A type of enameled wire connector terminal

Abstract

This invention discloses an enameled wire connection terminal, relating to the field of electrical connector technology. The enameled wire connection terminal includes a main body and two elastic clamping arms. The two elastic clamping arms are spaced apart at one end of the main body, forming a clamping area for the enameled wire to enter between the two elastic clamping arms. Each elastic clamping arm includes a large arm, a small arm, and an opening groove formed between the large arm and the small arm. The upper part of the large arm is connected to the main body, and the lower inner side of the large arm is connected to the lower outer side of the small arm. The upper outer side of the small arm is provided with a limiting protrusion extending towards the large arm. The limiting protrusion is configured to cooperate with the inner side of the large arm when the small arm deforms towards the large arm to limit the deformation stroke of the small arm, thereby improving the clamping stability and electrical connection reliability of the enameled wire caused by excessive deformation of the small arm.

Description

Technical Field

[0001] This invention relates to the field of electrical connector technology, and in particular to an enameled wire connector terminal. Background Technology

[0002] Enamelled wire connectors are typically used to establish an electrical connection between an enamelled wire and an outer conductor. Since an enamelled wire consists of an inner conductor and an outer enamel coating, the enamel coating on an enamelled wire connector usually needs to be broken through by puncturing, flattening, or clamping during use to allow the connector to form an electrical connection with the inner conductor of the enamelled wire.

[0003] Existing enameled wire connectors typically have elastic clamping arms for holding the enameled wire. These arms deform elastically due to the reverse compressive force of the enameled wire during the insertion of the terminal into the terminal slot and the crimping process. To ensure electrical connection stability, the elastic clamping arms must continue to hold the enameled wire after piercing the enamel coating, maintaining stable contact between the terminal and the enameled wire conductor.

[0004] However, in elastic clamping structures that include a large arm and a small arm, the small arm typically bears the responsibility of clamping and pressing the enameled wire. When the enameled wire connection terminal is inserted into the terminal slot and the enameled wire is crimped, the small arm is prone to excessive deformation towards the large arm under the compression of the enameled wire. This makes it difficult to control the flattening depth of the enameled wire, and may even cause plastic deformation of the small arm, resulting in a decrease in elasticity. Consequently, this affects the clamping stability of the enameled wire and the reliability of the electrical connection.

[0005] Therefore, how to improve the clamping stability and electrical connection reliability of enameled wires due to excessive deformation of the forearm is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide an enameled wire connection terminal that can improve the clamping stability and electrical connection reliability of enameled wires affected by excessive deformation of the forearm.

[0007] To achieve the above objectives, the present invention provides an enameled wire connector terminal, comprising a main body and two elastic clamping arms. The two elastic clamping arms are spaced apart at one end of the main body, and a clamping area for the enameled wire to enter is formed between the two elastic clamping arms. Each elastic clamping arm includes a large arm, a small arm, and an opening groove formed between the large arm and the small arm. The upper part of the large arm is connected to the main body, and the lower inner side of the large arm is connected to the lower outer side of the small arm. The upper outer side of the small arm is provided with a limiting protrusion extending towards the large arm. The limiting protrusion is configured to cooperate with the inner side of the large arm when the small arm deforms towards the large arm to limit the deformation stroke of the small arm.

[0008] In one possible implementation, the limiting protrusion is formed by partial stamping of the forearm, and the thickness of the limiting protrusion is less than the thickness of the unstamped area of ​​the forearm.

[0009] In one possible implementation, the other end of the main body is connected to an electrical contact part for electrical connection with an external conductor.

[0010] In one possible implementation, the main body has locking buckle protrusions on both sides, which are used to engage with the terminal slots that accommodate the enameled wire.

[0011] In one possible implementation, the outer side of the boom is provided with an assembly guide section, which is used to guide and cooperate with the inner wall of the terminal slot when the enameled wire connection terminal is inserted into the terminal slot that accommodates the enameled wire.

[0012] In one possible implementation, the assembly guide section includes an upper assembly guide section disposed on the outer side of the upper part of the main arm, or the assembly guide section includes an upper assembly guide section disposed on the outer side of the upper part of the main arm and a lower assembly guide section disposed on the outer side of the lower part of the main arm.

[0013] In one possible implementation, when the assembly guide section includes an upper assembly guide section and a lower assembly guide section, the gap between the upper assembly guide sections of the two elastic clamping arms is the same as the gap between the lower assembly guide sections of the two elastic clamping arms.

[0014] In one possible implementation, the bottom of the main body is provided with a retaining boss extending between the two elastic clamping arms, the retaining boss being used to prevent the plastic-coated material from entering the clamping area.

[0015] In one possible implementation, the glue-blocking boss is formed by partial stamping of the main body; and / or, the lower part of the glue-blocking boss has an arc-shaped cross-section.

[0016] In one possible implementation, the inner surface of the forearm is provided with a guide section, a piercing tip, a flattening section and a clamping section in sequence from the side away from the main body to the side closer to the main body. The gap between the guide sections of the two forearms, the gap between the flattening sections and the gap between the clamping sections gradually decrease along the entry direction of the enameled wire.

[0017] Compared to existing technologies, the technical solution provided by this invention has at least the following beneficial effects: Each elastic clamping arm includes a large arm, a small arm, and an opening groove formed between the large arm and the small arm, allowing the small arm to elastically deform when clamping the enameled wire; simultaneously, a limiting protrusion extending towards the large arm is provided on the upper outer side of the small arm. When the small arm deforms towards the large arm under the compression of the enameled wire, the limiting protrusion can cooperate with the inner side of the large arm, thereby limiting the deformation stroke of the small arm. This design can prevent the small arm from excessively deforming due to excessive force, ensure the clamping depth of the small arm on the enameled wire, improve the elasticity reduction caused by plastic deformation of the small arm, and thus improve the clamping stability of the enameled wire and the reliability of the electrical connection. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the enameled wire connection terminal provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the enameled wire connection terminal provided in an embodiment of the present invention from another perspective. Figure 3 This is a schematic diagram of the enameled wire in a flattened state according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the enameled wire in a clamped state provided in an embodiment of the present invention.

[0020] in: 110-Electrical connection part, 120-Main body, 131-Upper arm, 132-Lower arm, 133-Opening groove, 134-Limiting protrusion, 140-Clamping buckle protrusion, 151-Upper assembly guide section, 152-Lower assembly guide section, 160-Glue-blocking boss, 171-First guide section, 172-Second guide section, 180-Piercing tip, 190-Flattened section, 200-Clamping section, 210-Enameled wire. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the protection scope of the present invention.

[0022] In the description of this invention, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and do not indicate or imply that the relevant structure must have a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] It should be noted that the enameled wire 210 in this embodiment includes an inner conductor and an outer enamel coating. The enameled wire connection terminal is an insulated displacement connection terminal, which can pierce the enamel coating and form an electrical connection with the conductor through a crimping operation without pre-stripping the enamel coating.

[0024] Please see Figures 1 to 4 This application provides an enameled wire connection terminal, which can be an integral structure. The enameled wire connection terminal includes a main body 120 and two elastic clamping arms. The two elastic clamping arms are spaced apart at one end of the main body 120, and a clamping area for the enameled wire 210 to enter is formed between the two elastic clamping arms. Each elastic clamping arm includes a large arm 131 and a small arm 132, and an opening groove 133 formed between the large arm 131 and the small arm 132. The upper part of the large arm 131 is connected to the main body 120, and the lower inner side of the large arm 131 is connected to the lower outer side of the small arm 132. The upper outer side of the small arm 132 is provided with a limiting protrusion 134 extending towards the large arm 131. The limiting protrusion 134 is configured to cooperate with the inner side of the large arm 131 when the small arm 132 deforms towards the large arm 131, so as to limit the deformation stroke of the small arm 132.

[0025] Specifically, each elastic clamping arm includes a large arm 131, a small arm 132, and an opening groove 133 formed between the large arm 131 and the small arm 132, allowing the small arm 132 to elastically deform when clamping the enameled wire 210. Simultaneously, a limiting protrusion 134 extending towards the large arm 131 is provided on the upper outer side of the small arm 132. When the small arm 132 deforms towards the large arm 131 under the pressure of the enameled wire 210, the limiting protrusion 134 can engage with the inner side of the large arm 131, thereby limiting the deformation stroke of the small arm 132. This design prevents the small arm 132 from excessively deforming due to excessive force, ensures the clamping depth of the small arm 132 on the enameled wire 210, and mitigates the decrease in elasticity caused by plastic deformation of the small arm 132, thereby improving the clamping stability of the enameled wire 210 and the reliability of the electrical connection.

[0026] Understandably, the two elastic clamping arms are positioned opposite each other, allowing the enameled wire 210 to enter between them. The opening groove 133 formed between the large arm 131 and the small arm 132 can serve as a deformation gap for the small arm 132, enabling it to elastically displace in a cantilevered state. After clamping the enameled wire 210, the small arm 132 undergoes elastic deformation, ensuring pressure on the contact area of ​​the enameled wire 210 and maintaining stable contact resistance. Since the small arm 132 only undergoes elastic deformation, it avoids direct transmission of internal force changes from other materials to the small arm 132. When the enameled wire connection terminal is inserted into the terminal slot, the enameled wire 210 applies a reverse compressive force to the small arm 132, causing it to deform towards the large arm 131. When the deformation reaches a preset level, the limiting protrusion 134 engages with the inner side of the large arm 131 to prevent the small arm 132 from further extending outward.

[0027] In one possible implementation, the limiting protrusion 134 is partially stamped by the forearm 132, that is, the limiting protrusion 134 is partially stamped, and the thickness of the limiting protrusion 134 is less than the thickness of the unstamped area of ​​the forearm 132. Since the fitting gap between the limiting protrusion 134 and the upper arm 131 is small, if this gap is formed directly by blanking, it is easy to damage the tool and reduce the mold life. In this implementation, a larger blanking gap can be formed at the edge of the limiting protrusion 134 first, and then the gap can be reduced by flattening. By adjusting the flattening amount, the contact gap between the limiting protrusion 134 and the inner side of the upper arm 131 can be controlled, thereby controlling the flattening amount of the enameled wire 210, ensuring that the forearm 132 does not undergo plastic deformation, while improving tool life, reducing mold opening costs, and improving product error tolerance.

[0028] In one possible implementation, a grounding part 110 is connected to the other end of the main body 120. The grounding part 110 is used for electrical connection with an external conductor. The grounding part 110 is located at the end of the main body 120 away from the elastic clamping arm and is used to connect the enameled wire connection terminal to the external conductor. The grounding part 110 can be electrically connected to an external circuit board or wire, thereby forming a conductive path between the clamped enameled wire 210 and the external circuit. The grounding part 110 can be, but is not limited to, a pin or a solder joint.

[0029] In one possible implementation, the main body 120 has locking buckle protrusions 140 on both sides, which are used to engage with the terminal slot accommodating the enameled wire 210. The locking buckle protrusions 140 are formed by protruding outward from both sides of the main body 120, and the locking buckle protrusions 140 protrude outward relative to the upper assembly guide section 151 described below. When the enameled wire connection terminal is inserted into the terminal slot, the locking buckle protrusions 140 can form a locking or interference fit with the slot wall of the terminal slot, thereby improving the holding force of the terminal in the terminal slot, and thus reducing the risk of the enameled wire connection terminal coming out of the terminal slot under vibration, improving the assembly reliability of the enameled wire connection terminal.

[0030] In one possible implementation, the outer side of the upper arm 131 is provided with an assembly guide section. This guide section guides the enameled wire connector when it is inserted into the terminal slot accommodating the enameled wire 210, engaging with the inner wall of the terminal slot. The assembly guide section is located on the outer side of the upper arm 131 and protrudes outward relative to other areas on the outer side of the upper arm 131. When the terminal is inserted into the terminal slot and pierces the enameled wire 210 through the piercing tip 180 on the inner side of the lower arm 132, the assembly guide section simultaneously enters the terminal slot and engages with the inner wall of the terminal slot. This provides stable support to the upper arm 131 during insertion, ensuring the piercing tip 180 is aligned with the enameled wire 210 and improving the consistency of the piercing position. The assembly guide section also reduces the wobbling of the enameled wire connector in the terminal slot, lowering the risk of uneven enamel piercing due to misalignment of the enameled wire connector.

[0031] In one possible implementation, the assembly guide section includes an upper assembly guide section 151 disposed on the upper outer side of the upper part of the main arm 131, or the assembly guide section includes an upper assembly guide section 151 disposed on the upper outer side of the upper part of the main arm 131 and a lower assembly guide section 152 disposed on the lower outer side of the main arm 131. When the assembly guide section includes the upper assembly guide section 151, the upper assembly guide section 151 can be disposed near the bending fulcrum of the main arm 131, making the main arm 131 less prone to bending during puncture and improving puncture reliability. In this implementation, the other positions on the outer side of the main arm 131, except for the upper assembly guide section 151, may not contact the inner wall of the terminal groove, so that the clamping of the enameled wire 210 mainly relies on the independent elastic deformation of the forearm 132, thereby reducing the impact of the terminal groove deformation due to temperature on the clamping point. When the assembly guide section includes both the upper assembly guide section 151 and the lower assembly guide section 152, the main arm 131 can form a more stable guide and support in the terminal groove. The lower assembly guide section 152 contacts both sides of the terminal slot before insertion, ensuring that the enameled wire 210 is pierced in the center, guaranteeing the piercing area and quality on both sides. The upper assembly guide section 151 is close to the piercing position, allowing for secondary correction after piercing to prevent twisting or displacement of the piercing position.

[0032] Furthermore, when the assembly guide section includes an upper assembly guide section 151 and a lower assembly guide section 152, the gap between the upper assembly guide sections 151 of the two elastic clamping arms is the same as the gap between the lower assembly guide sections 152 of the two elastic clamping arms, so that the two sets of guide positions can work together to form a stable fit with the terminal slot. During the terminal insertion process, the large arm 131 can be in a simply supported state or a cantilever state at different stress stages. Specifically, when the deflection of the forearm 132 is large, the lower assembly guide section 152 of the upper arm 131 will bend slightly inward, that is, the bending direction of the upper arm 131 is opposite to the bending direction of the forearm 132. At this time, the final state of the upper arm 131 is a cantilever state. When the deflection of the forearm 132 is small, it is not enough to separate the lower assembly guide section 152 from the inner wall of the terminal slot. The upper arm 131 as a whole can be regarded as a simply supported beam. At this time, the final state of the upper arm 131 is a simply supported state. The elastic damping of the forearm 132 offsets the influence of the change of plastic internal force on it, making the lever arm slightly longer, with better elasticity, reducing plastic deformation, so as to ensure contact pressure resistance.

[0033] In the initial stage of piercing and clamping, the upper arm 131 acts as a stable support beam, providing support for piercing and clamping. When the enameled wire 210 enters the upper end of the lower arm 132 and the fulcrum of the lower arm 132 contacts the upper arm 131, the upper arm 131 and the lower arm 132 provide support together, so that the enameled wire 210 is stably clamped flat, which can resist the interaction force after the enameled wire 210 enters and ensure sufficient contact pressure. After passing through this point, the lower arm 132 rebounds and returns to the cantilever state. At the same time, a large stress is generated on the lower part of the lower arm 132, and the upper arm 131 will warp slightly inward. At this time, the upper arm 131 can be regarded as a cantilever beam. The pressure on the enameled wire 210 at this time comes from the rebound force of the lower arm 132 and the rebound force of the upper arm 131 to resist the warping, ensuring sufficient contact resistance pressure.

[0034] In one possible implementation, the bottom of the main body 120 is provided with a retaining boss 160 extending between the two elastic clamping arms. The retaining boss 160 is used to prevent the plastic-coated material from entering the clamping area. When the entire assembly after inserting the enameled wire connector is subjected to secondary injection molding, the retaining boss 160 can prevent the plastic-coated material from entering the clamping area, avoiding interference with the force balance of the clamping structure after the plastic-coated material intrudes, thereby ensuring the stability of the connection structure. The retaining boss 160 can also serve as an upper support for the enameled wire 210, limiting excessive displacement of the enameled wire 210.

[0035] In one possible implementation, the glue-blocking boss 160 is partially stamped from the main body 120. Since the glue-blocking boss 160 serves as the upper support for the enameled wire 210, the gap between it and the forearm 132 is small. If it were directly formed by blanking, it would easily cause tool wear. In this implementation, a larger blanking gap can be formed first, and then the gap can be reduced by a flattening operation, thereby controlling the distance between the glue-blocking boss 160 and the top of the forearm 132. The lower part of the glue-blocking boss 160 has an arc-shaped cross-section, which can avoid the upper apex of the forearm 132 when it is spread open, preventing interference between the forearm 132 and the bottom surface of the glue-blocking boss 160 when the forearm 132 moves to the sides, thereby improving the smoothness of the clamping process and the structural stability.

[0036] In one possible implementation, the inner surface of the forearm 132, from the side furthest from the main body 120 to the side closest to the main body 120, is provided with a guide section, a piercing tip 180, a flattening section 190, and a clamping section 200 in sequence. The gaps between the guide sections of the two forearms 132, between the flattening sections 190, and between the clamping sections 200 gradually decrease along the entry direction of the enameled wire 210. The inner surface of the forearm 132 forms a continuous action structure. When the enameled wire 210 enters the clamping area, the guide section first guides the enameled wire 210, correcting its entry position. Subsequently, the piercing tip 180 pierces the outer enamel coating of the enameled wire 210, allowing the terminal to contact the internal conductor. As the enameled wire 210 continues to enter, the flattening section 190 gradually compresses the enameled wire 210, gradually increasing the clamping force. Finally, the clamping section 200 continuously clamps the enameled wire 210, ensuring the contact pressure between the conductor and the enameled wire connection terminal.

[0037] The guide section includes a first guide section 171 and a second guide section 172, with the curvature of the first guide section 171 being greater than that of the second guide section 172. Before the enameled wire 210 enters, the opposing first guide sections 171 and second guide sections 172 of the two forearms 132 can cooperate to correct the puncture position, thereby ensuring puncture balance. When the enameled wire 210 enters the clamping section 200 and abuts against the adhesive-blocking boss 160, an inverted triangular structure is formed between the clamping section 200 and the adhesive-blocking boss 160 of the two forearms 132, forming a stable locking structure. This prevents the enameled wire 210 from loosening during vibration and ensures a continuous guiding engagement between the enameled wire 210 and the forearms 132. It should be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity from several other entities and do not necessarily require or imply any such actual relationship or order between these entities.

[0038] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0039] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A type of enameled wire connector terminal, characterized in that, The device includes a main body (120) and two elastic clamping arms. The two elastic clamping arms are spaced apart at one end of the main body (120), forming a clamping area between the two elastic clamping arms for the enameled wire (210) to enter. Each elastic clamping arm includes a large arm (131), a small arm (132), and an opening slot (133) formed between the large arm (131) and the small arm (132). The upper part of the large arm (131) is connected to the main body. The upper arm (131) is connected to the lower inner side of the upper arm (131) and the lower outer side of the lower arm (132). The upper outer side of the lower arm (132) is provided with a limiting protrusion (134) extending towards the upper arm (131). The limiting protrusion (134) is configured to cooperate with the inner side of the upper arm (131) when the lower arm (132) deforms towards the upper arm (131) to limit the deformation stroke of the lower arm (132).

2. The enameled wire connector terminal according to claim 1, characterized in that, The limiting protrusion (134) is formed by partial stamping of the forearm (132), and the thickness of the limiting protrusion (134) is less than the thickness of the unstamped area of ​​the forearm (132).

3. The enameled wire connector terminal according to claim 1, characterized in that, The other end of the main body (120) is connected to an electrical contact part (110), which is used to electrically connect to an external conductor.

4. The enameled wire connector terminal according to claim 1, characterized in that, The main body (120) is provided with locking buckle protrusions (140) on both sides, and the locking buckle protrusions (140) are used to engage with the terminal slots that accommodate the enameled wire (210).

5. The enameled wire connector terminal according to claim 1, characterized in that, The outer side of the upper arm (131) is provided with an assembly guide section, which is used to guide and cooperate with the inner wall of the terminal slot when the enameled wire connection terminal is inserted into the terminal slot that accommodates the enameled wire (210).

6. The enameled wire connector terminal according to claim 5, characterized in that, The assembly guide section includes an upper assembly guide section (151) disposed on the outer side of the upper part of the boom (131), or the assembly guide section includes an upper assembly guide section (151) disposed on the outer side of the upper part of the boom (131) and a lower assembly guide section (152) disposed on the outer side of the lower part of the boom (131).

7. The enameled wire connector terminal according to claim 6, characterized in that, When the assembly guide section includes the upper assembly guide section (151) and the lower assembly guide section (152), the gap between the upper assembly guide sections (151) of the two elastic clamping arms is the same as the gap between the lower assembly guide sections (152) of the two elastic clamping arms.

8. The enameled wire connector terminal according to claim 1, characterized in that, The bottom of the main body (120) is provided with a glue-blocking boss (160) extending between the two elastic clamping arms, the glue-blocking boss (160) being used to prevent the plastic coating from entering the clamping area.

9. The enameled wire connector terminal according to claim 8, characterized in that, The adhesive-blocking boss (160) is partially formed by stamping the main body (120); And / or, the lower part of the adhesive-blocking boss (160) has an arc-shaped cross section.

10. The enameled wire connector according to any one of claims 1 to 9, characterized in that, The inner side of the forearm (132) is provided with a guide section, a piercing tip (180), a flattening section (190) and a clamping section (200) in sequence from the side away from the main body (120) to the side closer to the main body (120). The gap between the guide sections of the two forearms (132), the gap between the flattening sections (190) and the gap between the clamping sections (200) gradually decrease along the entry direction of the enameled wire (210).

Images