JP3489484B2 - Injection molding terminal block - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molded terminal block, and more particularly to an injection molded terminal block used as a wiring component for connecting a winding of a motor and an external lead wire.

[0002]

2. Description of the Related Art Generally, an injection molded terminal block is known as a wiring component for connecting a winding of a motor and an external lead wire.

The shape of this injection-molded terminal block is determined by the structure of the motor and is formed in a ring shape, for example.

As shown in FIG. 4, the ring-shaped injection-molded resin base is a shaped product in which the substantially flat ring-shaped lead frames 1 are laminated in a plurality of stages at appropriate intervals and integrally resin-molded. .

Conventionally, in order to manufacture this injection-molded terminal block, for example, when a lead frame having a diameter D is formed, a square plate p having a side length D is punched in a desired shape with a press as shown in FIG. A plurality of lead frames 1 are formed, and each lead frame 1 is partially bent to form a holding portion 2. The lead frames 1 are superposed on each other, and a holding pin provided in a mold for resin molding. Then, the holding portions 2 of the lead frames 1 are held at the intervals described above, and in this state, the resin is injected into the mold to be integrally molded.

In this resin molding, the lead frame 1
In order to prevent the holding portions 2 of the lead frames 1 from overlapping in the axial direction depending on the type of connection of the motor, the layers are partially laminated differently from two layers to four layers.

[0007]

By the way, in order to insulate the lead frames 1 from each other, a resin material is inserted between the layers (the gap between the lead frames 1) to fill the gap.
It is necessary to secure an insulation distance between the lead frames 1 before resin molding. Further, it is necessary to hold the lead frames 1 of the respective phases at a sufficient constant interval so that the lead frames 1 of the respective phases do not come into contact with each other due to the resin pressure during resin molding.

Therefore, the insulation distance is maintained by sandwiching the lead frame 1 from above and below with the pressing pins of the mold.

However, the conventional injection molded terminal block is
Since the three-layer and four-layer portions of the lead frame 1 are arranged so as not to vertically overlap with other layers, the mold shape for resin molding becomes complicated and molding may be difficult in some cases.

As a countermeasure against this, there is a method of manufacturing an insulating separator separately from this injection molded terminal block and fitting it into each layer. Since the strength is low, the insulating separator has to be formed over almost the entire area between the lead frames 1, and large-scale production preparation is required.

When the injection-molded terminal block is ring-shaped as described above, a metal square plate p having a length D on one side is pressed to form the ring-shaped lead frame 1 as shown in FIG. Since it is formed by punching, the circular part c formed inside the lead frame inner diameter and the plate parts of the corner parts s formed at the four corners of the lead frame material become waste materials, and the yield is very poor. It was a factor of price increase.

Therefore, an object of the present invention is to provide an injection-molded terminal block which can be easily manufactured with a simple structure, and which can reduce the manufacturing cost of the lead frame and improve the yield to significantly reduce the manufacturing cost. Especially.

[0013]

In order to solve the above-mentioned problems, the invention of claim 1 is an injection-molded terminal block in which a plurality of lead frames are laminated at appropriate intervals and the whole is integrally molded with a resin material. In, a metal plate strip is punched out to form a plurality of lead frames having connection terminals, the connection terminals of the lead frames are bent, and the connection terminals of each layer are positioned on one side. Placed vertically in a circle, and arranged in a concentric circle with spacers, and the lead frame and spacers are integrally embedded with a resin material for molding, and each layer is connected to the surface of the injection molded resin. Only the terminals are exposed
It is molded as described above .

According to a second aspect of the present invention, the spacer is a space holding portion for holding the space between the lead frames of the inner and outer layers, and is formed integrally with the space holding portion and is inserted between the respective layers of the lead frame to prevent contact. And a spacer portion to be used.

According to the above structure, the present invention provides a lead frame.
A circular spacer in which the layout of the chamber is arranged vertically from the plane
Depending on whether it is a square plate or not,
Can be made into a plate and strip, and by punching it
Greatly improve the yield.

Further, the lead frames are arranged in a substantially concentric shape.
The lead frames of each layer with spacers at appropriate intervals.
Resin insulation with the insulation distance secured (rigid)
By shaping, resin molding without the need for complicated holding members
Machining is possible, and the mold structure is simple.
The die manufacturing cost is greatly reduced.

In addition, the connection terminals are bent to form a lead frame.
The entire mold is integrally molded with resin material and its injection molding tree
By exposing the connection terminals on the surface of the grease, the motor winding
The parts other than the parts connected to the
The necessary contact can be prevented.

Further, each lead frame is punched out from a long coil of a metal strip (for example, a width of 5 to 20 mm) to form a tape-shaped lead frame, so that a waste material portion is drastically reduced as compared with a circular lead frame. As a result, the yield of the metal plate is improved, and the present invention can significantly reduce the price.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 shows a perspective view of the injection-molded terminal block according to the present invention.

As shown in FIG. 1, the injection-molded terminal block includes four lead frames 11 formed in a tape shape.
It is mainly composed of 12, 13, and 14.

These four lead frames 11, 12,
13 and 14 are vertically placed on the outermost layer side, the outer layer side, the inner layer side, and the innermost layer side, and when arranged in a substantially concentric shape, the leads are divided into three parts in four in the circumferential direction. Frame 11,
The grooved spacers 20 for forming an insulating space are sandwiched between the layers 12, 13, and 14.

As shown in FIG. 2, this grooved spacer 20 has a U-shaped cross-section holding portion 21 for holding the distance between the lead frames 11, 12, 13, 14 of the inner and outer layers, and the distance holding portion 21. And lead frames 11, 1 formed integrally with
The spacer portion 22 is inserted between the layers 2, 13 and 14 to prevent contact with each other, and has a comb-shaped cross section as a whole. Further, the spacer portion 22 has
The spacer 22 can be easily attached to the lead frames 11, 12, 1
Guide part 22 for guiding so that it can be inserted between 3, 14
g.

Further, the lead frames 11, 12 of each layer,
A large number of connection terminals 1 and 13 are provided at predetermined intervals.
5 is formed. The connecting terminal 15 has a U-shaped connecting groove 15 for connecting to a winding of the motor or an external lead wire.
m is formed.

As shown in FIG. 3, the injection molding terminal block has lead frames 11, 12, 13, 14 so that only the connecting terminals 15 of each phase are exposed from one side.
The grooved spacer 15 and the grooved spacer 15 are integrally molded by injection molding resin 30.

Next, the method of manufacturing the injection-molded terminal block will be described together with its operation.

When manufacturing the injection-molded terminal block shown in FIG. 1, for example, 5 to 20 m is punched out from the long coil.
A long-winding metal plate strip having a width of m is formed, continuously punched by a press, and the lead frames 11, 12, which are arranged on the outermost layer side, the outer layer side, the inner layer side, and the innermost layer side, 1
After forming 3, 14, the connection terminal 15 is formed by bending the connection terminal 15 in a progressive manner.

After that, the lead frames 11, 1 are
The 2,13,14, connection terminals 15 and vertically so that the pieces side arranged substantially concentrically, each of the spacer portions 22 of the grooved spacer 20 lead frame 11, 12
Insert in between. At this time, the spacer portion 22 is replaced by the guide portion 22.
Since it is guided by g, it can be easily inserted.

The lead frames 11, 12, 13, 14 sandwiched by the grooved spacers 20 at appropriate intervals in this manner.
Are placed in a mold with each insulation distance secured (rigidized), and resin molding is performed in the mold by injection molding , and the connection terminals 15 are exposed on the surface of the injection molding resin 30. > Injection molded terminal blocks are manufactured.

As described above, according to the present invention, the lead frames 11, 12, 13, 14 have a simpler structure than the conventional ones, so that the lead frames 11, 12, 13, 14 can be manufactured by a series of operations (progressive mold) and the molds can be manufactured. The structure is simple, and the die manufacturing cost is greatly reduced.

Further, according to the present invention, since the lead frames 11, 12, 13, and 14 are manufactured from the plate-shaped body, compared with the conventional circular lead frame, the portion of the scrap material is drastically reduced, and the yield of the metal plate is improved. However, it is possible to significantly reduce the price.

In this embodiment, the injection-molded terminal block for connecting the winding of the three-phase AC motor and the external lead wire has been described, but the number of lead frames and the number of connection terminals, and further connection terminals are provided. It goes without saying that the position can be appropriately changed according to the structure of the motor and the type of connection.

[0033]

In summary, according to the present invention, since the lead frame is formed from a long strip of strip, continuous production is possible (semi-automated), the lead frame processing cost is reduced, and the yield is reduced. It can be improved and the manufacturing and processing cost can be greatly reduced.

Further, in the present invention, since the lead frame has a simple structure, the injection molding die can be formed in a simple structure, and the die cost and the molding processing cost can be reduced.

Further, the connecting terminals are bent to form lead wires.
The entire ram is integrally molded with resin material and its injection molding
By exposing the connection terminals on the resin surface, the motor winding
The part other than the part connected to the wire etc. can be housed in the injection molding resin,
Unnecessary contact can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of a lead frame of an injection molded terminal block showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view of an injection molding terminal block showing an embodiment of the present invention.

FIG. 4 is a perspective view of a lead frame of a conventional injection molded terminal block.

FIG. 5 is a view showing a portion of a conventional rectangular plate, which is a lead frame material, which is a waste material.

[Explanation of symbols]

11-14 Lead frame 15 connection terminals 20 Grooved spacer 21 Spacing part 22 Spacer 30 injection molding resin

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI B29L 31:34 B29L 31:34 (72) Inventor Kiyoshi Nihira 4-10-1 Kawajiri-cho, Hitachi-shi, Ibaraki Nitatsu Electric Wire Processing Co., Ltd. In-house (56) Reference JP-A-9-200991 (JP, A) JP-A-2000-333418 (JP, A) JP-A-6-22486 (JP, A) JP-A-10-248187 (JP, A) Special table HEI 7-505278 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02K 3/50 B29C 45/14 H02K 15/12

Claims (2)

(57) [Claims] 1. An injection-molded terminal block in which a plurality of lead frames are laminated at appropriate intervals and integrally molded of a resin material, and a plurality of lead frames having connection terminals are punched out of a metal plate strip. Form the lead frame, bend the connecting terminals of the lead frame, and place these lead frames vertically so that the connecting terminals of each layer are located on one side, and in a circular shape, and in a substantially concentric shape with a spacer. So that the lead frame and the spacer are integrally embedded with a resin material and molded, and only the connection terminals of each layer are exposed on the surface of the injection molded resin.
Injection molding the terminal block, characterized in that molded. 2. The spacer comprises a space holding portion for holding the space between the lead frames of the inner and outer layers, and a spacer portion formed integrally with the space holding portion and inserted between the respective layers of the lead frame to prevent contact. The injection-molded terminal block according to claim 1.