JP5229929B2 - Wedge inserter and coil inserter - Google Patents

Description

  The present invention relates to a wedge insertion machine that inserts a pre-wound coil bundle into a slot of a stator core at a high density without buckling the wedge, and a coil insertion apparatus including the wedge insertion machine.

  In order to improve the drive capability of the electric motor, the coil wire is wound at a high density in a slot which is an opening arranged in an annular shape on the inner peripheral side of the stator core constituting the electric motor. As a method of winding a coil at a high density around a slot of a stator core, a coil insertion method is known in which a coil bundle in which a coil wire is wound at a high density is formed in advance and the coil bundle is pushed through a streak gap on the inner surface of the slot. It has been.

  In this method, a coil bundle is inserted into a slot through the following steps. First, slot insulating paper that insulates the coil wire from the stator core is inserted in advance into the slot inner surface portion excluding the streak-like gaps on the inner surface of the stator core slot. A coil bundle is hooked in a gap between shafts that are arranged in an annular shape called a blade and a wedge guide, and extend in a comb shape, and a stator core is supported at the tip of the blade.

  Next, a coil bundle extrudate called a stripper is moved along the inner surface of the blade, and the hooked coil bundle is pushed into each slot from the streaky gap. At the same time, insert a wedge having a substantially U-shaped cross section into a position sandwiched between the inner surface of the streak gap and the coil bundle by pushing the end of the wedge with a wedge pusher (see FIG. 4). This is a coil insertion method in which the coil bundle and the stator core are insulated from each other by a slot insulating paper and a wedge.

  However, because the coil density is increased, when the coil bundle is pushed in, the blade that was hooked on the coil bundle is attracted to the coil bundle and deformed, or the insertion resistance when the wedge is inserted into the slot is reduced. In addition, in the conventional insertion method, the wedge may buckle and cannot be inserted into a predetermined position, causing an insulation failure and one of the causes of the failure of the motor.

  Japanese Patent Application Laid-Open No. 61-73555 discloses a technique in which a part of each wedge pusher is projected between adjacent blades (see FIG. 7). According to this technique, the blade and the wedge guide are attracted to the previously inserted coil and deformed, and the gap between the wedge guide and the wedge pusher becomes a predetermined distance or more and a gap for entering the wedge is opened. Also, the web portion of the wedge is pushed up while being supported by the portion protruding between the blades. As a result, the gap between the wedge guide and the wedge pusher opens due to deformation of the blade, etc., and even if the gap increases, the wedge does not get caught in it, and the wedge is pushed up to a predetermined position It was supposed to be.

  According to this technique, at the stage where the coil bundle and the wedge that are hooked on the blade are inserted together, the wedge moves together with the coil bundle, so the insertion resistance is small and the wedge can be inserted without buckling. . However, even with this technique, when the density of the coil bundle becomes high, there is a case in which it is impossible to insert the coil bundle to a predetermined position. That is, the coil is inserted to a predetermined position, and then the wedge is inserted until it slightly protrudes from the slot exit side, in other words, in the final insertion stage of the wedge, the coil is sandwiched between the inner wall of the slot and the coil bundle that does not move. As a result, the wedge receives a large insertion resistance. At that stage, the buckling of the wedge has occurred, or the wedge has come out of the wedge pusher, so that there has been a problem that the wedge cannot be inserted to a predetermined position.

  Japanese Patent Application Laid-Open No. 10-23699 discloses a technique in which a hole as a traction connecting portion is provided at a longitudinal end portion of a wedge, a corresponding traction means is connected, and the wedge is pulled and inserted. Has been. However, according to this technique, it is necessary to make a hole in the wedge in advance, and in addition to the wedge pusher, a wedge pulling means is necessary.

  Further, JP 2009-142092 A discloses that a wedge pressing surface at the tip of the wedge pusher is provided with a structure for preventing wedge positional displacement, and a step is provided on the side of the wedge, and the wedge is pushed up while being pulled. The technology to insert is public. And the position shift prevention structure is disclosed in which a protrusion is provided on at least one of the radial inner side and the outer side of the wedge pusher, a groove is provided on the pressing surface, or a rough surface is provided on the pressing surface. Yes. However, even in this technique, since the pressing area of the front end of the wedge is small, the wedge is pushed by the wedge pusher only by pressing the end of the wedge from below without pulling means for pulling up the wedge when inserting the wedge. There existed a subject that it might slip or buckle from a front-end | tip part, and may not be inserted in a predetermined position.

  In contrast, a claw that hooks the end of the web portion of the wedge having a substantially U-shaped cross-section is provided at a position below the stripper, and the end of the wedge is supported by the claw so that the stripper moves. It is also possible to insert the wedge by pushing it in. However, in this case, it is necessary to reconfigure the stripper by changing the position of the claw attached to the stripper each time the height of the stator core changes, and it takes time and effort to cope with the stator cores having different shapes.

  The width of the claw is narrower than the width of the axial gap formed by the adjacent wedge guides and the width of the slot gap. Therefore, when the width of the inner side of the slot is widened and the width of the web portion forming the connecting side of the wedge is increased, the claw is hooked and supported only near the central portion of the entire width of the connecting side. Become. In the stage of inserting the wedge until it slightly protrudes from the slot exit side, in other words, in the final insertion stage of the wedge in which a large insertion resistance is generated, a large pressing force is concentrated in the vicinity of the center portion of the web portion, and the web There was a possibility that the part buckled.

JP-A-61-73555 Japanese Patent Laid-Open No. 10-23699 JP 2009-142092 A

  The problem to be solved by the present invention is to provide a wedge insertion machine and a coil insertion device that can insert a wedge into a predetermined position without buckling without performing complicated processing on the wedge in advance. .

  According to a first aspect of the present invention, there is provided a blade comprising a plurality of blade shafts arranged in an annular shape and extending in a comb shape, and a wedge guide comprising a wedge guide shaft extending in a comb shape in contact with the outer surface of the blade shaft. A stator core in which a plurality of slots are arranged in an annular shape is held near the tip of the blade extending forward from the wedge guide, and a coil insertion gap between the adjacent blade shaft and a slot facing it The first gap is defined as the first gap, and the second gap is defined as the gap between the blade shaft and the wedge guide shaft that is in contact with the blade shaft, and is caught in the second gap. The present invention relates to a wedge insertion machine included in a coil insertion device in which a coil bundle moves from a second gap to a first gap and is pushed into the slot. The wedge insertion machine according to the first aspect of the present invention is a wedge insertion machine that inserts a wedge having a substantially U-shaped cross-sectional shape that follows the coil bundle and insulates the coil bundle from the stator core. A wedge pusher that pushes the wedge into the slot along a second gap, the wedge pusher including a push rod that forms a rod-like body, a tongue piece portion, and a claw portion, and the push rod The tip is a pressing portion that presses the wedge end, and the tongue piece is formed to extend forward from the second gap to the first gap along the side of the push rod. The width of the tongue piece portion is a width that matches the width of the second gap, and the depth of the tongue piece portion is a depth that extends in and out of the contact surface between the blade shaft and the wedge guide shaft, The nail portion is the tongue piece The tongue portion and the claw portion are supported by hooking the end portion of the wedge, and the tongue piece portion and the claw portion at the distal end portion of the push rod. The width of the gap portion is a width that matches the thickness of the wedge.

  The second gap is a gap formed by the blade shaft and the wedge guide shaft that is in contact with the blade shaft, and the two pairs adjacent to each other, and is a gap through which the coil bundle passes. Since the stripper pushes up the curved portion of the coil bundle end that is hooked in the second gap, the second gap in which the coil bundle is hooked is attracted to the coil bundle and is deformed. The wedge guide shaft will be slightly curved or twisted. However, the tongue piece is formed to extend forward from the second gap to the first gap along the side of the push rod, and the width of the tongue piece is equal to the second gap. The width is matched with the width, and the depth of the tongue piece is the depth extending inward and outward of the contact surface between the blade shaft and the wedge guide shaft. Thereby, even if a blade axis | shaft etc. deform | transform, the state which the tongue piece part was located in the 2nd clearance gap is maintained.

  In addition, since the width of the tongue piece portion is wide enough to match the second width, it is easier to follow the deformation of the blade and the wedge guide, and the wedge pusher is not biased in the guide space formed by the wedge guide. Further, the push rod does not greatly deviate in the slot hole following the deformation of the blade shaft or the like. As a result, the wedge being inserted and the tip of the wedge pusher are not misaligned, a gap that is biased to the side of the wedge pusher tip is not generated, and the wedge is not caught in the gap, so that the wedge is smoother. Can be inserted.

  The claw portion is formed at the distal end portion of the push rod so as to face the tongue piece portion, and the tongue piece portion and the claw portion hook and support the end portion of the wedge, and the push The width of the gap portion between the tongue piece portion and the claw portion at the rod tip portion is set to a width that matches the thickness of the wedge. Accordingly, the wedge is prevented from slipping off because the web end portion of the wedge is held therebetween.

  In addition, sandwiching the substantially central portion of the web portion at the edge of the wedge between the tongue piece portion and the claw portion that protrude from the tip, the corner portions of the corner portions that are difficult to deform that are bent portions of the web portion and the flange portion Since the vicinity is pushed and inserted by the pressing portion at the tip of the push rod, a non-biased pressing force acts on the wedge end, and the wedge is prevented from buckling. Further, even in the final insertion stage of the wedge having increased insertion resistance, the web surface of the wedge is supported by the tongue piece extending forward from the second gap to the first gap so that the flange portion is bent. Wedge buckling is unlikely to occur.

  Furthermore, if the extension line of the base end portion of the gap portion is matched with the pressing portion of the push rod, and the wedge end portion is pressed even at the base end portion of the gap portion, the entire wedge end portion is pushed. It is more suitable for preventing buckling of the wedge. Accordingly, even when the insertion resistance is large, the wedge can be inserted without buckling or damaging it, and it is possible to eliminate the defective insertion of the wedge or the failure of the electric motor due to buckling.

  In a coil insertion device including a wedge insertion machine, a wedge is arranged on an axis of a gap that guides a wedge formed by an adjacent wedge guide shaft in a wedge magazine that accumulates the wedge and arranges the wedge at a predetermined position. The wedge pusher is moved along its axis to push out the wedge. First, the upper part of the tongue piece portion facing the wedge is brought into contact with the web portion of the wedge. Further, the wedge pusher extends, guides the wedge to the base end of the gap portion along the obliquely inclined tongue piece portion, and sandwiches the web portion of the wedge between the gap portion and the tongue portion. As a result, it is easy to guide the wedge to a predetermined position at the tip of the push rod, and the wedge sandwiched between the tongue piece portion and the claw portion is guided to the predetermined position and reliably guided without dropping to the slot. It is possible.

  According to a second aspect of the present invention, in the wedge insertion machine according to the first aspect of the invention, the gap portion is more than the gap end from the open end of the gap portion so that the gap portion warps the web end portion of the wedge to the side opposite to the flange side. The base end of the portion is located on the axial center side.

  As for the cross-sectional shape of the wedge, both end portions of the web portion are bent to form a flange, which is substantially U-shaped. The gap portion is formed to be inclined or curved so that the web portion of the wedge is bent in the direction opposite to the side where the flange is formed. As a result, the web portion sandwiched between the tongue piece portion and the claw portion warps in the direction opposite to the flange-formed side, and the flange portion of the wedge protruding from the slot insertion opening forms the flange. It will not bend to the side where it was done. As a result, partial buckling of the flange portion on the slot insertion side can also be prevented, and defects in the motor due to wedge buckling can be eliminated. Here, the axis means the axis of the stator (hereinafter the same).

  According to a third aspect of the present invention, in the wedge insertion machine according to the first or second aspect, the length of the tongue piece extending from the push rod tip is longer than the protruding length of the wedge from below the slot. Is also characterized by a long time.

  After the insertion of the coil bundle into the stator core, the wedge is sandwiched between the coil bundle that does not move and the inner wall of the slot, and the wedge piece comes out of the slot even at the final stage of wedge insertion when the wedge insertion resistance has increased. The wedge is held in a state of supporting the entire length of the back surface of the web portion, and the wedge is sandwiched and restrained between the tongue piece portion and the coil bundle or the claw portion, and is not deformed. Accordingly, even when only the wedge is pushed in, the web portion can be prevented from being bent and buckled, and the wedge can be inserted to a predetermined position.

  According to a fourth aspect of the present invention, in the wedge insertion machine according to the first to third aspects, the slot side of the front part of the push rod is formed as an inclined part, the front part of the push rod is thinned, and the tongue piece part Is formed so as to extend from the base end of the inclined portion toward the front. The slot side of the tip part of the push rod facing the coil bundle hooked on the blade is formed obliquely so that the space between the wedge guides becomes large. This makes it difficult for the coil curve portion at the insertion end of the coil bundle into which the wedge is inserted to compete with the tip portion of the push rod. The inclination angle is preferably 5 degrees to 10 degrees.

  Further, the tongue piece portion extends from the base end of the inclined portion toward the front side, and the rigidity in the axial center inside / outside direction of the inclined portion that is thin and easily deformed is improved. As a result, the tilt angle is set to a small tilt angle so that it is difficult to compete with the coil bundle, and even if the tilted portion of the push rod tip becomes long, the deformation of the push rod tip portion does not increase, and the wedge is positioned at a predetermined position. Can be inserted without buckling. In addition, since the coil curve portion and the tip end portion of the push rod are unlikely to compete with each other, the coil wire is hardly damaged, and the cause of the failure of the electric motor is reduced.

  According to a fifth invention of the present invention, in the wedge insertion machine according to the first to fourth inventions, a streak-like longitudinal groove along the axial direction is formed on the axial center side of the front portion of the push rod, and the tongue piece The portion is fixed to the longitudinal groove. The wedge pusher is composed of a push rod part and a tongue piece part, and the tongue piece part is fitted and fixed in a longitudinal groove formed in the push rod tip part. It is preferable to fix with a high-strength anaerobic adhesive or the like. The wedge pusher of the wedge insertion machine of the present invention can be manufactured more easily than grinding and molding one shaft body. Further, when the two parts are integrated by welding, the shaft is deformed. However, deformation of the shaft can be prevented by fixing with an adhesive or the like. Thereby, the wedge insertion machine provided with the push rod with high accuracy at low cost can be manufactured.

  According to a sixth aspect of the present invention, in the wedge insertion machine according to the first to fifth aspects, a side edge portion of the claw portion protrudes laterally. Since the side edge of the claw protrudes laterally in the slot hole, the web portion of the wedge can be widely supported in the slot. As a result, the wedge can be inserted to a predetermined position without causing partial deformation of the central portion of the web portion of the wedge.

  A seventh invention of the present invention is a coil insertion device including the wedge insertion machine of the first to sixth inventions. According to the wedge insertion machine provided with the wedge pusher of the present invention, the wedge pusher can be manufactured separately from the stripper, and the manufacturing cost can be suppressed. Further, the stripper and the wedge pusher can be individually controlled and stretched. In a coil insertion device that inserts a multi-phase coil at a time, there is a time lag between the coil insertion operation of the phase inserted first and the coil insertion operation of the phase inserted later. Even so, it is possible to control so that the wedge is inserted into the previous phase by the push rod that operates first, and then the wedge is inserted by the push rod that operates later. Thereby, even in the multi-phase coil insertion device, it becomes easy to insert the wedge without buckling so as to protrude to a predetermined position in accordance with the insertion operation of the coil of each phase.

  Moreover, by using the coil insertion device including the wedge insertion machine of the present invention, a high-density coil bundle can be obtained only by changing the wedge insertion machine portion of the conventional coil insertion device, and further by changing only the wedge pusher portion. A stator core having a high driving ability in which is inserted can be manufactured. And the stator core which does not have the poor insertion of a wedge can be provided, suppressing the installation expense of manufacturing equipment. As a result, it is possible to provide an electric motor that is less likely to cause a failure resulting in poor insulation at low cost.

  According to the present invention, by inserting the wedge to a predetermined position without buckling, it is possible to prevent an insulation failure of the coil bundle and provide an electric motor with stable quality.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the outline | summary of this invention (Example 1). Sectional drawing explaining the longitudinal cross-section of a coil insertion apparatus (Example 1). The perspective view of a coil and a wedge insertion mechanism (Example 1). Explanatory drawing of the cross section of a coil and a wedge insertion mechanism (Example 1). Explanatory drawing of the principal part of this invention (Example 1). The perspective view of the front-end | tip of a conventional wedge pusher. The perspective view of the front-end | tip of the conventional improved type wedge pusher. Explanatory drawing of wedge insertion in the case of the conventional improved type. Explanatory drawing of wedge insertion in the case of the conventional improved type with a small inclination. An explanatory view of wedge insertion by a wedge pusher of the present invention (example 1). The perspective view of the front-end | tip of the wedge pusher of this invention (Example 2).

Example 1
For the purpose of inserting the coil bundle inserted into a predetermined position without damaging the wedge pusher from the tip of the wedge pusher and without buckling, the axis of the stator core of the wedge pusher (hereinafter referred to as the shaft center) is used. The tip of the surface on the opposite side is inclined, and the tongue piece is formed to protrude from the tip of the wedge pusher so as to straddle the slot opening on the opposite side of the inclined surface. On the outer side of the shaft center, a gap inclined obliquely leaving a claw portion was cut to provide a gap portion.

  Hereinafter, it will be described in detail with reference to the drawings. First, with reference to FIG. 1, the structure of the wedge pusher with which the wedge insertion machine of this invention is provided is demonstrated. FIG. 1 is an explanatory view for explaining the configuration of the wedge pusher 10 in which the wedge 40 that is the insulating paper is inserted into the slot of the stator core 50 that is the stator core of the electric motor to which the slot insulating paper 52 is attached. The slot 51 is a space between adjacent tooth portions 54 formed in the stator core 50 in an annular shape. In FIG. 1, one of the slots 51 is illustrated and described, but the wedge 40 is inserted by the wedge pusher 10 also in the other slots.

  The stator core is fixed to the stator core support portion 55 (see FIG. 2) in a state where the slot insulating paper 52 is attached in advance to three walls constituting the stator portion tooth portion 54 of each slot. The wedge 40 is guided along the wedge guide while being supported on the tip of the wedge pusher 10 extending in the axial direction of the stator core, and closes the streak-like gap 53 of the slot opened on the axial center side of the stator core. To be inserted. The coil bundle 60 (see FIG. 10) is insulated from the wall surface of the stator core surrounding the slot 51 by the slot insulating paper 52 and the wedge 40.

  The wedge pusher 10 includes a push rod 20 that is a shaft body and a tongue piece 30. The tip of the push rod is formed with an inclined portion 21 so that the tip of the opposite surface is thinner than the axis. In addition, a tongue piece 30 is formed to project from the axial center surface of the push rod 20. The tongue piece portion 30 is fixed to a longitudinal groove 35 (see FIG. 5) having a width corresponding to the thickness of the tongue piece portion 30 with an adhesive having a high adhesive strength on the axial center side surface of the push rod 20. ing. However, it does not necessarily need to be bonded, and may be formed by integral molding.

  The thickness of the tongue piece 30 is preferably a width corresponding to the streak-like gap 53 of the slot. However, when the stator core is supported by the vertical streak projections 76 from both edges of the blade shaft inside the streak gap of the slot as shown in FIG. 4, the streaks sandwiched between the projections Any width corresponding to the gap may be used. In contrast to this, when the width of the gap formed by adjacent wedge guide shafts is narrower than the width of the streak-shaped gap, the width may be a width corresponding to the width of the gap formed by the wedge guide shaft.

  The length (H0) of the protruding portion 32 of the tongue piece portion 30 protruding from the distal end surface 22 of the push rod 20 is longer than the length (H1) of the wedge protruding end 45 protruding from the slot (see FIG. 10). Is done. The tongue piece 30 is formed with a gap proximal end of the gap 34 so as to have the same height as the distal end surface 22 of the push rod 20. Further, from the base end surface of the gap portion 34, the claw portion 33 extends so as to be inserted into the slot so as to sandwich the wedge, thereby forming a gap portion corresponding to the thickness of the wedge.

  The wedge 40 has a substantially U-shaped cross section, and includes a long web 41 and flange portions 42 and 43 that are folded from both edges of the web 41 and extend in the same direction as the web. The length of the wedge is longer than the thickness of the stator core 50 by the length of the insulation surplus length (H1) protruding upward and downward from the slot 51 (see FIG. 10). The insulation surplus length is about 4 mm.

  Next, the coil insertion device 1 to which the wedge pusher 10 is applied will be described with reference to FIGS. 2 is a sectional view for explaining a longitudinal section of the coil insertion device, FIG. 3 is a perspective view of the coil and wedge insertion mechanism, and FIG. 4 is an explanatory view of a transverse section of the coil and wedge insertion mechanism. FIG. 3 shows a perspective view of the stripper 71 extending along the blade shaft 72 for inserting the coil bundle into the slot. Further, an auxiliary stripper 74 is formed at the tip of the stripper 71 to push in the coil bundle inserted in advance when the two-phase coil bundles 60 and 61 are inserted.

  The coil insertion device 1 includes a coil insertion mechanism 70 for inserting the coil bundle 60 into the slot 51 and a wedge insertion machine 90 for inserting a wedge into the slot while the stator core 50 is fixed by the stator core support portion 55. The coil insertion mechanism 70 includes a stripper 71, a blade, a wedge guide, and a stripper driving unit (not shown). The wedge insertion machine 90 includes a wedge pusher 10, a wedge magazine 91, and a wedge pusher drive unit (not shown).

  Here, the blade is composed of a blade shaft 72 arranged in a ring shape so as to extend in a comb shape (see FIG. 3). The stripper 71 is formed with external teeth 75 at positions corresponding to the gaps formed between the adjacent blade shafts 72, and extends along the blade shaft 72 inwardly of the blades, to the blade shaft 72 and the wedge guide shaft 73. The hooked coil bundle 60 is inserted by being pushed into the slot 51 from the gap 53 (see FIG. 1) on the axial center side of the slot.

  The wedge guide shaft 73 is arranged along the blade shaft 72 in alignment with the outside of the blade shaft 72, and forms a streak-like space for guiding the wedge 40 to the slot 51 between the adjacent shafts. The stripper 71 according to the first embodiment is provided with an auxiliary stripper 74 that guides a coil bundle of different phases in advance of a coil bundle of another phase, and a multi-phase coil bundle is inserted by one stretching operation of the stripper. It has come to be. The wedge pusher 10 supports the wedge 40 and extends in accordance with the extension of the stripper 71 along the space.

  Here, the relationship between the coil bundle 60 inserted into the slot 51 and the wedge 40 will be described with reference to the cross section of the coil insertion mechanism 70 shown in FIG. In FIG. 4, the cross section at the position in FIG. 2A, the stator core located above the cross section, the stripper, and the coil bundle are shown in an overlapping manner. The coil bundle includes a coil bundle 60 inserted in advance by the auxiliary stripper 74 (shown by a solid line in FIG. 4) and a coil bundle 61 inserted by following the coil bundle 60 (shown by a two-dotted line in FIG. 4). Are alternately caught in the gap between the pair of blade shafts 72, the wedge guide shaft 73 and the adjacent group. The wedges 40 are inserted into the slots in the gaps following the insertion of the coil bundles.

  Here, with reference to FIG. 5, the wedge pusher 10 which is the characteristic part of Example 1 is demonstrated in detail. FIG. 5A is an enlarged view of a part of the cross section (position of FIG. 2B) of the coil insertion mechanism 70. FIG. 5 (B) is a plan view of the wedge pusher in a state of being supported with the wedge interposed therebetween, FIG. 5 (C) is a front view of the same state, and FIG. 5 (D) is a right side view of the same state. The figure is shown. The cross-sectional shape of the push rod 20 which is the shaft portion of the upper tip wedge pusher 10 is a shape corresponding to the cross-sectional shape of the gap formed by the adjacent wedge guides 73 and 73 (FIG. 5A). The tip portion of the push rod 20 is formed with an inclined surface 21 on the side opposite to the axis so that the tip is thin. The inclination angle (α) is set to 5 degrees in order to avoid interference with the coil bundle.

  On the other hand, since the tip of the push rod becomes thin, the protruding height (γ) of the tongue piece in the axial direction inside and outside the shaft is set to a required protruding dimension, and deformation in the axial direction inside and outside is prevented. In Example 1, the protrusion dimension (γ) is 4 mm. The width of the wedge groove for supporting the wedge is a width corresponding to the thickness of the wedge of 0.5 mm, and the length (β) of the tip portion of the tongue piece portion protruding from the slot is from the slot. It is formed longer than the length (δ) of the claw portion corresponding to the length of the wedge protruding end 45 (see FIG. 10) to be protruded. In Example 1, the length (β) of the tip portion of the tongue piece portion is 13 mm, and the length (δ) of the claw portion is 4 mm. Moreover, the width | variety of the front-end | tip part of a push rod is formed at least wider than the width | variety of the web part 41 of a wedge, and it can be pushed in contact with the flange parts 42 and 43 of the both sides bent from a web part.

  Here, the operation of the wedge insertion by the wedge pusher according to the first embodiment will be described in detail with reference to FIGS. 6 is a perspective view of the tip of a conventional wedge pusher, FIG. 7 is a perspective view of the tip of a conventional improved wedge pusher, FIG. 8 is an explanatory view of wedge insertion in the case of a conventional improved type, and FIG. FIG. 10 is an explanatory view of wedge insertion by the wedge pusher according to the first embodiment.

  First, the shape of the tip of the conventional push rod 80 will be described with reference to the perspective view shown in FIG. An inclined portion 82 is formed at the push rod tip 81. In the case of this push rod shape, when the wedge slips on the back surface opposite to the inclined surface, there is a problem that the wedge cannot be pushed out by being sandwiched between the wedge pusher and the wedge guide shaft. Therefore, as shown in the perspective view of FIG. 7, in the improved push rod 83, a protrusion 86 is provided on the opposite side of the tip inclined surface 85 so as to enter the wedge guide gap, and the wedge is inclined to the inclined surface 85. I was prevented from slipping back to the opposite side.

  However, in order to prevent the wedge from slipping outside the axial center, if the length of the tip of the push rod is increased in the axial direction, the corner edge of the tip of the push rod that supports the protruding end 45 of the wedge. 63 is in contact with the end 62 of the coil bundle, which has become difficult to bend due to high insertion density, and the possibility of damaging the end of the coil bundle is increased (see FIG. 8). Further, when the length of the push rod tip 84 in the axial direction inside and outside is reduced and the inclination angle is reduced (see FIG. 9), the wedge protruding end 45 is moved at the final stage of wedge insertion where the wedge insertion resistance increases. By easily buckling from the push rod tip 84 to the push rod slant surface side 87 and buckling (buckled portion is indicated by 46), the upper portion 44 of the wedge can be inserted into a predetermined position protruding from the slot. In some cases, the coil bundle protruding from the upper portion of the stator core and the teeth 54 of the stator core cannot be insulated by the upper portion 44 of the wedge.

  The operation of the wedge pusher according to the first embodiment will be described with reference to FIG. First, the protruding portion 32 of the tongue piece portion 30 is higher than the height (H1) of the protruding end 45 of the wedge, extends from the push rod front end surface 22 to protrude a predetermined height (H0), and the wedge 40 is finally inserted. It becomes the state which contact | connected the axial center inner side of the web part which became. The protruding end 45 of the web portion of the wedge is sandwiched between the outer side of the axial center of the front portion 32 and the claw portion 33 that forms the gap portion 34 by separating the distance of the thickness of the wedge 40 therefrom. The base end of the gap is positioned on the inner side of the axial center from the open end of the gap 34, and the protruding end 45 of the wedge is on the inner side of the axis opposite to the direction in which the flange is formed. To warp. The push rod tip 22 is positioned at the same height as the gap base end of the gap 34, touches the entire web end surface of the wedge 40, pushes up the wedge in the extending direction of the wedge pusher 20, and is inserted into the slot. To do. On the outer side of the axial center of the push rod 20, a small inclined portion 21 is formed from the tip of the claw portion 33, and the position of the end portion 62 of the coil bundle that is difficult to be bent from the slot of the coil bundle 60 is less likely to compete. It is hard to damage the coil bundle.

(Example 2)
Next, with reference to FIG. 11, Embodiment 2 in which the tip of the push rod is cut to form a claw portion extending from the inclined surface and the tongue piece portion is fixed to the back surface thereof will be described. The wedge pusher according to the second embodiment is provided with a claw portion 36 having a chamfer portion 36 whose outer edge is gently curved at the tip thereof by grinding the outer side of the axial center of the push rod 20 at the same small angle as in the first embodiment. A surface 21 is formed. Wedge extruding portions 24 (22, 34) having the same height in the axial direction are formed at the base end portion of the claw portion so as to surround both sides of the base end portion and the opposite side to the inclined surface.

  On the opposite side of the inclined surface of the push rod, an axial longitudinal groove (see FIG. 5 of the first embodiment) formed in the vicinity of the tip of the push rod has a tongue piece portion 30 having a width matching the width of the longitudinal groove. Insert and fix. The tongue piece 30 is fixed to the surface on the opposite side of the inclined surface in the axial direction, and the protrusion 32 extends beyond the tip of the claw, and the protrusion of the wedge extends longer than the length protruding from the slot. ing. A gap 34 is provided between the tongue piece 30 and the claw 36 with an interval corresponding to the thickness of the wedge. Then, the web portion of the wedge is sandwiched between the gap portions 34 so as not to slip off from the push rod tip 22 inward and outward of the axial center. Further, the wedge web portion is pushed by the pushing portion located at the base end portion of the gap portion 34, and the wedge flange portion is pushed by the pushing portion of the push rod tip 22 portion located on both sides of the claw portion, so that the shaft of the wedge is pushed. Push up the direction end without biasing. Thus, even in the final insertion stage where a large insertion resistance is received, the wedge does not slip off from the tip of the wedge pusher, and is inserted to a predetermined position without buckling.

(Other examples)
In the first embodiment, an example in which the axis of the stator core is set in the vertical direction has been described. However, the setting direction of the stator core is not limited, and a coil may be inserted with the axis set in the horizontal direction.
・ Wedge insertion machine provided a wedge magazine under the stator core and pushed out the wedge with a wedge pusher from below, but provided a wedge magazine at another position to correspond to the position of the slot opening. After the wedges are arranged, the wedges arranged below the stator core may be moved and then pushed up.

-Although the coil insertion apparatus of the Example demonstrated the Example regarding the stator wound by 2 phases, there is no limitation in the number of phases.
-It is good also as a mechanism which includes the coil insertion apparatus containing the summary of this invention in a series of manufacturing lines.
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The technical scope of the present invention is shown not by the above description but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

1: coil insertion device, 10: wedge pusher, 20: push rod, 30: tongue piece, 40: wedge, 50: stator core, 60, 61: coil bundle, 70: coil insertion mechanism, 90: wedge insertion machine, 91 : Wedge magazine, 21: Inclined surface, 22: Tip surface, 24: Wedge extruding part, 32: Protruding part, 33: Claw part, 34: Gap part, 35: Vertical groove, 36: Claw part, 42, 43: Flange 44: Upper part of the wedge, 45: Projection end, 51: Slot, 52: Slot insulating paper, 53: Streaky gap, 54: Tooth part, 55: Stator core support part, 62: End part of coil bundle, 71: Stripper, 72: Blade shaft, 73: Wedge guide shaft, 74: Auxiliary stripper, 75: External teeth, 76: Projection, 80: Conventional push rod, 81: Push rod tip, 82: Tilt Parts, 83: improved pushrod, 84: tip, 85: inclined surface, 86: protruding portion, 87: inclined surface

Claims (7)

A blade comprising a plurality of blade shafts arranged in a ring and extending in a comb-teeth shape; and a wedge guide comprising a wedge guide shaft extending in a comb-teeth shape in contact with the outer surface of the blade shaft and extending forward from the wedge guide In addition, the stator core in which a plurality of slots are arranged annularly is held near the tip of the blade,
A gap formed by connecting a gap between adjacent blade shafts and a coil insertion gap of a slot facing the blade shaft is defined as a first gap, and a set of the blade shaft and the wedge guide shaft in contact with the blade shaft is adjacent to each other. The coil gap is formed as a second gap, and the coil bundle hooked in the second gap is moved from the second gap to the first gap and pushed into the slot, and follows the coil bundle. Then, in a wedge insertion machine for inserting a wedge having a substantially U-shaped cross-sectional shape that insulates the coil bundle and the stator core,
A wedge pusher that pushes the wedge into the slot along a second gap;
The wedge pusher includes a push rod that forms a rod-like body, a tongue piece portion, and a claw portion,
The push rod is a pressing portion whose tip pushes the wedge end,
The tongue piece is formed to extend forward from the second gap to the first gap along the side of the push rod, and the width of the tongue piece is equal to the width of the second gap. A width to be aligned, and the depth of the tongue piece portion is a depth extending in and out of the contact surface between the blade shaft and the wedge guide shaft,
The claw portion is formed at the tip of the push rod so as to face the tongue piece portion,
The tongue piece portion and the claw portion hook and support the end portion of the wedge, and the width of the gap portion between the tongue piece portion and the claw portion at the distal end portion of the push rod matches the thickness of the wedge. The width to be,
A wedge insertion machine characterized by that. The base end of the gap portion is positioned on the axial center side from the open end of the gap portion so that the gap portion warps the web end portion of the wedge to the side opposite to the flange side.
The wedge insertion machine according to claim 1. The length of the tongue piece extending from the push rod tip is longer than the protruding length of the wedge from below the slot;
The wedge insertion machine according to any one of claims 1 and 2, wherein the wedge insertion machine is provided. The slot side of the front part of the push rod is formed as an inclined part, the front part of the push rod is thinned, and the tongue piece part is formed extending from the base end of the inclined part toward the front,
The wedge insertion machine according to any one of claims 1 to 3, wherein the wedge insertion machine is provided. A streak-like longitudinal groove along the axial direction is formed on the axial center side of the front part of the push rod, and the tongue piece part is fixed to the longitudinal groove.
The wedge insertion machine according to any one of claims 1 to 4, wherein the wedge insertion machine is provided. The side edge of the nail part protrudes to the side,
The wedge insertion machine according to any one of claims 1 to 5, wherein the wedge insertion machine is provided. It is equipped with the wedge insertion machine according to any one of claims 1 to 6.
A coil insertion device characterized by that.

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