JPH0621187Y2 - connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a connector. More specifically, the present invention relates to a resin-molded connector in which a coil spring-soldered connection fitting for energization is insert-molded with a molding resin.

[Background technology]

To facilitate the connection between the connectors, there is a connector provided with a coil spring on one side. In this type of connector, generally, a coil spring is inserted around the outer periphery of the connection fitting, the end of the coil spring is soldered and fixed to the connection fitting, and then the connection fitting is insert-molded in the molding resin. It is resin molded.

The form of the coil spring used here includes, for example, those shown in FIG. 5 and those shown in FIG. 7.

The coil spring 1a of the first conventional example shown in FIG.
The whole is in a roughly wound state and the windings are separated from each other. Then, the coil spring 1a is provided on the outer periphery of the connection fitting 5.
The end portion of the coil spring 1a is fixed to the connection fitting 5 by soldering between the coil spring 1a and the connection fitting 5.

Further, FIG. 7 shows a second conventional example, in which a close winding part 3a is formed at the end of the coil spring 1b, and the close winding part 3a is attached to the outer periphery of the connection fitting 5 and solder 7 is applied. It is designed to be fixed.

[Problems to be solved by the device]

Conventionally, as described above, there are one that uses a coil spring that is roughly wound as a whole and one that uses a coil spring that has a close-wound portion formed only at its end. It had the following advantages and disadvantages.

When the coil spring 1a in the form of the first conventional example shown in FIG. 5 is used, when the coil spring 1a and the connection fitting 5 are soldered, the solder 7 becomes the coil spring 1a.
Since it enters between the windings, it is possible to easily confirm that the solder 7 has entered between the windings and attached to the connecting fitting 5, or the solder 7 can be surely soldered by increasing the area of attachment to the connecting fitting. . However, on the other hand, as shown in FIG. 6, even when the coil spring 1a is held between the connection fitting 5 and the mold 8 during resin molding, the mold resin 6a is not removed along the gap between the separated windings. There is a drawback that the resin leaks in a spiral shape and the mold resin 6a adheres to the coil spring 1a. When the mold resin 6a adheres to the coil spring 1a in this way, there is a problem in that the expansion and contraction of the coil spring 1a is hindered. Further, when the coil spring 1a is compressed and deformed, the compressed deformation is also transmitted to the soldered portion of the coil spring 1a, so that the soldered portion of the coil spring 1a may be disengaged from the connection fitting 5.

Further, in the second conventional example shown in FIG. 7, since the end of the coil spring 1b is the close winding portion 3a and the windings are in close contact with each other, the connection fitting 5 is connected to the mold resin portion 6a.
At the time of insert molding, it is possible to prevent the mold resin 6a from being spirally transmitted between the windings and leaking, and the mold resin 6a does not adhere to the coil spring 1b to prevent expansion and contraction. However, when the densely wound portion 3a is inserted into the outer periphery of the connection fitting 5 and soldered, the solder 7 is wound on the densely wound portion 3a because the windings are in close contact with each other as shown in FIG. It is difficult for the solder 7 to flow into the space, and therefore, the adhesion area of the solder 7 to the connection fitting 5 cannot be sufficiently secured, and the soldering strength becomes insufficient, and the coil spring 1b easily comes off the connection fitting 5. It was In addition, it is impossible to determine from outside whether the solder 7 is attached only to the surface of the tightly wound portion 3a or has penetrated into the tightly wound portion 3a, and it is possible to confirm whether or not the soldering is reliably performed. It was difficult.

Therefore, in both conventional examples, one advantage is the other's disadvantage, and one disadvantage is the other's advantage, so that the advantages of both conventional examples cannot be combined.

Therefore, the present invention provides a connector having the advantages of both of the above-described conventional examples, capable of reliably soldering the coil spring to the connection fitting, and preventing resin leakage at the coil spring portion during resin molding. It is an object.

[Means for Solving the Problems]

For this reason, the connector of the present invention forms a coarse winding portion in which the windings are separated from each other on the fixed side end portion of the coil spring, and a close winding portion in which the windings are closely attached to the free end side of the rough winding portion. The fixed side end is inserted into the outer circumference of the connection fitting and the rough winding portion of the coil spring is soldered to the outer peripheral surface of the connection fitting, and at least the rough winding portion inserted into the connection fitting is closer to the free end side. It is characterized in that the connection fitting is fixed in the mold resin portion in a state where the outer periphery of the coil spring and the mold resin are separated from each other.

[Action]

As described above, according to the present invention, the coil spring is formed on the fixed side end of the coil spring with the windings spaced apart from each other. By soldering to the metal fittings, the molten solder can easily flow between the windings, ensure a sufficient solder adhesion surface and perform strong soldering, and ensure that the solder adheres sufficiently to the connection fittings. Can be easily confirmed. Further, since at least the outer periphery of the coil spring on the free end side of the rough winding portion and the mold resin are separated from each other, the coil spring on the free end side of the rough winding portion smoothly expands and contracts without contacting the mold resin. Is something that can be done. Moreover, since the close-wound portion is formed on the free end side of the rough-wound portion, even if the mold resin enters from the rough-wound portion at the time of resin molding, the mold resin is a close-wound portion closely wound between the windings. It is stopped, and the mold resin does not leak and adhere to the compressed portion beyond that, and there is no risk of malfunction of the coil spring. Moreover, since there is a close winding portion on the free end side of the rough winding portion that is soldered, the compression winding deformation cannot occur in the rough winding portion by separating the close winding portion that cannot be compressed and deformed even if the compression portion of the coil spring is compressed. Without being transmitted, there is no fear that the soldering of the rough winding portion will come off due to deformation.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A sectional view of the entire connector A is shown in FIG. This connector A is, for example, one of a pair of connectors for connecting the output of a high-voltage power supply and the input of various machines, and a pair of connectors (not shown) in the molded resin portion 6. The connection fitting 5 for contacting with the connection fitting (d) and energizing is inserted, and the coil spring 1 is attached to the outer periphery of the connection fitting 5.

As shown in FIG. 3, the connection fitting 5 is formed of a conductive material such as brass in a cylindrical shape, and a plate-shaped tongue piece 9 is integrally projected from the rear edge. The core wire 11 of the lead wire 10 is soldered to the tongue piece 9. The coil spring 1 is a compression spring formed by spirally winding a winding wire, but has a densely wound portion 3 in which the winding wires are closely attached to each other at the rear end portion.
Is formed, and a coarse winding portion 4 in which windings are separated from each other is formed at the rear end of the close winding portion 3. Here, the tight winding part 3 needs several turns, and the coarse winding part 4 has 0.3 turns or more.
It is within the range of 3 turns. Thus, the coil spring 1 has the fixed side end 2 composed of the rough winding portion 4 and the close winding portion 3. After the fixed side end 2 is inserted into the outer periphery of the connection fitting 5, the coarse winding portion 4 is wound. Solder the part 4 to the connection fitting 5 and connect the coil spring 1 and the connection fitting 5 as shown in FIG.
And are integrated. By soldering at the rough winding portion 4, the solder 7 easily enters between the windings and is welded to the outer peripheral surface of the connection fitting 5, so that the coil spring 1 and the connection fitting 5 can be reliably soldered. is there. Moreover, since the outer peripheral surface of the connection fitting 5 is visible between the windings,
It is possible to easily confirm that the soldering is being carried out with certainty. A compression part 12 is formed in front of the densely wound part 3 of the coil spring 1 with the windings separated from each other, and occupies most of the coil spring 1. The compression portion 12 projects from the front end of the connection fitting 5 and is compressed when a pair of connectors is connected to facilitate connection between the connectors.

The connection fitting 5 is insert-molded in the mold resin portion 6, and a part of the structure of a molding die for that purpose is shown in FIG. The outer die 13 for molding the outer surface of the mold resin portion 6 has a structure that is divided into left and right from the parting line, and the inner die 14 for forming the inner surface of the mold resin portion 6 is an outer die. It is set so as to be inserted into the inside 13. Also, the inner mold 14
A fitting holding portion 15 for fitting the leading end of the tubular connection fitting 5 is provided at the tip end of the fitting holding portion 15, and an annular shape for delivering the coil spring 1 to the outer circumference of the fitting holding portion 15. The groove portion 16 is formed, and the cylindrical portion 1 for contacting the outer periphery of the coil spring 1 is provided on the outer periphery of the annular groove portion 16.
7 are formed. Then, when insert-molding the connection fitting 5 in the molding resin, first, the fitting holder 15 is fitted to the tip of the connection fitting 5 to hold the connection fitting 5. At this time, the inner peripheral surface of the cylindrical portion 17 is in contact with the outer peripheral surface of the tightly wound portion 3 of the coil spring 1 which is accommodated in the annular groove portion 16, so that the inside of the annular groove portion 16 has the fitting holding portion 15 inside. The outer peripheral surface, the inner peripheral surface of the cylindrical portion 17, and the tightly wound portion 3 of the coil spring 1 form a substantially sealed state. Here, since the cylindrical portion 17 does not cover the outer peripheral surface of the rough winding portion 4, the solder 7 of the rough winding portion 4 does not hinder the insertion of the connecting fitting 5 into the annular groove portion 16. Therefore, the inner mold 14 holding the connection fitting 5 is set in the outer mold 13, and the mold resin 6 is set in the cavity 18.
When a is injected, the molding resin 6 is placed inside the connection fitting 5.
Although a is injected and the connecting fitting 5 is fixed to the mold resin portion 6, since the inside of the annular groove portion 16 is sealed by the close winding portion 3, the mold resin 6a may leak into the annular groove portion 16 and enter. In addition, the leaked mold resin 6a does not adhere to the coil spring 1. Therefore, the connector A as shown in FIG. 1 can be obtained by removing the molded product from the molding die.
Since the molding resin 6a is not attached to the compression portion 12 and the tightly wound portion 3, the coil spring 1 smoothly expands and contracts. On the other hand, the soldered rough winding portion 4 is firmly held by the mold resin portion 6. Further, since the densely wound portion 3 in which windings are clogged is interposed between the compression portion 12 that expands and contracts and the coarsely wound portion 4 that is soldered, the deformation of the compression portion 12 during operation is caused by the tightly wound portion. It is cut off at 3 and is not transmitted to the rough winding portion 4, so that the soldered portion is hard to come off.

According to the present invention, it is only necessary to change the shape of the coil spring 1, and it is not necessary to change the conventionally used molding die or the like. Therefore, the connector can be improved without increasing the cost. it can.

[Effect of device]

As described above, according to the present invention, the coil spring and the connection fitting can be soldered with sufficient strength, and the soldering can be easily confirmed. Further, the coil spring can be smoothly expanded and contracted. Moreover, when the connection fitting is resin-molded, the mold resin does not leak to the compression side of the coil spring, and the leaked mold resin does not hinder the movement of the coil spring. As a result, defective soldering and defective operation of the coil spring can be reduced, so that it is possible to reduce costs by reducing the defective product generation rate.

Further, since the movement of the compression portion of the coil spring is not transmitted to the soldered rough winding portion, there is no fear that the soldering will come off even if the coil spring repeatedly expands and contracts.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view showing the coil spring and the connection fitting, and FIG. 3 is an exploded perspective view of the coil spring and the connection fitting.
The figure is a partially enlarged cross-sectional view showing the molding method of the above connector,
FIG. 5 is an exploded perspective view showing a conventional coil spring and a connecting fitting, and FIG. 6 is a partially enlarged sectional view showing a state when the coil spring and the connecting fitting are insert-molded.
FIG. 8 is an exploded perspective view showing another conventional coil spring and a connecting fitting, and FIG. 8 is a partially enlarged sectional view showing a state in which the above coil spring is soldered to the connecting fitting. 1 ... Coil spring, 2 ... Fixed side end 3 ... Dense winding part, 4 ... Coarse winding part, 5 ... Connection fitting, 6 ... Mold resin part

Claims (1)

[Scope of utility model registration request] 1. A coarse winding portion in which windings are separated from each other is formed at an end of a fixed side of a coil spring, and a close winding portion is formed in which windings are in contact with each other on a free end side of the rough winding portion. Attach the fixed side end to the outer peripheral surface of the connection fitting and solder the rough winding part of the coil spring to the outer peripheral surface of the connection fitting. A connector, characterized in that a connection fitting is fixed in a mold resin portion in a state where an outer periphery and a mold resin are separated from each other.