JP2013046497A - Concentrated power distribution member of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent corotation of a feeding terminal when a power supply side terminal is connected to the feeding terminal by bolt tightening.SOLUTION: There is provided a concentrated power distribution member S for supplying power to a winding of a stator of a motor, in which a plurality of annular bus bars 10 each including a feeding terminal 20 and connection terminals 30 with the winding are laminated and stored in a holder 50 made of a synthetic resin so as to be insulated from each other, and power supply side terminals 91 drawn from a power supply side are individually laminated and connected to the feeding terminals 20 of the bus bars 10 by being tightened by bolts 95, respectively. The holder 50 includes terminal blocks 55 each capable of mounting the feeding terminal 20 and each having a nut 65 to be screwed with the bolt 95, attached thereto so as to be prevented from rotating. A back face of the terminal block 55 has an insertion groove 88 formed therein as a corotation prevention part into which an overhang part 27 formed in a side edge of a longitudinal plate 22 of the feeding terminal 20 is inserted.

Description

  The present invention relates to a central power distribution member of a motor.

For example, in a vehicular brushless motor in which a rotor is surrounded by a ring-shaped stator, the stator includes a plurality of magnetic poles formed of windings and a concentrated power distribution member that forms an annular shape for supplying power to the magnetic poles. Conventionally, as an example of such a concentrated power distribution member, one disclosed in Patent Document 1 below is known.
This is provided with three bus rings in which a magnet wire is bent into a polygonal ring, and each bus ring is formed with a plurality of connecting portions connected to the winding at intervals in the circumferential direction. The feeding terminals are caulked and fixed to the end portions where the wires are butted, and the three bus rings are concentrically overlapped with each other so that the respective feeding terminals are displaced in the circumferential direction, and at a plurality of locations along the circumferential direction. It is a structure assembled integrally by sandwiching from inside and outside in the radial direction with a synthetic resin clip. And the terminal metal fitting (power supply side terminal) pulled out from the power supply side is connected and used for the electric power feeding terminal of each bus ring.

JP 2009-261094 A

Here, as means for connecting the power supply side terminal to the power supply terminal of each bus ring, both terminals are overlapped and fastened with bolts and nuts. Specifically, after inserting a bolt through the insertion hole provided in both terminals and screwing a nut into its protruding end, one of the nut and the bolt is locked and the other is screwed with a tool. ing.
However, when tightening with bolts and nuts in this way, the power supply terminal rotates with the tightening, a load is applied to the bus ring side, the sheath of the magnet wire constituting the bus ring is broken, or the clip is damaged There was a fear that it was necessary to take measures.
The present invention has been completed based on the above circumstances, and its purpose is to prevent the power supply terminal from being rotated when the power supply side terminal is bolted to the power supply terminal. is there.

  The present invention is a concentrated power distribution member for supplying electric power to a winding of a stator of a motor, and a plurality of annular bus bars each having a power feeding terminal and a connection terminal to the winding are insulated from each other. In this form, it is housed by being stacked in a synthetic resin holder, and the power supply side terminals drawn from the power supply side are individually stacked on the power supply terminals of each bus bar and are connected by bolting. The holder is characterized in that a follow-up preventing portion is formed that is locked to the proximal end side of the power supply terminal and restricts the power supply terminal from being rotated as the bolt is tightened. .

  When the other power supply side terminal is overlapped with the power supply terminal and bolted, it is restricted that the base end side of the power supply terminal is locked by the rotation preventing portion formed on the holder. Therefore, it is possible to prevent a load from being applied to a portion of the bus bar where the power supply terminal is provided, and to prevent deformation, breakage, and the like.

The following configuration may also be used.
(1) The holder is provided with a terminal block on which the power feeding terminal can be placed and a nut to be screwed with the bolt is mounted to prevent rotation, and the follower prevention portion is formed on the terminal block. Has been.
When connecting the power supply terminal to the power supply terminal on the other end, simply connect the power supply terminal to the power supply terminal on the terminal block, and then connect the two terminals simply by passing the bolts through both terminals and screwing them into the nuts. be able to. At that time, it is restricted that the power feeding terminal is engaged with the accompanying rotation preventing portion provided on the terminal block.

(2) The power supply terminal is formed in a crank shape in which a vertical plate rises at a front end of a substrate protruding in a radial direction from the bus bar, and a connection plate is bent at a right angle at the front end of the vertical plate. The connecting plate is placed on the upper surface of the terminal block while keeping the vertical plate along the back surface of the terminal block, and the vertical plate of the power supply terminal is placed on the back surface of the terminal block. The follow-up preventing portion is formed by forming insertion grooves into which both side edges of the frame are inserted from above.
As the connection plate of the power supply terminal is placed on the upper surface of the terminal block, both side edges of the vertical plate are inserted from above into the insertion groove provided on the back surface of the terminal block, and this makes the power supply terminal together with the power supply side terminal. When the bolt is tightened, the power feeding terminal is restricted from being rotated.

  ADVANTAGE OF THE INVENTION According to this invention, when connecting a power supply side terminal to a power supply terminal by bolting, it can prevent that a power supply terminal rotates.

1 is an exploded perspective view of a concentrated power distribution member according to an embodiment of the present invention. Top view of the busbar body Top view of bus bar AA line sectional view of FIG. BB sectional view of FIG. Side view of connection terminal Plan view Rear view The perspective view which shows the arrangement structure of a three-layer bus bar Plan view Top view of insulation plate Top view of holder Exploded sectional view showing the structure of the part where the power supply terminal is assembled to the terminal block Top view of cover Front view Side view Front view with nuts attached to terminal block Partially cutaway plan view when the power supply terminal is placed on the terminal block Rear view showing the back of the terminal block Plan view of assembled state of centralized power distribution member CC sectional view of FIG. DD sectional view of FIG. EE sectional view of FIG.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
The motor of the present embodiment is a three-phase AC six-pole brushless motor mounted on a hybrid electric vehicle, is disposed in a narrow space between the engine and the transmission, and is coaxially connected to the horizontal crankshaft of the engine. A rotor (not shown), a ring-shaped stator (not shown) concentrically surrounding the rotor, and a ring-shaped concentrated power distribution member S surrounding the stator concentrically. The stator is composed of a plurality of magnetic poles (not shown) formed by winding the core, and the magnetic poles are arranged at a constant pitch along a circumference concentric with the rotor. Both ends of the winding are derived.

  The central power distribution member S is for supplying electric power to the winding of the stator, and as shown in FIG. 1, the three bus bars 10, the two insulating plates 40, and these are stacked and accommodated. Holder 50 and five covers 70 to be attached to the opening surface of the holder 50. Further, each bus bar 10 is provided with one power supply terminal 20 and connection terminals 30 for six windings.

  Each component will be described. In the bus bar 10, the bus bar main body 11, the power supply terminal 20 and the connection terminal 30 are formed separately in advance. As shown in FIGS. 2 and 4, the bus bar body 11 has a regular octagonal shape when the belt-shaped base material 12 having a square cross section is bent in the width direction at a predetermined angle (160 °) for each predetermined length. It is formed in an annular shape. However, of the 18 sides of the regular octagon, 2 sides on the end side are cut off, and the remaining 1 side of the end side is held to a short length of about 1/3 of the normal length.

  More specifically, the strip-shaped base material 12 of the bus bar body 11 is formed by drawing or rolling a metal wire, or cutting a metal flat plate into a predetermined width. However, by being bent at an angle of 160 °, it is formed into a regular octagonal ring with a part of the side missing as described above. As described above, when the polygonal shape (regular octagonal) is bent and formed, the shape accuracy can be increased, that is, a perfect circle can be easily formed, compared to the case where the belt-shaped substrate 12 is bent and formed in an annular shape in the width direction. There is an advantage.

  The power supply terminal 20 is provided at a terminal of a power supply wire 90 drawn from the power supply side, or is connected to a power supply side terminal 91 (see FIG. 13) made of an LA terminal or the like by tightening bolts 95. One for the bus bar 10 is provided. The power supply terminal 20 is formed by pressing a metal flat plate having a thickness substantially equal to the thickness of the bus bar main body 11 and performing predetermined punching, bending, and the like. As shown, it is formed so that it is wide and has a crank shape when viewed from the side.

  More specifically, the vertical plate 22 rises from the tip of the mounting plate 21, and the connection plate 23 is bent at a right angle from the upper end of the vertical plate 22. The mounting plate 21 has a first joint concave surface 24 that is a welded portion formed on the lower surface on the base end side in a step shape, and the first joint concave surface 24 is slightly smaller than the width of the strip-shaped base material 12 that constitutes the bus bar body 11. In addition to having a small depth dimension, it is formed at a position having a depth dimension that is about half the thickness of the band-shaped substrate 12.

As shown in FIG. 19, overhanging portions 27 are formed on both side edges of the vertical plate 22 so as to protrude by a predetermined dimension at a substantially central height position.
A bolt insertion hole 25 is opened in the connection plate 23, and as shown in FIG. 9, a pair of locking claws 26 functioning to prevent a nut 65, which will be described later, are formed downward from both ends of the leading edge. Has been.

  The connection terminal 30 is formed by pressing the same metal flat plate as the material of the power supply terminal 20 and performing predetermined punching, bending, etc., as shown in FIGS. Further, a vertical plate 32 rises from the tip of the mounting plate 31, and a connection plate 33 is formed in a folded shape from one side edge of the vertical plate 32 so as to connect the end of the winding. A second joint concave surface 34 that is also a welded portion is formed on the lower surface of the base plate side of the mounting plate 31. The depth dimension and depth dimension of the second joint concave surface 34 are also the same as those of the first joint concave surface 24 of the mounting plate 21 of the power supply terminal 20 described above.

  One power supply terminal 20 and six connection terminals 30 are assembled to the bus bar main body 11. Specifically, as shown in FIG. 3, the power feeding terminal 20 is arranged in the center in the length direction of the ninth edge portion 13IX from the start end side in the bus bar main body 11 with the connection plate 23 facing outward, As shown in FIG. 4, the first joining concave surface 24 of the mounting plate 21 is joined by resistance welding in a state where the first joining concave surface 24 is fitted to the upper surface of the edge portion 13IX. In the following description, the position of the edge portion of the bus bar main body 11 is identified by adding a suffix “13” when specifying the position thereof, and when not distinguished, the reference numeral “13” is added.

As shown in FIG. 3, the connection terminal 30 is located at the start end side of the first, fourth, seventh, tenth and thirteenth edge portions 13I, 13IV, 13VII, 13X and 13XIII from the start end side in the bus bar body 11, and the terminal end. 6 are arranged in such a posture that the connection plate 33 faces inward, and the second joining concave surface 34 of the mounting plate 31 is provided on the edge portion 13 as shown in FIG. In the state of being fitted on the upper surface of each other, they are also joined by resistance welding.
Three bus bars 10 having the same shape are provided.

  As described in detail later, the above-mentioned three bus bars 10 are stacked on the same axis in a form in which the rotation posture is shifted by 20 ° (see FIG. 9). As shown in the figure, a regular octagonal ring is formed in which only a part of one edge is missing (missing portion 14). Then, a total of 18 connection terminals 30 provided on each bus bar 10 are arranged at equal angular intervals of 20 ° on the same circumference. In addition, the power supply terminals 20a to 20c of each bus bar 10 are arranged together with an angular interval of 20 ° at substantially the opposite side of the ring-shaped missing portion 14 from the center. Yes.

Insulating plates 40 are interposed between the bus bars 10 arranged in a stacked manner as described above. The insulating plate 40 is made of synthetic resin, and as shown in FIG. 11, the insulating plate 40 is formed in a regular octagonal complete (no missing portion) ring with the same diameter as the bus bar body 11. The insulating plate 40 is wider than the bus bar body 11 and has a thickness about twice that of the bus bar body 11.
A fitting groove 41 capable of fitting the bus bar main body 11 almost tightly and flush with each other is formed at the center in the width direction on the upper surface of the insulating plate 40.

  As described above, each insulating plate 40 is interposed between each of the three bus bars 10, but on the upper surface side of the insulating plate 40, as shown in FIGS. In each of the edge portions 43 corresponding to the six connection terminals 30 coupled to the bus bar 10, an inner relief for fitting the lower half of the attachment plate 31 of the connection terminal 30 to the side wall on the inner peripheral side of the fitting groove 41 and releasing it. A groove 45 is formed in a notch, and a predetermined one edge portion 43a has a mounting plate for the power supply terminal 20 coupled to the bus bar 10 disposed on the upper side wall of the fitting groove 41 on the outer peripheral side wall. An outer relief groove 46 is formed in which the lower half of 21 is fitted and escaped.

  Further, on the lower surface side of the insulating plate 40, as shown in FIG. 23, the connection terminals 30 are attached at the respective edge portions 43 corresponding to the six connection terminals 30 coupled to the bus bar 10 disposed on the lower side. An inner escape recess 47 is formed in which the upper half of the plate 31 is fitted and escaped, and at a predetermined one edge portion 43a, as shown in FIG. 13 and FIG. An escape recess 48 is formed in which the upper half of the attachment plate 21 of the coupled power supply terminal 20 is fitted and released.

The holder 50 is made of a synthetic resin, and is formed in a regular octagonal complete annular shape having the same diameter as the bus bar body 11 as shown in FIG. The holder 50 is formed with a holding groove 51 having an opening on the upper surface. In the holding groove 51, three bus bars 10 and two insulating plates 40 are alternately laminated (as appropriate, a laminated body). 89) and is held.
As shown in FIG. 13, the groove 50 in the holding groove 51 of the holder 50 is formed with a fitting groove 52 that can fit the bus bar body 11 in the lowermost bus bar 10 almost tightly and flush with each other.

  On the inner side wall of the holding groove 51 in each predetermined edge portion 53 of the holder 50, vertical grooves 54a to 54c into which the mounting plates 31 of the connection terminals 30 provided on the bus bars 10 of the respective layers are inserted from above are formed. Yes. The vertical grooves 54a to 54c are formed in three stages in depth corresponding to the three positions of the connection terminal 30 in height.

  Terminal blocks 55a to 55c that respectively receive power supply terminals 20a to 20c provided on the bus bars 10 of the respective layers are formed on the outer surfaces of adjacent three adjacent edge portions 53a to 53c of the holder 50 so as to protrude outward. . The terminal blocks 55a to 55c can receive the connection plate 23 from the vertical plate 22 of the power supply terminal 20, and the height of the power supply terminal 20 is three levels corresponding to the three positions. It is formed separately. In the following description, when the description is common to the terminal blocks 55a to 55c, the terminal block 55 may be simply described.

Each terminal block 55 is formed with a nut mounting groove 56 that is open on the upper surface and the protruding end surface. The nut mounting groove 56 is mounted with a nut 65 being prevented from rotating.
As shown in FIGS. 1 and 18, the nut 65 has a rectangular shape, and a flange 66 is formed to protrude over the entire length in the lower half of the left and right side surfaces. As shown in FIG. 17, the flange 66 has an inclined surface 66c in which a side surface 66b hangs at a right angle from a projecting end of a horizontally projecting upper surface 66a, and a lower end portion of the flange 66 gradually narrows downward. It is formed in a front shape.

  On the other hand, as a whole, the nut mounting groove 56 has a depth that is a predetermined dimension larger than the length of the nut 65 in the front-rear direction, a depth that is slightly smaller than the thickness of the nut 65, and between the side surfaces 66 b of both flanges 66 of the nut 65. It is formed into a channel shape having a width larger than the dimension by a predetermined dimension. As will be described later, at the center position in the depth direction at the groove bottom of the nut mounting groove 56, an escape hole 58 is opened for inserting and releasing the tip of the shaft portion 95a of the bolt 95 screwed into the nut 65. .

At the upper end portions of the left and right inner wall surfaces of the nut mounting groove 56, locking portions 80 that are locked to the upper surface 66a of the flange 66 of the nut 65 are mutually connected in a region extending from a position slightly inward from the protruding end to the inner surface. Protrusions are formed so as to face each other. An upper surface opening groove 81 that allows the upper end portion of the nut 65 to be inserted upward is formed between the opposing surfaces of the both locking portions 80. The width of the upper surface opening groove 81 is formed to be larger than the width of the upper end portion of the nut 65, so that the upper end portion of the nut 65 is inserted with a clearance with respect to the upper surface opening groove 81 of the nut mounting groove 56. It is possible.
Guide protrusions 83 are formed at the lower left and right corners of the opening (entrance 82) on the protruding end side of the nut mounting groove 56. The opposing surface of the guide protrusion 83 is inclined by the flange 66 of the nut 65. An inclined surface having an angle following the surface 66c is formed, and both the inclined surfaces 66c of the flange 66 of the nut 65 can be inserted between the opposing surfaces of the both guide protrusions 83 with a clearance.

  In other words, the nut 65 is straightened by passing between the guide protrusions 83, the left and right flanges 66 are passed under the locking portions 80, and the upper end portion is passed through the upper surface opening groove 81. However, it can be inserted into the nut mounting groove 56 from the inlet 82. After the insertion, the left and right flanges 66 are locked to the locking portions 80, so that the nut 65 is prevented from coming off above the nut mounting groove 56. A clearance is secured between the side surface 66b of both flanges 66 and the inner surface of the nut mounting groove 56 (including the inner surface of the guide protrusion 83), and the width of the upper surface opening groove 81 is the same as that of the upper end of the nut 65. Coupled with being wider than the width in the left-right direction, the nut 65 is accommodated in the nut mounting groove 56 so as to be movable in the width direction and the depth direction.

As described above, the vertical plate 22 of the power supply terminal 20 is arranged along the back surface of the terminal block 55.
As shown in FIG. 13, a mounting recess 85 into which the vertical plate 22 of the power supply terminal 20 can be inserted from above is formed on the back surface of the terminal block 55 so as to open to the front side (left side in the figure). . Specifically, as shown in FIG. 18, the mounting recess 85 is such that the distance between the left and right side walls 85 a is a dimension between both protruding edges of the protruding portion 27 formed on both side edges of the vertical plate 22 of the power supply terminal 20. And a bottom wall 85b capable of receiving a connecting portion between the lower end of the vertical plate 22 and the mounting plate 21.

On the opening end side of the left and right side walls 85a, a prismatic part 86 is formed to rise from the bottom wall 85b toward a position slightly below the upper edge. An interval comparable to the plate thickness of the vertical plate 22 is provided between the rectangular column part 86 and the back wall 87, and thus, the tension of the vertical plate 22 is provided between both the rectangular column part 86 and the back wall 87. An insertion groove 88 for inserting and locking the protruding portion 27 is formed.
Tapered guiding surfaces 86a and 87a are formed at the upper end of both prismatic column portions 86 and the upper end of the back wall 87 of the mounting recess 85, respectively.

Five covers 70 are attached to the upper surface opening of the holder 50, and as shown in FIGS. 12 and 20, a central terminal block 55 b is formed in the edge 53 of the holder 50. It is attached to a total of five places, that is, the edge portion 53 and two edge portions 53 that are opened on the both sides from the edge portion 53 (attachment position 60).
The cover 70 is made of synthetic resin. As shown in FIGS. 14 to 16, as shown in FIGS. 14 to 16, the cover 70 is attached to both ends of the linear portion 71 so as to cover a part of the adjacent edge portion 53 from one edge portion 53 of the holder 50. This is a shape in which a short bent portion 72 is provided.

Each cover 70 is formed with a total of four elastically displaceable lock frame pieces 73 downward on the outer edge side and two on the inner edge side. The two lock frame pieces 73a on the outer edge side are formed at positions close to both ends of the straight portion 71, and the two lock frame pieces 73b on the inner edge side are formed at the connecting portion between the straight portion 71 and the bent portion 72. Has been.
On the other hand, at each attachment position 60 of the cover 70 in the holder 50, there are a total of four lock projections 61 that are fitted and locked to the lock frame pieces 73a and 73b, two on the outer surface side and two on the inner surface side. Is formed. The two lock projections 61 on the outer surface side are formed at positions close to both ends of the one edge portion 53, and the two lock projections 61 on the inner surface side are the edge portions 53 adjacent to the one edge portion 53. 53 is formed at each of the bent joints between the two.

The inner edge side lock frame piece 73b is inserted into a valley portion having an obtuse angle in plan view, such as a connecting portion between one edge portion 53 and both adjacent edge portions 53 in the holder 50. The inner surface of the lock frame piece 73b is formed in a mountain shape that matches the valley shape described above.
Further, guides 62 for inserting and guiding the lock frame piece 73a are formed on both sides of the lock projection 61 on the outer surface side.

  A pressing plate 75 that elastically presses the upper surface of the laminated body 89 fitted in the holding groove 51 of the holder 50 is formed at the central portion in the length direction of the linear portion 71 of the cover 70. The pressing plate 75 has a long and narrow shape along the length direction of the straight portion 71 and is cut and formed in a double-sided manner. The central portion in the length direction can be bent and deformed in the vertical direction. A pressing protrusion 76 is formed along the width direction on the lower surface of the central portion of the plate 75 in the length direction.

Then, an example of the assembly procedure of the concentrated power distribution member S according to the present embodiment will be described.
As for the bus bar 10, as described above, one connection terminal 20 is placed in a predetermined position on the bus bar body 11 formed in a regular octagonal annular shape with a part missing, and six connections are made in an outward posture. The terminals 30 are respectively arranged in an inward posture and are joined by resistance welding. The bus bar body 11 has a square cross section, and the first joint concave surface 24 of the mounting plate 21 of the power supply terminal 20 and the second joint concave surface 34 of the mounting plate 31 of the connection terminal 30 are formed on the planar upper surface of the bus bar main body 11. On the other hand, it is possible to perform welding joint with a highly accurate posture determined by being able to join with a sticky contact, that is, with a large contact area.

In assembling, three bus bars 10 as described above, two insulating plates 40, a holder 50, and five covers 70 are prepared.
First, the holder 50 is installed on the assembly table. For example, as shown in FIG. 1, the three terminal blocks 55a to 55c are installed in a posture facing the front side. As shown in FIGS. 13 and 17, the nut 65 is inserted into the nut mounting groove 56 of each of the terminal blocks 55 a to 55 c from the inlet 82 in the nut mounting groove 56 while passing the left and right flanges 66 under the locking portion 80. Inserted into. The nut 65 is mounted in the nut mounting groove 56 in the form of being prevented from rotating, and the left and right flanges 66 are locked to the locking portions 80, so that the nut 65 is detached from the upper surface opening groove 81 of the nut mounting groove 56. Is regulated. However, the nut 65 is accommodated in the nut mounting groove 56 so as to be movable forward and backward and left and right.

From this state, the bus bar 10 that comes to the lower layer of the three layers with respect to the holding groove 51 of the holder 50 has a predetermined rotation posture, that is, the power supply terminal 20a provided on the bus bar 10 is the holder shown in FIG. 50 is inserted in a turning posture coming right above the rightmost terminal block 55a as viewed from the front side.
The bus bar 10 is inserted while the six inward connection terminals 30 are inserted into the deepest vertical groove 54 a while being released, and the bus bar body 11 is flush with the fitting groove 42 at the bottom of the holding groove 51. Fitted.

In addition, the connection plate 23 of the power supply terminal 20a provided outwardly on the bus bar 10 is placed on the rightmost terminal block 55a. As shown in FIG. 13, the power supply terminal 20 a is pushed into the vertical plate 22 along the inner wall 87 of the mounting recess 85 while inserting the left and right protruding portions 27 into the corresponding insertion grooves 88. It is. At this time, by being guided by the guiding surfaces 86a and 87a, the protruding portion 27 of the vertical plate 22 is smoothly inserted into the insertion groove 88.
When the predetermined amount is pushed, the connection plate 23 is mounted on the nut mounting groove 56 and placed on the upper surface of the nut 65 slightly protruding from the upper surface opening groove 81, and the bolt insertion hole 25 of the connection plate 23 is the female screw of the nut 65. It substantially matches with 65a. At the same time, the engaging claw 26 at the tip of the connection plate 23 is configured to block both the left and right ends of the inlet 82 of the nut mounting groove 56, and the nut 65 is restricted from coming out of the inlet 82.

  Next, the lower insulating plate 40 has a predetermined rotational posture, that is, the rotational posture in which the escape recess 48 formed on the lower surface of the insulating plate 40 comes directly above the power supply terminal 20a of the bus bar 10 previously inserted. Is taken and inserted. The insulating plate 40 is fitted with the mounting plate 21 of the power supply terminal 20a in the outer relief recess 48 on the lower surface, and the six inner escape recesses 47 also formed on the lower surface are attached to the corresponding mounting plates 31 of the connection terminals 30. As shown in FIGS. 21 to 23, the lower surface is placed in close contact with the groove bottom of the holding groove 51.

Subsequently, the intermediate layer bus bar 10 has a predetermined rotation posture, that is, the rotation posture in which the power supply terminal 20b provided on the bus bar 10 comes directly above the central terminal block 55b in the holder 50 shown in FIG. Taken and inserted.
The bus bar 10 is inserted while the six inward connection terminals 30 are fitted into the longitudinal grooves 54b of the intermediate depth and escaped, and the bus bar main body 11 is inserted on the upper surface of the insulating plate 40 inserted on the lower surface side thereof. As shown in FIG. 13, the connection plate 23 of the power supply terminal 20b is placed on the central terminal block 55b.

  Similarly, the power supply terminal 20b is pushed along the back wall 87 of the mounting recess 85 while the vertical plate 22 is inserted into the corresponding insertion groove 88 with the left and right protruding portions 27 being inserted, and the connection plate 23 is The bolt insertion hole 25 is placed on the protruding upper surface of the nut 65 mounted in the nut mounting groove 56, and is in a state of being substantially aligned with the female screw 65a of the nut 65. At the same time, the locking claw 26 at the tip of the connection plate 23 closes both left and right ends of the inlet 82 of the nut mounting groove 56 to prevent the nut 65 from coming off.

  Next, as with the lower insulating plate 40, the upper insulating plate 40 turns the escape recess 48 formed on the lower surface directly above the power supply terminal 20b of the inserted bus bar 10 in the intermediate layer. It is inserted taking a posture. The insulating plate 40 escapes by fitting the attachment plate 21 of the power supply terminal 20b into the outer relief recess 48 on the lower surface, and fitting the attachment plate 31 of the corresponding connection terminal 30 into the six inner relief recesses 47, As shown in FIGS. 21 to 23, the lower surface is placed in close contact with the upper surface of the lower insulating plate 40 with the bus bar body 11 in between.

After that, the bus bar 10 in the upper layer is inserted in a rotating posture in which the power supply terminal 20c provided on the bus bar 10 comes directly above the left terminal block 55c in the holder 50 shown in FIG. .
The bus bar 10 is inserted while the six inward connection terminals 30 are fitted into the vertical grooves 54c having the minimum depth and are escaped, and the bus bar body 11 is inserted into the lower insulating plate 40. The fitting plate 41 is flush with the fitting groove 41, and the connection plate 23 of the power supply terminal 20c is placed on the terminal block 55c on the left side.

Similarly, in the power supply terminal 20c, the vertical plate 22 is pushed in along the inner wall 87 of the mounting recess 85 while inserting the left and right projecting portions 27 into the corresponding insertion grooves 88, and the connection plate 23 is The bolt insertion hole 25 is placed on the protruding upper surface of the nut 65 mounted in the nut mounting groove 56, and is in a state of being substantially aligned with the female screw 65a of the nut 65. At the same time, the nut 65 is prevented from coming off by the locking claw 26 at the tip of the connection plate 23.
As described above, the laminated body 89 in which the three bus bars 10 and the two insulating plates 40 are alternately laminated is configured, and the laminated body 89 is accommodated in the holding groove 51 of the holder 50.

Finally, the cover 70 is attached to each of five predetermined attachment positions 60 in the upper surface opening of the holder 50. Each cover 70 is pushed in while the inner and outer lock frame pieces 73 are applied to the corresponding lock protrusions 61 while being bent and displaced, and when the cover 70 hits the upper end of the side edge of the holding groove 51, the lock frame piece 73 is moved backward. By being fitted to the lock protrusion 61, it is prevented from coming off and attached. At the same time, the pressing protrusion 76 provided on the pressing plate 75 of each cover 70 elastically presses the upper surface of the laminated body 89, and the laminated body 89 is pressed against the groove bottom of the holding groove 51. As a result, the laminated body 89 is accommodated in a state of being firmly held in the holding groove 51.
Thereby, the assembly of the concentrated power distribution member S is completed.

  The concentrated power distribution member S assembled as described above is disposed around the stator in the brushless motor and is connected to the connection plate 33 of the 18 connection terminals 30 provided on the inner peripheral side of the concentrated power distribution member S. One end of the corresponding winding provided on the stator is connected by fusing or the like. The other end of each winding is connected to a common conductive member for each phase.

On the other hand, on the three terminal blocks 55 a to 55 c collectively provided on the outer peripheral side of the concentrated power distribution member S, the power supply side terminals 91 provided at the terminals of the corresponding power supply wires 90 are overlapped and fixed with bolts 95. Is done.
Taking the central terminal block 55b as an example, as shown in FIG. 22, the connection plate 23 of the power supply terminal 20b is placed on the upper surface of the terminal block 55b, in fact, the nut mounting groove 56 of the terminal block 55b. The corresponding power supply side terminal 91 is overlaid on the connection plate 23 with the bolt insertion holes 25 and 92 aligned with each other.

Subsequently, the bolt 95 is inserted through the bolt insertion holes 25 and 92 of the terminals 20 b and 91 on which the bolts 95 are overlapped, and screwed into the nut 65. At this time, even if the bolt insertion holes 25 and 92 of the power supply terminal 20 b and the power supply side terminal 91 are misaligned with the female screw 65 a of the nut 65, the nut 65 moves back and forth and right and left within the nut mounting groove 56. The bolts 95 are screwed together while being aligned.
After that, when the bolt 95 is turned in the tightening direction using a tool or the like, the nut 65 is tightened smoothly by being prevented from rotating, and the connection plate 23 of the power supply terminal 20b and the power supply side terminal 91 of the other party are connected to each other. As a result, the power supply terminal 20b and the counterpart power supply side terminal 91 are electrically connected.

There is a possibility that the power supply terminal 20b is rotated by frictional engagement during the tightening operation of the bolt 95 described above, but the overhang portions 27 formed on both side edges of the vertical plate 22 of the power supply terminal 20b are inserted. Since the longitudinal plate 22 is inserted in the groove 88 almost tightly in the width direction, the vertical plate 22 is prevented from moving in the width direction, that is, the feeding terminal 20 is not rotated.
Therefore, it is possible to prevent the welded portion from being broken due to a load being applied to the welded portion of the mounting plate 21 of the power supply terminal 20b to the bus bar body 11.

  The other power supply terminals 20a and 20c are similarly mounted on the corresponding terminal blocks 55a and 55c. After the mating power supply side terminals 91 are stacked, the bolts 95 are passed through in the same manner as described above. Then, by screwing and tightening the nuts 65 mounted on the terminal blocks 55a and 55c, the power supply terminals 20a and 20c can be connected to the counterpart power supply side terminal 91. Further, the accompanying rotation of the power supply terminals 20a and 20c is similarly prevented.

  As described above, in the present embodiment, the terminal block 55 in which the nut 65 is prevented from being attached to the holder 50 that accommodates the bus bar 10 is provided, and the power supply terminal 20 provided in each bus bar 10 includes the vertical plate 22. Since the connection plate 23 is assembled in a form that is placed on the upper surface of the terminal block 55 while keeping the terminal block 55 along the back surface of the terminal block 55, when connecting the power supply terminal 20 to the other power source side terminal 91, the terminal block After the power supply side terminal 91 is overlapped on the power supply terminal 20 placed on 55, the bolts 95 are passed through the terminals 20 and 91 and screwed into the nut 65, so that the connection work can be performed easily.

  Here, the structure of the portion where the power supply terminal 20 is placed on the terminal block 55 is provided with the protruding portions 27 on both side edges of the vertical plate 22, while the protruding portion 27 is arranged in the width direction on the back surface of the terminal block 55. An insertion groove 88 that fits tightly is formed, and a follow-up prevention portion that restricts the movement of the vertical plate 22 in the width direction is formed. Therefore, when the power supply terminal 20 tries to rotate by frictional engagement with the tightening operation of the bolt 95, the power supply terminal 20 is prevented from being rotated by the function of the rotation preventing portion. Therefore, it is possible to prevent the welded portion from being broken due to a load applied to the welded portion of the mounting plate 21 of the power supply terminal 20 to the bus bar body 11.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The present invention can also be applied to a type in which a power supply terminal and a power supply side terminal are directly fastened with bolts and nuts without providing a terminal block. What is necessary is just to form the mechanism part which latches to the base end side of this, and prevents accompanying rotation.
(2) In the above embodiment, the power supply terminal is formed separately from the bus bar main body and illustrated as a retrofitted form, but when using a bus bar in which the power supply terminal is formed integrally with the bus bar main body, The present invention is equally applicable.
(3) In the above embodiment, the case where the number of bus bars, that is, the number of power supply terminals is three is exemplified, but the present invention can also be applied to the case where the number of bus bars (power supply terminals) is two or four or more.

S ... Concentrated power distribution member 10 ... Bus bar 11 ... Bus bar body 20, 20a, 20b, 20c ... Power supply terminal 21 ... Mounting plate (board)
DESCRIPTION OF SYMBOLS 22 ... Vertical plate 23 ... Connection board 25 ... Bolt insertion hole 27 ... Overhang | projection part 30 ... Connection terminal 40 ... Insulation board 50 ... Holder 55, 55a, 55b, 55c ... Terminal block 65 ... Nut 85 ... Mounting recessed part 86 ... Square column part 87 ... Back wall (of mounting recess 85) 88 ... Insertion groove (rotation prevention part)
91 ... Power supply side terminal 92 ... Bolt insertion hole 95 ... Bolt

Claims (3)

A concentrated power distribution member for supplying power to the stator windings of the motor,
A plurality of annular bus bars each having a power supply terminal and a connection terminal for the winding are stacked and housed in a synthetic resin holder in an insulated form from each other, and are connected to the power supply terminals of the bus bars. The power supply side terminals pulled out from the power supply side are individually stacked and connected by bolting,
The motor is characterized in that the holder is formed with a follow-up preventing portion that is locked to the proximal end side of the power supply terminal and restricts the power supply terminal from being rotated as the bolt is fastened. Centralized power distribution member. The holder is provided with a terminal block on which the power feeding terminal can be placed and a nut that is screwed with the bolt is mounted to prevent the rotation, and the rotation preventing portion is formed on the terminal block. The concentrated power distribution member of the motor according to claim 1. The power supply terminal is formed in a crank shape in which a vertical plate rises at the front end of the substrate protruding in the radial direction from the bus bar, and a connection plate is bent at a right angle at the front end of the vertical plate. The connection plate is placed on the upper surface of the terminal block along the back surface of the terminal block,
The back surface portion of the terminal block is formed with an insertion groove into which both side edges of the vertical plate of the power supply terminal are inserted from above, thereby forming the anti-rotation portion. Item 5. A centralized power distribution member for a motor according to Item 2.

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