Jig

Abstract

To appropriately use a jig when positioning a plurality of terminal pairs using the jig.SOLUTION: A jig is used for positioning a plurality of terminal pairs disposed side by side in a circumferential direction around a rotation axis of a rotary electric machine. The jig comprises a plurality of insertion holes for the terminal pairs. In a view in a direction of the rotation axis, the insertion holes are disposed side by side in the circumferential direction around the rotation axis. In the jig, a guide part for positioning one terminal of the terminal pair is provided in an insertion hole where at least one or more other insertion holes are positioned on both sides in the circumferential direction among the plurality of insertion holes disposed side by side in the circumferential direction.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a jig used to grip a pair of terminals to be welded together. [Background technology]

[0002] Patent Document 1 discloses a jig used when melt-joining each terminal on the stator side to each corresponding terminal on the bus bar side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-219614 Summary of the Invention

[0004] This jig has a pair of restraining members that can be displaced relative to one another in the radial direction of the motor. The opposing portions of the pair of restraining members are provided with multiple recesses that can accommodate pairs of terminals (stator-side terminals and busbar-side terminals) to be welded to each other. At one end of the stator in the direction of the rotation axis of the motor, there are positioned a plurality of pairs of terminals (a terminal on the stator side and a terminal on the bus bar side) that are welded to each other. The jig also has recesses in the same number as the number of terminal pairs to be welded together. When the pair of restraining members of the jig are displaced toward each other, each of the multiple terminal pairs to be welded together is simultaneously accommodated in a gripping hole formed between the recess of one restraining member and the recess of the other restraining member, and is gripped between the pair of restraining members. In this state, the multiple terminal pairs are fusion-welded in sequence. [Problem to be solved by the invention]

[0005] Here, when each terminal on the stator side is fused and joined to each corresponding terminal on the bus bar side, the end region of the winding drawn out from the stator region is bent radially and circumferentially, and positioned at the joining position with the corresponding terminal on the bus bar side. Therefore, bending stress acts on at least the terminals on the stator side, and they may be positioned misaligned from the intended joining position. The degree of misalignment of the terminals on the stator side varies depending on the bending stress, but because the bending stress is affected by variations in the stator manufacturing process, the degree of misalignment of the terminals on the stator side is not always constant.

[0006] In this case, when the jig is set on the stator, part of the terminal on the stator side may interfere with the edge of the recess and may not be accommodated in the gripping hole formed between the recess of one restraining member and the recess of the other restraining member. Therefore, when using a jig to position a plurality of terminal pairs, it is required to be able to use the jig appropriately. [Means for solving the problem]

[0007] One aspect of the present invention is A jig used to position a plurality of terminal pairs arranged in a circumferential direction around a rotation axis of a rotating electric machine, The jig is a plurality of insertion holes for the terminal pairs; When viewed from the rotation axis direction, the insertion holes are aligned in a circumferential direction around the rotation axis, The jig is configured such that a guide portion for positioning one terminal of the terminal pair in the circumferential direction is provided in an insertion hole among the multiple insertion holes lined up in the circumferential direction, the insertion hole having at least one other insertion hole located on both sides in the circumferential direction. [Effects of the Invention]

[0008] According to an aspect of the present invention, when a jig is used to position a plurality of terminal pairs, the jig can be used appropriately. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram illustrating the arrangement of terminals on the stator side of a motor for a vehicle. [Figure 2] FIG. 2 is a diagram illustrating the bus bar. [Figure 3] FIG. 3 is a diagram illustrating the bus bar. [Figure 4] FIG. 4 is a cross-sectional view of a bus bar. [Figure 5] FIG. 5 is a cross-sectional view of a bus bar. [Figure 6] FIG. 6 is a diagram illustrating the arrangement of terminal pairs. [Figure 7] FIG. 7 is a diagram illustrating the arrangement of terminal pairs. [Figure 8] FIG. 8 is a diagram illustrating the jig. [Figure 9] FIG. 9 is a diagram illustrating the state in which the jig is used. [Figure 10] FIG. 10 is an enlarged view of the jig. [Figure 11] FIG. 11 is a diagram illustrating the operation of the jig. [Figure 12] FIG. 12 is a diagram illustrating the operation of the jig. [Figure 13] FIG. 13 is a diagram illustrating the operation of the jig. [Figure 14] FIG. 14 is a diagram illustrating the operation of the jig. [Figure 15] FIG. 15 is a diagram illustrating the displacement of the jig. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described taking as an example a jig 5 used when fusion-joining (welding) a terminal on the stator side to a corresponding terminal on the bus bar side. FIG. 1 is a schematic diagram illustrating the arrangement of terminals T on the stator S side of a motor M for a vehicle.

[0011] 1, a stator S of a motor M (a rotating electric machine) has a cylindrical base S1 (a stator core) that is fixed to the inner periphery of a cylindrical housing HS (a peripheral wall 10). The region S2 on the inner diameter side of the base S1 (the region indicated by cross hatching in FIG. 1) is a region where windings, which are electrical conductors, are provided. The windings are made of a conductive metal material, such as copper. In the motor M, the rotor R is disposed inside this region S2.

[0012] When viewed from the opening direction of the housing HS, at one end of the stator S (the end on the front side of the paper in Figure 1), terminals T (T1 to T24) for connection to the bus bar 2 (see Figure 2) are drawn out from the winding region S2. In the following description, when there is no need to distinguish between the terminals T1 to T24, they will simply be referred to as "terminal T." In this embodiment, a total of 24 terminals T (T1 to T24) are drawn out from the winding region S2. The drawn out terminals T are divided into an inner diameter side and an outer diameter side, with 12 terminals on each side.

[0013] On the inner diameter side and the outer diameter side, two terminals are paired (hereinafter also referred to as a terminal pair) and are arranged at a predetermined interval in the circumferential direction around the axis X. Here, the axis X is a straight line concentric with the rotational axis of the rotor R. When viewed from the opening direction of the housing HS (stator S), the axis X is located at the center of the stator S. Here, "viewing the housing HS (stator S) from the opening direction," "viewing the housing HS (stator S) from the direction of the axis X," and "viewing the housing HS (stator S) from the direction of the rotational axis of the motor M" mean that the housing HS is viewed from the same direction. In the following description, the positional relationship of each component will be described with reference to the axis X as the reference, as necessary.

[0014] When viewed from the opening direction of the housing HS (stator S), the terminals T1 to T12 on the inner diameter side are located on an imaginary circle Im2 centered on the axis X. The terminals T13 to T24 on the outer diameter side are located on an imaginary circle Im1 centered on the axis X. The terminals T1 to T12 on the inner diameter side and the terminals T13 to T24 on the outer diameter side are arranged with a phase shift in the circumferential direction around the axis X. When viewed from the axis X to the outer diameter side, the terminals T13 to T24 on the outer diameter side and the terminals T1 to T12 on the inner diameter side are arranged so as not to completely overlap each other. As an example, in FIG. 1, the outer diameter side terminal set (T15, T16) is located between the inner diameter side terminal set (T1, T2) and terminal set (T3, T4) that are adjacent in the circumferential direction, and when viewed from the outer diameter side from the axis X, the inner diameter side terminal set and the outer diameter side terminal set are arranged so that they do not completely overlap.

[0015] In this embodiment, in order to connect each terminal on the stator S side to a corresponding terminal on the bus bar 2 (see Figure 2), each terminal on the stator S side is arranged on the inner diameter side and the outer diameter side in a positional relationship as shown in Figure 1.

[0016] 2 and 3 are diagrams illustrating the bus bar 2. FIG. FIG. 3 schematically shows the positional relationship between the terminals 24a and 25a on the bus bar 2 side and the terminal T on the stator S side when the terminal pairs are fusion-joined. 4 and 5 are cross-sectional views of the busbar 2. Each of these figures shows a schematic cross section of the busbar 2 taken along line A-A in FIG. 3, with the cross section facing upward. Note that FIG. 4 shows a state in which the terminals 24a and 25a on the busbar 2 side and the terminal T on the stator S side are positioned in an ideal positional relationship for fusion welding. FIG. 5 shows a state in which the terminals 24a and 25a on the busbar 2 side and the terminal T on the stator S side are positioned in a position that is different from the ideal positional relationship.

[0017] 6 and 7 are diagrams illustrating the positional relationship between the terminals 24a, 24a on the busbar 2 side and the terminal T on the stator S side. FIGS. 6 and 7 correspond to views of the terminals 24a, 24a on the busbar 2 side and the terminal T on the stator S side as viewed from the direction of the arrow AA in FIG. 4. FIG. 6 shows a state in which the terminal 24a on the busbar 2 side and the terminal T on the stator S side are positioned in an ideal positional relationship for fusion joining. FIG. 7 shows an example in which the terminal 24a on the busbar 2 side and the terminal T on the stator S side are positioned away from the ideal positional relationship. In order to make the positions of the terminals 24a, 24a and the terminals T, T easier to understand, cross hatching is applied to the end faces of the terminals 24a, 24a and the terminals T, T on the front side of the paper. In Figures 3 to 7, the multiple terminals T (T1 to T24) on the motor M side are shown with virtual lines to explain the positional relationship between the multiple terminals T (T1 to T24) on the motor M side and the terminals 24a, 25a on the bus bar 2 side.

[0018] As shown in FIG. 2, the bus bar 2 is a component for connecting a plurality of terminals T (T1 to T24) on the motor M side to a power supply line on the inverter (not shown) side. In a front view, the busbar 2 has a substantially arc-shaped base 21. Contact support portions 22 are provided on the outer periphery 21a of the base 21. The contact support portions 22 extend radially outward from the outer periphery 21a of the base 21. A plurality of the contact support portions 22 are provided at predetermined intervals in the longitudinal direction of the base 21 (the left-right direction in the drawing). Connection terminals 22a, 22b, and 22c are exposed at the tip of the contact support portion 22. Power supply lines extending from an inverter (not shown) are connected to these terminals 22a, 22b, and 22c.

[0019] A plurality of terminal sets 24 and a plurality of terminal sets 25 are provided on the inner periphery 21b of the base portion 21. The terminal set 24 is composed of a pair of terminal pieces 241, 241. The terminal piece 241 is a columnar member extending radially inward from the inner periphery 21b of the base 21. A plurality of terminal sets 24 are provided at predetermined intervals in the longitudinal direction of the base 21 (the left-right direction in the figure). In FIG. 2, a total of six terminal sets 24 are provided.

[0020] The terminal set 25 is made up of a pair of terminal pieces 251, 251. The terminal piece 251 is a columnar member extending radially inward from the inner periphery 21b of the base portion 21. A plurality of terminal sets 25 are provided at predetermined intervals in the longitudinal direction (left and right direction in the drawing) of the base 21. In FIG. 2, a total of six terminal sets 25 are provided.

[0021] 4, the terminal pieces 241, 251 have a basic shape with their tip ends bent. The tip ends of the terminal pieces 241, 251 are bent in the same direction, and the bent ends form terminals 24a, 25a that are connected to the terminal T on the stator S side. In the base portion 21, the terminals 25a on the terminal set 25 side are located closer to the inner diameter side (to the right in the drawing) than the terminals 24a on the terminal set 24 side. As shown in Figure 3, when the base 21 is viewed from the inner circumference 21b side (axis X side), the terminal sets 24 on the outer diameter side and the terminal sets 25 on the inner diameter side are arranged alternately in the longitudinal direction of the base 21 (left and right direction in the figure).

[0022] Here, the terminal pieces 241, 251 constituting the terminal sets 24, 25 are members made of a conductive metal material, for example, copper, and have portions embedded inside the base 21. The terminal pieces 241, 251 are connected to the corresponding terminals 22a, 22b, 22c of the contact support part 22, respectively. The terminals 24a, 25a of each terminal set 24, 25 are connected to the terminal T on the stator S side by fusion welding.

[0023] As shown in FIG. 3, when melt-joining the terminals 24a, 24a and the terminals 25a, 25a on the bus bar 2 side with the terminal T on the stator S side, as an example, the terminals 24a, 24a and the terminals 25a, 25a on the bus bar 2 side are positioned by the following procedure. (I) The housing HS containing the stator S is positioned with the opening of the housing HS facing upward. Next, (II) the ends of the windings drawn out from the winding region R2 are bent, and terminals T on the winding side are placed at the joint positions with terminals 24a, 25a on the bus bar 2. Then, (III) the bus bar 2 is placed on the upper end of the housing HS, and each terminal 24a, 25a on the bus bar 2 is placed at the joint position with the corresponding terminal T on the stator S (see Figure 3). 3, the housing HS, shown by the imaginary lines, is shown as viewed from above in the direction of the opening, together with the busbar 2. When the busbar 2 is placed on the housing HS, the terminals 24a, 24a and terminals 25a, 25a on the busbar 2 side are arranged on the outer diameter side of each terminal T on the stator S side. FIG. 3 also shows the busbar 2 placed on the housing HS (see the imaginary lines) with the opening facing upward.

[0024] Referring to FIG. 1, the outer diameter side terminals T13 to T24 are arranged in the positions shown in FIG. 1 after the end of the winding drawn out from the winding region S2 is bent toward the outer diameter side of the winding region S2 and then further bent in the circumferential direction so that the terminal sets are arranged at approximately equal intervals in the circumferential direction. Similarly, the inner diameter side terminals T1 to T12 are arranged at the positions shown in FIG. 1 by bending the end portions of the windings drawn out from the winding region S2 so that the terminal sets are arranged at approximately equal intervals in the circumferential direction. Therefore, bending stress acts on the terminals T1 to T12 on the inner diameter side and the terminals T13 to T24 on the outer diameter side, and when the bus bar 2 is assembled, there is variation in the relative positional relationship between each terminal T1 to T24 and the terminals 24a, 25a on the bus bar 2 side.

[0025] As shown in Figures 4 and 6, when performing fusion joining, it is preferable that the terminals 24a, 25a on the busbar 2 side and the terminal T on the stator S side are parallel to each other and in contact with each other without any gaps. However, as shown in Figures 5 and 7, the terminals 24a, 25a on the busbar 2 side and the terminal T on the stator S side may be arranged with a gap at an angle or may be arranged out of the desired positional relationship. This is because bending stress acts on the terminal T for the reasons described above. In this embodiment, a jig 5 is used to ensure that the terminals 24a, 25a on the bus bar 2 side and the terminals T on the stator S side are in reliable contact with each other when performing fusion joining.

[0026] Fig. 8 is a diagram illustrating the jig 5. Fig. 9 is a diagram illustrating the jig 5 in use. Fig. 9 schematically illustrates a state in which the jig 5 is placed on the bus bar 2 attached to one end of the housing HS from the opening side of the housing HS, and terminal pairs to be welded to each other are inserted into the insertion holes 54, 55 of the jig 5. Note that in Fig. 9, part of the jig 5 is cut away to expose part of the bus bar 2 located on the back side of the jig 5 in the plane of the drawing.

[0027] 8, insertion holes 54 (54A to 54F) and insertion holes 55 (55A to 55F) are provided in the main body 50 of the jig 5. In the following description, when there is no need to particularly distinguish between the insertion holes 54A to 54F and the insertion holes 55A to 55F, they will be simply referred to as "insertion holes 54" and "insertion holes 55." A pair of terminals (terminal 24a and terminal T, terminal 25a and terminal T) to be welded to each other is inserted into each of the insertion holes 54 and 55 (see FIG. 9). A clamping tool 56 is housed in each of the insertion holes 54, 55. Each of the tools 56 is movable forward and backward in the radial direction of the axis X. The tool 56 is provided to grip the terminal pair between the side edges 541, 551 of the insertion holes 54, 55.

[0028] When melt-joining the terminal pairs, the jig 5 is placed on the bus bar 2 fixed to the housing HS from the direction of the axis X. At this time, each of the terminal pairs is inserted into the corresponding insertion holes 54, 55. In this state, the tool 56 is moved radially outward to grip the terminal pairs between the tool 56 and the side edges 541, 551 of the insertion holes 54, 55, thereby disposing each of the terminal pairs in a predetermined position for melt-joining. The jig 5 is used to simultaneously hold and position a plurality of terminal pairs to be welded together in predetermined positions.

[0029] The configuration of the jig 5 will be specifically described below. As shown in Fig. 8, the jig 5 has an iron main body 50. The main body 50 is a plate-like member that is placed on the bus bar 2 (see Fig. 9) on the housing HS from the direction of the axis X. When viewed from the direction of the axis X, the main body 50 has an arc shape that follows the outer periphery of the housing HS.

[0030] The main body 50 is configured by assembling a base 51 and a support 52 in the radial direction of the axis X. When viewed from the direction of the axis X, the base portion 51 and the support portion 52 each have an arc shape. A width W51 of the base 51 in the radial direction of the axis X is larger than a width W52 of the support portion 52 in the radial direction of the axis X (W51>W52). An outer periphery 52a of the support portion 52 is in contact with an inner periphery 51b of the base 51 over the entire circumference. In this state, the support portion 52 is fixed to the base 51 with a bolt BL.

[0031] In the main body 50, a plurality of insertion holes 54 (54A to 54F), 55 (55A to 55F) are provided in the base 51 area. The insertion hole 55 is a notched hole that opens to the inner periphery 51b of the base 51. The outer periphery 52a of the support part 52 contacts the inner periphery 51b of the base 51, and the opening of the notched hole on the axis X side is closed by the support part 52, thereby forming the insertion hole 55 between the base 51 and the support part 52. A plurality of insertion holes 55 are provided at predetermined intervals in the circumferential direction (left-right direction in the drawing) about the axis X. In this embodiment, a total of six insertion holes 55 are lined up in the circumferential direction along the inner circumference 51b of the base 51. The total of six insertion holes 55 are each located on an imaginary circle Im2 (see FIG. 9). In this embodiment, the plurality of insertion holes 55 aligned in the circumferential direction around the axis X corresponds to the "first insertion hole row" in the present invention.

[0032] Among the insertion holes 55A to 55F, the insertion hole 55C has guide portions 555, 555, which will be described later, provided on a side edge 551 on the outer diameter side thereof. The opening area of ​​the insertion hole 55C is narrower than the other insertion holes 55A, 55B, 55D, 55E, and 55F by the amount of the guide portions 555, 555. The insertion holes 55A, 55B, 55D, 55E, and 55F have the same basic shape. The insertion hole 55C is different from the other insertion holes 55A, 55B, 55D, 55E, and 55F in that it has guide portions 555.

[0033] In the base 51, a plurality of insertion holes 54 are provided on the outer diameter side of the insertion hole 55. The insertion holes 54 are provided at predetermined intervals in the circumferential direction (left and right direction in the drawing) about the axis X. In this embodiment, a total of six insertion holes 54 are lined up in the circumferential direction on the outer diameter side of the insertion hole 55. When the base 51 is viewed from the inner periphery 51b side (axis X side), the insertion holes 54 on the outer diameter side and the insertion holes 55 on the inner diameter side are arranged alternately in the longitudinal direction of the base 51 (left and right direction in the figure). The six insertion holes 54 in total are positioned on an imaginary circle Im1 (see FIG. 9). In this embodiment, the plurality of insertion holes 54 aligned in the circumferential direction around the axis X corresponds to the "second row of insertion holes on the outer diameter side" in the present invention.

[0034] Here, of the insertion holes 54A to 54F, a guide portion 545, which will be described later, is provided on a side edge 541 on the outer diameter side of the insertion holes 54C and 54D. The opening area of ​​the insertion holes 54C and 54D is narrower than the other insertion holes 54A, 54B, 54E, and 54F by the amount of the guide portions 545. The insertion holes 54A, 54B, 54E, and 54F have the same basic shape. The insertion holes 54C and 54D differ from the other insertion holes 55A, 55B, 55D, 55E, and 55F in that they have guide portions 545. The basic shape of the insertion holes 54A, 54B, 54E, and 54F is the same as the basic shape of the insertion holes 55A, 55B, 55D, 55E, and 55F.

[0035] The insertion holes 54, 55 have a generally rectangular shape when viewed in the direction of the axis X. A tool 56 is housed inside the insertion holes 54, 55. The tool 56 is disposed opposite the side edges 541, 551 on the outer diameter sides of the insertion holes 54, 55 with a gap between them. 9, when the jig 5 is used, terminal pairs (terminal 24a and terminal T, and terminal 25a and terminal T) are inserted into the insertion holes 54 and 55. At this time, inside the insertion holes 54 and 55, the terminals 24a and terminal T, and the terminals 25a and terminal T are arranged in a positional relationship such that they are joined in the radial direction of the axis X. The tool 56 is provided to grip the terminal pair between the outer diameter side edges 541 and 551 of the insertion holes 54 and 55 .

[0036] 10 is an enlarged view of the jig 5. In FIG. 10, a part of the main body 50 (base 51, support 52) ​​is shown in cross section along the tool 56. As shown in FIG. 10, a recess 561 is provided in a portion of the tool 56 facing the side edges 541, 551 (see the hatched areas in the insertion holes 54F, 55E in the figure). The recess 561 is formed to a size capable of accommodating the terminals T, T. The recess 561 is provided with a protrusion 562 protruding toward the side edges 541, 551 at approximately the center in the circumferential direction. Both sides of the protrusion 562 are flat surfaces 561a, 561a that are parallel to each other (see the insertion holes 54E, 55D in the figure). Both sides of the flat surfaces 561a, 561a are connected to inclined surfaces 561b, 561b. The inclined surfaces 561b, 561b are inclined in a direction such that the circumferential separation distance W increases toward the side edges 541, 551 (outer diameter side).

[0037] In the tool 56, a shaft member 57 is connected to the side opposite to the recessed portion 561 (see insertion holes 54B and 55B in the figure). The shaft member 57 is a rod-shaped member that extends linearly along the extension of the protrusion 562 in a direction away from the recessed portion 561. The shaft member 57 provided on the inner diameter side tool 56 penetrates a support hole 521 provided in the support portion 52 in the radial direction. The shaft member 57 provided on the outer diameter side tool 56 penetrates the insertion hole 511 provided in the support portion 52 and the support hole 521 provided in the support portion 52 in the radial direction. In the main body 50, the shaft member 57 of the tool 56 on the inner diameter side and the shaft member 57 of the tool 56 on the outer diameter side are supported so as to be movable forward and backward in the radial direction of the axis X.

[0038] Each of the shaft members 57 is provided with engagement portions 571 that protrude in the same direction (toward the viewer in the drawing) in an area that protrudes radially inward beyond the support portion 52. Each of the engagement portions 571 is located on an imaginary circle Im3 centered on the axis X. An operator of an actuator (not shown) engages with each of the locking portions 570. The shaft members 57 can move forward and backward radially about the axis X at the same timing by an operating force applied from the actuator (not shown).

[0039] One insertion hole 55C of the plurality of insertion holes 55 arranged in the circumferential direction around the axis X on the inner diameter side of the main body 50 is provided with guide portions 555, 555. In this embodiment, the insertion holes 55 to be provided with the guide portions 555, 555 are determined based on the midpoint in the circumferential direction between the insertion hole 55A located at one end in the circumferential direction and the insertion hole 55F located at the other end. Specifically, the guide portion 555, 555 is provided in one of the insertion holes 55C, 55D, which is closest to the straight line (midpoint C55) passing through the midpoint and the axis X.

[0040] 11 to 14 are diagrams illustrating the operation of the jig. Fig. 11 illustrates the gripping of the terminal pair by the tool 56 by enlarging the area around the insertion hole 55C in the jig 5. Fig. 12 illustrates the gripping of the terminal pair by the tool 56 in a cross section taken along line AA in Fig. 11. 13 illustrates, with an enlarged view, the area around insertion hole 54D in jig 5 to explain how the terminal pair is gripped by tool 56. FIG. 14 illustrates, in a cross section taken along line AA in FIG. 13, how the terminal pair is gripped by tool 56.

[0041] As shown in FIG. 11, the basic shape of the insertion hole 55 is a substantially rectangular shape consisting of an outer diameter side edge 551, an inner diameter side edge 552, and side edges 553 and 554 connecting the ends of these side edges 551 and 551 to each other. In the insertion hole 55C, the guide portions 555, 555 are located on both sides of the side edge 551 in the circumferential direction around the axis X. The guide portions 555, 555 are provided across the outer diameter side edge 551 and the side edges 553, 554. The guide portions 555, 555 protrude into the insertion hole 55C. The guide portions 555, 555 are arranged opposite to each other with a middle line LC55 therebetween.

[0042] The guide portions 555 have inclined surfaces 555a that face each other across a middle line LC55 that passes through the circumferential middle of the insertion hole 55C. The inclined surfaces 555a are inclined so that they approach each other as they approach the outer diameter side (upward in the drawing). A distance Wx between the inclined surfaces 555a in the circumferential direction around the axis X (left-right direction in the drawing) becomes smaller as they approach the outer diameter side. In the insertion hole 55C, the circumferential distance Wx between the regions where the guide portions 555, 555 are provided is narrower than the circumferential distance Wa between the other regions where the guide portions 555, 555 are not provided. The inner diameter side ends of the inclined surfaces 555a, 555a are connected to inner circumferential surfaces 555b, 555b that follow an imaginary circle Im5. The imaginary circle Im5 has a smaller outer diameter than an imaginary circle Im4 that follows the side edge 551 on the outer diameter side of the insertion hole 55C. Therefore, in the insertion hole 55C, the distance between the insertion hole 55C in the circumferential direction (left-right direction in the figure) and the radial direction (up-down direction in the figure) is narrow in the portions where the guide portions 555, 555 are provided.

[0043] The tool 56 is movable forward and backward in a radial direction of the axis X (in FIG. 11, a direction along the midpoint line LC55). When the tool 56 is moved in a direction (upward in the drawing) approaching the side edge 551, the terminal pair (terminal 25a, terminal T) to be fusion-joined to each other is gripped in a state of contact with each other between the side edge 541 and the tool 56 (flat surfaces 561a, 561a) (see FIGS. 11 and 12).

[0044] At this time, if there is a large misalignment in the circumferential direction (left and right direction in the drawing), the outer diameter side terminals 25a, 25a are displaced toward the outer diameter side edge 551 side (upper side in the drawing) while sliding on the inclined surface 555a of the guide portion 555. As a result, the circumferential misalignment of the terminals 25a is corrected by the inclined surface 555a. Similarly, if the terminals T, T on the inner diameter side are significantly misaligned in the circumferential direction (left and right direction in the drawing), they are displaced toward the side edge 551 on the outer diameter side (upper side in the drawing) while sliding on the inclined surface 561b of the tool 56. As a result, the misalignment of the terminals T, T in the circumferential direction is corrected by the inclined surface 561b.

[0045] In this embodiment, the terminal pair is positioned in the radial direction of the axis X by the tool 56 and the side edge 551 of the insertion hole 55C. The terminal pair is positioned in the circumferential direction around the axis X by the inclined surface 555a of the guide portion 555 and the inclined surface 561b of the tool 56. Here, the radial thickness W555 of the guide portion 555 is set to be equal to or less than half the thickness W25 of the terminal 25a. As an example, the thickness W555 is set based on the results of a simulation or the like so as to restrict the circumferential movement of the terminal 25a while maximizing the opening area of ​​the insertion hole 55C.

[0046] As shown in FIG. 13, the basic shape of the insertion hole 54 located on the outer diameter side of the insertion hole 55 is a substantially rectangular shape consisting of a side edge 541 on the outer diameter side, a side edge 542 on the inner diameter side, and side edges 543 and 544 connecting the ends of these side edges 541 and 542 to each other. In the insertion holes 54C and 54D, the guide portions 545 are located on both sides of the side edge 541 in the circumferential direction around the axis X.

[0047] The guide portions 545, 545 are formed in the same shape as the guide portions 555, 555 described above. The guide portions 545, 545 are also provided straddling the outer diameter side edge 541 and the side edges 543, 544. The guide portions 545, 545 protrude into the insertion hole 54D. The guide portions 545, 545 are arranged opposite each other with the intermediate line LC54 therebetween. In the insertion hole 54C, guide portions 545, 545 are also arranged opposite to each other in a similar configuration.

[0048] The guide portions 545 have inclined surfaces 545a that face each other across a middle line LC54 that passes through the circumferential middle of the insertion hole 54D. The inclined surfaces 545a are inclined so that they approach each other as they approach the outer diameter side (upward in the drawing). A distance Wx between the inclined surfaces 545a in the circumferential direction about the axis X (left-right direction in the drawing) decreases as they approach the outer diameter side. In the insertion holes 54C and 54D, the circumferential spacing Wx of the region where the guide portions 545, 545 are provided is narrower than the circumferential spacing Wa of the other region where the guide portions 545, 545 are not provided. The inner diameter side ends of the inclined surfaces 545a, 545a are connected to inner circumferential surfaces 545b, 554b that follow an imaginary circle Im7. The imaginary circle Im7 has a smaller outer diameter than an imaginary circle Im6 that follows the side edge 541 on the outer diameter side of the insertion hole 54D. Therefore, in the insertion hole 54D, the distance between the guide portions 545, 545 in the circumferential direction (left-right direction in the drawing) and the radial direction (up-down direction in the drawing) of the insertion hole 54D is narrow.

[0049] As described above, the tool 56 is movable forward and backward in the radial direction of the axis X (in FIG. 11, the direction along the intermediate line LC54). When the tool 56 is moved in a direction approaching the side edge 541 (upward in the drawing), the terminal pair (terminal 24a, terminal T) to be fusion-joined to each other is gripped in a state of contact with each other between the side edge 541 and the tool 56 (flat surfaces 561a, 561a) (see FIGS. 13 and 14).

[0050] At this time, if there is a large misalignment in the circumferential direction (left and right direction in the drawing), the terminals 24a on the outer diameter side are displaced toward the side edge 541 on the outer diameter side (upper side in the drawing) while sliding on the inclined surface 545a of the guide portion 545. As a result, the misalignment in the circumferential direction of the terminals 24a is corrected by the inclined surface 545a. Similarly, if the terminals T, T on the inner diameter side are significantly misaligned in the circumferential direction (left and right direction in the drawing), they are displaced toward the side edge 551 on the outer diameter side (upper side in the drawing) while sliding on the inclined surface 561b of the tool 56. As a result, the misalignment of the terminals T, T in the circumferential direction is corrected by the inclined surface 561b.

[0051] In this embodiment, the terminal pair is positioned in the radial direction of the axis X by the tool 56 and the side edge 541 of the insertion hole 54D. The terminal pair is positioned in the circumferential direction around the axis X by the inclined surface 545a of the guide portion 545 and the inclined surface 561b of the tool 56. Here, the radial thickness W545 of the guide portion 545 is set to be equal to or less than half the thickness W25 of the terminal 24a. As an example, the thickness W545 is set based on the results of simulations or the like so as to restrict the circumferential movement of the terminal 24a while maximizing the opening areas of the insertion holes 54C and 54D.

[0052] In this embodiment, guide portions 555, 545 are provided not on all of the insertion holes 54, 55 but on some of the insertion holes. Here, when a terminal pair (terminal 25a, terminal T) is gripped between the side edge 551 and the insertion hole 55C in which the guide portion 555 is provided, depending on the degree of circumferential positional deviation of the terminal 25a, the terminal 25a may slide along the inclined surface 555a of the guide portion 555. For example, as shown in FIG. 11, the terminal 25a (the terminal on the right side in the figure) may be displaced toward the opposite terminal 25a (the terminal on the left side in the figure) by sliding along the inclined surface 555a, thereby correcting its position. In this case, a reaction force acts on guide portion 555 from terminal 25a sliding on inclined surface 555a (see arrow a in the figure).

[0053] Here, if guide portions 555 are also provided in the other adjacent insertion holes 55B and 55A, the correction of the position of the terminal 25a in the guide portion 555 of the insertion hole 55B will be affected by the correction of the position of the terminal 25a in the guide portion 555 of the insertion hole 55C. 15, when the position of the terminal 25a is corrected by the guide portion 555 on the right side of the insertion hole 55C in the figure and the jig 5 is displaced to the right in the circumferential direction with respect to the insertion hole 55C, the positions of the other adjacent insertion holes 55A and 55B are also displaced in the circumferential direction. The amount of displacement at this time becomes larger for insertion holes located farther away from the insertion hole 55C because the amount of displacement accumulates.

[0054] The circumferential width of the insertion hole is determined based on the circumferential width of the terminal and the average amount of misalignment of the terminal in the circumferential direction, and therefore the circumferential width of the insertion hole is set so that the terminal can be inserted into the corresponding insertion hole as long as the amount of misalignment is within the expected range. However, if guide portions are provided in all insertion holes, other terminals located circumferentially away from the terminal whose position was first corrected may interfere with the guide portions and not be able to be inserted into the insertion holes. Therefore, in this embodiment, of the multiple insertion holes lined up in the circumferential direction around the rotation axis, guide portions are provided only in the insertion holes that are close to a straight line (midpoint C55: see Figure 8) that passes through the midpoint between the insertion hole located at one end in the circumferential direction and the insertion hole located at the other end, as viewed from the rotation axis. That is, a guide portion for positioning one terminal of a terminal pair in the circumferential direction is provided in an insertion hole on both sides of which at least one other insertion hole is located.

[0055] Therefore, even if the jig 5 is displaced in the circumferential direction due to the effect of correcting the terminal position in the insertion hole 55C, the gripping of the terminal 25a in the other insertion holes 55 is not affected.

[0056] If the inclined surface 555a is provided only at one location on the inner periphery, the jig 5 may rotate around the contact point between the terminal 25a and the inclined surface 555a (see arrow d in FIG. 15). Therefore, in this embodiment, guide portions 545 are provided in the insertion holes 54C and 54D of the outer diameter side insertion holes 54. When viewed from the outer diameter side along the axis X, these insertion holes 54C and 54D are located on both sides of the inner diameter side insertion hole 55C having the inner diameter side guide portion 555. As a result, when the jig 5 attempts to rotate based on the contact point between the terminal T and the inclined portion 555A, the guide portion 545 of either of the insertion holes 54C, 54D interferes with the terminal 24a, thereby restricting the rotation of the jig 5.

[0057] As described above, the jig 5 according to an embodiment of the present invention has the following configuration. (1) The jig 5 is used to position a plurality of terminal pairs (terminals 25a and terminals T) arranged in the circumferential direction around the axis X (rotation axis) of the motor M (rotating electric machine). The jig 5 has a main body 50 having a plurality of insertion holes 55 (55A to 55F) for the terminal pairs. When viewed from the direction of the axis X (the direction of the rotation axis), the insertion holes 55 are arranged in the circumferential direction around the axis X. Of the multiple insertion holes 55 lined up in the circumferential direction, insertion hole 55C has at least one other insertion hole 55A, 55B, 55D, 55E, 55F located on both sides in the circumferential direction, and is provided with a guide portion 555 that positions one terminal 25a of the terminal pair in the circumferential direction.

[0058] According to one aspect of the present invention, a plurality of terminal pairs to be welded to each other can be positioned and inserted appropriately into the corresponding insertion holes.

[0059] Before being positioned by the guide portion 555, the terminals 25a are arranged with variations in position in the circumferential direction. Therefore, when the circumferential position of a certain terminal 25a is corrected by the corresponding guide portion 555, the jig 5 may be displaced in the circumferential direction in response to the position correction. At this time, the amount of misalignment of the jig 5 in the circumferential direction increases as the terminals are positioned farther away in the circumferential direction from the terminal whose position was first corrected, because the amount of misalignment accumulates. The circumferential width of the insertion hole is determined based on the circumferential width of the terminal and the average amount of misalignment of the terminal in the circumferential direction, and therefore the circumferential width of the insertion hole is set so that the terminal can be inserted into the corresponding insertion hole as long as the amount of misalignment is within the expected range. However, if guide portions 555 are provided in all of the insertion holes 55 (55A to 55F), other terminals located circumferentially away from the terminal whose position was first corrected may interfere with the guide portions and may not be inserted into the insertion holes. With the above configuration, no guide portion is provided in the insertion hole into which another terminal located adjacent to the terminal whose position has been corrected is inserted, thereby reducing the possibility that another terminal located circumferentially away from the terminal whose position has been corrected initially will not be inserted into the insertion hole.

[0060] (2) In the insertion hole 55, a tool 56 is disposed which is movable forward and backward in the radial direction of the axis X. In the insertion hole 55C, guide portions 555, 555 are provided on a side edge 551 facing the tool 56 in the radial direction. In the insertion hole 55C, the circumferential width Wx of the region where the guide portions 555, 555 are provided is narrower than the circumferential width Wa of the region where no guide portions are provided.

[0061] According to one aspect of the present invention, the positioning of the terminal pair in the radial direction of the axis X can be performed by gripping the terminal pair between the side edge 551 of the insertion hole 55 and the tool 56. At this time, the tool 56, which is displaced in the radial direction of the axis X, guides the one terminal 25a into a region of the guide portions 555, 555, which has a narrow width in the circumferential direction, thereby positioning the one terminal 25a in the circumferential direction. As a result, by moving the tool 56 in the radial direction of the axis X, one terminal 25a constituting the terminal pair can be positioned in the circumferential direction around the axis X (the rotation axis of the motor M) and in the radial direction.

[0062] (I) A recess 561 (tool side guide portion) is provided in the portion of the tool 56 facing the side edge 551 to position the other terminal T, T of the terminal pair in the circumferential direction.

[0063] With this configuration, the tool 56 is displaced in a direction approaching the side edge 551, and the terminal pair (terminal 25a, terminal T) is gripped between the side edge 551 and the recess 561 on the side of the tool 56. As a result, the terminal T is positioned in the circumferential direction and the radial direction around the axis X.

[0064] (3) The through hole 55C provided with the guide portions 555, 555 is, among the multiple through holes 55 arranged in the circumferential direction around the axis X, the through hole that is closest to the intermediate line C55 that passes through the midpoint between the through hole 55A located at one end in the circumferential direction and the through hole 55F located at the other end, as viewed from the axis X.

[0065] According to one aspect of the present invention, when correcting the position of the terminal 25a using the guide portions 555, 555, even if the jig 5 is misaligned to one side or the other in the circumferential direction, the possibility of problems occurring in the circumferential positioning of the terminal 25a in other insertion holes can be reduced. In the embodiment described above, among the multiple insertion holes lined up in the circumferential direction about the axis X, the insertion hole 55C located near the circumferential center is provided with the guide portion 555 for circumferentially positioning the terminal 25a, while the other insertion holes 55A, 55B, 55D, 55E, and 55F are not provided with guide portions. This makes it possible to preferably prevent the other terminals 25A located circumferentially away from the terminal 25a whose position was first corrected from interfering with the insertion hole 55 and not being able to be inserted into the insertion hole 55.

[0066] (4) The through holes include a first row of through holes consisting of a plurality of through holes 55A to 55F arranged circumferentially, and a second row of through holes consisting of a plurality of through holes 54A to 54F arranged circumferentially on the outer diameter side of the first row of through holes in the radial direction of the axis X. When viewed from the axis X, the insertion holes 55A to 55F constituting the first insertion hole row and the insertion holes 54 to 54F constituting the second insertion hole row are positioned alternately in the circumferential direction. In the second insertion hole row, when viewed from the axis X toward the outer diameter side, guide portions 545, 545 are provided in insertion holes 54C, 54D located on both sides of insertion hole 55C in the first insertion hole row in which guide portions 555, 555 are provided.

[0067] When the position of one terminal 25a is corrected by the guide portions 555, 555, the jig 5 may rotate around the contact point between the guide portion 555 and the terminal 25a. According to one embodiment of the present invention, rotation of the jig 5 can be regulated both when an operating force is applied to the jig to rotate it clockwise around the contact point, and when an operating force is applied to rotate it counterclockwise.

[0068] (II) The tool 56 has an engaging portion 571 with which the operator of the drive mechanism simultaneously engages.

[0069] With this configuration, the terminal pairs can be gripped collectively in each of the plurality of insertion holes.

[0070] (5) At the side edge 551 of the insertion hole 55C, A pair of guide portions 555, 555 are provided at an interval in the circumferential direction. The opposing portions of the pair of guide portions 555, 555 in the circumferential direction are inclined surfaces 555a, 555a, with the circumferential separation distance Wx narrowing as they move radially outward from the axis X. At the side edges 541 of the insertion holes 54C and 54D, A pair of guide portions 545, 545 are provided at an interval in the circumferential direction. The opposing portions of the pair of guide portions 545, 545 in the circumferential direction are inclined surfaces 545a, 545a, with the circumferential separation distance Wx narrowing as they move radially outward from the axis X.

[0071] According to one embodiment of the present invention, when the tool 56 is displaced radially, one of the terminals 25a, 25a can be smoothly inserted between the guide portions 555, 555, and one of the terminals 24a, 24a can be smoothly inserted between the guide portions 545, 545.

[0072] In the above embodiment, the guide portions 555, 555 are provided in one of the insertion holes 55C, 55D that is closest to the intermediate line C55. The other insertion hole 55D may be provided with guide portions 555, 555.

[0073] In the above embodiment, the total number of insertion holes arranged in the circumferential direction is six (an even number), but the total number of insertion holes may be an odd number. For example, when five insertion holes 55 (55A to 55E) are arranged in the circumferential direction, the above-mentioned guide portions 555, 555 are provided in insertion hole 55C located on a straight line passing through the midpoint between insertion hole 55A located at one end in the circumferential direction and insertion hole 55E located at the other end. This provides the same effects as those in the above-described embodiment.

[0074] In the above embodiment, a guide portion is provided in one of the insertion holes included in the inner diameter side insertion hole row, and guide portions are provided in two of the insertion holes included in the outer diameter side insertion hole row. A guide portion may be provided in one of the insertion holes included in the row of insertion holes on the outer diameter side, and guide portions may be provided in two of the insertion holes included in the row of insertion holes on the inner diameter side. In this case, by arranging insertion holes provided with inner diameter side guide portions on both sides of one insertion hole provided with an outer diameter side guide portion as viewed from the axis X, the same effects as those in the above-described embodiment can be achieved.

[0075] In the above-described embodiment, the movement of the tools 56 is exemplified by an actuator driven by air pressure or hydraulic pressure. For example, a screw feed mechanism may be configured in which a screw thread is provided on the outer periphery of the shaft member 57 extending from the tool 56 and a screw groove is provided on the inner periphery of the support hole 521 in the support part 52, and the individual tools 56 may be moved by the screw feed mechanism. The drive mechanism for moving the tools 56 can be changed as appropriate. [Explanation of symbols]

[0076] M motor (rotating electric machine) X-axis (rotation axis) 5 Jig 54 (54A to 54F) Insertion holes (first insertion hole row) 541 Side edge 541a Slope 545 Guide part 55 (55A to 55F) Insertion hole (second insertion hole row) 551 Side edge 551a Slope 555 Guide part 56 Tools 561 Recess (tool side guide part) 545, 555 guide part 24a, 25a, T terminal (terminal pair)

Claims

1. A jig used to position a plurality of terminal pairs arranged in a circumferential direction around a rotation axis of a rotating electric machine, The jig is A plurality of insertion holes for the terminal pairs are provided, When viewed from the rotation axis direction, the insertion holes are aligned in a circumferential direction around the rotation axis, A jig in which a guide portion for positioning one terminal of the terminal pair in the circumferential direction is provided in an insertion hole, among the plurality of insertion holes lined up in the circumferential direction, that has at least one other insertion hole located on both sides in the circumferential direction.

2. In claim 1, a tool that is movable forward and backward in a radial direction of the rotation shaft is disposed in the insertion hole; the insertion hole provided with the guide portion is provided on a side edge facing the tool in the radial direction, In the insertion hole, the width in the circumferential direction of a region where the guide portion is provided is narrower than the width in the circumferential direction of a region where the guide portion is not provided.

3. In claim 2, The through hole provided with the guide portion is, among a plurality of through holes lined up in a circumferential direction around the rotation axis, a through hole that is located on a straight line passing through a midpoint between a through hole located at one end in the circumferential direction and a through hole located at the other end, as viewed from the rotation axis, or a through hole close to the straight line.

4. In claim 3, the insertion holes include a first insertion hole row consisting of a plurality of insertion holes lined up in the circumferential direction, and a second insertion hole row consisting of a plurality of insertion holes lined up in the circumferential direction, the second insertion hole row being located on an outer diameter side of the first insertion hole row in the radial direction of the rotation shaft, When viewed from the rotation axis, the insertion holes constituting the first insertion hole row and the insertion holes constituting the second insertion hole row are alternately positioned in the circumferential direction, In the second row of insertion holes, guide portions are provided in the insertion holes located on both sides of the insertion hole in the first row of insertion holes in which the guide portions are provided, as viewed from the rotation axis.

5. In any one of claims 2 to 4, At the side edge of the insertion hole, A pair of the guide portions are provided at intervals in the circumferential direction, The opposing portions of the pair of guide portions in the circumferential direction form inclined surfaces whose circumferential separation distance becomes narrower as they move radially outward from the rotating shaft.

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