Speed reducer and speed reduction motor

Abstract

The application discloses a reduction gearbox and a reduction motor. The reduction gearbox comprises a box body, a first cavity, a second cavity and a third cavity connected in sequence, a first worm contained in the second cavity, a gear worm part contained in the first cavity, along the length direction of the gear worm part, the gear worm part is sequentially provided with a gear and a second worm connected in sequence, the gear is engaged with the first worm, a worm wheel contained in the third cavity, the worm wheel is engaged with the second worm, and a first elastic part contained in the first cavity and abutting between the inner wall of the first cavity and the gear worm part. In this way, the reduction motor applying the reduction gearbox can always maintain high transmission efficiency and low operation noise.

Description

Technical Field

[0001] This application relates to the field of automotive parts, and in particular to a gearbox and a geared motor. Background Technology

[0002] To assist occupants in easily entering and exiting the vehicle, pedal systems are typically installed on the chassis. These systems generally include fixed pedals and electric pedals. Electric pedals are popular because they automatically extend when the door is opened to facilitate entry and exit, and automatically retract when the door is closed to ensure vehicle maneuverability and aesthetics.

[0003] Existing electric pedals typically use geared motors with a self-locking function to prevent the pedal from accidentally extending when retracted, thus ensuring safe use. However, geared motors that achieve self-locking through worm gear transmission experience reduced transmission efficiency and increased noise after a period of use due to increased friction. Utility Model Content

[0004] The present application provides a gearbox and a geared motor that can solve the problem that in the prior art, the transmission efficiency of a geared motor that achieves self-locking transmission through a worm gear will decrease and the noise will increase due to increased friction after a period of use.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a gearbox, the gearbox comprising: a housing, including a first cavity, a second cavity, and a third cavity that are connected in communication; a first worm gear, housed in the second cavity, the first worm gear being used for transmission connection with the output end of a motor; a gear and worm gear assembly, housed in the first cavity, along the length direction of the gear and worm gear assembly, the gear and worm gear assembly being sequentially provided with a connected gear and a second worm gear, the gear meshing with the first worm gear; a worm wheel, housed in the third cavity, the worm wheel meshing with the second worm gear, the worm wheel being used for transmission connection with an output shaft; and a first elastic element, housed in the first cavity, the first elastic element abutting between the inner wall of the first cavity and the gear and worm gear assembly.

[0006] In some embodiments, the gearbox further includes a first support sleeve, which is sleeved on the end of the gear and worm gear. The first support sleeve includes a first base plate and a first peripheral wall extending from the edge of the first base plate. The end of the gear and worm gear passes through the first peripheral wall and abuts against the first base plate. The first base plate has a first snap-fit ​​structure on the side opposite to the first peripheral wall, and the first elastic member has a second snap-fit ​​structure. The first snap-fit ​​structure and the second snap-fit ​​structure snap-fit ​​together, so that the first support sleeve snaps into the first elastic member.

[0007] In some embodiments, the first cavity has a first limiting structure at the inner wall that abuts against the first elastic member, and the first elastic member has a second limiting structure at the end away from the first support sleeve. The first limiting structure and the second limiting structure are connected to limit the rotation of the first elastic member relative to the first cavity.

[0008] In some embodiments, the gearbox includes a second elastic element housed in the second cavity, the second elastic element being used to adjust the meshing clearance between the first worm and the gear.

[0009] In some embodiments, the gearbox includes a second support sleeve, the second support sleeve including a second base plate and a second peripheral wall extending from the edge of the second base plate, the second base plate having a third snap-fit ​​structure on the side opposite to the second peripheral wall, and the second elastic member having a fourth snap-fit ​​structure, the third snap-fit ​​structure snapping into the fourth snap-fit ​​structure, such that the second support sleeve snaps into the second elastic member.

[0010] In some embodiments, the second cavity is provided with a third limiting structure at the inner wall that abuts against the second elastic member, and a fourth limiting structure is provided at the end of the second elastic member away from the second support sleeve. The third limiting structure and the fourth limiting structure are connected to limit the rotation of the second elastic member relative to the second cavity.

[0011] In some embodiments, the length direction of the first worm and the width direction of the worm wheel are both parallel to a first direction, the length direction of the gear worm is parallel to a second direction, and in a third direction, the first worm and the worm wheel are located on the same side of the gear worm; or, the length direction of the first worm and the width direction of the worm wheel are both parallel to the first direction, the length direction of the gear worm is parallel to the second direction, and in a third direction, the first worm is located on one side of the gear worm, and the worm wheel is located on the other side of the gear worm; wherein, the first direction, the second direction, and the third direction are mutually perpendicular.

[0012] Another technical solution adopted in this application is: to provide a geared motor, the geared motor comprising: a motor and a gearbox as described in any of the above, the motor comprising an armature shaft, the armature shaft being connected to a first worm gear transmission of the gearbox.

[0013] In some embodiments, the motor includes a housing and two magnetic tiles fixed to the inner wall of the housing; or, the motor includes a housing and four magnetic tiles fixed to the inner wall of the housing.

[0014] In some embodiments, the gearbox includes a second cavity and a second elastic element, wherein the first worm and the second elastic element are both housed in the second cavity, and the second elastic element abuts against the armature shaft between the armature shaft and the inner wall of the second cavity.

[0015] The beneficial effects of this application are as follows: Unlike existing technologies, the gearbox provided in this application includes: a housing comprising a first cavity, a second cavity, and a third cavity that are connected in series; a first worm gear housed in the second cavity, the first worm gear being used for transmission connection with the output end of a motor; a gear-worm gear assembly housed in the first cavity, along the length direction of the gear-worm gear assembly, the gear-worm gear assembly being sequentially provided with a connected gear and a second worm gear, the gear meshing with the first worm gear; a worm wheel housed in the third cavity, the worm wheel meshing with the second worm gear, the worm wheel being used for transmission connection with an output shaft; and a first elastic element housed in the first cavity, the first elastic element abutting against the inner wall of the first cavity between the gear-worm gear assembly and the gear-worm gear assembly. In the technical solution of this application, the meshing clearance between the gear-worm gear assembly and the worm wheel can be automatically and adaptively adjusted by the first elastic element, so that the gear-worm gear assembly and the worm wheel always maintain a suitable meshing clearance, thereby improving the transmission efficiency of the geared motor and reducing the operating noise of the geared motor. In this way, the geared motor using this gearbox can always maintain high transmission efficiency and low operating noise. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of an electric pedal provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a geared motor provided in some embodiments of this application from one viewpoint; Figure 4 This is a schematic diagram of the geared motor provided in some embodiments of this application from another perspective; Figure 5 yes Figure 4 A cross-sectional view of the geared motor at point AA; Figure 6 This is a structural schematic diagram of the geared motor provided in some embodiments of this application from another perspective; Figure 7This is an exploded view of a geared motor provided in some embodiments of this application; Figure 8 This is a cross-sectional view of a gearbox provided in some embodiments of this application; Figure 9 This is a schematic diagram of the structure of the first elastic member provided in some embodiments of this application from one viewpoint; Figure 10 This is a schematic diagram of the structure of the first elastic member provided in some embodiments of this application from another perspective; Figure 11 This is a schematic diagram of the structure of the first support sleeve provided in some embodiments of this application; Figure 12 This is a schematic diagram of the structure of the box provided in some embodiments of this application from one viewpoint; Figure 13 This is a schematic structural view of the box provided in some embodiments of this application from another perspective; Figure 14 This is a schematic diagram of the structure of the second elastic element provided in some embodiments of this application; Figure 15 This is a schematic diagram of the structure of the second support sleeve provided in some embodiments of this application; Figure 16 These are schematic diagrams of the worm gear structure provided in some embodiments of this application; Figure 17 This is a schematic diagram of the structure of a non-metallic gear body provided in some embodiments of this application; Figure 18 This is a schematic diagram of the structure of a metal insert provided in some embodiments of this application.

[0018] Explanation of reference numerals in the attached drawings: 10000 - Vehicle, 1000 - Electric pedal, 100 - Gear motor, 110 - Gearbox, 111 - First worm gear, 112 - Gear and worm gear assembly, 1121 - Gear, 1122 - Second worm gear, 1123 - Operating hole, 113 - Worm wheel, 1131 - Non-metallic gear body, 1131a - Internal spline, 1131b - Ring key, 1131c - External gear, 1132 - Metal 1132a - External spline, 1132b - Ring groove, 114 - First elastic element, 1141 - Second snap-fit ​​structure, 1142 - Second limiting structure, 115 - First support sleeve, 1151 - First base plate, 1151a - First snap-fit ​​structure, 1152 - First peripheral wall, 116 - Box body, 1161 - First cavity, 1161a - First limiting structure, 1161b - First opening, 116 1c - First fixing position, 1161d - Second fixing position, 1162 - Second cavity, 1162a - Third opening, 1162b - Third limiting structure, 1162c - First receiving groove, 1162d - Second receiving groove, 1162e - Third receiving groove, 1163 - Third cavity, 1163a - Second opening, 1163b - Third fixing position, 117 - Second elastic element, 1171 - Fourth limiting structure. 1172-Fourth snap-fit ​​structure, 118-Second support sleeve, 1181-Second base plate, 1182-Second peripheral wall, 1183-Third snap-fit ​​structure, 1191-Fastener, 1192-End cap, 1192a-Stepped hole, 1193-Oil baffle, 1194-Output shaft, 1195-Bearing, 1196-Elastic washer, 120-Motor, 121-Armature shaft, 122-Housing, 123-Magnetic tile. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] In this application, the first direction, the second direction, and the third direction are mutually perpendicular. The first direction refers to the direction along the X-axis, the second direction refers to the direction along the Y-axis, and the third direction refers to the direction along the Z-axis.

[0023] The gearbox provided in this application includes: a housing comprising a first cavity, a second cavity, and a third cavity that are connected in communication; a first worm gear housed in the second cavity, the first worm gear being used for transmission connection with the output end of a motor; a gear-worm gear assembly housed in the first cavity, along the length direction of the gear-worm gear assembly, the gear-worm gear assembly having a connected gear and a second worm gear in sequence, the gear meshing with the first worm gear; a worm wheel housed in the third cavity, the worm wheel meshing with the second worm gear, the worm wheel being used for transmission connection with an output shaft; and a first elastic element housed in the first cavity, the first elastic element abutting between the inner wall of the first cavity and the gear-worm gear assembly. In the technical solution of this application, the meshing clearance between the gear-worm gear assembly and the worm wheel can be automatically and adaptively adjusted by the first elastic element, so that the gear-worm gear assembly and the worm wheel always maintain a suitable meshing clearance, thereby improving the transmission efficiency of the geared motor and reducing the operating noise of the geared motor. In this way, the geared motor can always maintain high transmission efficiency and low operating noise.

[0024] Please see Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle provided in some embodiments of this application. The vehicle 10000 provided in this application may include, but is not limited to, an electric running board 1000. The electric running board 1000 is used to automatically extend to assist occupants in conveniently entering and exiting the vehicle cabin, and to automatically retract to ensure the passability and aesthetic appearance of the vehicle 10000. In some embodiments, opening the door of the vehicle 10000 can trigger the electric running board 10000 to automatically extend, and closing the door of the vehicle 10000 can trigger the electric running board 10000 to automatically retract. Compared with the prior art, the electric running board 10000 has good layout performance, which is beneficial for its placement in the chassis of the vehicle 10000. When the electric running board 10000 is in the retracted position, the vehicle 10000 still has a large ground clearance, thereby ensuring the passability and off-road performance of the vehicle 10000.

[0025] Please see Figure 2 , Figure 2This is a schematic diagram of the structure of an electric pedal provided in some embodiments of this application. The electric pedal 1000 provided in this application may include, but is not limited to, a geared motor 100. Driven by the geared motor 100, the electric pedal 1000 can automatically extend and / or automatically retract relative to the vehicle body 10000. In some embodiments, the geared motor 100 has a self-locking function, so that the electric pedal 1000 will not automatically extend when it is in the retracted position, thereby ensuring the driving safety of the vehicle 10000. Compared with the prior art, the geared motor 100, while ensuring sufficient output torque and output power, has the advantages of compact structure and small size, which is conducive to its arrangement in the chassis of the vehicle 10000, thus making the electric pedal 1000 equipped with the geared motor 100 easier to arrange in the chassis of the vehicle 10000. Due to the advantages of compact structure and small size of the geared motor 100, when the electric pedal 1000 is in the retracted position, the vehicle 10000 still has a large ground clearance, thereby ensuring the passability and off-road performance of the vehicle 10000.

[0026] Please refer to the following: Figures 3-7 , Figure 3 This is a schematic diagram of the structure of a geared motor provided in some embodiments of this application from one view. Figure 4 This is a schematic diagram of the geared motor provided in some embodiments of this application from another perspective. Figure 5 yes Figure 4 A cross-sectional view of the geared motor at point AA. Figure 6 This is a structural schematic diagram of the geared motor provided in some embodiments of this application from another perspective. Figure 7 This is an exploded view of a geared motor provided in some embodiments of this application. The geared motor 100 provided in this application may include, but is not limited to, a motor 120 and a gearbox 110. The motor 120 includes an armature shaft 121. The gearbox 110 includes a first worm gear 111. The armature shaft 121 of the motor 120 is drive-connected to the first worm gear 111 of the gearbox 110 to transmit the torque output by the motor 120 to the gearbox 110 via the armature shaft 121. In some embodiments, the armature shaft 121 passes through the first worm gear 111 and is interference-fitted with the first worm gear 111. Compared with the prior art, the gearbox 110 optimizes the layout of the internal transmission components, making the structure of the gearbox 110 more compact and smaller in size, thereby giving the geared motor 100 using the gearbox 110 the advantages of compact structure and small size.

[0027] In this embodiment, the motor 120 also includes a housing 122 and four magnetic tiles 123. The four magnetic tiles 123 are fixed to the inner wall of the housing 122. This provides a stable magnetomotive force source for the motor 120, simplifies the structure of the motor 120, reduces its size, and makes it easier to arrange within the confined space of the vehicle chassis 10000. The length of the housing 122 along the first direction is greater than or equal to 70 mm and less than or equal to 80 mm. Specifically, the length of the housing 122 along the first direction can be 70 mm, 71 mm, 72 mm, 72.6 mm, 73 mm, 73.2 mm, 73.8 mm, 74.1 mm, 74.5 mm, 75 mm, 76 mm, 76.3 mm, 76.7 mm, 78 mm, 78.4 mm, 79 mm, 79.5 mm, or 80 mm, etc. In this embodiment, the length of the housing 122 along the first direction is approximately 74.4 mm.

[0028] The diameter of the housing 122 is greater than or equal to 48 mm and less than or equal to 56 mm. Specifically, the diameter of the housing 122 can be 48 mm, 48.5 mm, 49 mm, 49.6 mm, 50 mm, 50.6 mm, 51.2 mm, 51.6 mm, 52 mm, 52.3 mm, 52.7 mm, 53 mm, 53.6 mm, 54 mm, 54.2 mm, 54.6 mm, 55 mm, 55.4 mm, 55.8 mm, or 56 mm, etc. In this embodiment, the diameter of the housing 122 is approximately 52.2 mm.

[0029] In this embodiment, the length L4 of the geared motor 100 along the first direction is greater than or equal to 250 mm and less than or equal to 260 mm. Specifically, the length L4 of the geared motor 100 along the first direction can be 250 mm, 250.5 mm, 251 mm, 251.3 mm, 251.6 mm, 252 mm, 252.6 mm, 252.8 mm, 253.2 mm, 253.7 mm, 254 mm, 254.3 mm, 254.5 mm, 255 mm, 256 mm, 256.7 mm, 258.1 mm, 258.8 mm, 259 mm, or 260 mm, etc. In this embodiment, the length L4 of the geared motor 100 along the first direction is approximately 254.87 mm.

[0030] The width of the geared motor 100 along the second direction is greater than or equal to 90 mm and less than or equal to 100 mm. Specifically, the width L5 of the geared motor 100 along the second direction can be 90 mm, 90.5 mm, 91 mm, 91.3 mm, 91.6 mm, 92 mm, 92.6 mm, 92.8 mm, 93.2 mm, 93.7 mm, 94 mm, 94.3 mm, 94.5 mm, 95 mm, 96 mm, 96.7 mm, 98.1 mm, 98.8 mm, 99 mm, or 100 mm, etc. In this embodiment, the width L5 of the geared motor 100 along the second direction is approximately 95 mm.

[0031] In this embodiment, the height L6 of the geared motor 100 along the third direction is greater than or equal to 75mm and less than or equal to 85mm. Specifically, the height L6 of the geared motor 100 along the third direction can be 75mm, 75.5mm, 76mm, 76.3mm, 76.6mm, 77mm, 77.6mm, 77.8mm, 78.2mm, 78.7mm, 79mm, 79.3mm, 79.5mm, 80mm, 81mm, 81.7mm, 82.1mm, 83.8mm, 84mm, or 85mm, etc. In this embodiment, the height L6 of the geared motor 100 along the third direction is approximately 79.2mm.

[0032] Please refer to the following: Figures 3-15 , Figure 8 This is a cross-sectional view of a gearbox provided in some embodiments of this application. Figure 9 This is a schematic diagram of the structure of the first elastic member provided in some embodiments of this application from one viewpoint. Figure 10 This is a schematic diagram of the structure of the first elastic member provided in some embodiments of this application from another perspective. Figure 11 This is a schematic diagram of the structure of the first support sleeve provided in some embodiments of this application. Figure 12 This is a schematic diagram of the structure of the box provided in some embodiments of this application from one perspective. Figure 13 This is a schematic structural view of the box provided in some embodiments of this application from another perspective. Figure 14 This is a schematic diagram of the structure of the second elastic member provided in some embodiments of this application. Figure 15This is a schematic diagram of the structure of the second support sleeve provided in some embodiments of this application. The reduction gearbox 110 provided in this application may include, but is not limited to, a first worm 111, a gear worm component 112, a worm wheel 113, and a housing 116. The first worm 111 is used for transmission connection with the output end of the motor 120. Specifically, the first worm 111 is transmission connected to the armature shaft 121 of the motor 120. Along the length direction of the gear worm component 112, the gear worm component 112 is provided with a connected gear 1121 and a second worm 1122 in sequence. The gear 1121 meshes with the first worm 111 to realize the first-stage reduction transmission connection and increase the output torque. The worm wheel 113 meshes with the second worm 1122 to realize the second-stage reduction transmission connection and further increase the output torque. The worm wheel 113 is used for transmission connection with the output shaft 1194. The length direction of the first worm 111 and the width direction of the worm wheel 113 are both parallel to the first direction. The length direction of the gear worm component 112 is parallel to the second direction. In the third direction, the first worm 111 and the worm wheel 113 are located on the same side of the gear and worm component 112 to optimize the layout of each transmission component in the gearbox 110, thereby reducing the volume of the gearbox 110 and making it easier to install the geared motor 100 using the gearbox 110 on the chassis of the vehicle 10000.

[0033] Further, the housing 116 includes a first cavity 1161, a second cavity 1162, and a third cavity 1163 connected together. A gear and worm gear member 112 is housed in the first cavity 1161. A first worm 111 is housed in the second cavity 1162. A worm wheel 113 is housed in the third cavity 1163. The second cavity 1162 communicates with the first cavity 1161, allowing the first worm 111 to mesh with the gear 1121. The third cavity 1163 communicates with the first cavity 1161, allowing the worm wheel 113 to mesh with the second worm 1122. Specifically, the first worm 111 meshes with the gear 1121 at the connection between the second cavity 1162 and the first cavity 1161, and the worm wheel 113 meshes with the second worm 1122 at the connection between the third cavity 1163 and the first cavity 1161.

[0034] In this embodiment, the length L1 of the gearbox 110 along the first direction is greater than or equal to 55 mm and less than or equal to 65 mm. Specifically, the length L1 of the gearbox 110 along the first direction can be 55 mm, 55.5 mm, 56 mm, 56.3 mm, 56.6 mm, 57 mm, 57.6 mm, 57.8 mm, 58.2 mm, 58.7 mm, 59 mm, 59.3 mm, 59.5 mm, 60 mm, 61 mm, 61.7 mm, 62.1 mm, 63.8 mm, 64 mm, or 65 mm, etc. In this embodiment, the length L1 of the gearbox 110 along the first direction is approximately 60.8 mm.

[0035] In this embodiment, the width L2 of the gearbox 110 along the second direction is greater than or equal to 90 mm and less than or equal to 100 mm. Specifically, the width L2 of the gearbox 110 along the second direction can be 90 mm, 90.5 mm, 97 mm, 97.3 mm, 97.6 mm, 92 mm, 92.6 mm, 92.8 mm, 93.2 mm, 93.7 mm, 94 mm, 94.3 mm, 94.5 mm, 95 mm, 96 mm, 96.7 mm, 97.1 mm, 98.8 mm, 99 mm, or 100 mm, etc. In this embodiment, the width L2 of the gearbox 110 along the second direction is approximately 95 mm.

[0036] The height L3 of the gearbox 110 along the third direction is greater than or equal to 75mm and less than or equal to 85mm. Specifically, the height L3 of the geared motor 100 along the third direction can be 75mm, 75.5mm, 76mm, 76.3mm, 76.6mm, 77mm, 77.6mm, 77.8mm, 78.2mm, 78.7mm, 79mm, 79.3mm, 79.5mm, 80mm, 81mm, 81.7mm, 82.1mm, 83.8mm, 84mm, or 85mm, etc. In this embodiment, the height L3 of the geared motor 100 along the third direction is approximately 79.2mm.

[0037] In this embodiment, the motor 120 outputs torque to the first worm 111 via the armature shaft 121. The first worm 111 drives the gear 1121 to complete the first stage of reduction. The gear 1121 and the second worm 1122 rotate synchronously, and the second worm 1122 then drives the worm wheel 113 to complete the second stage of reduction. Through two stages of reduction, the high-speed, low-torque output by the motor 120 via the armature shaft 121 can be converted into a low-speed, high-torque suitable for driving the electric pedal 1000. The worm wheel 113 rotates synchronously with the output shaft 1194, which can drive the foot pedal in the electric pedal 1000 to extend or retract smoothly. The gear 1121 can be a helical gear. The meshing transmission between the first worm 111 and the gear 1121 may not have self-locking performance, while the meshing transmission between the second worm 1122 and the worm wheel 113 can have self-locking performance, thus enabling the reduction gearbox 110 to have both high transmission efficiency and excellent self-locking performance.

[0038] Furthermore, the gearbox 110 also includes a first elastic element 114. The end of the gear worm 112 abuts against the first elastic element 114 to automatically adjust the meshing clearance between the gear worm 112 and the worm wheel 113, and / or the meshing clearance between the gear worm 112 and the first worm 111. It is understood that after prolonged use of the geared motor 100, the meshing clearance between the second worm 1122 and the worm wheel 113 and / or the meshing clearance between the first worm 111 and the gear 1121 will increase due to wear. At this time, the first elastic element 114 provides a reverse thrust or pull force through its own elastic deformation, causing the meshing clearance to return to a normal state, thereby avoiding problems such as reduced transmission efficiency and abnormal noise caused by excessive clearance. Simultaneously, by providing the first elastic element 114, this embodiment eliminates the need for manual adjustment or the addition of additional shims to adjust the meshing clearance, simplifying the assembly and maintenance process.

[0039] Furthermore, the gearbox 110 also includes a first support sleeve 115. The first support sleeve 115 is fitted onto the end of the gear and worm gear 112 to replace the bearing, thereby saving costs. The first support sleeve 115 includes a first base plate 1151 and a first peripheral wall 1152. The first peripheral wall 1152 extends from the edge of the first base plate 1151. The first base plate 115 acts as a wear-resistant plate. The end of the gear and worm gear 112 passes through the first peripheral wall 1152 and abuts against the first base plate 1151. The first base plate 1151 has a first snap-fit ​​structure 1151a on the side opposite to the first peripheral wall 1152. The first elastic member 114 has a second snap-fit ​​structure 1141. The first snap-fit ​​structure 1151a and the second snap-fit ​​structure 1141 snap together, so that the first support sleeve 115 and the first elastic member 114 snap together for easy assembly. In this way, the axial elastic force of the first elastic element 114 can be continuously applied to the meshing point between the second worm 1122 and the worm wheel 113, and / or the meshing point between the first worm 111 and the gear 1121, thereby automatically maintaining the meshing clearance between the second worm 1122 and the worm wheel 113 and / or the meshing clearance between the first worm 111 and the gear 1121. At the same time, it prevents the first elastic element 114 from shifting or detaching from the gear and worm assembly 112 in a vibrating environment.

[0040] Optionally, the first support sleeve 115 is made of engineering plastic. Engineering plastic support sleeves have the advantages of high strength, low cost, light weight, and self-lubrication.

[0041] Furthermore, the first cavity 1161 has a first limiting structure 1161a on its inner wall abutting against the first elastic member 114. The end of the first elastic member 114 away from the first support sleeve 115 has a second limiting structure 1142. The first limiting structure 1161a and the second limiting structure 1142 are connected to limit the rotation of the first elastic member 114 relative to the first cavity 1161.

[0042] Furthermore, the gearbox 110 includes a second elastic element 117. The second elastic element 117 is capable of withstanding the axial force transmitted by the first worm gear 111. Specifically, the second elastic element 117 is housed in the second cavity 1162. The second elastic element 117 abuts against the inner wall of the armature shaft 121 and the second cavity 1162. The first worm gear 111 is sleeved on the armature shaft 121. When the meshing clearance between the first worm gear 111 and the gear 1121 increases due to long-term wear, the second elastic element 117 automatically adjusts the clearance through elastic deformation. At the same time, the second elastic element 117 and the first elastic element 114 work together to further reduce the noise of the geared motor 100. For example, during the start-up and stop of the geared motor 100, the armature shaft 121 is often subjected to a large axial force. The second elastic element 117 plays a role in buffering and absorbing energy at this time, thereby preventing abnormal noise from the geared motor 100 during start-up and stop.

[0043] Furthermore, the second cavity 1162 includes a first receiving groove 1162c, a second receiving groove 1162d, and a third receiving groove 1162e that are in communication with each other. A second elastic member 117 is received in the first receiving groove 1162c. A first worm gear 111 is received in the second receiving groove 1162d. A bearing 1195 and an elastic washer 1196 are received in the third receiving groove 1162e.

[0044] Furthermore, the gearbox 110 includes a second support sleeve 118. The second support sleeve 118 includes a second base plate 1181 and a second peripheral wall 1182 extending from the edge of the second base plate 1181. The second base plate 1181 acts as a wear-resistant plate. A third snap-fit ​​structure 1183 is provided on the side of the second base plate 1181 opposite to the second peripheral wall 1182. The second elastic member 117 is provided with a fourth snap-fit ​​structure 1172. The third snap-fit ​​structure 1183 and the fourth snap-fit ​​structure 1172 snap-fit ​​together, so that the second support sleeve 118 and the second elastic member 117 snap-fit ​​together for easy assembly. In this way, the axial elastic force of the second elastic member 117 can be continuously applied to the meshing point between the first worm 111 and the gear 1121, thereby automatically adapting and adjusting the meshing clearance between the first worm 111 and the gear 1121. At the same time, it prevents the second elastic member 117 from shifting or falling off the first worm 111 in a vibration environment.

[0045] Furthermore, the second cavity 1162 has a third limiting structure 1162b on its inner wall abutting against the second elastic member 117. The end of the second elastic member 117 facing away from the second support sleeve 118 has a fourth limiting structure 1171. The third limiting structure 1162b and the fourth limiting structure 1171 are connected to limit the rotation of the second elastic member 117 relative to the second cavity 1162. Furthermore, the gearbox 110 also includes a bearing 1195 and an elastic washer 1196. The bearing 1195 is housed in the second cavity 1162 and located between the first worm gear 111 and the motor 120. The output end of the motor 120 passes through the bearing 1195 and provides axial positioning for the bearing 1195. The elastic washer 1196 is disposed in the second cavity 1162 and located between the bearing 1195 and the first worm gear 111. The elastic washer 1196 abuts against the inner wall of the second cavity 1162 and the bearing 1195 to buffer and absorb the axial force applied to the armature shaft 121 to the bearing 1195 when the geared motor 100 starts and stops, thereby preventing abnormal noise from the geared motor 100 when it starts and stops.

[0046] Furthermore, the first cavity 1161 has a first opening 1161b at the end near the gear 1121. The gearbox 110 includes a fastener 1191. The gear worm gear 112 has an operating hole 1123 at the end near the gear 1121. The fastener 1191 is screwed to the first cavity 1161 to cover the first opening 1161b, preventing dust, liquids, etc. from entering the inside of the housing 116 through the first opening 1161b. At the same time, the gear worm gear 112 can be assembled and disassembled through the operating hole 1123. When maintaining the geared motor 100, it is only necessary to open the fastener 1191 and pre-tighten or remove the gear worm gear 112 through the operating hole 1123, without disassembling the entire housing 116, so as to facilitate the inspection and maintenance of the geared motor 100. In addition, when the electric pedal 1000 malfunctions and cannot retract automatically, the foot pedal in the electric pedal 1000 can be manually driven from the extended position to the retracted position through the operation hole 1123 in the geared motor 100.

[0047] Furthermore, the third cavity 1163 is provided with a second opening 1163a. ​​The gearbox 110 includes an end cover 1192, an oil baffle 1193, and an output shaft 1194. The end cover 1192 is fixed to the third cavity 1163 to cover the second opening 1163a. ​​The end cover 1192 is provided with a stepped hole 1192a. The stepped hole 1192a communicates with the third cavity 1163. The oil baffle 1193 is provided in the larger hole of the stepped hole 1192a to prevent lubricating oil leakage. The output shaft 1194 passes through the stepped hole 1192a and is interference-fitted with the worm gear 113 to ensure that the torque output by the motor 120 can be stably transmitted from the worm gear 113 to the output shaft 1194.

[0048] Furthermore, the second cavity 1162 is provided with a third opening 1162a. The motor 120 is fixed to the second cavity 1162 to block the third opening 1162a.

[0049] Furthermore, the housing 116 includes three fixing positions. The lines connecting the three fixing positions form a triangle. Specifically, the first cavity 1161 is provided with a first fixing position 1161c and a second fixing position 1161d. The third cavity 1163 is provided with a third fixing position 1163b. The lines connecting the first fixing position 1161c, the second fixing position 1161d, and the third fixing position 1163b form a triangle. For example, when the geared motor 100 is arranged on the chassis of the vehicle 10000 and used to drive the electric pedal 1000, it is fixedly connected to the mounting seat of the electric pedal 1000 through the first fixing position 1161c, the second fixing position 1161d, and the third fixing position 1163b, so that the gearbox 110 and the electric pedal 1000 form a three-point support, ensuring connection stability and uniform force distribution. In this embodiment, the gearbox 110 or the geared motor 100 has a compact structure, so that the center of the gearbox 110 or the geared motor 100 is located in the triangle, and the distance between the center of gravity and the three fixed positions is relatively uniform, so that the connection between the geared motor 100 and the mounting base of the electric pedal 1000 is subjected to uniform force and has high connection strength.

[0050] The distance between the first fixing position 1161c and the second fixing position 1161d is greater than or equal to 80mm and less than or equal to 88mm. Specifically, the distance between the first fixing position 1161c and the second fixing position 1161d can be 80mm, 80.5mm, 81mm, 81.3mm, 81.6mm, 82mm, 82.6mm, 83.8mm, 84.2mm, 85.7mm, 86mm, 86.3mm, 86.5mm, 87mm, 87.4mm, 87.7mm, or 88mm, etc. In this embodiment, the distance between the first fixing position 1161c and the second fixing position 1161d is approximately 83.65mm.

[0051] The distance between the first fixing position 1161c and the third fixing position 1163b is greater than or equal to 60mm and less than or equal to 70mm. Specifically, the distance between the first fixing position 1161c and the third fixing position 1163b can be 60mm, 60.5mm, 67mm, 67.3mm, 67.6mm, 62mm, 62.6mm, 62.8mm, 63.2mm, 63.7mm, 64mm, 64.3mm, 64.5mm, 65mm, 66mm, 66.7mm, 67.1mm, 68.8mm, 69mm, or 70mm, etc. In this embodiment, the distance between the first fixing position 1161c and the third fixing position 1163b is 65.74mm.

[0052] The distance between the second fixing position 1161d and the third fixing position 1163b is greater than or equal to 75mm and less than or equal to 85mm. Specifically, the distance between the second fixing position 1161d and the third fixing position 1163b can be 75mm, 75.5mm, 76mm, 76.3mm, 76.6mm, 77mm, 77.6mm, 77.8mm, 78.2mm, 78.7mm, 79mm, 79.3mm, 79.5mm, 80mm, 81mm, 81.7mm, 82.1mm, 83.8mm, 84mm, or 85mm, etc. In this embodiment, the distance between the second fixing position 1161d and the third fixing position 1163b is approximately 80.19mm.

[0053] Please refer to the following: Figures 16-18 , Figure 16 This is a schematic diagram of the worm gear structure provided in some embodiments of this application. Figure 17 This is a schematic diagram of the structure of a non-metallic gear body provided in some embodiments of this application. Figure 18This is a schematic diagram of the structure of a metal insert provided in some embodiments of this application. The worm gear 113 provided in this application may include, but is not limited to, a non-metallic gear body 1131 and a metal insert 1132. The metal insert 1132 is embedded in the inner circumferential surface of the non-metallic gear body 1131. The ratio of the radial thickness of the non-metallic gear body 1131 to the radial thickness of the metal insert 1132 ranges from 0.45:1 to 1:0.45. By selecting a suitable thickness ratio, the worm gear 113 can achieve good strength performance, excellent noise reduction performance, and low manufacturing cost. Specifically, the ratio of the radial thickness of the non-metallic gear body 1131 to the radial thickness of the metal insert 1132 can be 0.45:1, 0.5:1, 0.6:1, 0.7:1, 0.75:1, 0.9:1, 1:1, 1:0.9, 1:0.75, 1:0.7, 1:0.6, 1:0.5, or 1:0.45, etc. In this embodiment, the ratio of the radial thickness of the non-metallic gear body 1131 to the radial thickness of the metal insert 1132 is 1:1.

[0054] Furthermore, the non-metallic gear body 1131 is made of plastic or composite material. The non-metallic gear body 1131 is injection molded onto the metal insert 1132 to enhance the connection strength with the metal insert 1132.

[0055] The plastic includes at least one of nylon and polyetheretherketone (PEEK). Specifically, the plastic can be nylon, PEEK, or a mixture of nylon and PEEK.

[0056] The composite material includes at least two of nylon, polyetheretherketone (PEEK), and carbon fiber. Specifically, the composite material may be composed of nylon and PEEK, or nylon and carbon fiber, or PEEK and carbon fiber, or all three of nylon, PEEK, and carbon fiber.

[0057] In this embodiment, the non-metallic gear body 1131 can be injection molded into the metal insert 1132 in one step, which simplifies the processing of the turbine 113 and reduces manufacturing costs.

[0058] In some other embodiments, the non-metallic gear body 1131 may include a nylon matrix and a polyetheretherketone (PEEK) layer disposed on the nylon matrix. The nylon matrix is ​​used to absorb vibrations to reduce transmission noise; the PEEK layer is used to enhance the strength and wear resistance of the non-metallic gear body.

[0059] In some other embodiments, the non-metallic gear body 1131 may include a nylon matrix, a polyetheretherketone (PEEK) layer layered on the nylon matrix, and a carbon fiber layer layered on the PEEK layer. The nylon matrix is ​​used to absorb vibration and reduce transmission noise; the PEEK layer is used to enhance the strength and wear resistance of the non-metallic gear body; and the carbon fiber layer is used to further enhance the strength of the non-metallic gear body.

[0060] Polyetheretherketone (PEEK) possesses excellent wear resistance, high-temperature resistance, and chemical stability, enabling it to operate stably for extended periods in harsh environments. It also exhibits a low coefficient of friction and good mechanical rigidity, allowing the non-metallic gear body 110 to withstand high-speed and high-load operating conditions.

[0061] Nylon has advantages such as low density, light weight, and shock absorption performance. At least one of PA66, PA6T, PA9T, and PA46 can be selected as the nylon. In this embodiment, PA66 is selected.

[0062] Furthermore, the radial thickness of the non-metallic gear body 1131 is greater than or equal to 4 mm and less than or equal to 9 mm. Given the limited radial dimensions of the worm gear 113, selecting a suitable radial thickness for the non-metallic gear body 1131 can achieve the desired noise reduction effect. Specifically, the radial thickness of the non-metallic gear body 1131 can be 4 mm, 4.3 mm, 4.5 mm, 4.7 mm, 5.1 mm, 5.3 mm, 5.5 mm, 6.4 mm, 7.1 mm, 7.6 mm, 8.2 mm, 8.8 mm, or 9 mm, etc. In this embodiment, the thickness of the non-metallic gear body 1131 is approximately 7 mm.

[0063] Furthermore, the radial thickness of the metal insert 1132 is greater than or equal to 4 mm and less than or equal to 9 mm. Given the limited radial dimensions of the worm gear 113, selecting a metal insert 1132 with a suitable radial thickness can achieve the desired strength and manufacturing cost. Specifically, the radial thickness of the metal insert 1132 can be 4 mm, 4.3 mm, 4.5 mm, 4.7 mm, 5.1 mm, 5.3 mm, 5.5 mm, 6.4 mm, 7.1 mm, 7.6 mm, 8.2 mm, 8.8 mm, or 9 mm, etc. In this embodiment, the thickness of the metal insert 1132 is approximately 6 mm.

[0064] Furthermore, the inner circumferential surface of the non-metallic gear body 1131 is provided with an internal spline 111. The outer circumferential surface of the metal insert 1132 is provided with an external spline 1132a. The external spline 1132a meshes with the internal spline 1131a. In this way, the contact area between the non-metallic gear body 1131 and the metal insert 1132 can be increased, stress can be dispersed, thereby enhancing the torsional strength of the non-metallic gear body 1131 and the connection strength between the metal insert 1132 and the non-metallic gear body 1131.

[0065] Furthermore, the inner circumferential surface of the non-metallic gear body 1131 is also provided with a ring key 1131b. The metal insert 1132 is provided with a ring groove 1132b, and the ring key 1131b is bonded to the ring groove 1132b to enhance the axial pull-out force between the non-metallic gear body 1131 and the metal insert 1132.

[0066] Furthermore, the non-metallic gear body 1131 includes an external tooth portion 1131c. The external tooth portion 1131c is evenly distributed along the outer circumferential surface of the non-metallic gear body 1131. The external tooth portion 1131c is provided with a throat circle 1 to avoid transmission interference between the worm gear 113 and the second worm 1122. The diameter of the throat circle is greater than or equal to 10 mm and less than or equal to 14 mm. A throat circle of a suitable diameter can increase the contact area between the non-metallic gear body 1131 and the second worm 1122, thereby improving the load capacity of the external tooth portion 1131c of the non-metallic gear body 1131 and the pitting corrosion resistance of the non-metallic gear body 1131 under high load conditions. Specifically, the diameter of the throat circle can be 10mm, 10.3mm, 10.8mm, 11.2mm, 11.5mm, 11.9mm, 12.2mm, 12.5mm, 12.7mm, 13mm, 13.4mm, 13.7mm or 14mm, etc.

[0067] In this embodiment, the diameter of the throat circle is approximately 12 mm.

[0068] In some other embodiments, the geared motor 100 includes a motor 120 and a gearbox 110. The motor 120 includes a housing 122, an armature shaft 121, and two magnets 123 fixed to the inner wall of the housing 122. The gearbox 110 includes a housing 116, a first worm gear 111, a gear and worm assembly 112, a worm wheel 113, a second elastic element 117, a bearing 1195, and an elastic washer 1196. The housing 116 includes a first cavity 1161, a second cavity 1162, and a third cavity 1163 that communicate with each other. The first worm gear 111 is housed in the second cavity 1162. The first worm gear 111 is used for a drive connection with the output end of the motor 120. Specifically, the armature shaft 121 is drive-connected to the first worm gear 111 of the gearbox 110. The gear and worm assembly 112 is housed in the first cavity 1161. Along the length of the gear and worm gear assembly 112, the gear and worm gear assembly 112 is sequentially provided with a connected gear 1121 and a second worm 1122. The gear 1121 meshes with the first worm 111. A worm wheel 113 is housed in a third cavity 1163. The worm wheel 113 meshes with the second worm 1122. The worm wheel 113 is used for transmission connection with the output shaft 1194. A second elastic element 117 is housed in the second cavity 1162. The second elastic element 117 can withstand the axial force transmitted by the first worm 111. A bearing 1195 is housed in the second cavity 1162 and is located between the first worm 111 and the motor 120. The output end of the motor 120 passes through the bearing 1195 and provides axial positioning for the bearing 1195. An elastic washer 1196 is disposed in the second cavity 1162 and is located between the bearing 1195 and the first worm 111. An elastic washer 1196 abuts against the inner wall of the second cavity 1162 and the bearing 1195. The length direction of the first worm 111 and the width direction of the worm wheel 113 are both parallel to the first direction. The length direction of the gear worm assembly 112 is parallel to the second direction. In the third direction, the first worm 111 is located on one side of the gear worm assembly 112, and the worm wheel 113 is located on the other side of the gear worm assembly 112. The first direction, the second direction, and the third direction are all perpendicular to each other.

[0069] In some other embodiments, the geared motor 100 includes a motor 120 and a gearbox 110. The motor 120 includes a housing 122, an armature shaft 121, and two magnets 123 fixed to the inner wall of the housing 122. The gearbox 110 includes a housing 116, a first worm 111, a gear and worm assembly 112, a worm wheel 113, and a first elastic element 114. The housing 116 includes a first cavity 1161, a second cavity 1162, and a third cavity 1163 that communicate with each other. The first worm 111 is housed in the second cavity 1162. The first worm 111 is used for a drive connection with the output end of the motor 120. Specifically, the armature shaft 121 is drive-connected to the first worm 111 of the gearbox 110. The gear and worm assembly 112 is housed in the first cavity 1161. Along the length of the gear and worm assembly 112, the gear and worm assembly 112 is sequentially provided with a connected gear 1121 and a second worm 1122. Gear 1121 meshes with the first worm 111. Worm wheel 113 is housed in the third cavity 1163. Worm wheel 113 meshes with the second worm 1122. Worm wheel 113 is used for transmission connection with the output shaft 1194. First elastic element 114 is housed in the first cavity 1161. The first elastic element 114 abuts against the inner wall of the first cavity 1161 and between the gear and worm 112. The length direction of the first worm 111 and the width direction of the worm wheel 113 are both parallel to a first direction. The length direction of the gear and worm 112 is parallel to a second direction. In the third direction, the first worm 111 is located on one side of the gear and worm 112, and the worm wheel 113 is located on the other side of the gear and worm 112. The first, second, and third directions are mutually perpendicular.

[0070] The gearbox 110 provided in this application includes: a housing 116, including a first cavity 1161, a second cavity 1162, and a third cavity 1163 that are connected to each other; a first worm 111, which is housed in the second cavity 1162 and is used for transmission connection with the output end of the motor 120; a gear and worm assembly 112, which is housed in the first cavity 1161 and, along the length direction of the gear and worm assembly 112, is provided with a connected gear 1121 and a second worm 1122, the gear 1121 meshing with the first worm 111; a worm wheel 113, which is housed in the third cavity 1163 and meshes with the second worm 1122, the worm wheel 113 being used for transmission connection with the output shaft 1194; and a first elastic member 114, which is housed in the first cavity 1161 and abuts against the inner wall of the first cavity 1161 and the gear and worm assembly 112. In the technical solution of this application, the meshing clearance between the gear worm 112 and the worm wheel 113 can be automatically and adaptively adjusted by the first elastic element 114, so that the gear worm 112 and the worm wheel 113 always maintain a suitable meshing clearance, thereby improving the transmission efficiency of the geared motor 100 and reducing the operating noise of the geared motor 100. In this way, the geared motor 100 can always maintain high transmission efficiency and low operating noise.

[0071] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A gearbox, characterized in that, include: The enclosure includes a first cavity, a second cavity, and a third cavity that are connected to each other; A first worm gear is housed in the second cavity, and the first worm gear is used for transmission connection with the output end of the motor; A gear and worm gear assembly is housed in the first cavity. Along the length of the gear and worm gear assembly, the gear and worm gear assembly is provided with a connected gear and a second worm gear in sequence, and the gear meshes with the first worm gear. A worm gear is housed in the third cavity, the worm gear meshes with the second worm, and the worm gear is used for drive connection with the output shaft; A first elastic element is housed in the first cavity, and the first elastic element abuts against the inner wall of the first cavity and the gear and worm gear component.

2. The gearbox according to claim 1, characterized in that, The gearbox further includes a first support sleeve, which is sleeved on the end of the gear and worm gear. The first support sleeve includes a first base plate and a first peripheral wall extending from the edge of the first base plate. The end of the gear and worm gear passes through the first peripheral wall and abuts against the first base plate. The first base plate has a first snap-fit ​​structure on the side opposite to the first peripheral wall, and the first elastic member has a second snap-fit ​​structure. The first snap-fit ​​structure and the second snap-fit ​​structure snap-fit ​​together, so that the first support sleeve snaps into the first elastic member.

3. The gearbox according to claim 2, characterized in that, The first cavity has a first limiting structure at the inner wall that abuts against the first elastic member, and the first elastic member has a second limiting structure at the end away from the first support sleeve. The first limiting structure and the second limiting structure are connected to limit the rotation of the first elastic member relative to the first cavity.

4. The gearbox according to claim 1, characterized in that, The gearbox includes a second elastic element, which is housed in the second cavity. The second elastic element is used to adjust the meshing clearance between the first worm and the gear.

5. The gearbox according to claim 4, characterized in that, The gearbox includes a second support sleeve, which includes a second base plate and a second peripheral wall extending from the edge of the second base plate. The second base plate is provided with a third snap-fit ​​structure on the side opposite to the second peripheral wall, and the second elastic member is provided with a fourth snap-fit ​​structure. The third snap-fit ​​structure snaps into the fourth snap-fit ​​structure, so that the second support sleeve snaps into the second elastic member.

6. The gearbox according to claim 5, characterized in that, The second cavity has a third limiting structure at the inner wall that abuts against the second elastic member, and the second elastic member has a fourth limiting structure at the end away from the second support sleeve. The third limiting structure and the fourth limiting structure are connected to limit the rotation of the second elastic member relative to the second cavity.

7. The gearbox according to claim 1, characterized in that, The length direction of the first worm and the width direction of the worm wheel are both parallel to a first direction, and the length direction of the gear worm component is parallel to a second direction. In a third direction, the first worm and the worm wheel are located on the same side of the gear worm component; or, The length direction of the first worm and the width direction of the worm wheel are both parallel to the first direction, and the length direction of the gear worm is parallel to the second direction. In the third direction, the first worm is located on one side of the gear worm and the worm wheel is located on the other side of the gear worm. Wherein, the first direction, the second direction, and the third direction are perpendicular to each other.

8. A geared motor, characterized in that, The device includes a motor and a gearbox as described in any one of claims 1-7, wherein the motor includes an armature shaft that is connected to a first worm gear drive of the gearbox.

9. The geared motor according to claim 8, characterized in that, The motor includes a housing and two magnetic tiles fixed to the inner wall of the housing; or, the motor includes a housing and four magnetic tiles fixed to the inner wall of the housing.

10. The geared motor according to claim 8, characterized in that, The gearbox includes a second cavity and a second elastic element. The first worm and the second elastic element are both housed in the second cavity, and the second elastic element abuts against the armature shaft between the armature shaft and the inner wall of the second cavity.

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