JP5319407B2 - Press-fitting device and method for manufacturing stator of axial gap type rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press-fit device capable of positioning a plurality of target work components (stator coils) arranged in a circumferential direction at one time and holding them. <P>SOLUTION: The press-fit device 1 is a device for arranging stator coils 20 by moving down a press-fit member 5 from upward to downward and press-fitting it into the stator coils 20. The press-fit device 1 includes a holding member 3 for holding the plurality of stator coils 20 arranged in the circumferential direction from downward, a pedestal 4 for supporting the holding member 3 from downward, a circular press-fit member 5 to be externally engaged with the stator coils 20, and a pressing means 6 for pressing the press-fit member 5 downward. A tapered surface 52a for converting a pressing force applied to the press-fit member 5 by the pressing means 6 into a pressing force pressing the stator coils 20 in a diameter direction is formed on the inner circumferential surface 52 of the press-fit member 5. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to, for example, a press-fitting device used when assembling a stator used in a rotating electrical machine and a method for manufacturing a stator of an axial gap rotating electrical machine.

  Conventionally, many stators used in an axial gap type rotating electrical machine have been proposed. For example, Patent Document 1 discloses an axial gap type rotating electrical machine that includes a plurality of conductive bars (coil pieces) in which electromagnetic coils have conductivity and the tips to be electrically connected to each other are welded together. Has been. In this rotating electrical machine, it is shown that, by configuring the electromagnetic coil with a conductor bar, the winding process when winding the normal electromagnetic coil around the stator core is simplified and the productivity is improved. The electromagnetic coil forms the coil end by welding the tips of the six conductive bars attached to the slots at the outer peripheral edge and the inner peripheral edge of the stator core.

  The electromagnetic coil of such an axial gap type rotating electrical machine has a conductive bar inserted in a circumferential direction by inserting each conductive bar into a number of groove-like slots formed radially in an annular stator core. It is positioned and assembled with respect to it.

Moreover, when welding the edge part of the electroconductive segment (coil piece) of an electromagnetic coil, as a method of positioning by clamping the edge part of the electroconductive segment of welding object with a jig | tool, it is disclosed by patent document 2, for example. There is known a method of arranging the welded portion of the free end of the conductive segment formed.
The method for arranging the welded portion at the free end of the conductive segment is to form three teeth on a rod having a pinion that can be rotated 90 degrees by a rack, and the end of the conductive segment between the three teeth. This is a method of positioning the end portion of the welding object in the radial direction by interposing the portion.

JP 2006-288074 A (Claim 1, paragraph 0024, FIGS. 1 to 3) JP-T-2006-502688 (paragraphs 0058 to 0059, FIGS. 1 to 3)

However, the rotating electrical machine described in Patent Document 1 has a structure in which the conductive bar of the electromagnetic coil is positioned only in the circumferential direction by inserting it into a groove-shaped slot formed in the stator core. If the state of insertion in the slot is different, there is a problem in that the welded portion of the conductive bar cannot be positioned in the axial direction.
That is, since the welded portion of the end portion of the conductive bar is shifted in the axial direction, the end portions of the many conductive bars must be aligned one by one before welding. For this reason, the rotating electrical machine disclosed in Patent Document 1 has poor work efficiency, increases work time and work man-hours, and increases costs.

Moreover, the arrangement method of the welding location of the electroconductive segment of the said patent document 2 positions in a radial direction by rotating the rod 90 degree | times and interposing the edge part of an electroconductive segment between three teeth. At this time, if the positions of the conductive segments are not aligned with respect to the radial direction, the conductive segments cannot be inserted between the teeth.
For this reason, in order to insert the conductive segments between the teeth, it is necessary to align the end portions of the respective conductive segments one by one in the radial direction. Time and work man-hours have increased, which has been a factor in increasing costs.

  Furthermore, in the inventions described in Patent Document 1 and Patent Document 2, when welding, one place and one place of coil ends to be welded are sequentially joined, so that it takes time for welding work, and the work efficiency of the welding work is improved. Unfortunately, there was a problem of increased costs.

  Accordingly, the present invention has been invented to solve the above-mentioned problems, and is a press-fitting device capable of positioning, holding and press-fitting a plurality of work target parts (stator coils) arranged in the circumferential direction at a time. It is another object of the present invention to provide a method for manufacturing a stator for an axial gap type rotating electrical machine.

In order to solve the above-described problem, the press-fitting device according to claim 1 includes a holding member that holds a plurality of work target components arranged in the circumferential direction from below, a pedestal that supports the holding member from below, An annular press-fitting member that is externally fitted to the work target part; and a pressing means that presses the press-fitting member downward, and the press-fitting member is lowered and press-fitted into the work target part from above. A press-fitting device for aligning work target parts, wherein the work target part includes a plurality of coil pieces arranged in a circumferential direction on an outer peripheral part of a base member of an axial gap rotating electrical machine, and tips of adjacent coil pieces. and a connection terminal provided respectively between the parts, the the inner circumferential surface of the press member, the pressing force applied to the press-fitting member by said pressing means to press the work target component in the radial direction Wherein the tapered surface to be converted to pressure are formed.

According to this configuration, the press-fitting device is formed on the inner peripheral surface of the press-fitting member when the annular press-fitting member is pressed onto the outer periphery of the plurality of work target components arranged in the circumferential direction by pressing the pressing member. The tapered surface adjusts each work object by moving it in the axial direction. Therefore, the press-fitting member can be positioned by aligning the outer peripheral end of each work target part at the same time inside the press-fitting member by the tapered surface. Since the taper surface is continuously formed with a certain inclination, the work target component that contacts the taper surface is moved while being pressed by a pressing force that increases in proportion to the inclination of the taper surface. For this reason, an unintended excessive pressing force is applied to the work target component, and the work target component is not broken or damaged.
Moreover, according to this structure, when assembling the coil piece and connection terminal of an axial gap type rotary electric machine, both can be easily aligned and assembled.

  The press-fitting device according to claim 2 is the press-fitting device according to claim 1, wherein when the press-fitting member is externally fitted to the work target part, the press-fitting member is first inserted into the press-fitting member. The press-fitting member is formed with a reduced diameter from the start end side in contact with the work target component toward the terminal end side in contact with the work target component.

  According to such a configuration, the tapered surface is formed so that the length in the radial direction is shortened as the press-fitting member moves from the start end side toward the end end side, so that the press-fitting member is externally fitted to the work target component. As a result, the work target parts arranged in the circumferential direction are moved in the axial direction so that the outer peripheral side end parts of the work target parts are aligned at the same outer diameter position. Can do.

  The press-fitting device according to claim 3 is the press-fitting device according to claim 2, wherein the work target component is provided on the inner peripheral surface of the press-fitting member between the terminal portion and the upper surface of the press-fitting member. An annular step portion for arranging an outer fitting member to be fitted on the outer surface is formed.

  According to such a configuration, the inner peripheral surface of the press-fitting member has an annular stepped portion in which the outer fitting member to be fitted on the work target component is disposed between the terminal portion and the upper surface, so that the tapered surface is By passing the press-fitting member over the work target part beyond the end, the external fitting member can be automatically and tightly mounted on the outside of the work target part.

The method of manufacturing a stator for an axial gap type rotating electrical machine according to claim 4 includes: a plurality of coil pieces that are separated into pieces and arranged in a circumferential direction; and a connection that is provided between ends of the adjacent coil pieces. A stator for an axial gap type rotating electrical machine comprising a terminal, a temporary positioning step of temporarily positioning the connection terminals between the adjacent coil pieces, and the provisionally positioned connections. A press-fitting step for reducing the diameter by moving each connection terminal in the axial direction by fitting an annular press-fitting member to the terminal; and an opening step for releasing a diameter reduction force applied to the connection terminal from the press-fitting member; A holding step of holding the connection terminal by fitting an annular outer fitting member to the connection terminal.

According to such a configuration, in the press-fitting process, the annular press-fitting members are externally fitted to the connection terminals temporarily positioned between the coil pieces, so that the connection terminals are moved and aligned in the axial direction. The connection terminal and the coil piece can be positioned and held inside the press-fitting member. That is, the holding operation for mechanically holding the connection terminal and the coil piece and the connection operation for electrically connecting them can be performed in one step.
In the opening process, the diameter reducing force applied from the press-fitting member to the connection terminal is released, so that an excessive pressing force is prevented from being applied to the coil piece and the connection terminal, and the coil piece is prevented from being plastically deformed by the pressing force. can do. That is, the press-fitting member can be prepared by reducing the diameter of the coil piece and the connection terminal with an appropriate pressing force while maintaining the coil piece in a predetermined shape.
In the holding process, by fitting an annular outer fitting member to each connection terminal, the respective connection terminals and coil pieces are mechanically held at the same time in the press-fitting process so that the connection terminals do not fall off. A tight fit and an external fitting member can be attached. Furthermore, it is possible to keep the connection terminal and the coil piece electrically connected at a time without using welding means.

According to the press-fitting device according to claim 1 of the present invention, by pressing the annular press-fitting member having a tapered surface on the inner peripheral surface with the pressing means on the outer periphery of the plurality of work target components arranged in the circumferential direction, Each work target component can be pressed and positioned in the axial direction, and each work target component can be mechanically held. By positioning each work target component one by one and with all the work target components pressed uniformly, the positioning work is simplified, the positioning work time is greatly shortened, and the work efficiency is improved. The cost can be reduced by improving the cost.
Further, according to the press-fitting device according to claim 1 of the present invention, the coil piece and the connection terminal of the axial gap type rotating electrical machine can be easily aligned and positioned, and the assembling work can be simplified.

  According to the press-fitting device according to claim 2 of the present invention, when the press-fitting member is fitted onto the work target component, the press-fitting device moves each work target component arranged in the circumferential direction in the axial direction. By having the surface, even if there are a large number of work target parts, the outer peripheral side end parts of all the work target parts can be automatically positioned at a position inside the press-fitting member at one time regardless of the number. .

  According to the press-fitting device according to claim 3 of the present invention, the press-fitting device has a stepped portion on the inner peripheral surface of the press-fitting member for disposing the outer fitting member on which the work target component is fitted. By externally fitting the member to the work target component, the external fit member can be easily externally fitted to the aligned work target component and held in a positioned state.

According to the method of manufacturing a stator for an axial gap type rotating electrical machine according to claim 4 of the present invention, each connection terminal is moved in the axial direction by fitting a press-fit member to each temporarily positioned connection terminal. The diameter can be reduced, and the end portions of a large number of connection terminals can be positioned and aligned in a uniform state at a time. For this reason, the positioning operation can be simplified, the positioning operation time can be greatly shortened, the working efficiency can be improved, and the cost can be reduced.
In addition, by fitting an annular outer fitting member to the connection terminal, the connection terminal can be mechanically held without positioning using the welding means, and can be electrically connected. It is.
For this reason, the present invention can significantly improve the productivity and productivity by reducing the number of assembling steps, while ensuring the reliability of the connecting portion connecting the connection terminals with a simple configuration.

FIG. 3 is a perspective view schematically showing a part of the stator of the axial gap type rotating electrical machine assembled by the press-fitting device according to the present invention. FIG. 3 is an exploded perspective view schematically showing the stator of the axial gap type rotating electrical machine assembled by the press-fitting device according to the present invention with a part thereof omitted. It is a principal part disassembled perspective view of the stator coil assembled | attached by the press injection apparatus which concerns on this invention. (A) is an expansion perspective view which shows the coil piece for electric power feeding input and the coil piece for electric power feeding output, (b) and (c) are the enlarged perspective views which respectively show the coil piece for switching. (A) is a principal part enlarged plan view which shows the assembly | attachment state of the connection terminal with which the front-end | tip part of a coil piece is mounted | worn, (b) is a X section enlarged view. It is a figure which shows the stator of the axial gap type rotary electric machine assembled | attached by the press injection apparatus which concerns on this invention, (a) is a principal part disassembled perspective view, (b) is an expansion perspective view of a connecting terminal. It is a top view of one set of coil pieces which shows typically a flow of current which flows through a U-phase coil piece arranged in a stator. It is a figure which shows the press injection apparatus which concerns on this invention, and is a schematic perspective view which has a partial cross section which shows a state when a ring member is externally fitted to the stator coil of an axial gap type rotary electric machine. It is a general | schematic disassembled perspective view which has a partial cross section which shows the press-fitting member of the press-fitting apparatus which concerns on this invention, and the stator coil of an axial gap type rotary electric machine. It is a principal part perspective view which has a partial cross section which shows a state when the press-fitting member of the press-fitting device according to the present invention is externally fitted to a connection terminal of an axial gap type rotating electrical machine. (A) is YY sectional drawing of FIG. 10, (b) is a principal part which has a partial cross section which shows the state when a ring member is externally fitted to the stator coil of an axial gap type rotary electric machine by a press-fitting device. It is an expansion perspective view. It is process drawing of the manufacturing method of the stator of the axial gap type rotary electric machine which concerns on this invention. It is a figure which shows the 1st modification of the stator coil of the axial gap type rotary electric machine assembled | attached by the press injection apparatus which concerns on this invention, and is the principal part expansion disassembled perspective view which abbreviate | omitted the heat-shrinkable insulation member. It is a figure which shows the 2nd modification of the stator coil of the axial gap type rotary electric machine assembled | attached by the press injection apparatus which concerns on this invention, and is the principal part expansion disassembled perspective view which abbreviate | omitted the heat-shrinkable insulation member.

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.
The press-fitting device 1 can be used for assembling all kinds of components as long as it is a component that positions and holds a plurality of components arranged in the circumferential direction in the axial direction. As an example, a case where the stator 2 of the axial gap type rotating electrical machine shown in FIG. 1 is manufactured will be described as an example. In addition, although the stator 2 and the press-fitting device 1 (refer FIG. 8) change the direction of up-down and right-and-left depending on an installation state, the direction is described in the horizontal state for convenience.
First, before explaining the press-fitting device 1, the stator coil 20 of an axial gap type rotating electrical machine will be explained.

≪Configuration of stator≫
As shown in FIG. 2, the stator 2 is a stator of an axial gap type rotating electrical machine. The stator 2 includes an annular base member 21, a plurality of coil pieces 22 disposed on the annular base member 21, and tip portions 22 b (end portions) between adjacent coil pieces 22. A connection terminal 23 provided, a ring member 24 (outer fitting member) fitted to the connection terminal 23, a lower case 25 on which the ring member 24 and the base member 21 are placed, and the lower case 25 An outer frame case 26 that holds the ring member 24; an inner frame case 27 that holds the base member 21 between the lower case 25; an outer frame fastening member 28 that fixes the lower case 25 and the outer frame case 26; An inner frame fastening member 29 for fixing the case 25 and the inner frame case 27 is provided. In addition, this stator 2 is arrange | positioned in the state which faced the rotor which is not shown in figure, U phase input terminal U, W phase input to the electric power feeding input terminal connection part 22c (refer Fig.4 (a)) of the coil piece 22 of each phase. For example, in a state in which the power supply system (not shown) disposed in the center of the base member 21 is connected via the terminal W and the V-phase input terminal V (see FIG. 5A), It is used by being installed at a predetermined position on the vehicle wheel.

≪Structure of stator coil (work target part) ≫
The stator coil 20 is a member that forms a winding of an axial gap type rotating electrical machine, and a coil loop is formed by a large number of coil pieces 22 and connection terminals 23 for connecting the coil pieces 22.

≪Configuration of base member≫
As shown in FIG. 2, the base member 21 is formed in an annular plate shape from an insulating material such as synthetic resin, and bolt insertion holes 21a are formed in the vicinity of the inner peripheral edge at predetermined intervals. A large number of groove-shaped locking portions 21b (see FIG. 5A) are formed on the outer peripheral portion of the base member 21 to dispose a large number of coil pieces 22 at predetermined intervals in the outer peripheral direction. .

≪Composition of coil piece≫
The coil piece 22 has a large number of individual conductive plates arranged radially from the outer periphery of the base member 21 at a predetermined interval in the circumferential direction of the stator 2. As shown in FIG. The connection terminals 23 are connected to each other and assembled in a continuous state (see FIGS. 5A, 5B, and 6A). The coil piece 22 includes an intermediate coil piece 221 to be described later, a feeding input coil piece 222 having the same shape (see FIG. 4A) and a feeding output coil piece 223 (see FIG. 4A), A conductive plate having four types of shapes, that is, a switching coil piece 224 (see FIG. 4B) and a switching coil piece 225 (see FIG. 4C), in which the protruding directions of the switching terminal connecting portion 22d are different from each other, are connected. And connect. Three coil pieces 22 to which they are connected are arranged on the base member 21 so as to form coil loops of each phase of the U phase, the V phase, and the W phase. Each of the four types of coil pieces 22 exposes the proximal end portion 22a and the distal end portion 22b, and a heat-shrinkable insulating member 22e (see FIGS. 4A to 4C) between the proximal end portion 22a and the distal end portion 22b. It is covered and protected by an insulator.

  As shown in FIG. 3, the intermediate coil piece 221 that forms the intermediate portion of the stator coil 20 is cut and cut into a state of being divided into two vertically when the tip 22 b side is viewed from the side. The portions 22b and 22b are made of a substantially Y-shaped conductive plate in plan view so that the legs 22b are opened in the horizontal direction. The coil piece 22 having such a shape is assembled between the base member 21 and the connection terminal 23 so that a large number of coil pieces 22 constituting the U phase, the V phase, and the W phase are stacked in two stages vertically. In such a state, they are horizontally arranged in the circumferential direction. The coil piece 22 has a connection terminal 23 inserted between the respective distal end portions 22b, 22b of the coil piece 22 in plan view, the distal end portion 22b is disposed at a thickness interval of the connection terminal 23, and a proximal end portion 22a. Is inserted into the locking portion 21b, so that the base end portions 22a are arranged at intervals of the locking portions 21b. The intermediate coil pieces 221 for each phase are connected in a zigzag manner so that there are three turns in the counterclockwise direction and three turns in the clockwise direction.

As shown in FIG. 5A, the power supply input coil piece 222 and the power supply output coil piece 223 are arranged at the coil ends of the intermediate coil pieces 221 of each phase arranged in a large number. The power supply input coil piece 222 and the power supply output coil piece 223 have a power supply input terminal connection portion 22c at the base end portion 22a, and the distal end portion 22b side is substantially Y-shaped in plan view. It is formed in the shape which cut off one front-end | tip part 22b (refer Fig.4 (a) and FIG. 7).
A U-phase input terminal U, a W-phase input terminal W, and a V-phase input terminal V are connected to each of the feed input terminal connection portions 22c of the U-phase, V-phase, and W-phase feed input coil pieces 222. Yes. A star connection N is connected to each of the power supply output terminal connection portions 22f of the power supply output coil pieces 223 for the U phase, the V phase, and the W phase.

  The switching coil pieces 224 and 225 are conductive plates having a switching terminal connection portion 22d at the base end portion 22a for switching the direction of flowing current from counterclockwise to clockwise. The switching coil pieces 224 and 225 are arranged at a position of the third circumference, which is an intermediate position of the intermediate coil pieces 221 of the respective phases arranged around the base member 21 so as to make the left three rounds and the three rounds ( (Refer FIG.4 (b), (c) and FIG. 7).

<Configuration of connection terminal>
As shown in FIGS. 5 (a), 5 (b) and 6 (a), the connection terminal 23 electrically connects the tip portions 22b, 22b of the coil pieces 22 arranged in two stages above and below. And a member for supporting at a predetermined interval. The connection terminal 23 is installed in contact with the upper and lower side surfaces of the tip portions 22b, 22b of the coil piece 22, and the conductive member 23a for conducting the adjacent coil pieces 22 and the coil pieces 22 adjacent to each other in the circumferential direction. Insulating members 23b that are installed between the front end portions 22b and 22b for insulation.

The conductive member 23a is made of, for example, a copper flat plate member that is brought into contact with the upper tip portion 22b and the lower tip portion 22b of the coil piece 22 to conduct therethrough, and as shown in FIG. 6B, the insulating member 23b. It is adhered to the inner side surface of the film with an adhesive or the like.
As shown in FIGS. 5B and 6A, the insulating member 23b is adjacent to the conductive member 23a that is in contact with one side surface of the distal end portion 22b of the coil piece 22, with a gap therebetween. It is a member for maintaining between the coil pieces 22 and 22 which are inserted between the front-end | tip parts 22b of the coil piece 22 and adjoining in a non-contact insulation state at predetermined intervals. The insulating member 23b is made of a resin that is inserted between the coil pieces 22 and formed into an L shape in plan view of a plate-like part and a plate-like part that covers the tip side of the tip part 22b of each coil piece 22 Alternatively, it is made of an insulating member made of ceramic or the like.

<Description of current flowing through stator coil>
Next, with reference to FIG. 7, the current flow of the stator coil 20 in the U phase among the U phase, the V phase, and the W layer will be described as an example.
First, when power is supplied from the input power supply input coil piece 222 disposed on the lower side of the base member 21 (see FIG. 5), as indicated by the thick arrow a, the lower power supply input coil piece 222 A number of counterclockwise intermediate coil pieces 221 flow in the order of the upper stage, lower stage, upper stage, and lower stage to make a round around the base member 21. Further, as indicated by the broken line filled arrow b, the intermediate coil piece 221 around the base member 21 is made one turn (second turn). Further, similarly, as shown by a dashed-dotted line arrow c, when the intermediate coil piece 221 around the base member 21 is turned once (third round), it flows to the switching coil piece 224.

When flowing to the switching coil piece 225 via the switching terminal connecting portion 22d of the switching coil piece 224, as shown by a thin solid arrow d, the direction of current flow is converted clockwise from the fourth round, The intermediate coil piece 221 flows in the upper, lower, upper and lower stages and flows around the base member 21. Further, the fifth cycle flows as indicated by a dotted arrow e, the sixth cycle flows as indicated by a one-dot chain arrow f, and flows to the power supply output coil piece 223.
As described above, when the current of the stator coil 20 in the U phase flows around the base member 21 in a zigzag manner six times, the intermediate portion between the base end portion 22a and the tip end portion 22b is arranged so as to overlap vertically. Since the current flows in the same direction (peripheral direction or axial direction), the directions of the magnetic flux by the current are also matched, and the magnetic fields are combined so as to strengthen each other.

≪Configuration of ring member (external fitting member) ≫
As shown in FIG. 3, the ring member 24 is an annular member that is fitted on the connection terminal 23 and has a rectangular longitudinal section for holding the connection terminal 23 mounted between the coil pieces 22 and 22. Yes (see FIG. 8 and FIG. 9). The ring member 24 is fitted to the outside of the connection terminal 23 by a press-fitting device 1 (see FIG. 8) described later.

≪Lower case configuration≫
As shown in FIG. 2, the lower case 25 is a protective cover for covering the assembled stator coil 20, ring member 24, and base member 21 from the lower side. The lower case 25 includes a ring-shaped storage recess 25a that stores the ring member 24, the base member 21, and the stator coil 20, and a plurality of outer frame fastening members 28 that are provided on the outer periphery of the storage recess 25a. A screw hole 25b, a screw hole 25c that is disposed closer to the inside of the storage recess 25a and is screwed to the inner frame fastening member 29, and a cylindrical portion 25d that is formed on the inner periphery of the storage recess 25a are formed. .

<Outer frame case configuration>
The outer frame case 26 is an annular member for pressing and holding the ring member 24 inserted into the housing recess 25a of the lower case 25 from above. The outer frame case 26 is formed with a plurality of through holes 26 a for inserting outer frame fastening members 28 for fixing the outer frame case 26 to the lower case 25.

≪Inner frame case configuration≫
The inner frame case 27 is an annular member for holding the base member 21 inserted into the housing recess 25a of the lower case 25 from above. The inner frame case 27 is formed with a plurality of through holes 27 a for inserting inner frame fastening members 29 for fixing the inner frame case 27 to the lower case 25.

≪Configuration of press-fitting device≫
As shown in FIG. 8, the press-fitting device 1 is radially arranged by press-fitting an annular press-fitting member 5 into the plurality of stator coils 20 (work target parts) arranged in the circumferential direction by the pressing means 6. The jig device can position the connection terminal 23 at a time between the outer peripheral end portions 22 b of the stator coil 20. Further, in the press-fitting device 1, the ring member 24 is fitted inside the press-fitting member 5, and the press-fitting member 5 and the ring member 24 are fitted on the plurality of stator coils 20, so that the ring member 24 is fixed to the stator coil 20. It is also equipped with a function that can be easily fitted and assembled. The press-fitting device 1 includes a holding member 3 that holds the stator coil 20, a base 4 that supports the holding member 3, the press-fitting member 5 that is fitted on the stator coil 20, and a pressing unit 6 that presses the press-fitting member 5; It has.

≪Configuration of holding member≫
As shown in FIG. 9, the holding member 3 is a member that holds the stator coil 20 from the lower side, and includes, for example, two large and small annular members, that is, an outer annular member 31 and an inner annular member 32. Has been.
The outer annular member 31 is a member that supports the distal end portion 22b and the connection terminal 23 of the coil piece 22 from below, and engages with the outer circular stepped portion 4a formed on the pedestal 4 to be mounted on the board surface of the pedestal 4. Placed.
The inner annular member 32 is a member that supports the base end portion 22 a and the base member 21 of the coil piece 22 from the lower side, and engages with the inner circular step portion 4 b formed on the pedestal 4 to be on the board surface of the pedestal 4. Placed.

≪Configuration of pedestal≫
The pedestal 4 is a disc-shaped base laid on the lower side of the holding member 3. The pedestal 4 has the outer circular stepped portion 4a, the inner circular stepped portion 4b, a fixing hole 4c to which a lower end portion 61b of the bolt 61 of the pressing means 6 to be described later is fixed, and a bolt insertion hole 21a of the base member 21. And a plurality of screw holes 4d into which the holding bolts 8 inserted into the screw holes are screwed.

≪Configuration of press-fit member≫
The press-fitting member 5 is a jig for positioning the entire stator coil 20 by moving the connection terminal 23 and the coil piece 22 to the axial center side by being press-fitted outside the connection terminal 23 of the stator coil 20. Is formed. The press-fitting member 5 includes an outer peripheral surface 51, an inner peripheral surface 52, an upper surface 53, a lower surface 54, a tapered surface 52a formed on the inner peripheral surface 52, a step portion 52d formed on the inner peripheral surface 52, And a plurality of bolt insertion holes 5a into which the respective bolts 61 are inserted.

<Configuration of taper surface>
As shown in FIG. 10, the tapered surface 52 a is formed on the lower side of the inner peripheral surface 52, and the downward pressing force applied to the press-fitting member 5 by the pressing means 6 is applied to the connection terminal 23 (the stator coil 20). ) Is an inclined surface that converts the pressing force to the axial center side. The tapered surface 52a is formed with a reduced diameter from the start end portion 52b formed at the inner lower end of the press-fitting member 5 toward the terminal end portion 52c formed at the substantially inner center portion of the press-fitting member 5.

<Structure of the step part>
The stepped portion 52d is an annular cutout portion in which the ring member 24 (outer fitting member) that is fitted onto the connection terminal 23 (stator coil 20) is disposed between the terminal portion 52c and the upper surface 53 of the tapered surface 52a. is there. The inner side surface 24a of the ring member 24 engaged with the stepped portion 52d is disposed at a position deeper than the end portion 52c of the tapered surface 52a that is the tip of the stepped portion 52d.

  That is, as shown in FIG. 11A, the inner diameter D1 of the upper end portion 52c of the tapered surface 52a is formed smaller than the inner diameter D3 of the ring member 24. For this reason, when the connection member 23 is fitted inside the ring member 24 fitted inside the inner circumferential surface 52, the connection terminal 23 is moved from the terminal portion 52c in the outer circumferential direction to be contracted. In order to weaken the pressing force pressing in the diameter direction, the stepped portion 52d is disposed in a state where the axial center side is exposed. The inner diameter D2 of the inner peripheral surface 52 on the back side of the stepped portion 52d is formed to be slightly smaller than the outer diameter D4 of the ring member 24 with an appropriate press-fitting margin.

≪Configuration of pressing means≫
As shown in FIGS. 11A and 11B, the pressing means 6 is for pressing and pressing the press-fitting member 5 downward. For example, a bolt 61, a nut 62, and a washer 63 are provided. Each is provided with a plurality.
The bolt 61 is formed with a fixing portion that is fixed to the fixing hole 4c by welding or the like at the lower end portion 61b, and a screw portion 61a is formed on the entire upper side from the lower end portion 61b. A nut 62 is screwed into the upper end portion of the screw portion 61 a of the bolt 61 through the bolt insertion hole 5 a of the press-fitting member 5, the bolt insertion hole 7 a of the lid member 7 and the washer 63.

  As shown in FIG. 11A, the nut 62 is rotated downward in the direction indicated by the arrow A and lowered to press the washer 63, the lid member 7, the press-fitting member 5 and the ring member 24 downward in the arrow B direction. This is a member for pressing the connection terminal 23 and the coil piece 22 in the axial direction of the arrow C by the taper surface 52a while reducing the diameter and aligning them. Further, when the nut 62 is rotated in the direction of arrow A to lower the press-fitting member 5, as shown in FIG. 11B, the connection terminal 23 that has been in contact with the tapered surface 52a becomes the terminal portion 52c of the tapered surface 52a. The lower surface 54 of the press-fitting member 5 comes into contact with the board surface of the pedestal 4 and stops. The means for rotating the nut 62 may be either a manual type or an electromechanical type.

<Configuration of lid member>
The lid member 7 is placed on the ring member 24 fitted in the stepped portion 52d and the upper surface 53 of the press-fitting member 5, and when the ring member 24 is assembled to the stator 2, the ring member 24 becomes the stepped portion 52d. It is a member to be held. The lid member 7 is formed of an annular member having a flat vertical cross section, and has a plurality of bolt insertion holes 7a into which bolts 61 are inserted.

[Action of press-fitting device]
Next, the operation of the press-fitting device 1 according to the embodiment of the present invention will be described together with a method for manufacturing the stator 2 of the axial gap type rotating electrical machine.

<Coil piece cutting process>
When manufacturing the stator 2, first, as shown in FIG. 12, in the coil piece cutting step, a metal material made of a conductive metal plate is cut by, for example, laser, pressing, or wire cutting to form the coil piece 22. The elongated member is formed (step S1).

<Insulation process>
Next, a heat-shrinkable insulating member 22e made of a thermoplastic insulating tube or the like shown in FIG. 3 is provided on the metal material for the coil piece, or an insulating process is performed by coating, ripping, or the like (step S2).

<Coil piece molding process>
Subsequently, in the coil piece forming step, a metal material for the coil piece is pressed or a bending jig (not shown) is used to form a substantially Y-shaped intermediate coil piece 221 and a power supply input terminal connection portion 22c ( 4 (a)), a feeding input coil piece 223 (see FIG. 4 (a)) having a feeding output terminal connection 22f, and switching terminal connections 22d and 22d. The switching coil pieces 224 and 225 are respectively formed (step S3).

<Coil piece assembly process>
As shown in FIGS. 8 and 9, the base end portion 22 a of each coil piece 22 is inserted into each locking portion 21 b of the base member 21 fixed on the inner annular member 32 with the holding bolt 8. A coil piece assembling step to be assembled to 21 is performed (step S4). Since the coil piece 22 is bent in two steps up and down when viewed from the side, the coil piece 22 is arranged in a state of being overlapped in two steps in the circumferential direction when mounted on each locking portion 21b. (See FIG. 3).

<Temporary positioning process for connection terminals>
Next, as shown in FIG. 6A, the connection terminals 23 are respectively inserted between the tip portions 22b and 22b of the adjacent coil pieces 22, and the tip portions 22b and 22b of the upper and lower coil pieces 22 are electrically conductive members. A temporary positioning step is performed in which electrical connection is made at 23a and provisional positioning is performed with the connection terminal 23 and the tip portions 22b and 22b of the coil piece 22 aligned (step S5).

  Each coil piece 22 is arranged between the coil pieces 22 via a space that is constant in the thickness interval of the connection terminal 23 by inserting the connection terminal 23 between the tip portions 22b and 22b. The conductive member 23a is pressed against the side surface of the coil piece 22 by the insulating member 23b, and the state in which the conductive member 23a is in contact with the coil piece 22 is maintained. For this reason, without using a welding means etc., the electrically-conductive member 23a and the coil piece 22 can be electrically connected, and an assembly | attachment operation | work can be simplified.

<Press-fitting process of press-fitting member>
Next, as shown in FIG. 10, by press fitting the annular press-fitting member 5 on the temporarily positioned connection terminals 23 from above, the press-fitting is performed by moving the connection terminals 23 in the axial direction to reduce the diameter. The process is performed, and positioning is further performed to align the connection terminals 23 and the tip portions 22b of the coil pieces 22 in the circumferential direction (step S6).

  In this case, as shown in FIG. 11A, first, the bolt insertion hole 5a of the press-fitting member 5 is inserted into the bolt 61 erected on the pedestal 4, and further the bolt insertion hole 7a of the lid member 7 and the washer. 63 is inserted and the nut 62 is screwed together. The nut 62 is rotated in the right direction of the arrow A and lowered in the direction of the arrow B. When the nut 62 is lowered, the washer 63, the lid member 7, the press-fitting member 5 and the ring member 24 are lowered. Then, the outer peripheral surface of each connection terminal 23 comes into contact with the portion near the start end portion 52 b of the tapered surface 52 a of the press-fitting member 5, and the press-fitting member 5 is fitted on the connection terminal 23.

  Furthermore, when the nut 62 is rotated in the direction of arrow A to lower the press-fitting member 5, the tapered surface 52a presses and moves each connecting terminal 23 in the axial direction of the arrow C as the tapered surface 52a descends. As shown by the phantom lines in FIG. 11A, all the stator coils 20 (connection terminals 23 and coil pieces 22) arranged in a distant state in the circumferential direction are positioned at an equal distance from the axis at a time. Aligned to state. When the terminal portion 52c of the tapered surface 52a comes into contact with the outer peripheral surface of each connection terminal 23, the press-fitting member 5 causes the connection terminal 23 provided on the outer peripheral side of each stator coil 20 to have the largest diameter reduction force. Move it closer to the axis.

<Press-fit member opening process>
In the next releasing step, when the nut 62 is further rotated in the direction of arrow A to lower the press-fitting member 5, the lower surface 54 of the press-fitting member 5 comes into contact with the base 4 as shown in FIG. It can no longer descend. At this time, each connection terminal 23 is fitted into the inner side surface 24a of the ring member 24 over the terminal portion 52c of the tapered surface 52a.

  As shown in FIG. 11A, the inner side surface 24a of the ring member 24 has an inner diameter D3 larger than the inner diameter D1 of the terminal portion 52c of the tapered surface 52a. It is possible to return to the direction, and the diameter reducing force applied from the press-fitting member 5 to each connection terminal 23 can be released (step S7). As described above, since there is the stepped portion 52d, the diameter reducing force for reducing the diameter of the connection terminal 23 can be weakened. Therefore, the excessive deformation force is continuously applied to the connection terminal 23 and the coil piece 22 to cause plastic deformation. Can be prevented.

<Connection terminal holding process>
In the next holding step, as shown in FIG. 11B, the press-fitting device 1 is removed from the stator coil 20 in a state where the ring member 24 is externally fitted to the connection terminal 23 to hold the connection terminal 23 (step S8). ). In that case, first, the holding bolt 8 is inverted and extracted, the nut 62 is inverted, and the nut 62, washer 63 and the lid member 7 are extracted upward. Then, when the pedestal 4, the press-fitting member 5, the outer annular member 31 and the inner annular member 32 are extracted downward, the stator coil 20 has the ring member 24 tightly fitted around the outer periphery as shown in FIG. It will be in the state of wearing.

<Attachment process of peripheral parts>
Next, as shown in FIG. 2, a peripheral component attaching step for attaching the lower case 25, the inner frame case 27, and the outer frame case 26 to the stator coil 20 is performed (step S9). In this case, first, the stator coil 20 is housed in the housing recess 25 a of the lower case 25, the inner frame case 27 is placed on the base member 21, and the inner frame case 27 is bolted to the lower case 25.
Further, the outer frame case 26 is placed on the ring member 24 and bolted to the lower case 25. Thereby, the connection terminal 23 and the coil piece 22 are electrically connected to each other, and the outer peripheral portion is held by the ring member 24, and the upper and lower portions of the outer peripheral portion are held by the lower case 25 and the outer frame case 26. It is pinched. The base member 21 and the coil piece 22 inserted into the locking portion 21b of the base member 21 are sandwiched between the lower case 25 and the inner frame case 27 and assembled in the state of the stator 2 shown in FIG. .

<Varnish process>
The stator 2 assembled in this way is further covered with a synthetic resin such as phenol, epoxy, or silicon to improve the strength against vibration and impact, and to prevent entry of dust and moisture. Is performed (step S10).

  In the stator 2 assembled as described above, the stator coil 20 is positioned and held by the press-fitting device 1 at a time, and the coil pieces 22 and the connection terminals 23 are in contact with each other without using welding means. Since it is aligned and fixed to the above, work man-hours can be greatly reduced.

[Modification]
The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea. The present invention extends to these modifications and changes. Of course. Hereinafter, modifications of the embodiment will be described. In addition, the already demonstrated structure attaches | subjects the same code | symbol and abbreviate | omits the description.

[First Modification]
A first modification will be described with reference to FIG.
In the above-described embodiment, it has been described that the tip 22b of each coil piece 22 is connected and held by the connection terminal 23 (see FIG. 6A), but is not limited thereto.
As shown in FIG. 13, the connection terminal 23 </ b> A includes a conductive member 23 </ b> Aa formed of a U-shaped copper member in plan view that is attached to the distal end portion 22 b of the upper and lower two-stage coil pieces 22 and connected to each other. The insulating member 23Ab made of an insulating material such as a substantially wedge-shaped resin or ceramic inserted between the members 23Aa and 23Aa may be separately molded with two members and attached to the tip 22b. Even if it does in this way, the effect similar to the said embodiment can be acquired.

[Second Modification]
A second modification will be described with reference to FIG.
Furthermore, as shown in FIG. 14, the connection terminal 23 </ b> A of the first modification includes, for example, a conductive member 23 </ b> Aa of the first modification and an insulating member 23 </ b> Bb obtained by performing an insulating film treatment on a metal having spring properties. The connection terminal 23B which consists of two members may be sufficient.
In this case, the insulating member 23Bb is formed of, for example, an elastic member that is formed in a substantially zero shape and has elasticity in the thickness direction. The insulating member 23Bb is press-fitted between the conductive members 23Aa and 23Aa attached to the respective tip portions 22b of the coil piece 22, and has a spring force that presses the conductive member 23Aa in the circumferential direction of the coil piece 22. While being pressed and electrically connected to the coil piece 22, the circumferential interval of each coil piece 22 is kept constant.
The insulating member 23Bb only needs to have elasticity and insulating properties, and may be made of synthetic resin or other insulating material.

[Other variations]
The coil piece 22 has been described by taking a substantially Y-shaped example as an example. However, the present invention is not limited to this, and if the connection terminal 23 can be installed at the distal end portion 22b, the shape of the coil piece 22 is appropriately changed. It doesn't matter.
For example, the power feeding input coil piece 222, the power feeding output coil piece 223, and the switching coil pieces 224 and 225 are shaped like halves obtained by dividing the substantially Y-shaped intermediate coil piece 221 in plan view. However, the power supply input terminal connection portion 22c, the switching terminal connection portion 22d, and the power supply output terminal connection portion 22f may be provided, and may be substantially Y-shaped.
In this case, the connection terminal 23 may not be provided on one of the tip portions 22b and 22b branched in a bifurcated manner, and the insulating state may be provided.
Note that, for example, the coil piece 22 has been described as having a single-layer structure that is two-staged when viewed from the side, but it may have a layered structure other than that, such as a two-layer structure.

  The press-fitting device 1 has been described by taking the stator 2 having the coil piece 22 and the connection terminal 23 provided on the outer peripheral portion of the coil piece 22 as an example. However, the press-fitting device 1 is substantially radial from the axial direction toward the outer peripheral direction. It can be used as long as the radial member or the circumferential arrangement member arranged in the circumferential direction is positioned with respect to the radial arrangement member or the circumferential arrangement member arranged on the outer circumferential portion of the circumferential arrangement member. Is possible.

  As shown in FIG. 9, the press-fitting device 1 has been described by taking as an example the case where the coil piece 22 and the connection terminal 23 of the stator 2 formed in an annular shape are positioned. However, each member has an annular shape and a circular shape. It is not limited to. For example, even if those annular shapes shown in FIG. 9 are polygonal, similar effects can be obtained.

DESCRIPTION OF SYMBOLS 1 Press-fit apparatus 2 Stator 3 Holding member 4 Base 5 Press-fit member 6 Pressing means 20 Stator coil (work object part)
21 Base member 22 Coil piece 22a Base end 22b Tip (end)
22e Heat-shrinkable insulating member 23, 23A, 23B Connection terminal 23a, 23Aa Conductive member 23b, 23Ab, 23Bb Insulating member 24 Ring member (outer fitting member)
51 outer peripheral surface 52 inner peripheral surface 52a tapered surface 52b start end portion 52c end portion 52d stepped portion 53 upper surface 54 lower surface S5 temporary positioning step S6 press-fitting step S7 release step S8 holding step

Claims (4)

A holding member that holds a plurality of work target components arranged in the circumferential direction from below;
A pedestal for supporting the holding member from below;
An annular press-fitting member that is externally fitted to the work target component;
Pressing means for pressing the press-fitting member downward;
A press-fitting device for aligning the work target parts by lowering the press-fitting member from above to press-fit the work target parts,
The work target component includes a plurality of coil pieces arranged in a circumferential direction on an outer peripheral portion of a base member of an axial gap type rotating electrical machine,
A connection terminal provided between the tip portions of the adjacent coil pieces, and
The inner peripheral surface of the press-fitting member is formed with a tapered surface that converts the pressing force applied to the press-fitting member by the pressing means into a pressing force that presses the work target component in the radial direction. Press-fitting device.   When the press-fitting member is externally fitted to the work target part, the tapered surface comes into contact with the work target part from the start end side where the press-fitting member first contacts the work target part. 2. The press-fitting device according to claim 1, wherein the press-fitting device is formed with a reduced diameter toward the terminal end side.   On the inner peripheral surface of the press-fitting member, an annular step portion is formed between the terminal portion and the upper surface of the press-fitting member for disposing an outer fitting member that is fitted on the work target component. The press-fitting device according to claim 2. A plurality of coil pieces separated into pieces and arranged in the circumferential direction;
A connecting terminal provided between the end portions of the adjacent coil pieces, and a manufacturing method of a stator of an axial gap type rotating electrical machine,
A temporary positioning step in which the connection terminals are arranged and temporarily positioned between the adjacent coil pieces;
A press-fitting step of reducing the diameter by moving each connection terminal in the axial direction by fitting an annular press-fitting member to each provisionally positioned connection terminal;
An opening step of releasing a diameter reducing force applied to the connection terminal from the press-fitting member;
A holding step of holding the connection terminal by externally fitting an annular outer fitting member to the connection terminal;
A method of manufacturing a stator for an axial gap type rotating electrical machine, comprising:

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