CN216413274U

CN216413274U - Copper-aluminum terminal and matching hole structure thereof

Info

Publication number: CN216413274U
Application number: CN202123220409.9U
Authority: CN
Inventors: 李厚琨; 王武军; 毛建伟; 王荣喜; 赵平堂; 王彦波; 杜艳平
Original assignee: Henan THB Electric Co Ltd
Current assignee: Henan THB Electric Co Ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-04-29
Anticipated expiration: 2031-12-21

Abstract

The utility model provides a copper-aluminum terminal and a matching hole structure thereof, which are used for solving the technical problems that the existing copper-aluminum crimping terminal is easy to generate poor contact of a connector, even generates ablation phenomenon, is unstable in crimping and the like. The copper-aluminum terminal comprises a copper head part and an aluminum tail part, and the copper head part and the aluminum tail part are connected through a wrapping shell; the copper head comprises an electric contact part, a contact spring tongue matched with an aluminum lead is arranged in the electric contact part, and the aluminum lead is inserted into the electric contact part of the copper head and is in contact connection with the contact spring tongue; the aluminum tail part comprises a crimping part matched with the aluminum lead, and the aluminum lead is crimped in the crimping part. The utility model has simple structural design, stability and reliability, high vibration resistance and convenient automatic production; the embedded and injection molded wrapping shell can realize good sealing of the connecting part, can avoid electrochemical corrosion of copper-aluminum connecting points, can avoid unstable structure caused by copper-aluminum creep difference, and realizes good electrical connection.

Description

Copper-aluminum terminal and matching hole structure thereof

Technical Field

The utility model relates to the technical field of automobile part manufacturing, in particular to a copper-aluminum terminal and a matching hole structure thereof.

Background

With the development of automobile body lightweight requirements and wire harness technology, automobile wire harnesses are increasingly connected by aluminum-aluminum wires. When the copper terminal is connected with the aluminum-aluminum wire in a compression joint mode, due to the fact that the two media have potential difference, electrochemical corrosion is easy to occur, and poor electric contact is caused, the copper terminal and the aluminum-aluminum wire are connected mostly through ultrasonic welding at present. In the process of wire harness production, the welding technology is mostly operated manually, cannot realize automatic production, and has low production efficiency. The surface of aluminum is very easy to passivate to form a compact and extremely hard oxide layer, and the oxide layer has strong insulating property while protecting the material from cyclic corrosion. Due to the difference of creep deformation between copper and aluminum, stress relaxation is easily caused at the contact part of the copper and the aluminum. Therefore, to achieve a good electrical connection, it is necessary to thoroughly break the oxide layer at the time of crimping. Under the circumstances, it is necessary to design a terminal which can realize automatic production and is well crimped on an aluminum-aluminum wire.

SUMMERY OF THE UTILITY MODEL

The utility model provides a copper-aluminum terminal and a hole matching structure thereof, aiming at the technical problems that the existing copper-aluminum crimping terminal is easy to cause poor contact of a connector, even ablation phenomenon, unstable crimping and the like.

In order to solve the technical problems, the utility model adopts the following technical scheme: a copper-aluminum terminal comprises a copper head part and an aluminum tail part, wherein the copper head part and the aluminum tail part are connected through a wrapping shell; the copper head comprises an electric contact part, a contact spring tongue matched with an aluminum lead is arranged in the electric contact part, and the aluminum lead is inserted into the electric contact part of the copper head and is in contact connection with the contact spring tongue; the aluminum tail part comprises a crimping part matched with the aluminum lead, and the aluminum lead is crimped in the crimping part.

The electric contact part of copper head is square box structure, and the contact spring tongue is located square box structure inside, and the integrative stamping forming of contact spring tongue and square box structure.

The rear end of the electric contact part of copper head backward extension has the copper head to stretch out the tail, and the front end of the crimping portion of aluminium system afterbody extends forward has the aluminium system afterbody to stretch out the head, and the copper head stretches out the tail and the aluminium system afterbody stretches out the head and all forms corresponding connecting portion through ultrasonic bonding, and two connecting portions form the parcel shell through inlaying the injection moulding.

The both sides symmetry of parcel shell is provided with exhibition wing structure, and the upper portion of exhibition wing structure is the exhibition wing of full connection, the lower part is half connection exhibition wing.

The crimping portion of aluminium system afterbody includes integrative stamping forming's big crimping tail and little crimping tail, and big crimping tail is located the rear end of little crimping tail.

And a plurality of pressing ribs which are arranged in a staggered manner in length are radially arranged on the inner wall of the small compression joint tail and are matched with the aluminum conductor.

The two sides of the large crimping tail and the small crimping tail extend upwards to form crimping wings for crimping aluminum conductors, and the crimping wings on the two sides of the small crimping tail are distributed in a staggered mode from front to back.

The butt-matching hole structure comprises a butt-matching hole body which is matched with the copper-aluminum terminal oppositely, a square box positioning boss which is matched with an electric contact part of a copper head part is arranged on the butt-matching hole body, and the copper-aluminum terminal and the electric contact part of the copper head part after the butt-matching hole body is assembled are fixed in the butt-matching hole body through the square box positioning boss.

The counter-matching hole body is also provided with a wing-spreading positioning boss matched with the semi-connection wing-spreading of the wrapping shell, and the copper-aluminum terminal and the semi-connection wing-spreading of the wrapping shell are hung on the wing-spreading positioning boss after the counter-matching hole body is assembled.

Compared with the prior art, the utility model has the beneficial effects that: 1. the structure is reliable and stable, and a high vibration resistance connecting structure is provided. 2. The ultrasonic welding process is integrated into the terminal manufacturing process, and the automatic production of manufacturing the copper terminal aluminum conductor terminal and crimping the terminal wire harness is realized. 3. The small tail part of the aluminum tail part is provided with long and short staggered press ribs and staggered extension wings, and an oxide layer on the surface of aluminum can be punctured after compression joint. 4. The aluminum tail part is in compression joint with the aluminum wire, so that electrochemical corrosion is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a copper header according to the present invention;

FIG. 3 is a schematic view of an aluminum tail of the present invention;

fig. 4 is an assembly view of the terminal and mating hole of the present invention.

In the figure, 1 is a copper head, 11 is a copper head extending tail; 2, a wrapping shell, 21, a full-connection unfolding wing and 22, a half-connection unfolding wing; 3 is an aluminum tail part, 31 is a pressing rib, and 32 is a pressing wing; 4 is to joining in marriage the hole body, 41 is square chest location boss, and 42 is exhibition wing location boss.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Embodiment 1, as shown in fig. 1, the utility model provides a copper-aluminum terminal, which is formed by split stamping, ultrasonic welding, and insert injection molding, and specifically includes a copper head 1 and an aluminum tail 3, where the copper head 1 and the aluminum tail 3 are connected by a wrapping shell 2. The copper head 1 comprises an electric contact part, a contact spring tongue matched with an aluminum lead is arranged in the electric contact part, the aluminum lead is inserted into the electric contact part of the copper head 1 and is in contact connection with the contact spring tongue, and the electric connection between the aluminum lead and the copper head is realized. Preferably, as shown in fig. 2, the electrical contact portion of the copper head 1 is a square box structure, the contact spring tongue is located inside the square box structure, the front end of the contact spring tongue and the bottom wall of the square box structure are integrally formed through stamping, the rear end of the contact spring tongue extends into the square box structure obliquely and backwards, and the structural design facilitates the insertion of an aluminum conductor into the square box structure. The aluminum tail 3 comprises a crimping part matched with the aluminum lead, and the aluminum lead is crimped in the crimping part to realize the electrical connection between the aluminum lead and the aluminum tail.

As a further preferable scheme, a copper head protruding tail 11 extends backwards from the rear end of the electric contact part of the copper head 1, an aluminum tail protruding head extends forwards from the front end of the crimping part of the aluminum tail 3, the copper head protruding tail 11 and the aluminum tail protruding head form corresponding connection parts through ultrasonic welding, and the ultrasonic welding can break oxide layers on the contact surfaces of the copper head and the aluminum tail to form good connection. Two connecting portions that form parcel shell 2 through inlaying the injection moulding, and through inlaying the injection moulding parcel shell that becomes, can realize the good sealed of connecting portion, avoid the copper aluminium tie point to take place electrochemical corrosion, can avoid the unstable structure that copper aluminium creep difference arouses simultaneously.

As shown in fig. 3, the crimping portion of the aluminum tail portion 3 includes a large crimping tail and a small crimping tail which are integrally stamped, and the large crimping tail is located at the rear end of the small crimping tail. And a plurality of pressing ribs 31 which are arranged in a staggered manner in length are radially arranged on the inner wall of the small compression joint tail, and the pressing ribs 31 are matched with the aluminum conductor. The two sides of the large crimping tail and the small crimping tail extend upwards to form crimping wings 32 for crimping aluminum conductors, and the crimping wings 32 on the two sides of the small crimping tail are distributed in a front-back staggered mode. The pressing rib 31 arranged on the small crimping tail and the crimping wings 32 staggered front and back can puncture an oxide layer on the surface of aluminum in the process of crimping the aluminum wire, so that good electrical connection is realized, and the connection reliability is improved.

Embodiment 2, as shown in fig. 4, a mating hole structure includes a mating hole body 4 that is opposite to the copper-aluminum terminal, and the mating hole body is injection molded. The counter-matching hole body 4 is provided with a square box positioning boss 41 matched with the electric contact part of the copper head part 1, and the electric contact part of the copper head part 1 after the copper-aluminum terminal and the counter-matching hole body 4 are assembled is fixed in the counter-matching hole body 4 through the square box positioning boss 41.

The bilateral symmetry of parcel shell 2 is provided with exhibition wing structure, and the upper portion of exhibition wing structure is full-connection exhibition wing 21, the lower part is half-connection exhibition wing 22, full-connection exhibition wing 21 and half-connection exhibition wing 22 integrated into one piece. The counter-matching hole body 4 is provided with a spread wing positioning boss 42 matched with the half-connection spread wing 22 of the wrapping shell 2, and the copper-aluminum terminal and the half-connection spread wing 22 of the wrapping shell 2 are hung on the spread wing positioning boss 42 after the counter-matching hole body 4 is assembled.

In this embodiment, to the square chest location boss that sets up on the joining in marriage the hole body, exhibition wing location boss all can be better fixed copper aluminium terminal, realizes higher vibration resistance.

The other structure is the same as embodiment 1.

The copper head and the aluminum tail are manufactured by punch forming. The copper head and the aluminum tail enter the ultrasonic welding area under the driving of the manufacturing equipment and the tooling, and automatic welding is realized. Then the wrapped shell enters an embedded injection mold to complete injection molding of the wrapped shell. And then, crimping is carried out through automatic crimping equipment, and when the long and short staggered rib and the staggered extending wings are crimped with the aluminum conductor, the oxide layer on the surface of the aluminum is punctured, so that good connection is realized.

The utility model has simple integral structure design, reliable and stable structure, high vibration resistance and convenient automatic production. The oxide layer of the contact surface of the copper head part and the aluminum tail part can be damaged by ultrasonic welding to form good connection; the embedding and injection molding of the wrapping shell can realize good sealing of the connecting part, can avoid electrochemical corrosion of copper and aluminum connecting points, and can avoid unstable structure caused by copper and aluminum creep difference. The aluminum small tail part long and short staggered press rib and the staggered press wing can puncture an aluminum surface oxide layer in the process of pressing and connecting an aluminum wire, so that good electrical connection is realized, and the connection reliability is improved. The fixed terminal that the hole is provided with exhibition wing location boss, square chest location boss can be better is joined in marriage, realizes higher vibration resistance.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A copper aluminum terminal is characterized in that: the device comprises a copper head (1) and an aluminum tail (3), wherein the copper head (1) and the aluminum tail (3) are connected through a wrapping shell (2); the copper head (1) comprises an electric contact part, a contact spring tongue matched with an aluminum lead is arranged in the electric contact part, and the aluminum lead is inserted into the electric contact part of the copper head (1) and is in contact connection with the contact spring tongue; the aluminum tail part (3) comprises a crimping part matched with an aluminum lead, and the aluminum lead is crimped in the crimping part.

2. The copper-aluminum terminal of claim 1, wherein: the electric contact part of copper head (1) is square box structure, and the contact spring tongue is located inside the square box structure, and the contact spring tongue and the square box structure are integrally formed by punching.

3. The copper-aluminum terminal according to claim 1 or 2, characterized in that: the rear end of the electric contact part of copper head (1) extends backward and has the copper head to stretch out tail (11), and the front end of the crimping part of aluminium system afterbody (3) extends forward and has the aluminium system afterbody to stretch out the head, and the copper head stretches out tail (11) and aluminium system afterbody to stretch out the head and all forms corresponding connecting portion through ultrasonic bonding, and two connecting portions are through inlaying the formation parcel shell (2) of moulding plastics.

4. The copper-aluminum terminal of claim 3, wherein: the bilateral symmetry of parcel shell (2) is provided with exhibition wing structure, and the upper portion of exhibition wing structure is full connection exhibition wing (21), the lower part is half connection exhibition wing (22).

5. The copper-aluminum terminal according to claim 1, 2 or 4, characterized in that: the crimping portion of aluminium system afterbody (3) includes integrative stamping forming's big crimping tail and little crimping tail, and big crimping tail is located the rear end of little crimping tail.

6. The copper-aluminum terminal of claim 5, wherein: the inner wall of the small compression joint tail is radially provided with a plurality of pressing ribs (31) which are arranged in a staggered manner in length, and the pressing ribs (31) are matched with the aluminum conductor.

7. The copper-aluminum terminal of claim 6, wherein: the two sides of the large crimping tail and the small crimping tail extend upwards to form crimping wings (32) for crimping the aluminum conductor, and the crimping wings (32) on the two sides of the small crimping tail are distributed in a staggered mode from front to back.

8. A mating hole structure, comprising: the copper-aluminum terminal comprises a matching hole body (4) matched with the copper-aluminum terminal in an opposite mode, the matching hole body (4) is provided with a square box positioning boss (41) matched with an electric contact part of the copper head (1), and the electric contact part of the copper head (1) is fixed in the matching hole body (4) through the square box positioning boss (41) after the copper-aluminum terminal and the matching hole body (4) are assembled.

9. The mating hole structure of claim 8, wherein: the counter-matching hole body (4) is further provided with a spread wing positioning boss (42) matched with the half-connection spread wing (22) of the wrapping shell (2), and the copper-aluminum terminal and the half-connection spread wing (22) of the wrapping shell (2) are hung on the spread wing positioning boss (42) after the counter-matching hole body (4) is assembled.