Wire harness shielding shell and wire harness connector

Abstract

The utility model relates to the technical field of Ethernet high-frequency signal transmission, in particular to a wire harness shielding shell and a wire harness connector, and solves the problem that impedance matching cannot be realized in the prior art. The wire harness shielding shell comprises a front-section shielding shell and a rear-section shielding shell, the front-section shielding shell is connected with the rear-section shielding shell in a clamped mode, the rear-section shielding shell is provided with an impedance matching section used for improving impedance matching, and the impedance matching section is of a double-cylinder structure. The beneficial effects of the utility model are that when the connector is assembled, the inner lead of the line assembly passes through the double-cylinder structure, the coupling distance between the inner lead and the inner wall of the shielding shell is changed by using the double-cylinder structure, and the impedance is adjusted by using the principle that the coupling distance affects the impedance, so that the purpose of improving the impedance matching is achieved; and the signal integrity of a transmission link is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of Ethernet high-frequency signal transmission, in particular to a wire harness shielding shell and a wire harness connector. Background Technique

[0002] Automobile connectors are key components for undertaking in-vehicle signal transmission and are widely used in in-vehicle imaging systems, detection systems, and assisted driving systems. With the rapid development of the electrification, intelligence, networking, and sharing of automobiles, in-vehicle communication is becoming increasingly frequent. How to improve the signal integrity of wire harnesses, enable signal transmission without distortion, and ensure driving safety has become a challenge and development direction for in-vehicle Ethernet and other types of electrical connectors.

[0003] At present, in-vehicle Ethernet wire harness connectors are divided into wire harness plug-type connectors and wire harness socket-type connectors. During signal transmission, since the wire harness connector and its signal link are not linear and uniform structures, when the signal passes through the non-uniform structure, impedance matching imbalance will occur, resulting in signal energy reflection. In the past, for low-speed in-vehicle signal transmission below 1Gbit / s, various wire harness connectors could still meet the transmission requirements of low-speed signals under a small impedance imbalance. However, as the in-vehicle signal transmission rate increases to the 10Gbit / s level and the base frequency increases above 4GHz, most wire harness connectors basically cannot meet the high-speed and high-frequency signal transmission requirements.

[0004] The patent with the patent number CN117154455A discloses a connector device and its assembly method. The connector device includes a high-frequency connector and a single-pair differential high-frequency cable connected to the rear end of the high-frequency connector. The high-frequency connector includes 4 functional areas axially. The 4 functional areas are respectively a mating contact section for electrically interconnecting with a mating connector, a welding and fixing section for fixing a metal shielding front shell and a metal shielding rear shell by welding, an impedance matching section for changing the shape structure to improve the differential characteristic impedance change caused by wire stripping, and a cable fixing section for changing the shape structure to achieve a reliable mechanical connection between the connector and the cable. Since the cable assembly needs to be connected to the terminal in the above-mentioned connector, a sheath stripping section is provided, which leads to a sudden change in impedance in the sheath stripping section, and further causes the connector to be unable to achieve the purpose of impedance matching, unable to improve the signal integrity of the transmission link, and unable to meet the high-speed and high-frequency transmission requirements. Content of the Utility Model

[0005] The utility model provides a wire harness shielding shell and a wire harness connector, which solve the problem of inability to achieve impedance matching in the prior art.

[0006] The technical solution of the utility model is realized as follows:

[0007] A wire harness shielding case includes a front-section shielding case and a rear-section shielding case. The front-section shielding case is snap-connected to the rear-section shielding case. An impedance matching section for improving impedance matching is provided on the rear-section shielding case, and the impedance matching section is of a double-barrel structure. The double-barrel structure changes the coupling distance between the inner conductor of the cable and the inner wall of the rear-section shielding case. Using the principle that the coupling distance affects impedance, impedance adjustment is carried out to achieve the purpose of improving impedance matching and enhancing the signal integrity of the transmission link.

[0008] An insulating connection section for connecting an insulating medium is provided at the front end of the impedance matching section, and the front-section shielding case is sleeved on the insulating connection section. A cable connection section for connecting a cable assembly is provided at the tail end of the impedance matching section. The insulating connection section and the cable connection section are integrally connected to the impedance matching section, and the rear-section shielding case is made by stamping and bending.

[0009] The double-barrel structure is an 8-shaped structure or a B-shaped structure. The cross-section of a single barrel of the double-barrel structure is circular or horseshoe-shaped, and the circular or horseshoe shape can change the coupling distance between the inner conductor of the cable and the inner wall of the shielding case.

[0010] The two barrels of the double-barrel structure are interconnected or closed. These two barrel connection methods ensure the diversity of the double-barrel structure and enhance the applicability of the double-barrel structure.

[0011] A wire harness connector includes a sheath. A wire harness shielding case is provided inside the sheath. A limiting spring arm is provided on the sheath, and the wire harness shielding case is snap-connected to the limiting spring arm. The sheath limits the wire harness shielding case through the limiting spring arm to ensure the stable installation of the wire harness shielding case inside the sheath.

[0012] A cable assembly is connected inside the cable connection section at the tail end of the wire harness shielding case. A sheath stripping section is provided at the front end of the cable assembly, and the sheath stripping section is inserted into the impedance matching section. The cable assembly is provided with a first inner conductor and a second inner conductor, and the first inner conductor and the second inner conductor are respectively located in the two barrels, changing the coupling distance between the inner conductor and the inner wall of the shielding case.

[0013] The length of the sheath stripping section is greater than the length of the impedance matching section. This ensures that the inner conductor of the cable assembly can penetrate deep into the insulating medium and ensures the smooth connection between the inner conductor and the inner signal terminal.

[0014] A heat-shrinkable rubber sleeve is provided on the cable connection section, and the heat-shrinkable rubber sleeve is connected to the cable assembly. The heat-shrinkable rubber sleeve connects the rear-section shielding case and the cable assembly together, ensuring the stable relative position between the cable assembly and the rear-section shielding case, and further ensuring the stable structure of the connector.

[0015] An insulating medium is provided in the insulating connection section at the front end of the harness shielding shell, and an inner signal terminal is inserted into the insulating medium. The end of the cable assembly is connected to the inner signal terminal. The inner signal terminal is located at the center of the insulating medium, and the insulating medium separates the inner signal terminal from the shielding shell; the insulating medium is squeezed and matched with the rear shielding shell to ensure that the insulating medium is stably installed in the rear shielding shell.

[0016] The beneficial effect of the utility model is that when the connector is assembled, the inner wire of the line component is passed through the double-tube structure, the double-tube structure is used to change the coupling distance between the inner wire and the inner wall of the shielding shell, and the impedance is adjusted by using the principle that the coupling distance affects the impedance, so as to achieve the purpose of improving the impedance matching and improve the signal integrity of the transmission link.

[0017] In the field of vehicle-mounted Ethernet, the signal integrity directly determines the quality rate of information transmission. The method of using a double-tube structure to change the coupling distance between the inner wire and the inner wall of the shielding shell is highly applicable and has obvious effects in optimizing the signal integrity of Ethernet devices. It also has strong portability and can be used in the development and design of various types of vehicle-mounted high-speed connectors, thereby improving the product development speed and work efficiency, and reducing the product development time and development cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is an exploded view of the wiring harness connector of the utility model;

[0020] Figure 2 It is a longitudinal cross-sectional view of the wiring harness connector;

[0021] Figure 3 A transverse cross-sectional view of a harness connector according to an embodiment;

[0022] Figure 4 This is a schematic diagram of the rear shielding shell structure of the first embodiment;

[0023] Figure 5 This is a schematic diagram of the non-closed state of the rear shielding shell of the first embodiment;

[0024] Figure 6 This is a schematic diagram of the closed state of the rear shielding shell of the first embodiment;

[0025] Figure 7 It is a transverse cross-sectional view of the wiring harness connector of the second embodiment;

[0026] Figure 8 Schematic diagram of the shielding case structure for Embodiment 2;

[0027] Figure 9 Schematic diagram of the non-closed form of the rear-section shielding case for Embodiment 2;

[0028] Figure 10 Schematic diagram of the closed form of the rear-section shielding case for Embodiment 2;

[0029] Figure 11 Schematic diagram of the impedance curve of the connector when the shielding case of Embodiment 1 is in the non-closed form;

[0030] Figure 12 Schematic diagram of the impedance curve of the connector when the shielding case of Embodiment 1 is in the closed form;

[0031] Figure 13 Schematic diagram of the impedance curve of the connector when the shielding case of Embodiment 2 is in the non-closed form;

[0032] Figure 14 Schematic diagram of the impedance curve of the connector when the shielding case of Embodiment 2 is in the closed form.

[0033] In the figure: 1. Sheath, 2. Front-section shielding case, 3. Insulating medium, 4. Rear-section shielding case, 5. Inner signal terminal, 6. Heat-shrinkable sleeve, 7. Cable assembly, 71. First inner wire, 72. Second inner wire, 41. Cable connection section, 42. Impedance matching section, 43. Insulating connection section. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Embodiment 1, as shown in Figure 3 、 Figure 4 A wire harness shielding case includes a front-section shielding case 2 and a rear-section shielding case 4. The front-section shielding case 2 is snap-connected to the rear-section shielding case 4. The rear-section shielding case 4 is provided with an impedance matching section 42 for improving impedance matching. The impedance matching section 42 is a double-barrel structure. The double-barrel structure changes the coupling distance between the inner wire of the cable and the inner wall of the rear-section shielding case 4. By using the principle that the coupling distance affects impedance, impedance adjustment is carried out to achieve the purpose of improving impedance matching and enhancing the signal integrity of the transmission link.

[0036] Further, an insulating connection section 43 for connecting the insulating medium 3 is provided at the front end of the impedance matching section 42, and the front section shielding case 2 is sleeved on the insulating connection section 43. A cable connection section 41 for connecting the cable assembly 7 is provided at the tail end of the impedance matching section 42. The insulating connection section 43 and the cable connection section 41 are integrally connected to the impedance matching section 42, and the rear section shielding case 4 is formed by stamping and bending.

[0037] Further, as Figure 5 , Figure 6 shown, the double-barrel structure is an 8-shaped structure, and the two barrels of the double-barrel structure communicate with each other or are closed. Both barrels in the 8-shaped structure are circular structures, and the circular structure effectively changes the coupling distance between the conductors in the cable and the inner wall of the double-barrel structure, realizing the adjustment of impedance matching.

[0038] Specifically, as Figure 11 shown, when the impedance matching section 42 of the rear section shielding case 4 adopts an 8-shaped non-closed double-barrel structure, the impedance curve fluctuates less, that is, the impedance reaches an equilibrium state, achieving the purpose of improving impedance matching. The impedance curve corresponding to the A area shown in the figure is the impedance at the position of the impedance matching section 42 inside the connector.

[0039] Specifically, as Figure 12 shown, when the impedance matching section 42 of the rear section shielding case 4 adopts an 8-shaped closed double-barrel structure, the impedance curve fluctuates less, that is, the impedance reaches an equilibrium state, achieving the purpose of improving impedance matching. Among them, the impedance curve of the non-closed double-barrel structure fluctuates less than that of the closed double-barrel structure, that is, the non-closed double-barrel structure has a better effect on improving impedance matching.

[0040] Example 2 is different from Example 1 in that a wire harness shielding case, as Figure 7 , Figure 8 , Figure 9 , Figure 10 shown, the double-barrel structure is a B-shaped structure, and the two barrels of the double-barrel structure communicate with each other or are closed. Both barrels of the B-shaped structure are horseshoe-shaped structures, and the horseshoe-shaped structure effectively changes the coupling distance between the conductors in the cable and the inner wall of the double-barrel structure, realizing the adjustment of impedance matching.

[0041] Specifically, as Figure 13 shown, when the impedance matching section 42 of the rear section shielding case 4 adopts a B-shaped non-closed double-barrel structure, the impedance curve fluctuates less, that is, the impedance reaches an equilibrium state, achieving the purpose of improving impedance matching.

[0042] Specifically, as Figure 14As shown in the figure, when the impedance matching section 42 of the rear shielding case 4 adopts a B-shaped closed double-barrel structure, the impedance curve fluctuates less, that is, the impedance reaches an equilibrium state, achieving the purpose of improving the impedance matching. Among them, the non-closed double-barrel structure has a smaller impedance curve fluctuation than the closed double-barrel structure, that is, the non-closed double-barrel structure has a better effect on improving the impedance matching.

[0043] Example 3, based on Example 1, as Figure 1 、 Figure 2 shown, a wire harness connector includes a sheath 1. A wire harness shielding case is provided inside the sheath 1. At least one limiting elastic arm is provided on the sheath 1. The wire harness shielding case is clamped with the limiting elastic arm. In this embodiment, the number of the limiting elastic arms is two, and the two limiting elastic arms are symmetrically arranged on both sides of the sheath 1. Specifically, the limiting elastic arm is clamped and matched with the tail end of the front shielding case 2, and the connection position between the impedance matching section 42 and the insulating connection section 43 is clamped and matched with the limiting elastic arm. The limiting elastic arm limits the positions of the front shielding case 2 and the rear shielding case 4 in the sheath 1, ensuring the stable installation of the wire harness shielding case in the sheath 1.

[0044] Furthermore, a cable assembly 7 is connected inside the cable connection section 41 at the tail end of the wire harness shielding case. A sheath stripping section is provided at the front end of the cable assembly 7, and the sheath stripping section is inserted into the impedance matching section 42. The cable assembly 7 includes a first inner wire 71 and a second inner wire 72. The first inner wire 71 and the second inner wire 72 are respectively inserted into the two barrels of the double-barrel structure, effectively controlling the coupling distance between the inner wire and the inner wall of the shielding case.

[0045] Furthermore, the length of the sheath stripping section is greater than the length of the impedance matching section 42. As Figure 2 shown, in this embodiment, the sheath stripping section is section M, and the impedance matching section 42 of the rear shielding case 4 is section L. The length of section M is greater than the length of section L, ensuring that the inner wires of the cable assembly 7 can penetrate into the insulating medium 3 and ensuring the smooth connection between the inner wires and the inner signal terminals 5.

[0046] Furthermore, a heat-shrinkable rubber sleeve 6 is provided on the cable connection section 41, and the heat-shrinkable rubber sleeve 6 is connected to the cable assembly 7. After the cable assembly 7 is connected to the wire harness shielding case, the heat-shrinkable rubber sleeve 6 is sleeved on the wire harness shielding case so that the heat-shrinkable rubber sleeve 6 is located at the connection position between the wire harness shielding case and the cable assembly 7. Then, the heat-shrinkable rubber sleeve 6 is shrunk by heating the heat-shrinkable rubber sleeve 6, so that the heat-shrinkable rubber sleeve 6 hoops the wire harness shielding case and the cable assembly 7, realizing the fixation of the relative positions of the cable assembly 7 and the wire harness shielding case and ensuring the stability of the cable assembly 7.

[0047] Further, an insulating medium 3 is provided inside the insulating connection section 43 at the front end of the wire harness shielding case. An inner signal terminal 5 is inserted through the insulating medium 3. The end of the cable assembly 7 is connected to the inner signal terminal 5. The inner signal terminal 5 is located at the center of the insulating medium 3, and the insulating medium 3 isolates the inner signal terminal 5 from the shielding case. The insulating medium 3 is in press fit with the rear section shielding case 4 to ensure stable installation of the insulating medium 3 inside the rear section shielding case 4.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wire harness shielding case, characterized in that, It includes a front-stage shielding shell (2) and a rear-stage shielding shell (4). The front-stage shielding shell (2) is snap-connected to the rear-stage shielding shell (4). An impedance matching section (42) for improving impedance matching is provided on the rear-stage shielding shell (4), and the impedance matching section (42) is of a double-barrel structure.

2. The wire harness shielding case according to claim 1, characterized in that, An insulating connection section (43) for connecting an insulating medium (3) is provided at the front end of the impedance matching section (42), and the front-stage shielding shell (2) is sleeved on the insulating connection section (43).

3. The wire harness shielding case according to claim 1 or 2, characterized in that, A cable connection section (41) for connecting a cable assembly (7) is provided at the tail end of the impedance matching section (42).

4. The wire harness shielding case according to claim 3, characterized in that, The double-barrel structure is an 8-shaped structure or a B-shaped structure.

5. The wire harness shielding case according to claim 1 or 4, characterized in that, The two barrels of the double-barrel structure communicate with each other or are closed.

6. A wire harness connector, characterized in that, It includes a sheath (1). A wire harness shielding shell as described in any one of Items 1 to 5 is provided inside the sheath (1). At least one limiting elastic arm is provided on the sheath (1), and the wire harness shielding shell is snap-connected to the limiting elastic arm.

7. The wire harness connector according to claim 6, characterized in that, A cable assembly (7) is connected inside the cable connection section (41) at the tail end of the wire harness shielding shell. A sheath stripping section is provided at the front end of the cable assembly (7), and the sheath stripping section is inserted into the impedance matching section (42).

8. The wire harness connector according to claim 7, wherein, The length of the sheath stripping section is greater than the length of the impedance matching section (42).

9. The wire harness connector according to claim 7 or 8, characterized in that A heat-shrinkable rubber sleeve (6) is provided on the cable connection section (41), and the heat-shrinkable rubber sleeve (6) is connected to the cable assembly (7).

10. The wire harness connector according to claim 9, characterized in that, An insulating medium (3) is provided inside the insulating connection section (43) at the front end of the wire harness shielding shell. An inner signal terminal (5) is inserted into the insulating medium (3), and the end of the cable assembly (7) is connected to the inner signal terminal (5).

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