Plug connector and connector combination

Abstract

The utility model discloses a plug connector and a connector combination, and the plug connector comprises an insulating housing which is provided with a first installation cavity and a second installation cavity which are communicated with each other, one end of the first installation cavity is provided with a first installation port, and one end of the second installation cavity is provided with a second installation port; the terminal assembly is assembled into the first mounting cavity from the first mounting port; the cable assembly is assembled into the second mounting cavity from the second mounting port, and the end part of the cable assembly extends into the first mounting cavity and is electrically connected with the terminal of the terminal assembly; the rotation stopping piece is inserted and installed into the first installation cavity through the first installation opening and comprises a rotation stopping part and a fastening part which are fixedly connected, the fastening part is implanted into the second installation cavity and is fastened to the periphery of the cable assembly in a sleeving mode, and the rotation stopping part is assembled in the first installation cavity; a stop part is formed on the inner wall surface of the first mounting cavity, and the rotation stopping piece correspondingly abuts against the stop part and is configured to be incapable of rotating relative to the insulating shell.

Description

TECHNICAL FIELD

[0001] The application relates to a plug connector and a connector combination. BACKGROUND

[0002] With the development of new energy automobile technology, the reliability, protection level, vehicle assembly efficiency, wire harness production efficiency of high-voltage connectors are increasingly required, and the appearance is also increasingly required.

[0003] The cable connector generally comprises a shell, an inner shell fixed in the shell, a plurality of terminal pieces fixed in the inner shell, and a cable piece implanted in the shell at one end, and the end of the cable piece is electrically connected with the plurality of terminal pieces. However, such connectors have a common problem that after the cable piece is assembled into the shell and electrically connected with the terminal pieces, the cable piece often rotates relative to the shell due to angle adjustment and operator operation during use and mating with the mating connector, which causes poor stability of the cable piece and the terminal pieces.

[0004] Therefore, it is necessary to design a new scheme to solve the above technical problems. CONTENT OF THE INVENTION

[0005] The application aims to provide a plug connector and a connector combination, which can prevent the terminal assembly from rotating relative to the insulating shell.

[0006] To achieve the above purpose, the application provides the following technical scheme:

[0007] A plug connector comprises:

[0008] An insulating shell is formed with a first installation cavity and a second installation cavity in communication with each other, one end of the first installation cavity forms a first installation port, and one end of the second installation cavity forms a second installation port;

[0009] A terminal assembly is provided with an insulating inner shell and a plurality of terminals fixedly combined with the insulating inner shell, and the terminal assembly is assembled into the first installation cavity through the first installation port;

[0010] A cable assembly is assembled into the second installation cavity through the second installation port, and the end thereof extends into the first installation cavity and is electrically connected with the plurality of terminals;

[0011] A rotation stopping piece is inserted into the first installation cavity through the first installation port, comprising a rotation stopping part and a fastening part fixedly connected, wherein the fastening part is implanted in the second installation cavity adjacent to the first installation cavity and is tightly fastened on the periphery of the cable assembly, and the rotation stopping part is assembled in the first installation cavity adjacent to the second installation cavity:

[0012] The inner wall surface of the first installation cavity is formed with a stop portion, which corresponds to the stop portion and is configured to be unable to rotate relative to the insulating shell.

[0013] Further, the inner wall surface of the first installation cavity includes a planar bottom wall surface opposite to the first installation opening and a planar side wall surface arranged at an angle with the bottom wall surface;

[0014] The stop portion includes a flat plate-shaped bottom plate portion abutting against the bottom wall surface and a flat plate-shaped side plate portion integrally connected with the bottom plate portion and abutting against the side wall surface.

[0015] Further, the side wall surface is formed with two and intersects with the left and right sides of the bottom wall surface respectively;

[0016] The side plate portion is formed with two and connected with the left and right sides of the bottom plate portion respectively, and the two side plate portions correspond to abut against the two side wall surfaces respectively.

[0017] Further, the side wall surface is perpendicular to the bottom wall surface.

[0018] Further, the inner wall surface of the first installation cavity further includes end wall surfaces intersecting with the front and rear sides of the bottom wall surface respectively, the end wall surfaces are formed with two, each of the end wall surfaces is perpendicular to the bottom wall surface, and each of the end wall surfaces is perpendicular to the side wall surface;

[0019] The second installation cavity is recessed formed in the end wall surface.

[0020] Further, it further includes:

[0021] A buckle wall, one end of which is integrally connected with the outer surfaces of the left and right ends of the insulating inner shell, and the other end is cantilevered and formed with a hook portion;

[0022] A deformation gap is formed between the buckle wall and the outer surfaces of the left and right ends of the corresponding insulating inner shell;

[0023] A matching groove is recessed formed on the side wall surface of the insulating shell and opens to the first installation opening side;

[0024] A buckle portion is formed in the matching groove, when the terminal assembly is assembled into the first installation cavity through the first installation opening, the buckle wall is correspondingly accommodated in the matching groove, and the hook portion is correspondingly locked with the buckle portion and is configured to prevent the terminal assembly from being separated from the insulating shell.

[0025] Further, the buckle portion is a groove recessed further inward from the inner wall surface of the matching groove.

[0026] Further, it further includes:

[0027] A locking arm is formed on the outer side surface of the left and right sides of the insulating housing, and includes a middle section, an operation section further extended from the front end of the middle section in the insertion direction of the mating connector, and a locking section further extended from the rear end of the middle section in the insertion direction of the mating connector;

[0028] A connecting arm integrally connects the middle section with the outer side surface of the left and right sides of the insulating housing on both sides of the middle section;

[0029] A deformation space is formed between the middle section and the outer side surface of the left and right sides of the insulating housing;

[0030] When the operation section is pressed towards the outer side surface of the insulating housing, the locking arm can be deflected away from the outer side surface of the insulating housing.

[0031] To achieve the above object, the present application further provides the following technical solutions:

[0032] A connector assembly includes the plug connector as described above, and further includes:

[0033] A mating connector is formed with a housing member and mating terminals combined in the housing member;

[0034] The housing member includes a base, a ring wall mating portion further extended from one end surface of the base, and a mating locking arm integrally connected with the one end surface of the base;

[0035] The ring wall mating portion and the base jointly define a mating cavity with an opening at one end, and one end of each mating terminal protrudes into the mating cavity in a cantilevered manner;

[0036] One end of the mating locking arm is integrally connected with the base, the other end of the mating locking arm is in a cantilevered manner, the mating locking arm is located outside the ring wall mating portion and is spaced apart from the outer surface of the ring wall mating portion;

[0037] When the mating connector is mated with the plug connector, the locking section of the locking arm can be locked with the mating locking arm, and is configured to prevent the mating connector from being separated from the plug connector.

[0038] Further, the present application further includes:

[0039] A mating ring cavity is recessed on the front end surface of the insulating housing in the mating direction and is located at a position of one circle of the outer periphery of the first mounting cavity;

[0040] A waterproof ring is annularly fixed on the outer periphery of the ring wall mating portion;

[0041] When the mating connector is mated with the plug connector, the ring wall mating portion is inserted into the mating ring cavity, and the waterproof ring is limited in the mating ring cavity.

[0042] Compared with the prior art, the beneficial effect of the present application is that it can prevent the terminal assembly from rotating relative to the insulating shell. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is a perspective view of the electrical connector combination of the present application, specifically showing a perspective view of the plug connector and the mating connector after being mated.

[0044] Figure 2 is a perspective view of the electrical connector combination of the present application, specifically showing a perspective view of the plug connector and the mating connector before being mated.

[0045] Figure 3 is a perspective view of the plug connector of the present application.

[0046] Figure 4 is a partial perspective exploded view of the plug connector of the present application, mainly showing the cooperation between the rotation-stopping member and the insulating shell.

[0047] Figure 5 is Figure 4 is an enlarged view of the structure in the dashed box in

[0048] Figure 6 is a bottom view of the plug connector of the present application.

[0049] Figure 7 is a sectional view of the plug connector of the present application along Figure 6 line A-A, specifically showing a sectional view of the cable assembly and the terminal assembly after being separated from the insulating shell, and the cooperation between the rotation-stopping member and the insulating shell.

[0050] Figure 8 is a sectional view of the plug connector of the present application along Figure 6 line B-B. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0052] In the description of the present application, it should be understood that the terms "comprise" and "have" and any variations thereof used in this text are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units need not be limited to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0053] Please refer to Figure 1 and Figure 2 , a connector assembly disclosed in the present application is shown, which comprises a mating plug connector 100 and a mating connector 500 (or called a socket connector). Referring to Figures 3 to 8 , the plug connector 100 comprises an insulating housing 1, a terminal assembly 2, a cable assembly 3 and a rotation-stopping member 4. Specifically, the insulating housing 1 is formed with a first mounting cavity 101 and a second mounting cavity 102 which are in communication with each other, one end of the first mounting cavity 101 is formed with a first mounting opening 1011, and one end of the second mounting cavity 102 is formed with a second mounting opening 1021. The insulating housing 1 in the embodiment of the present application is substantially L-shaped, wherein the first mounting cavity 101 and the second mounting cavity 102 are substantially perpendicular to each other.

[0054] Further, the terminal assembly 2 is provided with an insulating inner housing 21 and a plurality of terminals 22 fixedly combined with the insulating inner housing 21. The terminal assembly 2 is assembled into the first mounting cavity 101 through the first mounting opening 1011. The rotation-stopping member 4 is inserted into and mounted in the first mounting cavity 101 through the first mounting opening 1011, and comprises a rotation-stopping portion 41 and a fastening portion 42 (in the embodiment shown in the figure, the rotation-stopping portion 41 and the fastening portion 42 are one-piece structure). One end of the cable assembly 3 is assembled into the second mounting cavity 102 through the second mounting opening 1021, and the end portion thereof extends into the first mounting cavity 101 and is electrically connected with the plurality of terminals 22. The fastening portion 42 is implanted in the second mounting cavity 102 adjacent to the first mounting cavity 101 and is tightly fastened on the periphery of the cable assembly 3. The rotation-stopping portion 41 is assembled in the first mounting cavity 101 adjacent to the second mounting cavity 102.

[0055] Please refer to Figures 3 to 5 , Figure 7 and Figure 8 , the inner wall surface of the first mounting cavity 101 is formed with a stop portion (not numbered), the rotation-stopping portion 41 corresponds to and abuts against the stop portion (not numbered) and is configured to be unable to rotate relative to the insulating housing 1. Through the cooperation of the stop portion and the rotation-stopping portion 41, the rotation of the cable assembly 3 relative to the insulating housing 1 is prevented.

[0056] In a preferred embodiment, the inner wall surface of the first mounting cavity 101 comprises a planar bottom wall surface 1012 opposite to the first mounting opening 1011 and a planar side wall surface 1013 arranged at an angle with the bottom wall surface 1012. The rotation-stopping portion 41 comprises a planar bottom plate portion 411 abutting against the bottom wall surface 1012 and a planar side plate portion 412 integrally connected with the bottom plate portion 411 and abutting against the side wall surface 1013.

[0057] In a preferred embodiment, the side wall surface 1013 is formed with two and intersects the left and right sides of the bottom wall surface 1012 respectively. The side plate part 412 is formed with two and connected to the left and right sides of the bottom plate part 411 respectively, and the two side plate parts 412 are respectively correspondingly attached to the two side wall surfaces 1013. In a preferred embodiment, the side wall surface 1013 is perpendicular to the bottom wall surface 1012.

[0058] Further, the inner wall surface of the first mounting cavity 101 further includes end wall surfaces 1014 which respectively intersect the front and rear sides of the bottom wall surface 1012, and the end wall surfaces 1014 are formed with two, each of the end wall surfaces 1014 is perpendicular to the bottom wall surface 1012, and each of the end wall surfaces 1014 is perpendicular to the side wall surface 1013. The second mounting cavity 102 is recessed formed in the end wall surface 1014, and the second mounting cavity 102 is through to the outside.

[0059] It should be noted that in the present application, the above-mentioned attachment does not specifically mean complete contact without gap, but also includes the case that there is a small gap between the two (such as between the bottom plate part 411 and the bottom wall surface 1012, and between the side plate part 412 and the side wall surface 1013) without complete contact. For example, when there is an assembly tolerance, or the flatness of the bottom plate part 411 and / or the side plate part 412 cannot meet the design requirements, or the flatness of the corresponding bottom wall surface 1012 and side wall surface 1013 cannot be completely matched. Even so, it is still possible to achieve the effect of preventing the cable assembly 3 from rotating relative to the insulating shell 1 in the present application. Similarly, the relative rotation in the present application does not specifically mean that it is theoretically impossible to rotate relative to each other. Because of the existence of the above-mentioned flatness, design tolerance and other conditions, the cable assembly 3 cannot rotate relative to the insulating shell 1 in the present application, and the stopper 41 does not exceed the maximum bearing force of its deformation. In the case that the cable assembly 3 rotates relative to the insulating shell 1 by not more than 15 degrees, it also belongs to the innovative purpose of the present application.

[0060] Please refer to Figure 3 , Figure 4 and Figure 7As shown, the terminal assembly 2 is further formed with a snap wall 23. One end of the snap wall 23 is integrally connected with the outer surface of the left and right ends of the insulating inner shell 21, and the other end is cantilevered and formed with a snap hook portion 231. A deformation gap 230 is formed between the snap wall 23 and the outer surface of the left and right ends of the corresponding insulating inner shell 21. A matching groove 1017 is recessed on the side wall surface 1013 of the insulating outer shell 1, and the matching groove 1017 is open to the first mounting port (1011) side. The snap wall 23 is accommodated in the matching groove 1017, and the snap hook portion 231 is locked with the snap portion 1015 and is configured to prevent the terminal assembly 2 from being separated from the insulating outer shell 1. In one embodiment, the snap portion 1015 is a groove recessed further inward from the inner wall surface of the matching groove 1017, and in one embodiment, the snap portion 1015 is a convex structure protruding further outward from the inner wall surface of the matching groove 1017.

[0061] Please refer to Figures 1 to 8 As shown, the outer side surface of the left and right sides of the insulating outer shell 1 is further formed with a locking arm 11. The locking arm 11 includes a middle section 111, an operation section 112 further extending from the front end of the middle section 111 in the insertion direction of the mating connector 500, and a locking section 113 further extending from the rear end of the middle section 111 in the insertion direction of the mating connector 500. The middle section 111 is integrally connected with the outer side surface of the left and right sides of the insulating outer shell 1 on both sides of the middle section 111 by providing two connecting arms 12. A deformation space 110 is formed between the middle section 111 and the outer side surface of the left and right sides of the insulating outer shell 1. When the operation section 112 is pressed towards the outer side surface of the insulating outer shell 1, the locking arm 11 can be deflected away from the outer side surface of the insulating outer shell 1. The locking arm 11 is mainly used for locking and fixing the plug connector 100 after being mated with the mating connector 500.

[0062] Please refer to Figure 1 and Figure 2As shown, the mating connector 500 is formed with a housing member 51 and mating terminals 52 combined in the housing member 51. The housing member 51 comprises a base 511, a ring wall mating portion 512 further extended from an end surface of the base 511, and a mating locking arm 513 integrally connected with the end surface of the base 511. The ring wall mating portion 512 and the base 511 jointly define a mating cavity 510 open at one end, and one end of each of the mating terminals 52 protrudes into the mating cavity 510 in a cantilevered manner. One end of the mating locking arm 513 is integrally connected with the base 511, and the other end of the mating locking arm 513 is cantilevered. The mating locking arm 513 is located outside the ring wall mating portion 512 and is spaced apart from the outer surface of the ring wall mating portion 512. When the mating connector 500 is mated with the plug connector 100, the locking segment 113 of the locking arm 11 can be locked with the mating locking arm 513, and is configured to prevent the mating connector 500 from being separated from the plug connector 100.

[0063] In the preferred embodiment of the present application, the free end of the locking segment 113 protrudes to form a mating hook portion 1131 towards the corresponding outer side surface of the insulating housing 1, and the free end of the mating locking arm 513 protrudes to form a matching hook portion 5131 away from the ring wall mating portion 512. When the mating connector 500 is mated with the plug connector 100, the mating hook portion 1131 is locked with the matching hook portion 5131. In a more preferred embodiment, the free end of the mating locking arm 513 can also be elastically swung (with the end of the mating locking arm 513 connected with the base 511 as the fulcrum). During the entire process of mating the mating connector 500 with the plug connector 100, after the free end of the mating locking arm 513 is inserted into the deformation space 110, the free end of the mating locking arm 513 will first swing towards the side close to the corresponding outer side surface of the insulating housing 1, and at the same time, the locking segment 113 will first swing towards the side away from the corresponding outer side surface of the insulating housing 1. Then, the free end of the mating locking arm 513 abuts against the corresponding outer side surface of the insulating housing 1, and in this process, the locking segment 113 still swings towards the side away from the corresponding outer side surface of the insulating housing 1. Until the mating connector 500 is completely mated with the plug connector 100, the free end of the mating locking arm 513 will swing back towards the side away from the corresponding outer side surface of the insulating housing 1, and at the same time, the locking segment 113 will swing back towards the side close to the corresponding outer side surface of the insulating housing 1, and the mating hook portion 1131 is locked with the matching hook portion 5131. Thus, the mating connector 500 and the plug connector 100 are finally locked.

[0064] Further, the front end surface of the insulating shell 1 along the mating direction is also recessed to form a mating ring cavity 1016, which is located at a position of one circle of the outer periphery of the first mounting cavity 101. The outer periphery of the ring wall mating portion 512 is fixed with a waterproof ring 53 (such as a silica gel waterproof ring). When the plug connector 500 is mated with the plug connector 100, the ring wall mating portion 512 is inserted into the mating ring cavity 1016, and the waterproof ring 53 is limited in the mating ring cavity 1016 to achieve the waterproof function. Of course, in a more preferable embodiment, a waterproof ring 54 (such as a silica gel waterproof ring) can also be arranged between the outer periphery of the cable assembly 3 and the inner wall surface of the second mounting cavity 102 to achieve the waterproof function.

[0065] The assembly method of the plug connector will be briefly introduced below, which includes the following steps:

[0066] First step: the cable assembly 3 is inserted from the second mounting port 1021 and sequentially passes through the second mounting cavity 102 and the first mounting cavity 101 to exit from the first mounting port 1011.

[0067] Second step: the rotation stopping member 4 is locked on the cable assembly 3 (that is, the fastening portion 42 is sleeved and fastened on the outer periphery of the cable assembly 3), and then the free end wire of the cable assembly 3 is electrically connected with the terminal assembly 2 (the free end wire of the cable assembly 3 can be fastened with the mating terminal 52 first, and then the mating terminal 52 is inserted and assembled into the insulating inner shell 21).

[0068] Third step: the cable assembly 3 is pulled back to exit a part of length from the second mounting port 1021, and the fastening portion 42 is simultaneously implanted into the first mounting cavity 101 through the first mounting port 1011; then the fastening portion 42 is implanted into the second mounting cavity 102 adjacent to the first mounting cavity 101 through position adjustment, and the rotation stopping portion 41 is simultaneously assembled in the first mounting cavity 101 adjacent to the second mounting cavity 102, until the side plate portion 412 is correspondingly attached to the side wall surface 1013 and the bottom plate portion 411 is correspondingly attached to the bottom wall surface 1012.

[0069] Fourth step: finally, the terminal assembly 2 is implanted into the first mounting cavity 101 through the first mounting port 1011, until the locking arm 11 is locked with the mating locking arm 513.

[0070] Of course, the assembly method can also be as follows:

[0071] First step: the cable assembly 3 is inserted from the second mounting port 1021 and sequentially passes through the second mounting cavity 102 and the first mounting cavity 101 to exit from the first mounting port 1011.

[0072] Step 2: Secure the anti-rotation component 4 to the cable assembly 3 (that is, secure it to the outside of the cable assembly 3 by means of the fastening part 42).

[0073] Step 3: Pull back the cable assembly 3 so that it exits a portion of its length from the second mounting port 1021. Simultaneously, the fastening part 42 is inserted into the first mounting cavity 101 through the first mounting port 1011. Then, by adjusting its position, the fastening part 42 is inserted into the second mounting cavity 102 at a position adjacent to the first mounting cavity 101. Simultaneously, the anti-rotation part 41 is assembled in the first mounting cavity 101 at a position adjacent to the second mounting cavity 102, until the side plate part 412 is respectively attached to the side wall surface 1013 and the bottom plate part 411 is respectively attached to the bottom wall surface 1012.

[0074] Step 4: Connect the free end wire of cable assembly 3 to terminal assembly 2 electrically (you can first fasten the free end wire of cable assembly 3 to the mating terminal 52, and then insert the mating terminal 52 into the insulating inner shell 21).

[0075] Step 5: Then, the terminal assembly 2 is inserted into the first mounting cavity 101 through the first mounting port 1011 until the locking arm 11 and the docking locking arm 513 are locked together.

[0076] Of course, due to the structure of the plug connector of this application, in the preferred embodiment, the first mounting cavity 101 has a reserved space near the second mounting cavity 102. Figure 8 As can be seen schematically, the space between the base plate 411 and the insulating inner shell 21 is used to accommodate the end area of ​​the cable assembly 3.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this design, and not to limit it. Although the design has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this design.

[0078] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plug connector, comprising: an insulating housing (1) formed with a first mounting cavity (101) and a second mounting cavity (102) in communication with each other, one end of the first mounting cavity (101) forming a first mounting opening (1011), one end of the second mounting cavity (102) forming a second mounting opening (1021); a terminal assembly (2) provided with an insulating inner housing (21) and a plurality of terminals (22) fixedly combined with the insulating inner housing (21), the terminal assembly (2) being assembled into the first mounting cavity (101) through the first mounting opening (1011); a cable assembly (3) assembled into the second mounting cavity (102) through the second mounting opening (1021) and having an end portion extending into the first mounting cavity (101) and electrically connected with the plurality of terminals (22); a rotation-stopping member (4) inserted into and mounted in the first mounting cavity (101) through the first mounting opening (1011), comprising a rotation-stopping portion (41) and a fastening portion (42) fixedly connected with each other, wherein the fastening portion (42) is implanted in the second mounting cavity (102) adjacent to the first mounting cavity (101) and is sleeved and fastened on the periphery of the cable assembly (3), and the rotation-stopping portion (41) is assembled in the first mounting cavity (101) adjacent to the second mounting cavity (102), characterized in that: an inner wall surface of the first mounting cavity (101) is formed with a stop portion, and the rotation-stopping portion (41) is configured to be unable to rotate relative to the insulating housing (1) by abutting against the stop portion.

2. The plug connector of claim 1, wherein: the inner wall surface of the first mounting cavity (101) comprises a planar bottom wall surface (1012) opposite to the first mounting opening (1011) and a planar side wall surface (1013) arranged at an angle with the bottom wall surface (1012); the rotation-stopping portion (41) comprises a planar bottom plate portion (411) abutting against the bottom wall surface (1012) and a planar side plate portion (412) integrally connected with the bottom plate portion (411) and abutting against the side wall surface (1013).

3. The plug connector of claim 2, wherein: the side wall surface (1013) is formed with two side wall surfaces respectively intersecting with left and right sides of the bottom wall surface (1012); the side plate portion (412) is formed with two side plate portions respectively connected with left and right sides of the bottom plate portion (411), and the two side plate portions (412) are respectively abutted against the two side wall surfaces (1013).

4. The plug connector of claim 2, wherein: the side wall surface (1013) is perpendicular to the bottom wall surface (1012).

5. The plug connector of claim 3, wherein: the inner wall surface of the first mounting cavity (101) further comprises end wall surfaces (1014) respectively intersecting with front and rear sides of the bottom wall surface (1012), and the end wall surfaces (1014) are formed with two end wall surfaces each perpendicular to the bottom wall surface (1012) and each perpendicular to the side wall surface (1013); the second mounting cavity (102) is recessed in the end wall surfaces (1014).

6. The plug connector of claim 3, wherein, further comprising: A buckle wall (23) integrally connected with the outer surface of the left and right ends of the insulating inner shell (21) at one end and formed with a hook portion (231) at the other end in a cantilevered manner; A deformation gap (230) formed between the buckle wall (23) and the outer surface of the left and right ends of the corresponding insulating inner shell (21); A fitting groove (1017) recessed on the side wall surface (1013) of the insulating outer shell (1) and open to the first mounting port (1011) side; A buckle portion (1015) formed in the fitting groove (1017), when the terminal assembly (2) is assembled into the first mounting cavity (101) through the first mounting port (1011), the buckle wall (23) is correspondingly accommodated in the fitting groove (1017), the hook portion (231) is locked with the buckle portion (1015) and configured to prevent the terminal assembly (2) from being separated from the insulating outer shell (1).

7. The plug connector of claim 6, wherein: The buckle portion (1015) is a groove recessed further inward from the inner wall surface of the fitting groove (1017).

8. The plug connector according to any one of claims 1 to 7, characterized in that Further comprising: A locking arm (11) formed on the outer side surface of the left and right sides of the insulating outer shell (1), the locking arm (11) comprising a middle section (111), an operation section (112) further extended from the front end of the middle section (111) in the insertion direction of the mating connector, and a locking section (113) further extended from the rear end of the middle section (111) in the insertion direction of the mating connector; A connecting arm (12) integrally connecting the middle section (111) with the outer side surface of the left and right sides of the insulating outer shell (1) on both sides of the middle section (111); A deformation space (110) formed between the middle section (111) and the outer side surface of the left and right sides of the insulating outer shell (1); When the operation section (112) is pressed towards the outer side surface of the insulating outer shell (1), the locking arm (11) can be deflected away from the outer side surface of the insulating outer shell (1).

9. A connector assembly comprising the plug connector of claim 8, characterized in that Further comprising: A mating connector (500) formed with a shell member (51) and mating terminals (52) combined in the shell member (51); The shell member (51) comprises a base portion (511), a ring wall mating portion (512) further extended from one end surface of the base portion (511), and a mating locking arm (513) integrally connected with one end surface of the base portion (511); The ring wall mating portion (512) and the base portion (511) jointly define a mating cavity (510) open to one end, and one end of each mating terminal (52) protrudes into the mating cavity (510) in a cantilevered manner; One end of the mating locking arm (513) is integrally connected with the base portion (511), and the other end of the mating locking arm (513) is in a cantilevered manner, and the mating locking arm (513) is located outside the ring wall mating portion (512) and is spaced apart from the outer surface of the ring wall mating portion (512); When the mating connector (500) is mated with the plug connector (100), the locking section (113) of the locking arm (11) can be locked with the mating locking arm (513), and is configured to prevent the mating connector (500) from being separated from the plug connector (100).

10. The connector assembly of claim 9, wherein, Also included are: a mating ring cavity (1016) recessed on the front end surface of the insulating housing (1) in the mating direction and located at a position of one circle of the outer periphery of the first mounting cavity (101); a waterproof ring (53) annularly fixed to the outer periphery of the ring wall mating portion (512); When the mating connector (500) is mated with the plug connector (100), the ring wall mating portion (512) is inserted into the mating ring cavity (1016), and the waterproof ring (53) is limited in the mating ring cavity (1016).

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