Twisting device of hair pin type stator coil

Abstract

A twisting device for a hairpin-type stator coil is disclosed. A twisting device for a hairpin-type stator coil according to an exemplary embodiment of the disclosed invention is configured to twist and mold a plurality of hairpin-type stator coils inserted in a plurality of layers into a stator core, and may include i) a base frame; ii) a coil fixing unit installed on the base frame via a plurality of support rods; iii) a twisting tool unit installed on the base frame so as to be movable up and down on the lower side of the coil fixing unit, wherein a plurality of stator coils of two adjacent layers among the plurality of layers are fitted therein and are rotatably provided for each of the two layers; and iv) a tool driving unit installed on the base frame and operatively connected to the twisting tool unit.

Description

Technology Field

[0001] An embodiment of the present invention relates to a stator manufacturing system of the hairpin winding type, and more specifically, to a twisting device for a hairpin type stator coil configured to twist and mold a plurality of hairpin type stator coils inserted into a stator core. Background Technology

[0002] Generally, hybrid or electric vehicles, referred to as eco-friendly vehicles, utilize technology that generates driving force through a drive motor.

[0003] To reduce the weight and volume of vehicles and parts, automakers and eco-friendly parts manufacturers are applying drive motors with stators wound with hairpin-type stator coils.

[0004] Such a stator is manufactured through a process of inserting multiple hairpin-type stator coils (hereinafter referred to as 'multiple stator coils' for convenience) into multiple slots of a stator core, and a process of welding the multiple stator coils inserted into the multiple slots.

[0005] Meanwhile, prior to the welding process of multiple stator coils, a coil widening process for expanding the spacing of the welds of multiple stator coils and a coil twisting process for twisting the widened welds are performed.

[0006] Among these, in the coil twisting process, a coil twisting device is used to twist and form the welds of multiple stator coils layer by layer. Such coil twisting devices are being developed with structures that lower equipment unit costs and are advantageous in terms of maintenance.

[0007] The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. The problem to be solved

[0008] Embodiments of the present invention aim to provide a twisting device for a hairpin-type stator coil that enables the welding portions of a plurality of stator coils inserted into a stator core to be twisted and formed with a simple configuration. means of solving the problem

[0009] A twisting device for a hairpin-type stator coil according to an embodiment of the present invention is configured to twist and mold a plurality of hairpin-type stator coils inserted in a plurality of layers into a stator core, and may include i) a base frame; ii) a coil fixing unit installed on the base frame through a plurality of support rods; iii) a twisting tool unit installed on the base frame so as to be movable up and down on the lower side of the coil fixing unit, wherein a plurality of stator coils of two adjacent layers among the plurality of layers are fitted therein and are rotatably provided for each of the two layers; and iv) a tool driving unit installed on the base frame and operatively connected to the twisting tool unit.

[0010] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the coil fixing unit may include a plurality of coil fixing members that are operatively connected to an actuator installed on the base frame and are configured to reciprocate radially by the actuator.

[0011] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the coil fixing unit may include a coil guide passage formed between the plurality of coil fixing members to fix the plurality of stator coils along the layer direction.

[0012] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the coil fixing unit may include a support disk positioned between the upper surface of the base frame and the twisting tool unit on the inside and spaced apart from the upper surface of the base frame through the plurality of support rods, a slot disk rotatably coupled to the support disk, a guide disk fixed to the support disk with the slot disk on the lower side, a plurality of coil fixing members radially slidably coupled to the guide disk, a plurality of cam lobes fixed to the plurality of coil fixing members and coupled to the slot disk by penetrating the guide disk, and an actuator installed on the base frame and connected to the slot disk.

[0013] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the support disk may include a plurality of cam follower rail grooves formed radially on the upper surface.

[0014] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the slot disk may include a plurality of cam follower slots formed in a cyclone shape.

[0015] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the guide disk may include a plurality of guide rails formed radially on the upper surface and a plurality of guide rail holes formed between the plurality of guide rails.

[0016] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the plurality of cam lobes can penetrate the plurality of guide rail holes and the plurality of cam follower slots vertically and be coupled to the plurality of cam follower rail grooves.

[0017] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the actuator may include an operating cylinder installed on a mounting block mounted on the base frame and operably connected to an extension extending outwardly from the edge of the slot disk, a rail block fixed to the mounting block, a sliding block connected to the operating rod of the operating cylinder and slidably coupled to the rail block, and a fixing pin fixed to the sliding block and penetrating the extension vertically.

[0018] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, each of the plurality of coil fixing members may include a guide arm slidably coupled to the plurality of guide rails and a guide finger integrally connected to the guide arm to fix the plurality of stator coils along the layer direction.

[0019] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the twisting tool unit may include a lifting member movably coupled to the plurality of support rods in an up-and-down direction, a cylindrical outer twisting jig rotatably coupled to the lifting member and having a plurality of first coil insertion grooves formed spaced apart along the circumferential direction, and a cylindrical inner twisting jig rotatably installed on the inner side of the outer twisting jig in a direction opposite to the rotation direction of the outer twisting jig and having a plurality of second coil insertion grooves formed spaced apart along the circumferential direction.

[0020] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the outer twisting jig and the inner twisting jig can be mutually coupled so as to be moved in the up and down direction by the lifting member.

[0021] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the twisting tool unit may further include a cam follower that is fixed to the outer twisting jig and coupled to at least one cam slot formed inclined along the circumferential direction in the inner twisting jig.

[0022] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the outer twisting jig can be moved in the up and down direction by the cam follower by a set angle of inclination of the at least one cam slot.

[0023] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the outer twisting jig may include a first crown member in which a plurality of first coil insertion grooves are formed along the upper and lower directions on the inner surface.

[0024] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the inner twisting jig may include a second crown member in which the plurality of second coil insertion holes are formed along the upper and lower directions on the outer surface.

[0025] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the inner surface of the first crown member and the outer surface of the second crown member are in contact with each other, and each of the plurality of first coil insertion grooves and each of the plurality of second coil insertion holes may face each other.

[0026] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the outer twisting jig may include a first edge projection formed at the opening end of the plurality of first coil insertion grooves.

[0027] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the inner twisting jig may include a second edge projection formed at the opening end of the plurality of second coil insertion holes.

[0028] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the tool driving unit may include a housing fixed to the base frame, an outer shaft rotatably installed inside the housing, a first jig operating part operably connected to the outer twisting jig through the outer shaft, and a second jig operating part rotatably installed inside the outer shaft, an inner shaft operably connected to the inner twisting jig through the inner shaft.

[0029] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the tool driving unit may further include a lift driving unit installed in the housing and connected to the lifting member.

[0030] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the first jig operating part may include a first key adapter fixed to the upper end of the outer shaft and key-coupled with the outer twisting jig, a first servo motor installed in the housing, a first driving pulley connected to the first servo motor, a first driven pulley connected to the outer shaft, and a first belt connecting the first driving pulley and the second driven pulley.

[0031] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the second jig operating part may include a second key adapter fixed to the upper end of the inner shaft and key-coupled with the inner twisting jig, a second servo motor installed in the housing, a second driving pulley connected to the second servo motor, a second driven pulley connected to the inner shaft, and a second belt connecting the second driving pulley and the second driven pulley.

[0032] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the first key adapter may include at least one first key coupled to at least one first key groove formed at the lower end of the outer twisting jig.

[0033] In addition, in the twisting device of the hairpin-type stator coil according to an embodiment of the present invention, the second key adapter may include at least one second key coupled to at least one second key groove formed at the lower end of the inner twisting jig.

[0034] In addition, in the twisting device of the hairpin type stator coil according to an embodiment of the present invention, the lift drive unit may include a third servo motor installed in the housing and a nut block fixed to the lifting member and screw-coupled to the motor shaft of the third servo motor. Effects of the invention

[0035] Embodiments of the present invention can simplify the overall structure, unlike complex structures that twist and form welds of multiple stator coils across multiple layers.

[0036] Furthermore, other effects that can be obtained or predicted by the embodiments of the present invention will be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. That is, various effects predicted according to the embodiments of the present invention will be disclosed within the detailed description to be set forth below. Brief explanation of the drawing

[0037] The embodiments of this specification may be better understood by referring to the following description in conjunction with the attached drawings, in which similar reference numerals refer to identical or functionally similar elements. FIG. 1 is a drawing illustrating one example of a hairpin winding type stator applied to embodiments of the present invention. FIG. 2 is a front view illustrating a twisting device for a hairpin-type stator coil according to an embodiment of the present invention. FIGS. 3 and 4 are perspective views illustrating a twisting device for a hairpin-type stator coil according to an embodiment of the present invention. FIG. 5 is a combined perspective view illustrating a coil fixing unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention. FIG. 6 is an exploded perspective view illustrating a coil fixing unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention. FIG. 7 is a plan view illustrating a support disk of a coil fixing unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention. FIG. 8 is a plan view illustrating a slot disk of a coil fixing unit applied to a twisting device of a hairpin type stator coil according to an embodiment of the present invention. FIG. 9 is a plan view illustrating a guide disk of a coil fixing unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention. FIG. 10 is a plan view illustrating a plurality of coil fixing members of a coil fixing unit applied to a twisting device of a hairpin type stator coil according to an embodiment of the present invention. FIGS. 11 and 12 are combined perspective views illustrating a twisting tool unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention. FIGS. 13 and 14 are exploded perspective views illustrating a twisting tool unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention. FIG. 15 is a drawing showing a first crown member and a second crown member applied to a twisting tool unit of a twisting device of a hairpin type stator coil according to an embodiment of the present invention. FIG. 16 is a drawing illustrating a cam follower coupling structure of a twisting tool unit applied to a twisting device of a hairpin type stator coil according to an embodiment of the present invention. FIGS. 17 to 19 are drawings illustrating a tool driving unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention. The drawings referenced above are not necessarily drawn to scale and should be understood as presenting somewhat simplified representations of various preferred features illustrating the basic principles of the invention. For example, specific design features of the invention, including specific dimensions, orientations, positions, and shapes, will be partially determined by specific intended applications and usage environments. Specific details for implementing the invention

[0038] The terms used herein are for the purpose of describing specific embodiments and are not intended to limit the invention. As used herein, the singular form is intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising” as used herein indicate the presence of the specified features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, components, and / or groups thereof. As used herein, the term “combined” indicates a physical relationship between two components in which the components are directly connected to each other or indirectly connected through one or more mediating components.

[0039] Furthermore, as used herein, the term “and / or” includes any one or all combinations of one or more items listed in association. And, the term “operably connected” or a similar term means that at least two members are connected directly or indirectly to each other to transmit power. However, two operabably connected members are not always rotating at the same speed and in the same direction.

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0041] FIG. 1 is a drawing illustrating one example of a hairpin winding type stator applied to embodiments of the present invention.

[0042] Referring to FIG. 1, the hairpin winding type stator (1) applied to embodiments of the present invention can be applied to a drive motor for a hybrid vehicle and / or an electric vehicle as an eco-friendly vehicle that obtains driving force from electric energy.

[0043] The above-described drive motor includes a stator (1) applied to embodiments of the present invention and a rotor (not shown) disposed with a certain air gap from the stator (1). In one example, the drive motor may include a permanent magnet synchronous motor (PMSM).

[0044] Here, the stator (1) includes a stator core (3) in which a plurality of electrical steel sheets are laminated. The stator core (3) includes an outer diameter surface and an inner diameter surface, and includes a plurality of slots (5) (e.g., 48 slots) formed radially along the radial direction.

[0045] And, the stator core (3) includes a plurality of stator coils (7) (commonly referred to as 'segment coils' or 'flat coils' by those skilled in the art) wound in a plurality of slots (5).

[0046] Each of the plurality of stator coils (7) is provided in a hairpin type. In one example, each of the plurality of stator coils (7) may be provided in a V-shaped hairpin type. In another example, each of the plurality of stator coils (7) may be provided in a U-shaped or I-shaped hairpin type. Furthermore, each of the plurality of stator coils (7) may be provided as a square coil with a square cross section.

[0047] A plurality of such stator coils (7) are inserted into a plurality of slots (5) of the stator core (3) and welded to form a set electrical circuit.

[0048] As described above, although the embodiments of the present invention have been explained as being applied to a hairpin winding type stator of an automotive drive motor, the scope of protection of the present invention should not be understood as necessarily being limited thereto, and the technical concept of the present invention may be applied to any drive motor of various types and uses employing a hairpin type stator.

[0049] FIG. 2 is a front view illustrating a twisting device for a hairpin-type stator coil according to an embodiment of the present invention.

[0050] Referring to FIGS. 1 and 2, the twisting device (100) of a hairpin type stator coil according to an embodiment of the present invention can be applied to the process of assembling a hairpin winding type stator (1) among the processes of assembling a drive motor.

[0051] Furthermore, the twisting device (100) of a hairpin-type stator coil according to an embodiment of the present invention can be applied to a post-processing process for a plurality of stator coils (7) inserted into a plurality of slots (5) of a stator core (3) in a coil inserting process. This coil post-processing process may include a coil widening process, a coil twisting process, and a coil welding process.

[0052] The twisting device (100) of a hairpin-type stator coil according to an embodiment of the present invention can be applied to the coil twisting process among the above-described post-processing processes. In the coil twisting process, a plurality of stator coils (7) that have been widened in the coil widening process can be twisted using the twisting device (100) of a hairpin-type stator coil according to an embodiment of the present invention. The reason for twisting the plurality of stator coils (7) in this manner is to align the current flow paths of the plurality of stator coils (7).

[0053] In the following description, the end portions of the plurality of stator coils (7) that penetrate the plurality of slots (5) of the stator core (3) are referred to as welded portions (9). The welded portions (9) of the plurality of stator coils (7) can be welded together in a coil welding process of a post-processing process.

[0054] In the present specification, the arrangement direction of a plurality of stator coils (7) sequentially inserted into a plurality of slots (5) from the radially outer side to the inner side of the stator core (3) can be defined as a layer direction.

[0055] In this specification, the position point of the stator coil (7) located at the outermost radial side is referred to as the first layer. Additionally, the position points of a plurality of stator coils (7) located sequentially from the first layer toward the inner radial side may be referred to as the second, third, fourth, fifth, sixth... layers.

[0056] Furthermore, in this specification, the 'upper part', 'upper', 'upper', or 'upper surface' of a component indicates an end, part, end, or surface of a component that is relatively upper in the drawing, and the 'lower part', 'lower', 'lower', or 'lower surface' of a component indicates an end, part, end, or surface of a component that is relatively lower in the drawing.

[0057] Additionally, in this specification, an end of a component (e.g., one end or the other end, etc.) indicates an end of the component in any one direction, and an end portion of a component (e.g., one end or the other end, etc.) indicates a certain part of the component including the end.

[0058] Meanwhile, in the coil twisting process, while the stator core (3) is gripped by the core gripper (101), the welded portions (9) of a plurality of stator coils (7) can be twisted and formed by the hairpin type stator coil twisting device (100) according to an embodiment of the present invention. Here, the core gripper (101) is mounted on the robot arm (105) of a robot (103) that is configured to move along a programmed set trajectory.

[0059] The core gripper (101) is configured to grasp the outer diameter surface or the inner diameter surface of the stator core (3) and is rotatable with respect to the robot arm (105). The robot (103) may be any robot (103) known to those with ordinary knowledge in the art to date.

[0060] The twisting device (100) of a hairpin-type stator coil according to an embodiment of the present invention is structured to be able to twist and form the welded portions (9) of a plurality of stator coils (7) inserted into a stator core (3) with a simple configuration.

[0061] FIGS. 3 and 4 are perspective views illustrating a twisting device for a hairpin-type stator coil according to an embodiment of the present invention.

[0062] Referring to FIGS. 1 to 4, the twisting device (100) of the hairpin type stator coil according to an embodiment of the present invention basically includes a base frame (110), a coil fixing unit (310), a twisting tool unit (510), and a tool driving unit (710).

[0063] In an embodiment of the present invention, the base frame (110) is installed on the floor of a coil widening process workshop. The base frame (110) is equipped with components to be described below.

[0064] In one example, the base frame (110) includes a base plate (111) spaced upward from the floor of the process workshop. The base frame (110) is provided with at least one support member (113) that is connected to the lower surface of the base plate (111) and extends downward.

[0065] In an embodiment of the present invention, the coil fixing unit (310) is configured to fix a plurality of stator coils (7) inserted in a layer direction into the slots (5) of the box of the stator core (3).

[0066] The coil fixing unit (310) is installed on the base frame (110) via a plurality of support rods (311). The plurality of support rods (311) are fixed to the upper surface of the base plate (111) and extend in the vertical direction from the upper surface. The coil fixing unit (310) is installed at the upper end of the plurality of support rods (311) and is positioned spaced apart from the upper surface of the base plate (111).

[0067] FIG. 5 is an assembled perspective view showing a coil fixing unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention, and FIG. 6 is an exploded perspective view showing a coil fixing unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention.

[0068] Referring to FIGS. 5 and 6, the coil fixing unit (310) according to an embodiment of the present invention includes a support disk (321), a slot disk (331), a guide disk (341), a plurality of coil fixing members (351), a plurality of cam lobes (361), and an actuator (371).

[0069] The support disk (321) is provided as a disk plate having a disk hole (323) formed therein. The support disk (321) is fixed to the upper end of a plurality of support rods (311) and is positioned spaced apart from the upper surface of the base plate (111).

[0070] As shown in FIG. 7, the support disk (321) includes a plurality of cam follower rail grooves (325) formed radially along the radial direction on the upper surface. The plurality of cam follower rail grooves (325) are formed in a straight line between the outer edge end and the inner edge end of the support disk (321).

[0071] The slot disk (331) is provided as a disk plate corresponding to the shape of the support disk (321). The slot disk (331) is placed on the upper surface of the support disk (321) and is rotatably coupled to the support disk (321).

[0072] As shown in FIG. 8, the slot disk (331) includes a plurality of cam follower slots (333) formed in a cyclone shape. The plurality of cam follower slots (333) are formed as rounded slot holes extending from the inner edge end of the slot disk (331) toward the outer edge end. The plurality of cam follower slots (333) are connected vertically to the plurality of cam follower rail grooves (325) of the support disk (321).

[0073] The guide disk (341) is provided as a disk plate corresponding to the shape of the support disk (321) and the slot disk (331). The guide disk (341) is fixed to the support disk (321) with the slot disk (331) positioned below it. That is, the slot disk (331) is rotatably positioned between the support disk (321) and the guide disk (341).

[0074] As shown in FIG. 9, the guide disk (341) includes a plurality of guide rails (343) and a plurality of guide rail holes (345).

[0075] The plurality of guide rails (343) are formed radially along the radial direction on the upper surface of the guide disk (341). The plurality of guide rails (343) are arranged spaced apart at set intervals along the circumferential direction on the upper surface of the guide disk (341).

[0076] The plurality of guide rail holes (345) are each formed between the plurality of guide rails (343). Each of the plurality of guide rail holes (345) is vertically connected to each of the plurality of cam follower slots (333) of the slot disk (331) and each of the plurality of cam follower rail grooves (325) of the support disk (321).

[0077] The plurality of coil fixing members (351) are configured to substantially fix the plurality of stator coils (7) along the layer direction. The plurality of coil fixing members (351) are radially slidably coupled to the guide disk (341).

[0078] Each of the plurality of coil fixing members (351) includes a guide arm (353) and a guide finger (355), as shown in FIG. 10.

[0079] The guide arm (353) is radially and slidably coupled to a plurality of guide rails (343) of the guide disk (341). The guide finger (355) is integrally connected (extended) to the guide arm (353) to secure a plurality of stator coils (7) along the layer direction.

[0080] In the plurality of coil fixing members (351) as described above, a coil guide passage (357) is formed between the guide fingers (355) to fix a plurality of stator coils (7) along the layer direction.

[0081] Referring to FIGS. 5 and 6, the plurality of cam lobes (361) are configured to convert the rotational motion of the slot disk (331) into the linear motion of the plurality of coil fixing members (351) by means of the guide disk (341). The plurality of cam lobes (361) are also called cam followers.

[0082] Each of the above plurality of cam lobes (361) is fixed to each of the plurality of coil fixing members (351) and can be coupled to the slot disk (331) by passing through the guide disk (341) vertically.

[0083] Each of the plurality of cam lobes (361) is fixed in a fixing hole (352) provided in each of the plurality of coil fixing members (351) and extends downward. Each of these plurality of cam lobes (361) can penetrate vertically through each of the plurality of guide rail holes (345) of the guide disk (341) and each of the plurality of cam follower slots (333) of the slot disk (331) and be coupled to each of the plurality of cam follower rail grooves (325) of the support disk (321).

[0084] Referring to FIGS. 5 and 6, the actuator (371) is configured to generate a forward and backward operating force, convert the forward and backward operating force into rotational force, and transmit the rotational force to the slot disk (331). That is, the actuator (371) is configured to rotate the slot disk (331) in both directions (e.g., clockwise and counterclockwise) by a set angle.

[0085] The actuator (371) is installed on the base plate (111) of the base frame (110) and connected to the slot disk (331). This actuator (371) includes an operating cylinder (372), a rail block (374), a sliding block (376), and a fixing pin (378).

[0086] The above operating cylinder (372) may be equipped with a pneumatic or hydraulic cylinder well known to those skilled in the art. The above operating cylinder (372) is installed on a mounting block (373) mounted on a base plate (111).

[0087] Furthermore, the operating cylinder (372) is operatively connected to an extension (335) extending outward from the outer edge of the slot disk (331). The operating cylinder (372) includes an operating rod (375) that operates back and forth by pneumatic or hydraulic pressure.

[0088] The rail block (374) is fixed to the mounting block (373). The rail block (374) is positioned along the forward and backward movement direction of the operating rod (375). The sliding block (376) is connected to the operating rod (375) of the operating cylinder (372) and is slidably coupled to the rail block (374).

[0089] And, the above-mentioned fixed pin (378) is configured to operatively connect the sliding block (376), which is connected to the operating rod (375) of the operating cylinder (372), and the extension (335) of the slot disk (331).

[0090] The above fixing pin (378) is fixed to the upper surface of the sliding block (376) and extends upward from the upper surface. The above fixing pin (378) penetrates the extension (335) of the slot disk (331) in the vertical direction.

[0091] In FIGS. 5 and 6, the unexplained reference numeral 391 represents a cover that is fixed to the guide disk (341) and covers the upper surface of a plurality of coil fixing members (351).

[0092] Referring to FIGS. 2 to 4, in an embodiment of the present invention, the twisting tool unit (510) is configured to twist and form the welds (9) of a plurality of stator coils (7) while the plurality of stator coils (7) inserted into the stator core (3) are fixed by the coil fixing unit (310).

[0093] The twisting tool unit (510) is operatively connected to a tool drive unit (710), which will be further described later. The twisting tool unit (510) is installed so as to be movable up and down on the base plate (111) of the base frame (110) at the lower side of the coil fixing unit (310). The twisting tool unit (510) is positioned inside the disk hole (323) (see FIG. 7) of the support disk (321).

[0094] This twisting tool unit (510) is configured such that the welds (9) of the multiple stator coils (7) of two adjacent layers among the multiple layers of the multiple stator coils (7) are fitted, and the two layers are configured to be rotatable in different directions.

[0095] FIGS. 11 and 12 are combined perspective views illustrating a twisting tool unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention, and FIGS. 13 and 14 are exploded perspective views illustrating a twisting tool unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention.

[0096] Referring to FIGS. 2 to 4 and FIGS. 11 to 14, the twisting tool unit (510) according to an embodiment of the present invention includes a lifting member (511), an outer twisting jig (531), and an inner twisting jig (551).

[0097] The lifting member (511) is operatively connected to a tool drive unit (710), which will be further described later. The lifting member (511) is movably coupled in the vertical direction to a plurality of support rods (311) as mentioned above. In one example, the lifting member (511) is provided in the shape of a square plate, and a plurality of support rods (311) are coupled in the vertical direction to each corner of the lifting member (511).

[0098] The outer twisting jig (531) is operatively connected to a tool drive unit (710), which will be further described later, and is rotatably installed on a lifting member (511). The outer twisting jig (531) is rotatably installed on the lifting member (511) by means of a fixed ring (513) fixed to the upper surface of the lifting member (511) and a bushing ring (515) fixed to the fixed ring (513). Here, the outer twisting jig (531) is rotatably coupled to the bushing ring (515).

[0099] In the outer twisting jig (531), a plurality of first coil insertion grooves (533) are formed spaced apart along the circumferential direction. Among two adjacent layers of a plurality of stator coils (7), welds (9) of a plurality of stator coils (7) located radially outward can be inserted into the plurality of first coil insertion grooves (533). This outer twisting jig (531) includes a first jig body (535) and a first crown member (537).

[0100] The first jig body (535) is provided in a cylindrical shape and is rotatably coupled to the bushing ring (515). The first crown member (537) is coupled to the upper end of the first jig body (535). A plurality of first coil insertion grooves (533) are formed in the upper end of the first crown member (537).

[0101] The plurality of first coil insertion grooves (533) are spaced apart along the circumferential direction on the inner circumferential surface of the upper portion of the first crown member (537). The plurality of first coil insertion grooves (533) are formed along the vertical direction on the inner circumferential surface of the upper portion of the first crown member (537) and are connected to the upper portion of the first crown member (537).

[0102] The inner twisting jig (551) is operatively connected to a tool drive unit (710) which will be further described later. The inner twisting jig (551) is installed inside the outer twisting jig (531) so as to be rotatable in a direction opposite to the rotation direction of the outer twisting jig (531).

[0103] In the inner twisting jig (551), a plurality of second coil insertion grooves (553) are formed spaced apart along the circumferential direction. Among two adjacent layers of a plurality of stator coils (7), welds (9) of a plurality of stator coils (7) located radially inward can be inserted into the plurality of second coil insertion grooves (553). This inner twisting jig (551) includes a second jig body (555) and a second crown member (557).

[0104] The second jig body (555) is provided in a cylindrical shape. The second crown member (557) is coupled to the upper end of the second jig body (555). A plurality of second coil insertion grooves (553) are formed in the upper end of the second crown member (557).

[0105] The plurality of second coil insertion grooves (553) are spaced apart along the circumferential direction on the outer surface of the upper portion of the second crown member (557). The plurality of second coil insertion grooves (553) are formed along the vertical direction on the outer surface of the upper portion of the second crown member (557) and are connected to the upper portion of the second crown member (557).

[0106] Here, as illustrated in FIG. 15, the inner circumferential surface of the first crown member (537) and the outer circumferential surface of the second crown member (557) as described above are in contact with each other. And, each of the first coil insertion grooves (533) and each of the plurality of second coil insertion grooves (553) face each other.

[0107] Furthermore, the outer twisting jig (531) described above includes a first edge projection (539) formed on the first crown member (537). The first edge projection (539) is formed at each opening end of a plurality of first coil insertion grooves (533).

[0108] And, the inner twisting jig (551) as described above includes a second edge projection (559) formed on the second crown member (557). The second edge projection (559) is formed at each opening end of a plurality of second coil insertion grooves (553).

[0109] These first edge protrusions (539) and second edge protrusions (559) are configured to restrain the welds (9) of a plurality of stator coils (7) that are fitted into each of the plurality of first coil insertion grooves (533) and each of the plurality of second coil insertion grooves (553).

[0110] Meanwhile, the outer twisting jig (531) and the inner twisting jig (551) described above can be combined with each other so as to be moved in the up and down direction by the lifting member (511).

[0111] To this end, the twisting tool unit (510) further includes at least one cam follower (571) that is fixed to an outer twisting jig (531) as shown in FIG. 16 and is cam-contactably coupled to an inner twisting jig (551).

[0112] The above at least one cam follower (571) is fixed to the first jig body (535) of the outer twisting jig (531). The above at least one cam follower (571) is coupled to a cam slot (573) formed at an angle along the circumferential direction in the second jig body (555) of the inner twisting jig (551).

[0113] Accordingly, the outer twisting jig (531) described above can be moved up and down by a cam follower (571) by a set angle of inclination of at least one cam slot (573). Here, the outer twisting jig (531) is supported so as to be movable up and down by the bushing ring (515) mentioned above (see FIG. 11).

[0114] Referring to FIGS. 2 to 4, in an embodiment of the present invention, the tool driving unit (710) is configured to operate the twisting tool unit (510). The tool driving unit (710) is installed on the base frame (110) and is operatively connected to the twisting tool unit (510).

[0115] The tool drive unit (710) is operatively connected to each of the outer twisting jig (531) and the inner twisting jig (551) of the tool drive unit (710) as shown in FIG. 11, and can rotate the outer twisting jig (531) and the inner twisting jig (551) in opposite directions.

[0116] Additionally, the tool drive unit (710) is operatively connected to the lifting member (511) of the twisting tool unit (510) as shown in FIG. 11, and can move the lifting member (511) in an up-and-down direction.

[0117] FIGS. 17 to 19 are drawings illustrating a tool driving unit applied to a twisting device of a hairpin-type stator coil according to an embodiment of the present invention.

[0118] Referring to FIGS. 2 to 4 and FIGS. 17 to 19, the tool driving unit (710) according to an embodiment of the present invention includes a housing (711), a first jig operating part (731), a second jig operating part (751), and a lift driving part (771).

[0119] The above housing (711) is a cylindrical housing with an open top corresponding to the twisting tool unit (510) and a closed bottom corresponding to the top. The above housing (711) is fixed to the base plate (111) of the base frame (110) through the top portion.

[0120] The first jig operating part (731) is operatively connected to the outer twisting jig (531). The first jig operating part (731) includes an outer shaft (733), a first key adapter (735), a first servo motor (737), and a first power transmission mechanism (739).

[0121] The outer shaft (733) is rotatably installed inside the housing (711) and is operatively connected to the outer twisting jig (531). In one example, the outer shaft (733) is provided in a cylindrical shape and is rotatably supported on the inner circumference of the housing (711) through a bearing (734).

[0122] The first key adapter (735) is fixed to the upper end of the outer shaft (733) and is key-coupled to the outer twisting jig (531) along the vertical direction. In one example, the first key adapter (735) is provided in a ring shape.

[0123] The first key adapter (735) includes at least one first key (738) that is coupled to at least one first key groove (736) formed at the lower end of the first jig body (535) of the outer twisting jig (531).

[0124] The first servo motor (737) is a motor capable of servo control of rotational speed and direction, and is installed in the housing (711).

[0125] The first power transmission mechanism (739) is configured to transmit rotational power of the first servo motor (737) to the outer twisting jig (531). The first power transmission mechanism (739) includes a first driving pulley (741), a first driven pulley (743), and a first belt (745).

[0126] The first drive pulley (741) is connected to the output shaft of the first servo motor (737). The first driven pulley (743) is connected to the lower end of the outer shaft (733). And, the first belt (745) connects the first drive pulley (741) and the first driven pulley (743).

[0127] The second jig operating part (751) is operatively connected to the inner twisting jig (551). The second jig operating part (751) includes an inner shaft (753), a second key adapter (755), a second servo motor (757), and a second power transmission mechanism (759).

[0128] The inner shaft (753) is rotatably installed on the inner side of the outer shaft (733) and is operatively connected to the inner twisting jig (551). In one example, the inner shaft (753) is provided in a cylindrical shape and is rotatably supported on the inner circumference of the outer shaft (733) through a bearing (not shown).

[0129] The second key adapter (755) is fixed to the upper end of the inner shaft (753) inside the first key adapter (735) and is key-coupled to the inner twisting jig (551) along the vertical direction. In one example, the second key adapter (755) is provided in the shape of a circular block.

[0130] The second key adapter (755) includes at least one second key (758) that is coupled to at least one second key groove (756) formed at the lower end of the second jig body (555) of the inner twisting jig (551).

[0131] The second servo motor (757) is a motor capable of servo control of rotational speed and direction, and is installed in the housing (711).

[0132] The second power transmission mechanism (759) is configured to transmit rotational power of the second servo motor (757) to the inner twisting jig (551). The second power transmission mechanism (759) includes a second driving pulley (761), a second driven pulley (763), and a second belt (765).

[0133] The second drive pulley (761) is connected to the output shaft of the second servo motor (757). The second driven pulley (763) is connected to the lower end of the inner shaft (753). The second belt (765) connects the second drive pulley (761) and the second driven pulley (763).

[0134] The lift drive unit (771) is installed in the housing (711) and is operatively connected to the lifting member (511). This lift drive unit (771) includes a third servo motor (773) and a nut block (775).

[0135] The third servo motor (773) is a motor capable of servo control of rotational speed and direction and is installed in the housing (711). The nut block (775) is fixed to the lifting member (511) and is screw-coupled to the motor shaft (774) of the third servo motor (773) along the vertical direction.

[0136] Hereinafter, the operation and function of the twisting device (100) of a hairpin-type stator coil according to an embodiment of the present invention configured as above will be explained in detail with reference to FIGS. 1 to 19.

[0137] First, in an embodiment of the present invention, the core gripper (101) grips a stator core (3) in which a plurality of stator coils (7) are inserted in a plurality of layers into a plurality of slots (5) and transports it to a set position. At this time, the stator core (3) may be positioned above the coil fixing unit (310).

[0138] Here, the plurality of coil fixing members (351) of the coil fixing unit (310) are in a state of being moved backward radially along the plurality of guide rails (343) of the guide disk (341) by the driving of the actuator (371). At this time, the operating cylinder (372) of the actuator (371) is in a state of having moved the operating rod (375) forward, and accordingly, the slot disk (331) is in a state of being rotated in one direction.

[0139] And, the outer twisting jig (531) of the twisting tool unit (510) is coupled to the cam slot (573) of the inner twisting jig (551) through at least one cam follower (571).

[0140] Furthermore, the lifting member (511) of the twisting tool unit (510) is moved downward together with the outer twisting jig (531) and the inner twisting jig (551) by the drive of the lift drive unit (771) of the tool drive unit (710).

[0141] Furthermore, each of the plurality of first coil insertion grooves (533) of the outer twisting jig (531) and each of the plurality of second coil insertion grooves (553) of the inner twisting jig (551) face each other while the inner surface of the first crown member (537) and the outer surface of the second crown member (557) are in contact with each other.

[0142] In this state, the stator core (3) is moved downward by the core gripper (101) which moves by the robot motion of the robot (103).

[0143] Then, among the multiple layers of the plurality of stator coils (7), the welds (9) of the multiple stator coils (7) of two adjacent layers are inserted into the multiple first coil insertion grooves (533) and the multiple second coil insertion grooves (553) layer by layer.

[0144] In one example, among the two layers, the welds (9) of a plurality of stator coils (7) of one layer located radially outside the stator core (3) are inserted into each of the plurality of first coil insertion grooves (533) of the outer twisting jig (531). Then, among the two layers, the welds (9) of a plurality of stator coils (7) of the other layer located radially inside the stator core (3) are inserted into each of the plurality of second coil insertion grooves (553) of the inner twisting jig (551).

[0145] Next, the operating cylinder (372) of the actuator (371) moves the operating rod (375) backward. Accordingly, the sliding block (376) connected to the operating rod (375) moves backward along the rail block (374). Then, because the fixing pin (378) fixed to the sliding block (376) penetrates vertically through the extension (335) of the slot disk (331), the slot disk (331) rotates by a set angle in the other direction.

[0146] As described above, when the slot disk (331) rotates in the other direction, the plurality of coil fixing members (351) move radially forward along the plurality of guide rails (343) of the guide disk (341) by means of the plurality of cam lobes (361).

[0147] Here, the plurality of cam lobes (361) can slide along the plurality of cam follower slots (333) of the slot disk (331) and the plurality of cam follower rail grooves (325) of the support disk (321) through the plurality of guide rail holes (345) of the guide disk (341), and can advance the plurality of coil fixing members (351).

[0148] Accordingly, the plurality of coil fixing members (351) fix the plurality of stator coils (7) along the layer direction through the coil guide passage (357) between the guide fingers (355).

[0149] Then, the first servo motor (737) of the first jig operating part (731) of the tool drive unit (710) is driven, and the rotational power of the first servo motor (737) is transmitted to the outer shaft (733) through the first power transmission mechanism (739). Accordingly, the outer shaft (733) rotates in one direction.

[0150] Here, the first key adapter (735) of the first jig operating part (731) is fixed to the upper end of the outer shaft (733). And, at least one first key (738) of the first key adapter (735) is coupled along the vertical direction to at least one first key groove (736) of the outer twisting jig (531).

[0151] Accordingly, when the outer shaft (733) rotates in one direction, the outer twisting jig (531) rotates in one direction by means of the first key adapter (735).

[0152] During this process, the second servo motor (757) of the second jig operating part (751) of the tool drive unit (710) is driven, and the rotational power of the second servo motor (757) is transmitted to the inner shaft (753) through the second power transmission mechanism (759). Accordingly, the inner shaft (753) rotates in the opposite direction to the rotational direction of the outer shaft (733).

[0153] Here, the second key adapter (755) of the second jig operating part (751) is fixed to the upper end of the inner shaft (753). And, at least one second key (758) of the second key adapter (755) is coupled along the vertical direction to at least one second key groove (756) of the inner twisting jig (551).

[0154] Accordingly, when the inner shaft (753) rotates in the other direction, the inner twisting jig (551) rotates in the other direction by the second key adapter (755).

[0155] Thus, with the welds (9) of the plurality of stator coils (7) inserted into the plurality of first coil insertion grooves (533) and the plurality of second coil insertion grooves (553) respectively in two layers, the outer twisting jig (531) and the inner twisting jig (551) rotate in opposite directions to each other, and the welds (9) of the plurality of stator coils (7) are twisted and formed.

[0156] In the process of twisting and forming the welded portions (9) of the plurality of stator coils (7) as described above, the welded portions (9) of the plurality of stator coils (7) inserted into the plurality of first coil insertion grooves (533) and the plurality of second coil insertion grooves (553) are raised.

[0157] Accordingly, the third servo motor (773) of the lift drive unit (771) is driven, and the lifting member (511) is moved upward through the nut block (775). Then, the outer twisting jig (531) and the inner twisting jig (551) move upward together with the lifting member (511).

[0158] Accordingly, the outer twisting jig (531) and the inner twisting jig (551) are moved in an upward direction to correct the fixed position of the welds (9) and to twist the welds (9).

[0159] Furthermore, in the process of twisting and forming the welds (9) as described above, the outer twisting jig (531) is moved upward by a set angle of inclination of at least one cam slot (573) by a cam follower (571) coupled to at least one cam slot (573) of the inner twisting jig (551).

[0160] The reason for moving the outer twisting jig (531) in the upward direction in this manner is that the distance from the center of the outer twisting jig (531) to the welds (9) inserted into the plurality of first coil insertion grooves (533) is greater than the distance from the center of the inner twisting jig (551) to the welds (9) inserted into the plurality of second coil insertion grooves (553).

[0161] Accordingly, the outer twisting jig (531) moves to a position higher than the height of the inner twisting jig (551) and can correct the fixed position of the welds (9) inserted into the plurality of first coil insertion grooves (533).

[0162] Meanwhile, after the welds (9) of the multiple stator coils (7) of the two layers are twisted and formed through the process described above, the outer twisting jig (531) and the inner twisting jig (551) return to their original positions by the operation of the tool drive unit (710).

[0163] Then, the plurality of coil fixing members (351) are moved radially forward along the plurality of guide rails (343) of the guide disk (341) by driving the actuator (371).

[0164] Finally, the core gripper (101) moves the stator core (3) upward by the robot movement of the robot (103) and transfers the stator core (3) to a subsequent process, the coil welding process.

[0165] On the other hand, among the multiple layers of multiple stator coils (7), the welds (9) of the remaining layers, excluding the two layers for which twisting molding has been completed, can be twisted molded through the twisting device (100) of the hairpin type stator coil according to an embodiment of the present invention.

[0166] The twisting device (100) of a hairpin-type stator coil according to an embodiment of the present invention as described so far can twist and form the welded portions (9) of a plurality of stator coils (7) of two layers among a plurality of layers.

[0167] In one example, the twisting devices (100) of the hairpin type stator coil according to an embodiment of the present invention are arranged in series to twist and form the welds (9) of the plurality of stator coils (7) of two layers among the plurality of layers.

[0168] Thus, the twisting device (100) of the hairpin type stator coil according to the embodiment of the present invention has a simple structure, unlike the complex structure that twists and forms the welds (9) of the plurality of stator coils (7) of the plurality of layers.

[0169] Accordingly, the twisting device (100) of the hairpin type stator coil according to the embodiment of the present invention can lower the unit cost of the equipment, is advantageous in terms of maintenance, and allows for convenient replacement of the tool when changing the stator model.

[0170] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and includes all modifications within the scope recognized as equivalent that can be easily made by those skilled in the art from the embodiments of the present invention. Explanation of the symbols

[0171] 1: Stator 3: Stator core 5: Slot 7: Stator coil 9: Welded part 100: Twisting device for hairpin-type stator coils 101: Core Gripper 103: Robot 105: Robot Arm 110: Base Frame 111: Base plate 113: Support 310: Coil fixing unit 311: Support rod 321: Support disc 323: Disc hole 325: Cam follower rail groove 331: Slot disc 333: Cam follower slot 335: Extension 341: Guide disc 343: Guide rail 345: Guide rail hole 351: Coil fixing member 353: Guide Arm 355: Guide Finger 357: Guide Passage 361: Cam Robe 371: Actuator 372: Actuating cylinder 373: Mounting block 374: Rail block 375: Operating rod 376: Sliding block 378: Fixing pin 510: Twisting tool unit 511: Lifting member 513: Fixing ring 515: Bush Ring 531: Outer Twisting Jig 533: First coil insertion groove 535: First jig body 537: First crown member 539: First edge projection 551: Inner twisting jig 553: Second coil insertion groove 555: Second jig body 557: Second crown member 559: Second edge protrusion 571: Cam follower 573: Cam slot 710: Tool drive unit 711: Housing 731: First jig operating part 733: Outer shaft 734: Bearing 735: 1st Key Adapter 736: 1st Key Home 737: 1st servo motor 738: 1st key 739: First power transmission mechanism 741: First drive pulley 743: 1st driven pulley 745: 1st belt 751: Second jig operating part 753: Inner shaft 755: Second key adapter 756: Second key home 757: 2nd servo motor 758: 2nd key 759: Second power transmission mechanism 761: Second drive pulley 763: Second driven pulley 765: Second belt 771: Lift drive unit 773: Third servo motor 775: Nut Block

Claims

Claim 1 A twisting device for a hairpin-type stator coil configured to twist and mold a plurality of hairpin-type stator coils inserted in a plurality of layers into a stator core, comprising: a base frame; a coil fixing unit installed on the base frame via a plurality of support rods; a twisting tool unit installed on the base frame so as to be movable up and down on the lower side of the coil fixing unit, wherein a plurality of stator coils of two adjacent layers among the plurality of layers are fitted therein and are rotatably provided for each of the two layers; and a tool driving unit installed on the base frame and operatively connected to the twisting tool unit; wherein the coil fixing unit comprises a plurality of coil fixing members operatively connected to an actuator installed on the base frame and configured to be radially reciprocatingly moved by the actuator. Claim 2 delete Claim 3 A twisting device for a hairpin-type stator coil according to claim 1, wherein the coil fixing unit comprises a coil guide passage formed between the plurality of coil fixing members to fix the plurality of stator coils along the layer direction. Claim 4 A twisting device for a hairpin-type stator coil configured to twist and mold multiple hairpin-type stator coils inserted in multiple layers into a stator core, comprising: a base frame; a coil fixing unit installed on the base frame via multiple support rods; a twisting tool unit fitted with multiple stator coils of two adjacent layers among the multiple layers, rotatably configured for each of the two layers, and installed to be movable up and down on the base frame below the coil fixing unit; A twisting device for a hairpin type stator coil comprising: a tool driving unit installed on the base frame and operatively connected to the twisting tool unit; wherein the coil fixing unit comprises a support disk positioned between the upper surface of the base frame and the twisting tool unit through a plurality of support rods, a slot disk rotatably coupled to the support disk, a guide disk fixed to the support disk with the slot disk positioned below, a plurality of coil fixing members radially slidably coupled to the guide disk, a plurality of cam lobes fixed to the plurality of coil fixing members and coupled to the slot disk by penetrating the guide disk, and an actuator installed on the base frame and connected to the slot disk. Claim 5 A twisting device for a hairpin type stator coil according to claim 4, wherein the support disk includes a plurality of cam follower rail grooves formed radially on its upper surface, the slot disk includes a plurality of cam follower slots formed in a cyclone shape, and the guide disk includes a plurality of guide rails formed radially on its upper surface and a plurality of guide rail holes formed between the plurality of guide rails. Claim 6 In claim 5, the plurality of cam lobes are a twisting device for a hairpin-type stator coil that penetrates the plurality of guide rail holes and the plurality of cam follower slots vertically and is coupled to the plurality of cam follower rail grooves. Claim 7 A twisting device for a hairpin-type stator coil according to claim 4, wherein the actuator comprises: an operating cylinder installed on a mounting block mounted on the base frame and operatively connected to an extension extending outwardly from the edge of the slot disk; a rail block fixed to the mounting block; a sliding block connected to the operating rod of the operating cylinder and slidably coupled to the rail block; and a fixing pin fixed to the sliding block and penetrating the extension vertically. Claim 8 A twisting device for a hairpin-type stator coil according to claim 4, wherein each of the plurality of coil fixing members comprises a guide arm slidably coupled to the plurality of guide rails and a guide finger integrally connected to the guide arm to fix the plurality of stator coils along the layer direction. Claim 9 A twisting device for a hairpin-type stator coil configured to twist and mold multiple hairpin-type stator coils inserted in multiple layers into a stator core, comprising: a base frame; a coil fixing unit installed on the base frame via multiple support rods; a twisting tool unit fitted with multiple stator coils of two adjacent layers among the multiple layers, rotatably configured for each of the two layers, and installed to be movable up and down on the base frame below the coil fixing unit; A twisting device for a hairpin-type stator coil, comprising: a tool drive unit installed on the base frame and operatively connected to the twisting tool unit; wherein the twisting tool unit comprises a lifting member movably coupled to the plurality of support rods in an up-and-down direction; a cylindrical outer twisting jig rotatably coupled to the lifting member and having a plurality of first coil insertion grooves formed spaced apart along the circumferential direction; and a cylindrical inner twisting jig rotatably installed on the inner side of the outer twisting jig in a direction opposite to the rotation direction of the outer twisting jig and having a plurality of second coil insertion grooves formed spaced apart along the circumferential direction. Claim 10 In claim 9, the outer twisting jig and the inner twisting jig are mutually coupled to move in the up and down direction by the lifting member, forming a twisting device for a hairpin-type stator coil. Claim 11 A twisting device for a hairpin-type stator coil according to claim 9, wherein the twisting tool unit further comprises a cam follower that is fixed to the outer twisting jig and coupled to at least one cam slot formed inclined along the circumferential direction in the inner twisting jig. Claim 12 In claim 11, the outer twisting jig is a twisting device for a hairpin-type stator coil that is moved up and down by the cam follower by a set angle of inclination of at least one cam slot. Claim 13 In claim 9, the outer twisting jig comprises a first crown member having a plurality of first coil insertion grooves formed along the vertical direction on an inner surface, and the inner twisting jig comprises a second crown member having a plurality of second coil insertion holes formed along the vertical direction on an outer surface, wherein the inner surface of the first crown member and the outer surface of the second crown member are in contact with each other, and each of the plurality of first coil insertion grooves and each of the plurality of second coil insertion holes face each other, forming a twisting device for a hairpin-type stator coil. Claim 14 A twisting device for a hairpin-type stator coil according to claim 9, wherein the outer twisting jig includes a first edge projection formed at the opening end of the plurality of first coil insertion grooves, and the inner twisting jig includes a second edge projection formed at the opening end of the plurality of second coil insertion holes. Claim 15 A twisting device for a hairpin type stator coil according to claim 9, wherein the tool drive unit comprises a housing fixed to the base frame, an outer shaft rotatably installed inside the housing, a first jig operating part operably connected to the outer twisting jig through the outer shaft, and a second jig operating part operably connected to the inner twisting jig through the inner shaft, an inner shaft rotatably installed inside the outer shaft. Claim 16 In claim 15, the tool drive unit further comprises a lift drive unit installed in the housing and connected to the lifting member, a twisting device of a hairpin type stator coil. Claim 17 A twisting device for a hairpin-type stator coil according to claim 15, wherein the first jig operating part comprises a first key adapter fixed to the upper end of the outer shaft and key-coupled with the outer twisting jig, a first servo motor installed in the housing, a first drive pulley connected to the first servo motor, a first driven pulley connected to the outer shaft, and a first belt connecting the first drive pulley and the second driven pulley. Claim 18 A twisting device for a hairpin type stator coil according to claim 17, wherein the second jig operating part comprises a second key adapter fixed to the upper end of the inner shaft and key-coupled with the inner twisting jig, a second servo motor installed in the housing, a second drive pulley connected to the second servo motor, a second driven pulley connected to the inner shaft, and a second belt connecting the second drive pulley and the second driven pulley. Claim 19 A twisting device for a hairpin type stator coil according to claim 18, wherein the first key adapter comprises at least one first key coupled to at least one first key groove formed at the lower end of the outer twisting jig, and the second key adapter comprises at least one second key coupled to at least one second key groove formed at the lower end of the inner twisting jig. Claim 20 In claim 16, the lift drive unit comprises a third servo motor installed in the housing and a hairpin-type stator coil twisting device including a nut block fixed to the lifting member and screw-coupled to the motor shaft of the third servo motor.

Images