JP2000333400A - Injection molding terminal block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molded terminal block which can be easily manufactured with a simple structure, and which can reduce the processing cost of a lead frame and improve the yield to greatly reduce the manufacturing processing cost. SOLUTION: In an injection-molded terminal block in which a plurality of lead frames are laminated at appropriate intervals and the whole is integrally formed of a resin material, lead frames 11 to 14 are formed in a tape shape and the tape-shaped leads are formed. Frame 1
The lead frames 11 to 14 and the spacers 20 are integrally buried with a resin material to form a substantially concentric lamination with the spacer 20 interposed therebetween.

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 to an external lead wire.

[0002]

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

[0003] The shape of the injection molded terminal block is determined by the structure of the motor, and is formed, for example, in a ring shape.

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

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

In this resin molding, the lead frame 1
Are partially laminated differently from two to four layers depending on the type of motor connection so that the holding portions 2 of the lead frames 1 do not overlap in the axial direction.

[0007]

By the way, in order to insulate the lead frames 1 from each other, a resin material is inserted between the layers (the intervals between the lead frames 1) to fill the intervals.
It is necessary to secure an insulation distance between the lead frames 1 before resin molding. Furthermore, it is necessary to hold the lead frames 1 of each phase at a sufficiently 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 the resin molding.

For this reason, the insulation distance interval is maintained by holding the lead frame 1 from above and below with the press pins of the mold.

However, the conventional injection molding 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 shape of a mold for resin molding becomes complicated, and there are cases where molding becomes difficult.

As a countermeasure, there is a method of manufacturing an insulating separator separately from the injection-molded terminal block and fitting it between the respective layers. Since the strength is low, the insulating separator must be formed over almost the entire area between the lead frames 1, and a large-scale preparation preparation is required.

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

Accordingly, 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 processing cost of the lead frame and improve the yield to greatly reduce the manufacturing processing cost. It is in.

[0013]

According to a first aspect of the present invention, there is provided an injection molded terminal block in which a plurality of lead frames are laminated at appropriate intervals and the whole is integrally formed of a resin material. In the above, the lead frame is formed in a tape shape, and the tape-shaped lead frame is placed vertically, laminated and arranged in a substantially concentric manner with a spacer interposed therebetween, and the lead frame and the spacer are integrally embedded with a resin material and molded. It was done.

According to a second aspect of the present invention, the spacer is provided with an interval maintaining portion for maintaining the interval between the lead frames of the inner and outer layers, and is formed integrally with the interval maintaining portion and inserted between the respective layers of the lead frame to prevent contact. And a spacer portion.

That is, according to the present invention, the lead frame is vertically arranged from the planar arrangement and the spacers are used, so that resin molding can be performed without requiring a complicated holding member for the lead frame.

Further, according to the present invention, the material yield of the lead frame is changed from a square plate to a plate-like body, and the material yield is greatly improved by punching.

According to the above configuration, when the lead frame is placed vertically, the resin is used in a state in which each of the lead frames of each phase is interposed at an appropriate interval to secure the insulation distance (rigidity) using spacers. Molding can be easily manufactured.
This simplifies the structure of the mold and significantly reduces the cost of mold production.

Furthermore, since each lead frame is punched from a long coil of a metal strip (for example, 5 to 20 mm wide) to form a tape-shaped lead frame, a waste material portion is significantly reduced as compared with a circular lead frame. As a result, the yield of the metal plate is improved, and the present invention can realize a significant cost reduction.

[0019]

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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

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

The four lead frames 11, 12,
The leads 13 and 14 are vertically arranged on the outermost layer side, the outer layer side, the inner layer side, and the innermost layer side. Frame 11,
It is laminated with a grooved spacer 20 for forming an insulating space between 12, 13, and 14.

As shown in FIG. 2, the grooved spacer 20 has a space holding portion 21 having a U-shaped cross section for holding the space between the lead frames 11, 12, 13, 14 of the inner and outer layers, and the space holding portion 21. Lead frames 11, 1
The spacer portion 22 is inserted between the layers 2, 13, and 14 to prevent contact, and is formed in a comb shape in cross section as a whole. Further, the spacer portion 22 has
The spacer portions 22 can be easily formed on the lead frames 11, 12, 1
A guide portion 22 for guiding so that it can be inserted between 3, 14
g.

The lead frames 11, 12,
13 and 14 are provided with a large number of connection terminals 1 at predetermined intervals.
5 are formed. The connection terminal 15 has a U-shaped connection groove 15 for connecting to a winding of a motor or an external lead wire.
m is formed.

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

Next, a 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.
A long metal sheet strip having a width of m is formed and continuously punched out by a press to form lead frames 11, 12, 12, which are arranged on the outermost layer side, outer layer side, inner layer side, and innermost layer side. 1
After the formation of the contact terminals 3 and 14, the contact terminals 15 are bent and formed by progressive feeding.

Thereafter, the lead frames 11, 1
2, 13 and 14 are arranged vertically and substantially concentrically, and the spacer portion 22 of the grooved spacer 20 is attached to each lead frame 1.
Insert between 1,12,13,14. At this time, since the spacer portion 22 is guided by the guide portion 22g, it is easily inserted.

The lead frames 11, 12, 13, 14 thus sandwiched at appropriate intervals by the grooved spacers 20.
Are placed in a mold in a state where each insulation distance is secured (rigidized), and resin molding is performed in the mold by injection molding to manufacture an injection molded terminal block.

As described above, according to the present invention, since the shapes of the lead frames 11, 12, 13, and 14 are simpler than those of the related art, the lead frames 11, 12, 13, and 14 can be manufactured by a series of operations (a progressive die). The structure is simplified, 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 strip, the amount of waste material is drastically reduced as compared with the conventional circular lead frame, and the yield of the metal plate is improved. However, the cost can be significantly reduced.

In this embodiment, the injection-molded terminal block for connecting the windings of the three-phase AC motor to the external lead wires has been described. However, the number of lead frames, the number of connection terminals, and the connection terminals are provided. Needless to say, the position can be changed as appropriate 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 of a long-strip plate, continuous production is possible (semi-automatic), and the processing cost of the lead frame is reduced and the yield is reduced. Can be improved, and manufacturing costs are greatly reduced.

Further, in the present invention, since the lead frame has a simple structure, the injection mold can be formed to have a simple structure, so that the mold cost and the molding cost can be reduced.

[Brief description of the drawings]

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

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

FIG. 3 is a perspective view of an injection-molded terminal block showing one 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 diagram showing a waste portion of a square plate as a conventional lead frame material.

[Explanation of symbols]

 11 to 14 Lead frame 15 Connection terminal 20 Spacer with groove 21 Spacer 22 Spacer 30 Injection molding resin

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 31:34 (72) Inventor Kenichi Egami 4-10-1, Kawajiri-cho, Hitachi City, Hitachi City, Ibaraki Prefecture Hitachi Cable Processing Stock In-house (72) Inventor Kiyoshi Nihei 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture F-term (reference) 4F206 AD03 AD18 AD35 AG19 AG21 AH33 JA07 JB20 JF05 JL02 JN25 JQ06 JQ81 5H604 AA05 BB01 DB01 PB03 PC01 QA01 QB03 QB12 5H615 AA01 BB01 BB14 PP01 QQ03 QQ27 RR07 SS44

Claims (2)

[Claims] 1. An injection-molded terminal block in which a plurality of lead frames are laminated at appropriate intervals and integrally formed of a resin material, wherein the lead frame is formed in a tape shape and the tape-shaped lead frame is formed. An injection-molded terminal block, which is vertically arranged, arranged substantially concentrically with a spacer interposed therebetween, and formed by integrally embedding the lead frame and the spacer with a resin material. 2. A spacer comprising: a space holding portion for holding a space between lead frames of inner and outer layers; and a spacer portion formed integrally with the space holding portion and inserted between layers of the lead frame to prevent contact. The injection molded terminal block according to claim 1.