KR102662995B1 - Mold apparatus for forming HEV motor core bobbin - Google Patents

Abstract

The present invention relates to a mold device for forming bobbins for mass production of split cores of HEV motors: based on a mold member 30 that accommodates a split core 12 of a laminated structure between an upper mold 31 and a lower mold 32. The mold member 30 includes a support member 40 that elastically supports the split core 12 with a plurality of slide cores 41; An auxiliary member 50 supporting the insulating sheet 27 attached to the split core 12 with a plurality of slide cores 51; It is characterized by including a gate 35 for forming the bobbin 20 by injecting molten resin into the cavity around the split core 12.
Accordingly, in the process of mass producing the split core of the motor stator for HEV mounting, the quality and productivity are improved by accurately and quickly injection molding the bobbin even if the alignment of the laminated steel sheets is uneven.

Description

Mold apparatus for forming HEV motor core bobbin}

The present invention relates to a mold device for bobbins of motors, and more specifically, to a mold device for bobbins of HEV motors for application in the field of mass production of split cores of motor stators mounted on hybrid vehicles.

As global fossil fuel regulations are strengthened, continued development of electric vehicles, including hybrid vehicles (HEV), is expected. The P2 type hybrid is the most widely applied because it can be driven in motor/generator mode without making significant changes to the existing vehicle structure. The HEV motor stator has a structure in which a coil is wrapped around the outer surface of a laminated electrical steel core with an insulating bobbin interposed. In mass production, a method of inserting a laminated core into an injection mold and adding molten resin to form a bobbin is applied.

In this regard, Korean Patent Publication No. 1558777 (Priority Document 1) and Korean Patent Registration No. 2164825 (Priority Document 2) are known as prior art documents that can be referred to.

Prior document 1 includes an upper core and a lower core disposed between the rotor core, a slide core disposed on the side, a lift core disposed at the bottom of the rotor core around the lower core to press the rotor core, and a lift core that moves up and down. It includes a hydraulic slide mechanism that moves it. Accordingly, bond core molding is possible and the effect of improving the amount of deformation of the core after molding is expected.

However, since this is a mold device for rotor molding to fix a magnet, it has limitations in application to the laminated core, which is the stator iron core.

Prior document 2 prepares a core material having an approximately H-shaped cross section, installs the insulating sheet in the groove of the core material so that it is accommodated in the groove of the core material, arranges the insulating sheet and the core material in the cavity of the mold, and places the insulating sheet in the cavity. It includes a process of injecting resin to form a roughly H-shaped resin molded body. Accordingly, a bobbin that can withstand the high efficiency and large output of the motor generator is expected.

However, there is room for improvement due to insufficient response to situations where the alignment of the laminated steel plates forming the stator iron core is uneven.

Korean Patent Publication No. 1558777 “Mold device for motor rotor molding” (Publication date: 2015.10.07.) Korean Patent Publication No. 2164825 “Motor bobbin and manufacturing method thereof” (Publication date: 2016.05.04.)

The purpose of the present invention to improve the above-described conventional problems is to provide a HEV motor that can accurately and quickly injection mold the bobbin even if the alignment of the laminated steel plates is uneven during the process of mass producing the split core of the motor stator for HEV mounting. To provide a mold device for forming bobbins.

In order to achieve the above object, the present invention is a mold device for forming bobbins for mass production of split cores of HEV motors: it is based on a mold member that accommodates a split core of a laminated structure between an upper mold and a lower mold, and the mold The member includes a support member that elastically supports the split core with a plurality of slide cores; An auxiliary member supporting the insulating sheet attached to the split core with a plurality of slide cores; A gate for forming a bobbin by injecting molten resin into a cavity around the split core.

As a detailed configuration of the present invention, the cavity of the mold member is characterized in that it is formed to allow alignment deviation of multiple electrical steel sheets laminated on the split core to a tolerance of up to 0.5 mm.

As a detailed configuration of the present invention, the mold member is characterized in that it forms a bobbin in a structure in which the inner end and the outer end are connected by support parts on one side and the other side.

As a detailed configuration of the present invention, the support member is characterized by maintaining a set elastic force by arranging a plurality of disk springs in parallel and series.

As a detailed configuration of the present invention, the elastic force generated by the dish spring is set to correspond to an injection pressure in the range of 400 to 420 kgf.

As a detailed configuration of the present invention, the mold member is characterized by maintaining adhesion to the edge of the insulating sheet with the molten resin of the bobbin.

As a detailed configuration of the present invention, the auxiliary member is characterized in that the distance at which the insulating sheet is pressed by the slide core is maintained within 0.1 mm.

As described above, according to the present invention, quality and productivity are improved by accurately and quickly injection molding the bobbin even if the alignment of the laminated steel sheets is uneven during the process of mass producing the split core of the motor stator for HEV mounting.

Figure 1 is an example diagram showing the split core of the stator iron core of an HEV motor
Figure 2 is a configuration diagram showing a mold device and split core according to the present invention.
Figure 3 is a configuration diagram showing the main parts of the mold device according to the present invention
Figure 4 is a schematic diagram showing the support member of the mold device according to the present invention.
Figure 5 is a schematic diagram showing the operating state of the mold device according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail based on the attached drawings.

The present invention proposes a mold device for forming bobbins for mass production of split cores of HEV motors. The target is a mold device that mass-produces the split core of the motor stator mounted on a hybrid vehicle, but it is not necessarily limited to this.

Referring to FIG. 1, one of the plurality of split cores 12 forming the stator 10 of the HEV motor is shown separated. The split core 12 narrowly refers to a laminated core made by stacking and joining a plurality of electrical steel sheets (for example, 232 sheets), but in a broad sense, it refers to a laminated core with a bobbin 20 and an insulating sheet 27 attached to the outer surface of the laminated core. In addition, it may mean a state in which a coil (not shown) is wound.

According to the present invention, it is based on a mold member 30 that accommodates a split core 12 of a laminated structure between the upper mold 31 and the lower mold 32.

Referring to Figures 1 and 2, a split core 12 and a mold member 30 for mass production thereof appear. The split core 12 has an inner end 14, which can be called a pawl, at one end of the tooth, which is a coil winding area, and an outer end 16, which can be called a yoke, at the other end of the tooth. The outer end 16 may be provided with uneven portions 18 so as to be closely engaged with each other. The mold member 30 has a cavity for forming the bobbin 20 with the split core 12 inserted between the upper mold 31 and the lower mold 32.

According to the present invention, the mold member 30 includes a support member 40 that elastically supports the split core 12 with a plurality of slide cores 41; An auxiliary member 50 supporting the insulating sheet 27 attached to the split core 12 with a plurality of slide cores 51; It is characterized by including a gate 35 for forming the bobbin 20 by injecting molten resin into the cavity around the split core 12.

Referring to Figures 2 and 3, a support member 40, an auxiliary member 50, a gate 35, etc. are provided on a mold member 30 equipped with an upper mold 31 and a lower mold 32. The slide core 41 constituting the support member 40 elastically supports the inner end 14 and the outer end 16 of the split core 12 during the injection process. The slide core 51 constituting the auxiliary member 50 supports the insulating sheet 27 during the injection process. Before and after injection, the slide cores 41 and 51 move through the movable blocks 47 and 57 and angular pins (not shown). The movement of the slide cores 41 and 51 is linked to the coupling and separation of the upper mold 31 and the lower mold 32. The gate 35 is shown to be connected to the inner end 14 of the split core 12, but is not limited to this and may be connected to a plurality of positions. During the injection process, the cavity of the mold member 30 flows molten resin to the outer surface of the split core 12 to form the bobbin 20.

Meanwhile, the slide core 41 of the mold member 30 is connected to the shoulder bolt 43 and maintains the set position. The position of the slide core (41) changes depending on the degree to which the shoulder bolt (43) is loosened or tightened.

As a detailed configuration of the present invention, the cavity of the mold member 30 is characterized in that it is formed to allow alignment deviation of multiple electrical steel sheets stacked on the split core 12 up to a tolerance of 0.5 mm.

A plurality of electrical steel sheets constituting the split core 12 are joined as one piece using a jig, but in general, at least one electrical steel sheet has a deviation that causes it to be out of alignment. If the alignment deviation exceeds the set value, it reduces the fluidity of the molten resin and causes defects. In mass production of split cores of HEV motors, it is desirable for the cavity to allow alignment deviation of the split cores 12 inserted into the mold member 30 to a tolerance of up to 0.5 mm. If set to a tolerance exceeding 0.5 mm, it will affect the resin behavior of the cavity.

As a detailed configuration of the present invention, the mold member 30 is characterized in that it forms a bobbin 20 in a structure in which an inner end 21 and an outer end 22 are connected by a support portion 23 on one side and the other side. .

In Figure 2, the bobbin 20 shows a state in which the inner end 21 and the outer end 22 are connected to each other by the support part 23. The inner end 21 has an opening 25 corresponding to the inner end 14 of the split core 12, and the outer end 22 has an opening 25 corresponding to the outer end 16 of the split core 12. ), and an insulating sheet 27 is disposed in the opening 25 adjacent to the support portion 23. The molten resin of the bobbin 20 can be used by mixing 50% GF, which is glass fiber, with PPA resin as the base. In mass production of the split core 12, the use of the bobbin 20 and the insulating sheet 27 is advantageous for improving quality and productivity in addition to saving molten resin.

As a detailed configuration of the present invention, the support member 40 is characterized by maintaining a set elastic force by arranging a plurality of disk springs 45 in parallel and series.

Referring to Figures 3 and 4, the split core 12 is supported using three slide cores 41. A plurality of disk springs 45 are disposed on each slide core 41 to apply elastic force. Using the disk spring 45 is advantageous for not only making the mold member 30 light and thin, but also for operational reliability. However, the disk springs 45 are placed in multiple positions while being overlapped to reinforce the elastic force and cushioning action. In any case, each slide core 41 responds to the alignment deviation of the split core 12 by using the elastic force of the disk spring 45 arranged concentrically with the shoulder bolt 43.

As a detailed configuration of the present invention, the elastic force generated by the dish spring 45 is set to correspond to an injection pressure in the range of 400 to 420 kgf.

Referring to Figures 4 and 5, the elastic force of the disk spring 45 applied to each slide core 41 must support the injection pressure. When the injection pressure is set to 410 kgf in the mass production of the split core of the HEV motor, the elastic force of the disk spring 45 is set to equal or more than this. Even if there is an alignment deviation in the split core (12), the position (posture) is elastically maintained during the injection process by linking the plurality of slide cores (41) and the dish spring (45), so that the overall quality, including the bobbin (20), is maintained. It is also advantageous for improving productivity.

As a detailed configuration of the present invention, the mold member 30 is characterized by maintaining adhesion to the edge of the insulating sheet 27 with the molten resin of the bobbin 20.

3 and 5(b), the two insulating sheets 27 are tightly supported using respective slide cores 51. The slide core 51, shoulder bolt 53, and movable block 57 of the auxiliary member 50 remain identical to those of the support member 40 shown in FIG. 5(a) and described above. In some cases, the auxiliary member 50 may be equipped with a disk spring 55. The insulating sheet 27 may be made of paper and may have some adhesive strength added to one side. Nevertheless, the adhesive force of the insulating sheet 27 to the split core 12 is maintained by the molten resin of the bobbin 20. The cavity of the mold member 30 is formed to include the edge of the insulating sheet 27.

As a detailed configuration of the present invention, the auxiliary member 50 is characterized in that the distance at which the insulating sheet 27 is pressed by the slide core 51 is maintained within 0.1 mm.

In Figure 5, the slide core 51 shows a state in which the insulating sheet 27 is supported on the side of the split core 12. It prevents the split core 12 and the insulating sheet 27 from peeling off due to high pressure during the injection process. The slide core 51 is in contact with the insulating sheet 27 before and after injection, and the pressurizing distance is preferably within 0.1 mm. If the insulating sheet 27 is pressed (adhered) more strongly than this, there is a risk of tearing. Like the support member 40 described above, the moving distance of the slide core 51 of the auxiliary member 50 is determined by linking the movable block 57 and an angular pin (not shown). The shoulder bolt 53 can adjust the pressing force by changing the relative position of the slide core 51 corresponding to the split core 12.

As an example of the operation, with the insulating sheet 27 attached to the side of the split core 12, it is placed in the upper mold 31 of the mold member 30, and the lower mold 32 is lowered to form the upper mold 31. ), a finished product with a bobbin 20 and an insulating sheet 27 formed on the split core 12 is created by injecting molten resin into the gate 35 in close contact with the gate 35.

Meanwhile, in the mold member 30 of the present invention, the slide cores 41 and 51 are illustrated as moving horizontally, but they can also be added to move vertically.

Although omitted in the illustration, the insulating sheet 27 can also be formed in the form of an adhesive tape with a thickness of approximately 0.25 mm and directly attached to the split core 12.

The present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the present invention. Therefore, it should be said that such variations or modifications fall within the scope of the patent claims of the present invention.

10: stator 12: split core
14: inner end 16: outer end
20: bobbin 21: inner end
22: outer end 23: support portion
25: opening 27: insulating sheet
30: Mold member 31: Upper mold
32: lower mold 33: guide part
35: Gate 40: Support member
41: Slide core 43: Shoulder bolt
45: Disc spring 47: Movable block
50: Auxiliary member 51: Slide core
53: Shoulder bolt 55: Disc spring
57: Movable block

Claims (7)

In the mold device for forming bobbins for mass production of split cores of HEV motors:
It is based on a mold member 30 that has an upper mold 31 and a lower mold 32 and accommodates a split core 12 of a laminated structure between the upper mold 31 and the lower mold 32,
The mold member 30 includes a support member 40 that elastically supports the split core 12 with a plurality of slide cores 41; An auxiliary member 50 supporting the insulating sheet 27 attached to the split core 12 with a plurality of slide cores 51; A gate 35 for forming the bobbin 20 by injecting molten resin into the cavity around the split core 12,
The mold member 30 inserts a split core 12 in which the alignment deviation of multiple stacked electrical steel sheets is allowed to be 0.5 mm or less so as not to affect the resin behavior of the cavity,
The mold member 30 has a bobbin structure in which the inner end 21 and the outer end 22 are connected to the support portion 23 on one side and the other side using a molten resin mixed with GF, a glass fiber, based on PPA resin. Forming (20),
The mold member 30 maintains adhesion to the edge of the insulating sheet 27 with the molten resin of the bobbin 20.
The support member 40 maintains the elastic force set by arranging a plurality of disk springs 45 in parallel and series, and the elastic force generated by the disk spring 45 is set to correspond to the injection pressure in the range of 400 to 420 kgf. ,
A shoulder bolt 43 is mounted on the lower mold 32 to be connected to the slide core 41, causing a change in the position of the slide core 41 depending on the degree of loosening and tightening, and the slide core 41 is a shoulder bolt. In connection with the dish spring (45) arranged concentrically with (43), the posture is elastically maintained during the injection process to respond to alignment deviation of the split core (12),
The support member 40 and the auxiliary member 50 are respectively installed to be able to slide laterally at the upper part of the lower mold 32, and are attached to the movable blocks 47 and 57 disposed on the outside of the lower mold 32. Forms a lateral through hole for inserting a tool for adjusting the shoulder bolt.
The auxiliary member (50) is a mold device for forming a bobbin for an HEV motor, characterized in that the distance at which the insulating sheet (27) is pressed by the slide core (51) is maintained within 0.1 mm. delete delete delete delete delete delete