JP2013211126A - Terminal fitting and motor with terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal fitting capable of preventing spring-back of a folding piece even in a conductor wire with a low melting point while using a structure of a terminal fitting holding the conductor wire with a conventional folding piece and an opposite face, and a motor with the terminal fitting.SOLUTION: A terminal fitting 12 is made of a metal plate material, and holds a conductor wire with a folding piece 17 folded by cutting and raising a center section and an opposite plane 18 opposed to the folding piece 17. A first serration 170 and a second serration 180 to be electrically jointed to the conductor wire when holding the conductor wire are provided on the folding piece 17 and the opposite plane 18. A winding section 19 for winding the conductor wire around outer faces of the folding piece 17 and the terminal fitting 12 to keep a state where the conductor wire is held by the folding piece 17 and the opposite face 18 is provided on the terminal fitting 12.

Description

  The present invention relates to a terminal fitting and a motor equipped with the terminal fitting.

  2. Description of the Related Art Conventionally, there is known a terminal fitting to which a conducting wire having a core wire made of a stranded wire of aluminum or an aluminum alloy and a coating covering the outer periphery of the core wire is joined. As this type of terminal fitting, there is a terminal fitting provided with serrations to which conductive wires are joined (for example, see Patent Document 1). This terminal fitting has an F-crimp-shaped crimp structure so that the core wire bites into the serration by crimping the core wire, and electrical connection with the conductive wire is obtained, and the joint portion with the core wire does not spring back. .

  In addition, as a terminal fitting for electrically connecting a winding wound around a stator provided in a motor via an insulator and a circuit board attached to an end surface of the insulator, the terminal fitting is made of a metal plate material, and one of the metal plate materials. A terminal fitting is known in which a winding is sandwiched between a folded piece that is cut up and folded and a facing surface of a metal plate facing the folded piece. In this terminal fitting, an electrical connection is obtained by applying a predetermined voltage between the folded piece and the opposing surface to weld the winding and the terminal fitting, and the junction with the winding does not spring back. It is like that.

  By the way, a conductive wire provided with a core wire made of copper and a coating covering the outer periphery of the core wire is used for this winding. When aluminum or an aluminum alloy is used instead of copper as the core wire, aluminum or an aluminum alloy is used. Since the melting point is lower than that of copper, if the same voltage as that when copper is used as the core wire is applied between the folded piece and the facing surface, there is a possibility that the conducting wire may melt and break.

  In order to solve the problem that this conductor may melt and break, as a terminal fitting that electrically connects the winding and the circuit board, a terminal with serration instead of welding the winding and the terminal fitting Although it is conceivable to use metal fittings, the core wire of the lead wire used for the winding is a single wire, not a stranded wire, so use a crimped crimp structure with an F-crimp shape that bites into the gap of the stranded wire so that it does not spring back There was a problem that could not.

JP 2010-55936 A

  In view of the above problems, the present invention can prevent a springback of a folded piece even for a conductive wire having a low melting point, while utilizing the structure of a terminal fitting that sandwiches the conductive wire between a conventional folded piece and an opposing surface. It is an object of the present invention to provide a possible terminal fitting and a motor including the terminal fitting.

  In order to solve the above-mentioned problems, the terminal fitting of the present invention is made of a metal plate material, and sandwiches a conducting wire between a folded piece that is partially cut and folded and a facing surface that faces the folded piece. At least one of the folded piece or the opposing surface is provided with a serration for electrically joining the conductive wire when the conductive wire is sandwiched. The terminal fitting is provided with a winding portion for winding the conducting wire around the folded piece and the outer surface of the terminal fitting so as to maintain the state where the conducting wire is sandwiched between the folded piece and the facing surface.

  The terminal fitting is provided with a locking portion for locking the end portion of the conducting wire wound with the winding portion so as to maintain the state where the conducting wire is wound.

  Further, the motor of the present invention includes a stator in which a conducting wire is wound around a stator core via an insulator, a rotor arranged to face the stator in a rotatable state, a circuit board attached to the insulator with a gap, an insulator, A terminal fitting attached between the circuit board and electrically connecting the conductor and the circuit board is provided. The circuit board includes a terminal hole into which one end of the terminal fitting is inserted, and the insulator includes a terminal block into which the other end of the terminal fitting is inserted. The terminal fitting is made of a metal plate, and has a connection part inserted into the terminal hole at one end, an insertion part inserted into the terminal block at the other end, and a folded piece cut back and raised between the connection part and the insertion part. And a facing surface facing the folded piece. At least one of the folded piece or the opposed surface has a serration for electrically joining the drawn portion when the drawn portion of the conducting wire wound around the insulator is sandwiched between the folded piece and the opposed surface. Is provided with a winding part for winding the drawer part around the outer surface of the folded piece and the terminal fitting, and the drawer part is held so that the starting end side of the drawer part is sandwiched between the folded piece and the opposing surface. The terminal side of was wound around a winding part.

  According to the terminal metal fitting of the present invention and the motor equipped with the terminal metal fitting, the folded piece even if it is a conductive wire having a low melting point, utilizing the conventional structure of the terminal metal fitting that sandwiches the conductive wire between the folded piece and the opposing surface. Spring back can be prevented.

It is sectional drawing which shows the motor provided with the terminal metal fitting by this invention. It is a side view which shows the insulator with which the motor was equipped, the terminal metal fitting, and the circuit board. It is explanatory drawing which shows the terminal metal fitting by this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is explanatory drawing which shows the method to join a conducting wire to the terminal metal fitting by this invention, (a) is a side view which shows the state which arrange | positions a conducting wire between a folding piece and an opposing surface, (b) is a folding piece, an opposing surface, and It is a side view which shows the state which joins a terminal metal fitting and a conducting wire electrically by serration when pinched by. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the method to join a conducting wire to the terminal metal fitting by this invention, (a) is a side view which shows the state which contact | abuts the front end side of a folding piece to an opposing surface, (b) is a folding piece by a winding part. It is a side view which shows the state wound around the outer surface of the terminal metal fitting. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows a mode that a conducting wire is joined to the terminal metal fitting by this invention, (a) is a front view which shows the state which pinched | interposed the conducting wire by the return piece and the opposing surface, (b) is a return wire and a terminal metal fitting. It is a front view which shows the state wound around the outer surface.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As a terminal fitting according to the present invention, a terminal fitting provided in a motor will be described as an example. In addition, you may apply the terminal metal fitting by this invention to electrical components, such as rotary electric machines, such as generators other than a motor, and a coil. Moreover, although the radial gap type motor which has an inner rotor structure is demonstrated as a motor provided with the terminal metal fitting by this embodiment, you may apply to an axial gap type motor.

  As shown in FIG. 1, the motor M provided with the terminal fitting according to the present embodiment is attached to the cylindrical stator 1, the rotor 2 disposed on the inner diameter side of the stator 1, and one end side of the stator 1 with a gap. A circuit board 4, a stator 1, a rotor 2, and a bracket 5 covering the circuit board 4 and the like are provided.

  The stator 1 includes a stator core 1A, an insulator 7 formed of synthetic resin around the stator core 1A, and a conductive wire 6 wound around the insulator 7. A base support portion 8 that supports the circuit board 4 is formed on a base portion 7A (see FIG. 2) of the insulator 7 that faces the circuit board 4. The conducting wire 6 is composed of a core wire made of a single wire of aluminum or aluminum alloy and a coating covering the outer periphery of the core wire.

  The rotor 2 has a rotation shaft 2B at the center and a rotor core 2A on the outer periphery of the rotation shaft 2B. A permanent magnet is attached to the outer periphery of the rotor core 2A. The rotor 2 rotates when the permanent magnet receives the magnetic force of the rotating magnetic field generated by energizing the conducting wire 6. The rotor 2 may be one in which a permanent magnet is embedded inside the rotor core 2A.

  In the circuit board 4, the electronic component 3 that generates heat when energized is mounted on the surface opposite to the surface facing the insulator 7. The electronic component 3 controls the current flowing through the conducting wire 6 provided in the stator 1. Between the electronic component 3 and the bracket 5, a heat radiating sheet 9, an aluminum block 10, and silicon 11 are arranged in this order. The heat generated in the electronic component 3 by energization is transferred to the outside from the bracket 5 through the heat radiating sheet 9, the aluminum block 10, and the silicon 11.

  As shown in FIG. 2, the motor M includes a terminal fitting 12 that is attached between the insulator 7 and the circuit board 4 and to which a conducting wire 6 (not shown) is joined. A terminal block 13 into which the terminal fitting 12 is inserted is formed on the base portion 7 </ b> A facing the circuit board 4 of the insulator 7. The circuit board 4 is formed with a board support part hole 20 into which the tip of the board support part 8 is inserted and a terminal hole 21 into which the terminal fitting 12 is inserted.

  The circuit board 4 is supported by the insulator 7 by inserting the tip of the board support part 8 into the board support part hole 20. The circuit board 4 is electrically connected to the conductor 6 through the terminal fitting 12 by inserting one end of the terminal fitting 12 into the terminal hole 21 and soldering to the wiring pattern on the circuit board 4. The terminal fitting 12 is held by the insulator 7 by inserting the other end of the terminal fitting 12 into the terminal block 13.

  Next, the terminal metal fitting 12, which is a feature of the present invention, will be described with reference to FIGS. As shown in FIGS. 3A to 3C, the terminal fitting 12 is made of, for example, a metal plate material obtained by applying tin plating to a brass plate material. The terminal fitting 12 holds the insertion portion 15 in the terminal block 13 near one end of the connection portion 14 inserted into the terminal hole 13 at one end, the insertion portion 15 inserted into the terminal block 13 at the other end, and the other end. A pair of projecting pieces 16, a folded piece 17 that is cut and raised between the connecting portion 14 and the insertion portion 15 (center portion of the terminal fitting 12), and a facing surface 18 that faces the folded piece 17. I have. The terminal fitting 12 holds the lead-out portion of the conducting wire 6 wound around the insulator 7 shown in FIG. 1 between the folded piece 17 and the facing surface 18.

  When the lead-out portion of the conducting wire 6 is sandwiched between the folded piece 17 and the opposing surface 18, a first serration 170 for electrically joining the lead-out portion of the conducting wire 6 and a second serration 180 facing the first serration 170, Is provided. A plurality of first serrations 170 and second serrations 180 are provided on the base side of the folded piece 17 and the opposing surface 18, respectively, and are alternately arranged so as not to face each other across the lead-out portion of the conducting wire 6.

  The first serration 170 and the second serration 180 are formed by punching from the direction of arrow A shown in FIG. 3 (c) using a jig (not shown), and alternately forming convex portions and concave portions therebetween. is there. The first serration 170 and the second serration 180 are formed to extend in a direction intersecting the length direction of the conductor 6 when the lead portion of the conductor 6 is sandwiched. Note that the folded piece 17 and the facing surface 18 in which only the first serration 170 or the second serration 180 is provided may be used.

  As a specific configuration, as shown in FIG. 6A, the terminal fitting 12 holds a state in which the starting end side 6 </ b> AA of the lead-out portion 6 </ b> A of the conducting wire 6 is sandwiched between the folded piece 17 and the facing surface 18. In addition, a winding part 19 for winding the terminal side 6AB of the lead part 6A of the lead wire 6 around the outer surface 172 of the folded piece 17 and the outer surface 120 of the terminal fitting 12 is provided. The winding part 19 is provided with a plurality of notches 191 for guiding the terminal side 6AB of the lead part 6A of the lead wire 6. Each notch 191 is formed by notching both side ends of the terminal fitting 12 near the opposing surface 18 inward.

  Further, as shown in FIGS. 3 (b) and 6 (b), the terminal fitting 12 is provided with the winding portion 19 so as to keep the state where the terminal side 6AB of the lead portion 6 </ b> A of the conducting wire 6 is wound. A locking portion 20 is provided for locking the terminal portion 6AC of the lead-out portion 6A of the lead wire 6 guided and wound by the notch portion 191 provided. The locking part 20 is formed so as to protrude below and below the notch part 191 formed at the right end of the terminal fitting 12. In addition, you may change the position which forms the latching | locking part 20 suitably.

  A joining method for joining the lead wire 6 to the terminal fitting 12 having the structure described above will be described with reference to FIGS. First, as illustrated in FIG. 4A, the lead portion 6 </ b> A of the conducting wire 6 is disposed between the folded piece 17 and the facing surface 18, that is, between the first serration 170 and the second serration 180. At this time, it arrange | positions so that the length direction of the conducting wire 6 may turn into the direction which cross | intersects the 1st serration 170 and the 2nd serration 180. FIG.

  Next, as illustrated in FIG. 4B, the lead portion 6 </ b> A of the conducting wire 6 is sandwiched between the folded piece 17 and the facing surface 18, and the terminal fitting 12 and the conducting wire 6 are electrically joined. At this time, the base side of the folded piece 17 is caulked so that the front end side of the folded piece 17 abuts against the opposing surface 18. As a result, the first serration 170 and the second serration 180 break the coating of the conductive wire 6 and are electrically joined to the core wire of the conductive wire 6.

  Next, as shown in FIG. 5 (a), after crimping the tip end side of the folded piece 17 so that the tip 171 of the folded piece 17 is in contact with the opposing surface 18, FIG. As shown in FIG. 6, the end side 6AB of the lead-out portion 6A of the conducting wire 6 sandwiching the start end side 6AA between the folded piece 17 and the facing surface 18 is wound using the winding portion 19. At this time, the lowermost notch on the right end of the terminal fitting 12 is wound around the outer end 172 of the leading end side of the folded piece 17 and the outer surface 120 of the terminal fitting 12 so that the terminal end 6AB of the lead portion 6A of the conducting wire 6 is wound. The end side 6AB of the lead part 6A of the lead wire 6 is hooked on the part 191, and the end side 6AB of the lead part 6A of the hooked lead wire 6 is passed to the notch part 191 in the central part at the left end of the terminal fitting 12. Thereafter, the terminal end 6AB of the lead-out portion 6A of the delivered conductor 6 is connected to the central notch 191 at the right end of the terminal fitting 12, the uppermost notch 191 at the left end, and the uppermost notch 191 at the right end. It winds by guiding in the order of the notch part 191. As a result, the leading end side 6AA of the lead portion 6A of the conducting wire 6 is held in a state of being sandwiched between the folded piece 17 and the facing surface 18, and is held in a state in which the tip portion 171 of the folded piece 17 is in contact with the facing surface 18. Is done.

  Finally, as shown in FIG. 6 (b), the terminal end side 6 AB of the lead-out portion 6 A of the lead wire 6 that is finally guided to the notch 191 at the right end of the terminal fitting 12 is moved in the direction of the locking portion 20. By pulling and bending the locking portion 20, the terminal portion 6AC of the lead-out portion 6A is clamped. Instead of bending the caulking portion 20 and caulking, a cut portion may be provided in a part of the lock portion 20 and the terminal portion 6AC of the lead portion 6A of the lead wire 6 may be sandwiched between the cut portions. As shown in FIG. 6, the conductor 6 is joined to the terminal fitting 12 by the joining method described above.

  Although not shown in the drawing, since the motor M is assembled thereafter, the insertion portion 15 of the terminal fitting 12 is inserted into the terminal block 13 of the insulator 7 and the connection portion 14 of the terminal fitting 12 is the terminal of the circuit board 4. It is inserted into the hole 21 and soldered to the wiring pattern on the circuit board 4.

  According to the terminal fitting 12 of the present invention and the motor M provided with the terminal fitting 12 described above, when the conducting wire 6 is sandwiched between the folded piece 17 and the opposing surface 18 provided in the terminal fitting 12, the conducting wire 6. A first serration 170 and a second serration 180 are provided for electrical connection with each other. The terminal metal 12 is wound to wind the conductive wire 6 around the folded pieces 17 and the outer surfaces 172 and 120 of the terminal metal 12 so that the state in which the conductive wire 6 is sandwiched between the folded pieces 17 and the facing surface 18 is maintained. A part 19 is provided.

  In the present invention, the lead wire 6 is sandwiched between the first serration 170 and the second serration 180 to break the coating of the lead wire 6, and is electrically joined to the core wire of the lead wire 6. The leading end side of the folded piece 17 is held in contact with the opposing surface 18 by the conductive wire 6 wound around the side and the outer surfaces 172 and 120 of the terminal fitting 12. This eliminates the need for applying a predetermined voltage between the folded piece and the facing surface to weld the lead wire and the terminal fitting, unlike the conventional terminal fitting. Therefore, even if the conducting wire 6 joined to the terminal fitting 12 is provided with a core wire such as aluminum having a melting point lower than that of copper, the possibility that the conducting wire 6 is melted and disconnected can be prevented. Further, the terminal fitting 12 is wound around the front end side of the folded piece 17 and the outer surfaces 172 and 120 of the terminal fitting 12 using the winding portion 19 without using the F-crimp-shaped crimping structure as in Patent Document 1. By holding the tip end side of the folded piece 17 in contact with the opposing surface 18 with the conducting wire 6, it is possible to prevent the spring back of the joint portion with the conducting wire 6.

  Further, the terminal fitting 12 of the present invention has a locking portion for locking the terminal portion 6AC of the lead-out portion 6A of the lead wire 6 around which the winding portion 19 is wound so as to maintain the state where the lead wire 6 is wound. 20 is provided. As a result, when the terminal portion 6AC of the lead portion 6A of the lead wire 6 is locked to the locking portion 20, the lead wire 6 drawn around the tip end side of the folded piece 17 and the outer surfaces 172 and 120 of the terminal fitting 12 is drawn. The part 6A can be prevented from loosening.

  Further, in the terminal fitting 12 of the present invention, the first serrations 170 of the folded pieces 17 and the second serrations 180 of the facing surface 18 are alternately arranged so as not to face each other across the lead portion 6A of the lead wire 6. Yes. As a result, by the first serration 170 and the second serration 180, the contact area between the terminal fitting 12 and the conductive wire 6 can be increased, and the electrical bondability of the conductive wire 6 can be improved. Moreover, since the 1st serration 170 and the 2nd serration 180 are not concentrated and pinched by one place of the conducting wire 6, the possibility that the conducting wire 6 may be disconnected can be reduced.

  In addition, in the terminal metal fitting 12 by this embodiment, it was made to provide the folding | turning piece 17 which raised and turned between the connection part 14 and the insertion part 15 (center part of the terminal metal fitting 12), but this invention is added to this. Not limited to this, a part of the terminal fitting 12, for example, a folded piece obtained by cutting and folding the other end of the metal plate with the insertion portion 15 may be provided. In this case, the position of the facing surface facing the folded piece and the winding part also changes. Further, in the terminal fitting 12 according to the present embodiment, the first serrations 170 and the second serrations 180 are arranged in a staggered manner so as not to face each other with the lead-out portion 6A of the conducting wire 6 interposed therebetween. Not limited to this, the first serration 170 and the second serration 180 may be arranged so as to face each other with the lead-out portion 6A of the conducting wire 6 interposed therebetween.

M Motor 1 Stator 1A Stator core 2 Rotor 2A Rotor core 2B Rotating shaft 3 Electronic component 4 Circuit board 5 Bracket 6 Conductor 6A Lead-out part 6AA Start side 6AB Termination side 6AC Termination part 7 Insulator 7A Base part 8 Heat radiation sheet 10 Block 9 Silicon 12 Terminal fitting 120 Outer surface 13 Terminal block 14 Connection portion 15 Insertion portion 16 Projection piece 17 Folding piece 170 First serration 171 Tip portion 172 Outer surface 18 Opposing surface 180 Second serration 19 Winding portion 191 Notch portion 20 Locking portion 21 Substrate Support hole 22 Terminal hole

Claims (3)

It is a terminal fitting made of a metal plate material, sandwiching a conducting wire between a folded piece that is partly raised and folded, and a facing surface that faces the folded piece,
At least one of the folded piece or the opposing surface is provided with a serration for electrically joining the conductive wire when the conductive wire is sandwiched,
The terminal fitting is provided with a winding portion for winding the conducting wire around the folded piece and the outer surface of the terminal fitting so as to hold the state where the conducting wire is sandwiched between the folded piece and the facing surface. Terminal fittings characterized by being.   The terminal fitting is provided with a locking portion for locking an end portion of the conducting wire wound with the winding portion so as to maintain a state where the conducting wire is wound. The terminal fitting according to claim 1. A stator in which a conducting wire is wound around a stator core via an insulator, a rotor disposed to face the stator in a rotatable state, a circuit board attached to the insulator with a gap, and the insulator and the circuit board A motor provided with a terminal fitting attached between and electrically connecting the conductor and the circuit board,
The circuit board includes a terminal hole into which one end of the terminal fitting is inserted,
The insulator includes a terminal block into which the other end of the terminal fitting is inserted,
The terminal fitting is made of a metal plate, and has a connection portion inserted into the terminal hole at one end, an insertion portion inserted into the terminal block at the other end, and a gap between the connection portion and the insertion portion. A folded piece that is folded, and a facing surface that faces the folded piece,
At least one of the folded piece or the opposed surface is for electrically connecting the drawn portion of the conducting wire wound around the insulator between the folded piece and the opposed surface when the folded portion is sandwiched between the folded piece and the opposed surface. Having serrations,
The terminal fitting is provided with a winding portion for winding the lead-out portion around the folded piece and the outer surface of the terminal fitting,
A motor characterized in that the terminal end side of the lead-out part is wound around the winding part so as to keep the state where the start-end side of the lead-out part is sandwiched between the folded piece and the facing surface.

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