JP2014233181A - Member for power distribution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for power distribution, which can facilitate assembling work while suppressing a decrease in rigidity.SOLUTION: A member for power distribution is formed by assembling a plurality of bus rings, and the bus ring has a conductive member and a resin member. The conductive member has a ring part and a plurality of terminals protruding from the ring part. The resin member covers the ring part of the conductive member. The resin member has a mating surface, the entire perimeter or part of which is brought into surface contact on the surface side facing another resin member. The plurality of bus rings are stacked by making the mating surfaces abut on each other.

Description

  The present invention relates to a power distribution member for supplying power to a motor.

  In recent years, vehicles equipped with a motor as a drive source have been developed. A very large three-phase current flows through the motor through the power distribution member. The power distribution member is configured to insulate a path through which a three-phase current flows.

  Patent Document 1 discloses a vehicle motor power distribution member including three conductive annular members and a belt-like member that holds the three annular members in a separated state. In the method of assembling each motor concentrated power distribution member, three annular members are arranged concentrically, and the three annular members are bound and temporarily held by a binding member in a state of being spaced apart by a predetermined distance along the axial direction. The concentrated power distribution member for a motor is assembled by pushing the temporarily held annular member into each housing groove of the belt-like member.

JP 2005-160137 A

  The technique described in Patent Document 1 is an assembly process in which each annular member is temporarily held by a bundling member and then pushed into the receiving groove of the belt-like member, so that the assembly work is troublesome. Further, since the outer frame of the motor concentrated power distribution member is formed of a bendable rubber band member, the rigidity of the motor concentrated power distribution member may be too low.

  This invention is made | formed in view of such a subject, The objective is to provide the member for electrical distribution which can make assembly work easy, suppressing the fall of rigidity.

  In order to solve the above problems, a power distribution member according to an aspect of the present invention is a power distribution member formed by assembling a plurality of bus rings, and the bus ring includes a plurality of ring portions and a plurality of ring portions protruding from the ring portions. A conductive member having a terminal; and a resin member covering the ring portion. The resin member has a mating surface that is in surface contact with the entire circumference or a part of the surface facing the other resin member. The plurality of bus rings are stacked with the mating surfaces in contact with each other.

  According to this aspect, rigidity can be secured in advance by covering the ring portion of each bus ring with the resin member. Moreover, the assembly work can be facilitated by bringing the mating surfaces of the resin members into contact with each other and stacking the respective bus rings.

  ADVANTAGE OF THE INVENTION According to this invention, an assembly operation can be made easy, suppressing the fall of the rigidity of the member for power distribution.

It is a perspective view of the member for electric power distribution concerning an embodiment. It is a perspective view of each electroconductive member. It is sectional drawing of line segment AA of the member for electrical distribution shown in FIG. It is a figure for demonstrating the assembly of the member for power distribution. It is a figure for demonstrating the convex part and recessed part which were formed in each bus ring.

  FIG. 1 is a perspective view of a power distribution member 10 according to the embodiment. The power distribution member 10 is provided, for example, in a hybrid vehicle, and supplies the regenerated power to the motor. The power distribution member 10 receives three-phase AC currents from an external drive circuit, and supplies the AC currents of the respective phases to the motor coil. Although the motor and the power distribution member 10 are formed thin due to restrictions on the space in the engine room, the current for driving the vehicle is very large, and it is necessary to appropriately insulate the power supply path of each phase. In the power distribution member 10 of the embodiment, the power supply path of each phase is insulated by covering the conductive member with a resin member. The terminals projecting outward in the radial direction are arranged at equal intervals in the circumferential direction. For example, the motor coil has a plurality of coils provided at equal intervals in the circumferential direction and projecting radially inward. In-out terminals of the power distribution member are connected to the coil.

  The power distribution member 10 includes a first bus ring 12, a second bus ring 14, and a third bus ring 16, and is formed by assembling three bus rings. That is, each bus ring is formed separately, and the power distribution member 10 is formed by assembling them so as to be laminated. The configuration of the bus ring will be described in detail with reference to another drawing.

  FIG. 2 is a perspective view of each conductive member. In this state, the resin member is removed from the power distribution member 10. It should be noted that the same or equivalent components and members shown in the drawings are denoted by the same reference numerals, and redundant description will be omitted as appropriate.

  The first conductive member 22 includes a first ring portion 46, a first terminal 34, and a first connection portion 22a. Similarly, the second conductive member 24 includes a second ring portion 48, a second terminal 36, and a second connection portion 24a, and the third conductive member 26 includes a third ring portion 50, a third terminal 38, and It has the 3rd connection part 26a. The first ring portion 46, the second ring portion 48, and the third ring portion 50 are formed in an annular shape.

  The first conductive member 22 has a plurality of first terminals 34 projecting radially outward from the first ring portion 46, and the second conductive member 24 is radially outward from the second ring portion 48. The third conductive member 26 has a plurality of third terminals 38 that project radially outward from the third ring portion 50. The first terminal 34, the second terminal 36, and the third terminal 38 are connected to a motor coil for supplying power to the motor. The first connection portion 22a, the second connection portion 24a, and the third connection portion 26a projecting radially outward from the ring portion are connected to an external drive circuit, and currents of respective phases are supplied from the drive circuit.

  The first conductive member 22, the second conductive member 24, and the third conductive member 26 have the same shape and size, and the manufacturing cost can be reduced as compared with the case where conductive members having different shapes are formed. .

  3 is a cross-sectional view taken along line AA of the power distribution member 10 shown in FIG. As shown in FIG. 3, the first bus ring 12, the second bus ring 14, and the third bus ring 16 are stacked.

  The first bus ring 12 includes a first conductive member 22 and a first resin member 28 that covers the first ring portion 46 of the first conductive member 22. Similarly, the second bus ring 14 includes a second conductive member 24 and a second resin member 30 that covers the second ring portion 48 of the second conductive member 24, and the third bus ring 16 includes The third conductive member 26 and the third resin member 32 that covers the third ring portion 50 of the third conductive member 26 are provided.

  The cross sections of the first bus ring 12, the second bus ring 14, and the third bus ring 16 are formed in a rectangular shape. The first resin member 28 of the first bus ring 12 covers at least the entire circumference of the first ring portion 46 in the first conductive member 22. Thereby, the 1st electroconductive member 22 can be coat | covered with the 1st resin member 28, and the process of apply | coating to the 1st electroconductive member 22 with an insulating material can be omitted. The first resin member 28 is formed by insert molding. By covering the first conductive member 22 with the first resin member 28 to form the first bus ring 12, the rigidity of the first bus ring 12 can be secured in advance. Similarly, the second bus ring 14 and the third bus ring 16 can be covered and insulated with the second resin member 30 and the third resin member 32, and rigidity can be secured in advance.

  As shown in FIG. 3, the first bus ring 12, the second bus ring 14, and the third bus ring 16 are assembled by being laminated in the axial direction. The axial direction is a direction along the central axis of the first bus ring 12. The central axis of each bus ring is coaxial. By forming each bus ring separately and assembling them to form the power distribution member 10, each bus ring can be inspected to ensure insulation of the conductive member.

As shown in FIG. 3, the second sectional moment of the first resin member 28 of the first bus ring 12 is larger than the second sectional moments of the other second resin member 30 and the third resin member 32. In addition, although the electroconductive member is contained in the cross section of each resin member, since it is the same size, it can be disregarded. As shown in FIG. 3, the width h of the first resin member 28 is larger than the width g of the second resin member 30 and the third resin member 32. The sectional second moment of the first resin member 28 is proportional to the cube of the width h, and the sectional moments of the second resin member 30 and the third resin member 32 are proportional to the cube of the width g. In addition, the height a of each resin member is the same. If the cross-sectional second moment is large, it is difficult to deform and the rigidity is high. Accordingly, the rigidity of the first bus ring 12 is made higher than that of the other bus rings, and the second bus ring 14 and the third bus ring 16 are assembled to the first bus ring 12 to ensure the rigidity of the entire power distribution member 10. be able to. Further, by forming the second resin member 30 and the third resin member 32 to be relatively small, it is possible to suppress the amount of resin used as the entire power distribution member 10 and to reduce the weight of the power distribution member 10. . The cross-sectional shape of the first resin member 28 is not limited to the rectangular shape shown in FIG. 3, and any cross-sectional second moment may be used as long as it is larger than the second resin member 30 and the third resin member 32.
First moment of cross section of first resin member 28 = ah3 / 12
Second moment of section of second resin member 30 = ag3 / 12

  The first resin member 28 of the first bus ring 12 positioned on one end side in the axial direction is formed with a different cross section from the other resin members, while the other second resin member 30 and the third resin member 32. Are the same shape. The first resin member 28 of the first bus ring 12 is larger than the second resin member 30 and the third resin member 32, and the amount of resin used is large, while the resin amount of the two resin members can be reduced. That is, the second bus ring 14 and the third bus ring 16 have the same shape and size, and the manufacturing cost can be reduced as compared with the case where the shapes of the second bus ring 14 and the third bus ring 16 are different from each other. . In particular, since the second bus ring 14 and the third bus ring 16 can be molded in the same mold in insert molding, the manufacturing cost can be further suppressed.

  In the first resin member 28 of the first bus ring 12, a plurality of grooves 44 are formed on the outer circumferential surface in the radial direction. The groove 44 is formed to extend in the axial direction, and both axial ends thereof are open to the outside. That is, the groove 44 reaches from the front surface to the back surface of the first resin member 28 and communicates the front and back of the first resin member 28. The groove 44 is formed so as to be cut inward in the radial direction from the outer peripheral surface of the first resin member 28. Since the outer peripheral surface of the first resin member 28 has a larger area than the inner peripheral surface, it tends to expand and contract. When the power distribution member 10 expands due to a high temperature, the expansion is absorbed by closing the groove 44, and when the power distribution member 10 contracts due to a low temperature, the groove 44 is expanded to absorb the contraction. Thereby, durability of the member 10 for power distribution can be improved. Moreover, the durability of the power distribution member 10 can be efficiently increased by forming the groove portion 44 in the first resin member 28 that is larger than the other resin members.

  As shown in FIG. 3, the power distribution member 10 is assembled by bringing the axial surfaces of the resin members into contact with each other. The first resin member 28 has a first mating surface 60, the second resin member 30 has a second mating surface 62, and the third resin member 32 has a third mating surface 64. The mating surface is an upper surface or / and a lower surface on the axial direction side of each resin member.

  The power distribution member 10 is assembled so that the mating surfaces of the bus rings are brought into contact with each other and stacked in the axial direction. These mating surfaces are in surface contact with the entire circumference or a part of the surface facing the other resin member. For example, the first mating surface 60 of the first bus ring 12 and the second mating surface 62 of the second bus ring 14 are opposed to each other in the axial direction and are in surface contact with the entire circumference. The second mating surface 62 and the third mating surface 64 of the third bus ring 16 are in axial contact with each other so as to face each other in the axial direction. The power distribution member 10 can be easily assembled by bringing these mating surfaces into contact with each other. The mating surfaces may be in surface contact so as to be partially interrupted in the circumferential direction.

  A concave portion 70 is formed on the first mating surface 60 of the first bus ring 12, a convex portion 72 is formed on the second mating surface 62 on the upper side of the second bus ring 14, and a concave portion 74 is formed on the lower second mating surface 62. , A convex portion 76 is formed on the upper third mating surface 64 of the third bus ring 16, and a concave portion 78 is formed on the lower third mating surface 64. The concave portion and the convex portion formed on these mating surfaces are fitted to each other. The bus rings can be easily stacked in the assembly process by the concave portions and the convex portions.

  FIG. 4 is a view for explaining assembly of the power distribution member 10. 4 (a) is a partial perspective view of the second bus ring 14 and the third bus ring 16 during assembly, and FIG. 4 (b) is a partial perspective view of the power distribution member 10 that has been assembled. FIG.4 (c) is sectional drawing of line segment BB of the member 10 for electrical distribution shown in FIG.4 (b).

  FIG. 4A shows a state in which the mating surfaces of the second bus ring 14 and the third bus ring 16 are in contact with each other. A plurality of engagement recesses 52 a and 52 b are formed on the inner peripheral surface of the second bus ring 14, and a plurality of engagement recesses 54 a and 54 b are formed on the inner peripheral surface of the third bus ring 16. Each engaging recess is formed by denting the inner peripheral surfaces of the second bus ring 14 and the third bus ring 16 and has the same shape.

  The second bus ring 14 and the third bus ring 16 have the same shape, and the engaging recess 52a and the engaging recess 54a are formed at the same position. As shown in FIG. 4A, the circumferential positions of the second terminal 36 and the third terminal 38 are shifted and stacked, so that the axial positions of the engaging recess 52a and the engaging recess 54b are aligned. That is, the engagement recess 52b and the engagement recess 54a are formed extra for the same shape. The first bus ring 12 is assembled to the second bus ring 14 and the third bus ring 16 shown in FIG. The engaging recess 52a and the engaging recess 54b also function as circumferential alignment of the second bus ring 14 and the third bus ring 16.

  As shown in FIGS. 4B and 4C, the engagement formed in the first resin member 28 of the first bus ring 12 with respect to the engagement recess 52a and the engagement recess 54b aligned in the axial direction. The nail | claw body 42 engages. The first resin member 28 is formed with an engaging claw body 42 formed so as to hang in the axial direction from the inner peripheral surface. Eight engaging claws 42 are formed at equal intervals in the circumferential direction. The engaging claw body 42 has flexibility.

  The circumferential width of the engagement claw body 42 and the circumferential width of the engagement recess 52a and the engagement recess 54b are substantially the same, and the engagement claw body 42 fits into the engagement recess 52a and the engagement recess 54b. As shown in FIG. 4C, the claw portion 42 a that is formed at the tip of the engaging claw body 42 and protrudes radially outwardly is hooked on the lower end of the third bus ring 16. In other words, in the plurality of bus rings, the engaging claw body 42 formed on the first bus ring 12 (first resin member 28) located on one end side in the axial direction has a third position located on the other end side in the axial direction. Engages with the bus ring 16 (third resin member 32). Thereby, the engaging claw body 42 holds the second bus ring 14 and the third bus ring 16 by sandwiching the second bus ring 14 between the first bus ring 12 and the third bus ring 16. The engaging claws 42 can facilitate the assembly of the power distribution member 10.

  FIG. 5 is a diagram for explaining a convex portion and a concave portion formed in each bus ring. In FIG. 5, the bus rings are arranged apart from each other in the axial direction so that the shape of the mating surface can be seen.

  As shown in FIG. 5A, a convex portion 72 is formed on the second mating surface 62 on the upper side of the second bus ring 14 so as to extend in the circumferential direction. On the mating surface 64, a convex portion 76 is formed so as to extend in the circumferential direction.

  As shown in FIG. 5B, a recess 70 is formed on the first mating surface 60 on the lower side of the first bus ring 12 so as to extend in the circumferential direction. A concave portion 74 is formed on the second mating surface 62 so as to extend in the circumferential direction, and a concave portion 78 is formed on the third mating surface 64 below the third bus ring 16 so as to extend in the circumferential direction. Is done. By fitting these concave and convex portions, it is possible to suppress radial displacement between the bus rings.

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added to the embodiments based on the knowledge of those skilled in the art, and such modifications have been added. Embodiments may also be included within the scope of the present invention.

  Although an embodiment using a three-phase alternating current has been described in the embodiment, other than the three-phase alternating current may be used. For example, two phases may be sufficient and four phases may be sufficient. The number of bus bars is changed accordingly.

  In the embodiment, the conductive member has a plurality of terminals 34, 36, and 38 that protrude outward in the radial direction from the ring portion, but is not limited thereto. For example, each conductive member may have a plurality of terminals projecting radially inward from the ring portion. In this aspect, a plurality of motor coils are provided at equal intervals in the circumferential direction and have a protruding portion that protrudes radially outward, and the protruding portion of the coil and the plurality of terminals of the conductive member are electrically connected. The

  In the embodiment, a mode in which each of the three bus rings is assembled by the plurality of engaging claws 42 is shown, but the present invention is not limited to this mode. For example, each bus ring may be integrated by welding, or may be integrated using an adhesive.

  In the embodiment, the mode in which the groove portion 44 is formed only in the first resin member 28 of the first bus ring 12 is shown, but the present invention is not limited to this mode, and the groove portion may be formed on the radially outer side of another resin member.

  In the embodiment, the aspect in which the mating surfaces are formed on the upper and lower surfaces in the axial direction of each resin member is shown, but the present invention is not limited to this aspect. For example, the mating surface is formed to be inclined with respect to the axial direction. By inclining the mating surface with respect to the axial direction, the second bus ring 14 and the third bus ring 16 can be made difficult to be displaced in the radial direction before being fixed by the engaging claw body 42.

  DESCRIPTION OF SYMBOLS 10 Power distribution member, 12 1st bus ring, 14 2nd bus ring, 16 3rd bus ring, 22 1st electroconductive member, 22a 1st connection part, 24 2nd electroconductive member, 24a 2nd connection part, 26 3rd conductive member, 26a 3rd connection part, 28 1st resin member, 30 2nd resin member, 32 3rd resin member, 34 1st terminal, 36 2nd terminal, 38 3rd terminal, 40 mounting hole, 42 Engaging claw body, 42a claw portion, 44 groove portion, 46 first ring portion, 48 second ring portion, 50 third ring portion, 52, 54 engaging recess, 60 first mating surface, 62 second mating surface, 64 Third mating surface.

Claims (6)

A power distribution member formed by assembling a plurality of bus rings,
The bus ring is
A conductive member having a ring portion and a plurality of terminals protruding from the ring portion;
A resin member covering the ring portion,
The resin member has a mating surface that is in surface contact with the entire circumference or part of the surface facing the other resin member,
The plurality of bus rings are stacked with the mating surfaces in contact with each other, and the power distribution member.   The cross-sectional second moment of the resin member of one of the bus rings is larger than the second-order moment of the resin member of the other bus ring. Power distribution member.   While the cross-sectional secondary moment of the first resin member of the first bus ring located on one end side in the axial direction among the plurality of bus rings is larger than the cross-sectional secondary moments of the other resin members, The power distribution member according to claim 1, wherein the resin member has the same shape.   The power distribution member according to claim 3, wherein the first resin member has an engaging claw that engages with the resin member located on the other end side in the axial direction.   The power distribution member according to claim 1, wherein the resin member has a concave portion or a convex portion that are fitted to each other on the mating surface.   The said 1st resin member is formed so that it may extend in an axial direction in the surrounding surface of a radial direction outer side, The axial direction both ends have the groove part open | released outside, For the electrical distribution of Claim 3 characterized by the above-mentioned. Element.

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