JP2006120384A - Tube terminal and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube terminal with excellent airtightness and mechanical/electrical connection property by using a tube having spiral inner surface fins. <P>SOLUTION: This tube terminal 1 having the spiral inner surface fins has a terminal part 4 and a conductor connection part 3. The tube is made of copper or a copper alloy. The inner surface fins are 20 or more, the height of the inner surface fins is 0.1 mm or more, and the torsion angle of the inner surface fins is 0 to 90 degrees. In the manufacturing method for the tube terminal, the tube having the spiral inner surface fins is flattened to form the terminal part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wire terminal connection structure, and more particularly to a tube terminal connection structure suitably used for connection with an electric wire.

  The tube terminal 1 has a flat processed portion 2 at one end of the tube, and a conductor exposed by peeling off the insulating layer at the cable end portion is inserted into the conductive wire connecting portion 3 at the other end to shrink the conductive wire connecting portion 3. A terminal for connecting a conductor with a diameter. The flat processed portion 2 is connected to other terminals through bolts through bolt holes.

  However, the conventional tube terminal 1 generally forms the flat processed portion 2 by pressing the tube, but it is inevitable that a gap is formed only by pressing. For this reason, the inside of the flat processed part 2 is inferior in airtightness, and there is a possibility that moisture may enter. Furthermore, when the materials of the conductor and the terminal are different, there is a problem that contact corrosion of different metals (electrolytic corrosion) occurs. For this reason, filling with solder, inserting a silicon-based sheet or the like, or joining by a medium frequency induction heating and pressure welding method is performed to improve airtightness.

  There is an example of a compression type copper tube terminal in which one end of a copper tube is processed into a flat shape to form a terminal portion and joined by a medium frequency induction heating pressure welding method (for example, Patent Document 1).

JP 2003-92025 A

  However, it takes cost and time to perform solder filling, induction heating and pressure welding. For this reason, there has been a demand for a compression-type copper tube terminal that satisfies hermeticity only by simple compression processing. This invention is made | formed in view of said situation, The objective is to provide the tube terminal excellent in airtightness, and its manufacturing method.

That is,
(1) A tube terminal characterized by having a spiral inner fin (2) A tube terminal according to (1), characterized by having a terminal portion and a conductor connection portion (3) The tube is made of copper or a copper alloy (4) A tube terminal having a spiral inner fin, wherein the inner fin is 20 or more, the fin height is 0.1 mm or more, and the tube axis direction is characterized in that The tube terminal according to any one of (1) to (3), wherein the twist angle β of the fin is greater than 0 degree and less than 90 degrees.
(5) The tube terminal manufacturing method according to any one of (1) to (4), wherein a tube having a spiral inner fin is processed into a flat shape to form a terminal portion. It is a manufacturing method of a terminal.

  In the present invention, since a tube terminal having a spiral inner fin is used as a tube terminal, the inner groove is brought into close contact with the flat processed portion, thereby improving the airtightness. Further, the spiral inner fin has a serration role, and the bondability with the conducting wire is improved. Therefore, there is a significant industrial effect.

  The present invention will be specifically described below. An example of the embodiment in the tube terminal 1 of this invention is shown in FIG. The tube terminal 1 is obtained by processing one end of a tube 10 having a spiral inner fin into a flat shape, and joining the flat processed portion 2 by press working to form a terminal portion 4. In the terminal portion 4, the top of the spiral inner fin 9 is deformed to obtain complete airtightness. For this reason, moisture does not enter the flat tube inscribed portion 5. In FIG. 1, 6 is a bolt hole, and 3 is a conductor connecting portion.

  2 and 3 are process explanatory views showing an example of an embodiment of the manufacturing method for the tube terminal 1 of the present invention. One end of a tube 10 having a spiral inner fin is processed into a flat shape as shown in FIG. 2 to obtain a tube terminal 1 having a flat processed portion 2 and a conductor connecting portion 3. Next, as shown in FIG. 3, the flat tube inscribed portion 5 is joined by pressing with a press 8 to form the terminal portion 4, thereby completing the tube terminal 1.

  An example of an embodiment of the tube terminal 1 of the present invention is shown in FIG. FIG. 4 is a top view of the tube terminal 1 of the present invention. The conductor 12 is connected by peeling the insulating layer 13 to expose the conductor 12, inserting the conductor 12 into the conductor connecting portion 3, and pressing (caulking) to fix the conductor. In the tube terminal 1 of the present invention, the helical fins on the inner surface of the conductor connection portion 3 play the role of serration, so that the connection strength between the tube terminal 1 and the conductor 12 is improved. Thereby, since the contact resistance between the tube terminal 1 and the conducting wire 12 is also stabilized, the mechanical and electrical connection is stabilized. In order to prevent the conductive wire 12 from being exposed, the insulating layer 13 and the compression processed portion 11 may be covered with an insulating protective layer.

  An example of an embodiment of the tube terminal 1 of the present invention is shown in FIG. FIG. 5 is a cross-sectional view of the tube terminal 1 according to the present invention taken along line AB in FIG. The conductor is fixed by inserting the conducting wire 12 into the conducting wire connecting portion 3 and compressing it. At this time, the spiral inner fin 9 is deformed to fill a gap between the conductor 12 and the inner surface of the tube. Furthermore, the spiral inner fin 9 bites into the lead wire 12 and the lead wire 12 is deformed. Thereby, the mechanical connection and electrical connection of the tube terminal 1 and the conducting wire 12 become strong.

  An example of an embodiment of a tube 10 having spiral inner fins in the tube terminal 1 of the present invention is shown in FIG. FIG. 6 is a developed view of the tube inner surface of the tube 10 having spiral inner fins used in the tube terminal 1 of the present invention. The tube used for the tube terminal 1 of the present invention has a spiral inner fin 9. The spiral inner fin 9 has a twist angle β with respect to the tube axis direction L. The helical inner fin 9 is formed into an airtight tube terminal 1 by deforming and collapsing the fin when the flat processed portion 2 is pressed.

  The number of the spiral inner fins 9 is preferably 20 or more. The number may be less than 20, but in the case of 20 or more, the number of locations where the fins are crushed increases, resulting in excellent airtightness. Preferably it is 40 or more. The height of the spiral inner fin 9 is preferably 0.1 mm or more. Although it may be less than 0.1 mm, when it is 0.1 mm or more, the number of locations where the fins are crushed increases, so that the airtightness is preferably 0.2 mm or more. In addition, the height of a fin means the length from the base of a fin to the top of a fin.

  The twist angle β of the spiral inner fin 9 with respect to the tube axis direction L is preferably more than 0 degree and less than 90 degrees. The twist angle β may be 0 degree or 90 degrees, but when it exceeds 0 degree and less than 90 degrees, the inner fin 9 is crushed and excellent in airtightness. The angle is preferably 10 to 80 degrees, more preferably 20 to 70 degrees.

  As a method of manufacturing the tube 10 having a spiral inner fin used for the tube terminal 1 of the present invention, a plurality of different types of grooves having different forms are provided on one side of a metal strip as disclosed in JP-A-4-158193. There is a method in which the metal strip is formed into a tubular shape and welded so that the groove is inside. Further, a grooved plug is held in a smooth tube drawn out as in JP-A-55-103215, and the outer periphery of the tube is pressed by a rolling tool so that the groove is transferred into the tube. There is a so-called rolling method. The material of the tube terminal 1 of the present invention is preferably copper or a copper alloy, but is not limited thereto, and any material having conductivity may be used.

  The conducting wire electrically connected to the tube terminal 1 of the present invention may be any conductive wire. Preferably, it consists of aluminum or aluminum alloy, copper or copper alloy.

  The present invention is not limited to the embodiment described above, and can be implemented in various modes without departing from the gist of the present invention. Although the tube terminal 1 having a fastening portion is shown in the above embodiment, for example, a configuration for relay connection or branch connection between conductors may be used. Moreover, although the aluminum lead of the Example showed what bundled several strands, it is applicable also to a single wire. Furthermore, various methods are applied also to the press work of the flat processed part 2.

  Hereinafter, the present invention will be described in detail with reference to examples. One end of a copper tube made of phosphorous-deoxidized copper and having an outer diameter of 16.0 mm and a bottom wall thickness of 1.0 mm was processed into a flat shape to produce a tube terminal 1. In the example of the present invention, the tube terminal 1 was produced using the tube 9 having the spiral inner fins, and the lead wire 12 was inserted into the lead wire connecting portion 3 and pressed (caulked). The shape of the fin is as shown in Table 1. In the comparative example, a copper tube with a smooth inner surface or a crimp terminal which is a conventional product was used, and the conductive wires were connected by the method described in Table 1. In Comparative Example 3, the method described in JP-A-2003-92025 was used. In Comparative Examples 4 and 5, crimp terminals described in JP-A No. 2003-249284 were used. The conducting wire was an aluminum electric wire 34SQ, and a 19/22 / 0.32 diameter conducting wire was used for the rope twist structure. The compression operation was performed such that the residual compression ratio of the conductor (ratio of the conductor cross-sectional area after compression to the conductor cross-sectional area before compression) was 80%.

  About each manufactured said terminal, the airtightness test and the breaking load were evaluated. In the airtightness test, 0.2 MPa nitrogen gas was introduced from the inside of the terminal, and the presence or absence of air leakage in water was confirmed. The case where there was no air leak was judged as ◯, and the case where there was a leak was judged as ×. The breaking load was evaluated by performing a tensile test using the terminal and the electric wire and breaking the load. The contact resistance was measured by increasing the contact resistance between the terminal and the conductor. The measurement was performed at an energization current of 0.1 mA or more by a four-probe method using a power supply apparatus having a voltage of 0.1 V or less and a current of 0.01 A or less and a voltmeter having an accuracy of 0.01 mV or less. Judgment of the breaking load and contact resistance is made at the level of the barrel crimping method currently used as the connection method of cables and terminals. In the case of 34SQ, the breaking load is 2 kN or more and the contact resistance is 20 μΩ or less. It was.

  As can be seen from Table 1, the examples of the present invention are excellent in both airtightness and contact resistance. On the other hand, Comparative Examples 1 and 2 were inferior in airtightness and contact resistance because the tube inner surface was smooth. In Comparative Example 3, a special device was required for processing, resulting in a problem of high cost, and contact resistance was also high. Since Comparative Example 4 and 5 used the crimp terminal which is a conventional product, it was inferior to airtightness.

It is a figure which shows an example of embodiment in the tube terminal 1 of this invention. It is process explanatory drawing which shows an example of embodiment of the manufacturing method in the tube terminal 1 of this invention. It is process explanatory drawing which shows an example of embodiment of the manufacturing method in the tube terminal 1 of this invention. It is a top view which shows an example of embodiment in the tube terminal 1 of this invention. It is AB sectional drawing which shows an example of embodiment in the tube terminal 1 of this invention. It is an expanded view which shows an example of embodiment of the pipe | tube 10 which has the helical inner surface fin in the tube terminal 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube terminal 2 Flat processing part 3 Conductor connection part 4 Terminal part 5 Flat pipe inscribed part 6 Bolt hole 7 Electrode 8 Press 9 Spiral inner surface fin 10 Tube 11 with helical inner surface fin Compression processing part 12 Conductor 13 Insulating layer L Pipe axis direction β Twist angle

Claims (5)

A tube terminal having a spiral inner fin. The tube terminal according to claim 1, further comprising a terminal portion and a conductor connection portion. 3. The tube terminal according to claim 1, wherein the tube is made of copper or a copper alloy. In a tube terminal having a spiral inner fin, the inner fin is 20 or more, the height of the inner fin is 0.1 mm or more, and the twist angle β of the inner fin with respect to the tube axis direction is more than 0 degree and less than 90 degrees. The tube terminal according to any one of claims 1 to 3, wherein the tube terminal is provided. 5. The method of manufacturing a tube terminal according to claim 1, wherein the terminal portion is formed by processing a tube having a spiral inner fin into a flat shape.

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