CN216773524U - SMA wire end component - Google Patents

Abstract

The utility model discloses an SMA wire end component which comprises an electric connection plate, an SMA wire and a reinforcing plate, wherein the SMA wire is electrically connected to the electric connection plate, an SMA wire protection area is formed on the electric connection plate around a certain area of the SMA wire, the reinforcing plate is superposed on the electric connection plate and covers at least one part of the SMA wire protection area, and the reinforcing plate is fixedly connected with the electric connection plate. The SMA wire end component disclosed by the utility model separates the electric connection and the fixed phase of the SMA wire, so that the conduction and the fixing effects are respectively ensured, the product performance is improved, the process difficulty is reduced, meanwhile, the fixing of the plate is enhanced, the fixing strength of the SMA wire is enhanced, particularly, the peeling resistance strength of the SMA wire is enhanced, and the integral connection effect of the SMA wire end component is improved.

Description

SMA wire end component

Technical Field

The utility model relates to the technical field of shape memory alloys, in particular to an SMA wire end component.

Background

Shape memory alloy (shape memory alloy, abbreviated as SMA) is a material made of more than two metal elements and has shape memory effect (shape memory effect, abbreviated as SME) through thermal elasticity, martensite phase transformation and inversion thereof, SMA can deform at a lower temperature and can restore the shape before deformation after being electrified and heated, so that electric control contraction can be realized, and SMA wires are commonly used as driving elements in actuating devices.

At present, the SMA wire is generally assembled and fixed by using the clamping jaw and the electric connection between the SMA wire and the clamping jaw is realized, that is, the electric connection between the SMA wire and the clamping jaw is realized while the clamping jaw is clamped outside the SMA wire. However, the existing clamping jaw connection mode has the following defects: firstly, the SMA wire is clamped in the clamping jaw, the electric connection effect between the two is difficult to ensure, and the contact resistance between the two can be changed due to the clamping tightness, the surface treatment condition of a contact surface and the micro-sliding of the SMA wire after being stressed, and the contact resistance cannot be directly inspected; secondly, the fixing of the SMA wire is realized by cladding of a welding material, and the mode has better tensile strength and torsional strength in a plane (in the axial direction of the SMA wire), but has poorer peel strength in the direction staggered in the axial direction of the SMA wire; thirdly, before connection, the insulating layer on the surface of the SMA wire is required to be removed, and the insulating layer is generally removed by adopting modes of laser, plasma ablation and the like so as to ensure the electric connection effect of clamping, so that the process cost is increased, and the risk of damage to the SMA wire is increased; electroplating is required to be carried out on the contact part of the clamping jaw and the SMA wire so as to improve the electric connection effect, so that the material cost is increased; fifthly, the fixation and the conduction are realized in the same process, the process difficulty is high, the yield is low, and the large-scale mass production is difficult to realize quickly.

Therefore, there is a need to provide an SMA wire terminal assembly with simple process, which can separate the fixing and conducting processes of the SMA wire and improve the product performance, so as to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an SMA wire terminal assembly which has a simple process, can separate the fixing process and the conducting process of an SMA wire and improve the product performance.

In order to achieve the purpose, the technical scheme of the utility model is as follows: the SMA wire end component comprises an electric connecting plate, an SMA wire and a reinforcing plate, wherein the SMA wire is electrically connected to the electric connecting plate, an SMA wire protection area is formed on the electric connecting plate around a certain area of the SMA wire, the reinforcing plate is overlapped on the electric connecting plate and covers at least one part of the SMA wire protection area, and the reinforcing plate is fixedly connected with the electric connecting plate.

Preferably, the electric connection plate is further formed with a connection area, the connection area includes at least a part of the SMA wire protection area, and the reinforcing plate is overlapped and fixed on the connection area.

Preferably, a protective layer wrapping the SMA wire is formed in the SMA wire protective area, a connecting layer is formed in the connecting area, and the reinforcing plate is fixed with the electric connecting plate through the connecting layer.

Preferably, the protective layer and the connecting layer are formed by the same material at one time, or formed by different materials respectively.

Preferably, the SMA wire is stacked on one side surface of the electrical connection plate, at least a part of the stacked part between the SMA wire and the electrical connection plate is electrically connected to form an electrical connection area, and the part of the SMA wire spaced from the electrical connection plate or the part of the SMA wire protruding out of the electrical connection plate forms an outlet terminal, and the SMA wire protection area includes the outlet terminal and at least a part of the electrical connection area.

Preferably, the reinforcing plate is further provided with a connecting portion, and the reinforcing plate is further fixed with the electric connecting plate through the connecting portion.

Preferably, the connecting portion includes a step structure disposed along an edge of the reinforcing plate or/and a through hole opened in the reinforcing plate or/and a groove, and a fixing structure wrapped outside the step structure or/and a fixing structure filled in the through hole or/and the groove are formed between the electrical connection plate and the reinforcing plate.

Preferably, the fixing structure is formed by glue or solder.

Preferably, the SMA wire and the electric connection plate are electrically connected by at least one of resistance welding, brazing, laser welding and ultrasonic welding; the reinforcing plate and the electric connection plate are fixed through at least one of gluing, resistance welding, brazing, laser welding, ultrasonic riveting, bending and heating.

Preferably, the reinforcing plate is molded by any one of a metal material, a plastic material, and an inorganic material.

Preferably, the SMA wire is a bare wire, or the SMA wire includes a wire core and an insulating film/insulating layer coated outside the wire core, where the insulating film/insulating layer is at least coated on an effective working portion of the SMA wire, where the effective working portion is a portion capable of causing the SMA wire to generate an effective phase change, for example, when the SMA wire is in contact with or very close to the electrical connection plate, or when the SMA wire is in contact with glue or the like, the phase change of the SMA wire is affected, and a portion of the SMA wire other than the contact portion or the close portion is a portion capable of generating an effective phase change.

Preferably, the electrical connection board and the reinforcing board are provided by at least one material tape.

Compared with the prior art, the SMA wire end component disclosed by the utility model has the advantages that after the SMA wire is electrically connected to the electric connecting plate, the reinforcing plate is overlapped on the electric connecting plate and fixedly connected with the electric connecting plate, and the reinforcing plate at least covers the SMA wire protection area, so that the connection of the SMA wire and the electric connecting part and the fixation of the SMA wire, the electric connecting plate and the reinforcing plate are separated, the process difficulty is reduced, the connection and fixation effects of the SMA wire are respectively ensured, and the performance of a product is greatly improved; secondly, the reinforcing plate is superposed and fixed on the electric connecting plate, so that the peeling strength of the SMA wire in the axial direction of the SMA wire is enhanced, and the overall connecting effect of the SMA wire terminal assembly is improved; moreover, whether the SMA wire is provided with an insulating layer or not is not required to be distinguished, namely, whether the SMA wire is provided with the insulating layer or not can be directly and electrically connected with the electric connection plate, and the insulating layer of the SMA wire with the insulating layer is not required to be removed firstly, so that the damage risk of removing the insulating layer to the SMA wire is avoided, the forming process is simplified, the electric connection effect is improved, and the strength and the fatigue life of the SMA wire are also enhanced.

Drawings

Fig. 1 is a top view of an electrical connection plate in a first embodiment of the utility model after it has been connected to SMA wire.

Fig. 2 is a top view of the electrical connection board of fig. 1 after a connection layer is formed thereon.

Fig. 3 is a top view of a group of SMA wire terminals in a first embodiment of the utility model.

Fig. 4 is a cross-sectional view of fig. 1.

Fig. 5 is a cross-sectional view of fig. 2.

Fig. 6 is a cross-sectional view of fig. 3.

Fig. 7 is a schematic view of an alternative embodiment of fig. 1.

Fig. 8a is a schematic structural diagram of an alternative embodiment of the SMA wire tip set of fig. 6.

Fig. 8b is a schematic structural diagram of another alternative embodiment of the SMA wire tip set of fig. 6.

Fig. 8c is a schematic structural diagram of yet another alternative embodiment of the SMA wire tip set of fig. 6.

Fig. 9 is a top view of an electrical connection plate connected to SMA wire in a second embodiment of the utility model.

Fig. 10 is a sectional view of fig. 9.

Fig. 11 is a cross-sectional view of an SMA wire tip assembly in a second embodiment of the utility model.

Fig. 12 is a cross-sectional view of a SMA wire tip set in a third embodiment of the utility model.

Fig. 13 is a top view of an electrical connection plate in a third embodiment of the utility model after attachment to SMA wire.

Fig. 14 is a top view of a group of SMA wire terminals in a third embodiment of the utility model.

Fig. 15 is a cross-sectional view of an SMA wire tip assembly in a fourth embodiment of the utility model.

Fig. 16 is a top view of a group of SMA wire terminals in a fourth embodiment of the utility model.

Fig. 17 is a cross-sectional view of an SMA wire tip assembly in a fifth embodiment of the utility model.

Fig. 18 is a cross-sectional view of an SMA wire tip assembly in a sixth embodiment of the utility model.

Detailed Description

Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements. It should be noted that the orientation descriptions of the present invention, such as the directions or positional relationships indicated above, below, left, right, front, rear, etc., are all based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the technical solutions of the present application or/and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be interpreted as limiting the present application. The description of first, second, etc. merely serves to distinguish technical features and should not be interpreted as indicating or implying a relative importance or implying a number of indicated technical features or implying a precedence relationship between indicated technical features.

The present invention is directed to a method for separating a fixed connection and an electrical connection of a Shape Memory Alloy (SMA) wire and a resulting tip assembly, and the SMA wire tip assembly 100 of the present invention will be described in detail below with reference to fig. 1 to 18.

Referring first to fig. 1-18, the SMA wire terminal assembly 100 of the present invention includes an electrical connection plate 110, an SMA wire 120, and a reinforcing plate 130. The number of the electrical connection plate 110, the number of the SMA wires 120, and the number of the stiffener plate 130 may be one or more, and are not particularly limited in the present invention. When the number of the electric connection plate 110, the SMA wire 120 and the reinforcing plate 130 is one, the SMA wire 120 is clamped between the electric connection plate 110 and the reinforcing plate 130 which are overlapped, meanwhile, the SMA wire 120 is electrically connected with the electric connection plate 110, and the reinforcing plate 130 is fixed on the electric connection plate 110 to reinforce the fixation of the SMA wire 120; when at least one of the electrical connection plate 110 and the reinforcing plate 130 is multiple, one of the electrical connection plate 110 and the reinforcing plate 130 is stacked in sequence, and the SMA wire 120 is still clamped and fixed between the adjacent electrical connection plate 110 and one reinforcing plate 130 and is electrically connected with the electrical connection plate 110; when there are a plurality of SMA wires 120, the plurality of SMA wires 120 are sandwiched and fixed between an adjacent electrical connection plate 110 and a reinforcing plate 130, and the SMA wires 120 are electrically connected in the same manner as the single SMA wire 120. According to the utility model, through the arrangement of the reinforcing plate 130, the fixing strength of the SMA wire 120 can be improved, and particularly the peeling strength of the SMA wire 120 after being fixed is improved.

In the present invention, after the SMA wire 120 is fixed between the electrical connection plate 110 and the reinforcing plate 130, the SMA wire 120 may be led out at both ends or only in one direction, which is flexibly selected according to specific product requirements and does not affect the function and effect of the SMA wire terminal assembly 100 of the present invention.

Again, as shown in connection with fig. 1-18, the structure of the SMA wire 120 itself is not particularly limited in the present invention. Specifically, the SMA wire 120 may have only a core and no insulation layer, i.e., the SMA wire 120 is a bare wire; the cable core can also be provided with a cable core and an insulating layer wrapped outside the cable core, and the insulating layer can wrap the whole cable core or only wrap a part of the cable core.

When the SMA wire 120 is a bare wire, it can be directly soldered, heated, or otherwise electrically connected to the electrical connection plate 110. When the SMA wire 120 includes the wire core and the insulating layer, the electrical connection can be realized by welding, heating or other methods, and the insulating layer of the SMA wire 120 can be crushed or heated to be melted in the process, so that the SMA wire 120 is electrically connected with the electrical connection plate 110, and therefore, even if the SMA wire 120 has the insulating layer, the insulating layer does not need to be specially removed before the SMA wire 120 is connected with the electrical connection plate 110, the process is saved, the risk of damage to the SMA wire 120 caused by the removal of the insulating layer is avoided, the electrical connection effect of the SMA wire 120 is ensured, and the strength and the fatigue life of the SMA wire 120 are enhanced.

Referring to fig. 1-18, different embodiments of the SMA wire terminal assembly 100 of the present invention will be described in detail, respectively, using the SMA wire 120 as a bare wire and the number of the electrical connection plates 110, the SMA wire 120, and the stiffener plate 130 as an example.

Referring first to fig. 1-6, in a first embodiment of the SMA wire terminal assembly 100 of the present invention, it includes an electrical connection plate 110, an SMA wire 120, and a reinforcing plate 130. The electrical connection plate 110 and the reinforcing plate 130 are both planar plate structures, the SMA wire 120 is stacked on one side surface of the electrical connection plate 110, and both ends of the SMA wire 120 protrude out of the electrical connection plate 110, that is, the SMA wire 120 is an outgoing wire at both ends, and at least a part of the stacked part between the two is electrically connected to form an electrical connection region 120a, see fig. 4. Meanwhile, an SMA wire protection region 111 is formed on the electrical connection plate 110 around a certain area of the SMA wire 120, where the SMA wire protection region 111 includes at least a portion of the electrical connection region 120a and the outlet end 120b of the SMA wire 120, and preferably includes all of the electrical connection region 120a and the outlet end 120 b. The wire outlet end 120b is a part of the SMA wire 120 spaced from the electrical connection plate 110 or a part of the SMA wire 120 protruding out of the electrical connection plate 110.

In addition, a connection region 112 is further formed on the electrical connection plate 110, the area of the connection region 112 is larger than that of the SMA wire protection region 111, the connection region 112 includes at least a portion of the SMA wire protection region 111, the reinforcing plate 130 is overlapped on the connection region 112, and then the reinforcing plate 130 is fixedly connected with the electrical connection plate 110. At this time, the reinforcing plate 130 is pressed against at least a part of the SMA wire protection region 111, and the part of the reinforcing plate 130 pressed against the SMA wire protection region 111 mainly protects the SMA wire 120, and the part of the reinforcing plate 130 beyond the SMA wire protection region 111 is fixed to the electrical connection plate 110, so that the fixing strength of the SMA wire 120 is enhanced by the reinforcing plate 130, and the fixing strength of the SMA wire 120, particularly the peeling strength of the SMA wire 120, can be improved.

Referring to fig. 1-4, the electrical connection board 110 has a first length in the first direction X and a second length in the second direction Y, and the first length and the second length may be the same or different. In the present embodiment, the electrical connection board 110 is substantially rectangular, and therefore, the first length is greater than the second length. The SMA wire 120 is overlapped on one side of the electrical connection plate 110, and the axis of the SMA wire 120 extends along the first direction X, and the overlapped parts of the SMA wire and the SMA wire form an electrical connection area 120a, that is, the length of the electrical connection area 120a is equal to the first length of the electrical connection plate 110, as shown in fig. 4 specifically; then, the SMA wire 120 and the electrical connection plate 110 are electrically connected at the electrical connection region 120a, and after the electrical connection is completed, an electrical connection layer 140 is formed therebetween, as shown in fig. 4 to 6, that is, the SMA wire 120 and the electrical connection plate 110 are electrically connected through the electrical connection layer 140.

Of course, according to different requirements of electrical connection strength, the SMA wire 120 may be electrically connected to a portion of the overlapped portion of the electrical connection plate 110, as shown in fig. 7, where the length of the electrical connection region 120a is smaller than the first length of the electrical connection plate 110.

It is understood that the SMA wire 120 is only schematically drawn in one extending direction in this embodiment, and the axial direction of the SMA wire 120 may extend in the second or other directions.

With reference to fig. 1 and 4, in this embodiment, the SMA wire 120 and the electrical connection plate 110 are welded by at least one of resistance welding, laser welding and ultrasonic welding, after the welding is completed, the electrical connection layer 140 is formed between the SMA wire 120 and the electrical connection plate 110, and the SMA wire 120 is fixed by the electrical connection layer 140 and is electrically connected to the electrical connection plate 110. Particularly, by adopting the welding method, for the SMA wire 120 with the insulating layer, the insulating layer of the SMA wire 120 can be damaged or melted under pressure or high temperature, so that the SMA wire 120 and the electrical connection plate 110 are welded to form the electrical connection layer 140, therefore, before the SMA wire 120 is connected with the electrical connection plate 110, the insulating layer is not required to be specially removed, the process is saved, the risk of damage to the SMA wire 120 caused by removing the insulating layer is also eliminated, the electrical connection effect of the SMA wire 120 is ensured, and the strength and the fatigue life of the SMA wire 120 are enhanced.

Of course, the manner of electrical connection between the SMA wire 120 and the electrical connection plate 110 is not limited to the foregoing manner, and other electrical connection manners may be selected according to needs.

Referring again to fig. 1-4, in the present embodiment, the SMA wire protecting area 111 is an area extending along the axial direction of the SMA wire 120 and having a certain width, such as the area shown by the rectangular box in fig. 1-2, and the SMA wire protecting area 111 completely includes the electrical connection area 120a and the outlet end 120b, so that the SMA wire protecting area 111 completely includes the electrical connection layer 140 shown in fig. 4. In this embodiment, the area of the connection region 112 is smaller than or equal to the area of the electrical connection plate 110, and the connection region 112 includes a part of the SMA wire protection region 111, specifically, includes a part of the SMA wire protection region 111 overlapping with the electrical connection region 120a, or includes a part of the SMA wire protection region 111 except for the wire outlet 120b, as shown in fig. 2. The reinforcing plate 130 is overlapped on the connecting region 112 and fixed to the electrical connecting plate 110, so that the portion of the reinforcing plate 130 covering the SMA wire 120 protects the SMA wire 120 and enhances the fixing strength, especially the peeling strength, of the SMA wire 120, as shown in fig. 3.

The size of the stiffener 130 is not particularly limited in the present invention, and the area thereof may be larger than, equal to, or smaller than the area of the electrical connection plate 110, as long as it is ensured that it can completely cover the aforementioned connection region 112.

Referring to fig. 2-3 and 5-6 again, in this embodiment, a protective layer 150 completely wrapping the SMA wire 120 is formed in the SMA wire protective area 111, and the protective layer 150 is used to protect the SMA wire 120; meanwhile, a connecting layer 160 is formed in the connecting region 112, and the connecting layer 160 is used to fix the reinforcing plate 130, so that at least a portion of the connecting layer 160 overlaps with the connecting layer 150. Typically, to save cost, protective layer 150 of SMA wire 120 is molded from one material in SMA wire protective region 111 and tie layer 160 is molded from another material in tie region 112, since the temperature resistance requirements of protective layer 150 are different than the requirements of tie layer 160. Of course, it is also possible to form a material layer having both protective and connecting functions at one time from the same material in the SMA wire protective area 111 and the connecting area 112.

Reference is now made to fig. 7, which illustrates another situation in which the connection area 112 contains a portion of the SMA wire protection area 111, in such a way that the connection area 112 covers only half of the electrical connection plate 110 in the first direction X, while covering the whole of the electrical connection plate 110 in the second direction Y; when the connecting layer 160 is formed on the connecting region 112, the connecting layer 160 covers only approximately half of the SMA wire protecting region 111 (indicated by a dashed box in fig. 7). Therefore, to achieve protection of the SMA wire 120, the portion 111a of the SMA wire protection area 111 not covered by the connection layer 160 is continuously coated with a protection material to form the protection layer 150, and the material of the protection layer 150 may be the same as or different from that of the connection layer 160, as described above.

With continued reference to fig. 1-6, the outlet terminal 120b of the present embodiment will be described. Specifically, since the electrical connection plate 110 is a planar plate-shaped structure, a section of the SMA wire 120 protruding out of the electrical connection plate 110 forms the outlet end 120b, as shown in fig. 4, the length of the outlet end 120b is preferably greater than or equal to 0.1 times the diameter of the SMA wire 120, and more preferably 0.1 to 30 times the diameter of the SMA wire 120, and the protective layer 150 is preferably completely wrapped around the outlet end 120b of the SMA wire 120, in this embodiment, the protective layer 150 and the connection layer 160 of the SMA wire 120 are formed by the same material, as shown in fig. 2 to 3 and fig. 5 to 6, so as to achieve the above-mentioned protective effect. Of course, the protection layer 150 and the connection layer 160 of the SMA wire 120 may be formed by different materials to achieve the purpose of cost saving.

As shown in fig. 1 to 6, in the present embodiment, the reinforcing plate 130 is formed by any one of a metal material, a plastic material, and an inorganic material (e.g., glass), but the material is not limited thereto. The reinforcing plate 130 serves to increase the fixing strength of the SMA wire 120, particularly the peeling strength of the SMA wire 120 in the direction crossing the axial direction thereof, and thus may be made of any material that can achieve the above-mentioned object.

Accordingly, the connection layer 160 may be formed by glue or solder, and thus, the reinforcing plate 130 may be fixed to the electrical connection plate 110 by gluing, or may be fixed to the electrical connection plate 110 by at least one of resistance welding, soldering, laser welding, and heating, which are conventional in the art and will not be described in detail, and the soldering is described in detail later. The heating method is only suitable for the case that the stiffener 130 is made of metal, for example, the stiffener 130 is connected to solder/solder by a heating process, such as in the form of hotbar.

It is to be understood that the reinforcing plate 130 is not limited to be fixed to the electrical connection plate 110 by the connection layer 160, and for example, in other embodiments, the reinforcing plate and the electrical connection plate may be fixed to each other by ultrasonic caulking, bending, or the like.

Referring to fig. 8a-8c, in the present invention, the outlet end 120b is not limited to the position defined in fig. 1-6, and the outlet end 120b may be formed by other structures, for example, as follows:

in an alternative embodiment shown in fig. 8a, two ends of the electrical connection board 110 in the first direction respectively form a chamfer 113 in an inclined structure, the chamfer 113 is disposed on the same side of the electrical connection board 110, and in the thickness direction of the electrical connection board 110, the chamfer 113 is inclined downward from the side of the electrical connection board 110, so that after the SMA wire 120 is electrically connected to the electrical connection board 110, a space is formed between the SMA wire 120 and the chamfer 113, a portion of the SMA wire 120 corresponding to the chamfer 113 is defined as the wire outlet end 120b, and the protective layer 150 completely wraps the wire outlet end 120 b.

In another alternative embodiment shown in fig. 8b, two ends of the electrical connection board 110 in the first direction are respectively recessed with a groove 114, the groove 114 penetrates through two ends of the electrical connection board 110, after the SMA wire 120 is fixed to the electrical connection board 110, two ends of the SMA wire 120 pass over the groove 114 and protrude outside the electrical connection board 110, at this time, the SMA wire 120 is spaced from the bottom of the groove 114, in this embodiment, a section of the SMA wire 120 corresponding to the groove 114 is defined as the wire outlet 120b, and the protective layer 150 is filled in the groove 114, so that the protective layer 150 can completely wrap the wire outlet 120b of the SMA wire 120.

In yet another alternative embodiment shown in fig. 8c, two ends of the electrical connection board 110 in the first direction are respectively bent, so that two ends of the electrical connection board 110 respectively have a bent portion 115 bent downward, after the SMA wire 120 is fixed to the electrical connection board 110, two ends of the SMA wire 120 pass over the two bent portions 115 and protrude outside the electrical connection board 110, at this time, the SMA wire 120 and the bent portion 115 are also spaced apart, in this embodiment, a section of the SMA wire 120 corresponding to the bent portion 115 is defined as the wire outlet 120b, and the protective layer 150 is formed on the bent portion 115, so that the protective layer 150 can completely wrap the wire outlet 120b of the SMA wire 120.

Note that in the embodiment shown in fig. 8a-8c, both the protective layer 150 and the connecting layer 160 are formed from the same material.

Referring now to fig. 9-11, in a second embodiment of the present invention, the main differences from the first embodiment described above are only: the SMA wire 120 and the electrical connection plate 110 are electrically connected by soldering, and the specific manner of soldering will be described in detail below.

Referring to fig. 9-10, for the way of making electrical connection by soldering, the SMA wire 120 is first placed on one side of the electrical connection plate 110, in this embodiment, the axial direction of the SMA wire 120 is made to extend along the length direction (first direction X) of the electrical connection plate 110, then the electrical connection plate 110 is coated with the solder along the SMA wire 120, and the solder covers the SMA wire 120, for example, the solder 140a is sprayed along the SMA wire 120, and the solder 140a covers the SMA wire 120, so that the electrical connection layer 140 is formed between the SMA wire 120 and the electrical connection plate 110, thereby achieving the electrical connection with the electrical connection plate 110, as shown in fig. 11, which is the most efficient in production. Or, the SMA wire 120 is firstly placed on one side surface of the electrical connection plate 110, the axial direction of the SMA wire 120 is also made to extend along the length direction of the electrical connection plate 110, as shown in fig. 9 to 10, then a brazing material (for example, a solder paste) is dotted on the electrical connection plate 110 and covers the SMA wire 120, and then hot air is blown to the brazing material to form the electrical connection layer 140 between the SMA wire 120 and the electrical connection plate 110, as shown in fig. 11, so as to electrically connect the SMA wire 120 to the electrical connection plate 110, which is the lowest cost.

For example, the strength of the method may be optimized by forming a pad by pre-applying solder on one side of the electrical connection plate 110, placing the SMA wire 120 on the pad, and then heating the SMA wire 120 and the electrical connection plate 110 to electrically connect the two through the pad.

Referring to fig. 9-11 again, in this embodiment, after the electrical connection between the SMA wire 120 and the electrical connection plate 110 is completed, the connection layer 160 may be reused to fix the reinforcing plate 130 on the electrical connection plate 110, wherein the forming manner of the connection layer 160 and the fixing manner of the reinforcing plate 130 are the same as those in the first embodiment, and therefore, the description is not repeated. In this manner of additionally fixing the reinforcing plate 130, the resulting SMA wire end assembly 100 is also constructed in the same manner as in the first embodiment described above.

Referring to fig. 9 to 11 again, in the present embodiment, due to the manner of soldering, solder is added, and besides the solder realizes the electrical connection between the SMA wire 120 and the electrical connection plate 110, the solder can be added to form a plate-shaped structure with a certain thickness and a certain size above the electrical connection layer 140 or the solder joint between the SMA wire 120 and the electrical connection plate 110, and the plate-shaped structure is used as the reinforcing plate 130, that is, the reinforcing plate 130 in the present embodiment is directly formed by the solder, as shown in fig. 11.

In a third embodiment of the present invention, shown below in conjunction with fig. 12-14, the main differences between the SMA wire termination assembly 100 and the first embodiment described above are: the reinforcing plate 130 has a different structure.

In this embodiment, the reinforcing plate 130 is provided with a connecting portion 131, and the reinforcing plate 130 further reinforces the fixation with the electrical connection plate 110 through the connecting portion 131. Specifically, the connection portion 131 is a step structure disposed along an edge of the reinforcing plate 130, after the reinforcing plate 130 is stacked on the electrical connection plate 110, the reinforcing plate 130 and the electrical connection plate are fixed by the connection layer 160, and a fixing structure 170 is formed outside the step structure, the fixing structure 170 completely covers the step structure and connects the connection layer 160, and the fixing structure 170 and the connection layer 160 are preferably formed by the same material, but may also be formed by different materials. The connection portion 131 and the fixing structure 170 are disposed to further enhance the fixing strength between the reinforcing plate 130 and the electrical connection plate 110, and further enhance the fixing strength of the SMA wire 120, especially to enhance the peeling strength of the SMA wire 120.

In the present embodiment, the fixing structure 170 and the connecting layer 160 are preferably formed by glue or solder, but not limited thereto, and of course, other materials with adhesive function may be used for forming the fixing structure and the connecting layer.

With continued reference to fig. 12 and 14, in the present embodiment, the step structure is formed at the edge of the stiffener 130 by etching, extruding, bending, injection molding, etc., and the step structure can ensure that the position and height of the connection layer 160 are controllable; in addition, the step structure is beneficial to laser welding, resistance welding, ultrasonic welding and the like, because the welding mode requires that two welding objects are closely connected and the welding thickness is also required, and the step structure can just meet the requirements.

In this embodiment, the structure of the other parts of the SMA wire end assembly 100 is the same as that in the first embodiment, and in addition, the electrical connection mode between the SMA wire 120 and the electrical connection plate 110 may be any one of the first and second embodiments, which is not described again. It should be noted that fig. 12-14 are mainly for illustrating the structure of the stiffener 130 and the fixing manner of the stiffener 130 and the electrical connection plate 110, and therefore, the same portions as those in the first and second embodiments are not shown in fig. 12-14, for example, the connection layer 160 covers the portion of the SMA wire 120 where the wire outlet 120b is covered.

Referring now to fig. 15-16, in a fourth embodiment of the present invention, the structure of the SMA wire termination assembly 100 differs from that of the third embodiment mainly in that: the reinforcing plate 130 has a different structure.

In this embodiment, the reinforcing plate 130 is also provided with the connecting portion 131, but the connecting portion 131 is a through hole or/and a groove opened on the reinforcing plate 130, such as two through holes in the manner shown in fig. 15, and the number of the through holes or/and the grooves is not limited to that in fig. 15-16. After the reinforcing plate 130 is fixed on the electrical connection plate 110 by the connection layer 160, the through hole or/and the groove is filled with glue or solder to form the fixing structure 170, and the fixing structure 170 is connected to the connection layer 160, so that the fixing strength between the reinforcing plate 130 and the electrical connection plate 110 is enhanced by the fixing structure 170, and further, the fixing strength of the SMA wire 120 is enhanced, and particularly, the peeling strength of the SMA wire 120 is enhanced.

In this embodiment, through holes or/and grooves are processed on the reinforcing plate 130 by etching, punching, injection molding, and the like, and are used for being fixedly connected with the SMA wire 120 and the electrical connection plate 110, and the fixing manner may be gluing, laser welding, ultrasonic riveting, brazing, resistance welding, and the like. And the fixing structure 170 is preferably formed of the same material as the connection layer 160, but not limited thereto.

Referring now to fig. 17, in a fifth embodiment of the present invention, the structure of the SMA wire end assembly 100 differs from that in the first embodiment mainly in that: the SMA wire 120 further includes an SMA wire protecting layer 122, that is, the SMA wire 120 has a wire core 121 and an SMA wire protecting layer 122 wrapped outside the wire core 121, and the SMA wire protecting layer 122 is configured to mainly play a role of shock absorption and buffering on the SMA wire 120 and reduce the influence of stress on the SMA wire 120, where the SMA wire protecting layer 122 is different from an insulating layer.

It should be noted that the way of providing the SMA wire protecting layer 122 in this embodiment is mainly applicable to the embodiment where the SMA wire 120 is a bare wire (only having the wire core 121), and the SMA wire protecting layer 122 may be formed by a manufacturer before the SMA wire terminal assembly 100 is attached, or the SMA wire 120 having the SMA wire protecting layer 122 may be purchased directly. In addition, for the SMA wire 120 having an insulation layer, the SMA wire protection layer 122 in this embodiment is an optional structure, because the insulation layer has a certain damping and buffering effect, so that whether to set the SMA wire protection layer 122 may be selected according to specific needs, and when set, the SMA wire protection layer 122 is set outside the insulation layer.

The structure and the forming manner of the other parts of the SMA wire end assembly 100 in this embodiment are the same as those in the first embodiment described above, and the description thereof will not be repeated.

Referring now to fig. 18, in a sixth embodiment of the present invention, the structure of the SMA wire end assembly 100 differs from that in the first embodiment mainly in that: the SMA wire 120 further comprises an insulating film 123, the insulating film 123 wrapping at least the active working portion of the SMA wire 120 for insulating the SMA wire 120.

In this embodiment, the effective working portions of the SMA wire 120 are: the SMA wire 120 can be caused to produce a portion of the effective phase change. Specifically, when the SMA wire 120 is in contact with other components, a contact portion and a non-contact portion are formed on the SMA wire 120, and the phase change of the SMA wire 120 is affected, so that the non-contact portion on the SMA wire 120 can generate effective phase change, and thus the non-contact portions form the effective working portion. Where specific reference is made herein to contact, this includes direct contact as well as infinite proximity.

Specifically, in this embodiment, when the SMA wire 120 is in contact with or very close to the electrical connection plate 110, or when the SMA wire 120 is in contact with glue or the like, the contact or close parts on the SMA wire 120 are the aforementioned contact portions, the parts of the SMA wire 120 other than the contact portions are the non-contact portions, that is, the parts capable of generating effective phase change, and the non-contact portions form the effective working portions thereof, and the effective working portions are wrapped with an insulating film 123, specifically referring to fig. 18, the insulating of the SMA wire 120 is realized by the insulating film 123.

With continued reference to fig. 18, in the present embodiment, the SMA wire 120 is sandwiched and fixed between the electrical connection plate 110 and the reinforcing plate 130, so that the portion fixed between the electrical connection plate 110 and the reinforcing plate 130 forms the aforementioned contact portion, the portion of the SMA wire 120 protruding out of the connection plate 110 and the reinforcing plate 130 forms the effective working portion, and the insulating film 123 wraps at least the effective working portion of the SMA wire 120.

Referring again to fig. 1 to 18, in the above embodiments of the present invention, the SMA wire 120 is used as a bare wire, and for the mode in which the SMA wire 120 is used as a bare wire, in order to insulate the SMA wire 120, in addition to the above-described mode in which the insulating film 123 is provided, other metal parts that may be in contact with the SMA wire 120 on a product including the SMA wire terminal assembly 100 may be insulated.

It should be noted that, although the SMA wire 120 is used as a bare wire in the above embodiments, for the embodiment in which the SMA wire 120 has an insulating layer, that is, the SMA wire 120 includes a wire core and an insulating layer wrapped around the wire core, the structure and connection manner of the SMA wire end assembly 100 may be the same as those in any of the above embodiments shown in fig. 1 to 17, and therefore, the description is not repeated. In addition, since the SMA wire 120 itself already has an insulating layer, it is not necessary to provide an insulating film as shown in fig. 18.

Referring again to fig. 1-18, the electrical connection board 110 and the stiffener board 130 of the SMA wire end assembly 100 of the present invention can be provided by at least one tape, and the tape is utilized for mass production. Specifically, when the electrical connection board 110 and the stiffener 130 are provided by a tape, the tape has a plurality of plates, the stacked stiffener 130 and the electrical connection board 110 are formed by directly bending the plates, and then the stacked electrical connection board 110 and stiffener 130 are fixedly connected. When the electrical connection board 110 and the stiffener 130 are provided by two or more material tapes, the material tapes providing the stiffener 130 are stacked on the material tapes providing the electrical connection board 110, the stiffener 130 is stacked on the electrical connection board 110 in a one-to-one correspondence manner, and then the stacked electrical connection board 110 and stiffener 130 are fixedly connected. Thereby realizing multi-point continuous batch fixing and welding, and improving the connection efficiency of the SMA wire end assembly 100.

In summary, according to the SMA wire end assembly 100 of the present invention, after the SMA wire 120 is electrically connected to the electrical connection board 110, the reinforcing board 130 is stacked on the electrical connection board 110 and is fixedly connected to the electrical connection board 110, and the reinforcing board 130 at least covers the SMA wire protection area 111, so that the conduction of the SMA wire 120 and the electrical connection portion 131 and the separation of the SMA wire from the stationary phases of the electrical connection board 110 and the reinforcing board 130 are achieved, which not only reduces the process difficulty, but also ensures the conduction and the fixing effects of the SMA wire 120, thereby greatly improving the performance of the product; secondly, the reinforcing plate 130 which is overlapped and fixed on the electric connection plate 110 strengthens the peeling strength of the SMA wire 120 in the axial direction thereof, and improves the overall connection effect of the SMA wire terminal assembly 100; moreover, whether the SMA wire 120 is provided with an insulating layer or not is not required to be distinguished, namely, whether the SMA wire 120 is provided with the insulating layer or not can be directly and electrically connected with the electric connection plate 110, and the insulating layer of the SMA wire 120 with the insulating layer is not required to be removed firstly, so that the damage risk of removing the insulating layer to the SMA wire 120 is avoided, the forming process is simplified, the electric connection effect is improved, and the strength and the fatigue life of the SMA wire 120 are also enhanced.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims (12)

1. The SMA wire end component is characterized by comprising an electric connecting plate, an SMA wire and a reinforcing plate, wherein the SMA wire is electrically connected to the electric connecting plate, an SMA wire protection area is formed on the electric connecting plate around a certain area of the SMA wire, the reinforcing plate is superposed on the electric connecting plate and covers at least one part of the SMA wire protection area, and the reinforcing plate is fixedly connected with the electric connecting plate.

2. The SMA wire end assembly of claim 1, wherein said electrical connection plate further has a connection region formed thereon, said connection region including at least a portion of said SMA wire protection region, said reinforcing plate overlying and secured to said connection region.

3. The SMA wire end assembly of claim 2, wherein the SMA wire protection region is formed with a protection layer covering the SMA wire, and the connection region is formed with a connection layer, and the reinforcing plate is fixed to the electrical connection plate through the connection layer.

4. The SMA wire end assembly of claim 3, wherein the protective layer and the connecting layer are formed in one piece from the same material or are formed separately from different materials.

5. The SMA wire terminal assembly of any one of claims 1-4, wherein the SMA wire is stacked on one side of the electrical connection plate, at least a portion of the stacked portion of the two is electrically connected to form an electrical connection area, and a portion of the SMA wire spaced from the electrical connection plate or protruding from the electrical connection plate forms an outlet, the SMA wire protection area comprising the outlet and at least a portion of the electrical connection area.

6. The SMA wire terminal assembly of any one of claims 1-3, wherein the reinforcing plate is further provided with a connecting portion, and the reinforcing plate is further fixed with the electrical connecting plate through the connecting portion.

7. The SMA wire end assembly of claim 6, wherein the connecting part comprises a step structure arranged along the edge of the reinforcing plate or/and a through hole or/and a groove opened on the reinforcing plate, and a fixing structure wrapped outside the step structure or/and a fixing structure filled in the through hole or/and the groove is formed between the electric connecting plate and the reinforcing plate.

8. The SMA wire end assembly of claim 7, wherein the securing structure is formed by glue or solder.

9. The SMA wire terminal assembly of any one of claims 1-4, wherein the SMA wire is electrically connected to the electrical connection plate by at least one of resistance welding, brazing, laser welding, and ultrasonic welding; the reinforcing plate and the electric connection plate are fixed through at least one of gluing, resistance welding, brazing, laser welding, ultrasonic riveting, bending and heating.

10. The SMA wire end assembly of any one of claims 1-4, wherein the reinforcing plate is formed from any one of a metallic material, a plastic material, an inorganic material.

11. The SMA wire terminal assembly of any one of claims 1-4, wherein the SMA wire is a bare wire, or the SMA wire comprises a wire core and an insulating film/layer covering the wire core, the insulating film/layer covering at least the active working portion of the SMA wire.

12. The SMA wire end assembly of any one of claims 1-4, wherein the electrical connection plate, the stiffener plate, are provided by at least one strip of material.

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