Plug and servo motor

Abstract

A plug and servo motor, comprising a shell provided with a containing cavity, a rubber core vertically penetrating to form a terminal hole, a conductive terminal inserted into the terminal hole, and a cable connected with the conductive terminal in the containing cavity, a lateral inner wall of the containing cavity of the shell is recessed to form a matching groove on the upper side, the rubber core comprises a wire containing part and a butt joint part protruding downward from the wire containing part, a lateral outer wall of the wire containing part extends upward to form an elastic arm, and an upper end of the elastic arm is provided with a second matching step which is clamped into the matching groove. The rubber core of the plug of the application is locked with the shell stably.

Description

Technical Field

[0001] This utility model relates to the field of electrical connectors, and more particularly to a plug and a servo motor. Background Technology

[0002] A utility model patent published in the People's Republic of China with announcement number CN210744236 U discloses a female connector. This female connector includes a housing and a female inner core. The housing has a receiving cavity with slots on two opposite walls. The female inner core has elastic arms on opposite sides, and a locking block on the side of each elastic arm closest to the cavity wall. The female inner core is installed within the receiving cavity, and the locking block engages with the slot. Due to limitations such as the lever arm length, the elastic arms on the female inner core are prone to breakage during engagement, resulting in insufficient reliability.

[0003] Utility model patent CN212908186U of the People's Republic of China discloses a female terminal structure for a servo motor. The female terminal includes a pin section, a connecting plate, and a wire connection section for connecting wires. The pin section includes a base plate, a first side plate, and a second side plate. The first side plate and the second side plate are fixedly connected to the base plate, arranged opposite each other. The side of the first side plate is fixedly connected to the connecting plate. The connecting plate and the first side plate are integrally formed into a flat plate structure by stamping. The end of the wire connection section is fixedly connected to the connecting plate. The pin section, the connecting plate, and the wire connection section form an "L" shape. This solution solves the problem of cracking caused by directly bending the wire connection section from the top of the base plate. Using this solution eliminates the need to bend the wire connection section. However, the wire connection section is oriented left-right, requiring the cable to be inserted into the wire connection section from the left or right side and crimped. Compared to crimping the wire vertically, this results in a more complex process and increased lateral space occupation. Utility Model Content

[0004] Therefore, it is necessary to provide a plug and servo motor that provide a stable locking mechanism between the core and the housing.

[0005] To solve the above-mentioned technical problems, this application provides a plug, including a housing with a receiving cavity, a rubber core with a terminal hole formed vertically through it, a conductive terminal inserted into the terminal hole, and a cable connected to the conductive terminal in the receiving cavity. The receiving cavity of the housing has a mating groove recessed on the upper side. The rubber core includes a wire receiving portion and a mating portion protruding downward from the wire receiving portion. The outer side wall of the wire receiving portion extends upward to form an elastic arm. The upper end of the elastic arm is provided with a second mating step that engages with the mating groove.

[0006] Preferably, the mating groove is provided with a horizontal first mating step, and the second mating step is engaged and locked with the first mating step after being inserted into the mating groove.

[0007] Preferably, the first mating step and the inner wall of the accommodating cavity of the outer shell are provided with matching guide slopes. The guide slope on the elastic arm is squeezed by the guide slope on the inner wall of the accommodating cavity, causing the elastic arm to deform and be inserted into the mating groove.

[0008] Preferably, the elastic arm further includes an arm body that extends independently upward, the second mating step is provided at the upper end of the arm body, the elastic arm is part of the transverse outer wall of the receiving part of the rubber core, and the elastic arm is separately disposed from the rest of the transverse outer wall.

[0009] Preferably, the transverse inner wall of the accommodating cavity is further provided with a tool groove extending from the bottom into the mating groove, and the width of the tool groove is not greater than half the width of the mating groove.

[0010] Preferably, the lateral side of the rubber core is provided with a pair of dead-lock protrusions on both sides of the elastic arm, and the inner wall surface of the housing cavity is provided with a pair of dead-lock grooves corresponding to the dead-lock protrusions, and the dead-lock protrusions are engaged in the dead-lock grooves.

[0011] Preferably, both the mating groove and the dead lock groove are located on the upper side of the transverse inner wall of the accommodating cavity, while the lower side of the transverse inner wall of the accommodating cavity is recessed outward to form a locking groove, and a guide slope is formed on the side of the locking groove near the accommodating cavity.

[0012] Preferably, the terminal hole includes a vertical hole that penetrates the mating portion vertically and a wiring groove that penetrates the wire receiving portion longitudinally. The conductive terminal includes a pin segment fixed in the vertical hole, a connecting plate connected to the pin segment, and a wire connecting segment extending from the connecting plate and forming an L-shape with the pin segment. The wire connecting segment is placed in the wiring groove.

[0013] Preferably, the pin segment includes a base plate, a pair of side plates extending perpendicularly from both sides of the base plate, and a surrounding plate extending perpendicularly from one side plate toward the other side plate. The pin segment forms a cylindrical structure with a pin hole through the base plate, side plates, and surrounding plate. A connecting plate covers the pin hole. A pair of contact spring arms are provided on the pair of side plates. The connecting plate is formed by perpendicularly bending from the top of one side plate toward one side of the other side plate. The wire connecting segment extends from one end of the connecting plate and forms an L-shaped structure with the pin segment. The width of the side plate is greater than the width of the base plate. The connecting plate covers the top of the pin segment. The wire connecting segment lies longitudinally in any direction of the wiring groove.

[0014] Preferably, the bottom plate, side plate and enclosure plate have a lower support end formed at their lower edges. The bottom plate is punched outward to form a barb extending obliquely upward. The vertical hole of the terminal hole has a buckle groove formed through both sides. The top of the buckle groove has an upper abutment part, and the bottom of the vertical hole has a lower abutment part. The lower abutment part has an insertion hole for inserting a pin through the middle. The lower support end of the conductive terminal is supported on the lower abutment part around the insertion hole. The barb is held below the upper abutment part to prevent the conductive terminal from falling out of the terminal hole.

[0015] Preferably, a sealing groove is formed on the bottom surface of the outer wall of the accommodating cavity of the outer shell, and a sealing ring is provided on the sealing groove.

[0016] To solve the above-mentioned technical problems, this application also provides a servo motor, including a motor housing, electronic components assembled in the motor housing, a socket fixed to the motor housing and connected to the electronic components, and a plug. The plug is inserted into the socket. A sealing groove is formed on the bottom surface of the outer wall of the receiving cavity of the plug housing. A sealing ring is provided on the sealing groove. The sealing ring is clamped between the bottom surface of the plug and the surface of the socket to achieve a seal.

[0017] This application effectively solves the technical problem of not being able to set an independent elastic arm due to insufficient size of the rubber core by directly forming a mating groove on the transverse inner sidewall of the outer casing, directly using the transverse outer wall of the receiving portion of the rubber core as an elastic arm, and setting a mating step that engages and locks with the mating groove. It also eliminates the risk of breakage in the prior art where the elastic arm extending in the opposite direction is set on the sidewall of the rubber core. Attached Figure Description

[0018] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0019] Example 1

[0020] Figure 1 This is a perspective view of the servo motor plug in Embodiment 1;

[0021] Figure 2 This is an exploded perspective view of the servo motor plug in Embodiment 1;

[0022] Figure 3 This is a perspective view of the conductive terminals of the servo motor plug in Embodiment 1;

[0023] Figure 4 This is a perspective view of the conductive terminals of the servo motor plug in Embodiment 1 from another angle.

[0024] Figure 5 For along Figure 3 The cross-sectional view shown by the dashed DD line;

[0025] Figure 6 For along Figure 3 The cross-sectional view shown by the dashed line EE;

[0026] Figure 7 For along Figure 1 The cross-sectional view shown by the dashed line AA;

[0027] Figure 8 For along Figure 1 The cross-sectional view shown by the dashed line BB;

[0028] Example 2

[0029] Figure 9 This is an exploded perspective view of the servo motor plug in Embodiment 2;

[0030] Figure 10 This is a cross-sectional view of the plug locking part for the servo motor in Embodiment 2.

[0031] Example 3

[0032] Figure 11 This is a three-dimensional assembly diagram of the servo motor plug in Example 3;

[0033] Figure 12 This is an exploded perspective view of the servo motor plug in Example 3;

[0034] Figure 13 This is a perspective view of the rubber core of the plug for the servo motor in Example 3;

[0035] Figure 14 For along Figure 11 The cross-sectional view shown by the dashed CC line.

[0036] Example 4

[0037] Figure 15 This is an exploded perspective view of the servo motor plug in Example 4;

[0038] Figure 16 This is an exploded perspective view of the servo motor plug from another angle in Embodiment 4.

[0039] Explanation of reference numerals in the attached figures

[0040] Outer shell - 10; Top wall - 11; Outer wall - 12; Sealing groove - 121; Receiving hole - 122; Cable fixing part - 13; Through hole - 131; Locking groove - 14; Top surface - 141; Lateral side - 142; Longitudinal side - 143; Locking spring arm - 15; Spring arm body - 151; First locking step - 152; Guide slope - 153, 242; Locking space - 154; Receiving cavity - S; Glue core - 20; Connecting part - 21; Wire receiving part - 22; Terminal hole - 23; Lower abutment part - 231; Upper abutment part - 232; Pin hole - 233; Wiring 234; 235; 236; 24; 241; 30; 31; 31; 31; 312; 32; 32; 32; 33; 32; 33; 34; 34; 34; 35; 36; 37; 38; 40; 41; 42; 43; 44; 45; 46; 47; 38; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 40; 41; 42; 43; 40; 41; 42; 43; 49; 40; 41; 42; 43; 40; 51; 62; 73; 84; 95; 10; 11; 24; 12; 13; 14; 24; 15; 26; 37; 48; 49; 10; 12; 23; 40; 13; 14; 24; 35; 46; 14; 24; 39; 40; 12; 24; 39; 40; 12; 23; 44; 13; 24; 39; 40; 14; 24; 39; 40; 12; 24; 13; 24; 39; 40; 14; 24; 39; 40; 14; 24; 39; 40; 14; 24; 39; 40; 14; 24; 15; 26; 14; 24; 39; 4

[0041] Protruding locking block - 16; First locking step - 161; Guide ramp - 162, 254; Locking arm - 25; Base - 251; Cantilever - 252; Second locking step - 253; Isolation space - 255.

[0042] Mating groove-171; First mating step-172; Guide slope-173, 263; Tool groove-174; Dead lock groove-175; Elastic arm-26; Arm body-261; Second mating step-262; Dead lock protrusion-27. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0044] This application is based on Figure 1 The X direction is the vertical direction, the Y direction is the horizontal direction, and the Z direction is the vertical direction below.

[0045] Example 1

[0046] Please see Figures 1 to 8 The attached drawing of the servo motor plug according to Embodiment 1 of this application will be used to illustrate this. Figures 1 to 8 This document details the technical solution for the servo motor plug in Embodiment 1.

[0047] Please see Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, the servo motor plug of Embodiment 1 of this application includes a housing 10 with a receiving cavity S, a rubber core 20 inserted into the receiving cavity S, and a plurality of conductive terminals 30 inserted into the rubber core 20.

[0048] The outer casing 10 includes a top wall 11, a peripheral wall 12 extending downward from the outer edge of the top wall 11, a receiving cavity S enclosed by the top wall 11 and the peripheral wall 12, and a cable fixing part 13 provided on the peripheral wall 12. The cable fixing part 13 has a through hole 131 communicating with the receiving cavity S, and the through hole 131 is used for the cable to pass into the receiving cavity S. A sealing ring groove 121 is provided on the bottom surface of the peripheral wall 13, and a sealing ring is fixed in the sealing ring groove 121.

[0049] The cable fixing part 13 is disposed on a peripheral wall 12 in the longitudinal direction. Locking grooves 14 are provided on the inner walls of the accommodating cavity S on both transverse sides (i.e., the inner wall surfaces of the peripheral wall 12 on both transverse sides). The locking grooves 14 are recessed from the inner wall of the accommodating cavity S and include a top surface 141, a transverse side surface 142, and a longitudinal side surface 143. A pair of locking spring arms 15 extend downward from the top surface 141 of the two locking grooves 14 on both transverse sides. Each locking spring arm 15 includes a spring arm body 151 extending downward from the top surface 141, a first locking step 152 protruding from the pair of spring arm bodies 151, a guide slope 153 formed on the bottom side of the first locking step 152, and a locking space 154 formed between the pair of locking spring arms 15. The first locking step 152 partially closes the locking space 154.

[0050] The adhesive core 20 is inserted into the receiving cavity S. The adhesive core 20 includes a wire receiving portion 22, a mating portion 21 protruding downward from the wire receiving portion 22, and a terminal hole 23 extending vertically through the adhesive core 20. The terminal hole 23 includes a vertical hole 235 extending vertically through the mating portion 21 and a wiring groove 234 extending longitudinally through the wire receiving portion 22. A lower abutment portion 231 is formed at the bottom of the vertical hole 235, and an insertion hole 233 communicating with the terminal hole 23 is formed through the lower abutment portion 231. The vertical hole 235 in the mating portion 21 extends longitudinally through the side wall of the mating portion 21 and forms undercut grooves 236 on both longitudinal sides of the vertical hole 235. An upper abutment portion 232 is formed at the top of the undercut grooves 236.

[0051] The rubber core 20 has protruding locking blocks 24 on both sides that snap onto the locking spring arm 15. The locking blocks 24 have a triangular or trapezoidal structure. The bottom surface of the locking blocks 24 has a second locking step 241 that matches the first locking step 152 and another guiding slope 242 that corresponds to the guiding slope 153 of the locking spring arm 15. The locking blocks 24 are located on the outer side of the receiving part 22. Specifically, when the core 20 is inserted into the accommodating cavity S, the guide slope 242 of the locking block 24 contacts the guide slope 153 of the latch spring arm 15 and presses the pair of latch spring arms 15 on both sides longitudinally, causing the latch spring arms 15 to deform longitudinally. Finally, the second latch step 241 of the locking block 24 passes over the first latch step 152 of the latch spring arm 15. At this time, the latch spring arm 15 elastically returns and the first latch step 152 abuts against the lower side of the second latch step 241, positioning the locking block 24 within the latch space 154 and preventing it from moving.

[0052] This application uses a pair of locking spring arms 15 provided on the side wall of the outer casing 10 and a locking block 24 provided on the side wall of the rubber core 20 for locking. The locking block 24 is locked into the locking space 154 between the pair of locking spring arms 15. In addition to limiting the vertical position of the rubber core 20, it can also prevent the rubber core 20 from shaking longitudinally, thus solving the risk of easy breakage of the elastic arms provided on the side wall of the rubber core 20 in the prior art.

[0053] Please continue reading. Figures 3 to 6 As shown, the conductive terminal 30 in this embodiment includes a power terminal and a signal terminal. The size of the power terminal is larger than the size of the signal terminal. In this embodiment, the signal terminal is a conventional design, while the power terminal has undergone technical improvements. The conductive terminal 30 described in this embodiment refers to the power terminal.

[0054] The conductive terminal 30 includes a pin segment, a connecting plate 33 connected to the pin segment, and a wire connecting segment 34 connected to the connecting plate 33. The pin segment is generally cylindrical in shape and includes a base plate 31, side plates 32 formed by bending and extending laterally from both sides of the base plate 31, a retaining plate 35 formed by bending from one of the side plates 32 and extending toward the other side plate 32, and a contact spring arm 321 formed by tearing from the side plates 32. The base plate 31, the two side plates 32, and the retaining plate 35 enclose a cylindrical structure and form a pin space 38 within the cylindrical structure. A lower support end 36 is formed at the bottom of the cylindrical structure.

[0055] The contact spring arm 321 is formed by tearing from the side plate 32 and extending into the pin space. The structure of the contact spring arm 321 is prior art and will not be described in detail here. The width of the side plate 32 is greater than the width of the bottom plate 31 and the surrounding plate 35. The bottom plate 31 or the surrounding plate 35 has outwardly torn barbs 311, and the bottom plate 31 and the surrounding plate 35 have inwardly punched protrusions 312 near the contact point of the contact spring arm 321, which protrude into the pin space 38. The protrusions 312 can be used to limit the insertion of the pin terminal into the pin space 38, making the contact between the pin terminal and the contact spring arm 321 more stable. A gap 37 is formed between the surrounding plate 35 and one of the side plates 32. The connecting plate 33 is formed by bending the top of one side plate 32 towards the other side plate 32. The connecting plate 33 covers the pin space 38, preventing foreign objects from falling into the pin space 38. The wire connecting segment 34 extends from the connecting plate 33 and is connected parallel to the connecting plate 33 without bending at the connection point. The wire connecting segment 34 includes a cable-holding plate 341 that supports the cable and a core wire clamping part 342 and an insulation layer clamping part 343 formed by bending from both sides of the cable-holding plate 341. The core wire clamping part 342 is used to clamp the metal core wire of the cable, and the insulation layer clamping part 343 is used to clamp and fix the outer insulation layer of the cable.

[0056] Please see Figures 1 to 8 As shown, in this embodiment, the conductive terminal 30 bends the connecting plate 33 from the top of the side plate 32, and then extends the wire connecting segment 34 parallel to the connecting plate 33 to form a parallel rearward extension. This avoids the problem of the narrow wire connecting segment 34 being prone to cracking when bent, and also allows the wire connecting segment 34 to open upwards to facilitate the riveting operation of the cable. By adjusting the bending position to the wider side plate 32 and improving the design of the connecting plate 33, the problem of the wire connecting segment 34 being prone to cracking when bent is avoided while keeping it facing upwards.

[0057] The conductive terminal 30 is pressed into the terminal hole 23 of the core 20 from top to bottom. Specifically, the lower support end 36 of the bottom of the pin section is supported on the lower abutment portion 231 of the terminal hole 23 in four directions; the barb 311 is inserted into the lower side of the upper abutment portion 232 of the buckle groove 236 of the terminal hole 23 to fix the conductive terminal 30 in the terminal hole 23, while the wire connection section 34 is located in the wiring groove 234.

[0058] During assembly, several cables are first riveted to the conductive terminal 30, then the conductive terminal 30 is inserted and fixed into the terminal hole 23 of the core 20, and finally the cables are passed through the through hole 131 of the cable fixing part 13, and the core 20 is inserted into the receiving cavity S of the outer shell 10 and the core 20 is fixed together with the outer shell 10 by a buckle.

[0059] Example 2

[0060] Please continue reading. Figure 9 , Figure 10 As shown, the difference between Embodiment 2 and Embodiment 1 lies in the fastening structure between the core 20 and the outer shell 10. Specifically, the locking spring arm 15 is no longer provided in the locking groove 14 of the outer shell 10. Instead, a pair of protruding latches 16 are formed protruding from the two longitudinal sides 143 of the locking groove 14. The protruding latches 16 include a first holding step 161 on the upper surface and a guide slope 162 formed at the bottom of the protruding latches 16.

[0061] The outer lateral surface of the housing portion 22 of the core 20 is provided with a latching arm 25. The latching arm 25 includes a base 251 protruding outward from the outer lateral surface of the housing portion 22, a pair of cantilever arms 252 extending upward from both ends of the base 251, a second holding step 253 protruding outward from the upper end of the pair of cantilever arms 252, and a guide slope 254 formed on the outside of the second holding step 253. An isolation space 255 is formed between the pair of cantilever arms 252 to maintain the elastic deformation space of the pair of cantilever arms 252.

[0062] When the core 20 is inserted into the outer casing 10, the guide slopes 254 of the latching arms 25 on both sides of the core 20 and the guide slopes 162 of the protruding latch block 16 press against each other, causing the cantilever 252 to undergo elastic deformation and the second latching step 253 to elastically return after passing over the first latching step 161 of the protruding latch block 16, ultimately locking the second latching step 253 onto the upper surface of the first latching step 161.

[0063] This embodiment uses a pair of protruding latches 16 on the side wall of the outer casing 10 and a pair of latching arms 25 on the side wall of the core 20 for locking. The latching arms 25 are engaged between the pair of protruding latches 16, which not only limits the vertical position of the core 20, but also prevents the core 20 from shaking longitudinally, thus solving the risk of easy breakage of the elastic arms set on the side wall of the core 20 in the prior art.

[0064] In addition to the aforementioned beneficial effects, this embodiment has the following advantages compared to Embodiment 1: the elastic component is disposed on the core 20, and typically, the plastic material of the core 20 is better than that of the outer shell 10, making the elastic component less prone to damage. Furthermore, the outer shell 10 may also be made of metal; if metal is used, it would be impossible to place the elastic component on the outer shell 10.

[0065] Example 3

[0066] Please continue reading. Figures 11 to 14 As shown, in some smaller servo motor plugs, such as signal plugs, the method of setting elastic members on the outer side of the core 20 or the inner side of the housing 10 has the problem of insufficient size due to the small size.

[0067] Therefore, Embodiment 3 provides a locking scheme for a small-sized plug. The difference from Embodiment 1 is that an elastic arm 26 is directly formed on the transverse outer wall of the wire-receiving portion 22 of the core 20. Specifically, the middle portion of the transverse outer wall of the wire-receiving portion 22 is separated from the longitudinal sides to form an arm body 261. In one embodiment, if the width of the transverse outer wall of the wire-receiving portion 22 is moderate and the elasticity is suitable, the entire transverse outer wall of the wire-receiving portion 22 can be used as the arm body 261. The top of the arm body 261 protrudes laterally outward to form a second mating step 262, and the top surface of the second mating step 262 slopes downward to form a guide slope 263. The transverse inner wall of the accommodating cavity S of the outer shell 10 is recessed outward to form a mating groove 171 corresponding to the second mating step 262. The bottom surface of the mating groove 171 serves as the first mating step 172. The transverse inner wall of the outer shell 10 forms a guide slope 173 from bottom to top to engage with the guide slope 263. The guide slope 173 does not extend upward to the mating groove 171, so that the first mating step 172 has sufficient depth to engage with the second mating step 262.

[0068] During assembly, the core 20 is inserted upward into the receiving cavity S of the outer shell 10. First, the guide slope 263 on the outer side of the core 20 moves upward along the guide slope 173 of the outer shell 10. During this process, the arm body 261 of the elastic arm 26 gradually deforms inward and finally gets stuck in the mating groove 171. At this time, the second mating step 262 is locked on the first mating step 172.

[0069] To address the issue of removing the core 20, a tool groove 174 is provided on the transverse inner wall of the outer casing 10, extending upwards into the mating groove 171. Specifically, when it is necessary to remove the core 20, a tool is inserted from the tool groove 174 into the mating groove 171, pressing the arm 261 inwards to disengage the second mating step 262 from the first mating step 172 and allow it to exit. The width of the tool groove 174 is no greater than half the width of the elastic arm 26, and the tool groove 174 is located at the middle position of the mating groove 171.

[0070] This application also provides a servo motor, which includes a motor housing, electronic components assembled in the motor housing, and a socket fixed to the motor housing and connected to the electronic components. The plug is inserted into the socket. A sealing groove 121 is provided on the bottom surface of the outer wall of the receiving cavity of the plug housing. A sealing ring is provided on the sealing groove. The sealing ring is clamped between the bottom surface of the plug and the surface of the socket to achieve a seal.

[0071] Example 4

[0072] Examples 1 and 2 show power connectors for servo motors, while Example 3 shows an encoder connector for a servo motor. The encoder connector's dimensions are smaller than the power connector's, limiting its locking structure. However, the latching structure of the encoder connector shown in Example 3 can be applied to the power connectors shown in Examples 1 and 2. Please refer to [link / reference needed] for details. Figure 15 , Figure 16 As shown, the power plug of Embodiment 4 is an adaptation of the technical solution of Embodiment 3. Specifically, an elastic arm 26 is also directly provided on the transverse outer wall of the wire-receiving portion 22 of the core 20, and the specific structure of the elastic arm 26 is the same as that of Embodiment 3, which will not be described again here. The difference is that a pair of dead-locking protrusions 27 are also formed on the lower transverse sides of the elastic arm 26, and the dead-locking protrusions 27 are located on the side of the wire-receiving portion 22 near the docking portion 21.

[0073] The transverse inner wall surface of the accommodating cavity S of the outer shell 10 is provided with a mating groove 171 and a dead-lock groove 175 corresponding to the elastic arm 26 and the dead-lock protrusion 27. Specifically, the locking groove 14 is provided on the lower part of the transverse inner wall of the accommodating cavity S, while the upper part of the transverse inner wall of the accommodating cavity is only provided with the mating groove 171 and the dead-lock groove 175. A guide slope (not labeled) is provided on the side of the locking groove 14 adjacent to the accommodating cavity S.

[0074] This application sets up an elastic snap-fit ​​structure and then sets up a pair of dead snap structures on both sides of it, making the structure more suitable for larger power plugs and keeping the snap-fit ​​stable.

[0075] In Embodiment 4, a sealing ring 40 is provided within the sealing ring groove 121. The sealing ring groove 121 is recessed upward to form a plurality of receiving holes 122. The sealing ring 40 includes an annular sealing ring body 41, an insertion structure 43 protruding upward from the sealing ring body 41 and pressing into the receiving holes 122, and screw holes 42 formed between the insertion structures 43. By inserting the insertion structure 43 into the receiving holes 122, the sealing ring 40 is pre-fixed within the sealing ring groove 121 and will not easily fall off.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A plug, comprising a housing having a receiving cavity, a rubber core with a terminal hole formed perpendicularly through it, a conductive terminal inserted into the terminal hole, and a cable connected to the conductive terminal within the receiving cavity, characterized in that, The accommodating cavity of the outer shell has a recessed groove on the upper side of its transverse inner wall. The core includes a receiving part and a mating part that protrudes downward from the receiving part. The transverse outer wall of the receiving part extends upward to form an elastic arm. The upper end of the elastic arm is provided with a second mating step that engages with the mating groove.

2. The plug as claimed in claim 1, characterized in that, The mating groove is provided with a horizontal first mating step, and the second mating step is engaged and locked with the first mating step after being inserted into the mating groove.

3. The plug as described in claim 2, characterized in that, The first mating step and the inner wall of the accommodating cavity of the outer shell are provided with matching guide slopes. The guide slope on the elastic arm is squeezed by the guide slope on the inner wall of the accommodating cavity, causing the elastic arm to deform and get stuck in the mating groove.

4. The plug as described in claim 3, characterized in that, The elastic arm also includes an arm body that extends upward independently, and the second mating step is provided at the upper end of the arm body. The elastic arm is part of the transverse outer wall of the receiving part of the rubber core, and the elastic arm is separately disposed from the rest of the transverse outer wall.

5. The plug as claimed in claim 1, characterized in that, The transverse inner wall of the accommodating cavity is also provided with a tool groove that extends from the bottom into the mating groove, and the width of the tool groove is not greater than half the width of the mating groove.

6. The plug as claimed in claim 2, characterized in that, The lateral side of the rubber core is provided with a pair of dead buckle protrusions on both sides of the elastic arm, and the inner wall surface of the housing cavity is provided with a pair of dead buckle grooves corresponding to the dead buckle protrusions, and the dead buckle protrusions are engaged in the dead buckle grooves.

7. The plug as claimed in claim 6, characterized in that, Both the mating groove and the dead lock groove are located on the upper side of the transverse inner wall of the accommodating cavity, while the lower side of the transverse inner wall of the accommodating cavity is recessed outward to form a locking groove, and a guide slope is formed on the side of the locking groove near the accommodating cavity.

8. The plug as claimed in claim 7, characterized in that, The terminal hole includes a vertical hole that penetrates the mating portion vertically and a wiring groove that penetrates the wire receiving portion longitudinally. The conductive terminal includes a pin segment fixed in the vertical hole, a connecting plate connected to the pin segment, and a wire connecting segment extending from the connecting plate and forming an L-shape with the pin segment. The wire connecting segment is placed in the wiring groove.

9. The plug as claimed in claim 8, characterized in that, The pin segment includes a base plate, a pair of side plates extending perpendicularly from both sides of the base plate, and a surrounding plate extending perpendicularly from one side plate toward the other. The pin segment forms a cylindrical structure with a pin hole through the base plate, side plates, and surrounding plate. A connecting plate covers the pin hole. A pair of oppositely arranged contact spring arms are provided on the pair of side plates. The connecting plate is formed by perpendicularly bending from the top of one side plate toward one side of the other side plate. The wire connecting segment extends from one end of the connecting plate and forms an L-shaped structure with the pin segment. The width of the side plate is greater than the width of the base plate. The connecting plate covers the top of the pin segment. The wire connecting segment lies longitudinally in any direction of the wiring groove.

10. The plug as claimed in claim 9, characterized in that, The bottom plate, side plate, and enclosure plate have a lower support end formed at their lower edges. The bottom plate is stamped outward to form barbs extending obliquely upward. The vertical hole of the terminal hole has barbed grooves formed through both sides. The top of the barbed groove has an upper abutment portion, and the bottom of the vertical hole has a lower abutment portion. The lower abutment portion has an insertion hole for inserting a pin through its middle. The lower support end of the conductive terminal is supported on the lower abutment portion around the insertion hole. The barbs are held below the upper abutment portion to prevent the conductive terminal from falling out of the terminal hole.

11. The plug as claimed in claim 10, characterized in that, A sealing groove is provided on the bottom surface of the outer wall of the housing cavity. A sealing ring is provided on the sealing groove. The sealing groove is recessed upward to form a receiving hole. The sealing ring includes an annular sealing ring body pressed into the sealing ring groove and an extrusion structure protruding upward from the sealing ring body and extruding into the receiving hole.

12. A servo motor, characterized in that, The device includes a motor housing, electronic components assembled within the motor housing, a socket fixed to the motor housing and connected to the electronic components, and a plug as described in any one of claims 1-11. The plug is inserted into the socket, and a sealing groove is formed on the bottom surface of the outer wall of the receiving cavity of the plug housing. A sealing ring is provided on the sealing groove, and the sealing ring is clamped between the bottom surface of the plug and the surface of the socket to achieve a seal.

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