Expansion plug, expansion base, modular expansion interface and vehicle

Abstract

The utility model belongs to the technical field of vehicles, and discloses an expansion plug, an expansion base, a modular expansion interface and a vehicle, the modular expansion interface comprises the expansion plug and the expansion base which are in plug-in fit, the expansion plug is provided with an internal threaded hole, and the expansion plug can be connected with an expansion function piece through a stud inserted into the internal threaded hole. Therefore, the device adapts to different expansion function parts, and modularization is achieved. The expansion base is arranged on the base body, rapid connection between the expansion function part and the base body is achieved through insertion connection of the expansion plug and the expansion base, the first locking structure and the second locking structure which are matched with each other are arranged between the expansion plug and the expansion base, and locking between the expansion plug and the expansion base can be achieved. And the connection stability is kept.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to an expansion plug, an expansion base, a modular expansion interface, and a vehicle. Background Technology

[0002] Automobiles, as a primary means of transportation, are widely used in daily life and work. However, the hardware functionality of existing automobiles is relatively closed, only able to fulfill the original functions set within their lifespan, making it difficult to meet the diverse needs of consumers. Adding functions through aftermarket modifications is overly complicated, time-consuming, and labor-intensive, and can easily damage the original vehicle structure. Utility Model Content

[0003] One objective of this utility model is to provide an expansion plug that can reliably connect with an expansion base. Another objective is to provide an expansion base that can reliably connect with an expansion plug. A third objective is to provide a modular expansion interface that can reliably connect expansion functional components with the base. A fourth objective is to provide a vehicle that includes the above-mentioned modular expansion connector, which can meet the functional expansion needs of automobiles without damaging the original structure of the automobile.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] In a first aspect, this utility model provides an expansion plug, which includes a plug body and a first locking structure. The plug body includes a plug portion and an internal threaded hole. The plug portion is used to engage with a slot of an expansion base, and the internal threaded hole is used for threaded connection of a stud provided on the expansion functional component. The first locking structure is disposed on the plug body and has an unlocked state and a locked state. When the first locking structure is in the locked state, it is used to engage with a second locking structure of the expansion base.

[0006] In one embodiment, the first locking structure includes a snap-fit ​​member, and the insertion portion has a receiving groove. The snap-fit ​​member can extend or retract from the receiving groove. When the first locking structure is in the unlocked state, the snap-fit ​​member is at least partially retracted from the receiving groove. When the first locking structure is in the locked state, the snap-fit ​​member is at least partially extended from the receiving groove.

[0007] In one embodiment, the extension plug further includes a locking resilient member that abuts against or connects to the snap-fit ​​member, the locking resilient member causing the snap-fit ​​member to tend to extend out of the receiving slot.

[0008] In one embodiment, the plug body includes a main body and a limiting part. The internal threaded hole is formed on the main body. The insertion part is fixed to one end of the main body extending axially along the internal threaded hole. The two limiting parts are spaced apart on the outer periphery of the main body along the axial direction of the internal threaded hole, forming a limiting space between the two limiting parts. The snap-fit ​​member includes a claw and a mounting part. The mounting part is located within the limiting space, and the opposite ends of the mounting part are respectively engaged with the two limiting parts. The claw is disposed on the mounting part and can extend or retract into the receiving groove.

[0009] In one embodiment, the expansion plug further includes a housing, which is sleeved on the main body and the snap-fit ​​member and connected to the plug body. The snap-fit ​​member further includes a force-applying part, which protrudes from the mounting part on the side facing away from the main body. The housing has a clearance groove corresponding to the position of the force-applying part. When the first locking structure is in the locked state, the force-applying part protrudes at least partially from the clearance groove through the housing.

[0010] In one embodiment, two snap-fit ​​members are provided, which are radially symmetrically arranged on opposite sides of the plug body, and the locking elastic member is disposed between the two snap-fit ​​members.

[0011] In one embodiment, the connector is configured to be non-circular.

[0012] Secondly, this utility model embodiment provides an expansion base for cooperating with the aforementioned expansion plug. The expansion base includes a base body and a second locking structure. The base body includes a slot for inserting the plug portion of the expansion plug. The second locking structure is disposed on the base body and is used to lock into the first locking structure of the expansion plug.

[0013] In one embodiment, the extension base further includes a cover plate and a dustproof elastic element. The cover plate is slidably disposed in the slot, and the dustproof elastic element is located on the side of the cover plate facing away from the slot opening, so that the cover plate maintains a tendency to move towards the slot opening.

[0014] In one embodiment, the first locking structure includes a snap-fit ​​component, and the second locking structure includes a slot disposed on the inner wall of the slot for engaging with the snap-fit ​​component.

[0015] In one embodiment, the slot extends axially along the socket, and the cover plate is slidably connected to the base body via a sliding portion inserted into the slot.

[0016] In one embodiment, the sliding portion is configured as an arc-shaped sheet structure recessed away from the center of the slot, and / or the sliding portion is elastic.

[0017] Thirdly, this utility model embodiment provides a modular expansion interface, which includes any of the above-described expansion plugs and any of the above-described expansion bases that cooperate with the expansion plugs.

[0018] In one embodiment, both the expansion plug and the expansion base are made of metal.

[0019] Fourthly, this utility model embodiment provides a vehicle, the vehicle including a body, and also including any of the above-mentioned modular expansion interfaces, wherein the expansion base of the modular expansion interface is fixed to the vehicle body.

[0020] The beneficial effects of this utility model are:

[0021] The expansion plug proposed in this utility model can connect to the studs of the expansion functional component through an internal threaded hole, without being limited by the structure of the expansion functional component, achieving modular universality. It can also achieve quick connection with the expansion base through mutually cooperating plug-in parts and slots. The expansion base is set on the base body, thus realizing the quick connection between the expansion functional component and the base body. Furthermore, the expansion plug and expansion base are equipped with mutually cooperating first and second locking structures, improving the stability of the connection between the expansion functional component and the base body. The expansion plug and expansion base together form a modular expansion interface. Vehicles containing this modular expansion interface can meet diverse functional expansion needs of consumers without modification, and will not damage the original vehicle structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the modular expansion interface in an embodiment of this utility model (the expansion plug is not inserted into the expansion base);

[0023] Figure 2 This is a schematic diagram of the expansion plug in an embodiment of this utility model;

[0024] Figure 3 This is a cross-sectional view of the extension plug in an embodiment of this utility model;

[0025] Figure 4 This is an exploded view of the expansion plug in an embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the extension base in an embodiment of this utility model;

[0027] Figure 6 This is a cross-sectional view of the extension base in an embodiment of this utility model;

[0028] Figure 7 This is an exploded view of the extension base in an embodiment of this utility model;

[0029] Figure 8 This is a schematic diagram showing the connection relationship between the snap-fit ​​component and the base body in an embodiment of this utility model;

[0030] Figure 9 It is along Figure 8 A sectional view with the center section line;

[0031] Figure 10 This is a cross-sectional view of the modular expansion interface installed on the vehicle.

[0032] In the picture:

[0033] 10. Extension plug; 11. Plug body; 111. Main body; 1111. Internal threaded hole; 112. Plug-in part; 1121. Receiving groove; 113. Limiting part; 1131. Clearance notch; 12. First locking structure; 121. Mounting part; 122. Claw; 123. Connecting part; 124. Positioning pin; 125. Force-applying part; 13. Locking elastic element; 14. Housing; 141. Clearance groove; 142. Socket;

[0034] 20. Extension base; 21. Base body; 211. Slot; 22. Second locking structure; 23. Cover plate; 231. Sliding part; 24. Dustproof elastic element;

[0035] 30. Vehicle interior floor;

[0036] 40. Carpet. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] This invention proposes a modular expansion interface for mounting expansion components onto a base. The base includes, but is not limited to, vehicles such as automobiles and electric bicycles, or other functional devices such as cameras and desks. The expansion components can be various functional parts used inside or in a vehicle, such as tables, storage boxes, folding stands, pedals, storage boxes, umbrella holders, and anchor hooks. They can also be various functional parts that can be mounted on a camera, such as flashlights and GPS locators, or lamps used on a desk. Depending on the expansion component, the modular expansion interface can be placed in different locations on the base, such as the vehicle's floor, pillars, door panels, or roof.

[0042] refer to Figures 1-9As shown, the modular expansion interface includes an expansion plug 10 and an expansion base 20. The expansion plug 10 is used to connect with the expansion functional component, and the expansion base 20 is disposed on the base. The expansion plug 10 and the expansion base 20 are plugged into each other. The expansion plug 10 includes a plug body 11, which includes a plug portion 112 and an internal threaded hole 1111. The expansion base 20 includes a base body 21, which includes a slot 211. The base body 21 can be fixedly connected to the base by means including but not limited to bolt connection and adhesive bonding, and can also be rotatably or slidably connected to the base. The plug body 11 and the base body 21 can be connected through the plug portion 112 and the slot 211, thereby realizing the connection between the expansion functional component and the base. In order to maintain the connection stability between the plug body 11 and the base body 21, the expansion plug 10 also includes a first locking structure 12 disposed on the plug body 11, and the expansion base 20 includes a second locking structure 22 disposed on the base body 21. The first locking structure 12 can switch between an unlocked state and a locked state. When the first locking structure 12 is in the locked state, it is locked to the second locking structure 22; when the first locking structure 12 is in the unlocked state, it is separated from the second locking structure 22. It should be emphasized that the unlocked and locked states of the first locking structure 12 are relative to the second locking structure 22. Therefore, it is not necessarily the movement of the first locking structure 12 that causes it to switch between the unlocked and locked states; it is also possible that the movement of the second locking structure 22 causes it to switch between the unlocked and locked states.

[0043] The aforementioned modular expansion interface utilizes the plug-in expansion connector 10 and expansion base 20 to achieve quick connection between the expansion functional component and the base. The first locking structure 12 and the second locking structure 22 ensure a stable connection between the expansion connector 10 and the expansion base 20, improving the connection stability between the expansion functional component connected to the expansion connector 10 and the base connected to the expansion base 20. Furthermore, the expansion connector 10 connects to the expansion functional component via a stud inserted into the internal threaded hole 1111. The expansion functional component only needs a through hole for the stud to pass through. The modular expansion interface is not limited by the structure of the expansion functional component itself, enabling it to adapt to various types of expansion functional components and achieving modular versatility.

[0044] In one embodiment, to prevent the plug portion 112 from wobbling within the slot 211, the slot 211 and the plug portion 112 are engaged with each other, that is, along the direction perpendicular to the insertion of the plug portion 112 into the slot 211, the cross-sectional shape of the plug portion 112 is consistent with the cross-sectional shape of the slot 211.

[0045] In one embodiment, the first locking structure 12 includes a snap-fit ​​member, and the insertion portion 112 has a receiving groove 1121. The snap-fit ​​member can extend or retract at least partially into the receiving groove 1121. The second locking structure 22 includes a slot disposed in the slot 211. When the snap-fit ​​member extends out of the receiving groove 1121, it can snap into the slot to achieve locking. When the snap-fit ​​member retracts into the receiving groove 1121, it can disengage from the slot to achieve unlocking. That is, when the first locking structure 12 is in the locked state, the snap-fit ​​member extends at least partially out of the receiving groove 1121 and snaps into the slot. When the first locking structure 12 is in the unlocked state, the snap-fit ​​member retracts at least partially into the receiving groove 1121 and disengages from the slot.

[0046] In other embodiments, the first locking structure 12 may be a slot provided on the insertion part 112, and correspondingly, the second locking structure 22 may be a snap-fit ​​member that can be inserted into the receiving slot 1121.

[0047] The structure of the expansion plug 10 and the expansion base 20 will continue to be described based on the configuration of the first locking structure 12 as a snap-fit ​​and the second locking structure 22 as a slot.

[0048] refer to Figure 3 and Figure 4 As shown, the plug body 11 also includes a main body 111, wherein the main body 111 is cylindrical, and an internal threaded hole 1111 is formed on the main body 111 along the axial direction of the main body 111. The plug-in part 112 is coaxially disposed at one end of the axial direction of the main body 111. That is to say, the expansion function and the expansion base 20 can be connected to the opposite ends of the plug body 11 respectively, thereby minimizing interference between the expansion function and the base.

[0049] In one embodiment, the internal threaded hole 1111 can penetrate the main body 111 and extend further in the direction of the insertion part 112. Under the premise that the required internal threaded hole 1111 length is consistent, the overall height of the plug body 11 can be reduced, thereby reducing the space occupied by the extension plug 10.

[0050] Continue to refer to Figure 3 and Figure 4As shown, in order to limit the snap-fit ​​component along the axial direction of the main body 111, the plug body 11 also includes limiting portions 113. Two limiting portions 113 are spaced apart along the axial direction of the main body 111 on its outer periphery, forming a limiting space between them. The snap-fit ​​component includes a claw 122 and a mounting portion 121. The mounting portion 121 is arc-shaped and located within the limiting space, with its two axial ends respectively abutting against the two limiting portions 113. The claw 122 is disposed on the mounting portion 121 and can extend or retract from the receiving groove 1121 as the mounting portion 121 moves, thereby switching the first locking structure 12 between a locked state and an unlocked state. Specifically, the limiting portion 113 is configured as a limiting ring integrally formed with the main body 111.

[0051] To prevent the limiting part 113 from interfering with the movement of the claw 122, a clearance notch 1131 is provided on the limiting part 113 near the insertion part 112 to avoid the claw 122, through which the claw 122 passes. Specifically, the width of the clearance notch 1131 is the same as the width of the claw 122 to restrict the circumferential movement of the engaging member. More specifically, a hook is formed on the side of the claw 122 facing away from the receiving groove 1121, which can be engaged into the groove to achieve the engagement of the expansion plug 10 and the expansion base 20.

[0052] In one embodiment, the latching member further includes a connecting portion 123, which is disposed on the end face of the mounting portion 121 facing the insertion portion 112 and extends horizontally inward toward the main body portion 111 along the radial direction of the mounting portion 121. A claw 122 is fixed to the end of the connecting portion 123 extending inward toward the mounting portion 121. After the plug body 11 is inserted into the base body 21, the connecting portion 123 fits against the end face of the base body 21, limiting the depth of insertion of the plug body 11 into the base body 21. Furthermore, during the switching between the unlocked and locked states of the first locking structure 12, the latching member can move along the end face of the base body 21, allowing the claw 122 to accurately engage in the slot.

[0053] To achieve automatic locking between the latch and the slot, and to reduce the difficulty of locking the expansion plug 10 and the expansion base 20, the expansion plug 10 also includes a locking elastic element 13. The locking elastic element 13 causes the latch to maintain a tendency to move radially outward along the plug body 11. In one embodiment, the locking elastic element 13 is a compression spring. In other embodiments, the locking elastic element 13 may also be other elastic structures, such as elastic rubber.

[0054] In one embodiment, two latching members are provided, symmetrically arranged on opposite sides of the plug body 11. A locking elastic member 13 is disposed between the two latching members and abuts or connects to the latching members, so as to simultaneously maintain the tendency of the two latching members to move radially outward along the plug body 11. Two locking elastic members 13 are also provided, symmetrically arranged on opposite sides of the plug body 11, and each locking elastic member 13 is connected to both latching members to improve the stability of the latching members when moving relative to the plug body 11.

[0055] In order to achieve a stable connection between the snap-fit ​​component and the locking elastic element 13, based on the selection of a spring for the locking elastic element 13, the snap-fit ​​component also includes a positioning pin 124. The positioning pin 124 is located inside the mounting part 121, and the end of the spring is sleeved on the positioning pin 124 to prevent the spring from shifting.

[0056] For extended functional components that do not require rotation, the insertion part 112 is non-circular, and the slot 211 is also non-circular and engages with the insertion part 112. For example, for ease of manufacturing, both the insertion part 112 and the slot 211 are square. The non-circular insertion part 112 and slot 211 not only improve the stability of the connection between the plug body 11 and the base body 21 and enable automatic positioning of the snap-fit ​​component and the slot, but also withstand larger loads. Of course, in this case, the base body 21 is fixedly connected to the base.

[0057] As for the shape of the base body 21, it can be cylindrical or square, and can be set according to actual needs, and is not limited to the above-mentioned shapes. In one embodiment, the cross-section of the base body 21 is set as an inverted T-shape and connected to the base with bolts.

[0058] In one embodiment, both the plug-in portion 112 and the slot 211 are squares with chamfered corners, and slots are provided on all four sides of the slot 211. Two slots on opposite sides of the slot 211 form a group, which cooperate with two snap-fit ​​components. When the orientation between the expansion component and the expansion plug 10 is determined, the orientation of the expansion component relative to the base can be adjusted by snapping the snap-fit ​​components into different groups of slots, making it more flexible to use.

[0059] In one embodiment, the expansion plug 10 further includes a housing 14 connected to the plug body 11. The housing 14 is a cylindrical structure with one end open facing the insertion portion 112. The housing 14 is fitted over the main body 111 and the latching member to restrict the latch 122 from disengaging from the clearance notch 1131, thereby preventing the latching member from circumferentially moving relative to the main body 111 and maintaining the aesthetics of the expansion plug 10. Specifically, when the plug body 11 is inserted into the base body 21, the end face of the housing 14 facing the insertion portion 112 abuts against the end face of the base body 21, that is, the end face of the housing 14 facing the insertion portion 112 is flush with the end face of the mounting portion 121 facing the insertion portion 112, further limiting the insertion depth of the plug body 11 when inserted into the base body 21. Specifically, the inner diameter of the housing 14 is the same as the outer diameter of the mounting portion 121. When the first locking structure 12 is in the locked state, the outer surface of the mounting portion 121 is completely fitted with the inner surface of the housing 14.

[0060] To facilitate applying force to the latching component, the latching component also includes a force-applying part 125, which protrudes from the mounting part 121 on the side facing away from the main body 111. The outer casing 14 has a clearance groove 141 corresponding to the position of the force-applying part 125, extending to the end face of the outer casing 14 facing the insertion part 112. When the latching component is locked, the force-applying part 125 protrudes at least partially from the clearance groove 141 through the outer casing 14, making it easily identifiable. To unlock, simply pinch the force-applying part 125 with two fingers and apply force towards the inside of the outer casing 14; the latching component will then disengage from the latch, making unlocking convenient.

[0061] In one embodiment, a socket 142 is provided on one closed end face of the outer shell 14, and the end of the main body 111 away from the plug part 112 is inserted into the socket 142 and connected to the outer shell 14 by means including but not limited to interference connection and bonding. The limiting part 113 on the plug body 11 away from the plug part 112 abuts against the inner surface of the end of the outer shell 14 where the socket 142 is provided.

[0062] In one embodiment, in order to have a larger contact area between the expansion plug 10 and the expansion functional component and improve the support stability of the expansion plug 10 for the expansion functional component, the end face of the main body 111 inserted into the socket 142 is flush with the end face of the closed outer shell 14.

[0063] refer to Figures 5-7As shown, to prevent the slot 211 on the base body 21 from being blocked by foreign objects or to provide dust protection, the extension base 20 also includes a cover plate 23 and a dustproof elastic member 24. The cover plate 23 is slidably disposed within the slot 211, and the dustproof elastic member 24 is also located within the slot 211 and on the side of the cover plate 23 facing away from the slot 211. The dustproof elastic member 24 causes the cover plate 23 to maintain a tendency to move towards the slot 211. Specifically, the shape and size of the cover plate 23 are consistent with the size and shape of the slot 211, so as to completely seal the slot 211 when the extension plug 10 is not inserted.

[0064] When the plug body 11's insertion portion 112 is inserted into the slot 211 of the base body 21, the cover plate 23 overcomes the resistance of the dustproof elastic member 24 and moves towards the bottom of the slot 211; when the plug body 11's insertion portion 112 is pulled out of the base body 21, the cover plate 23 moves towards the opening of the slot 211 under the elastic force of the dustproof elastic member 24. The dustproof elastic member 24 can also be a spring.

[0065] In one embodiment, the slot extends axially along the slot 211, and the cover plate 23 is slidably connected to the base body 21 via a sliding part 231 inserted into the inner wall of the slot. When the sliding part 231 abuts against the slot wall near the opening of the slot 211, the cover plate 23 is flush with the end face of the base body 21. The slot limits the sliding stroke of the cover plate 23, preventing the cover plate 23 from detaching from the base body 21.

[0066] To enhance structural strength, all components of the expansion plug 10 and expansion base 20 are made of metal, such as 45 steel or aluminum castings. Furthermore, the sliding part 231 is designed as an arc-shaped sheet structure recessed away from the center of the slot 211. This allows for direct molding using an extrusion process and reduces friction between the sliding part 231 and the base body 21. Moreover, due to its material and shape characteristics, the arc-shaped sliding part 231 possesses a certain degree of elasticity, enabling effective contact with the base body 21 and reducing the likelihood of the cover plate 23 wobbling within the slot 211. Specifically, the sliding parts 231 are arranged in a one-to-one correspondence with the slots; for example, if four slots are provided, four sliding parts 231 are also provided, further improving the stability of the cover plate 23 sliding within the slots.

[0067] refer to Figure 10 As shown, an embodiment of this utility model also proposes a vehicle, which includes a body as the base and the aforementioned modular expansion interface. The modular expansion interface can be installed in any available location on the body, such as the interior floor 30, pillars, door panels, or roof.

[0068] Taking the modular expansion interface expansion base 20 installed on the vehicle interior floor 30 as an example, the vehicle interior floor 30 is provided with a mounting groove for accommodating the expansion base 20. The expansion base 20, placed in the mounting groove, is flush with the vehicle interior floor 30, avoiding any foreign object feeling. Optionally, the vehicle also includes a carpet 40, which covers the vehicle interior floor 30 and has through holes corresponding to the positions of the expansion base 20. The expansion base 20 is hidden under the carpet 40, resulting in a high degree of aesthetics.

[0069] Using the aforementioned modular expansion interfaces, vehicles can expand their functionality without modification, meeting the diverse needs of consumers.

[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An extension plug, characterized in that, include: The plug body (11) includes a plug portion (112) and an internal threaded hole (1111). The plug portion (112) is used to engage with the slot (211) of the expansion base (20), and the internal threaded hole (1111) is used for threaded connection of the studs provided on the expansion functional component. A first locking structure (12) is disposed on the plug body (11). The first locking structure (12) has an unlocked state and a locked state. When the first locking structure (12) is in the locked state, the first locking structure (12) is used to lock and engage with the second locking structure (22) of the extension base (20).

2. The expansion plug according to claim 1, characterized in that, The first locking structure (12) includes a snap-fit ​​member, and the insertion part (112) is provided with a receiving groove (1121). When the first locking structure (12) is in the unlocked state, the snap-fit ​​member is at least partially retracted into the receiving groove (1121). When the first locking structure (12) is in the locked state, the snap-fit ​​member is at least partially extended out of the receiving groove (1121).

3. The expansion plug according to claim 2, characterized in that, The extension plug also includes a locking elastic element (13), which abuts or connects with the snap-fit ​​member, causing the snap-fit ​​member to tend to extend out of the receiving groove (1121).

4. The expansion plug according to claim 3, characterized in that, The plug body (11) further includes a main body (111) and a limiting part (113). The internal thread hole (1111) is opened on the main body (111). The plug-in part (112) is fixed to one end of the main body (111) extending axially along the internal thread hole (1111). The two limiting parts (113) are spaced apart on the outer periphery of the main body (111) along the axial direction of the internal thread hole (1111). A limiting space is formed between the two limiting parts (113). The snap-fit ​​member includes a snap claw (122) and a mounting part (121). The mounting part (121) is located in the limiting space, and the opposite ends of the mounting part (121) are respectively attached to the two limiting parts (113). The snap claw (122) is disposed on the mounting part (121) and can extend or retract from the receiving groove (1121).

5. The expansion plug according to claim 4, characterized in that, The expansion plug also includes a housing (14), which is fitted over the main body (111) and the snap-fit ​​member and connected to the plug body (11). The snap-fit ​​member also includes a force-applying part (125), which protrudes from the mounting part (121) on the side facing away from the main body (111). The housing (14) has a relief groove (141) corresponding to the position of the force-applying part (125). When the first locking structure (12) is in the locked state, the force-applying part (125) at least partially protrudes from the housing (14) through the relief groove (141).

6. The expansion plug according to claim 3, characterized in that, Two snap-fit ​​components are provided, and the two snap-fit ​​components are symmetrically arranged on opposite radial sides of the plug body (11). The locking elastic element (13) is disposed between the two snap-fit ​​components.

7. The expansion plug according to any one of claims 1-6, characterized in that, The plug portion (112) is non-circular.

8. An extension base for engaging with any of the extension plugs described in claims 1-7, characterized in that, include: The base body (21) includes a slot (211) for inserting a plug (112) of an extension plug (10); A second locking structure (22) is provided on the base body (21), and the second locking structure (22) is used to lock and engage with the first locking structure (12) of the expansion plug (10).

9. The expansion base according to claim 8, characterized in that, The expansion base also includes a cover plate (23) and a dustproof elastic element (24). The cover plate (23) is slidably disposed in the slot (211). The dustproof elastic element (24) is located on the side of the cover plate (23) facing away from the slot (211), so that the cover plate (23) maintains a tendency to move towards the slot (211).

10. The extension base according to claim 9, characterized in that, The first locking structure (12) includes a snap-fit ​​component, and the second locking structure (22) includes a slot disposed in the inner wall of the slot (211) for snap-fitting with the snap-fit ​​component.

11. The extension base according to claim 10, characterized in that, The slot extends axially along the slot (211), and the cover plate (23) is slidably connected to the base body (21) via a sliding part (231) inserted into the slot.

12. The extension base according to claim 11, characterized in that, The sliding part (231) is configured as an arc-shaped sheet structure recessed in a direction away from the center of the slot (211), and / or the sliding part (231) is elastic.

13. A modular expansion interface, characterized in that, Includes the expansion plug as described in any one of claims 1-7 and any one of the expansion bases as described in claims 8-12 that mates with the expansion plug.

14. The modular expansion interface according to claim 13, characterized in that, Both the expansion plug and the expansion base are made of metal.

15. A vehicle, including a body, characterized in that, The vehicle further includes any of the modular expansion interfaces of claims 13-14, wherein the expansion base of the modular expansion interface is fixed to the vehicle body.

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