of adjacent divided cores by welding, And a pressurizing jig on which the operation jig is fitted, and the pressurizing jig has a plurality of insertion holes penetrating in the radial direction while the divided cores are arranged on the inner peripheral side. A cylindrical holding member formed, and a plurality of pressure pieces inserted in the insertion holes so as to be movable in the radial direction. At least one of the inner peripheries of the tool is attached to the pressurizing jig A tapered surface is formed to move the pressure pieces radially inward in accordance with the axial movement of the fitted operation jig, and the holding member penetrates in the radial direction, and the adjacent divided cores. A plurality of inner through-holes provided at positions corresponding to the circumferential end portions are formed, and the operation jig is disposed on the same radial line as the inner through-holes and penetrates in the radial direction. A plurality of outer through holes that allow welding from the outside with the circumferential ends of the adjacent divided cores facing outside, and fluid inflow holes that communicate with the outer through holes and allow fluid to flow from the outside. The gist of the present invention is that the fluid that has been formed and flows in from the fluid inflow hole is discharged to the outside through the inner through hole and the outer through hole.

  In this invention, a cylindrical operation jig and a pressure jig on which the operation jig is fitted are provided, and the pressure jig penetrates in the radial direction while each divided core is disposed on the inner peripheral side. And a plurality of pressure pieces inserted into the respective insertion holes so as to be movable in the radial direction. At least one of the radially outer side of the holding member in each pressing piece and the inner circumference of the operating jig has a diameter of each pressing piece as the operating jig externally fitted to the pressing jig moves in the axial direction. A tapered surface that moves inward in the direction is formed. The holding member is formed with a plurality of inner through-holes that are respectively pierced in the radial direction and provided at positions corresponding to the circumferential ends of the adjacent divided cores, and the operation jig is the same as each inner through-hole. A plurality of outer through-holes are formed which are arranged on the radial line and penetrate in the radial direction so that the circumferential ends of the adjacent divided cores are exposed to the outside to enable welding from the outside. In such a configuration, it is possible to fix the divided cores in a highly annularized state by welding the circumferential ends of the adjacent divided cores via the outer through hole and the inner through hole. In addition, the operation jig is formed with a fluid inflow hole that communicates with the outer through hole and allows the fluid to flow in from the outside. The fluid that has flowed in from the fluid inflow hole is discharged to the outside through the inner through hole and the outer through hole. Configured to be possible. By forming the fluid inflow hole in this way, a fluid such as nitrogen gas can be introduced from the outside and discharged from the outer through hole to the outside. Thereby, it can suppress that the fumes which may arise when welding the circumferential direction both ends of a split core via an outer through-hole and an inner through-hole adhere to a jig etc., and it can be made to slide easily. Therefore, the split core can be circularized with higher accuracy.

  According to a second aspect of the present invention, in the stator manufacturing apparatus according to the first aspect, the fluid inflow holes are provided on both axial sides of the pressurizing jig and are formed along the axial direction. The gist.

  In the present invention, the fluid inflow holes are provided on both axial sides of the pressurizing jig and are formed along the axial direction. With such a configuration, a fluid such as nitrogen gas can be supplied from both sides in the axial direction, and for example, the direction in which the fluid flows radially outward can be changed by collision of fluids flowing from both sides in the axial direction. Further, by flowing the fluid along the axial direction which is the sliding direction of the operation jig and the pressure jig (pressure piece), the operation jig and the pressure jig (pressure piece) can be more suitably used. It is possible to suppress fume from adhering to the sliding surface.

  According to a third aspect of the present invention, in the stator manufacturing apparatus according to the first or second aspect, the operation jig is a bottomed cylindrical first fitted on one end side in the axial direction of the pressure jig. 1 member and a bottomed cylindrical second member that is externally fitted to the other axial end of the pressing jig, and at least one of the first member and the second member is elastic in the axial direction. The gist is that a deformable elastic member is provided.

  In this invention, the operation jig includes a bottomed cylindrical first member that is externally fitted to one end of the pressure jig in the axial direction, and a bottom that is externally fitted to the other axial end of the pressure jig. And at least one of the first member and the second member is provided with an elastic member that is elastically deformable in the axial direction. Thus, by providing an elastic member, the axial gap between the first member and the second member can be suitably closed. For this reason, fluid such as nitrogen gas flowing in from the fluid inflow hole can be more reliably discharged from the outer through hole, and more suitably on the sliding surface of the operation jig and the pressure jig (pressure piece). It can suppress that a fume adheres.

  According to a fourth aspect of the present invention, there is provided a stator core configured by arranging a plurality of divided cores each having a tooth portion in an annular shape so that a distal end side of the tooth portion faces a radially inner side, and the tooth portion is wound around the stator core, respectively. And a plurality of pressurizing pieces around each of the divided cores. An arrangement step of arranging a pressing jig having a cylindrical holding member that holds the cylinder so as to be movable in a radial direction, and a cylindrical operation jig that is externally fitted to the pressing jig is pressed in the axial direction. By moving in the direction, each pressure piece is moved inward in the radial direction by a tapered surface formed on at least one of the radially outer side of the holding member and the inner periphery of the operation jig in each pressure piece. The pressurizing step and the pressurizing step In a state where the stator core is pressurized, a plurality of inner through holes are provided at positions corresponding to the circumferential end portions of the adjacent divided cores through the operation jig in the radial direction. A plurality of outer through-holes that are arranged on the same radial line and that penetrate the holding member in the radial direction and allow the circumferential end of the adjacent divided core to face the outside, thereby enabling welding from the outside A welding step of welding and fixing the respective divided cores through the same, and simultaneously or after the welding step, a fluid is caused to flow from a fluid inlet hole formed in the operation jig and communicated with the outer through-hole. And a discharge step of discharging the fluid to the outside through the inner through hole and the outer through hole.

  According to the present invention, it is possible to achieve the same effect as that of the first aspect.

  Therefore, according to the above-described invention, it is possible to provide a stator manufacturing apparatus and a stator manufacturing method capable of annularly dividing the split core with higher accuracy.

(A) The top view of a brushless motor, (b) AA sectional view taken on the line in Fig.1 (a). (A) The top view which looked at the stator from the holder side, (b) The BB sectional drawing in FIG.2 (b). The partial cross section figure which looked at the manufacturing apparatus in the state where the stator was arranged inside from the front. (A) The partial sectional view which looked at the upper member from the front, (b) The bottom view of the upper member, (c) The top view of the lower member, (d) The partial sectional view which looked at the lower member from the front. (A) The top view of a pressurization jig, (b) The partial sectional view which looked at the pressurization jig from the front. The partial sectional view which looked at the holding member from the front. (A) Top view of a pressure piece, (b) Side view of a pressure piece. (A) Top view of annular member, (b) Front view of annular member. The partial sectional view which looked at the lower member provided with the metal core from the front. (A) The top view of the lower member in the state where each divided core is supported by the alignment part, (b) The partial cross section which looked at the lower member in the state where each divided core was supported by the alignment part from the front Figure. The partial cross section figure which looked at the manufacturing apparatus of the state which pressed each division | segmentation core from the front.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
First, before describing the stator manufacturing apparatus and manufacturing method of the present embodiment, a brushless motor including a stator manufactured by the manufacturing apparatus and manufacturing method will be described.

  As shown in FIGS. 1A and 1B, the housing 2 of the brushless motor 1 is formed in a bottomed cylindrical shape, and a substantially cylindrical stator 3 is fixed to the inner peripheral surface thereof. Inside the stator 3, a rotor 5 is rotatably arranged via a bearing 4 provided at the center of the bottom of the housing 2. In addition, a cylindrical rotor core 7 is fixed to the rotary shaft 6 constituting the rotor 5, and the outer peripheral surface of the rotor core 7 is magnetized with different polarities (N pole, S pole) for each predetermined angle. A magnet 8 is fixed. A holder 9 made of an insulating synthetic resin material is fixed to the end of the housing 3 on the opening side of the stator 3, and the holder 9 covers one end in the axial direction of the stator 3. .

  As shown in FIGS. 2A and 2B, the stator core 10 constituting the stator 3 has an annular shape by connecting twelve divided cores 11 having a T-shape when viewed from the axial direction in the circumferential direction. It is configured. Each divided core 11 includes a divided annular portion 12 having an arc shape when viewed from the axial direction, and a tooth portion 13 that extends radially inward from a circumferential central portion of the divided annular portion 12. In the present embodiment, the divided cores 11 are fixed to each other by laser welding at both circumferential ends of the divided annular portion 12. Each divided core 11 is provided with a bobbin 14 that covers both end surfaces in the axial direction and both side surfaces in the circumferential direction of each divided core 11 from both sides in the axial direction. And the coil 16 is each wound by the teeth part 13 by winding the coil | winding 15 several times by concentrated winding from on the bobbin 14. FIG.

  As shown in FIG. 1A, the connection end 16 a of each coil 16 is pulled out to the surface of the holder 9 opposite to the stator 3 and arranged on the surface of the holder 9 opposite to the stator 3. Each of the terminals 17 is connected to a plurality (four in this embodiment) of terminals 17. In the brushless motor 1 configured as described above, a three-phase excitation current is supplied from a driving power source (not shown) through each terminal 17 (in this embodiment, three arranged on the upper side in FIG. 1A). When supplied to each coil 16, each coil 16 is excited to generate a rotating magnetic field in the stator 3, and the rotor 5 is rotated based on the rotating magnetic field.

Next, the manufacturing apparatus 21 for manufacturing the stator 3 provided in the brushless motor 1 will be described.
As shown in FIG. 3, the manufacturing apparatus 21 includes a cylindrical operation jig 22 and a pressure jig 23 to which the operation jig 22 is fitted. In the present embodiment, the operation jig 22 is an upper member 31 as a first member formed in a bottomed cylindrical shape, and is disposed coaxially with the upper member 31 and is formed in a bottomed cylindrical shape. The lower member 32 as two members, and the cored bar 71 (closed on the inner peripheral side of the split core 11 while closing the axially formed installation hole 44 formed in the lower bottom portion 43 of the lower member 32. (See FIG. 9).

  More specifically, as shown in FIGS. 4A and 4B, the upper member 31 has a first inner tapered surface 33 whose diameter increases toward the lower side in the axial direction (the other end side in the axial direction) on the inner periphery thereof. Is formed. The cylindrical portion 34 of the upper member 31 penetrates in the radial direction and the lower side in the axial direction, and 12 first outer through holes 35 along the axial direction are formed at equal intervals along the circumferential direction. Has been. Furthermore, a knockout bolt 37 is provided on the upper bottom portion 36 of the upper member 31 so as to protrude to the side opposite to the axially open end (upper side in FIG. 4A). Further, a total of three fluid inflow holes 38 penetrating in the axial direction are formed in the upper bottom portion 36 of the upper member 31 so as to be equidistant from each other in the circumferential direction at approximately 120 degrees.

  On the other hand, as shown in FIGS. 4C and 4D, the lower member 32 is formed in a cylindrical shape having the same diameter as the upper member 31, and has an axial upper side (one axial end) on the inner periphery thereof. A second inner tapered surface 41 is formed which increases in diameter toward the side. The cylindrical portion 34 of the lower member 32 penetrates in the radial direction and the upper side in the axial direction, and 12 second outer through holes 42 along the axial direction are formed at equal intervals in the circumferential direction. Has been. Further, an installation hole 44 penetrating in the axial direction is formed at the center of the lower bottom 43 of the lower member 32. A seal rubber 46 as an elastic member that is elastically deformable in the axial direction is attached to the open end 45 of the lower member 32. A gap 46 a is formed at an axially extending position of the second outer through hole 42 in the seal rubber 46. In the present embodiment, the first outer through hole 35 and the second outer through hole 42 constitute an outer through hole.

  As shown in FIGS. 5A and 5B, the pressurizing jig 23 includes a substantially cylindrical holding member 51 and a plurality of holding members 51 arranged in an annular shape and held by the holding member 51 so as to be movable in the radial direction. And a pressure piece 52. Specifically, as shown in FIG. 6, a plurality of insertion holes 54 penetrating in the radial direction and extending along the axial direction are formed in the side wall 53 of the holding member 51 at equal intervals in the circumferential direction. In addition, a plurality of inner through holes 55 penetrating in the radial direction and extending in the axial direction are formed between the insertion holes 54 in the side wall 53. Each inner through hole 55 is the same as each first outer through hole 35 and each second outer through hole 42 in a state where the upper member 31 and the lower member 32 are externally fitted to both ends of the pressing jig 23 in the axial direction. It is formed so that arrangement | positioning is possible on a radial direction line | wire. The outer diameter of the holding member 51 is smaller than the inner diameter at the upper end of the inner periphery of the upper member 31 and the inner diameter at the lower end of the inner periphery of the lower member 32.

  As shown in FIGS. 7A and 7B, the pressure pieces 52 are formed in a substantially quadrangular prism shape, and each pressure piece 52 is inserted in each insertion hole 54 so as to be movable in the radial direction. It has become so. On the radially outer side of the holding member 51 in each pressing piece 52, that is, on the radially outer side (right side in FIG. 7) in a state where each pressing piece 52 is arranged in an annular shape, from the approximate center to both ends in the axial direction. A first outer tapered surface 56 and a second outer tapered surface 57 are formed, whose thickness in the radial direction becomes thinner as they go. In the present embodiment, the first outer tapered surface 56 is in surface contact with the first inner tapered surface 33 of the upper member 31, and the second outer tapered surface 57 is the surface of the second inner tapered surface 41 of the lower member 32. It comes to contact. Further, an inner curved surface 58 corresponding to the curvature of the outer periphery of the stator 3 (stator core 10) is formed on the radially inner side (left side in FIG. 7) of the holding member 51 in the pressing piece 52. Further, step portions 59 are formed on both ends of the inner curved surface 58 in the axial direction so that the radial thickness of the pressure piece 52 is thinner than the axial center. In the present embodiment, the first and second inner tapered surfaces 33 and 41 and the first and second outer tapered surfaces 56 and 57 constitute a tapered surface.

  In this embodiment, as shown in FIG. 3, the pressurizing jig 23 includes an annular member 61 that can be elastically contracted, and each pressurizing piece 52 is fixed to the annular member 61 at both axial ends thereof. The holding member 51 is annularly arranged. Specifically, as shown in FIGS. 8A and 8B, the annular member 61 is formed in an annular shape having an abutment portion 62, and a screw hole 63 penetrating in the radial direction is provided along the circumferential direction. It is formed at equal intervals. The annular member 61 is made of a thin metal plate material. Each annular member 61 is disposed in a stepped portion 59 of each pressure piece 52 and is fixed to each pressure piece 52 with a screw (not shown). Further, the circumferential length of the abutment portion 62 is formed to be substantially equal to the interval between the adjacent pressing pieces 52 held by the holding member 51. Each pressure piece 52 can be attached to and detached from each insertion hole 54 of the holding member 51 while being integrated with each annular member 61 by elastic deformation of each annular member 61. In the state where each annular member 61 is not elastically reduced in diameter, the outer diameter defined at both axial ends of each pressing piece 52 is the inner diameter at the lower end (opening end) and the lower side at the inner periphery of the upper member 31. The inner diameter at the upper end (opening end) of the inner periphery of the member 32 is smaller than the inner diameter at the upper end of the inner periphery of the upper member 31 and the inner diameter at the lower end of the inner periphery of the lower member 32.

  Furthermore, as shown in FIG. 9, the manufacturing apparatus 21 includes a core bar 71 installed in the installation hole 44 of the lower member 32. Specifically, the cored bar 71 includes a pedestal portion 72 fitted into the installation hole 44, and an inner mold portion 74 as an inner mold member provided on the pedestal portion 72 via a connecting portion 73. A total of two fluid inflow holes 76 penetrating in the vertical direction of the pedestal portion 72 of the cored bar 71 are formed at regular intervals of approximately 180 degrees in the circumferential direction.

  The inner mold portion 74 of the cored bar 71 is formed in a columnar shape having substantially the same diameter as the inner diameter of the stator core 10, and the tips of the teeth 13 of each divided core 11 abut against each other. In addition, the cored bar 71 is provided with a plurality of (three in the present embodiment) positioning members 75 that protrude from the upper end of the pedestal 72 in the axial direction at equal intervals in the circumferential direction. ing. At least one tip of each positioning portion 75 is formed with an engaging convex portion 75a. Here, the above-described bobbin 14 is formed with engagement concave portions (not shown) corresponding to the engagement convex portions 75a of the positioning portions 75. Then, when each divided core 11 before pressurization arranged in a substantially annular shape is inserted into the inner mold portion 74, the engaging convex portion 75 a of the positioning portion 75 is engaged with the engaging concave portion, and Positioning in the circumferential direction relative to the lower member 32 is performed, and positioning in the axial direction is supported by each positioning portion 75. Specifically, in a state in which each of the divided cores 11 arranged in a substantially annular shape is supported by the positioning portion 75, both ends in the circumferential direction of each divided core 11, that is, both ends in the circumferential direction of the divided core 11 in the stator core 10 are first. The first outer through hole 35, the second outer through hole 42 and the inner through hole 55 are exposed.

Next, the manufacturing method of the stator 3 provided in the brushless motor 1 will be described focusing on the annular formation of each divided core 11 and its fixing.
First, as shown in FIGS. 10A and 10B, a cored bar 71 is installed on the lower member 32 (see FIG. 9), and each division in a state in which the winding 15 is wound around each tooth portion 13 is performed. The core 11 is formed into a substantially annular shape, and the inner mold portion 74 is disposed on the inner peripheral side thereof, so that the positioning core 75 supports the divided cores 11. In the arranging step, the pressing jig 23 is arranged around each divided core 11 supported by the positioning portion 75. The pressurizing jig 23 is arranged so that the circumferential position of each inner through hole 55 of the holding member 51 and the circumferential position of each second outer through hole 42 of the lower member 32 coincide with each other. Mounted on the second inner tapered surface 41 of the member 32. At this time, each pressurizing piece 52 is located at the approximate center in the circumferential direction of each divided annular portion 12.

  Next, in the pressurizing step, as shown in FIG. 3, the upper member 31 is added so that the circumferential position of each first outer through hole 35 and the circumferential position of each second outer through hole 42 coincide. Cover the pressure jig 23 from above. Then, the upper member 31 is pressed downward by the pressing device (not shown) so as to be close to the lower member 32, that is, the upper member 31 and the lower member 32 (operation jig 22) are pressed against the pressure jig 23. To move in the axial direction. Accordingly, the first inner tapered surface 33 of the upper member 31 and the first outer tapered surface 56 of the pressure piece 52, and the second inner tapered surface 41 of the lower member 32 and the second outer tapered surface 57 of the pressure piece 52. And the force on the radial center side acts on each pressing piece 52 from the upper member 31 and the lower member 32, respectively. When the upper member 31 and the lower member 32 (operation jig 22) are moved relative to the pressurizing jig 23 in the axial direction, a seal rubber 46 provided at the opening end 45 of the lower member 32 is provided. The gap is not generated between the upper member 31 and the lower member 32 by being moved until pressed.

  Then, as shown in FIG. 11, the annular member 61 is elastically reduced in diameter, and each pressing piece 52 is moved in the radial direction to press each divided core 11. By doing in this way, each division | segmentation core 11 is uniformly pressed along the circumferential direction by each pressurization piece 52, and each division | segmentation core 11 is cyclic | annularized with high precision.

  Subsequently, in the welding process, the circumferential ends of the split core 11 exposed to the outside from the first outer through holes 35, the second outer through holes 42, and the inner through holes 55 are fixed by laser welding. Thereby, each divided core 11 is fixed in a state of being annularized with high accuracy, and the stator 3 is manufactured. After the welding process and the discharging process, for example, an operator holds the knockout bolt 37, removes the upper member 31, and takes out the stator 3.

  In the welding process for performing laser welding, a nozzle N of a fluid supply device (not shown) is attached to the fluid inflow hole 38 of the upper member 31 and the fluid inflow hole 76 of the pedestal 72, and the fluid supply device A discharge step of discharging the inert gas G from the outer through-hole 42 by supplying an inert gas G (shown by a thick line with an arrow in FIG. 11) such as nitrogen gas to be supplied is performed. In this discharge step, an inert gas is supplied in the axial direction from the fluid inflow hole 38 of the upper member 31 and the fluid inflow hole 76 of the pedestal portion 72 formed along the axial direction. And since the inert gas G supplied from each inflow hole collides at the substantially intermediate position of the pressurizing jig 23 in the axial direction, the flowing direction of the inert gas G is automatically changed, and the first and second outer through-holes are changed. The inert gas G is discharged from the holes 35 and 42. For this reason, fumes (smoke containing oil) generated by the influence of oil or the like adhering to the split core 11 by laser welding are discharged to the outside of the operation jig 22, so that they adhere to the operation jig 22 or the like. Can be suppressed. Thereby, since it is possible to suppress the deterioration of sliding due to fume adhering to the first inner tapered surface 33 and the second inner tapered surface 41 which are sliding surfaces with the pressing piece 52 of the operation jig 22, The split core 11 can be circularized with higher accuracy. Further, since the seal rubber 46 is provided between the upper member 31 and the lower member 32, the gap in the axial direction between the upper member 31 and the lower member 32 can be suitably closed. For this reason, the inert gas G such as nitrogen gas flowing in from the fluid inflow holes 38 and 76 can be more reliably discharged from the outer through holes 35 and 42, and more preferably the operation jig 22 (the upper member 31 and It is possible to suppress fume from adhering to the first inner tapered surface 33 and the second inner tapered surface 41 which are sliding surfaces with the pressure piece 52 in the lower member 32).

Next, characteristic actions and effects of the present embodiment will be described.
(1) An operation jig 22 and a pressure jig 23 on which the operation jig 22 is fitted are provided. The pressing jig 23 has a cylindrical holding member 51 in which each divided core 11 is disposed on the inner peripheral side and a plurality of insertion holes 54 penetrating in the radial direction are formed, and the insertion holes 54 are moved in the radial direction. And a plurality of pressurizing pieces 52 inserted in a possible manner. Each pressurizing piece 52 is attached to the outer side in the radial direction of the holding member 51 in each pressurizing piece 52 and the inner periphery of the operating jig along with the axial movement of the operating jig 22 fitted on the pressurizing jig 23. First and second inner tapered surfaces 33 and 41 and first and second outer tapered surfaces 56 and 57 that are moved radially inward are formed. The holding member 51 is formed with a plurality of inner through holes 55 penetrating in the radial direction and provided at positions corresponding to the circumferential end portions of the adjacent divided cores 11, and the operation jig 22 is provided with each inner through hole. A plurality of outer through-holes 35 that are arranged on the same radial line as the hole 55 and that penetrate in the radial direction and face the end in the circumferential direction of the adjacent split core 11 to the outside, enabling welding from the outside, 42 is formed. In such a configuration, the circumferentially opposite end portions of the adjacent split cores 11 are welded via the outer through holes 35 and 42 and the inner through hole 55 so that the split cores 11 are fixed in a state of being annularized with high accuracy. can do. Further, the operation jig 22 is formed with fluid inflow holes 38 and 76 which communicate with the outer through holes 35 and 42 and into which the inert gas G can flow from the outside. The gas G is configured to be discharged to the outside through the inner through hole 55 and the outer through holes 35 and 42. By forming the fluid inflow holes 38 and 76 in this way, an inert gas G such as nitrogen gas flows in from the outside and is discharged to the outside through the inner through hole 55 and the outer through holes 35 and 42. Is possible. Thereby, it can suppress that the fume which may arise when welding the circumferential direction both ends of the split core 11 via the inner side through-hole 55 and the outer side through-holes 35 and 42 adheres to the operation jig | tool 22, etc., Since it can be made to slide easily, the split core 11 can be circularized with higher accuracy.

  (2) The fluid inflow holes 38 and 76 are provided on both sides in the axial direction of the pressurizing jig 23 and are formed along the axial direction. Specifically, the operation jig 22 includes a bottomed cylindrical upper member 31 that is fitted on one end side in the axial direction of the pressurizing jig 23, and an external end on the other end side in the axial direction of the pressurizing jig 23. When fitted, a lower member 32 and a cored bar 71 that closes the installation hole 44 penetrating in the axial direction in the lower bottom portion 43 of the lower member 32 and is disposed on the inner peripheral side of the split core are provided. The fluid inflow holes 38 and 76 are formed in the cored bar 71 (pedestal part 72) and the upper bottom part 36 of the upper member 31 in order to allow fluid to flow in from both axial sides of the pressurizing jig 23. With such a configuration, the inert gas G such as nitrogen gas can be supplied from both sides in the axial direction. For example, the inert gas G flows radially outward due to collision between the inert gases G flowing from both sides in the axial direction. The direction of flow can be changed. Further, by flowing the inert gas G along the axial direction that is the sliding direction of the operation jig 22 and the pressurization jig 23 (pressurization piece 52), the pressurization treatment of the operation jig 22 is more preferably performed. It can suppress that a fume adheres to the 1st inner side taper surface 33 and the 2nd inner side taper surface 41 which are sliding surfaces with the tool 23 (pressurization piece 52).

  (3) The operation jig 22 is externally fitted to the bottomed cylindrical upper member 31 that is externally fitted to one end of the pressing jig 23 in the axial direction and the other axial end of the pressing jig 23. The bottom member 32 is provided with a seal rubber 46 that is elastically deformable in the axial direction. Thus, by providing the seal rubber 46, the axial gap between the upper member 31 and the lower member 32 can be suitably closed. For this reason, the inert gas G such as nitrogen gas flowing in from the fluid inflow holes 38 and 76 can be more reliably discharged from the outer through holes 35 and 42, and the pressurizing jig of the operation jig 22 is more preferably used. It is possible to prevent fume from adhering to the first inner tapered surface 33 and the second inner tapered surface 41 which are sliding surfaces with respect to the pressure member 23 (pressurizing piece 52).

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the outer through holes 35 and 42 and the inner through hole 55 are formed along the axial direction. However, the present invention is not limited to this, and for example, the outer through holes 35 and 42 and the inner through hole 55 are formed with respect to the axial direction. You may form so that it may incline.

In the above-described embodiment, the fluid inflow hole 76 is formed in the pedestal portion 72 of the cored bar 71. However, the present invention is not limited thereto, and a configuration in which the fluid inflow hole is provided in the lower bottom portion 43 of the lower member 32 may be adopted.
In the above embodiment, the fluid inflow holes 38 and 76 are formed along the axial direction, but the present invention is not limited to this.

In the above embodiment, the discharging process is performed simultaneously with the welding process, but a structure in which the discharging process is performed after the welding process may be adopted.
In the above embodiment, the first outer tapered surface 56 is in surface contact with the first inner tapered surface 33 and the second outer tapered surface 57 is in surface contact with the second inner tapered surface 41. It is not necessary to make surface contact.

  In the above embodiment, the first outer taper surface 56 and the second outer taper surface 57 are formed on each pressure piece 52, the first inner taper surface 33 is formed on the upper member 31, and the second inner taper is formed on the lower member 32. A surface 41 was formed. However, the present invention is not limited thereto, and the inner peripheral surfaces of the upper member and the lower member are formed parallel to the axial direction, the first outer tapered surface 56 is in contact with the lower end of the upper member, and the second outer tapered surface 57 is the lower side. You may make it contact the upper end of a member linearly. Further, the radially outer surface of each pressure piece is formed in parallel with the axial direction, the upper end of each pressure piece is in contact with the first inner tapered surface 33 of the upper member 31, and the lower end of each pressure piece is the lower side. You may make it contact the 2nd inner side taper surface 41 of the member 32. FIG.

  In the above embodiment, the operation jig 22 is configured by the upper member 31 and the lower member 32. However, the present invention is not limited thereto, and only the jig having the first inner tapered surface 33 that is longer in the axial direction than the upper member 31. Alternatively, the operation jig 22 may be configured. In this case, it is preferable to form only the first outer tapered surface 56 on the radially outer side of the pressure piece 52.

  DESCRIPTION OF SYMBOLS 3 ... Stator, 10 ... Stator core, 11 ... Divided core, 13 ... Teeth part, 16 ... Coil, 21 ... Manufacturing apparatus, 22 ... Operation jig, 23 ... Pressing jig, 31 ... Upper member, 32 ... Lower member 33 ... first inner tapered surface, 35 ... first outer through hole, 38 ... fluid inflow hole, 41 ... second inner tapered surface, 42 ... second outer through hole, 44 ... installation hole (bottom through hole), 46 ... Seal rubber 51 ... Holding member 52 ... Pressure piece 54 ... Insertion hole 55 ... Inner through hole 56 ... First outer taper surface 57 ... Second outer taper surface 71 ... Core metal (core metal member) 76 ... Fluid inflow holes.

Claims (4)

A stator core configured by annularly arranging a plurality of divided cores each having a tooth portion so that the tip side of the tooth portion faces radially inward, and a plurality of coils wound around the tooth portion, respectively. A stator manufacturing apparatus configured by fixing between circumferential ends of adjacent divided cores by welding,
A cylindrical operation jig, and a pressure jig on which the operation jig is fitted,
The pressurizing jig includes a cylindrical holding member in which each of the divided cores is disposed on the inner peripheral side and a plurality of insertion holes penetrating in the radial direction is formed, and the insertion holes are movable in the radial direction. With a plurality of inserted pressure pieces,
At least one of the radially outer side of the holding member and the inner periphery of the operation jig in each of the pressure pieces, each of the operation jigs fitted on the pressure jig is moved in the axial direction as the operation jigs are axially moved. A tapered surface for moving the pressure piece radially inward is formed, and each of the holding members penetrates in the radial direction and is provided with a plurality of inner through holes provided at positions corresponding to the circumferential ends of the adjacent divided cores. Holes are formed,
The operation jig is arranged on the same radial line as each of the inner through-holes and penetrates in the radial direction so that the circumferential end of the adjacent divided core faces the outside, and is welded from the outside. A plurality of outer through-holes that are enabled, and a fluid inflow hole that communicates with the outer through-hole and allows a fluid to flow in from the outside, and the fluid that has flowed in from the fluid inflow hole passes through the inner through-hole and the outer through-hole. An apparatus for manufacturing a stator, characterized by being discharged to the outside through a hole.   The stator manufacturing apparatus according to claim 1, wherein the fluid inflow holes are provided on both sides in the axial direction of the pressurizing jig and are formed along the axial direction. The operation jig includes a bottomed cylindrical first member fitted on one end side in the axial direction of the pressure jig, and a bottomed cylinder fitted on the other end side in the axial direction of the pressure jig. A second member having a shape,
The stator manufacturing apparatus according to claim 1, wherein an elastic member that is elastically deformable in an axial direction is provided on at least one of the first member and the second member. A stator core configured by annularly arranging a plurality of divided cores each having a tooth portion so that the tip side of the tooth portion faces radially inward, and a plurality of coils wound around the tooth portion, respectively. A manufacturing method of a stator constituted by fixing between circumferential ends of adjacent divided cores by welding,
An arrangement step of arranging a pressure jig having a cylindrical holding member that holds a plurality of pressure pieces in a radially movable manner around each of the divided cores;
By pressing the cylindrical operation jig externally fitted to the pressure jig in the axial direction and moving in the axial direction, the holding member in the pressure piece in the radial direction outside and the operation jig in the operation jig A pressing step of moving each of the pressing pieces radially inward by a tapered surface formed on at least one of the circumferences;
In a state where the stator core is pressurized in the pressurizing step, a plurality of inner through holes provided in positions corresponding to the circumferential end portions of the adjacent divided cores through the operation jig in the radial direction, Further, it is arranged on the same radial line as each of the inner through-holes, and can be welded from the outside by passing through the holding member in the radial direction and facing the circumferential end of the adjacent divided core to the outside. A welding step of welding and fixing each of the divided cores via a plurality of outer through-holes,
Simultaneously with the welding step or after the welding step, a fluid is introduced from a fluid inflow hole formed in the operation jig and communicated with the outer through hole, and the fluid is passed through the inner through hole and the outer through hole. A stator manufacturing method comprising a discharge step of discharging to the outside.

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