JP4745869B2 - Short-circuit member, commutator, DC motor, and method for manufacturing short-circuit member - Google Patents

Description

  The present invention relates to a short-circuit member for short-circuiting predetermined segments.

2. Description of the Related Art Conventionally, as described in Patent Document 1, a commutator of a direct current motor includes a flat short-circuit member that short-circuits segments having the same potential among a plurality of segments included in the commutator. There is. The short-circuit member described in Patent Literature 1 includes an outer peripheral side terminal arranged in the same number as the segment in the circumferential direction, an inner peripheral side terminal arranged in the same number as the outer peripheral side terminal in the circumferential direction inside the outer peripheral side terminal, and an outer circumference The same number of side terminals are provided, and the connection part which connects an outer peripheral side terminal and an inner peripheral side terminal by respectively shifting by a predetermined angle in the circumferential direction is comprised from two short circuit component groups formed in the same plane. These two short circuit component groups are laminated so that the connecting portions are in opposite directions. Moreover, while the outer peripheral side terminals electrically connected to a segment and the inner peripheral side terminals are in contact with each other in the stacking direction, the connecting portions are not in contact with each other in the stacking direction. Furthermore, an insulating material formed by filling an insulating resin material is interposed between connecting portions adjacent in the circumferential direction and between connecting portions facing each other in the stacking direction.
JP 2005-137193 A

  However, when the short-circuit member described in Patent Document 1 is manufactured, the insulating material is formed by filling the molten insulating resin material after laminating the two short-circuit constituent member groups. There is a problem that the connecting portions are deformed in the circumferential direction by the pressure, and adjacent connecting portions are short-circuited. In addition, in the short-circuit member configured such that the insulating resin material is not filled between the connection portions adjacent to each other in the circumferential direction, when the short-circuit member is assembled as a part of the DC motor, some external force acts and the connection portion is When deformed in the circumferential direction, there is a possibility that the connecting portions adjacent in the circumferential direction are short-circuited.

  The present invention has been made in view of such circumstances, and the purpose thereof is a short-circuit member capable of suppressing a short-circuit between connecting portions adjacent to each other in the circumferential direction, a commutator including the short-circuit member, It is providing the direct current motor provided with this short circuit member, and the manufacturing method of this short circuit member.

  In order to solve the above-mentioned problem, the invention according to claim 1 includes a plurality of outer peripheral terminals arranged in the circumferential direction, and an inner peripheral side arranged in the same number as the outer peripheral terminals in the circumferential direction inside the outer peripheral terminal. A short-circuit member provided with a short-circuit component member group having a terminal and a connecting portion that is provided in the same number as the outer peripheral terminal and connects the outer peripheral terminal and the inner peripheral terminal with a predetermined angle shift in the circumferential direction. Thus, the gist of the connecting portions adjacent to each other in at least one pair of circumferential directions is that the end surfaces in the width direction adjacent to each other in the circumferential direction are separated in the axial direction of the short-circuit member. .

  According to this configuration, in at least one pair of connecting portions, the end faces in the width direction adjacent to each other in the circumferential direction of the connecting portions are separated in the axial direction of the short-circuit member. Therefore, the connecting portions forming a pair have a circumferential gap between the connecting portions as compared to the case where the end surfaces in the width direction adjacent to each other in the circumferential direction are not separated in the axial direction. Becomes wider. As a result, when forming the short-circuit member and assembling the short-circuit member, even when circumferential pressure is applied to the connecting portion and the connecting portion is deformed, the circumferential clearance between the connecting portions is wide. For this reason, it is possible to suppress short-circuiting between the connecting portions adjacent in the circumferential direction.

  In the present invention, the “axial direction of the short-circuit member” is a direction perpendicular to the arrangement direction of the plurality of outer peripheral side terminals, and all the outer circumferences arranged in the circumferential direction when the short-circuit member is viewed from the direction. This is the direction in which the side terminal can be seen. Further, the “pair of connecting portions” may be any two connecting portions adjacent in the circumferential direction.

  The invention according to claim 2 is a plurality of outer peripheral terminals arranged in the circumferential direction, inner peripheral terminals arranged in the same number as the outer peripheral terminals in the circumferential direction inside the outer peripheral terminals, and the outer peripheral terminals. And the outer peripheral terminal and the inner peripheral terminal are connected to each other with a predetermined angle shift in the circumferential direction, and the outer peripheral terminal and the inner peripheral terminal are flush with each other. A short-circuit member provided with a short-circuit component member group arranged, wherein at least one pair of circumferentially adjacent end faces in the circumferential direction of the connecting portions are separated in the axial direction of the short-circuit member. Thus, the gist of the invention is that at least one of the two connecting portions that form a pair has a portion that is inclined with respect to the outer peripheral terminal when viewed from the longitudinal direction of the connecting portion.

  According to the same configuration, at least one pair of connecting portions has a portion where at least one of the two connecting portions forming a pair is inclined with respect to the outer peripheral side terminal when viewed from the longitudinal direction of the connecting portion. The end surfaces in the width direction adjacent to each other in the circumferential direction of the pair of connecting portions are separated in the axial direction of the short-circuit member. Therefore, the connecting portions forming a pair have a circumferential gap between the connecting portions as compared to the case where the end surfaces in the width direction adjacent to each other in the circumferential direction are not separated in the axial direction. Becomes wider. Therefore, when the short-circuit member is formed and when the short-circuit member is assembled, the circumferential distance between the connection portions is wide even when the connection portion is deformed by applying circumferential pressure to the connection portion. Therefore, it is possible to prevent the connection portions adjacent in the circumferential direction from being short-circuited. In addition, with a simple configuration in which at least one of the two connecting portions forming a pair is provided with a portion inclined with respect to the outer peripheral side terminal, a circumferential clearance between the connecting portions adjacent in the circumferential direction is provided. Can be wide.

  In the present invention, the “axial direction of the short-circuit member” is a direction perpendicular to the arrangement direction of the plurality of outer peripheral side terminals, and all the outer circumferences arranged in the circumferential direction when the short-circuit member is viewed from the direction. This is the direction in which the side terminal can be seen. The “pair of connecting portions” may be any two connecting portions adjacent in the circumferential direction. Further, in the present invention, “inclination with respect to the outer peripheral side terminal” includes a case where the connecting portion is disposed at a right angle with respect to the outer peripheral side terminal. Furthermore, in the present invention, “coplanar” means that the surface on one side in the axial direction of the short-circuit member at the outer peripheral side terminal and the inner peripheral side terminal is in the same plane.

  According to a third aspect of the present invention, in the short-circuit member according to the first or second aspect, all the connecting portions are adjacent to each other in the width direction adjacent to each other in the circumferential direction between the connecting portions adjacent in the circumferential direction. Is formed in the same shape so as to be separated in the axial direction of the short-circuit member.

  According to this configuration, all the connecting portions are formed in the same shape so that the end surfaces in the width direction adjacent to each other in the circumferential direction between the connecting portions adjacent in the circumferential direction are separated from each other in the axial direction of the short-circuit member. For this reason, all the connecting portions have the same strength. Therefore, it is possible to maintain a good balance of strength in the short-circuit member, and to suppress the formation of partially fragile parts. Moreover, since all the connection parts are formed so that the end surfaces in the width direction of the connection parts adjacent to each other in the circumferential direction are separated from each other in the axial direction of the short-circuit member, Even if a pressure is applied, it is suppressed that the connection parts adjacent in the circumferential direction are short-circuited.

  According to a fourth aspect of the present invention, in the short-circuit member according to the first or second aspect, the plurality of connecting portions are first connecting portions and second connecting portions that are alternately arranged in the circumferential direction. The gist is that each of the second connecting portions has an inclined shape with respect to the first connecting portion as viewed from the longitudinal direction of the connecting portion.

  According to the same configuration, not all the connecting portions are formed such that the end surfaces in the width direction of the connecting portions adjacent to each other in the circumferential direction are separated from each other in the axial direction of the short-circuit member. When the connecting portions are inclined one by one, the number of operations for inclining the connecting portions can be reduced as compared with the case where all the connecting portions are inclined. For example, when the connecting portions are inclined one by one using a mold, all the connecting portions are inclined by inclining only the second connecting portions except the first connecting portions. In comparison with this, the number of short-circuit members that can be manufactured with the same mold is increased. That is, the life of the mold can be extended with respect to the number of short-circuit members to be manufactured.

  According to a fifth aspect of the present invention, in the short-circuit member according to the first or second aspect, at least one pair of circumferentially adjacent connecting portions are adjacent to each other in the circumferential direction between the connecting portions in the circumferential direction. The gist of the present invention is to form shapes that are curved or bent in opposite directions as viewed from the longitudinal direction of the connecting portion so that they are opposite to each other.

  According to this configuration, at least a pair of circumferentially adjacent connecting portions are bent or bent in directions opposite to each other when viewed from the longitudinal direction of the connecting portion. End faces in the width direction adjacent to each other in the circumferential direction between adjacent connecting portions can be separated in the axial direction of the short-circuit member.

  The invention according to claim 6 short-circuits a plurality of segments arranged in the circumferential direction and the segments having the same potential when the outer peripheral terminal is connected to the segment. A commutator comprising the short-circuit member according to claim 1.

  According to the same configuration, in the short-circuit member provided in the commutator, at least one pair of connecting portions are spaced from each other in the widthwise end surfaces adjacent to each other in the circumferential direction of the connecting portion in the axial direction of the short-circuit member. . Therefore, the connecting portions forming a pair have a circumferential gap between the connecting portions as compared to the case where the end surfaces in the width direction adjacent to each other in the circumferential direction are not separated in the axial direction. Becomes wider. As a result, when forming the short-circuit member provided in the short-circuit member having a plurality of segments arranged in the circumferential direction and when assembling the short-circuit member, circumferential pressure is applied to the connection portion, and the connection portion is deformed. Even if it is a case, since the space | interval of the circumferential direction between connection parts is wide, it is suppressed that the connection parts adjacent to the circumferential direction are short-circuited.

According to a seventh aspect of the present invention, there are provided a stator having a magnet having a magnetic pole of 6 poles, a rotating shaft disposed inside the stator, and a rotating shaft and eight pieces that are fixed to the rotating shaft and extend radially. An armature comprising: a core having teeth; eight coils wound around the teeth; and the commutator according to claim 6 having 24 segments fixed to the rotating shaft;
It was set as the direct-current motor characterized by having.

  According to this configuration, in the short-circuit member provided in the commutator of the DC motor, at least one pair of connecting portions are spaced apart in the axial direction of the short-circuit member between the end surfaces in the width direction adjacent to each other in the circumferential direction of the connecting portion. is doing. Therefore, the connecting portions forming a pair have a circumferential gap between the connecting portions as compared to the case where the end surfaces in the width direction adjacent to each other in the circumferential direction are not separated in the axial direction. Becomes wider. As a result, even when the connecting portion is deformed by applying circumferential pressure to the connecting portion when the short-circuit member provided in the DC motor commutator is formed and when the short-circuit member is assembled, the connecting portion is deformed. Since the circumferential interval between the parts is wide, the connection parts adjacent in the circumferential direction are prevented from being short-circuited.

  The invention according to claim 8 includes a plurality of outer peripheral terminals arranged in the circumferential direction, inner peripheral terminals arranged in the same number as the outer peripheral terminals in the circumferential direction inside the outer peripheral terminals, and the outer peripheral terminals. And a connecting part that connects the outer peripheral side terminal and the inner peripheral side terminal with a predetermined angle shifted in the circumferential direction, respectively, and a method of manufacturing a short-circuit member group, A cutting step for forming a connection portion arranged in the circumferential direction by making a cut through the plate material in the thickness direction of the conductive plate material, and at least one pair of circumferentially adjacent widths of the connection portions adjacent to each other in the circumferential direction The gist of the invention is that it includes a connecting portion deformation step of pressurizing the connecting portion from both sides in the thickness direction of the conductive plate so that the end faces in the direction are separated from each other in the axial direction of the short-circuit member.

  According to this configuration, in the cutting step, the connecting portions arranged in the circumferential direction are formed by making a cut in the conductive plate material that penetrates in the thickness direction of the conductive plate material. In the connecting portion deformation step, the connecting portions are pressed from both sides in the plate thickness direction of the conductive plate material, and at least one pair of circumferentially adjacent end faces in the circumferential direction of the connecting portions adjacent in the circumferential direction are short-circuited. The members are separated in the axial direction. In the short-circuit member formed through these steps, at least the end faces in the width direction adjacent to each other in the circumferential direction of the connecting portions adjacent to each other in the circumferential direction are spaced apart in the axial direction of the short-circuit member. Therefore, in the short-circuit member formed through the above-described steps, the connecting portions forming a pair are not spaced apart from each other in the axial direction between the end surfaces in the circumferential direction adjacent to each other in the circumferential direction. Compared to the case, the circumferential gap between the connecting portions is widened. As a result, when forming the short-circuit member and assembling the short-circuit member, even if circumferential pressure is applied to the connecting portion and the connecting portion is deformed, the circumferential interval between the connecting portions is reduced. Since it is wide, it is suppressed that the connection parts adjacent in the circumferential direction are short-circuited.

  Further, the plurality of connecting portions arranged in the circumferential direction are formed by making cuts penetrating in the thickness direction of the conductive plate material in the conductive plate material in the cutting step. Therefore, for example, the yield can be improved as compared with the case where the slits are formed in the conductive plate material and the connecting portions arranged in the circumferential direction are formed.

  The invention according to claim 9 is the method of manufacturing a short-circuit member according to claim 8, wherein a plurality of outer peripheral side through holes provided in the circumferential direction and the inner side of the outer peripheral side through hole are provided before the cutting step. In the cutting step, a hole forming step for forming inner circumferential side through holes provided in the circumferential direction in the same number as the outer circumferential side through holes is performed in the circumferential direction. The conductive plate member is cut to the inner peripheral side through hole provided at a position shifted in angle to form the connecting portion, and the conductive plate member between the outer peripheral side through holes is cut to form the outer peripheral side terminal. The gist of the invention includes a terminal forming step of forming the inner peripheral terminal by cutting the conductive plate material between the inner peripheral through holes adjacent in the circumferential direction.

  According to this configuration, since the cutting step is performed after the outer peripheral side through hole and the inner peripheral side through hole are formed in the hole forming step, the outer peripheral side through hole and the inner peripheral side through hole are electrically conductive in the cutting step. It can be used as a mark when the connecting portion is formed by cutting the insulating plate material. Therefore, the cutting process can be performed more easily.

  The invention according to claim 10 includes a plurality of outer peripheral terminals arranged in the circumferential direction, inner peripheral terminals arranged in the same number as the outer peripheral terminals in the circumferential direction inside the outer peripheral terminals, and the outer peripheral terminals. And a connecting part that connects the outer peripheral side terminal and the inner peripheral side terminal with a predetermined angle shifted in the circumferential direction, respectively, and a method of manufacturing a short-circuit member group, A punching step of punching a plate material to form the connecting portions arranged in the circumferential direction by forming a plurality of slits arranged in the circumferential direction in the conductive plate material, and a circumferential direction of the connecting portions adjacent to each other in at least one pair of circumferential directions And a connecting portion deformation step of pressurizing the connecting portion from both sides in the plate thickness direction of the conductive plate so that end faces in the width direction adjacent to each other are spaced apart in the axial direction of the short-circuit member. It is a summary.

  According to this configuration, in the punching process, the conductive plate material is punched to form a connecting portion arranged in the circumferential direction on the conductive plate material. In the connecting portion deformation step, the connecting portions are pressed from both sides in the plate thickness direction of the conductive plate material, and at least one pair of circumferentially adjacent end faces in the circumferential direction of the connecting portions adjacent in the circumferential direction are short-circuited. The members are separated in the axial direction. In the short-circuit member formed through these steps, at least the end faces in the width direction adjacent to each other in the circumferential direction of the connecting portions adjacent to each other in the circumferential direction are spaced apart in the axial direction of the short-circuit member. Therefore, in the short-circuit member formed through the above-described steps, the connecting portions forming a pair are not spaced apart from each other in the axial direction between the end surfaces in the circumferential direction adjacent to each other in the circumferential direction. Compared to the case, the circumferential gap between the connecting portions is widened. As a result, when forming the short-circuit member and assembling the short-circuit member, even if circumferential pressure is applied to the connecting portion and the connecting portion is deformed, the circumferential interval between the connecting portions is reduced. Since it is wide, it is suppressed that the connection parts adjacent in the circumferential direction are short-circuited.

  Further, in the punching process, a plurality of slits arranged in the circumferential direction are formed in the conductive plate material to form a plurality of connecting portions, so that when the punching process is completed, a gap corresponding to the width of the slit is formed between the connecting portions. Exists. Further, in the connecting portion deformation step, the connecting portions are pressed from both sides in the plate thickness direction of the conductive plate material, and the end faces in the width direction adjacent to the circumferential direction of the connecting portions adjacent in the circumferential direction are set in the axial direction of the short-circuit member. Therefore, the gap between the connecting portions is further widened in the circumferential direction. Therefore, the gap in the circumferential direction between the connecting portions can be made wider than when the conductive plate member is cut to form the connecting portion, and the connecting portions adjacent in the circumferential direction are short-circuited. Can be suppressed.

  According to the present invention, a short-circuit member that can suppress short-circuiting between adjacent connecting portions in the circumferential direction, a commutator including the short-circuit member, a DC motor including the short-circuit member, and the short-circuit member A manufacturing method can be provided.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a radial sectional view of the DC motor of the present embodiment, and FIG. 2 is an axial sectional view of the DC motor. As shown in FIG. 1, the DC motor 1 includes a stator 2 and an armature 3 disposed inside the stator 2. The motor housing 4 constituting the stator 2 has a bottomed cylindrical shape, and six magnets 5 are fixed to the inner peripheral surface thereof at equal angular intervals in the circumferential direction. That is, the magnet 5 has a total of six magnetic poles. As shown in FIG. 2, the opening of the motor housing 4 is closed by a substantially disc-shaped end frame 6. The end frame 6 is integrally formed with a plurality (two in the present embodiment) of brush holders 7 having a cylindrical shape arranged along the radial direction. Each of the anode side brush 8 and the cathode side brush 9 connected to the power supply device is held.

  The armature 3 is rotatably arranged inside the six magnets 5 in the radial direction. The rotating shaft 11 constituting the armature 3 is rotatably supported by bearings 12a and 12b fixed to the center of the bottom of the motor housing 4 and the center of the end frame 6, respectively. One end of the rotary shaft 11 on the end frame 6 side protrudes from the center of the end frame 6 toward the outside of the motor housing 4.

  An armature core 13 is fixed to the rotary shaft 11 at a position facing the magnet 5 in the radial direction. As shown in FIG. 1, the armature core 13 includes eight teeth 13 a to 13 h extending along the radial direction of the rotating shaft 11, and eight slots 14 a to 13 by teeth 13 a to 13 h adjacent in the circumferential direction. 14h is formed. Coils 15a to 15h are wound around each of the teeth 13a to 13h in a concentrated manner so as to pass through the slots 14a to 14h, and the DC motor 1 has eight coils.

  Further, as shown in FIG. 2, a commutator 21 is fixed to the rotary shaft 11 at a position between the end frame 6 and the armature core 13. The commutator 21 includes an insulator 22 that is press-fitted and fixed to the rotating shaft 11, a plurality (24 in this embodiment) of segments 23 that are fixed to the outer peripheral surface of the insulator 22, and a segment that has the same potential. And a short-circuit member 24 for short-circuiting 23 to each other.

  The insulator 22 has a cylindrical shape in which a press-fit hole 22a is formed at the center in the axial direction, and protrudes toward the armature core 13 at the end of the press-fit hole 22a on the armature core 13 side. The annular boss 22b is integrally provided. As shown in FIG. 1, 24 segments 23 having a substantially strip shape are fixed to the outer peripheral surface of the insulator 22 at equal angular intervals in the circumferential direction. The 24 segments 23 are arranged with a gap between the segments 23 adjacent in the circumferential direction. Then, the anode side brush 8 and the cathode side brush 9 are slidably contacted with the 24 segments 23 from the radially outer side (see FIG. 2).

  As shown in FIG. 3, each of the 24 segments 23 has a connection claw 23a formed at the lower end in FIG. 3 (the end on the armature core 13 side in FIG. 2). Each connection claw 23 a has a substantially strip shape, and as shown in FIG. 1, the circumferential width of each connection claw 23 a is slightly shorter than the circumferential width of the segment 23. And each connection nail | claw 23a is formed so that the edge part of corresponding coil 15a-15h can be clamped by the front-end | tip turning back toward the center side of the commutator 21. FIG. The ends of the coils 15a to 15h sandwiched between the connection claws 23a are joined to the connection claws 23a by fusing or the like.

  Here, the connection state between the segment 23 and the ends of the coils 15a to 15h will be described in detail using a connection diagram of the DC motor 1 of the present embodiment shown in FIG. In the DC motor 1 of this embodiment, segment numbers “1” to “24” are assigned in order from the segment 23 arranged to face the teeth 13b in the counterclockwise direction (rightward in FIG. 6). I will decide.

  As shown in FIG. 6, the ends of the coils 15 a to 15 h are connected to eight pairs of segments 23 that form a pair adjacent to each other in the circumferential direction. Between the eight pairs of segments 23, one segment 23 to which the ends of the coils 15a to 15h are not connected is arranged one by one. For example, one end and the other end of the coil 15b are connected to the segments 23 having the segment numbers “1” and “2” that are adjacent to each other in the circumferential direction. The ends of any of the coils 15a to 15h are not connected to the segment 23 of the segment number “3”, and the coil 15c is connected to the segments 23 of the segment numbers “4” and “5” that are adjacent to each other in the circumferential direction. One end and the other end of each are connected. Similarly, every second segment number “6”, “9”, “12”, “15”, “18”, “21”, “24” from the segment 23 with the segment number “3”. Are not connected to any end of the coils 15a to 15h. Then, one end and the other end of the coil 15d are connected to the segment 23 having the segment numbers “7” and “8”, respectively, and one end and the other end of the coil 15e are connected to the segment 23 having the segment numbers “10” and “11”. Further, one end and the other end of the coil 15f are connected to the segment 23 having the segment numbers “13” and “14”, respectively. Further, one end and the other end of the coil 15g are connected to the segment 23 of the segment numbers “16” and “17”, respectively, and one end and the other end of the coil 15h are connected to the segment 23 of the segment numbers “19” and “20”. Further, one end and the other end of the coil 15a are connected to the segment 23 having the segment numbers “22” and “23”, respectively.

  Further, as shown in FIG. 3, each segment 23 has an end on the lower side (the armature core 13 side in FIG. 2) of the segment 23 in FIG. Further, the insulator 22 is fixed to the outer peripheral surface of the insulator 22 in a protruding state. And in the part which protruded rather than the lower end surface 22c of the insulator 22 in each segment 23, the connection recessed part 23b dented from the lower end in FIG. 3 of each segment 23 toward the upper end is provided in the radial direction inner side. ing.

  The short-circuit member 24 is disposed on the end face (see FIG. 2) of the insulator 22 on the armature core 13 side. The short-circuit member 24 includes two short-circuit member configuration groups (first short-circuit configuration member group 31 and second short-circuit configuration member group 32) that are conductive and have the same shape, and an insulating portion 33. 5A and 5B, the insulating member 33 is omitted and the short-circuit member 24 is illustrated.

  As shown in FIG. 5A, the first short-circuit component member group 31 includes 24 first outer peripheral side terminals 31a arranged in the circumferential direction and having a substantially rectangular plate shape, and the inner side of the first outer peripheral side terminal 31a. The 24 first inner peripheral side terminals 31b that are arranged in the circumferential direction and have a substantially trapezoidal plate shape are connected to the first outer peripheral side terminal 31a and the first inner peripheral side terminal 31b with a predetermined angle shift. It is comprised from the 1st connection part 31c.

  As shown in FIG. 3, the same number of first outer peripheral side terminals 31 a as the segments 23 are provided on each segment 23 with radially outer ends on the lower end surface 22 c in FIG. 3 of the insulator 22. It arrange | positions at equal angular intervals in the circumferential direction corresponding to the 24 segments 23 so that it may be arrange | positioned in the said connection recessed part 23b. The circumferential width of the first outer peripheral terminal 31a is formed to be substantially equal to the circumferential width of the connection recess 23b.

  The 24 first inner peripheral side terminals 31b are arranged at equiangular intervals around the boss portion 22b on the lower end surface 22c of the insulator 22 in FIG. Note that the circumferential positions of the 24 first outer peripheral terminals 31a coincide with the circumferential positions of the 24 first inner peripheral terminals 31b. The circumferential width of the first inner peripheral terminal 31b is slightly smaller than the circumferential width of the first outer peripheral terminal 31a. In addition, the plate thickness of each first inner peripheral terminal 31b is equal to the plate thickness of the first outer peripheral terminal 31a, and the center in the plate thickness direction of all the first inner peripheral terminals 31b is 24 first It exists in the plane containing the center of the plate | board thickness direction of the outer peripheral side terminal 31a. And as for the 1st outer peripheral side terminal 31a and the 1st inner peripheral side terminal 31b, the end surface of the both sides of the axial direction (same as the axial direction of the commutator 21) of the short circuit member 24 exists in the same plane, respectively.

  As shown in FIG. 5 (a), the 24 first connecting portions 31c connect the first outer peripheral side terminal 31a and the first inner peripheral side terminal 31b with a shift of 60 °, that is, 60 ° apart. It extends so as to connect the first outer peripheral side terminal 31a and the first inner peripheral side terminal 31b at the above positions. Specifically, each first connecting portion 31c has a curved shape along the involute curve, and when viewed from the axial direction (that is, the state shown in FIG. 5A), from each first outer peripheral side terminal 31a, It extends to the first inner peripheral side terminal 31b arranged at a position separated by 60 ° in the direction. And each 1st connection part 31c and each 1st outer peripheral side terminal 31a and 1st inner peripheral side terminal 31b connected by this 1st connection part 31c are formed integrally. Each of the first connecting portions 31c has a belt-like shape in which the cross-sectional shape along the plane orthogonal to the longitudinal direction is a quadrangle (in the present embodiment, a rectangle). Furthermore, the width | variety of each 1st connection part 31c is set to the width | variety which the 1st connection parts 31c adjacent to the circumferential direction are mutually non-contact.

  4A and 4B are side views of one first connecting portion 31c and the first outer peripheral side terminal 31a and the first inner peripheral side terminal 31b connected by the first connecting portion 31c. Show. 4A is a diagram of the first connecting portion 31c as viewed from the clockwise side of the first connecting portion 31c in FIG. 5A, and FIG. 4B is a diagram illustrating the first connecting portion 31c. FIG. 6 is a view of the first connecting portion 31c in FIG. 5A viewed from the counterclockwise direction. As shown in FIGS. 4 (a) and 4 (b), the first connecting portion 31c has a plate at the end in the width direction (substantially the same in the circumferential direction) at the end on the clockwise side and the end on the counterclockwise side. It is formed in a twisted shape by applying loads that are opposite to each other in the thickness direction. 4A, the load applied to the end of the first connecting portion 31c in the clockwise direction is indicated by an arrow α1, and FIG. 4B is a counterclockwise view of the first connecting portion 31c. The load applied to the end portion on the direction side is shown by an arrow α2. Since the 1st connection part 31c is formed in the shape twisted in this way, it connects the longitudinal direction (namely, 1st outer peripheral side terminal 31a and 1st inner peripheral side terminal 31b) of this 1st connection part 31c. When viewed from the (direction), it is inclined with respect to the outer peripheral side terminal 31a. Thus, the end surfaces 31d and 31e adjacent to each other in the circumferential direction of the first connecting portions 31c adjacent to each other in the circumferential direction are separated from each other in the axial direction of the short-circuit member 24 (same as the axial direction of the commutator 21). Further, as shown in FIG. 5B, the first connecting portion 31 c has a slightly curved shape such that the central portion in the longitudinal direction is separated from the second short-circuit constituting member group 32.

  As shown in FIGS. 5 (a) and 5 (b), the second short circuit component group 32 is arranged in the circumferential direction and has 24 second outer peripheral side terminals 32a having a substantially rectangular plate shape and second outer peripheral terminals. The 24 second inner peripheral side terminals 32b arranged in the circumferential direction inside the side terminal 32a and having a substantially trapezoidal plate shape, and the second outer peripheral side terminal 32a and the second inner peripheral side terminal 32b are shifted by a predetermined angle. It consists of 24 second connecting parts 32c to be connected.

  As shown in FIG. 3, the same number of second outer peripheral terminals 32a as the segments 23 have the same shape as the first outer peripheral terminal 31a, and are circumferentially stacked on the first outer peripheral terminal 31a. They are arranged at equiangular intervals. As shown in FIGS. 5A and 5B, the 24 second inner peripheral terminals 32b have the same shape as the first inner peripheral terminal 31b, and the first inner peripheral terminal 31b Arranged to be stacked. And the plate | board thickness of each 2nd inner peripheral side terminal 32b is equal to the plate | board thickness of the 2nd outer peripheral side terminal 32a, and the center of the plate | board thickness direction of all the 2nd inner peripheral side terminals 32b is 24 2nd. It exists in the plane containing the center of the plate | board thickness direction of the outer peripheral side terminal 32a. And as for the 2nd outer peripheral side terminal 32a and the 2nd inner peripheral side terminal 32b, the end surface of the both sides of the axial direction (same as the axial direction of the commutator 21) of the short circuit member 24 exists in the same plane, respectively.

  The 24 second connecting portions 32c connect the second outer peripheral side terminal 32a and the second outer peripheral side terminal 32a with a shift of 60 °, that is, the second outer peripheral side terminal 32a and the second outer peripheral side terminal 32a located at 60 ° apart. 2 extends so as to connect to the inner peripheral terminal 32b. Specifically, each second connecting portion 32c has a curved shape along the involute curve, and when viewed from the upper side in the axial direction (that is, the state shown in FIG. 5A), from each second outer peripheral side terminal 32a, It extends to the second inner peripheral side terminal 32b arranged at a position separated by 60 ° in the clockwise direction. And each 2nd connection part 32c and each 2nd outer peripheral side terminal 32a and 2nd inner peripheral side terminal 32b connected by this 2nd connection part 32c are formed integrally. Each of the second connecting portions 32c has a strip shape with a quadrangular cross section (rectangular in this embodiment) along a plane orthogonal to the longitudinal direction. Furthermore, the width of each second connecting portion 32c is set to a width such that the second connecting portions 32c adjacent in the circumferential direction are not in contact with each other.

  Here, FIGS. 4C and 4D are side views of one second connecting portion 32c and the second outer peripheral side terminal 32a and the second inner peripheral side terminal 32b connected by the second connecting portion 32c. Show. 4 (c) is a view of the second connecting portion 32c as seen from the clockwise side of the second connecting portion 32c in FIG. 5 (a), and FIG. 4 (d) shows the second connecting portion 32c. FIG. 6 is a view of the second connecting portion 32c in FIG. 5A viewed from the counterclockwise direction. As shown in FIGS. 4 (c) and 4 (d), the second connecting portion 32c has a plate at the end in the width direction (substantially the same in the circumferential direction) at the end on the clockwise side and the end on the counterclockwise side. It is formed in a twisted shape by applying loads that are opposite to each other in the thickness direction. In FIG. 4C, the load applied to the end of the second connecting portion 32c in the clockwise direction is shown by an arrow β1, and in FIG. 4D, the counterclockwise of the second connecting portion 32c is shown. The load applied to the end portion on the direction side is shown by an arrow β2. Since the second connecting portion 32c is formed in such a twisted shape, the longitudinal direction of the second connecting portion 32c (that is, the direction connecting the second outer peripheral side terminal 32a and the second outer peripheral side terminal 32b). ) Is inclined with respect to the outer peripheral side terminal 32a. As a result, the end surfaces 32d and 32e adjacent to each other in the circumferential direction of the second connecting portions 32c adjacent to each other in the circumferential direction are separated from each other in the axial direction of the short-circuit member 24 (same as the axial direction of the commutator 21). Further, as shown in FIG. 5B, the second connecting portion 32 c has a shape that is slightly curved so that the central portion in the longitudinal direction is separated from the first short-circuit constituting member group 31.

  As shown in FIG. 5 (a), the first short circuit component group 31 and the second short circuit component group 32 have a plate thickness such that the first connection portion 31c and the second connection portion 32c are opposite to each other. Laminated in the direction. And 1st outer peripheral side terminal 31a and 2nd outer peripheral side terminal 32a laminated | stacked on the plate | board thickness direction, and 1st inner peripheral side terminal 31b and 2nd inner peripheral side terminal 32b are joined by welding, respectively. Electrically connected. In the first short circuit component group 31 and the second short circuit component group 32 laminated in this way, the first connection part 31c and the second connection part 32c are formed in curved shapes that are away from each other. It is suppressed that the 1st connection part 31c and the 2nd connection part 32c mutually contact.

  As shown in FIG. 3, the insulating portion 33 made of an insulating resin material is provided between the first connecting portions 31 c arranged in the circumferential direction, between the second connecting portions 32 c also arranged in the circumferential direction, and further laminated. It is formed so as to fill a gap between the first connecting part 31c and the second connecting part 32c arranged in the direction. Accordingly, the insulating portion 33 is formed between the first connecting portions 31c adjacent in the circumferential direction, between the second connecting portions 32c adjacent in the circumferential direction, and between the first connecting portion 31c and the second connecting portion 32c arranged in the stacking direction. By interposing, it prevents that the 1st connection parts 31c, the 2nd connection parts 32c, and also the 1st connection part 31c and the 2nd connection parts 32c contact (short-circuit).

  The short-circuit member 24 configured as described above is disposed around the boss portion 22b on the lower end surface 22c in FIG. 3 of the insulator 22, and the first outer peripheral side terminal 31a and the second outer peripheral surface are stacked. The side terminals 32a are arranged in the connection recesses 23b of the segments 23, respectively. In this state, the first outer peripheral side terminal 31 a and the second outer peripheral side terminal 32 a are electrically connected to the corresponding segment 23. In addition, the electrical connection with the segment 23 corresponding to the 1st outer peripheral side terminal 31a and the 2nd outer peripheral side terminal 32a may be based on contact | abutting, and may be based on crimping, welding, etc.

  In addition, the short-circuit member 24 includes a first connection portion 31c that connects the first outer peripheral side terminal 31a and the first inner peripheral side terminal 31b that are arranged at an interval of 60 ° in the circumferential direction, and 60 in the circumferential direction. A second connecting portion 32c that connects the second outer peripheral side terminal 32a and the second inner peripheral side terminal 32b, which are arranged with an interval, is formed by laminating in the opposite direction. Therefore, when each of the first outer peripheral side terminals 31a and the second outer peripheral side terminals 32a are electrically connected to the corresponding segments 23, as shown in FIG. Is short-circuited.

  In the DC motor 1 configured as described above, as shown in FIGS. 1 and 2, current is selectively supplied from an external power supply device to the coils 15 a to 15 h via the anode side brush 8 and the cathode side brush 9. Then, the armature 3 rotates according to the rotating magnetic field generated by the coils 15a to 15h. Since the commutator 21 rotates when the armature 3 rotates, the segments 23 that are in sliding contact with the anode side brush 8 and the cathode side brush 9 are switched, and the coils 15a to 15h are sequentially rectified.

Next, the manufacturing method of the short circuit member 24 comprised as mentioned above is demonstrated.
First, a punching process is performed. In the punching process, as shown in FIG. 7, a flat conductive plate 51 having conductivity (for example, a copper plate) is punched, and the first connecting portion 31 c in one first short circuit component group 31 or one first The 2nd connection part 32c in the 2 short circuit component group 32 is formed. The case of manufacturing the first short circuit component group 31 will be described in detail as an example. In this punching step, the conductive plate material 51 is punched to form 24 slits 52 arranged in the circumferential direction. Each slit 52 includes an outer peripheral side separation portion 52 a having a circumferential width equal to the distance between the first outer peripheral side terminals 31 a in the first short-circuit constituent member group 31, and the first inner peripheral side in the first short-circuit constituent member group 31. An inner circumferential side separation portion 52b having a circumferential width equal to the distance between the terminals 31b, and an outer circumferential side separation portion 52a and an inner circumferential side separation portion 52b that are shifted by a predetermined angle (60 ° in this embodiment). The connecting / separating portion 52c is provided so as to communicate with each other. Each connecting / separating portion 52c has a curved shape along an involute curve, and has a circumferential width equal to the distance between the first connecting portions 31c in the first short-circuit component member group 31. The conductive plate member 51 between the outer peripheral side separation portions 52a becomes the first outer peripheral side terminal 31a, and the conductive plate member 51 between the inner peripheral side separation portions 52b becomes the first inner peripheral side terminal 31b. The conductive plate member 51 between the parts 52c becomes the first connecting part 31c. The 24 slits 52 are formed by punching the conductive plate 51 so that the outer peripheral side connecting portion 53 is provided on the outer peripheral side and the inner peripheral side connecting portion 54 is provided on the inner peripheral side. Therefore, the conductive plate material 51 between the slits 52 is prevented from being separated by the outer peripheral side connecting portion 53 and the inner peripheral side connecting portion 54.

  In this punching process, when forming the 2nd connection part 32c in the 2nd short circuit component group 32, similarly to the case where the 1st connection part 31c in the 1st short circuit component group 31 is formed, conductive plate material 51 is used. 24 slits 52 are formed by punching.

  Next, a connection part deformation | transformation process is performed. In the connecting portion deformation step, as shown in FIG. 8, the first connecting portion 31 c (or the second connecting portion 32 c) in the conductive plate 51 in which 24 slits 52 are formed is molded from both sides in the plate thickness direction. Pressurize with (not shown). The first connecting portion 31c (or the second connecting portion 32c) is formed by using a die at the end in the width direction (substantially the same in the circumferential direction) of the first connecting portion 31c and the counterclockwise end. Loads that are opposite to each other in the plate thickness direction are applied to the end portions of the plate to form a twisted shape (see FIGS. 4A to 4D). And the 1st connection part 31c (or 2nd connection part 32c) is formed in the shape twisted in this way, By this, the end surfaces 31d and 31e adjacent to the circumferential direction of the 1st connection part 31c adjacent to the circumferential direction The ends (or the end faces 32d and 32e) are separated in the axial direction of the short-circuit member 24 (same as the axial direction of the commutator 21).

  Further, in the connecting portion deformation step, when the first connecting portion 31c (or the second connecting portion 32c) is pressed and deformed by the mold, the first connecting portion 31c (or the second connecting portion 32c) is electrically conductive. In order to obtain a curved shape that slightly protrudes in the plate thickness direction of the conductive plate material 51, the same plate is pressed.

  In this connection part deformation process, in electroconductive board material 51, the part used as the 1st perimeter side terminal 31a (or the 2nd perimeter side terminal 32a) between perimeter side separation parts 52a, and between perimeter side separation parts 52b The part which becomes the first inner peripheral side terminal 31b (or the second outer peripheral side terminal 32a) is not deformed and remains flat. FIG. 8 shows a state in which two conductive plate members 51 are laminated. In this connecting portion deformation step, the conductive plate members 51 are pressed one by one with a mold. Therefore, in the connecting portion deformation step, the conductive plate material 51 to be the first short circuit component group 31 and the conductive plate material 51 to be the second short circuit component group 32 are not laminated.

  Next, a lamination process is performed. In the laminating step, as shown in FIG. 8, the two conductive plate members 51, that is, the conductive plate member 51 that becomes the first short-circuit component member group 31 and the conductive plate member 51 that becomes the second short-circuit member group 32, The 1st connection part 31c and the 2nd connection part 32c are laminated | stacked so that it may become reverse direction. At this time, the two conductive plate members 51 are stacked such that the curved first connecting portion 31 c and second connecting portion 32 c are in a state of moving away from each other in the plate thickness direction of the conductive plate member 51. And the site | part used as the 1st outer peripheral side terminal 31a between the outer peripheral side separation parts 52a, the site | part used as the 2nd outer peripheral side terminal 32a, the site | part used as the 1st inner peripheral side terminal 31b between the inner peripheral side separation parts 52b, and The parts to be the second outer peripheral side terminals 32a are joined by welding (for example, spot welding).

  Next, an insulating part forming step is performed. In the insulating portion forming step, the insulating portion 33 is formed as shown in FIG. First, the two electroconductive plate materials 51 laminated in the laminating step are arranged in a molding die (not shown). Then, a molten insulating resin material is injected into the molding die, and between the first connecting portions 31c arranged in the circumferential direction, between the second connecting portions 32c arranged in the circumferential direction, and in the stacking direction. The insulating resin material is filled in a gap between the first connecting portion 31c and the second connecting portion 32c arranged side by side. At this time, the molten insulating resin material flows between the first connecting portions 31 c and the second connecting portions 32 c along the axial direction of the short-circuit member 24. Then, after the insulating resin material is cured to form the insulating portion 33, the two conductive plate members 51 are taken out from the molding die.

  Next, a terminal formation process is performed. In the terminal forming step, the two conductive plate members 51 stacked along the alternate long and short dash line shown in FIG. 9 are punched out, and the inner peripheral side connecting portion 54 and the outer peripheral side connecting portion 53 are removed. Thereby, the 1st and 2nd outer peripheral side terminals 31a and 32a and the 1st and 2nd inner peripheral side terminals 31b and 32b are formed, and the short circuit member 24 is completed.

As described above, according to the first embodiment, the following operations and effects are provided.
(1) In the short-circuit member 24, the end faces 31d and 31e in the width direction adjacent to each other in the circumferential direction between the first coupling portions 31c adjacent in the circumferential direction are in the axial direction of the short-circuit member 24 (in the axial direction of the commutator 21). The same). Thus, when the end surfaces 31d and 31e in the width direction adjacent to each other in the circumferential direction between the first connection portions 31c adjacent in the circumferential direction are separated from each other in the axial direction of the short-circuit member 24, the first connection portions adjacent in the circumferential direction. The clearance gap between 31c can be made wide compared with the case where the end surfaces of the width direction adjacent to the circumferential direction of the connection part adjacent to the circumferential direction are not separated in the axial direction. Similarly, in the second short-circuit component member group 32, the end faces 32 d and 32 e in the width direction adjacent to each other in the circumferential direction between the second coupling portions 32 c adjacent in the circumferential direction are separated from each other in the axial direction of the short-circuit member 24. Accordingly, the gap between the second connecting portions 32c adjacent in the circumferential direction becomes wider than in the case where the end surfaces in the width direction adjacent to each other in the circumferential direction of the connecting portions adjacent in the circumferential direction are not separated in the axial direction. Therefore, in the insulating portion forming step, when the insulating resin material melted between the first connecting portions 31c and between the second connecting portions 32c is filled, the first and second connecting portions are formed by the molding pressure when forming the insulating portion 33. Even when 31c and 32c are deformed in the circumferential direction, the circumferential gaps between the first coupling portions 31c and the second coupling portions 32c are wide, so the first coupling portions 31c adjacent to each other in the circumferential direction and It is suppressed that the 2nd connection parts 32c are short-circuited. Further, when the first and second short circuit component groups 31 and 32 are stacked, even if pressure is applied in the circumferential direction to the first connection part 31c and the second connection part 32c by some external force, the first Since the circumferential gap between the coupling portions 31c and the second coupling portion 32c is wide, the first coupling portions 31c and the second coupling portions 32c adjacent in the circumferential direction are prevented from being short-circuited.

  (2) As shown in FIGS. 4A to 4D, the first connecting portion 31c and the second connecting portion 32c have an end in the clockwise direction and an end in the counterclockwise direction at the end in the width direction. The part is formed in a twisted shape by applying loads that are opposite to each other in the plate thickness direction. Therefore, the first connecting portion 31c and the second connecting portion 32c are inclined with respect to a plane orthogonal to the axial direction of the short-circuit member 24 (the same as the axial direction of the commutator 21). In the insulating portion forming step, the molten insulating resin material flows between the first connecting portions 31 c and the second connecting portions 32 c along the axial direction of the short-circuit member 24. Therefore, the projected area of the first connecting portion 31c and the second connecting portion 32c in the flowing direction of the molten insulating resin material (that is, the axial direction of the short-circuit member 24) is twisted by the first connecting portion 31c and the second connecting portion 32c. This is smaller than the case where the first connecting portion 31c and the second connecting portion 32c are not parallel to the plane perpendicular to the axial direction of the short-circuit member 24. The “projection areas of the first connecting portion 31c and the second connecting portion 32c” are the same direction when the first connecting portion 31c and the second connecting portion 32c are projected along the direction in which the insulating resin material flows. This is the area of the shadow projected on the orthogonal plane. Therefore, when the insulating resin material is injected into the molding die, the pressure applied from the insulating resin material to the first connecting portion 31c and the second connecting portion 32c becomes smaller. As a result, in the insulating part forming step, the first connecting part 31c and the second connecting part 32c are not easily deformed, and therefore the first connecting parts 31c and the second connecting parts 32c adjacent in the circumferential direction are short-circuited. This is more suppressed.

  (3) The 1st connection part which adjoins the circumferential direction by simple structure which only inclines the 1st connection part 31c and the 2nd connection part 32c with respect to the 1st outer peripheral side terminal 31a and the 2nd outer peripheral side terminal 32a. The clearance in the circumferential direction between 31c and between the second connecting portions 32c can be widened. Moreover, the clearance gap between the 1st connection parts 31c and the 2nd connection parts 32c which adjoin the circumferential direction is reduced, without reducing the area of the cross section of the 1st connection part 31c and the 2nd connection part 32c cut along the width direction. Can be wide. Therefore, while preventing the electrical resistance in the 1st connection part 31c and the 2nd connection part 32c from increasing, the short circuit of the 1st connection parts 31c adjacent to the circumferential direction and the 2nd connection parts 32c is suppressed. Can do.

  (4) In all the first connecting portions 31 c, the end faces 31 d and 31 e in the width direction adjacent to each other in the circumferential direction between the first connecting portions 31 c adjacent in the circumferential direction are separated from each other in the axial direction of the short-circuit member 24. Are formed in the same shape. Similarly, the end faces 32d and 32e in the width direction adjacent to each other in the circumferential direction of the second connection parts 32c adjacent in the circumferential direction are separated from each other in the axial direction of the short-circuit member 24. Are formed in the same shape. Therefore, since all the 1st connection parts 31c and the 2nd connection parts 32c have the same intensity | strength, the balance of the intensity | strength in the short circuit member 24 can be kept favorable, and a partially weak part is formed. Can be suppressed. Moreover, all the 1st and 2nd connection parts 31c and 32c are the edge parts 31d, 31e, 32d, and 32e of the width direction which 1st connection parts 31c and the 2nd connection parts 32c which adjoin each other in the circumferential direction oppose each other. Are formed so as to be separated from each other in the axial direction of the short-circuit member 24, the first connecting portion 31 c and the second connecting portion 31 c and the second connecting portion 31 c adjacent to each other in the circumferential direction can be applied to any of the connecting portions 31 c and 32 c. It is suppressed that the connection parts 32c are short-circuited.

  (5) In the punching process, a plurality of slits 52 arranged in the circumferential direction in the conductive plate material 51 are formed to form the plurality of first connecting portions 31c and the second connecting portions 32c. Thus, a gap corresponding to the width of the slit 52 (connection separation portion 52c) exists between the first connection portions 31c and the second connection portions 32c. Further, in the connecting portion deformation step, the first and second connecting portions 31c and 32c are pressed from both sides in the plate thickness direction of the conductive plate 51, and the first connecting portions 31c adjacent to each other in the circumferential direction and the second connecting portions. In order to separate the end faces 31d, 31e, 32d, 32e adjacent to each other in the circumferential direction between the first coupling portions 31c in the axial direction of the short-circuit member 24, the gaps between the first coupling portions 31c and the second coupling portions 32c are circumferential. It becomes wider in the direction. Therefore, the circumferential gap between the first connecting portions 31c and the second connecting portions 32c can be made wider than in the case where the connecting portions are formed by cutting the conductive plate material 51, and adjacent to each other in the circumferential direction. It can suppress more that the suitable 1st connection parts 31c and 2nd connection parts 32c are short-circuited.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
FIG. 11 is a plan view showing a short-circuit constituting member group 72 constituting the short-circuit member 71 of the second embodiment. The short-circuit member 71 is formed by laminating two short-circuit constituent member groups 72. And the short circuit member 71 which consists of two short circuit component members 72 is equipped with the commutator 21 of the DC motor 1 instead of the short circuit member 24 of the said 1st Embodiment (refer FIG. 2).

  The short-circuit component group 72 includes 24 outer peripheral terminals 72a that are arranged in the circumferential direction and form a rectangular plate shape, and 24 inner terminals that are arranged in the circumferential direction inside the outer peripheral terminal 72a and form a substantially trapezoidal plate shape. The peripheral terminal 72b is composed of 24 connecting portions 72c that connect the outer peripheral terminal 72a and the inner peripheral terminal 72b with a predetermined angle shift.

  The same number of outer peripheral side terminals 72a as the segments 23 (see FIG. 3) provided in the commutator 21 are arranged at their radially outer ends in connection recesses 23b (see FIG. 3) provided in the segments 23. As shown, the 24 segments 23 are arranged at equiangular intervals in the circumferential direction. The circumferential width of these outer peripheral terminals 72a is formed to be substantially equal to the circumferential width of the connection recess 23b. The thickness of each inner peripheral terminal 72b is equal to the thickness of the outer peripheral terminal 72a, and the center of the thickness direction of all inner peripheral terminals 72b is the thickness direction of the 24 outer peripheral terminals 72a. Lies in the plane containing the center of And the outer peripheral side terminal 72a and the inner peripheral side terminal 72b have both end surfaces of the short-circuit member 71 in the same plane in the axial direction (the vertical direction in FIG. 11).

  The 24 connecting portions 72c connect the outer peripheral terminal 72a and the inner peripheral terminal 72b so that the outer peripheral terminal 72a and the inner peripheral terminal 72b are shifted by 60 °, that is, the outer peripheral terminal 72a and the inner peripheral terminal 72b that are 60 ° apart are connected. Extends to connect. Specifically, in FIG. 11, the connecting portion 72 c has a curved shape along the involute curve, and from each outer peripheral terminal 72 a to the inner peripheral terminal 72 b disposed at a position 60 ° counterclockwise. It extends.

  Moreover, each connection part 72c has comprised the strip | belt shape where the cross-sectional shape along the surface orthogonal to the longitudinal direction is a tetragon | quadrangle (this embodiment rectangular shape). And the annular outer peripheral side insulation part 73 is provided in the edge part by the side of the outer peripheral side terminal 72a in 24 connection parts 72c, and the edge part by the side of the inner peripheral side terminal 72b in the connection part 72c is provided. Is provided with an annular inner peripheral insulating portion 74. Further, between the end portions on the outer peripheral side terminal 72a side of the connecting portions 72c adjacent in the circumferential direction, an outer peripheral side separated insulating portion 73a constituting the outer peripheral side insulating portion 73 is interposed and adjacent in the circumferential direction. Between the end portions on the inner peripheral side terminal 72b side of the connecting portion 72c, an inner peripheral side separation insulating portion 74a constituting the inner peripheral side insulating portion 74 is interposed.

  Further, in each of the connecting portions 72c, a portion between the outer peripheral side insulating portion 73 and the inner peripheral side insulating portion 74 has one end portion in the width direction (the end portion on the clockwise side in FIG. 11) in the axial direction. By forming the raised shape, the outer peripheral side terminal 72a and the inner peripheral side terminal 72b are inclined. FIG. 10A shows an end view of the connecting portion 72c when the connecting portion 72c is cut along a direction orthogonal to the longitudinal direction. As shown in FIG. 10A, since the connecting portion 72c is inclined with respect to the outer peripheral side terminal 72a, the end surfaces 72d and 72e in the width direction adjacent to each other in the circumferential direction of the connecting portion 72c adjacent in the circumferential direction are The short circuit component group 72 is spaced apart in the thickness direction (same as the axial direction of the short circuit member 71). In addition, the width | variety of the connection part 72c of this embodiment is flat form parallel to the outer peripheral side terminal 72a and the inner peripheral side terminal 72b, as shown by the dashed-two dotted line in Fig.10 (a). In such a case, the end portions 72d and 72e in the width direction adjacent to each other in the circumferential direction of the connecting portions 72c adjacent to each other in the circumferential direction are in contact with each other.

  As shown in FIG. 11, the short-circuit member 71 is formed by laminating two short-circuit component member groups 72 configured as described above so that the connecting portions 72 c are in opposite directions. And the two short circuit component group 72 is laminated | stacked so that mutual outer peripheral side terminals 72a and mutual inner peripheral side terminals 72b may contact | abut in the lamination direction. The laminated outer peripheral terminals 72a and the laminated inner peripheral terminals 72b are electrically joined by welding. In addition, in the two short circuit component group 72 laminated | stacked so that the short circuit member 71 may be comprised, the connection part 72c of one short circuit component group 72 and the connection part 72c of the other short circuit component group 72 are the lamination direction. Are slightly curved so as to be separated from each other, and the connecting portions 72c are prevented from contacting each other.

Next, the manufacturing method of the short circuit member 71 comprised as mentioned above is demonstrated.
First, a hole forming process is performed. In the hole forming step, as shown in FIG. 12, 24 outer peripheral side through holes 82 and 24 inner peripheral side through holes 83 are punched and formed in a flat conductive plate material 81 (for example, a copper plate) having conductivity. Is done. The 24 outer peripheral through holes 82 are provided at equiangular intervals in the circumferential direction, and 24 inner peripheral through holes 83 are equidistant in the circumferential direction inside the 24 outer peripheral through holes 82. Is provided. The 24 outer circumferential through holes 82 and the 24 inner circumferential through holes 83 are formed so that their circumferential positions coincide with each other, and each outer circumferential through hole 82 has an inner circumferential through hole 83. Opposed in the radial direction. In addition, each outer peripheral side through-hole 82 is formed at a position that coincides with the end portion on the outer peripheral side terminal 72a side of the connecting portion 72c adjacent in the circumferential direction in the short circuit component group 72 to be formed. The circumferential side through-hole 83 is formed at a position that coincides with the end portion on the inner circumferential side terminal 72b side of the connecting portion 72c adjacent in the circumferential direction in the short-circuit component member group 72 to be formed.

  Next, a cutting process is performed. In the cutting step, as shown in FIG. 12, the conductive plate material 81 is cut to the inner peripheral side through-holes 83 at positions shifted by 60 ° from the respective outer peripheral side through-holes 82 to form 24 cut portions 84. . In FIG. 12, each cutting portion 84 extends from each outer peripheral side through hole 82 to the inner peripheral side through hole 83 at a position shifted by 60 ° in the counterclockwise direction, and in the thickness direction of the conductive plate 81. As seen from the figure, it has a curved shape along the involute curve. By providing the cutting portion 84 in this way, the connecting portion 72 c is formed between the cutting portions 84.

  Next, an insulating part forming step is performed. In the insulating portion forming step, first, the conductive plate 81 in which the outer peripheral side through hole 82, the inner peripheral side through hole 83, and the cutting portion 84 are formed is placed in a molding die (not shown). Thereafter, the molten insulating resin material is injected into the molding die, and the insulating resin material is filled into the outer peripheral side through hole 82 and the inner peripheral side through hole 83. Then, when the insulating resin material injected into the mold is cured, as shown in FIG. 13, an outer peripheral side separation insulating portion 73 a is formed in the outer peripheral side through hole 82, and the inner peripheral side through hole 83 is formed. The inner peripheral side separation insulating portion 74a is formed on the inner surface. Further, an annular outer peripheral insulating portion 73 passing over the opening on one end side of the outer peripheral side through hole 82 is formed integrally with the outer peripheral side separating insulating portion 73a, and the opening on one end side of the inner peripheral side through hole 83 is formed. An annular inner peripheral insulating part 74 passing over the part is formed integrally with the inner peripheral separating insulating part 74a. The outer peripheral side insulating portion 73 is formed so that its radial width is slightly smaller than the diameter of the outer peripheral side through-hole 82, and the inner peripheral side insulating portion 74 has its radial width equal to the inner peripheral side through hole. It is formed slightly smaller than the diameter of 83. The conductive plate 81 is taken out from the mold after the insulating material injected into the mold is cured.

  Next, a terminal formation process is performed. In the terminal forming step, the conductive plate 81 is punched out along the alternate long and short dash line shown in FIG. 13 to form the outer peripheral side terminal 72a and the inner peripheral side terminal 72b. At this time, one outer peripheral terminal 72 a is formed between each outer peripheral through hole 82, and the outer peripheral edge of the outer peripheral insulating portion 73 passes through the outer peripheral through hole 82 between the outer peripheral terminals 72 a. Is punched along. Similarly, one inner peripheral terminal 72b is formed between each inner peripheral through hole 83, and the inner peripheral insulation 72b passes through the inner peripheral through hole 83 between the inner peripheral terminals 72b. It is punched along the inner peripheral edge of the portion 74.

  Next, a connection part deformation | transformation process is performed. In the connecting portion deformation step, as shown in FIG. 11, the 24 connecting portions 72c are pressurized with a mold (not shown) from both sides in the plate thickness direction. The connecting portion 72c is applied with a load opposite to each other in the plate thickness direction at the end portion in the width direction of the connecting portion 72c and the end portion on the counterclockwise direction by the mold, One end in the width direction (the end on the clockwise side in FIG. 11) is formed in a shape raised in the axial direction (see FIG. 10A). Accordingly, the connecting portion 72c is inclined with respect to the portion other than the connecting portion 72c in the conductive plate 81, and the end faces 72d and 72e in the width direction adjacent to each other in the circumferential direction of the connecting portion 72c adjacent in the circumferential direction are The short circuit component group 72 is spaced apart in the thickness direction (the same as the axial direction of the short circuit member 71).

  Further, in the connecting portion deformation step, when the connecting portion 72c is pressed and deformed with a mold, the connecting portion 72c is curved so as to slightly protrude in the plate thickness direction of the outer peripheral side terminal 72a and the inner peripheral side terminal 72b. Pressurize with the same mold to make the shape. In this connection portion deformation step, the portions other than the connection portion 72c in the conductive plate 81 are not deformed and remain flat.

  Next, a lamination process is performed. In the stacking step, two short-circuit constituent member groups 72 completed through the connecting portion deformation step are stacked. More specifically, one short-circuit component member group 72 and the other short-circuit component member group 72 are connected to each other on the outer peripheral side terminals 72a and on the inner peripheral side of each other so that the connecting portions 72c are opposite to each other. The terminals 72b are stacked so that the terminals 72b abut each other. Then, after the two short-circuit constituting member groups 72 are laminated, the laminated outer peripheral terminals 72a and the laminated inner peripheral terminals 72b are joined by welding (for example, spot welding). Thus, the short-circuit member 71 is completed.

As described above, the second embodiment has the following effects.
(1) In the short-circuit member 71, the end surfaces 72d and 72e in the width direction adjacent to each other in the circumferential direction between the connecting portions 72c adjacent in the circumferential direction are in the axial direction of the short-circuit member 71 (the same in the axial direction of the commutator 21). Are separated. As described above, when the end surfaces 72d and 72e in the width direction adjacent to each other in the circumferential direction between the connecting portions 72c adjacent in the circumferential direction are separated from each other in the axial direction of the short-circuit member 71, a gap between the connecting portions 72c adjacent in the circumferential direction. Can be made wider than the case where the end faces in the width direction adjacent to each other in the circumferential direction of the connecting portions adjacent in the circumferential direction are not separated in the axial direction. As a result, for example, when assembling the short-circuit member 71 to the insulator 22, even if pressure is applied in the circumferential direction to the coupling portion 72c by some external force, the circumferential gap between the coupling portions 72c is wide. For this reason, the connecting portions 72c adjacent in the circumferential direction are prevented from being short-circuited.

  (2) With a simple configuration in which the connecting portion 72c is simply inclined with respect to the outer peripheral side terminal 72a, the gap between the connecting portions 72c adjacent in the circumferential direction can be widened. And since the clearance gap between the connection parts 72c adjacent to the circumferential direction can be enlarged, without reducing the area of the cross section of the connection part 72c cut along the width direction, the electrical resistance in the connection part 72c is increased. While preventing this, it is possible to suppress a short circuit between the connecting portions 72c adjacent in the circumferential direction.

  (3) The plurality of connecting portions 72c arranged in the circumferential direction are formed by making cuts penetrating the conductive plate 81 in the thickness direction of the conductive plate 81 in the cutting step. Therefore, for example, the yield can be improved as compared with the case where the slits 52 are formed in the conductive plate 51 to form the connecting portions arranged in the circumferential direction as in the first embodiment. Further, since the width in the circumferential direction of the connecting portion 72c is increased by the amount that the slit 52 is not formed, when the outer diameter of the short-circuit member 71 is equal to the outer diameter of the short-circuit member 24 of the first embodiment, the width The area of the cross section of the connecting portion 72c cut along the direction increases. As a result, the electrical resistance at the connecting portion 72c can be further reduced.

  (4) Since the cutting step is performed after the outer peripheral side through hole 82 and the inner peripheral side through hole 83 are formed in the hole forming step, the outer peripheral side through hole 82 and the inner peripheral side through hole 83 are changed in the cutting step. It can be used as a mark when the cut portion 84 is formed in the conductive plate 81 to form the connecting portion 72c. Therefore, the cutting process can be performed more easily.

In addition, you may change embodiment of this invention as follows.
-In short circuit member 24 of the 1st embodiment of the above, all connection parts 31c and 32c incline to perimeter side terminals 31a and 32a seeing from the longitudinal direction of connection parts 31c and 32c. However, it is not necessary to incline all the connection parts 31c and 32c with respect to the outer peripheral side terminals 31a and 32a. For example, in the short circuit component group 101 shown in FIG. 14A, every other connecting portion 101c is inclined with respect to the outer peripheral side terminal 101a. Here, the connecting part 101c which is not inclined will be described in detail as the first connecting part 111, and the inclined connecting part 101c will be described as the second connecting part 112. At the end in the width direction of the connecting portion 112, a load opposite to each other in the thickness direction is applied to the end on the clockwise side and the end on the counterclockwise side to form a twisted shape. Thereby, the 2nd connection part 112 is the shape inclined with respect to the 1st connection part 111 seeing from the longitudinal direction (namely, direction which connects the outer peripheral side terminal 101a and the inner peripheral side terminal 101b) of the connection part 101c. I am doing. In addition, the 1st connection part 111 is integrally formed with the outer peripheral side terminal 101a and the inner peripheral side terminal 101b which the said 1st connection part 111 connects, and it is one sheet with the said outer peripheral side terminal 101a and the inner peripheral side terminal 101b. This constitutes a flat plate. Even in this case, as shown in FIG. 14B, the end surfaces 101d and 101e in the width direction adjacent to each other in the circumferential direction of the connecting portions 101c adjacent in the circumferential direction are connected to each other in the axial direction of the short-circuit member 102 (the commutator 21). Can be separated in the same axial direction). In the example shown in FIGS. 14 (a) and 14 (b), every other connecting portion 101c is inclined, but two first connecting portions 111 are provided every two connecting portions 101c. The connecting portion 101c may be inclined to form the second connecting portion 112. Furthermore, if at least one connecting portion 101c is inclined as in the first embodiment, the inclined connecting portion 101c and the connecting portion 101c adjacent to the connecting portion 101c in the circumferential direction are as follows. The same operations and effects as (1) of the first embodiment can be obtained.

  Moreover, also in the short circuit member 71 of 2nd Embodiment, it is not necessary to incline all the connection parts 72c. However, like the short-circuit member 71, the short-circuit member having a configuration in which the cut portion 84 is formed in the conductive plate member to form the connection portion 72 c is configured so that the non-inclined connection portion is not continuously provided in the circumferential direction. .

  If it carries out as mentioned above, not all the connection parts 101c will be inclined with respect to the outer peripheral side terminal 101a. Therefore, for example, when the connecting portions 101c are inclined one by one, the number of operations for inclining the connecting portions 101c can be reduced compared to the case where all the connecting portions are inclined. In addition, when the connecting portions 101c are inclined one by one using the mold, all the connecting portions are inclined by inclining only the second connecting portions 112 except for the first connecting portions 111. The number of short-circuit members that can be manufactured with the same mold is increased as compared with the case of making them. That is, the life of the mold is increased with respect to the number of short-circuit members to be manufactured.

  -In the said 2nd Embodiment, as for the connection part 72c, the load which becomes mutually opposite in the plate | board thickness direction at the edge part of the clockwise direction and the edge part of the counterclockwise direction in the edge part of the width direction of this connection part 72c. In addition, it is formed in a twisted shape. However, for example, as illustrated in FIG. 10B, when viewed from the longitudinal direction of the connecting portion 72 c, adjacent connecting portions 72 c may be curved so that openings are alternately formed in different directions. More specifically, the connecting portion 72c shown in FIG. 10 (b) has a circular cross-sectional shape cut along the width direction, and the openings in the cross-section are alternately above the adjacent connecting portions 72c. It is formed so as to face downward (the vertical direction in FIG. 10 and the same as the axial direction of the commutator 21). Even in this case, the end surfaces 72d and 72e adjacent to each other in the circumferential direction of the connecting portions 72c adjacent to each other in the circumferential direction can be separated in the axial direction of the short-circuit member 71 (same as the axial direction of the commutator 21). In addition, the connecting portions 72c adjacent to each other in the circumferential direction are connected so that the end faces 72d and 72e in the width direction adjacent to each other in the circumferential direction of the connecting portions 72c adjacent in the circumferential direction are opposite to each other. They may be formed so as to be bent in opposite directions as viewed from the longitudinal direction (the cross-sectional shape in the width direction is V-shaped, C-shaped, etc.). In this case, the connecting portions 72c adjacent in the circumferential direction are curved or bent in directions opposite to each other when viewed from the longitudinal direction of the connecting portion 72c, so that they are adjacent in the circumferential direction with a small amount of bending or bending. The end faces 72d and 72e in the width direction adjacent to each other in the circumferential direction of the connecting portions 72c that meet each other can be separated in the axial direction of the short-circuit member 71. Moreover, you may form in such a shape also about the 1st connection part 31c and the 2nd connection part 32c of the said 1st Embodiment.

  -Although the manufacturing method of the short circuit member of the said 2nd Embodiment is equipped with the hole formation process, you may abbreviate | omit a hole formation process. In this case, the cut portion 84 is formed in the conductive plate 81 without forming the outer peripheral side through hole 82 and the inner peripheral side through hole 83.

  -In the said 1st Embodiment, after laminating | stacking the two electroconductive board | plate materials 51 in the lamination | stacking process, the site | part used as the 1st outer peripheral side terminal 31a between the outer peripheral side separation parts 52a, and the site | part used as the 2nd outer peripheral side terminal 32a The portions that become the first inner peripheral side terminal 31b and the portions that become the second outer peripheral side terminal 32a between the inner peripheral side separation portions 52b are joined together by welding. Moreover, in the said 2nd Embodiment, after laminating | stacking the two short circuit component group 72 in a lamination process, the laminated | stacked outer peripheral side terminals 72a and laminated | stacked inner peripheral side terminals 72b are joined by welding, respectively. To do. However, in the formed short-circuit members 24 and 71, the electrical connection between the laminated first and second outer peripheral terminals 31a and 32a and the outer peripheral terminals 72a, and the laminated first and second inner circumferences. As long as electrical connection between the side terminals 31b and 32b and between the inner peripheral terminals 72b is ensured, these terminals may be connected by a method other than welding. For example, the stacked terminals may be electrically connected by contact or may be electrically connected by caulking.

-In the said 2nd Embodiment, after performing a connection part deformation | transformation process, after performing a terminal formation process, you may perform a connection part deformation | transformation process after performing a terminal formation process.
-In the connection part deformation | transformation process of the said 1st Embodiment, the 1st and 2nd connection parts 31c and 32c are pressurized with a metal mold | die, and the 1st connection parts 31c and the 2nd connection parts 32c which adjoin the circumferential direction are mutually. When the end surfaces 31d and 31e adjacent to each other in the circumferential direction and the end surfaces 32d and 32e are deformed so as to be separated from each other in the axial direction of the short-circuit member 24, the first and second connecting portions 31c and 32c are simultaneously connected to the conductive plate 51. In order to obtain a curved shape that slightly protrudes in the plate thickness direction, pressure is applied with the same mold. Moreover, in the connection part deformation | transformation process of 2nd Embodiment, the connection part 72c is pressurized with a metal mold | die, and the end surfaces 72d and 72e adjacent to the circumferential direction of the connection part 72c adjacent to the circumferential direction are the axis | shafts of the short circuit member 71. At the same time, the connecting portion 72c is pressurized with the same mold so as to have a curved shape that slightly protrudes in the plate thickness direction of the outer peripheral side terminal 72a and the inner peripheral side terminal 72b. However, in the connection part deformation | transformation process of each embodiment, the process of making it deform | transform so that the end surfaces adjacent to the circumferential direction of the connection parts 31c, 32c, 72c adjacent to the circumferential direction may be spaced apart in the axial direction of the short circuit members 24 and 71. The step of bending the connecting portions 31c, 32c, and 72c may be performed separately.

  In the connecting portion deformation process of each of the above embodiments, the connecting portions 31c, 32c, and 72c are pressed by a mold (not shown) from both sides in the plate thickness direction, and the connecting portions 31c and 32c that are adjacent in the circumferential direction. 72c, the end faces 31d, 31e, 32d, 32e, 72d, 72e adjacent to each other in the circumferential direction are separated from each other in the axial direction of the short-circuit members 24, 71. However, by hooking a jig to one end side in the width direction of each connecting portion 31c, 32c, 72c, and deforming the connecting portions 31c, 32c, 72c by the jig, each adjacent to each other in the circumferential direction. The end surfaces 31d, 31e, 32d, 32e, 72d, and 72e in the width direction adjacent to each other in the circumferential direction of the coupling portions 31c, 32c, and 72c may be separated from each other in the axial direction of the short-circuit members 24 and 71, respectively.

  In the second embodiment, the insulating resin material is not filled between the connecting portions 72c adjacent in the circumferential direction. However, after the lamination process is completed, an insulating resin material may be filled between the connecting portions 72c adjacent in the circumferential direction to form an insulating portion similar to the insulating portion 33 of the first embodiment.

  In each of the above embodiments, the connection claw 23a is provided on the segment 23, and the ends of the coils 15a to 15h are connected to the segment 23 via the connection claw 23a. However, the structure which the edge part of each coil 15a-15h is directly connected to the outer peripheral side terminal 31a, 32a, 72a may be sufficient.

  In each of the above embodiments, the first and second coupling portions 31c and 32c or the coupling portions 72c facing each other in the stacking direction are prevented from coming into contact with each other and being short-circuited. Are curved so that the connecting portions 31c, 32c, 72c facing each other in the axial direction of the short-circuit members 24, 71 are away from each other. However, the method of preventing the 1st and 2nd connection parts 31c and 32c or the connection parts 72c which oppose in the lamination direction from contacting and short-circuiting is not restricted to this. For example, insulating paper having an insulating property may be interposed between the first and second connecting portions 31c and 32c and the connecting portion 72c facing each other in the stacking direction. In addition to bending the connecting portions 31c, 32c, 72c facing each other in the axial direction of the short-circuit members 24, 71 so as to be away from each other, the shape of each connecting portion 31c, 32c, 72c is changed to face the stacking direction. The first and second connecting portions 31c, 32c or the connecting portions 72c may be prevented from coming into contact with each other and being short-circuited.

  The short circuit member 24 of the first embodiment is formed by stacking two short circuit component groups (that is, the first short circuit component group 31 and the second short circuit component group 32). Similarly, the short-circuit member 71 of the second embodiment is formed by stacking two short-circuit constituent member groups 72. However, the number of short-circuit component members constituting the short-circuit members 24 and 71 is not limited to two as long as the segments 23 arranged with an interval of 120 ° can be short-circuited. For example, three or more may be sufficient. When the short-circuit member is composed of one short-circuit component member group, each connecting portion connects each outer peripheral side terminal and the inner peripheral side terminal located at a position shifted by 120 ° in the circumferential direction from each outer peripheral side terminal. Formed. Thus, if a short circuit member is comprised from one short circuit component group, a number of parts can be reduced.

  In the first embodiment, the first outer peripheral terminal 31a and the first inner peripheral terminal 31b, and the second outer peripheral terminal 32a and the second inner peripheral terminal 32b are on both sides of the short-circuit member 24 in the axial direction. End faces are in the same plane. Similarly, in the said 2nd Embodiment, the outer peripheral side terminal 72a and the inner peripheral side terminal 72b have the end surface of the both sides of the axial direction of the short circuit member 71 in the same plane. However, the first outer peripheral terminal 31a and the first inner peripheral terminal 31b, the second outer peripheral terminal 32a and the second inner peripheral terminal 32b, and the outer peripheral terminal 72a and the inner peripheral terminal 72b are short-circuit members. The end surfaces on both sides in the axial direction of 24 and 71 may not be in the same plane. For example, the outer peripheral terminals 31a, 32a, 72a may be arranged at positions shifted in the axial direction of the commutator 21 with respect to the inner peripheral terminals 31b, 32b, 72b. For example, each 1st outer peripheral side terminal 31a may be arrange | positioned so that it may incline with respect to the surface orthogonal to the axial direction of the commutator 21. FIG.

  In each of the above embodiments, each terminal 31a, 31b, 32a, 32b, 72a, 72b has a flat plate shape, but may have another shape (for example, a rectangular parallelepiped shape, a truncated cone shape, etc.).

  The DC motor 1 of each of the above embodiments has six magnetic poles, eight coils 15a to 15h, and twenty-four segments 23. However, the number of magnetic poles of the magnet 5, the number of coils 15 a to 15 h, and the number of segments 23 provided in the DC motor 1 may be smaller or larger. For example, the present invention may be applied to a DC motor having 16 segments 23. In this case, the segments 23 arranged at intervals of 180 ° are short-circuited by the short-circuit member.

The radial direction sectional view of a motor. The axial sectional view of a motor. The axial direction sectional view of a commutator. (A)-(d) is a side view of a connection part. (A) is a top view of the short circuit member of 1st Embodiment, (b) is sectional drawing of the short circuit member of 1st Embodiment (AA sectional drawing in Fig.5 (a)). FIG. Explanatory drawing for demonstrating the manufacturing process of the short circuit member of 1st Embodiment. Explanatory drawing for demonstrating the manufacturing process of the short circuit member of 1st Embodiment. Explanatory drawing for demonstrating the manufacturing process of the short circuit member of 1st Embodiment. (A) The end view which cut the connection part in the short circuit member of 2nd Embodiment along the width direction, (b) The end view which cut the connection part in the short circuit member of another form along the width direction. The top view of the short circuit member composition group of a 2nd embodiment. Explanatory drawing for demonstrating the manufacturing process of the short circuit member of 2nd Embodiment. Explanatory drawing for demonstrating the manufacturing process of the short circuit member of 2nd Embodiment. (A) is a top view of the short-circuit component member group of another form, (b) is sectional drawing of the short-circuit member of another form.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... DC motor, 2 ... Stator, 3 ... Armature, 5 ... Magnet, 11 ... Rotary shaft, 13 ... Armature core as a core, 13a-13h ... Teeth, 15a-15h ... Coil, 21 ... Commutator, 23 ... Segment, 24, 71, 102 ... Short-circuit member, 31 ... First short-circuit component member group as a short-circuit component member group, 31a ... First outer peripheral side terminal as an outer peripheral side terminal, 31b ... First as an inner peripheral side terminal 1 inner periphery side terminal, 31c ... 1st connection part as a connection part, 31d, 31e, 32d, 32e, 72d, 72e, 101d, 101e ... end face, 32 ... 2nd short circuit component group as a short circuit component group, 32a: a second outer peripheral terminal as an outer peripheral terminal, 32b: a second inner peripheral terminal as an inner peripheral terminal, 32c: a second connecting part as a connecting part, 51, 81 ... conductive plate material, 52 ... slit , 72,1 DESCRIPTION OF SYMBOLS 1 ... Short-circuit component member group, 72a, 101a ... Outer peripheral side terminal, 72b, 101b ... Inner peripheral side terminal, 72c, 101c ... Connection part, 82 ... Outer peripheral side through hole, 83 ... Inner peripheral side through hole, 111 ... First 112, the second connecting part.

Claims (10)

A plurality of outer peripheral terminals arranged in the circumferential direction, inner peripheral terminals arranged in the same number as the outer peripheral terminals in the circumferential direction inside the outer peripheral terminal, and the same number of outer peripheral terminals provided as the outer peripheral terminals, A short-circuit member comprising a short-circuit component group having a connecting portion that connects the inner peripheral terminal with a predetermined angle shift in the circumferential direction,
The connecting part adjacent in at least one pair of circumferential directions is such that the end faces in the width direction adjacent to each other in the circumferential direction of the connecting parts are spaced apart in the axial direction of the short-circuiting member. A plurality of outer peripheral terminals arranged in the circumferential direction, inner peripheral terminals arranged in the same number as the outer peripheral terminals in the circumferential direction inside the outer peripheral terminal, and the same number of outer peripheral terminals provided as the outer peripheral terminals, A connecting portion that connects the inner peripheral terminal with a predetermined angle shift in the circumferential direction, and a short-circuit constituting member group in which the outer peripheral terminal and the inner peripheral terminal are arranged in the same plane. A short-circuit member provided,
At least one of the two connecting portions forming a pair so that end faces in the width direction adjacent to each other in the circumferential direction of the connecting portions adjacent in the circumferential direction are separated from each other in the axial direction of the short-circuit member. The short-circuit member, wherein the connecting portion has a portion inclined with respect to the outer peripheral side terminal as viewed from the longitudinal direction of the connecting portion. In the short circuit member according to claim 1 or 2,
All the connecting portions are formed in the same shape so that end faces in the width direction adjacent to each other in the circumferential direction between the connecting portions adjacent in the circumferential direction are separated in the axial direction of the short-circuit member. A short-circuit member. In the short circuit member according to claim 1 or 2,
The plurality of connection portions are first connection portions and second connection portions that are alternately arranged in the circumferential direction, and each of the second connection portions is the first connection portion as viewed from the longitudinal direction of the connection portions. The short-circuit member characterized by making the shape inclined with respect to the connection part. In the short circuit member according to claim 1 or 2,
At least a pair of circumferentially adjacent connecting portions bend in the opposite directions as viewed from the longitudinal direction of the connecting portions so that the end faces in the width direction adjacent to each other in the circumferential direction are opposite to each other. Or the short circuit member characterized by making the shape bent. A plurality of segments arranged in the circumferential direction;
The commutator comprising the short-circuit member according to any one of claims 1 to 5, wherein the outer peripheral terminal is connected to the segment and short-circuits the segments having the same potential. . A stator with a magnet having six magnetic poles;
A rotating shaft, a core having eight teeth fixed to the rotating shaft and extending radially, eight coils wound around the teeth, and the rotating shaft An armature comprising a commutator according to claim 6 fixed to
A direct current motor characterized by comprising: A plurality of outer peripheral terminals arranged in the circumferential direction, inner peripheral terminals arranged in the same number as the outer peripheral terminals in the circumferential direction inside the outer peripheral terminal, and the same number of outer peripheral terminals provided as the outer peripheral terminals, It is a manufacturing method of a short-circuit member provided with a short-circuit component member group having a connecting portion that connects the inner peripheral side terminal with a predetermined angle shifted in the circumferential direction, respectively.
A cutting step of forming the connecting portion arranged in the circumferential direction by making a cut through the conductive plate material in the thickness direction of the conductive plate material,
The connecting portions are arranged in the thickness direction of the conductive plate such that at least one pair of circumferentially adjacent end surfaces of the connecting portions in the circumferential direction are separated from each other in the axial direction of the short-circuit member. The manufacturing method of the short circuit member characterized by including the connection part deformation | transformation process pressurized from both sides. In the manufacturing method of the short circuiting member according to claim 8,
Before performing the cutting step, the plurality of outer peripheral side through holes provided in the circumferential direction, and the inner peripheral side through holes provided in the circumferential direction by the same number as the outer peripheral side through holes inside the outer peripheral side through hole are electrically conductive. Perform the hole forming process to form in the conductive plate material,
In the cutting step, the conductive plate material is cut to the inner peripheral side through hole provided at a position shifted from the outer peripheral side through hole by a predetermined angle in the circumferential direction to form the connecting portion,
The conductive plate member between the outer peripheral side through holes is cut to form the outer peripheral side terminal, and the conductive plate member between the inner peripheral side through holes adjacent in the circumferential direction is cut to form the inner peripheral side terminal. The manufacturing method of the short circuit member characterized by including the terminal formation process which forms. A plurality of outer peripheral terminals arranged in the circumferential direction, inner peripheral terminals arranged in the same number as the outer peripheral terminals in the circumferential direction inside the outer peripheral terminal, and the same number of outer peripheral terminals provided as the outer peripheral terminals, It is a manufacturing method of a short-circuit member provided with a short-circuit component member group having a connecting portion that connects the inner peripheral side terminal with a predetermined angle shifted in the circumferential direction, respectively.
A punching step of punching the conductive plate material to form the connecting portions arranged in the circumferential direction by forming a plurality of slits arranged in the circumferential direction in the conductive plate material;
The connecting portions are arranged in the thickness direction of the conductive plate such that at least one pair of circumferentially adjacent end surfaces of the connecting portions in the circumferential direction are separated from each other in the axial direction of the short-circuit member. The manufacturing method of the short circuit member characterized by including the connection part deformation | transformation process pressurized from both sides.

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