JP2008108528A - Terminal for electric connection, and its resistor formation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal for electric connection capable of effectively preventing generation of arc discharge between a connection object and itself; and its resistor formation method. <P>SOLUTION: Since a resistor 3 covering a tip side of a contact part 2 of this terminal 1 is formed to gradually reduce a resistance value toward the base end side of the contact part 2, the terminal 1 is prevented from being rapidly insulated from a mating terminal 4 by the resistor 3 in extracting the terminal 1 from the mating terminal 4, and generation of arc discharge can be effectively prevented. In this case, since a second resistor layer 3b is formed in a wide range from the upper part of a first resistor layer 3a toward the base end side of the contact part 2, the resistor 3 gradually reduced in thickness from the tip side of the contact part 2 toward the base end side thereof can be easily formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrical connection terminal of a connector used for, for example, wiring of an automobile power supply and a method for forming a resistor thereof.

  In general, a pair of male and female connectors that are fitted to each other are used for wiring of an electric system of an automobile, and the circuit on the electrical component side and the circuit on the power source side are connected by the connector. The terminal of this connector has a conductive contact portion extending in the connecting direction with the counterpart terminal, and is electrically connected to the counterpart terminal when the counterpart terminal contacts the side surface of the contact portion.

  By the way, in recent years, development of automobiles equipped with a high-voltage power supply (42V) has been promoted, and the voltage becomes extremely higher than the current automobile power supply (14V). For this reason, when the connector of the power supply wiring is pulled out, arc discharge is likely to occur between the terminals of each connector, and measures for preventing such arc discharge are required.

Therefore, the tip side of the contact part of the terminal is covered with an insulating resin, and when the connector is pulled out, the terminals are separated from each other with an insulating resin interposed therebetween, thereby preventing arc discharge between the terminals. There is known a connector configured to do this (for example, see Patent Document 1).
JP 2006-256448 A

  However, in the connector, since the conduction between the terminals is suddenly interrupted by the insulating resin when the terminals are pulled out, similarly to the case where the metals of the terminals are separated from each other, arc discharge between the terminals is likely to occur during the insulation. There was a problem.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrical connection terminal and a resistor thereof that can effectively prevent the occurrence of arc discharge with a connection object. It is to provide a forming method.

  In order to achieve the above-mentioned object, the present invention has an electrically conductive contact portion extending in the direction of connection with the connection target, and is electrically connected to the connection target by contacting the connection target with the side surface of the contact portion. The terminal for use includes a resistor that covers the distal end side of the contact portion, and the resistor is formed so that the resistance value gradually decreases from the distal end side to the proximal end side of the contact portion.

  As a result, since the resistance covering the distal end side of the contact portion is formed so that the resistance value gradually decreases toward the proximal end side of the contact portion, when pulling out from the counterpart terminal, There is no sudden insulation between the resistors.

  Moreover, in order to achieve the said objective, this invention has an electroconductive contact part extended in the connection direction with a connection target object, and is connected with a connection target object when a connection target object contacts the side surface of a contact part. In the resistor forming method of forming a resistor covering the distal end side of the contact portion on the electrical connection terminal, the distal end side of the contact portion is immersed in a predetermined resistor liquid so that the distal end side of the contact portion is moved to the proximal end side. After the resistor layer is formed in a predetermined formation area, the tip end side of the contact portion is further immersed in the resistor liquid, so that the top of the resistor layer is closer to the base end side of the contact portion than the formation range. Thus, another resistor layer is formed in a wide formation range.

  As a result, another resistor layer is formed on the inner resistor layer in a wide range toward the proximal end side of the contact portion, so that the thickness gradually increases from the distal end side to the proximal end side of the contact portion. A small resistor is formed.

  According to the electrical connection terminal of the present invention, when being pulled out from the mating terminal, the resistor terminal is not abruptly insulated from the mating terminal, thereby effectively preventing the occurrence of arc discharge. it can.

  Further, according to the resistor forming method for an electrical connection terminal of the present invention, a resistor whose thickness gradually decreases from the distal end side to the proximal end side of the contact portion can be formed. It is possible to easily form a resistor that is not abruptly insulated from the mating terminal when it is pulled out from the substrate, which is extremely advantageous in manufacturing.

  1 to 4 show an embodiment of the present invention. FIG. 1 is a front view of a main part of an electrical connection terminal, FIG. 2 is a front sectional view of the main part, and FIG. 3 is a schematic view showing a test apparatus. FIG. 4 is a front view of an essential part showing an operation of pulling out the electrical connection terminal.

  The electrical connection terminal 1 includes a contact portion 2 extending in a connection direction with a connection object, and a resistor 3 that covers a distal end side (lower end side in the drawing) of the contact portion 2, and is connected to a side surface of the contact portion 2. When the object comes into contact, it is electrically connected to the connection object.

  The contact portion 2 is made of a conductive metal, and the tip end side thereof is formed so as to be gradually tapered. In the present embodiment, only the distal end side of the terminal 1 is illustrated, but the base end side (upper end side in the drawing) is formed in a predetermined shape so that an arbitrary wiring is connected.

  The resistor 3 is formed so that the thickness gradually decreases from the distal end side to the proximal end side of the contact portion 2, whereby the resistance value gradually increases from the distal end side to the proximal end side of the contact portion 2. It is getting smaller. The resistor 3 is obtained by, for example, immersing and drying the tip side of the contact portion 2 in a resistor liquid that is mixed with epoxy and conductive powder (carbon, metal powder, metal flake, etc.) and diluted to a liquid state with a solvent. It is formed. That is, as shown in FIG. 2 (a), the first resistor layer 3a is formed by attaching and drying the resistor liquid in a predetermined first formation range H1 from the tip of the contact portion 2 toward the base end. After the formation, as shown in FIG. 2 (b), a resistor liquid is deposited on the first resistor layer 3a in a predetermined second formation range H2 from the tip of the contact portion 2 toward the base end. The second resistor layer 3b is formed by drying. At this time, the second resistor layer 3b is formed such that the second formation range H2 is wider toward the base end side of the contact portion 2 than the first formation range H1 of the first resistor layer 3a. .

  Next, an experiment was conducted on the occurrence of arc discharge at the terminals using the test apparatus 10 shown in FIG. This test apparatus 10 includes an insertion / extraction tester 11 capable of holding a pair of terminals facing each other vertically and a load power supply device 12 for applying a predetermined voltage to each terminal held by the insertion / extraction tester 11. The testing machine 11 moves one terminal with respect to the other terminal in the insertion / extraction direction at a predetermined speed.

  In this experiment, when a terminal having no resistor 3 according to the present embodiment was first pulled out from the counterpart terminal, it was confirmed that arc discharge occurred between the terminals. Next, when the terminal 1 of this embodiment was pulled out from the counterpart terminal 4, no arc discharge occurred between the terminals 1 and 4. That is, since the terminal 1 of this embodiment has the resistor 3 at the tip end side of the contact portion 2, as shown in FIG. 4 (a), the counterpart terminal 4 is completely in contact with the contact portion 2 of the terminal 1. When it is pulled out from the counterpart terminal 4, the resistor 3 is interposed between the counterpart terminal 4 and the counterpart terminal 4. At that time, since the resistor 3 is formed so that the resistance value gradually decreases toward the base end side of the contact portion 2, the counterpart terminal 4 is connected to the resistor 3 as shown in FIG. Since the resistance value of the resistor 3 is small at the initial stage of contact, the terminals 1 and 4 are not rapidly insulated from each other, and the counterpart terminal 4 is connected to the contact portion 2 of the terminal 1 via the resistor 3. Arcing does not occur even when separated. Thereafter, when the counterpart terminal 4 moves to the tip side of the contact portion 2 as shown in FIG. 4 (c), the resistance value of the resistor 3 increases, and therefore when the counterpart terminal 4 moves away from the resistor 3. Is almost completely insulated between the contact portion 2 of the terminal 1 and the counterpart terminal 4, and no arc discharge occurs between the terminals 1 and 4.

  As described above, according to the electrical connection terminal 1 of the present embodiment, the resistance value of the resistor 3 covering the distal end side of the contact portion 2 of the terminal 1 gradually decreases toward the proximal end side of the contact portion 2. Therefore, when the terminal 1 is pulled out from the mating terminal 4, the terminals 1 and 4 are not rapidly insulated by the resistor 3, and the occurrence of arc discharge can be effectively prevented.

  In addition, since the resistance value of the resistor 3 is decreased by gradually decreasing the thickness of the resistor 3 from the distal end side to the proximal end side of the contact portion 2, resistance is increased in the longitudinal direction of the contact portion 2. The resistor 3 whose value gradually changes can be easily formed.

  In this case, after the first resistor layer 3a is formed in the first formation range H1 from the distal end of the contact portion 2 toward the proximal end side by immersing the distal end side of the contact portion 2 in the resistor liquid, By immersing the distal end side of the contact portion 2 in the resistor liquid, a second formation range H2 wider from the top of the first resistor layer 3a toward the proximal end side of the contact portion 2 than the first formation range H1. Since the second resistor layer 3b is formed on the contact portion 2, it is possible to easily form the resistor 3 whose thickness gradually decreases from the distal end side to the proximal end side of the contact portion 2, and in manufacturing. Very advantageous.

  In the above embodiment, the resistor 3 is formed by the first and second resistor layers 3a and 3b. However, the resistor 3 may be formed by three or more layers.

The principal part front view of the terminal for electrical connection which shows one Embodiment of this invention Front sectional view of the main part of the electrical connection terminal Schematic showing test equipment Front view of main part showing pulling out operation of electrical connection terminal

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electric connection terminal, 2 ... Contact part, 3 ... Resistor, 3a ... 1st resistor layer, 3b ... 2nd resistor layer, H1 ... 1st formation range, H2 ... 2nd formation range .

Claims (3)

In the terminal for electrical connection, which has a conductive contact portion extending in the connection direction with the connection object, and is electrically connected to the connection object by contacting the connection object on the side surface of the contact portion,
Comprising a resistor covering the tip side of the contact portion;
A terminal for electrical connection, wherein the resistor is formed so that the resistance value gradually decreases from the distal end side to the proximal end side of the contact portion. The electrical connection terminal according to claim 1, wherein the resistor is formed such that a resistance value is decreased by gradually decreasing a thickness from a distal end side to a proximal end side of the contact portion. It has a conductive contact portion extending in the direction of connection with the connection object, and covers the distal end side of the contact portion on the terminal for electrical connection that conducts with the connection object when the connection object contacts the side surface of the contact portion. In a resistor forming method for forming a resistor,
After immersing the distal end side of the contact portion in a predetermined resistor liquid, after forming the resistor layer in a predetermined formation range from the distal end of the contact portion toward the proximal end side,
Furthermore, by immersing the distal end side of the contact portion in the resistor liquid, another resistor layer is formed in a wider formation range from above the resistor layer toward the proximal end side of the contact portion than the formation range. A method of forming a resistor for a terminal for electrical connection.

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