JP2004076882A - Alloy wire fastening method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To connect a shape memory alloy or a superelastic alloy wire with one kind of connecting terminal and to make the structure of the connecting terminal so that after the connecting terminal is mounted on a printed substrate, the alloy wire can be staked down. <P>SOLUTION: The alloy wire and the connecting terminal are substantially perpendicular in relation. A housing groove of the connecting terminal for connecting to the alloy wire is V-shaped. The wire is fastened to the connecting terminal of a softer metallic material than the alloy. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an alloy wire locking method for joining a shape memory alloy or a superelastic alloy to another member with a simple configuration in a power mechanism using a shape memory alloy or a superelastic alloy as an actuator.
[0002]
[Prior art]
Since the easiest control method for changing the shape of the shape memory alloy is an electric heating method, when an attempt is made to use the shape memory alloy as a power source of various mechanical devices, the connection between the shape memory alloy and a connection terminal for supplying an electric current is required. Joining was essential. However, when the shape memory alloy is attached to the connection terminal by brazing or welding, the shape memory alloy is liable to cause fatigue failure, so that it has been impossible to solder with a shape memory alloy such as Ti-Ni. Similarly, in the case of a shape memory alloy that can be soldered, similarly, it is difficult to solder the shape memory alloy to the connection terminal due to a change in shape due to heat or a loss of the memory shape. Even when a superelastic alloy is attached to a connection terminal by brazing or welding, the superelastic alloy is liable to cause fatigue failure, and thus cannot be attached by soldering, brazing, welding, or the like.
[0003]
Hereinafter, a description will be given of a method of locking other members mainly with a conventional shape memory alloy.
In FIG. 4, 1 is a shape memory alloy wire or a superelastic alloy wire, and 4 is a conductive connection terminal. A shape memory alloy wire is inserted into the sleeve of the connection terminal, and the sleeve is pressed and crimped. By the above method, the shape memory alloy wire 1 and the connection terminal 4 are electrically connected, and the shape memory alloy wire 1 can be controlled to be energized.
[0004]
However, in the above configuration, in the relationship between the sleeve and the wire diameter of the shape memory alloy wire that sandwich the shape memory alloy wire provided on the connection terminal, the sleeve diameter is larger in structure, so that some play can be performed, It was difficult to perform the caulking work with high accuracy. Furthermore, it is necessary to prepare connection terminals in accordance with the diameter of the shape memory alloy wire.
[0005]
In addition, the conventional connection terminal, when the connection terminal is attached to a printed circuit board or the like, since the conventional connection terminal is parallel to the shape memory alloy wire, there is almost no gap for caulking work between the connection terminal and the printed circuit board, It was necessary to join the shape memory alloy wire and the connection terminal in advance. However, in a power mechanism using a shape memory alloy as an actuator, it is necessary to adjust the length of the shape memory alloy wire in order to utilize the expansion and contraction of the length of the shape memory alloy wire. Adjustment of the mounting position on the substrate was required. Furthermore, since the conventional connection terminal is parallel to the shape memory alloy wire, the vertical projection area of the connection terminal with respect to the printed circuit board is increased, so that the substrate area is disadvantageously increased.
[0006]
[Problems to be solved by the invention]
The problem to be solved is to allow one type of connection terminal to join with shape memory alloy wires having different wire diameters, and to caulk the shape memory alloy wire after attaching the connection terminal to a printed circuit board or the like. That is.
[0007]
[Means for Solving the Problems]
According to the present invention, the shape groove is expanded in a V-shape to enable joining regardless of the wire diameter of the shape memory alloy wire, and the shape memory alloy wire is caulked after the connection terminal is attached to a printed circuit board or the like. The main feature is that the shape memory alloy wire and the connection terminal are in a substantially right angle relationship in order to make the structure workable.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
In the shape memory alloy connection terminal according to the present embodiment, the groove for accommodating the shape memory alloy wire is widened in a V shape, and the shape memory alloy wire and the connection terminal are in a substantially right-angled relationship. It is a softer metal than an alloy.
[0009]
FIG. 1 is a perspective view showing a locked state between a shape memory alloy wire and a connection terminal according to the first embodiment of the present invention. In FIG. 1, 1 is a shape memory alloy wire or a superelastic alloy wire, 2 is a connection terminal, and 3 is a printed circuit board.
[0010]
As shown in FIG. 1, the shape memory alloy wire is hooked into the receiving groove of the connection terminal, and the crimped portion is pressed and compressed. However, since the connection terminal is softer than the alloy, the wire can be joined without damaging the wire. Compared with the conventional connection terminal, the connection terminal is substantially perpendicular to the shape memory alloy wire, so that the shape memory alloy wire can be caulked after the connection terminal is mounted on a printed board or the like, and the mounting surface of the printed board is Can be reduced in the vertical projection area. Further, since the receiving groove of the connection terminal is widened in a V-shape, locking is possible regardless of the diameter of the shape memory alloy wire.
[0011]
(2nd Embodiment)
This embodiment is the same as the configuration of the first embodiment except that it has two V-shaped grooves for accommodating a shape memory alloy wire.
[0012]
FIG. 2 is a perspective view showing a locked state of a shape memory alloy wire and a connection terminal according to a second embodiment of the present invention. In FIG. 2, 1 is a shape memory alloy wire or a superelastic alloy wire, 2 is a connection terminal, and 3 is a printed circuit board.
[0013]
As shown in FIG. 2, the shape memory alloy wire is hooked on the accommodation groove on one side of the connection terminal, then the shape memory alloy wire is wound around the support post of the connection terminal, inserted into the accommodation groove on the other side, and press-fitted by crimping. Let it. In the second embodiment, the tensile strength can be made higher than that of the first embodiment by performing a crimping process by winding a shape memory alloy. Further, in this structure, since the two accommodation grooves are provided, there is no portion where the shape memory alloy wire and the caulking tool are in direct contact, so that the wire is not damaged.
[0014]
(Third embodiment)
In this embodiment, the terminal tip is vertically divided into three parts, and the middle one of the three divided terminals and the two outer divided terminals are bent back and forth in opposite directions to expand the split and form a V-shaped accommodation groove. Is formed, and after the alloy wire is reciprocated, the alloy wire is locked to the terminal by returning the split terminal bent back and forth.
[0015]
FIG. 3 is a perspective view showing a locked state of a shape memory alloy wire and a connection terminal according to a third embodiment of the present invention. In FIG. 3, 1 is a shape memory alloy wire or a superelastic alloy wire, 2 is a connection terminal, and 3 is a printed circuit board.
[0016]
As shown in FIG. 3, after the shape memory alloy wire is reciprocally inserted into the middle divided terminal of the connection terminal, the divided terminal bent back and forth is returned to the original state, so that the alloy wire is locked to the connection terminal. The present embodiment is different from the second embodiment in that a split is widened and a V-shaped accommodation groove is formed later, but locking is possible regardless of the wire diameter of the shape memory alloy wire. Since the connection terminal is substantially perpendicular to the shape memory alloy wire, the shape memory alloy wire can be caulked after the connection terminal is mounted on a printed circuit board or the like, and the vertical projection area with respect to the mounting surface of the printed circuit board can be reduced. Can be.
[0017]
The present invention has been described based on the embodiments. It should be understood by those skilled in the art that this embodiment is illustrative and that various modifications are possible, and that such modifications are also within the scope of the present invention. Such modified examples are described below.
[0018]
This is a modification in which the direction in which the accommodation groove of the second embodiment spreads in a V-shape as shown in FIG. 5 is set to the same direction as the insertion direction of the connection terminal.
[0019]
This is an example in which the direction in which the accommodation groove of the second embodiment spreads in a V-shape as shown in FIG. 6 is set to be substantially perpendicular to the insertion direction of the connection terminal.
[0020]
An example in which one of the two accommodation grooves of the second embodiment is set so that one of them extends in a V-shape in the same direction as the insertion direction of the connection terminal and the other in the direction opposite to the insertion direction of the connection terminal as shown in FIG. It is.
[0021]
In the third embodiment, as shown in FIG. 8, the outer two divided terminals are left as they are, and only the middle divided terminal is bent backward.
[0022]
In the third embodiment, as shown in FIG. 9, a middle split terminal is left as it is, and one of the outer split terminals is bent forward and the other is bent backward.
[0023]
【The invention's effect】
As described above, the connection terminal of the shape memory alloy according to the present invention can be locked to the connection terminal regardless of the wire diameter of the shape memory alloy wire, and the shape memory after the connection terminal is attached to a printed circuit board or the like. Since the alloy wire can be crimped, the efficiency of the mounting work can be significantly improved, it can be applied to shape memory alloys that cannot be soldered, and it has the excellent effect that it can be electrically connected very easily. It is obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a locked state of a shape memory alloy wire and a connection terminal according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a connection between a shape memory alloy wire and a connection terminal according to a second embodiment of the present invention. FIG. 3 is a perspective view showing a stopped state. FIG. 3 is a perspective view showing a locked state of a shape memory alloy wire and a connection terminal in a third embodiment of the present invention. FIG. 4 is a conventional shape memory not using the present invention. It is a perspective view which shows the connection state of an alloy wire and a connection terminal.
FIG. 5 is a perspective view of a housing groove according to a second embodiment of the present invention, in which a direction in which the connection groove extends in a tapered shape is set to a direction opposite to an insertion direction of the connection terminal of the connection terminal.
FIG. 6 is a perspective view of a housing groove according to a second embodiment of the present invention, in which a direction in which the housing terminal is expanded in a tapered shape is set substantially perpendicular to a direction in which the connection terminal is inserted into the connection terminal.
FIG. 7 shows two receiving grooves of the second embodiment of the present invention, one of which extends in a tapered shape in the same direction as the insertion direction of the connection terminal, and the other in the direction opposite to the insertion direction of the mounting portion of the connection terminal. FIG.
FIG. 8 is a perspective view of a third embodiment of the present invention, in which two outer divided terminals are left as they are, and only a middle divided terminal is bent backward.
FIG. 9 is a perspective view of a third embodiment of the present invention in which one of the outer divided terminals is bent toward the front and the other is bent rearward while leaving the middle divided terminal as it is.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shape memory alloy wire 2 Connection terminal 3 Printed circuit board 4 Conventional connection terminal

Claims (3)

The alloy wire and the connection terminal have a substantially right-angled relationship, the receiving groove for connecting the alloy wire in the connection terminal is V-shaped, and the material of the connection terminal is a metal softer than the alloy. Alloy wire locking method When the alloy wire is wound around the column of the connection terminal and joined to obtain a large tensile strength, a V-shaped accommodation groove for accommodating the alloy wire is provided so that a part of the alloy wire does not directly touch the caulking tool. 2. The method according to claim 1, further comprising: After the terminal tip is vertically divided into three parts, one or two of the three divided terminals are bent back and forth to expand the split to form a V-shaped accommodation groove, and then insert the alloy wire back and forth. An alloy wire locking method characterized by locking the alloy wire to the terminal by returning the split terminal bent back and forth.

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