WO2024037623A1

WO2024037623A1 - Integrally stamped cylindrical terminal

Info

Publication number: WO2024037623A1
Application number: PCT/CN2023/113742
Authority: WO
Inventors: 王超
Original assignee: 长春捷翼汽车科技股份有限公司
Priority date: 2022-08-18
Filing date: 2023-08-18
Publication date: 2024-02-22
Also published as: CN218569285U

Abstract

Provided in the present application is an integrally stamped cylindrical terminal, comprising a terminal body, which is integrally stamped and rolled into a cylinder, and a sleeve, which is sleeved on the terminal body; the terminal body comprises a clamping portion, a fixing portion and a connecting portion, which are sequentially connected; the clamping portion is provided with at least two elastic arms at one end thereof, the elastic arms enclose a clamping cavity, the elastic arms have contact portions protruding towards the interior of the clamping cavity, and free ends of the elastic arms are bent outwards to form a horn opening; and one end of the sleeve is sleeved on at least part of the fixing portion, at least two cantilever elastic sheets are provided at the other end of the sleeve, and free ends of the cantilever elastic sheets abut against outer walls of the contact portions. In the integrally stamped cylindrical terminal provided in the present application, the sleeve is sleeved on the terminal body, so that the terminal body can be protected; moreover, the cantilever elastic sheets abut against the outer walls of the contact portions, increasing the elasticity of the elastic arms, and also preventing the elastic arms from becoming less elastic after repeated insertion and removal of a plug-in terminal, thus resulting in a smaller contact area between the plug-in terminal and the cylindrical terminal, an increased resistance, and excessive heat generation.

Description

An integrally stamped cylindrical terminal

Related applications

This application claims priority to the Chinese patent application with application number 202222171823.3 submitted on August 18, 2022, and cites the disclosure content of the above patent application as part of this application.

Technical field

The present application relates to the field of electrical connections, and in particular to an integrally stamped cylindrical terminal.

Background technique

In the field of electrical connections, there are many electrical circuits that need to be connected with terminals. At present, plug-in terminals and cylindrical terminals are usually used to plug into each other to achieve connection, especially on wire harnesses with large current and large wire diameters, such as the current rapid development of new In energy vehicles, the charging nozzle and charging stand for charging the battery have internal terminals with a structure of opposite plug-in terminals and cylindrical terminals. The cylindrical terminal has a clamping cavity surrounded by a plurality of elastic arms, and the clamping cavity can accommodate the insertion of the mating terminal. The elastic arms are elastic and are easily deformed by repeated insertion and removal of the mating terminal. Once deformed, the elastic force exerted by each elastic arm on the mating terminal will become smaller, resulting in a smaller contact area between the mating terminal and the cylindrical terminal. , resulting in large stress at the contact position, increased resistance, excessive heat generation, and an increase in temperature. Especially during high-voltage charging, a rapid increase in temperature can easily cause accidents and endanger life and property safety.

Therefore, a new solution is urgently needed in the existing technology to solve the above problems.

Contents of the invention

This application provides an integrally stamped cylindrical terminal. The cantilever spring piece is in contact with the outer wall of the contact part to protect the elastic arm of the cylindrical terminal, adjust the strength of the mating terminal and the cylindrical terminal, and prevent repeated mating of the mating terminal. After removal and insertion, the elastic arm of the cylindrical terminal is deformed by the external force of removal and insertion, and the elastic force becomes smaller. The contact area between the contact part of the cylindrical terminal and the mating terminal becomes smaller, the contact resistance becomes larger, and the heat generation exceeds the standard.

The technical solution provided by this application is: an integrally stamped cylindrical terminal including: a terminal body that is integrally stamped and curled into a cylindrical shape and a sleeve set on the terminal body;

The terminal body includes a clamping part, a fixing part and a connecting part connected in sequence;

One end of the clamping portion is provided with at least two elastic arms, the elastic arms enclose a clamping cavity, the elastic arms have a contact portion protruding toward the inside of the clamping cavity, and the free end of the elastic arm faces toward the clamping cavity. The outer bend forms a bell mouth;

One end of the sleeve is sleeved with at least part of the fixed part, and the other end is provided with at least two cantilever elastic pieces, and the free end of the cantilever elastic piece is in contact with the outer wall of the contact part.

Optionally, the free end of the cantilever spring piece applies pressure to the outer wall of the contact part, and the value of the pressure is 3N-168N.

Optionally, a conductive wear-resistant layer is provided on at least the inner wall of the contact portion.

Optionally, the terminal body is formed by integrally stamping the plate material and curling it into a cylindrical shape, the elastic arm and the terminal body are integrally stamped and formed; the sleeve is formed by integrally stamping the plate material and curling it into a cylindrical shape. Formed, the cantilever elastic piece and the sleeve are integrally stamped and formed.

Optionally, the sleeve is provided with a cut hole, the cut hole corresponds to the elastic arm one-to-one, and the cantilever elastic piece is arranged in the cut hole.

Optionally, the sleeve is welded to at least part of the fixing part.

Optionally, at least one riveting hole is provided on the fixing part, and riveting wings are provided at corresponding positions of the sleeve, and the riveting wings are riveted into the riveting hole to make the sleeve Fixedly connected to the fixed part.

Optionally, at least one through hole is provided on the fixed part, at least one sealing ring is integrally molded on the outer wall of the fixed part, and a sealing plug is integrally molded on the inner cavity of the fixed part. The sealing ring and the sealing plug Connect via the via.

Optionally, the radial height of the sealing ring is greater than the wall thickness of the sleeve.

Optionally, the shape of the connecting portion is cylindrical, arc-shaped, flat, bowl-shaped, U-shaped or V-shaped.

Optionally, the ratio of the wall thickness of the terminal body to the sleeve is 0.5-2.6.

Optionally, one end of the sleeve close to the cantilever elastic piece is provided with a stop piece that blocks the terminal body.

This application can at least bring the following beneficial effects:

1. The free end of the cantilever spring piece is in contact with the outer wall of the contact part, which strengthens the strength of the mating terminal and the cylindrical terminal, increases the elastic force of the elastic arm, makes the terminal connection tighter, and prevents the elastic arm of the cylindrical terminal from being The deformation of the mating terminal after repeated unplugging and insertion causes the elastic force of the elastic arm to become smaller, the contact area with the mating terminal to become smaller, the resistance to increase, and the heat generation to exceed the standard.

2. The free end of the elastic arm is bent outward to form a bell mouth, which can reduce the impact on the contact part of the elastic arm when the plug terminal is inserted or pulled out of the cylindrical terminal.

3. By providing a wear-resistant conductive layer on the contact part, the surface wear of the contact part can be prevented and the service life of the cylindrical terminal can be extended.

4. The cylindrical terminal is equipped with an integral injection-molded sealing ring and sealing plug, which effectively prevents impurities such as water and dust from entering the connection part from the terminal body and reducing the service life of the connection part and the cable connection point.

Description of drawings

Figure 1 is a schematic structural diagram of an integrally stamped cylindrical terminal according to an embodiment of the present application.

Figure 2 is a schematic structural diagram of the sleeve in the embodiment of the present application.

Figure 3 is a schematic structural diagram of the terminal body in the embodiment of the present application.

Figure 4 is a schematic structural diagram of the clamping cavity and the wear-resistant conductive layer of the terminal body in the embodiment of the present application.

FIG. 5 is a schematic structural diagram of a terminal body with a through hole in an embodiment of the present application.

Figure 6 is a schematic structural diagram of an integrally stamped cylindrical terminal with a sealing ring and a sealing plug injection molded according to an embodiment of the present application.

Figure 7 is a front view of an integrally stamped cylindrical terminal with an injection molded sealing ring and a sealing plug according to the embodiment of the present application.

Figure 8 is a cross-sectional view taken along line A-A in Figure 7 .

Figure 9 is a schematic structural diagram of an integrally stamped cylindrical terminal inserted into a plug-in cavity according to an embodiment of the present application.

FIG. 10A is a schematic structural diagram of a cylindrical connection part of an integrally stamped cylindrical terminal according to an embodiment of the present application.

FIG. 10B is a schematic structural diagram of an arc-shaped connecting portion of an integrally stamped cylindrical terminal according to an embodiment of the present application.

10C is a schematic structural diagram of a flat connecting portion of an integrally stamped cylindrical terminal according to an embodiment of the present application.

FIG. 10D is a schematic structural diagram of a bowl-shaped connecting portion of an integrally stamped cylindrical terminal according to an embodiment of the present application.

Figure 10E is a schematic structural diagram of a U-shaped connecting portion of an integrally stamped cylindrical terminal according to an embodiment of the present application.

10F is a schematic structural diagram of a V-shaped connecting portion of an integrally stamped cylindrical terminal according to an embodiment of the present application.

In the figure, 1-terminal body, 2-sleeve, 11-clamping part, 12-fixed part, 13-connecting part, 111-elastic arm, 112-contact part, 113-flare mouth, 21-cantilever spring piece, 22 -Cut hole, 121-riveting hole, 23-riveting wing, 122-through hole, 3-sealing ring, 4-sealing plug, 114-clamping cavity, 115-conductive wear-resistant layer, 5-shell, 51 -Plug cavity, 24-stop piece.

Detailed ways

The present application will be described in further detail below so that those skilled in the art can implement it according to the text of the description. In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation modes of the present application will now be described with reference to the accompanying drawings.

In the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the limitation Features such as "first", "second", etc. may explicitly or implicitly include one or more of these features. In the description of this application, unless otherwise stated, "plurality" means two or more. In the description of this application, unless otherwise stated, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a direct connection, or an indirect connection through an intermediate medium. For this field, A person of ordinary skill can understand the specific meaning of the above terms in this patent according to the specific circumstances.

As shown in Figures 1, 3, and 4, embodiments of the present application provide an integrally stamped cylindrical terminal, which includes an integrally stamped And curled into a cylindrical terminal body 1 and a sleeve 2 sleeved on the terminal body 1 . The terminal body 1 includes a clamping part 11, a fixing part 12 and a connecting part 13 connected in sequence. One end of the clamping portion 11 is provided with at least two elastic arms 111. The elastic arms 111 surround a clamping cavity 114. The elastic arms 111 have a contact portion 112 protruding toward the inside of the clamping cavity 114. The free ends of the elastic arms 111 are folded outward. Bend to form a bell mouth 113. One end of the sleeve 2 is sleeved with at least part of the fixed part 12 , and the other end is provided with at least two cantilever elastic pieces 21 . The free ends of the cantilever elastic pieces 21 are in contact with the outer wall of the contact part 112 .

As shown in Figures 1, 3, and 4, in order to increase the insertion force between the mating terminal and the cylindrical terminal, a sleeve 2 is provided on the outer wall of the integrally stamped cylindrical terminal body 1. The terminal body 1 includes in sequence The clamping part 11, the fixing part 12 and the connecting part 13 are connected; at least two elastic arms 111 are provided at one end of the clamping part 11, and the sleeve 2 is set on the terminal body 1 to increase the elastic force of the elastic arms 111 and prevent elasticity. After the arm 111 is repeatedly pulled out and inserted into the mating terminal, the elastic force of the elastic arm 111 becomes smaller after deformation, resulting in a smaller contact area between the mating terminal and the cylindrical terminal, an increase in resistance, excessive heat generation, and risks caused by an increase in temperature. When the mating terminal is inserted into the terminal body 1, the bell mouth 113 can guide the mating terminal into the clamping portion 11. The guidance transition provided by the bell mouth 113 can reduce the impact of the end of the mating terminal on the side wall of the elastic arm 111, effectively The wear of the wear-resistant conductive layer on the contact portion 112 is reduced.

In some embodiments, the free end of the cantilever elastic piece 21 exerts pressure on the outer wall of the contact portion 112, and the value of the pressure is 3N-168N.

In order to verify the effect of the free end of the cantilever elastic piece 21 exerting pressure on the outer wall of the contact portion 112 on the connection strength between the sleeve 2 and the terminal body 1, the inventor selected the same terminal body 1, the same mating terminal and different sleeves. Sleeve 2 is tested, and the cantilever spring piece 21 in each sleeve 2 exerts different pressure on the terminal body 1. After the terminal body 1 and the sleeve 2 are sleeved, the plug terminal and the terminal body 1 are plugged together, applying different forces. After 10 consecutive insertions and extractions, check whether the mating terminals have fallen off. If they can fall off, it is unqualified; if the mating terminals cannot fall off and can be pulled out, and the elastic arm 111 has no creases, it is qualified; if the mating terminals cannot be pulled out, it is qualified. , or there are creases on the elastic arm 111, indicating that the pressure is too high, and it is also unqualified. The results are shown in Table 1.

Table 1: The influence of the pressure exerted by the free end of the cantilever spring piece 21 on the outer wall of the contact portion 112 on plugging and unplugging.

As can be seen from Table 1 above, when the pressure exerted by the free end of the cantilever elastic piece 21 on the outer wall of the contact portion 112 is less than 3N At this time, due to the low pressure, the mating terminals are easy to fall off, so they are unqualified. When the pressure exerted by the free end of the cantilever spring piece 21 on the outer wall of the contact portion 112 is greater than 168N, the plug-in terminal cannot be pulled out, and creases are found on the elastic arm 111, so it is unqualified. When the pressure exerted by the free end of the cantilever elastic piece 21 on the outer wall of the contact portion 112 is 3N-168N, the plug-in terminal cannot fall off and can be pulled out, and the elastic arm 111 has no creases, so it is qualified. Therefore, the inventor prefers that the pressure exerted by the free end of the cantilever spring piece 21 on the outer wall of the contact portion 112 is 3N-168N.

In some embodiments, as shown in FIG. 4 , a conductive wear-resistant layer 115 is provided on at least the inner wall of the contact portion 112 . By providing the conductive wear-resistant layer 115, the surface wear of the contact portion 112 can be prevented and the service life of the cylindrical terminal can be extended.

The conductive wear-resistant layer 115 includes a bottom layer and a surface layer. The material of the bottom layer is one or more of gold, silver, nickel, tin, tin-lead alloy and zinc; the material of the surface layer is gold, silver, nickel, tin, tin-lead alloy. , one or more of silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver and silver-gold-zirconium alloy.

The conductive wear-resistant layer 115 is made of one or more of gold, silver, nickel, tin, zinc, tin-lead alloy, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver, and silver-gold-zirconium alloy. The conductive wear-resistant layer 115, as a metal contact in contact with the mating terminal that needs to be frequently plugged and unplugged, needs to have good wear resistance. Therefore, a wear-resistant metal with good wear resistance is selected as the conductive wear-resistant layer 115, which can effectively Greatly increases the service life of the contacts. In addition, the contacts need to have good electrical conductivity. The conductivity and stability of the above-mentioned metals are better than those of copper or copper alloys, which can enable the plug terminals to obtain better electrical properties and longer service life.

In order to demonstrate the impact of different conductive wear-resistant layer 115 materials on the overall performance of the plug terminal, the inventor used cylindrical terminal samples of the same specifications and materials with different conductive wear-resistant layer 115 materials, and used plug-in terminals of the same specifications to make A series of mating and unmating cycles and corrosion resistance time tests. The experimental results are shown in Table 2 below.

The number of plugging and unplugging in Table 2 below is based on fixing the cylindrical terminals on the experimental bench, using mechanical devices to simulate plugging and unplugging of the cylindrical terminals, and after every 100 times of plugging and unplugging, stop and observe the contact of the cylindrical terminals. The conductive wear-resistant layer 115 on the inner wall of the portion 112 is damaged. When the conductive wear-resistant layer 115 on the surface of the cylindrical terminal is scratched and the material of the cylindrical terminal itself is exposed, the experiment is stopped and the number of insertions and withdrawals at that time is recorded. In this embodiment, if the number of plugging and unplugging times is less than 8000, it is considered unqualified.

The conductivity in Table 2 below is after the cylindrical terminal and the mating terminal are plugged into each other, current is passed through the mating terminal, and the conductivity of the corresponding cylindrical terminal is detected. In this embodiment, the conductivity is greater than 99 % is qualified.

Table 2: Effects of different conductive wear-resistant layer 115 materials on the number of insertion and removal times and conductivity of cylindrical terminals

As can be seen from Table 2 above, when the material of the conductive wear-resistant layer 115 is selected to be gold, silver, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver and silver-gold-zirconium alloy, the experimental results exceed the standard value A larger number indicates that the performance of the conductive wear-resistant layer 115 is relatively stable. When the material of the conductive wear-resistant layer 115 is selected as nickel, tin, tin-lead alloy, or zinc, the experimental results can also meet the requirements. Therefore, the inventor chose the material of the conductive wear-resistant layer 115 to be one of gold, silver, nickel, tin, tin-lead alloy, zinc, silver-antimony alloy, palladium, palladium-nickel alloy, graphite silver, graphene silver and silver-gold-zirconium alloy. one or more combinations.

The thickness of the conductive wear-resistant layer 115 has a great influence on the overall performance and life of the cylindrical terminal, and serious adverse effects may cause the product life to be suddenly reduced or even fail. If the thickness of the conductive wear-resistant layer 115 is too small, the wear resistance of the cylindrical terminal does not meet the requirements. If the thickness of the conductive wear-resistant layer 115 is too large, it will easily fall off from the surface of the terminal, causing the wear resistance to decrease, causing the terminal to be inserted into the barrel. The contact area of the shaped terminal becomes smaller and the contact resistance increases, which may cause risks such as fire due to temperature rise. Moreover, the metal of the conductive wear-resistant layer 115 is relatively expensive. Using a thicker conductive wear-resistant layer 115 not only fails to improve performance, but also increases costs, and has no use value.

In order to demonstrate the impact of the thickness of the bottom conductive wear-resistant layer 115 on the overall performance of the cylindrical terminal, the inventor used cylindrical terminal samples with the same specifications and materials, different nickel bottom layer thicknesses, and the same silver surface layer thickness. A series of temperature rise tests and plug-and-pull times tests were performed on the plug-in plug-in. The experimental results are shown in Table 3 below.

The temperature rise test in Table 3 below is to pass the same current through the plugged cylindrical terminal and the mating terminal, and measure the temperature at the same position of the cylindrical terminal before power on and after the temperature is stabilized in a closed environment, and make the difference. Take the absolute value. In this embodiment, a temperature rise greater than 50K is considered unqualified.

The number of plugging and unplugging in Table 3 below is based on fixing the cylindrical terminals on the experimental bench respectively, using mechanical devices to simulate plugging and unplugging of the cylindrical terminals, and after every 100 times of plugging and unplugging, stop and observe the surface of the cylindrical terminals. Destruction of the conductive wear-resistant layer 115. When the conductive wear-resistant layer 115 on the surface of the terminal is scratched and the material of the terminal itself is exposed, the experiment is stopped and the number of insertions and withdrawals at that time is recorded. In this embodiment, if the number of plugging and unplugging times is less than 8000, it is considered unqualified.

Table 3: Effects of different thicknesses of the underlying conductive wear-resistant layer 115 on the temperature rise and number of plugging and unplugging of cylindrical terminals

As can be seen from Table 3 above, when the thickness of the bottom nickel layer is less than 0.01μm, although the temperature rise of the cylindrical terminal is qualified, because the conductive wear-resistant layer is too thin, the number of plugging and unplugging of the cylindrical terminal is less than the qualified value, which does not meet the requirements. The performance requirements of cylindrical terminals have a great impact on the overall performance and life of the mating terminals. In severe cases, it may cause a sudden reduction in product life or even failure and combustion accidents. When the thickness of the bottom nickel layer is greater than 15 μm, the heat generated by the barrel terminal cannot be dissipated due to the thick bottom conductive wear-resistant layer 115. comes out, causing the temperature rise of the cylindrical terminal to fail, and the thicker bottom layer will easily fall off from the surface of the terminal, resulting in a decrease in the number of cycles of corrosion resistance. Therefore, the inventor chooses the thickness of the underlying conductive wear-resistant layer 115 to be 0.01 μm-15 μm. Preferably, the inventor found that when the thickness of the bottom conductive wear-resistant layer 115 is 0.1 μm-9 μm, the comprehensive effect of the temperature rise and the number of plugging and unplugging of the cylindrical terminal is better. Therefore, in order to further improve the safety and reliability of the product itself, For practicality, the thickness of the bottom conductive wear-resistant layer 115 is preferably 0.1 μm-9 μm.

In order to demonstrate the impact of changes in the thickness of the surface conductive wear-resistant layer 115 on the overall performance of the cylindrical terminal, the inventor used cylindrical terminal samples with the same specifications and materials, the same nickel bottom layer thickness, and different silver surface layer thicknesses, using the same specifications. A series of temperature rise and plug-and-pull times tests were conducted on the plug-in terminals. The experimental results are shown in Table 4 below.

The experimental method is the same as the above experimental method.

Table 4: Effects of different surface conductive wear-resistant layer 115 thicknesses on temperature rise and number of plugging and unplugging

As can be seen from Table 4 above, when the thickness of the surface silver layer is less than 0.5 μm, although the temperature rise of the cylindrical terminal is qualified, because the conductive wear-resistant layer 115 is too thin, the number of insertion and withdrawal times of the cylindrical terminal is less than the qualified value, and it is not Complying with the performance requirements of cylindrical terminals has a great impact on the overall performance and life of the plug terminals. In severe cases, it may cause a sudden reduction in product life or even failure and combustion accidents. When the thickness of the surface silver layer is greater than 55 μm, because the underlying conductive wear-resistant layer 115 is thicker, the heat generated by the cylindrical terminal cannot be dissipated, making the temperature rise of the cylindrical terminal unqualified, and the thicker conductive wear-resistant layer 115 will instead It is easy to peel off from the terminal surface, resulting in a decrease in the number of corrosion resistance cycles. Moreover, since the metal of the surface conductive wear-resistant layer 115 is relatively expensive, using a thicker conductive wear-resistant layer 115 will not only fail to improve performance, but also increase costs, and has no use value. Therefore, the inventor chooses the thickness of the surface conductive wear-resistant layer 115 to be 0.1 μm-55 μm.

Preferably, the inventor found that when the thickness of the surface conductive wear-resistant layer 115 is 1 μm-35 μm, the comprehensive effect of the temperature rise and the number of plugging and unplugging of the cylindrical terminal is better. Therefore, in order to further improve the safety, reliability and practicality of the product itself property, the thickness of the surface conductive wear-resistant layer 115 is preferably 1 μm-35 μm.

In some embodiments, the terminal body 1 is formed by integrally stamping a plate material and curling it into a cylindrical shape. The elastic arm 111 and the terminal body 1 are integrally stamped and formed. The sleeve 2 is formed by integrally stamping a plate material and curling it into a cylindrical shape. Formed, the cantilever elastic piece 21 and the sleeve 2 are integrally stamped and formed. The base material of the terminal body 1 and the sleeve 2 is in the form of a sheet. The processing method of stamping and curling the sheet is simple and the process is mature. The terminal body 1 and the sleeve 2 can be produced quickly and in large quantities, saving processing costs and improving production efficiency.

In some embodiments, as shown in FIG. 1 , the sleeve 2 is provided with a cutting hole 22 , the cutting hole 22 corresponds to the elastic arm 111 one-to-one, and the cantilever elastic piece 21 is arranged in the cutting hole 22 .

The sleeve 2 is provided with a cutting hole 22, and a cantilever spring piece 21 is provided in the cutting hole 22. The cantilever spring piece 21 and the cutting hole 22 are integrally formed. There is no need to provide an additional cantilever spring piece 21. The cutting hole 14 corresponds to the elastic arm 111 one by one to ensure that Each elastic arm 111 is contacted by a cantilever elastic piece 21 .

In some embodiments, the sleeve 2 is welded to at least part of the fixing portion 12 .

The sleeve 2 is sleeved on the outer surface of the terminal body 1, and the sleeve 2 is welded to at least part of the fixing portion 12, so that a stable connection is formed between the terminal body 1 and the sleeve 2.

In some embodiments, as shown in Figures 1 and 3, at least one riveting hole 121 is provided on the fixing part 12, and a riveting wing 23 is provided at a corresponding position on the sleeve 2, and the riveting wing 23 is riveted to the riveting hole. 121, so that the sleeve 2 and the fixing part 12 are fixedly connected.

As shown in Figure 1, at least one riveting hole 121 is provided on the circumferential outer surface of the fixing part 12, and the riveting wings 23 are provided at corresponding positions of the sleeve 2. When the sleeve 2 is inserted into the terminal body 1, the riveting wings 23 are riveted. into the riveting hole 121, so that the sleeve 2 is fixedly connected to the fixed part 12, thereby ensuring the accuracy of the installation position of the sleeve 2 on the outer wall of the terminal body 1 and preventing the sleeve 2 from rotating, while ensuring that the sleeve 2 does not It has strong reliability and ensures the stability of terminal connection.

In some embodiments, at least one through hole 122 is provided on the fixing part 12. At least one sealing ring 3 is integrally molded on the outer wall of the fixing part 12, and a sealing plug 4 is integrally molded on the inner cavity of the fixing part. The sealing ring 3 and the sealing plug 4 are connected through the through hole 122. , in other words, the sealing ring 3 and the sealing plug 4 are an integral structure formed in one piece.

As shown in Figures 5, 6, 7 and 8, on the one hand, the sealing plug 4 is formed in the inner cavity of the fixing part 12 through the through hole 122, thereby forming the sealing plug 4, and the sealing plug 4 is against on the inner cavity side wall of the fixed part 12 to seal the inner cavity of the fixed part 12; the sealing ring 3 is molded and wrapped around the outer periphery of the fixed part 12 and the through hole 122, thereby forming an external sealing ring 3 embedded in the through hole 122; sealing The plug 4 and the sealing ring 3 are integrally molded by injection molding, thereby effectively preventing the sealing plug 4 from falling off the terminal body 1 and making the structure more stable. The double seal makes the terminal have high sealing reliability, effectively preventing impurities such as water and dust from entering the connection part from the terminal body 1 and affecting the service life of the connection part 13 and the cable connection point.

In some embodiments, as shown in FIG. 9 , the radial height of the sealing ring 3 is greater than the wall thickness of the sleeve 2 . When the cylindrical terminal is used and inserted into the plug-in cavity 51 of the housing 5, the height of the sealing ring 3 is greater than the wall thickness of the sleeve 2 and abuts against the inner wall of the plug-in cavity 51. On the one hand, it can prevent the outer wall of the sleeve 2 from being in contact with the plug-in cavity 51. The inner wall of the plug cavity 51 is in contact. On the other hand, it can effectively prevent impurities such as water and dust from entering the connection part 13 from the gap after the sleeve 2 is plugged into the plug cavity 51, causing short circuits and leakage accidents. At the same time, the connection part 13 and the line are extended. The service life of the cable connection point.

In a preferred embodiment, the shape of the connecting portion 13 is cylindrical, arc-shaped, flat, bowl-shaped, U-shaped or V-shaped.

As shown in Figures 10A-10F, the cross-sectional shape of the connecting portion 13 is designed into various shapes, which is convenient for designers to design according to the actual terminal According to the layout environment, terminals of different shapes are selected to reduce the volume of the plug-in structure, optimize the contact area, and enhance the electrical performance of the terminal. In addition, the internal cross-section shapes of the terminals are diverse and can match more shapes of mating terminals, providing designers with more choices.

In some embodiments, the ratio of the wall thickness of the terminal body 1 to the sleeve 2 is 0.5-2.6.

The thinner the wall thickness of the terminal body 1 is, the more sufficient elasticity it provides. However, if it is too thin, the elastic arm 111 will be too thin and easily bent. The thicker the wall thickness of the terminal body 1, the sleeve 2 cannot be inserted into the terminal body 1. In order to select a suitable ratio between the wall thickness of the terminal body 1 and the wall thickness of the sleeve 2, the inventor conducted a sleeve test. The test method is selection The sleeve 2 has the same wall thickness and the terminal body 1 has different wall thicknesses. Each terminal body 1 only has a different wall thickness and the other parameters are the same. If there are creases on the elastic arm 111, it is unqualified. If the sleeve 2 cannot be set on the terminal body 1, it is also unqualified. If there are no creases on the elastic arm 111, the sleeve 2 can be set on the terminal body 1. Passed, the test results are shown in Table 5.

Table 5: Comparison of the wall thickness of the terminal body 1 and the sleeve 2 will affect whether the elastic arm will have creases and whether the sleeve 2 can be inserted into the terminal body 1

It can be seen from Table 5 that when the ratio of the wall thickness of the terminal body 1 to the sleeve 2 is less than 0.5, the elastic arm 111 appears creases; when the ratio of the wall thickness of the terminal body 1 to the sleeve 2 is greater than 2.6, the sleeve 2 also If the terminal body 1 cannot be inserted and the terminal body 1 cannot be protected, it is also unqualified; when the ratio of the wall thickness of the terminal body 1 to the sleeve 2 is 0.5-2.6, there will be no creases on the elastic arm 111 and the sleeve 2 can The sleeve is installed on the terminal body 1, and the result is qualified. Therefore, the inventor prefers that the ratio of the wall thickness of the terminal body 1 to the sleeve 2 is 0.5-2.6.

In some embodiments, a stop piece 24 that stops the terminal body 1 is provided at one end of the sleeve 2 close to the cantilever elastic piece 21 .

As shown in Figure 2, one end of the sleeve 2 close to the cantilever elastic piece 21 is provided with a stopper piece 24 that blocks the terminal body, which can stop the terminal body 1 when the sleeve 2 is sleeved on the terminal body 1. effect.

Although the embodiments of the present application have been disclosed above, they are not limited to the applications listed in the description and embodiments. They can be applied to various fields suitable for the present application. For those familiar with the art, they can easily Additional modifications may be made and the application is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and equivalent scope.

Claims

An integrally stamped cylindrical terminal, characterized by comprising: a terminal body integrally stamped and curled into a cylindrical shape and a sleeve set on the terminal body;

The terminal body includes a clamping part, a fixing part and a connecting part connected in sequence;

One end of the clamping portion is provided with at least two elastic arms, the elastic arms enclose a clamping cavity, the elastic arms have a contact portion protruding toward the inside of the clamping cavity, and the free end of the elastic arm faces toward the clamping cavity. The outer bend forms a bell mouth;

One end of the sleeve is sleeved with at least part of the fixed part, and the other end is provided with at least two cantilever elastic pieces, and the free end of the cantilever elastic piece is in contact with the outer wall of the contact part.
An integrally stamped cylindrical terminal according to claim 1, characterized in that the free end of the cantilever spring piece applies pressure to the outer wall of the contact part, and the value of the pressure is 3N-168N.
An integrally stamped cylindrical terminal according to claim 1, characterized in that a conductive wear-resistant layer is provided on at least the inner wall of the contact portion.
An integrally stamped cylindrical terminal according to claim 1, characterized in that the terminal body is formed by integrally stamping a plate and curling it into a cylindrical shape, and the elastic arm and the terminal body are integrally stamped and formed; The sleeve is formed by integrally stamping the plate and curling it into a cylindrical shape, and the cantilever elastic piece and the sleeve are integrally stamped and formed.
An integrally stamped cylindrical terminal according to claim 1, characterized in that the sleeve is provided with a cutout hole, the cutout hole corresponds to the elastic arm, and the cantilever elastic piece is provided at the Inside the cut hole.
An integrally stamped cylindrical terminal according to claim 1, wherein the sleeve is welded to at least part of the fixing part.
An integrally stamped cylindrical terminal according to claim 1, characterized in that at least one riveting hole is provided on the fixing part, and a riveting wing is provided on the corresponding position of the sleeve. Wings are riveted into the riveting holes to securely connect the sleeve to the fixing part.
An integrally stamped cylindrical terminal according to claim 1, characterized in that at least one through hole is provided on the fixing part, and at least one sealing ring is integrally injection molded on the outer wall of the fixing part. A sealing plug is integrally injected into the inner cavity, and the sealing ring and the sealing plug are connected through the through hole.
An integrally stamped cylindrical terminal according to claim 8, characterized in that the radial height of the sealing ring is greater than the wall thickness of the sleeve.
An integrally stamped cylindrical terminal according to claim 1, characterized in that the shape of the connecting portion is cylindrical, arc-shaped, flat, bowl-shaped, U-shaped or V-shaped.
An integrally stamped cylindrical terminal according to claim 1, characterized in that the ratio of the wall thickness of the terminal body to the sleeve is 0.5-2.6.
An integrally stamped cylindrical terminal according to claim 1, wherein one end of the sleeve close to the cantilever elastic piece is provided with a stop piece that blocks the terminal body.