Patent ID: 12244186

DETAILED DESCRIPTION

Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings for those skilled in the art to which the present disclosure pertains to easily practice the present disclosure. However, the present disclosure may be modified in various different forms, and is not limited to an embodiment provided in this specification.

A portion unrelated to the description is omitted to obviously describe the present disclosure, and the same or similar components are denoted by the same reference numeral throughout the specification.

The size and thickness of each component shown in the accompanying drawings are arbitrarily shown for convenience of explanation, and therefore, the present disclosure is not necessarily limited to contents shown in the accompanying drawings, and the thicknesses are exaggerated in the drawings to clearly represent several portions and regions.

In the following detailed description, terms ‘first’, ‘second’ and the like, are used to distinguish components having the same names from each other, and are not necessarily limited to a sequence thereof.

Throughout the specification, unless explicitly described to the contrary, ‘comprising’ any components will be understood to imply the inclusion of another element rather than the exclusion of any other element.

FIG.1is a view schematically showing a structure of a stator of a hairpin winding motor applied to a hairpin twisting device of a hairpin winding motor according to an embodiment of the present disclosure.

Referring toFIG.1, a stator1of the hairpin winding motor applied to an embodiment of the present disclosure may be applied to a driving motor for a hybrid vehicle or an electric vehicle which may obtains driving power by using electric energy as an eco-friendly vehicle.

The driving motor may include a rotor (not shown) spaced apart from the stator1by a predetermined gap, and a plurality of permanent magnets (not shown) installed in the rotor.

The stator1may include a stator core3in which a plurality of electrical steel sheets are stacked on each other.

The stator core may include a plurality of slots positioned through the stator core in a circumferential direction and including a plurality of layers (indicated by a dashed-dotted line inFIG.1) positioned in the slot in a radial direction.

The stator core3may have hairpins10wound in a plurality of slots5.

The hairpin10may be made of a square coil, and include a pair of leg portions13on both sides thereof with respect to a head portion11.

The hairpin10may be generally U-shaped or V-shaped, and may be the square coil having a square cross section.

These hairpins10may be inserted into the predetermined layers (indicated by the dashed-dotted line inFIG.1) of the slot5of the stator core3.

A de-coated portion15positioned at each end of the pair of leg portions13may protrude outward the slot5in a state where the hairpins10is inserted into the stator core3.

The hairpins10may form a winding electrically connected to each other by welding-bonding of the de-coated portion15.

Although an embodiment of the present disclosure has been described hereinabove as being applied to the stator1of the hairpin winding motor employed in the eco-friendly vehicle, it should not be understood that the scope of the present disclosure is necessarily limited thereto, and any motor with the hairpin10of various types and usages may be applied to the spirit of the present disclosure.

The hairpin twisting device of a hairpin winding motor according to an embodiment of the present disclosure may be applied to twist the plurality of hairpins inserted into the above-described stator core and mount the same therein.

FIG.2is a view showing a configuration of the hairpin twisting device of a hairpin winding motor according to an embodiment of the present disclosure;FIG.3is a view showing a configuration of a twisting module applied to the hairpin twisting device of a hairpin winding motor according to an embodiment of the present disclosure;FIG.4is a cross-sectional view taken along line A-A ofFIG.3; andFIG.5is a cross-sectional view taken along line B-B ofFIG.3.

Referring toFIG.2, a hairpin twisting device20of a hairpin winding motor according to an embodiment of the present disclosure may roughly include a fixing jig30and a twisting module40.

The stator core3may be seated on the fixing jig30.

Accordingly, the fixing jig30may include a seating portion31seating the stator core3thereon.

The seating portion31may be stepped from an upper surface of the fixing jig30.

A plurality of through holes33may be positioned in the seating portion31. The plurality of through holes33may each be formed through to correspond to the hairpin10. That is, the stator core3may be seated on the seating portion31, and the hairpins10may respectively be inserted into the plurality of through holes33.

The twisting module40may be positioned under the fixing jig30.

Referring toFIGS.3to5, the twisting module40may be rotated in a predetermined direction to twist the hairpins10while clamping the respective end portions of the plurality of hairpins10inserted into the plurality of slots5.

The twisting module40may include a plurality of ring gears41, a plurality of planetary gears45and a driving gear47.

The plurality of ring gears41may respectively correspond to the plurality of layers.

The plurality of ring gears41may each have a twisting jig43positioned thereon for the hairpin10corresponding to each layer to be inserted thereto.

The twisting jig43may have a lower portion connected to the ring gear41, and a hairpin groove430positioned in an upper surface of the twisting jig for the hairpin10is inserted thereto.

Accordingly, the twisting jigs43may have upper portions gathered to each other to correspond to positions of the hairpins10inserted into the stator core3.

Here, the hairpin groove430may be a groove having a square cross section. That is, the hairpin groove430may have a shape corresponding to the shape of the hairpin10.

In addition, each of the ring gears41may have gear teeth positioned on each of the outer and inner peripheries thereof.

The outer gear teeth410and inner gear teeth411of the ring gear41may be different from each other.

The gear teeth may have the shapes different from each other for the plurality of ring gears41having different diameters to be operated in a forward or backward direction while having all the same angle.

The number of ring gears41may depend on the number of the layers. That is, the number of the ring gears41may be determined based on the number of layers positioned in the slot5of the stator core3.

In addition, the plurality of planetary gears45may be disposed between the plurality of ring gears41.

The planetary gears45may each have an inner gear451corresponding to the outer gear teeth410of the ring gear41and an outer gear450corresponding to the inner gear teeth411of the ring gear41, which are coupled to each other.

In the planetary gear45, the inner gear451and the outer gear450may be different parts and coupled to each other, or the inner gear451and the outer gear450may be one part and respectively positioned therein.

The plurality of planetary gears45may be radially arranged at regular intervals.

As an example of the plurality of planetary gears45, five planetary gears45may be positioned radially between the ring gears41.

The description describes an example of the plurality of planetary gears45according to an embodiment of the present disclosure as five planetary gears45positioned between the ring gears41. However, the number of the planetary gears is not necessarily limited thereto, and may be changed and applied as needed.

Meanwhile, the driving gear47may be externally meshed with an outermost ring gear41. The driving gear47may operate the ring gears41.

The outermost ring gear41externally meshed with the driving gear47may have the outer gear teeth410corresponding to gear teeth of the driving gear47.

The twisting module40configured as described above may be cross-operated in the forward and backward directions in an order of the ring gears41arranged from the outside to the center of the twisting module by the operation of the driving gear47.

Here, the forward direction may be defined as a clockwise direction, and the backward direction may be defined as a counterclockwise direction.

That is, when the outermost ring gear41externally meshed with the driving gear47is operated in the backward direction, the ring gear41positioned there inside may be operated in the forward direction, and another ring gear41positioned there inside may be operated in the backward direction.

Here, the ring gears41may be operated as described above by the planetary gears45. Furthermore, the plurality of ring gears41may respectively have the same rotation angle. For example, the rotation angle of the ring gear41may be set in a range of 20° or more and 30° or less.

The twisting module40may be mounted on a jig base50by means of a bearing51.

The jig base50may have both end portions each mounted on a frame53which is positioned under the fixing jig30, to slide up and down.

Accordingly, the twisting module40may determine a position of the jig base50based on the specification of the stator core3seated on the fixing jig30.

Accordingly, the hairpin twisting device20of a hairpin winding motor according to an embodiment of the present disclosure may have the improved productivity by easily performing the twisting process of the hairpin10, which is essentially applied to the manufacture of the motor for winding the square-type hairpin10.

Further, the hairpin twisting device20of a hairpin winding motor may have the improved production speed by twisting the hairpins10at once.

In addition, the hairpin twisting device20of a hairpin winding motor according to an embodiment of the present disclosure may be generally used because the device may be applied to a stator core3of any specification, and may thus require lower investment cost.

Although the present disclosure has been described hereinabove with reference to an embodiment, those skilled in the art needs to understand that various modifications and alterations to the present disclosure may be made without departing from the spirit and scope of the present disclosure as defined in the following claims.