JP3777371B2 - Armature manufacturing method - Google Patents

Description

  The present invention insulates a plurality of coil conductors having a pair of straight portions extending in parallel and linearly and a first coil end connecting one end of both straight portions to a plurality of slots provided on the outer periphery of the armature core. After inserting through paper and twisting the part which protruded from the other end of the armature core of both straight parts in the circumferential direction of the armature core to form the second and third coil ends, The present invention relates to an improvement in an armature manufacturing method in which a connecting end portion connected to second and third coil ends is housed and electrically connected to a housing groove of a riser portion provided in a commutator facing the other end.

A manufacturing method for manufacturing an armature in this way is already known, for example, in Patent Document 1.
JP-A-6-14196

  However, in the above-described conventional manufacturing method, the electric conductor is twisted by applying a pressing force along the circumferential direction of the armature core to the protruding portion from the other end of the armature core among the two straight portions included in the coil conductor. Since the second and third coil ends arranged on the other end side of the child core are formed, in the twisting process, stress along the axial direction of the armature core acts on each coil conductor, and each coil conductor May move in the axial direction of the armature core. For this reason, the length of the coil side that remains as a straight portion of both straight portions changes, and the end portion of the insulating paper may be sandwiched between the coil conductor and the armature core and torn. In this armature, an insulating plate for avoiding direct contact between the coil conductor and the armature core is brought into contact with both ends of the armature core, which increases the number of parts. In addition, even if each coil conductor moves in the axial direction of the armature core in the twisting process, the length of the connection end is required to securely accommodate the connection end of each coil conductor in the accommodation groove provided in the riser part of the commutator. Since the length is set longer than necessary and the excess part is removed, an extra work is required in the manufacture of the armature.

  The present invention has been made in view of such circumstances, and eliminates the need to cut off an excess portion of the connecting end portion by post-processing, thereby improving the manufacturing efficiency and as a straight portion of the pair of straight portions. Manufacture of armature that reduces the number of parts by ensuring that the amount of protrusion of the remaining coil side from the armature core is accurately secured to a value that can secure a sufficient insulation distance, eliminating the need for an insulating plate It aims to provide a method.

  In order to achieve the above object, the invention according to claim 1 is the first coil end connecting between the first and second straight portions extending in parallel and linearly and one end of the first and second straight portions. A coil conductor forming step of forming a plurality of coil conductors; an armature core having a rotation axis coaxially; and a plurality of slots provided on an outer periphery of the armature core so that both ends protrude from both ends of the armature core. Insulating paper setting step for inserting each coil conductor; first and second linear shapes of each coil conductor in which the first coil end is disposed opposite to one end of the armature core in a pair of slots selected from the slots A coil conductor set in which a plurality of coil conductors are set in an armature core by inserting a portion through the insulating paper so that first and second straight portions of different coil conductors overlap each other in each slot Process and; Of the first and second straight portions of each coil conductor, the portion protruding from the other end of the armature core is used while leaving the other end portions of the first and second straight portions as connection end portions. A twisting step of twisting in the circumferential direction of the child core to form second and third coil ends; and a commutator having a riser portion provided with a plurality of receiving grooves facing the other end of the armature core to the rotating shaft The armature is manufactured by performing a fixing commutator mounting step; and a connecting step of receiving and connecting the two connecting end portions of the coil conductors in the receiving grooves of the riser portion. In the armature manufacturing method described above, in the coil conductor molding step, the length of the first coil end and the portion of the armature core that remains as a straight coil side of the first and second straight portions. Length considering the amount of protrusion from both ends And the total length of the lengths of the second and third coil ends and the necessary and sufficient lengths of the two connection ends, and forming the coil conductors from the conductors whose surfaces are insulated and coated. The insulation coating of the connection end is peeled off, and in the twisting step, the twist angle and the axial direction set in advance corresponding to the circumferential direction and the axial position of the armature core in the final shape of the second and third coil ends The displacement driving is performed while holding the connection end so as to be a moving distance.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, in the twisting step, a protruding portion from the other end of the armature core is twisted in the first and second straight portions. In this case, a plurality of support members that serve as fulcrums are brought into contact with the first and second straight portions.

  Furthermore, in addition to the configuration of the invention described in claim 1, the invention according to claim 3, in addition to the configuration of the invention according to claim 1, from one end of the armature core in the insulating paper inserted into each slot after the insulating paper setting step is completed. The projecting portion is expanded.

  According to the first aspect of the present invention, in the twisting process, the twist angle and the axial movement set in advance corresponding to the circumferential direction and the axial position of the armature core in the final shapes of the second and third coil ends are provided. Since the connecting end is driven to be displaced so as to be a distance, it is avoided that stress in the direction along the axis of the armature core acts on the coil conductor, and each coil conductor moves in the axial direction of the armature core. The second and third coil ends can be formed by twisting a portion protruding from the other end of the armature core in the pair of straight portions included in each coil conductor in the circumferential direction of the armature core. it can. Therefore, in the coil conductor forming step, the length of the first coil end, the length in consideration of the protruding amount from both ends of the armature core of the coil side that remains as the straight portion of the two straight portions, and the second and third coil ends Even if the coil conductor is molded with the total length of the length and the necessary and sufficient length of both connection ends as the overall length, the connection end from which the insulating film has been peeled off should not cause any extra parts. It can be reliably accommodated in the accommodation groove provided in the riser part of the commutator, and the manufacturing efficiency can be improved by omitting the work of cutting off the excess part. In addition, it is possible to accurately secure the amount of protrusion from the armature core of the portion of the straight part of the coil conductor that remains as the coil side to a value that can secure a sufficient insulation distance. The number of parts can be reduced by eliminating the need for a plate.

  According to the second aspect of the present invention, when the second and third coil ends are formed by twisting a portion of the pair of straight portions protruding from the other end of the armature core in the twisting step, Without using the edge of the slot on the other end side of the child core as a fulcrum, twist the projecting part from the other end of the armature core in both straight parts, so that the insulation paper from both ends of the armature core It is possible to prevent the protrusion from being damaged by being sandwiched between the two straight portions and the edge of the slot.

  Furthermore, according to the invention of claim 3, in the coil conductor setting step, it is possible to improve the insertion efficiency into the slot through the insulating paper of the two straight portions of the coil conductor, and to improve the insertion efficiency. It is possible to prevent the insulating paper from being displaced in the axial direction of the armature core by inserting the straight portions.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  FIGS. 1 to 21 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of an engine starting device, and FIG. 2 is a diagram sequentially showing processing steps of a coil conductor forming process and a coil conductor setting process. 3 is a perspective view showing a preformed conductor, FIG. 4 is a longitudinal sectional view of the cutting device, taken along line 4-4 in FIG. 5, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, and FIG. FIG. 7 is a view taken along the arrow 7 in FIG. 6, FIG. 8 is a longitudinal sectional view of an essential part of a twist forming apparatus for twisting a preformed conductor to form a coil conductor, and FIG. FIG. 10 is a diagram showing the process of forming and inserting insulating paper, FIG. 11 is a cross-sectional view showing a first-stage driving state of insulating paper, and FIG. 12 is a cross-sectional view showing a second-stage driving state of insulating paper. FIG. 13 is a side view of the armature core in a state where insulating paper is set, and FIG. 14 shows a coil conductor set on the armature core. FIG. 15 is a longitudinal sectional view of a twisting device for twisting a coil conductor to form second and third coil ends, and FIG. 16 is a sectional view taken along line 16-16 in FIG. Is a diagram showing the relationship between the twist angle and the axial movement distance, FIG. 18 is a front view of the armature core as seen from the second and third coil end sides, FIG. 19 is a view taken along line 19-19 in FIG. 20 is a perspective view showing the coil conductor in a state where the second and third coil ends are formed, and FIG. 21 is a longitudinal side view showing a state in which the connection end of the coil conductor is electrically connected to the commutator.

  First, in FIG. 1, the rotating shaft 16 of the starting motor 15 is connected to a pinion drive shaft 18 via a gear reduction mechanism 17. The pinion drive shaft 18 is connected to the clutch outer 19a of the overrunning clutch 19 while allowing relative movement in the axial direction, and is fixedly connected to the clutch inner 19b of the overrunning clutch 19 coaxially with the pinion drive shaft 18. A pinion 22 that can be meshed with a starting ring gear 21 for starting the engine is fixed to the sleeve 20.

  An electromagnetic drive unit 23 that moves the overrunning clutch 19 and the sleeve 20 in the axial direction relative to the pinion drive shaft 18 is disposed on the side adjacent to the starter motor 15. The electromagnetic drive unit 23 includes a movable core 24 and a coil 25 that exerts an electromagnetic force that operates the movable core 24. The electromagnetic force that acts on the movable core 24 when the coil 25 is excited causes the movable core 24 to move. The core 24 moves against the spring force of the spring 26 to the position indicated by the chain line in FIG.

  One end of a shift lever 27 is connected to the front end of a shaft portion 24 a that is integrally connected to the movable core 24. The other end of the shift lever 27 is engaged with the clutch outer 19a of the overrunning clutch 19 so as to straddle it. Accordingly, when the overrunning clutch 19 and the sleeve 20 are driven in the axial direction by the electromagnetic drive unit 23, the pinion 22 is in the retracted position where the meshing with the starting ring gear 21 is released (position indicated by the solid line in FIG. 1). And a forward movement position (position indicated by a chain line in FIG. 1) meshing with the starting ring gear 21.

  The casing 30 of the starter motor 15 is formed by sandwiching a cylindrical yoke 31 between a front bracket 32 and a rear bracket 33, and the brackets 32 and 33 are fastened to each other by a plurality of through bolts 34. A stator 35 is fixed to the inner surface of the yoke 32, and the rotating shaft 16 provided in the armature 36 coaxially surrounded by the stator 35 is rotatably supported by the front bracket 32 and the rear bracket 33.

  The armature 36 is fixed to an armature core 40 having the rotating shaft 16 coaxially, a plurality of coil conductors 70 attached to the armature core 40, and a portion of the rotating shaft 16 on the rear bracket 33 side. And a commutator 37 to which the coil conductors 70 are connected.

  The commutator 37 is provided at a portion of the rotating shaft 16 on the rear bracket 33 side, and elastically moves in a direction in which the commutator 37 slides on a plurality of brush holders 38 fixedly supported on the inner surface of the rear bracket 33. The brushes 39 to be energized are respectively held.

  By the way, in manufacturing the armature 36, a coil conductor forming process, an insulating paper setting process, a coil conductor setting process, a twisting process, a commutator mounting process, and a connection process are executed. The process will be described in detail.

  In the coil conductor forming step, as shown in FIG. 2, the conductor 43 from the reel 44 on which the conductor 43 formed by insulating coating the surface of the copper wire having a relatively large diameter is wound, and the wire 43 is stripped and stripped. The wire feeding means 45 supplies the bending means 46 with the process. By being bent in the U-shape by the bending means 46 and then cutting in the cutting process, as shown in FIG. 3, linear first and second leg portions 47a and 47b extending in parallel with each other are provided. A preformed conductor 47 bent into a U-shape can be obtained, and the preformed conductor 47 is formed to have a length sufficient to obtain the coil conductor 70 having the final shape.

  Thus, the end portions of both leg portions 47a and 47b of the preformed conductor 47 function as connecting end portions 74 and 75 having a certain length when formed as the coil conductor 70. The insulating coatings on both connection ends 74 and 75 are peeled off.

  4 and 5, the cutting device 48 used in the cutting process of the coil conductor forming process includes a fixed base 50 having a guide groove 49 on the upper surface for guiding the feeding of the conductor 43, and an upper end upward from the guide groove 49. A pair of cutters 51 and 51 that are attached to the fixed base 50 so as to be able to move up and down in a limited range while being elastically biased in the protruding direction, and the conductor 43 in cooperation with the cutters 51 and 51. And a punch 52 disposed so as to be movable up and down at a position above the fixing base 50 to be cut, and a discharge port 53 located at an intermediate portion of the guide groove 49 and opening downward is fixed between the cutters 51 and 51. Formed on the base 50.

  The cutter 51 is provided with a blade portion 54 formed at the upper end corresponding to the substantially lower half portion of the conductor 43 at the upper end, and the blade portion 54 is different from the discharge port 53. The upper end of the inclined surface 54a disposed on the opposite side and the upper end of the vertical flat surface 54b disposed on the discharge port 53 side are continuously provided so as to form an acute angle, and the guide groove 49 in the fixed base 50 is formed. It is attached to the fixed base 50 so that the upper surface of the blade portion 54 protrudes from the bottom surface.

  On the other hand, the punch 52 is formed in a substantially V-shape opened downward to cut the conductor 43 together with the blade portions 54 of the both cutters 51, 51, and the flat surface 54b of the both blade portions 52. It can be inserted into the discharge port 53 while sliding, and is arranged to be movable up and down at a position corresponding to the discharge port 37 and above the fixed base 50.

According to such a cutting device 48 , as shown in FIGS. 6 and 7, the cut end face of the preformed conductor 47 obtained by cutting the U-shaped conductor 43, that is, the first and second legs. The end surfaces of the portions 47a and 47b are an inclined surface 47c on the outer periphery of the lower half portion when the blade portion 54 of the cutter 51 bites into the conductor 43, and an inclined surface 47d on the outer periphery of the upper half portion when the punch 52 bites into the conductor 43. And a flat surface 47e formed by cutting with the blade portion 54 of the cutter 51 and the punch 52 along the flat surface 54b of the blade portion 54.

That is, by cutting with the cutting device 48 , it is possible to obtain a right-angled cut end face that does not generate flash while avoiding the elongation of the conductor 43 during cutting, and the preformed conductor 47 with excellent dimensional accuracy. Can be obtained.

  In FIG. 2 again, after the preformed conductor 47 is obtained, the same number of the preformed conductors 47 as the plurality of coil conductors 70 to be attached to the armature core 40 are transferred to the holder of the transfer device 58. 59 detachably holds. The transfer device 58 is capable of moving the holder 59 between the first and second stations S1 and S2 that are separated from each other. In the first station S1, the bent portion is in the posture of the upper end position. Bringing each of the preformed conductors 47 to the second station S2 by moving the holder 59 holding the bent portions of the plurality of preformed conductors 47 to the second station S2 from the first station S1. Can do.

  Each preformed conductor 47... Held by the holding tool 59 is transferred to the twist forming device 60 located below the holding tool 59 in the second station S2, and the second station S2 holds the holding conductor. A pusher 61 for pushing and setting the preformed conductors 47... Which has been released to the lower twisting device 60 side after releasing the holding state of the tool 59 to the twisting device 60 side is disposed so as to be movable up and down. .

  Moreover, the twist forming device 60 can reciprocate between the second station S2 and the third station S3 spaced from the second station S2.

  In FIG. 8, the twist forming device 60 includes a fixed holding member 62 having a vertical axis, and a movable holding member 63 fitted into the fixed holding member 62 so as to be rotatable around the vertical axis, and fixedly held. A plurality of insertion grooves 64 in which the first leg portions 47a of the plurality of preformed conductors 47 can be inserted from above are provided on the inner periphery of the member 62 so as to extend in the axial direction. A plurality of insertion grooves 65 extending in the axial direction so that the second leg portions 47b of the plurality of preformed conductors 47 can be inserted from above can individually correspond to the insertion grooves 64, respectively. Provided. Thus, the number of the insertion grooves 64... 65 corresponds to the number of slots 40 a (see FIG. 13 described later) provided on the outer periphery of the armature core 40, for example, 23 insertion grooves 64. 65... Are provided on the fixed holding member 62 and the movable holding member 63 at equal intervals in the circumferential direction.

  In each of the insertion grooves 64, 65, support rods 66, 67, which support the first and second leg portions 47a, 47b of the preformed conductor 47 from below are inserted from below. The preformed conductors 47 are arranged so that the first and second leg portions 47a, 47b, etc. are brought into contact with and supported by the support rods 66, 67 from above so as to surround the fixed holding member 62 and the movable holding member 63. The insertion grooves 64, 65,... Located at positions corresponding to each other in the direction are inserted from above.

  Referring to FIG. 2, the plurality of preformed conductors 47 are received in the second station S2 by being pushed into the insertion grooves 64, 65, etc. by the pushing tool 61 from the holder 59 of the transfer device 58. The twist forming apparatus 60 moves from the second station S2 to the third station S3.

  A chuck device 76 that can be moved up and down is arranged above the twist forming device 60 in the third station S3, and the chuck device 76 detachably holds each of the coil conductors 70. And a pressing tool 78 that can press the coil conductors 70 held by the holding means 77 downward. The pressing tool 78 can be moved up and down with respect to the holding tool 77. Relative movement is possible.

  When the twist forming device 60 moves to the third station S3 in a state where the plurality of preformed conductors 47 are set, the upper ends of the plurality of preformed conductors 47 set in the twist forming device 60 are brought into contact with each other. Then, the pressing tool 78 is lowered. In addition, the pressing tool 78 can rotate about the same axis as the fixed holding member 62 and the movable holding member 63.

  Thus, in the third station S3, the movable holding member 63 of the twist forming device 60 is rotated by a predetermined rotation angle, for example, an angle corresponding to six slots 40a provided in the armature core 40. As a result, the preformed conductors 47 are twisted, and coil conductors 70 as shown in FIG. 9 are obtained. That is, a plurality of coils each having first and second straight portions 71 and 72 extending in parallel and linearly and a first coil end 73 connecting between one ends of the first and second straight portions 71 and 72. The conductors 70 can be formed.

  The plurality of coil conductors 70 obtained by the twist forming apparatus 60 are extracted from the twist forming apparatus 60 by the chuck device 76, and the twist forming apparatus 60 from which the plurality of coil conductors 70 are extracted is the first one. Return from the third station S3 to the second station S2.

  By the way, the insulating paper setting step is executed at a station separated from the first to third stations S1 to S3, and as shown in FIG. 10, the insulating paper 81 fed from the insulating paper roll 79 is It is cut so as to have a length slightly longer than the slots 40a of the armature core 40 with folds 80 extending in the longitudinal direction on both sides, and supplied to the insulating paper forming tool 82 side.

  Referring to FIGS. 11 and 12 together, the insulating paper forming tool 82 has a plurality of forming grooves 83 having a shape corresponding to the slot 40a of the armature core 40 at equal intervals on the outer periphery. Each of the forming grooves 83 is intermittently rotationally driven so as to be sequentially arranged at the location where the insulating paper 81 is supplied.

  Thus, as shown in FIG. 11, the insulating paper 81 is driven into the forming groove 83 from the outside in the circumferential direction of the insulating paper forming tool 82 by the first driving tool 84, and the first driving tool 84 is formed by molding. The opening 83a of the groove 83 is formed to have a narrow width so that it can be easily inserted into the opening 83a according to the narrowing corresponding to the slot 40a.

  After the first driving of the insulating paper 81 into the forming groove 83 by the first driving tool 84 is completed, the insulating paper molding tool 82 is driven to rotate by a predetermined angle, and as shown in FIG. Thus, the second punching tool 85 is opened to the molding groove 83 so that the insulating paper 81 has a shape closer to the molding groove 83. It is formed so that it can fit into the part 83a and can push both ends of the insulating paper 81 in the width direction. Since the folds 80 and 80 are formed in advance on both sides of the insulating paper 81 at the time of forming by the first and second step driving, the forming of the insulating paper 81 by the forming groove 83 is facilitated.

  After the second driving of the insulating paper 81 into the forming groove 83 by the second driving tool 85 is completed, the insulating paper forming tool 82 is further rotated by a predetermined angle, and the insulating paper 81 formed in the forming groove 83. Is pushed out of the forming groove 83 by the pusher 86.

  Thus, the armature core 40 is disposed at a position adjacent to the insulating paper forming tool 82 so that the armature core 40 can rotate around the same axis as the insulating paper forming tool 82, and the insulating paper 81 pushed out by the pusher 86 is provided. The armature core 40 is rotated so as to be sequentially inserted into the slots 40a.

In the insulating paper setting process, the armature core 40 in which the insulating paper 81... Is inserted in each slot 40a... Is brought to the fourth station S4 adjacent to the third station S3 as shown in FIG. the in fourth station S4, as shown in Figure 13, the projecting portion of the insulating paper 81 ... from one axial end of the armature core 40, by the press write Murrell heat expansion jig 86, each insulating paper 81 is formed with an expanded portion 81a at one end thereof.

  Thus, the armature core 40 in the state in which the insulating paper 81... Having the expanded portion 81a at one end is inserted into the slots 40a is brought from the fourth station S4 to the third station S3. By the action of the chuck device 76, the plurality of coil conductors 70 held in advance by the chuck device 76 are inserted into the slots 40a of the armature core 40 via the insulating paper 81.

  At this time, as shown in FIG. 14, each of the coil conductors 70... Has a pair of selected ones of the slots 40 a of the armature core 40 with the first coil end 73 facing one end of the armature core 40. The first and second straight portions 71, 72 are inserted into the slots 40a, 40a and are set in the armature core 40. In each slot 40a, the first coil conductors 70, 70 different from each other are set. The second straight portions 71 and 72 are inserted through the insulating paper 81 so as to overlap with each other.

  15 is used in the twisting process executed after the setting of the coil conductors 70 to the armature core 40 is completed, and the armature core 40 in a state where the coil conductors 70 are set is twisted. Set to 90.

  The twisting device 90 has a fixed base 91, a support base 92 fixedly disposed above the base 91, and a core fixed to the support base 92 with an insertion hole 93 into which the armature core 40 is inserted. The armature core 40 inserted into the insertion hole 93 is fixedly fixed by the core support member 94 by elastically contacting the support member 94 and a plurality of positions in the circumferential direction of the armature core 40 inserted into the insertion hole 93. The elastic holding means 95 provided at a plurality of locations in the circumferential direction of the insertion hole 93 and the other end of the rotary shaft 16 provided coaxially with the armature core 40 are fitted together so as to support the other armature core 40. A support cylinder 96 that is erected on the base 92 so that the end is in contact with the upper end, an upper elevator 97 that is disposed between the base 91 and the support 92, and between the upper elevator 97 and the base 91 A lower lifting platform 98 disposed on the rotary shaft, and the rotating shaft 6, an outer rotating cylinder 99 that is supported on the upper lifting platform 97 so as to be able to rotate around the same axis as 6, and an outer rotating cylinder 99 that is supported on the lower lifting platform 98 so as to be able to rotate around the same axis as the rotating shaft 16. An inner rotating cylinder 100 is provided in the rotating cylinder 99 so as to be relatively rotatable.

  A plurality of connection end portions 74 provided at the other ends of the first straight portions 71 of the plurality of coil conductors 70 set on the armature core 40 can be inserted into the inner periphery of the outer rotating cylinder 99 from above. Insertion grooves 101 are provided so as to extend in the axial direction, and on the outer periphery of the inner rotating cylinder 100, the second straight portions 72 of the plurality of coil conductors 70 are provided with connection ends 75 provided at the other ends. Are inserted from above, and a plurality of insertion grooves 102 extending in the axial direction are provided so as to individually correspond to the insertion grooves 101.

  The upper and lower lifting platforms 97 and 98 can be moved up and down in synchronization by the lifting drive means 103. The outer rotating cylinder 99 is rotationally driven by the rotational driving means 110. The rotational driving means 110 includes a rotational drive shaft 104 supported at both ends by a base 91 and a support base 92. The drive gear 105 supported by the upper lifting platform 97 while meshing with the rotary drive shaft 104 in an allowable manner and the outer drive cylinder 99 fixedly meshed with the drive gear 105. Driven gear 106, an arm 107 whose base is fixed to the lower end of the rotary drive shaft 104, a screw shaft 108 extending in a direction orthogonal to the rotary drive shaft 104, and a screw shaft 108 so as to prevent rotational operation. And a nut 109 to which the tip of the arm 107 is coupled, and a motor (not shown) that rotationally drives the screw shaft 108.

  The inner rotating cylinder 100 is driven to rotate by a rotation driving means 111 configured in the same manner as the rotation driving means 110 that rotates the outer rotating cylinder 99.

  Referring also to FIG. 16, the armature is between the first and second straight portions 71, 72 projecting from the slots 40 a of the armature core 40 supported by the core support member 94. The front ends of the support members 112 opposite to the other end of the core 40 are disposed so as to be able to advance and retreat, and the base end portions 112a of these support members 112 are rotatably supported by the support base 92. The rotating plate 113 is fitted in a plurality of fitting holes 114. The rotating plate 113 is driven to rotate by a cylinder 115 supported by a support base 92.

  Thus, the fitting holes 114 are formed in a long hole shape so as to be positioned on one side in the circumferential direction as they go outward in the radial direction of the rotating plate 113. Each of the supporting members 112 slidable in a direction along the direction has a state in which a tip portion is disposed between the first and second straight portions 71, 72, according to the rotation of the rotating plate 113, and The first and second straight portions 71, 72... Slide between the first and second straight portions 71, 72.

  In such a twisting device 90, the outer and inner rotations of the plurality of coil conductors 70... Set on the armature core 40 are inserted in the insertion grooves 101. The cylinders 99 and 100 are rotated in opposite directions while being raised.

  At this time, as shown by a thick solid line in FIG. 17, the connecting end portions 74..., 75... Are displaced and driven so as to have preset twist angles and axial movement distances. As shown in FIGS. 18 to 20, of the first and second straight portions 71, 72, etc. of the coil conductors 70, the portions protruding from the other end of the armature core 40 are the first and second portions thereof. The second and third coil ends 71b, 72b, ... are formed by twisting in the circumferential direction of the armature core 40 while leaving the other ends of the two straight parts 71, 72, ... as the connecting ends 74, 75, .... The coil sides 71a,..., 72a,... Remaining as straight portions of the first and second straight portions 71, 72,... Remain accommodated in the slots 40a.

  Thus, the relationship between the twist angle and the axial movement distance shown in FIG. 17 corresponds to the circumferential direction and the axial position of the armature core 40 in the final shape of the second and third coil ends 71b,. The curve indicated by the thick solid line in FIG. 17 corresponds to the straight portion disposed inside of the first and second straight portions 71 and 72, and the thin line in FIG. A curve indicated by a solid line corresponds to a straight portion arranged on the outside of the first and second straight portions 71 and 72.

  In addition, when the outer and inner rotary cylinders 99, 100 are raised while holding the connection ends 74, 75 ... of the coil conductors 70, the first and second straight lines are rotated. The support members 112 are arranged between the shape portions 71, 72, and the support members 112 are arranged from the other end of the armature core 40 of the first and second straight portions 71, 72,. It becomes a fulcrum when twisting the protruding part.

  In the next commutator mounting step, as shown in FIG. 21, a commutator 37 having a riser portion 37a provided with a plurality of receiving grooves 116 is fixed to the rotary shaft 16 so as to face the other end of the armature core 40 and connected. In the process, a pair of electrodes 117, 118 connected to the power source 119 are accommodated after the connection ends 74, 75... Is connected to the commutator piece of the commutator 37 and the connecting end portions 74 and 75 that overlap each other, thereby electrically connecting the connecting end portions 74 and 75 to the commutator 37.

  In this way, the armature 36 is manufactured. In the coil conductor forming step, the length of the first coil end 73 and the linear coil among the first and second straight portions 71 and 72 of the coil conductor 70 are manufactured. The length in consideration of the protruding amount from both ends of the armature core 40 of the portion remaining as the sides 71a, 72a, the lengths of the second and third coil ends 71b, 72b, and the necessary and sufficient length of both connection ends 74, 75 The coil conductor 70 is formed with the total length of

  Next, the operation of this embodiment will be described. In the twisting step, a twist angle set in advance corresponding to the circumferential direction and axial position of the armature core 40 in the final shape of the second and third coil ends 71b and 72b. Since the connecting end portions 74 and 75 are driven to be displaced so as to have an axial movement distance, it is possible to avoid the stress in the direction along the axis of the armature core 40 from acting on the coil conductor 70, and In order to prevent the armature core 40 from moving in the axial direction, a portion protruding from the other end of the armature core 40 of the pair of straight portions 71... The second and third coil ends 71b, 72b,... Can be formed by twisting in the circumferential direction of the armature core 40.

  Therefore, in the coil conductor forming step, the length of the first coil end 73 and the portion of the armature core 40 that remains as the straight coil sides 71a and 72a out of the first and second straight portions 71 and 72 of the coil conductor 70. The coil conductor 70 is formed with the total length of the length considering the amount of protrusion from both ends, the lengths of the second and third coil ends 71b and 72b, and the necessary and sufficient lengths of both connection ends 74 and 75 as the overall length. Even so, the connection end portions 74 and 75 from which the insulating film has been peeled can be reliably accommodated in the accommodation groove 116 provided in the riser portion 37a of the commutator 37 so that no excess portion is generated. It is possible to improve the manufacturing efficiency by omitting the work of excising the portion.

  Further, it is possible to accurately secure the amount of protrusion from the armature core 40 of the portions of the straight portions 71 and 72 of the coil conductor 70 remaining as the coil sides 71a and 72a to a value that can secure a sufficient insulation distance. In addition, it is possible to reduce the number of parts by eliminating the need for an insulating plate which has been conventionally required.

  Further, in the twisting process, the first and second straight portions 71, 72 are provided with a plurality of support members 112 serving as fulcrums when twisting the protruding portion from the other end of the armature core 40, to the first and second straight portions 71, 72. When the second and third coil ends 71b and 72b are formed by twisting the portion of the straight portions 71 and 72 that protrudes from the other end of the armature core 40. The armature core 40 is twisted so that the protruding portion from the other end of the armature core 40 is twisted out of the straight portions 71 and 72 without using the edge of the slot 40a on the other end side of the child core 40 as a fulcrum. It is possible to prevent the projecting portions of the insulating paper 81 from both ends of the two sheets from being sandwiched between the straight portions 71 and 72 and the edge of the slot 40a and being damaged.

  Further, after the insulating paper setting process is finished, the protrusions 80a from one end of the armature core 40 are expanded in the insulating paper 81 inserted in the slots 40a, so The insertability of the straight portions 71 and 72 into the slot 40a through the insulating paper 81 can be improved, and the insertion efficiency can be improved, and the insulating paper 81 is electrically driven by the insertion of the straight portions 71 and 72. It is possible to prevent the child core 40 from being displaced in the axial direction.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

It is a longitudinal cross-sectional view of an engine starting device. It is a figure which shows sequentially the process of a coil conductor shaping | molding process and a coil conductor setting process. It is a perspective view which shows a preforming conductor. It is a longitudinal cross-sectional view of a cutting device, and is 4-4 sectional view taken on the line of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a figure which shows the cut end surface of a conductor. FIG. 7 is a view taken in the direction of arrow 7 in FIG. 6. It is a principal part longitudinal cross-sectional view of the twist forming apparatus for twisting a preforming conductor and forming a coil conductor. It is a perspective view of a coil conductor. It is a figure which shows the shaping | molding and insertion process of insulating paper. It is a cross-sectional view showing a first stage driving state of insulating paper. It is a cross-sectional view showing a second stage driving state of the insulating paper. It is a side view of an armature core in the state where insulating paper was set. It is a perspective view which shows the state which set the coil conductor to the armature core. It is a longitudinal cross-sectional view of the twist apparatus for twisting a coil conductor and forming the 2nd and 3rd coil end. It is sectional drawing which follows the 16-16 line of FIG. It is a figure which shows the relationship between a twist angle and an axial direction movement distance. It is a front view of the armature core seen from the 2nd and 3rd coil end side. It is a 19-19 line arrow directional view of FIG. It is a perspective view which shows the coil conductor in the state in which the 2nd and 3rd coil end was formed. It is a vertical side view which shows the state which electrically connects the connection end part of a coil conductor to a commutator.

Explanation of symbols

16 ... Rotating shaft 36 ... Armature 37 ... Commutator 37a ... Riser part 40 ... Armature core 40a ... Slot 70 ... Coil conductor 71 ... First straight part 71a, 72a ... coil side 71b ... second coil end 72 ... second straight portion 72b ... third coil end 73 ... first coil end 74, 75 ... connection end 81 ... insulating paper 112 ... support member 116 ... receiving groove

Claims (3)

  It has the 1st and 2nd straight part (71, 72) extended in parallel and linearly, and the 1st coil end (73) which connects between the ends of the 1st and 2nd straight part (71, 72). A coil conductor forming step for forming a plurality of coil conductors (70); and a plurality of slots (40a) provided on the outer periphery of the armature core (40) provided coaxially with the rotating shaft (16) at both ends of the armature core (40). An insulating paper setting step of inserting insulating paper (81) so that both ends protrude from the arm; and a pair of slots (40a) selected from the slots (40a) to the armature core (40) The first and second straight portions (71, 72) of each coil conductor (70) having the first coil end (73) opposed to one end of the coil conductor are different from each other in each slot (40a). 70) first and second straight portions ( A coil conductor setting step of setting a plurality of coil conductors (70) on the armature core (40) by inserting them through the insulating paper (81) so as to overlap the inside and outside; Of the first and second straight portions (71, 72) of (70), the portions protruding from the other end of the armature core (40) are replaced with the first and second straight portions (71, 72). A twisting step in which the second and third coil ends (71b, 72b) are formed by twisting in the circumferential direction of the armature core (40) while leaving the other end of the arm as the connection end (74, 75); A commutator mounting step of fixing a commutator (37) having a riser portion (37a) provided with a groove (116) to the rotating shaft (16) so as to face the other end of the armature core (40); Each receiving groove (116) of (37a) An armature manufacturing method for manufacturing an armature by performing a connecting step of storing and electrically connecting two connection end portions (74, 75) of each coil conductor (70). In the coil conductor forming step, the length of the first coil end (73) and the remaining portions of the first and second straight portions (71, 72) as linear coil sides (71a, 72a). The length of the armature core (40) taking into account the amount of protrusion from both ends, the lengths of the second and third coil ends (71b, 72b), and the connection end portions (74, 75) are both necessary and sufficient. In the twisting step, the total length of the first and second lengths is defined as the total length, and the insulating coatings of the connection end portions (74, 75) are peeled off while forming the coil conductors (70) from the conductors whose surfaces are insulated. , Second and third coil ends (71b, 72b) The connection end portions (74, 75) are held so as to have a twist angle and an axial movement distance set in advance corresponding to the circumferential direction and the axial position of the armature core (40) in the final shape. A method for manufacturing an armature, wherein the displacement driving is performed.   In the twisting step, a plurality of support members (112) serving as fulcrums when twisting the protruding portion from the other end of the armature core (40) among the first and second straight portions (71, 72), The armature manufacturing method according to claim 1, wherein the first and second straight portions (71, 72) are brought into contact with each other.   The protruding portion from one end of the armature core (40) of the insulating paper (81) inserted into each slot (40a) is expanded after the insulating paper setting step is completed. Item 2. A method for manufacturing an armature according to Item 1.