A terminal structure for automotive wiring harnesses

Abstract

This utility model relates to the field of automotive parts technology and discloses an automotive wiring harness terminal structure, including a terminal body. One end of the terminal body is provided with a wire pressing cylinder. The outer surface of the wire pressing cylinder near the end is provided with locking claws distributed axially. The outer surface of the wire pressing cylinder has a pre-set external thread. A locking sleeve is sleeved on the outer side of the wire pressing cylinder. The inner wall of the locking sleeve has a pre-set internal thread adapted to the external thread. Several positioning protrusions are evenly distributed axially on the inner wall of the wire pressing cylinder. The other end of the terminal body is provided with a terminal connector. This automotive wiring harness terminal structure, by providing an external thread on the outer surface of the wire pressing cylinder that engages with the internal thread of the locking sleeve, and the locking claw structure at the end of the wire pressing cylinder, allows the locking claws to tighten in the axial direction when the locking sleeve is tightened. Combined with the positioning protrusions on the inner wall of the wire pressing cylinder, it can firmly fix the wire, effectively preventing the wire from loosening and improving the firmness and stability of the wire connection.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to an automotive wiring harness terminal structure. Background Technology

[0002] Automotive wiring harnesses are the main network of automotive circuits. Without wiring harnesses, there would be no automotive circuits. Wiring harness terminals are the key components in wiring harnesses that realize electrical connections, and the reliability of their connections directly affects the normal operation of automotive circuits.

[0003] The existing patent document CN215451871U discloses a dustproof automotive wiring harness terminal structure. In this invention, one end of the wiring harness is connected to the device body via a terminal connector, a locking block, and a sliding groove. The locking block and the device body are in a snap-fit ​​connection. When the terminal connector needs to be disassembled, pressing a button squeezes the locking block, disengaging it from the device body, allowing for disassembly. After pressing, the button resets under the action of a second spring. When connecting the other end of the wiring harness, unscrewing the fixing bolt releases the baffle. The baffle rises under the action of a sliding rod. Pulling the slider raises the pressure plate, allowing the wiring harness to pass through the semi-circular groove below the baffle and pressure plate. The wiring harness is then secured with a wiring bolt. After securing, the slider and pressure plate compress the wiring harness under the action of the first spring, and a rubber pad reduces damage to the wiring harness. The baffle resets under the action of the sliding rod and secures the wiring harness, achieving the purpose of preventing the wiring harness from detaching. The baffle also provides dustproof protection for the device body.

[0004] However, the existing automotive wiring harness terminal structure is not conducive to ensuring the stability of wiring harness connection. The existing terminal structure uses the rebound energy of springs to compress and reinforce the wiring harness. However, there are factors such as continuous vibration and temperature fluctuation in the automotive operating environment. Under long-term alternating stress, the spring is prone to elastic fatigue. As the usage time increases, the spring rebound force will gradually decrease, and the originally tight compression will gradually loosen. It is difficult to continuously form a stable and uniform pressure on the wiring harness, resulting in a decrease in the contact tightness between the wiring harness and the terminal. This can lead to problems such as poor contact and unstable conduction, which seriously affects the long-term stability of wiring harness connection. Utility Model Content

[0005] The purpose of this utility model is to provide an automotive wiring harness terminal structure that solves the problem mentioned in the background art that the existing automotive wiring harness terminal structures are not conducive to ensuring the stability of wiring harness insertion.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an automotive wiring harness terminal structure, comprising a terminal body, a wire pressing cylinder at one end of the terminal body, a locking claw distributed axially on the outer surface of the wire pressing cylinder near the end, an external thread on the outer surface of the wire pressing cylinder, a locking sleeve sleeved on the outer side of the wire pressing cylinder, and an internal thread adapted to the external thread on the inner wall of the locking sleeve.

[0007] The inner wall of the wire pressing cylinder has several positioning protrusions evenly distributed along the axial direction, and the other end of the terminal body is provided with a terminal connector.

[0008] The terminal connector is provided with three elastic contact pieces at its end.

[0009] The elastic contact pieces are evenly distributed along the circumference of the terminal joint, and are arc-shaped and protrude in a direction away from the axis of the terminal joint.

[0010] The terminal connector has two guide strips symmetrically arranged on its outer surface, and a connector socket is inserted into the end of the terminal connector away from the terminal body.

[0011] The connector socket has a slot in the middle, and guide grooves are symmetrically arranged on both sides of the slot, with the guide grooves corresponding to the guide strips.

[0012] 1. The present invention relates to an automotive wiring harness terminal structure, which, by setting an external thread on the outer surface of the wire pressing cylinder to engage with the internal thread of the locking sleeve, and a locking claw structure at the end of the wire pressing cylinder, allows the locking claw to tighten in the axial direction when the locking sleeve is tightened. In conjunction with the positioning protrusion on the inner wall of the wire pressing cylinder, the wire can be firmly fixed, effectively preventing the wire from loosening and improving the firmness and stability of the wire connection.

[0013] 2. The present invention provides an automotive wiring harness terminal structure, which provides three circumferentially evenly distributed arc-shaped elastic contact pieces at the end of the terminal connector, with the contact pieces protruding away from the axis. When plugged into the connector socket, the elastic contact pieces can make tight contact with the inside of the socket, ensuring the reliability of the conductivity. At the same time, the elastic design can reduce contact wear and extend the service life.

[0014] 3. The automotive wiring harness terminal structure of this utility model provides symmetrical guide strips on the outer surface of the terminal connector and corresponding guide grooves on both sides of the connector socket slot, which play a precise guiding role during insertion and removal, making the connection between the terminal connector and the connector socket smoother, reducing insertion and removal resistance, improving the ease of operation, and avoiding component damage caused by connection deviation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a three-dimensional structural diagram of the terminal body and locking sleeve of this utility model;

[0018] Figure 3 This is a three-dimensional structural diagram of the terminal connector and connector socket of this utility model;

[0019] Figure 4 This is an enlarged structural diagram showing a partial detail of the wire pressing cylinder of this utility model.

[0020] In the diagram: 1. Terminal body; 2. Crimping cylinder; 3. Locking claw; 4. External thread; 5. Locking sleeve; 6. Internal thread; 7. Positioning protrusion; 8. Terminal connector; 9. Elastic contact piece; 10. Guide strip; 11. Connector socket; 12. Slot; 13. Guide groove. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0022] Please see Figures 1-4 This utility model provides a technical solution: an automotive wiring harness terminal structure, including a terminal body 1, a wire pressing cylinder 2 at one end of the terminal body 1, a locking claw 3 distributed axially on the outer surface of the wire pressing cylinder 2 near the end, an external thread 4 pre-set on the outer surface of the wire pressing cylinder 2, a locking sleeve 5 sleeved on the outer side of the wire pressing cylinder 2, and an internal thread 6 pre-set on the inner wall of the locking sleeve 5 that matches the external thread 4.

[0023] During the wiring harness connection stage, the operator inserts the pre-treated wiring harness wire end into the crimping cylinder 2. After the wiring harness wire is pre-inserted, the operator tightens the locking sleeve 5 fitted on the outside of the crimping cylinder 2. Because the internal thread 6 on the inner wall of the locking sleeve 5 forms a precise fit with the external thread 4 on the outer surface of the crimping cylinder 2, under the action of rotational force, the locking sleeve 5 will move steadily along the axial direction of the crimping cylinder 2 towards the locking claw 3. As the locking sleeve 5 continues to advance, its inner end wall will lock with the outer surface of the crimping cylinder 2. The claw 3 generates progressive compression, and the weak section where the root of the locking claw 3 is connected to the body of the wire pressing cylinder 2 undergoes elastic deformation, forcing the claws distributed along the axis to retract towards the axis of the wire pressing cylinder 2. This retraction action will form a ring-shaped clamping force, tightly wrapping the automotive wiring harness wires and continuously applying pressure, forming an internal and external clamping fixing effect with the positioning protrusion 7 on the inner wall. The dual force greatly improves the overall firmness of the connection between the automotive wiring harness wires and the wire pressing cylinder 2, and can effectively prevent the automotive wiring harness wires from loosening or making poor contact even in the long-term vibration environment of the car.

[0024] The inner wall of the wire clamping cylinder 2 has several positioning protrusions 7 evenly distributed along the axial direction. The other end of the terminal body 1 is provided with a terminal connector 8. The end of the terminal connector 8 is provided with an elastic contact piece 9. There are three elastic contact pieces 9, which are evenly distributed along the circumference of the terminal connector 8 and are arc-shaped and protrude in a direction away from the axis of the terminal connector 8. Two guide strips 10 are symmetrically arranged on the outer surface of the terminal connector 8. A connector socket 11 is inserted into the end of the terminal connector 8 away from the terminal body 1. A slot 12 is opened in the middle of the connector socket 11. Guide grooves 13 are symmetrically arranged on both sides of the slot 12. The guide grooves 13 correspond to the guide strips 10.

[0025] The locating protrusions 7 evenly distributed axially on the inner wall of the crimping cylinder 2 immediately form multi-point interlocking contact with the surface of the automotive wiring harness wires. These serrated locating protrusions 7 can embed into the insulation or conductor gaps of the outer layer of the automotive wiring harness wires, which not only increases the friction between the automotive wiring harness wires and the crimping cylinder 2, but also achieves preliminary mechanical limiting through physical interlocking, playing a reliable pre-fixing role and preventing axial movement of the automotive wiring harness wires during subsequent locking operations. During the terminal docking stage of the automotive wiring harness, the terminal connector 8 at the other end of the terminal body 1 needs to be inserted with the corresponding connector socket 11. Before insertion, the two guide strips 10 symmetrically arranged on the outer surface of the terminal connector 8 will form precise alignment with the guide grooves 13 on both sides of the slot 12 of the connector socket 11. When the operator pushes the terminal connector 8, the guide strips 10 will slide smoothly along the trajectory of the guide grooves 13, which not only eliminates the problem of the automotive wiring harness end... The directional deviation during the insertion process is also limited by the sliding groove to restrict the radial swing of the terminal connector 8, ensuring the accuracy of the automotive wiring harness terminal docking action. When the terminal connector 8 is fully inserted into the slot 12, the three elastic contact pieces 9 at its end will form a tight connection with the conductive contacts inside the connector socket 11. Since the elastic contact pieces 9 are arc-shaped and naturally bulge away from the axis of the terminal connector 8, they will be squeezed by the inner wall of the socket during the insertion process and generate elastic deformation. This deformation will be converted into a continuous rebound force, so that the contact pieces and conductive contacts maintain a constant pressure. The three elastic contact pieces 9 evenly distributed in the circumference form a triangular contact layout, which not only ensures the multi-path redundancy of the current conduction of the automotive wiring harness, but also balances the radial stress after insertion through symmetrical force, effectively avoiding the contact failure problem that may occur in single-point contact, and finally achieving a stable and reliable electrical connection of the automotive wiring harness.

[0026] Working principle: During the wiring harness connection stage, the operator inserts the pre-treated wiring harness wire end into the crimping cylinder 2. At this time, the positioning protrusions 7 evenly distributed axially on the inner wall of the crimping cylinder 2 immediately form multi-point interlocking contact with the surface of the wiring harness wire. These serrated positioning protrusions 7 can embed into the insulation or conductor gaps of the outer layer of the wiring harness wire, which not only increases the friction between the wiring harness wire and the crimping cylinder 2, but also achieves preliminary mechanical limiting through physical interlocking, playing a reliable pre-fixing role and preventing axial movement of the wiring harness wire during subsequent locking operations. After the wiring harness wire is pre-inserted, the operator tightens the locking sleeve 5 fitted on the outside of the crimping cylinder 2. The internal thread 6 on the inner wall of the cylinder 5 forms a precise fit with the external thread 4 on the outer surface of the pressure cylinder 2. Under the action of rotational force, the locking sleeve 5 will move steadily towards the locking claw 3 along the axial direction of the pressure cylinder 2. As the locking sleeve 5 continues to advance, its end inner wall will gradually squeeze the locking claw 3 on the outer surface of the pressure cylinder 2. The weak section at the root of the locking claw 3 connected to the body of the pressure cylinder 2 undergoes elastic deformation, forcing the claws distributed along the axial direction to retract towards the axis of the pressure cylinder 2. This retraction action will form a ring-shaped clamping force, tightly wrapping the automotive wiring harness wires and continuously applying pressure, forming an internal and external clamping fixing effect with the positioning protrusion 7 on the inner wall. The dual force greatly improves the connection between the automotive wiring harness wires and the pressure cylinder 2. The overall robustness ensures that even in the vibrating environment of a car's long-term bumpy ride, it effectively prevents the automotive wiring harness wires from loosening or making poor contact. During the terminal connection stage of the automotive wiring harness, the terminal connector 8 at the other end of the terminal body 1 must be inserted into the corresponding connector socket 11. Before insertion, two guide strips 10 symmetrically arranged on the outer surface of the terminal connector 8 will precisely align with the guide grooves 13 on both sides of the slot 12 of the connector socket 11. When the operator pushes the terminal connector 8, the guide strips 10 will slide smoothly along the trajectory of the guide grooves 13, not only eliminating directional deviation during the automotive wiring harness terminal insertion process but also limiting the radial swing of the terminal connector 8 through the sliding groove cooperation, ensuring the accuracy of the automotive wiring harness terminal connection action. After connector 8 is fully inserted into slot 12, the three elastic contact pieces 9 at its end will form a tight connection with the conductive contacts inside connector socket 11. Since the elastic contact pieces 9 are arc-shaped and naturally bulge away from the axis of terminal connector 8, they will be squeezed by the inner wall of the socket during insertion and produce elastic deformation. This deformation will be converted into a continuous rebound force, so that the contact pieces and conductive contacts maintain a constant pressure. The three elastic contact pieces 9, which are evenly distributed around the circumference, form a triangular contact layout, which not only ensures the multi-path redundancy of current conduction in automotive wiring harnesses, but also balances the radial stress after insertion through symmetrical force, effectively avoiding the contact failure problem that may occur with single-point contact, and finally achieving a stable and reliable electrical connection of automotive wiring harnesses.

[0027] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. An automotive wiring harness terminal structure, comprising a terminal body (1), characterized in that: One end of the terminal body (1) is provided with a wire pressing cylinder (2). The outer surface of the wire pressing cylinder (2) near the end is provided with locking claws (3) distributed along the axial direction. The outer surface of the wire pressing cylinder (2) is provided with an external thread (4). The outer side of the wire pressing cylinder (2) is fitted with a locking sleeve (5). The inner wall of the locking sleeve (5) is provided with an internal thread (6) that matches the external thread (4).

2. The automotive wiring harness terminal structure according to claim 1, characterized in that: The inner wall of the wire pressing cylinder (2) is evenly distributed with several positioning protrusions (7) along the axial direction, and the other end of the terminal body (1) is provided with a terminal connector (8).

3. The automotive wiring harness terminal structure according to claim 2, characterized in that: The terminal connector (8) is provided with an elastic contact piece (9) at its end, and the number of elastic contact pieces (9) is three.

4. The automotive wiring harness terminal structure according to claim 3, characterized in that: The elastic contact piece (9) is evenly distributed along the circumference of the terminal joint (8) and is arc-shaped and protrudes in a direction away from the axis of the terminal joint (8).

5. The automotive wiring harness terminal structure according to claim 2, characterized in that: Two guide strips (10) are symmetrically arranged on the outer surface of the terminal connector (8), and a connector socket (11) is inserted into the end of the terminal connector (8) away from the terminal body (1).

6. The automotive wiring harness terminal structure according to claim 5, characterized in that: The connector socket (11) has a slot (12) in the middle, and guide grooves (13) are symmetrically arranged on both sides of the slot (12), and the guide grooves (13) correspond to the guide strip (10).

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