Telescopic structure, fastening structure and watch

Abstract

The utility model discloses a telescopic structure, a fastening structure and a watch, and relates to the technical field of wearable products. The telescopic structure comprises a lead screw, a moving part, a telescopic part and a driving assembly, the lead screw is connected with the moving part in a matched mode, so that the moving part and the lead screw have good locking performance, adjustment of the relative position of the moving part on the lead screw has good adjustment precision, the driving assembly drives the lead screw to rotate, the moving part can move along the lead screw, and the telescopic part can move along the lead screw. The telescopic part is connected with the moving part, so that the telescopic part can move in the first direction along with movement of the moving part, then the length of the telescopic structure in the first direction is adjusted, and due to the fact that the telescopic part is driven by the moving part to move, the moving process of the telescopic part has the characteristics similar to the moving process of the moving part; and the telescopic part has good stability and adjustment precision in the moving process.

Description

Technical Field

[0001] The present application relates to the technical field of wearable products, and in particular to a telescopic structure, a fastening structure and a watch. Background Art

[0002] Wearable products include watches, glasses, helmets, belts, headphones and other products, which usually require an adjustable length fastening structure to achieve wearability and ensure tightness and comfort during wearing. However, the length adjustment of the fastening structure of current wearable products is restricted by its material. Fastening structures of different materials require different adjustment methods, resulting in poor applicability of the fastening structure. At the same time, the material of the fastening structure will also limit the minimum unit of length adjustment, resulting in poor adjustment accuracy of the fastening structure. When magnetic force or adhesive force is used to achieve a fixed fastening structure, although the adjustment accuracy of the fastening structure is improved, its fastening strength is reduced, and it cannot be guaranteed that the fastening structure has good adjustment accuracy and fastening strength at the same time. Utility Model Content

[0003] The present application provides a telescopic structure, a fastening structure and a watch. The telescopic structure includes a screw rod and a moving part that are connected in a cooperative manner. The driving assembly drives the screw rod to rotate, so that the moving part moves along the screw rod, and drives the telescopic part connected to the moving part to move along the first direction, thereby changing the length of the telescopic structure in the first direction. This is conducive to fully utilizing the adjustment accuracy and locking property of the screw rod structure, so that the telescopic structure has better accuracy and fastening during the length adjustment process.

[0004] In the first aspect, the present application provides a telescopic structure, comprising: a screw rod and a moving part, the screw rod and the moving part being cooperatively connected; a telescopic part and a driving assembly, the telescopic part and the moving part being connected, the driving assembly driving the screw rod to rotate so that the moving part moves along the screw rod, and the moving part drives the telescopic part to move along a first direction to adjust the length of the telescopic structure in the first direction.

[0005] The present application provides a telescopic structure, which includes a screw rod, a moving part, a telescopic portion and a drive assembly. The screw rod and the moving part are connected in a cooperative manner, so that there is good locking performance between the moving part and the screw rod, and the adjustment of the relative position of the moving part on the screw rod has good adjustment accuracy.

[0006] The drive assembly is used to drive the screw to rotate, so that the moving member can move along the screw. The telescopic part is connected to the moving member, so that the telescopic part can move along the first direction as the moving member moves, so as to adjust the length of the telescopic structure in the first direction. Since the telescopic part is driven by the moving member, the movement of the telescopic part is affected by the movement of the moving member along the screw. The moving member and the screw have good locking properties, so that the position of the telescopic part is fixed with good stability, which is conducive to ensuring the stability of the length of the telescopic structure after adjustment. The adjustment of the relative position of the moving member on the screw has good adjustment accuracy, so that the movement distance of the telescopic part in the first direction has good adjustment accuracy, which is conducive to ensuring that the length of the telescopic structure in the first direction has good adjustment accuracy.

[0007] In one possible embodiment, the telescopic portion has a through-slot, and a portion of the movable member is located within the through-slot and abuts against the inner wall of the through-slot. By providing the telescopic portion with a through-slot and positioning the movable member within the through-slot, the movable member can push the telescopic portion during movement along the lead screw, thereby ensuring that the movable member can drive the telescopic portion to move in the first direction. Furthermore, the telescopic portion and the movable member partially overlap in structure, which facilitates the compactness of the telescopic portion and movable member configuration, thereby miniaturizing the telescopic structure.

[0008] In one possible embodiment, the screw rod extends along a second direction, the second direction and the first direction form an angle, the through slot extends in a direction perpendicular to its depth, and the extension direction of the through slot forms an angle with both the first direction and the second direction. By having the screw rod extend along the second direction, the second direction and the first direction form an angle, and the extension direction of the through slot form an angle with both the first direction and the second direction, it is beneficial to reduce the friction between the moving part and the inner wall of the through slot, improve the service life of the moving part, and ensure that the moving part and the inner wall of the through slot always maintain an abutment state, thereby ensuring the efficiency of the moving part in driving the telescopic part to move, and avoiding the moving part from moving in vain during movement.

[0009] In one possible embodiment, the through-slot extends in a straight line. By extending the through-slot in a straight line, the through-slot has a uniform slope at all locations along its extension direction. This ensures that the frictional force exerted on the inner wall of the through-slot by the moving member during movement is comparable, and the efficiency of the moving member in driving the telescopic portion to move remains substantially unchanged, thereby facilitating the stability of the process in which the moving member drives the telescopic portion to move.

[0010] In one possible embodiment, the telescopic structure further includes a transmission assembly, the transmission assembly including at least two sequentially meshing gears, the at least two gears including a first gear and a second gear, the first gear connected to the drive assembly, the second gear connected to the lead screw, and the gear ratio of the second gear to the first gear being less than 1. By making the transmission assembly include at least two sequentially meshing gears, the at least two gears including a first gear and a second gear, the first gear connected to the drive assembly, the second gear connected to the lead screw, and the gear ratio of the second gear to the first gear being less than 1, the first gear drives the second gear to rotate, and the speed of the second gear is greater than the speed of the first gear, which facilitates the transmission assembly to achieve an increase in speed in the process of the drive assembly driving the lead screw to rotate.

[0011] In one possible embodiment, the at least two gears are arranged sequentially in the first direction, with the first gear and the second gear respectively located at the ends of the at least two gears in the first direction. By arranging the at least two gears sequentially in the first direction, with the first gear and the second gear respectively located at the ends of the at least two gears in the first direction, all gears in the transmission assembly can perform their transmission function, improving the utilization rate of each component in the transmission assembly and facilitating miniaturization of the transmission assembly.

[0012] In one possible embodiment, the at least two gears further include a third gear, which is a duplex gear. The third gear includes an upper gear and a lower gear, the gear ratio between the upper gear and the lower gear is less than 1, the upper gear meshes with the first gear, the gear ratio between the upper gear and the first gear is less than 1, the lower gear meshes with the second gear, and the gear ratio between the second gear and the lower gear is less than 1. By making the third gear a duplex gear, the third gear includes an upper gear and a lower gear, the upper gear meshes with the first gear, the gear ratio between the upper gear and the first gear is less than 1, the lower gear meshes with the second gear, and the gear ratio between the second gear and the lower gear is less than 1, so that the rotational speed of the upper gear is greater than the rotational speed of the first gear, the rotational speed of the second gear is greater than the rotational speed of the lower gear, and the rotational speeds of the upper and lower gears are equal, that is, the rotational speed of the second gear is greater than the rotational speed of the first gear, thereby achieving speed increase during the transmission process from the first gear to the second gear.

[0013] In one possible embodiment, the drive assembly includes an input shaft connected to the first gear, parallel to the lead screw, and located on the same side of the transmission assembly. By ensuring that the drive assembly includes an input shaft connected to the first gear, parallel to the lead screw, and located on the same side of the transmission assembly, the drive assembly, the transmission assembly, and the lead screw are foldable, ensuring a regular arrangement of the drive assembly, the transmission assembly, and the lead screw, simplifying the assembly process of the telescopic structure and achieving miniaturization of the telescopic structure.

[0014] In one possible embodiment, the drive assembly further comprises a torsion bar and a knob, one end of the torsion bar being connected to the knob, the other end of the torsion bar having an inner channel, the end of the input shaft away from the first gear being located within the inner channel, and the input shaft and the torsion bar being cooperatively connected. By making the drive assembly further comprise a torsion bar and a knob, one end of the torsion bar being connected to the knob, the other end of the torsion bar having an inner channel, the end of the input shaft away from the first gear being located within the inner channel, and the input shaft and the torsion bar being cooperatively connected, the drive assembly can be manually driven, the torsion bar and the knob being fixedly connected, the connection between the knob and the torsion bar having good stability, the torsion bar and the input shaft being cooperatively connected, the torsion bar being able to move relative to the input shaft in its extension direction, and the total length of the torsion bar and the input shaft in the direction in which the torsion bar extends being adjusted by changing the relative positional relationship between the torsion bar and the input shaft.

[0015] In one possible embodiment, the inner wall of the inner channel has a retaining groove, and a portion of the input shaft is positioned within the retaining groove and abuts the inner wall of the retaining groove. By having the retaining groove on the inner wall of the inner channel and a portion of the input shaft positioned within the retaining groove and abutting the inner wall of the retaining groove, the contact area between the input shaft and the torsion bar is increased, thereby improving the stability of the mating connection between the input shaft and the torsion bar.

[0016] In one possible embodiment, the limiting groove extends in the same direction as the torsion bar, and the limiting groove is shorter than the torsion bar. This arrangement increases the area of ​​the two opposing sidewalls of the limiting groove, enables the torsion bar to rotate the input shaft, and ensures the stability of the relative position of the torsion bar and the input shaft. Furthermore, the limiting groove is shorter than the torsion bar, preventing the limiting groove from being excessively long, which helps ensure the mechanical strength of the torsion bar.

[0017] In one possible embodiment, the drive assembly further includes a limiting ring, which is disposed around the input shaft. The limiting ring has an inner diameter smaller than the outer diameter of the torsion bar, and an outer diameter larger than the inner diameter of the torsion bar. The input shaft and the bottom wall of the inner channel are spaced apart. By having the drive assembly further include a limiting ring and having the limiting ring disposed around the input shaft, the limiting ring is prevented from interfering with the normal rotation of the input shaft, and the limiting ring limits the input shaft in its radial direction, which is conducive to ensuring the positional stability of the central axis of the input shaft. By having the inner diameter of the limiting ring smaller than the outer diameter of the torsion bar, and the outer diameter of the limiting ring larger than the inner diameter of the torsion bar, the torsion bar can contact the limiting ring, thereby limiting the range of movement of the torsion bar by the limiting ring, and ensuring that the input shaft and the bottom wall of the inner channel are spaced apart, thus avoiding interference between the input shaft and the torsion bar.

[0018] In one possible embodiment, the torsion bar moves along its extension direction, and the distance between the torsion bar and the retaining ring is less than the length of the input shaft end located in the inner channel protruding from the retaining ring. By allowing the torsion bar to move along its extension direction and the distance between the torsion bar and the retaining ring to be less than the length of the input shaft end located in the inner channel protruding from the retaining ring, a portion of the input shaft is always located within the inner channel, thereby ensuring a secure connection between the input shaft and the torsion bar and preventing the torsion bar from separating from the input shaft.

[0019] In one possible embodiment, the drive assembly further includes a sleeve, wherein at least a portion of the torsion bar and a portion of the input shaft are located within the sleeve, the torsion bar and an inner wall of the sleeve are spaced apart, and at least a portion of the knob is located outside the sleeve. By including the sleeve, wherein at least a portion of the torsion bar and a portion of the input shaft are located within the sleeve, and the torsion bar and an inner wall of the sleeve are spaced apart, the sleeve facilitates protection of the torsion bar and the input shaft. By locating at least a portion of the knob outside the sleeve, the knob is positioned so that it can be easily rotated manually.

[0020] In one possible embodiment, the drive assembly further includes an elastic member, the elastic member being located within the sleeve, the torsion bar having a through hole, the through hole penetrating opposite sides of the outer surface of the torsion bar, the elastic member being connected to the inner wall of the through hole, and a portion of the elastic member extending from openings on either side of the through hole and abutting against the inner wall of the sleeve. By making the drive assembly further include an elastic member, the elastic member being located within the sleeve, the torsion bar having a through hole penetrating opposite sides of the outer surface of the torsion bar, and the elastic member being connected to the inner wall of the through hole, the connection between the elastic member and the torsion bar is located on the inner side of the torsion bar, which is beneficial to improving the stability of the connection between the elastic member and the torsion bar; a portion of the elastic member extending from openings on either side of the through hole and abutting against the inner wall of the sleeve, so that a portion of the elastic member is located between the torsion bar and the inner wall of the sleeve, thereby achieving radial positioning of the torsion bar by the elastic member, which is beneficial to ensuring the positional stability of the central axis of the torsion bar.

[0021] In one possible embodiment, the portion of the elastic member extending from the through-hole opening is arc-shaped and protrudes toward the inner wall of the sleeve. This arc-shaped portion of the elastic member extending from the through-hole opening and protruding toward the inner wall of the sleeve helps reduce friction between the curved section and the inner wall of the sleeve, prevents the elastic member from interfering with the normal rotation of the torsion bar and the movement of the torsion bar in its extension direction, and improves the service life of the elastic member.

[0022] In a possible embodiment, the drive assembly includes a motor. By making the drive assembly include a motor, the drive assembly can be electrically driven, thereby improving the driving efficiency of the screw rod.

[0023] In one possible embodiment, the telescopic structure further includes a bracket, the length of which is greater than or equal to the length of the lead screw, and at least a portion of the moving member is located between the lead screw and the bracket. By including the bracket in the telescopic structure, the length of which is greater than or equal to the length of the lead screw, and at least a portion of the moving member being located between the lead screw and the bracket, the bracket can limit the moving member as it moves along the lead screw, thereby improving the stability of the moving member as it moves along the lead screw.

[0024] In a second aspect, the present application further provides a fastening structure comprising a belt and the telescopic structure described in any one of the embodiments of the first aspect, wherein the belt and the telescopic structure are connected to form a ring-shaped or arc-shaped structure. The beneficial effects of this embodiment are similar to those of the above embodiments and are not further described in detail in this embodiment.

[0025] In a third aspect, the present application further provides a watch comprising a dial, a watchband, and the telescopic structure described in any one of the embodiments of the first aspect, wherein the watchband is connected to the dial, and the telescopic structure is connected to the watchband; the dial, the watchband, and the telescopic structure together enclose an annular structure, and the telescopic structure is used to adjust the circumference of the annular structure. The beneficial effects of this embodiment are similar to those of the above embodiments and are not further described in this embodiment.

[0026] In one possible embodiment, the watch further includes a housing and a butterfly clasp, the telescopic structure is located within the housing, the screw rod of the telescopic structure is connected to the inner surface of the housing, the butterfly clasp is located outside the housing, one end of the butterfly clasp is connected to the outer surface of the housing, and the watch strap includes a first strap and a second strap, the two ends of the first strap are respectively connected to the telescopic portion of the telescopic structure and the dial, and the two ends of the second strap are respectively connected to the other end of the butterfly clasp and the dial. By having the watch further include a housing and a butterfly clasp, the two ends of the first strap are respectively connected to the telescopic portion of the telescopic structure and the dial, and the two ends of the second strap are respectively connected to the other end of the butterfly clasp and the dial, so that the butterfly clasp can achieve a wide range of adjustment of the ring size of the annular structure.

[0027] In one possible embodiment, the watch further includes a pressure sensor electrically connected to the drive assembly of the telescopic structure. The pressure sensor is used to detect the restraining pressure of the watch, and the drive assembly is used to adjust the telescopic structure based on the restraining pressure. By including a pressure sensor electrically connected to the drive assembly of the telescopic structure, detecting the restraining pressure of the watch, and adjusting the telescopic structure based on the restraining pressure, the watch can be prevented from being too tight or too loose, thereby improving wearing comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the telescopic structure provided in an embodiment of the present application;

[0029] Figure 2 is a rear view of the telescopic structure provided by an embodiment of the present application with the moving member located at the first end;

[0030] Figure 3 yes Figure 2 A schematic structural diagram of a telescopic structure without a telescopic portion in the illustrated embodiment;

[0031] Figure 4 is a rear view of the telescopic structure provided by an embodiment of the present application with the moving member located at the second end;

[0032] Figure 5 yes Figure 4 A schematic structural diagram of a telescopic structure without a telescopic portion in the illustrated embodiment;

[0033] Figure 6 This is a rear view of the telescopic structure with arc-shaped extension of the through slot provided in an embodiment of the present application;

[0034] Figure 7 yes Figure 1 A schematic structural diagram of the telescopic structure of the embodiment shown in FIG. 1 , in which no gear cover is provided;

[0035] Figure 8 yes Figure 7 A front view of the telescopic structure without the telescopic portion in the illustrated embodiment;

[0036] Figure 9 This is a front view of a telescopic structure of a transmission assembly for achieving speed increase provided in an embodiment of the present application;

[0037] Figure 10 yes Figure 9 A top view of the telescopic structure in the illustrated embodiment;

[0038] Figure 11 It is a front view of a telescopic structure of a transmission assembly for achieving deceleration provided in an embodiment of the present application;

[0039] Figure 12 yes Figure 11 A top view of the telescopic structure in the illustrated embodiment;

[0040] Figure 13 It is a schematic structural diagram of a drive assembly provided in an embodiment of the present application;

[0041] Figure 14 yes Figure 13 An exploded view of the drive assembly in the illustrated embodiment;

[0042] Figure 15 Schematic diagram of the structure of the input shaft, torsion bar and knob provided in the embodiment of the present application;

[0043] Figure 16 Schematic diagram of the structure of the torsion bar provided in the embodiment of the present application;

[0044] Figure 17 yes Figure 16 a top view of the torsion bar in the illustrated embodiment;

[0045] Figure 18 1 is a schematic structural diagram of a torsion bar with a limiting groove provided in an embodiment of the present application;

[0046] Figure 19 yes Figure 18 a top view of the torsion bar in the illustrated embodiment;

[0047] Figure 20 yes Figure 18 A top view of the torsion bar and input shaft connection in the illustrated embodiment;

[0048] Figure 21 yes Figure 16 A cross-sectional view of the torsion bar at CC in the illustrated embodiment;

[0049] Figure 22 yes Figure 15A cross-sectional view of the input shaft, torsion bar, and knob at BB in the illustrated embodiment;

[0050] Figure 23 Schematic diagram of the structure of the limit ring, input shaft, torsion bar and knob in a contact state of the limit ring and torsion bar provided in an embodiment of the present application;

[0051] Figure 24 Schematic diagram of the structure of the limiting ring, input shaft, torsion bar and knob in a spaced-apart state provided by an embodiment of the present application;

[0052] Figure 25 yes Figure 13 A cross-sectional view of the drive assembly at AA in the illustrated embodiment;

[0053] Figure 26 This is a schematic structural diagram of a drive assembly without a sleeve provided in an embodiment of the present application;

[0054] Figure 27 is a schematic structural diagram of an elastic member provided in an embodiment of the present application;

[0055] Figure 28 yes Figure 1 An exploded view of the telescopic structure in the illustrated embodiment;

[0056] Figure 29 It is a structural schematic diagram of a moving part provided in an embodiment of the present application;

[0057] Figure 30 This is a schematic structural diagram of a telescopic structure with a lower cover provided in an embodiment of the present application;

[0058] Figure 31 It is a structural schematic diagram of a telescopic structure provided with a housing provided in an embodiment of the present application;

[0059] Figure 32 is a schematic structural diagram of a watch provided in an embodiment of the present application;

[0060] Figure 33 It is a system diagram of a watch provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0062] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this application are explained and described below.

[0063] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0064] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0065] It should be understood that the term "and / or" as used herein is simply a term used to describe the existence of three possible relationships between related objects. For example, "A and / or B" can represent the existence of A alone, the existence of both A and B, and the existence of B alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0066] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0067] It should be understood that the terms “first”, “second”, etc. used in this application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0068] In the description of this application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting this application.

[0069] In the description of this application, it should be noted that due to manufacturing errors or assembly errors, there are some angular deviations in the design that should be vertical or parallel. For example, the deviation is within 15 degrees, which also falls within the vertical or parallel described in this embodiment.

[0070] When used in this application, "within the range of...", unless it is specifically stated that the end value is not included, it is assumed that both end values ​​of the range are included. For example, in the range of 1 to 5, the two values ​​1 and 5 are included.

[0071] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0072] It should be understood that, in this application, "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as the connection between different components in a circuit structure through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit signals. "Connection" and "connected" can both refer to a mechanical or physical connection relationship. For example, "A and B are connected" or "A and B are connected" can mean that there is a fastening member (such as a screw, bolt, rivet, etc.) between A and B, or that A and B are in contact with each other and A and B are difficult to separate.

[0073] In this application, "length" can be understood as the physical length of an object or the electrical length. Electrical length can be expressed as the ratio of the physical length (i.e., mechanical length or geometric length) multiplied by the propagation time of an electrical or electromagnetic signal in a medium to the time required for the signal to travel the same distance in free space as the physical length of the medium. Electrical length can satisfy the following formula:

[0074]

[0075] Where L is the physical length, a is the propagation time of the electrical or electromagnetic signal in the medium, and b is the propagation time in free space.

[0076] Alternatively, electrical length can also refer to the ratio of physical length (i.e., mechanical length or geometric length) to the wavelength of the transmitted electromagnetic wave. The electrical length can satisfy the following formula:

[0077]

[0078] Where L is the physical length and λ is the wavelength of the electromagnetic wave.

[0079] Wearable products, including watches, glasses, helmets, belts, and headphones, typically require adjustable length fastening structures to ensure wearability and comfort. For example, the fastening structure of a watch is the strap. Because wrist circumference varies from user to user, the overall length of the strap must be adjusted to ensure easy donning and removal.

[0080] When a watch uses a metal strap, it is composed of multiple sequentially connected metal links. Adjusting the length of the metal strap requires specialized tools to remove or install the links. Adjusting the length of the metal strap is accomplished by adjusting the number of links in the strap, making the adjustment process relatively complex. Furthermore, to ensure the structural strength and aesthetics of the metal strap, the length of each link is typically large, resulting in a larger minimum unit for adjusting the length of the metal strap and poor adjustment accuracy.

[0081] When a watch uses a leather or rubber strap, it is usually equipped with a pin and multiple spaced buttonholes. The length of the strap is adjusted by adjusting the pin and the buttonholes at different positions. To ensure the structural strength of the strap, the distance between two adjacent buttonholes cannot be designed to be too small. As a result, the adjustment accuracy of the strap length is limited by the spacing between the buttonholes, resulting in poor length adjustment accuracy of the strap using a pin and buttonhole combination.

[0082] When a watch uses a magnetic sheet or Velcro, there are fewer restrictions on the adjustment of the strap length, which makes the adjustment accuracy of the strap length better. However, the magnetic force generated by the magnet and the adhesion force generated by the Velcro are both small, and the adhesion force of the Velcro is easily reduced after a long period of use, resulting in poor fastening of the strap and easy falling off during wearing.

[0083] Therefore, when adjusting the length of the fastening structure of current wearable products, it is usually restricted by its material. Different adjustment methods need to be adopted according to the fastening structure of different materials. For example, metal materials need to adjust the number of chain links, and rubber materials need to adjust the engagement of the buckle pin with different buckle holes. This results in poor applicability of the length adjustment mode of the fastening structure. At the same time, in order to ensure the structural strength and fixation stability of the fastening structure, the material of the fastening structure also limits the minimum unit of length adjustment, resulting in a large minimum unit of length adjustment and poor adjustment accuracy of the fastening structure. If magnetic force or adhesive force is used to achieve fixation of the fastening structure after length adjustment, although the adjustment accuracy of the fastening structure is improved, its fastening strength is reduced, and it is impossible to simultaneously meet good adjustment accuracy and good fastening strength.

[0084] This application provides a telescopic structure 100, please refer to Figure 1 , Figure 1A structural schematic diagram of the telescopic structure 100 provided in an embodiment of the present application is shown, wherein the telescopic structure 100 includes a screw rod 10 and a movable member 20, wherein the movable member 20 has a mounting hole 211, and the screw rod 10 passes through the mounting hole 211 so that the movable member 20 is sleeved on the outer periphery of the screw rod 10, and the inner wall of the mounting hole 211 has a thread, and the thread on the inner wall of the mounting hole 211 matches the thread on the screw rod 10, so that the movable member 20 and the screw rod 10 are threadedly connected.

[0085] Since the moving part 20 and the screw rod 10 are threadedly connected, there is a large contact area between the inner wall of the mounting hole 211 of the moving part 20 and the threaded outer surface of the screw rod 10, so that the friction between the moving part 20 and the screw rod 10 is large, and the moving part 20 is not easy to move relative to the screw rod 10. There is good locking performance between the moving part 20 and the screw rod 10, so that the moving part 20 has good position stability relative to the screw rod 10.

[0086] When the screw 10 rotates, the moving member 20 can reciprocate along the extension direction of the screw 10. The distance the moving member 20 moves in the extension direction of the screw is related to the number of turns of the screw 10. When the screw 10 rotates one turn, the distance the moving member 20 moves in the extension direction of the screw is equal to the thread pitch of the screw 10. The thread pitch of the screw 10 is the distance between two adjacent teeth on the thread of the screw 10. The thread pitch of the screw 10 can be set according to actual needs to ensure the tightness of the connection between the moving member 20 and the screw 10. The thread pitch of the screw rod 10 is usually small, so that the moving part 20 can move a smaller distance in the extension direction of the screw. At the same time, due to the good locking performance between the moving part 20 and the screw rod 10, after the moving part 20 moves along the screw rod 10, the moving part 20 can be better fixed relative to the screw rod 10, so that when the rotation angle of the screw rod 10 does not reach one circle, the moving part 20 can still be fixed relative to the screw rod 10, that is, the moving distance of the moving part 20 in the extension direction of the screw can be less than the thread pitch of the screw rod 10, so that the adjustment of the relative position of the moving part 20 on the screw rod 10 has better adjustment accuracy.

[0087] See also Figure 1 and Figure 2 , Figure 2 A rear view of a telescopic structure 100 in which the moving part 20 provided in an embodiment of the present application is located at the first end is shown. The telescopic structure 100 also includes a telescopic portion 30 and a drive assembly 40. The drive assembly 40 is used to drive the screw rod 10 to rotate so that the moving part 20 moves along the screw rod 10. The drive assembly 40 controls the number of rotations of the screw rod 10, and can adjust the moving distance of the moving part 20 along the screw rod 10. The drive assembly 40 controls the rotation direction of the screw rod 10, and can adjust the moving direction of the moving part 20 along the screw rod 10.

[0088] It is understood that the greater the number of turns that the drive assembly 40 controls the screw rod 10 to rotate in a single direction, the greater the distance that the moving member 20 moves along the screw rod 10. When the drive assembly 40 controls the screw rod 10 to rotate clockwise, the moving direction of the moving member 20 is opposite to that when the drive assembly 40 controls the screw rod 10 to rotate counterclockwise. In one embodiment, please refer to Figure 3 , Figure 3 Shown Figure 2 In the structural schematic diagram of the telescopic structure 100 in the embodiment shown, the telescopic part 30 is not provided. The screw rod 10 has a first end and a second end opposite to each other in its extension direction. When the screw rod 10 rotates clockwise, the moving part 20 moves from the first end toward the second end; when the screw rod 10 rotates counterclockwise, the moving part 20 moves from the second end toward the first end.

[0089] The telescopic portion 30 is connected to the moving member 20 so that when the moving member 20 moves along the screw rod 10 , the moving member 20 can drive the telescopic portion 30 to move together, and the moving member 20 drives the telescopic portion 30 to move along the first direction to adjust the length of the telescopic structure 100 in the first direction.

[0090] Specifically, the screw rod 10 has a first end and a second end opposite to each other in its extending direction. When the moving member 20 is located at the first end of the screw rod 10, refer to Figure 2 and Figure 3 The telescopic portion 30 has a high degree of structural overlap with the moving member 20 and the screw rod 10, making the telescopic structure 100 more compact. The telescopic structure 100 is movable in the first direction (such as Figure 2 and Figure 3 When the moving member 20 is located at the second end of the screw rod 10, refer to Figure 4 and Figure 5 , Figure 4 FIG2 shows a rear view of the telescopic structure 100 with the moving member 20 located at the second end provided in an embodiment of the present application. Figure 5 Shown Figure 4 The telescopic structure 100 is a schematic diagram of a structure in which the telescopic portion 30 is not provided in the embodiment shown. The telescopic portion 30 has a low degree of overlap with the moving member 20 and the screw rod 10, so that the structure of the telescopic structure 100 is relatively loose. The telescopic structure 100 is in the first direction (such as Figure 4 and Figure 5 The length in the X direction (as shown) is L2, and the telescopic structure 100 satisfies the relationship: L2>L1.

[0091] By making the telescopic structure 100 satisfy the above relationship, when the moving member 20 moves from the first end toward the second end of the screw rod 10, the moving member 20 drives the telescopic portion 30 to move along the first direction, and the length of the telescopic structure 100 in the first direction gradually increases; when the moving member 20 moves from the second end toward the first end of the screw rod 10, the moving member 20 drives the telescopic portion 30 to move in the opposite direction of the first direction, and the length of the telescopic structure 100 in the first direction gradually decreases, thereby achieving adjustment of the length of the telescopic structure 100 in the first direction.

[0092] Since the telescopic portion 30 moves along with the movement of the moving member 20, the movement process of the telescopic portion 30 is affected by the movement process of the moving member 20 along the screw rod 10. The greater the distance the moving member 20 moves along the screw rod 10, the greater the movement distance of the telescopic portion 30 in the first direction. The moving member 20 can have a smaller movement distance in the extension direction of the screw rod 10, so that the telescopic portion 30 can also have a smaller movement distance in the first direction, ensuring that the length of the telescopic structure 100 in the first direction has good adjustment accuracy. At the same time, there is good locking performance between the moving member 20 and the screw rod 10. After the moving member 20 moves a certain distance along the screw rod 10, the moving member 20 can be well fixed relative to the screw rod 10, so that the telescopic portion 30 can be fixed as the moving member 20 is fixed. The fixed position of the telescopic portion 30 has good stability, which is conducive to keeping the length of the telescopic structure 100 in the first direction unchanged after the position of the telescopic portion 30 is fixed.

[0093] The present application provides a telescopic structure 100, which includes a screw rod 10, a moving part 20, a telescopic portion 30 and a drive assembly 40. The screw rod 10 and the moving part 20 are cooperatively connected, so that there is good locking performance between the moving part 20 and the screw rod 10, and the adjustment of the relative position of the moving part 20 on the screw rod 10 has good adjustment accuracy.

[0094] The drive assembly 40 is used to drive the screw 10 to rotate, so that the moving member 20 can move along the screw 10. The telescopic portion 30 is connected to the moving member 20, so that the telescopic portion 30 can move along the first direction as the moving member 20 moves, so as to adjust the length of the telescopic structure 100 in the first direction. Since the telescopic portion 30 is driven by the moving member 20, the movement of the telescopic portion 30 is affected by the movement of the moving member 20 along the screw 10. There is good locking performance between the moving member 20 and the screw 10, so that the position of the telescopic portion 30 is fixed with good stability, which is conducive to ensuring the stability of the length of the telescopic structure 100 after adjustment; the adjustment of the relative position of the moving member 20 on the screw 10 has good adjustment accuracy, so that the movement distance of the telescopic portion 30 in the first direction has good adjustment accuracy, which is conducive to ensuring that the length of the telescopic structure 100 in the first direction has good adjustment accuracy.

[0095] For a possible implementation, see Figure 2 and Figure 3 The telescopic portion 30 has a through slot 31, and part of the moving member 20 is located in the through slot 31, and the part of the moving member 20 located in the through slot 31 abuts against the inner wall of the through slot 31, so that the moving member 20 can push the telescopic portion 30 during the movement along the screw rod 10, thereby ensuring that the moving member 20 can drive the telescopic portion 30 along the first direction (such as Figure 2 and Figure 3 At the same time, since part of the moving member 20 is located in the through slot 31, the telescopic portion 30 and the moving member 20 partially overlap in structure, which is beneficial to improving the compactness of the structural arrangement of the telescopic portion 30 and the moving member 20 and realizing the miniaturization of the telescopic structure 100.

[0096] When part of the moving part 20 is located in the through groove 31, the inner wall of the through groove 31 limits the moving part 20, preventing the moving part 20 from rotating as the screw rod 10 rotates, so that the moving part 20 is subjected to a force along the extension direction of the screw rod 10, ensuring that the moving part 20 can move along the screw rod 10, thereby driving the movement of the telescopic part 30, and realizing the adjustment of the length of the telescopic structure 100 in the first direction.

[0097] The through groove 31 can run through the telescopic portion 30 so that part of the moving member 20 abuts against the sidewall of the through groove 31, which is conducive to reducing the thickness of the telescopic portion 30, improving the overlap between the telescopic portion 30 and the moving member 20, increasing the contact area between the moving member 20 and the telescopic portion 30, and ensuring the stability of the process in which the moving member 20 drives the telescopic portion 30 to move. The through groove 31 can also not run through the telescopic portion 30 so that part of the moving member 20 abuts against the sidewall and / or bottom wall of the through groove 31, which is conducive to realizing the limiting of the moving member 20 in more directions, increasing the contact area between the moving member 20 and the telescopic portion 30, and ensuring the stability of the process in which the moving member 20 drives the telescopic portion 30 to move.

[0098] In one embodiment, see Figure 1 and Figure 2 , the screw rod 10 moves in the second direction (such as Figure 1 and Figure 2 The moving member 20 has a connected moving portion 21 and a connecting portion 22, the moving portion 21 has a mounting hole 211, the inner wall of the mounting hole 211 has a thread, the screw rod 10 passes through the mounting hole 211, so that the moving portion 21 is sleeved on the outer periphery of the screw rod 10, and the moving portion 21 and the screw rod 10 are connected in a coordinated manner, and the connecting portion 22 is connected to the moving portion 21, and the connecting portion 22 is in a third direction (as shown). Figure 1The third direction is perpendicular to the second direction, so that the extension direction of the screw rod 10 is different from the stacking direction of the screw rod 10 and the moving member 20, which is beneficial to ensure that the telescopic portion 30 has a sufficient size and avoids interference between the screw rod 10 and the telescopic portion 30.

[0099] The size of the through slot 31 can be comparable to that of the connecting portion 22, so that the connecting portion 22 is clamped in the through slot 31, and the telescopic portion 30 and the connecting portion 22 are tightly connected, which is beneficial to ensuring the tightness of the connection between the telescopic portion 30 and the moving part 20; the size of the through slot 31 can also be larger than the size of the connecting portion 22, so that the connecting portion 22 can move in the through slot 31, and the moving part 20 and the telescopic portion 30 are slidably connected, which is beneficial to adjusting the moving direction of the telescopic portion 30 by setting the shape of the through slot 31.

[0100] In one embodiment, see Figure 1 and Figure 2 , the screw rod 10 moves in the second direction (such as Figure 1 and Figure 2 The moving member 20 moves in the second direction, and the second direction and the first direction (as shown in the Y direction) are extended. Figure 1 and Figure 2 The through slot 31 extends in a direction perpendicular to its depth and penetrates the telescopic portion 30 along the third direction. That is, the depth direction of the through slot 31 is the third direction, so that the through slot 31 extends in a direction perpendicular to the third direction. The extension direction of the through groove 31 and the first direction have an angle, which is beneficial to reducing the friction between the connecting portion 22 of the moving part 20 and the inner wall of the through groove 31, ensuring that the moving part 20 can move along the second direction, and reducing the wear of the moving part 20 during the movement, thereby improving the service life of the moving part 20; at the same time, the extension direction of the through groove 31 and the second direction have an angle, which is beneficial to ensuring that the connecting portion 22 of the moving part 20 and the inner wall of the through groove 31 always maintain abutment state, thereby ensuring the efficiency of the moving part 20 in driving the telescopic part 30 to move, and avoiding the moving part 20 from moving in vain during the movement, resulting in the moving part 20 only moving in the through groove 31 and unable to drive the telescopic part 30 to move.

[0101] For example, see Figure 1 and Figure 2 The second direction is perpendicular to the first direction, so that the length of the telescopic structure 100 in the first direction is minimally affected by the length of the screw rod 10 itself. The angle between the extension direction of the through slot 31 and the first direction and the second direction is approximately 45 degrees, so that when the moving part 20 moves along the second direction or the opposite direction of the second direction, the friction between the moving part 20 and the inner wall of the through slot 31 is small, which is beneficial to reducing the wear of the moving part 20 during the movement process.

[0102] The through slot 31 may extend in a straight line or not. Figure 2 and Figure 6 The illustrated embodiment describes the shape of the through groove 31 in detail.

[0103] In one embodiment, see Figure 2 The through-slot 31 extends in a straight line. Since the extending direction of the through-slot 31 is at an angle to both the first direction and the second direction, the extending direction of the through-slot 31 is inclined relative to the second direction. The extending direction of the through-slot 31 can be inclined relative to the second direction toward the first direction, or the extending direction of the through-slot 31 can be inclined relative to the second direction toward the opposite direction of the first direction. This is not limited in the present application. When the through-slot 31 extends in a straight line, the slope of the through-slot 31 at all points along its extending direction is equal, so that the friction force on the inner wall of the through-slot 31 applied to the movable member 20 during movement is equal, and the efficiency of the movable member 20 in driving the telescopic portion 30 to move remains substantially unchanged, which is conducive to ensuring the stability of the process in which the movable member 20 drives the telescopic portion 30 to move.

[0104] In one embodiment, see Figure 6 , Figure 6 The rear view of the telescopic structure 100 with the through slot 31 extending in an arc shape provided by an embodiment of the present application is shown. The through slot 31 extends along an arc line, and the arc line can protrude toward the side close to the first end of the screw rod 10, or the arc line can protrude toward the side close to the second end of the screw rod 10, and the present application does not impose any restrictions on this. When the through slot 31 extends along the arc line, the slope of the through slot 31 in its extending direction will change, so that the friction force on the inner wall of the through slot 31 to which the moving part 20 is subjected during the movement will change, and the efficiency of the moving part 20 in driving the telescopic part 30 to move will also change. When the through slot 31 is compared with the first direction (such as Figure 6 When the slope of the X direction is large, the extending direction of the through slot 31 is close to the second direction (as shown in FIG. Figure 6When the through-slot 31 has a smaller slope than the first direction, the extending direction of the through-slot 31 is close to the first direction, and the friction force on the moving member 20 is larger. The moving member 20 moves a fixed distance in the second direction, and the telescopic portion 30 moves a larger distance in the first direction. Therefore, by extending the through-slot 31 along an arc, the efficiency of the moving member 20 in driving the telescopic portion 30 to move can be adjusted by adjusting the shape of the through-slot 31, thereby achieving variable adjustment of the efficiency of the telescopic portion 30 moving in the first direction.

[0105] For a possible implementation, see Figure 1 and Figure 7 , Figure 7 Shown Figure 1 A schematic diagram of the structure of the telescopic structure 100 in the illustrated embodiment is shown without the gear cover 55. The telescopic structure 100 also includes a transmission assembly 50, which is disposed between the drive assembly 40 and the screw 10 and is used to transfer kinetic energy between the drive assembly 40 and the screw 10. The transmission assembly 50 includes at least two sequentially meshing gears. The at least two gears mesh sequentially, allowing transmission between the at least two gears to achieve stable kinetic energy transfer. The number of gears is at least two, allowing the drive assembly 40 and the screw 10 to be connected to different gears, respectively, and the transfer of kinetic energy from the drive assembly 40 to the screw 10 is achieved through the at least two gears.

[0106] For details, please refer to Figure 8 , Figure 8 Shown Figure 7 The illustrated embodiment shows a front view of the telescopic structure 100 without the telescopic portion 30. The transmission assembly 50 includes a first gear 51 and a second gear 52. The first gear 51 is connected to the drive assembly 40, and the second gear 52 is connected to the screw 10. The drive assembly 40 drives the first gear 51 to rotate, which in turn drives the second gear 52 to rotate. The second gear 52 then drives the screw 10 to rotate, so that the first gear 51 inputs kinetic energy into the transmission assembly 50, and the second gear 52 outputs kinetic energy from the transmission assembly 50.

[0107] In one embodiment, see Figure 8 , at least two gears are arranged in sequence in the first direction, and the first gear 51 and the second gear 52 are respectively located at least two gears in the first direction (such as Figure 8The two ends of the transmission assembly 50 in the X direction are arranged so that the input gear of the kinetic energy and the output gear of the kinetic energy are respectively located at the two ends of the transmission assembly 50 in the first direction. All the gears in the transmission assembly 50 can realize the transmission function, which improves the utilization rate of each component in the transmission assembly 50 and is conducive to the miniaturization of the transmission assembly 50. At the same time, the screw rod 10 and the drive assembly 40 are arranged in the second direction (as shown in FIG. Figure 8 The second direction is perpendicular to the first direction, and the transmission component 50 changes the transmission direction of kinetic energy, thereby realizing the kinetic energy transmission between the screw rod 10 and the drive component 40 in a parallel state, so that the structure of the screw rod 10, the transmission component 50 and the drive component 40 is folded, and the structural arrangement of the screw rod 10, the transmission component 50 and the drive component 40 is more regular, which is conducive to the miniaturization of the telescopic structure 100.

[0108] The transmission assembly 50 can not only change the direction of kinetic energy transmission by setting the arrangement direction of at least two gears, but also realize the speed increase and speed decrease of the screw rod 10 during the rotation of the drive assembly 40 by designing the gear ratio between two adjacent gears. Figures 8 to 12 The illustrated embodiment illustrates a transmission design with at least two gears.

[0109] In one embodiment, see Figure 8 The tooth ratio between two adjacent gears is equal to 1, at least two gears can only realize the change of the transmission direction of kinetic energy, and at least two gears cannot realize the change of the speed during the rotation of the drive component 40 driving the screw rod 10, so that the transmission component 50 in this embodiment is suitable for situations where speed increase or deceleration is not required, and the design of the transmission component 50 is relatively simple.

[0110] In one embodiment, see Figure 9 and Figure 10 , Figure 9 FIG. 1 shows a front view of a telescopic structure 100 for realizing speed increase by a transmission assembly 50 provided in an embodiment of the present application. Figure 10 Shown Figure 9A top view of the telescopic structure 100 in the illustrated embodiment. The gear ratio of the second gear 52 to the first gear 51 is less than 1, so that the number of teeth of the first gear 51 is greater than the number of teeth of the second gear 52. When the first gear 51 rotates a first angle, the first gear 51 drives the second gear 52 to rotate a second angle. Since the gear ratio of the second gear 52 to the first gear 51 is less than 1, the second angle is greater than the first angle, that is, the second gear 52 rotates a larger angle than the first gear 51. The speed of the second gear 52 is greater than the speed of the first gear 51, so that the speed of the screw rod 10 connected to the second gear 52 is greater than the speed of the drive assembly 40 connected to the first gear 51, which helps the transmission assembly 50 to achieve an increase in the speed of the screw rod 10 driven by the drive assembly 40. When the drive assembly 40 manually drives the screw rod 10 to rotate, it is usually necessary to increase the speed of the driving process through the transmission assembly 50, making the manual driving process more labor-saving.

[0111] Generally, when the gear ratio between the second gear 52 and the first gear 51 is less than 1, the reference circle diameter of the second gear 52 is smaller than the reference circle diameter of the first gear 51. Furthermore, the smaller the gear ratio between the second gear 52 and the first gear 51, the greater the difference between the reference circle diameters of the second gear 52 and the first gear 51, and the more significant the speed-increasing effect of the first gear 51 on the second gear 52. The gear ratio between the second gear 52 and the first gear 51 can be adjusted according to actual needs to ensure the speed-increasing function and miniaturization of the transmission assembly 50, while also ensuring the stability of at least two gear structures and the transmission process.

[0112] The first gear 51 and the second gear 52 can be directly meshed, or other gears can be provided between the first gear 51 and the second gear 52 so that the first gear 51 and the second gear 52 are indirectly meshed. When the first gear 51 and the second gear 52 are directly meshed, the configuration of the transmission assembly 50 is relatively simple. In order to ensure that the transmission assembly 50 has sufficient speed-increasing capability, it is easy to cause a large difference between the reference circle diameter of the first gear 51 and the reference circle diameter of the second gear 52, making the size of the first gear 51 too large, affecting the miniaturization of the transmission assembly 50, or making the size of the second gear 52 too small, affecting the stability of the transmission process of the transmission assembly 50; when the first gear 51 and the second gear 52 are indirectly meshed, a certain number of gears can be provided between the first gear 51 and the second gear 52, and the transmission assembly 50 is gradually accelerated by multiple gears, so that the difference between the reference circle diameters of the two directly meshed gears is small, which is conducive to miniaturization of the transmission assembly 50 and ensures the stability of the transmission process of the transmission assembly 50.

[0113] For example, see Figure 9 and Figure 10The transmission assembly 50 also includes a third gear 53, which is located between the first gear 51 and the second gear 52. The third gear 53 is a duplex gear, comprising an upper gear 531 and a lower gear 532. The upper gear 531 and the lower gear 532 rotate coaxially, resulting in equal rotational speeds for the upper gear 531 and the lower gear 532. The upper gear 531 directly meshes with the first gear 51, and the gear ratio between the upper gear 531 and the first gear 51 is less than 1. This results in a smaller reference circle diameter for the upper gear 531 than for the first gear 51, and a higher rotational speed for the upper gear 531 than for the first gear 51, thereby increasing the speed of the transmission from the first gear 51 to the upper gear 531. The lower gear 532 directly meshes with the second gear 52, and the gear ratio between the second gear 52 and the lower gear 532 is less than 1. This results in a smaller reference circle diameter for the second gear 52 than for the lower gear 532, and a higher rotational speed for the second gear 52 than for the lower gear 532. Since the rotational speed of the lower gear 532 is equal to the rotational speed of the upper gear 531, that is, the rotational speed of the second gear 52 is greater than the rotational speed of the upper gear 531, and since the rotational speed of the upper gear 531 is greater than the rotational speed of the first gear 51, the rotational speed of the second gear 52 is greater than the rotational speed of the first gear 51, thereby achieving an increase in speed during the transmission process from the first gear 51 to the second gear 52.

[0114] Also, see Figure 10 , the gear ratio between the upper gear 531 and the lower gear 532 is less than 1, so that the reference circle diameter of the upper gear 531 is smaller than the reference circle diameter of the lower gear 532, which is conducive to ensuring that the upper gear 531 has a smaller size and the lower gear 532 has a larger size. The reference circle diameter of the upper gear 531 is smaller than the reference circle diameter of the first gear 51. When the upper gear 531 has a smaller size, the first gear 51 can have a smaller size, avoiding the first gear 51 from being too large, which is conducive to miniaturization of the transmission assembly 50. The reference circle diameter of the second gear 52 is smaller than the reference circle diameter of the lower gear 532. When the lower gear 532 has a larger size, the second gear 52 can have a larger size, avoiding the second gear 52 from being too small, which is conducive to ensuring the structural strength of the second gear 52 and ensuring the stability of the transmission process of the transmission assembly 50.

[0115] In one embodiment, see Figure 11 and Figure 12 , Figure 11 The figure shows a front view of a telescopic structure 100 for realizing deceleration by a transmission assembly 50 provided in an embodiment of the present application. Figure 12 Shown Figure 11A top view of the telescopic structure 100 in the illustrated embodiment. The gear ratio of the first gear 51 and the second gear 52 is less than 1, so that the number of teeth of the second gear 52 is greater than the number of teeth of the first gear 51. The base circle diameter of the first gear 51 is smaller than the base circle diameter of the second gear 52. The rotational speed of the first gear 51 is greater than the rotational speed of the second gear 52. This makes the rotational speed of the screw rod 10 connected to the second gear 52 less than the rotational speed of the drive assembly 40 connected to the first gear 51. This facilitates the transmission assembly 50 to achieve deceleration during the process of the drive assembly 40 driving the screw rod 10 to rotate. When the drive assembly 40 uses an electric drive to rotate the screw rod 10, it is usually necessary to achieve deceleration of the driving process through the transmission assembly 50 to improve the accuracy of the electric control process.

[0116] Similarly, the greater the difference between the reference circle diameter of the second gear 52 and the reference circle diameter of the first gear 51, the more significant the deceleration effect of the first gear 51 on the second gear 52. The gear ratio of the second gear 52 to the first gear 51 can be set according to actual needs. The first gear 51 and the second gear 52 can be directly meshed, or another gear can be provided between the first gear 51 and the second gear 52.

[0117] For example, see Figure 11 and Figure 12 The transmission assembly 50 also includes a fourth gear 54, which is located between the first gear 51 and the second gear 52. The fourth gear 54 is a duplex gear, comprising an outer gear 541 and an inner gear 542. The outer gear 541 and the inner gear 542 rotate coaxially, resulting in equal rotational speeds for the outer gear 541 and the inner gear 542. The inner gear 542 directly meshes with the first gear 51, and the gear ratio between the first gear 51 and the inner gear 542 is less than 1. This results in a smaller reference circle diameter for the first gear 51 than for the inner gear 542, and a higher rotational speed for the first gear 51 than for the inner gear 542, thus achieving speed reduction during the transmission process from the first gear 51 to the inner gear 542. The outer gear 541 directly meshes with the second gear 52, and the gear ratio between the outer gear 541 and the inner gear 542 is less than 1. This results in a smaller reference circle diameter for the outer gear 541 than for the second gear 52, and a higher rotational speed for the outer gear 541 than for the second gear 52. Since the rotational speed of the outer gear 541 is equal to the rotational speed of the inner gear 542, that is, the rotational speed of the inner gear 542 is greater than the rotational speed of the second gear 52, and since the rotational speed of the first gear 51 is greater than the rotational speed of the inner gear 542, the rotational speed of the first gear 51 is greater than the rotational speed of the second gear 52, thereby achieving deceleration in the transmission process from the first gear 51 to the second gear 52.

[0118] For a possible implementation, see Figure 7 、 Figure 8 and Figure 13 , Figure 13The schematic diagram of the structure of the drive assembly 40 provided in an embodiment of the present application is shown. The drive assembly 40 includes an input shaft 41, one end of which is connected to a first gear 51. The rotation of the input shaft 41 drives the first gear 51 to rotate, and the kinetic energy of the rotation is transmitted to the screw rod 10 through the transmission assembly 50, so that the input shaft 41 of the drive assembly 40 drives the screw rod 10 to rotate.

[0119] The input shaft 41 and the screw rod 10 are parallel, making the structural arrangement of the input shaft 41 and the screw rod 10 more regular, which is conducive to the miniaturization of the telescopic structure 100 and reducing the friction between the connection between the input shaft 41 and the transmission assembly 50 and the connection between the screw rod 10 and the transmission assembly 50, ensuring good kinetic energy transmission efficiency between the input shaft 41 and the transmission assembly 50, and between the transmission assembly 50 and the screw rod 10, thereby improving the driving efficiency of the drive assembly 40 in rotating the screw rod 10. For further information, please refer to Figure 7 The input shaft 41 and the screw rod 10 are located on the same side of the transmission assembly 50 , which is beneficial to reducing the length of the telescopic structure 100 in the extending direction of the screw rod 10 and realizing the miniaturization of the telescopic structure 100 .

[0120] For example, see Figure 7 , the input shaft 41 and the screw rod 10 are both along the second direction (such as Figure 7 The input shaft 41 and the screw rod 10 are parallel, and at least two gears in the transmission assembly 50 are arranged in the first direction (as shown in the Y direction). Figure 7 The second direction is perpendicular to the first direction, and the input shaft 41 and the lead screw 10 are located on the same side of at least two gears in the second direction, so that the structure of the drive assembly 40, the transmission assembly 50 and the lead screw 10 is folded, ensuring the regularity of the structural arrangement of the drive assembly 40, the transmission assembly 50 and the lead screw 10, which is conducive to simplifying the assembly process of the telescopic structure 100 and realizing the miniaturization of the telescopic structure 100.

[0121] The other end of the input shaft 41 away from the first gear 51 can be connected to the manual drive structure, or the other end of the input shaft 41 away from the first gear 51 can be connected to the electric drive structure, so that the drive assembly 40 can adopt the manual drive mode or the electric drive mode to drive the screw 10 to rotate. It can be understood that the other end of the input shaft 41 away from the first gear 51 can also be connected to the manual drive structure and the electric drive mode at the same time, so that the drive assembly 40 can adopt a mode of combining manual drive and electric drive, and the electric drive structure can assist the manual drive structure in assisting the rotation of the screw 10, so as to reduce the force required in the manual drive process and maintain the good controllability in the manual drive process. Figures 7 to 27 In the illustrated embodiment, the manual drive structure and the electric drive structure of the drive assembly 40 are described in detail.

[0122] For a possible implementation, see Figure 13 and Figure 14 , Figure 14 Shown Figure 13 The exploded view of the drive assembly 40 in the embodiment shown in FIG. 4 shows the drive assembly 40, which further includes a torsion bar 42 and a knob 43. Figure 15 , Figure 15 A structural schematic diagram of the input shaft 41, torsion bar 42 and knob 43 provided in an embodiment of the present application is shown. The two ends of the torsion bar 42 are respectively connected to the knob 43 and the input shaft 41. Manually rotating the knob 43 can drive the torsion bar 42 to rotate, and then drive the input shaft 41 to rotate, thereby realizing manual drive of the drive assembly 40.

[0123] The torsion bar 42 and the knob 43 are fixedly connected, so that the connection between the knob 43 and the torsion bar 42 has good stability, which prevents the knob 43 from falling off from the torsion bar 42 and helps to ensure that the knob 43 can drive the torsion bar 42 to rotate.

[0124] The torsion bar 42 and the input shaft 41 are connected in a coordinated manner. Figure 15 、 Figure 16 and Figure 17 , Figure 16 : shows a schematic structural diagram of the torsion bar 42 provided in an embodiment of the present application, Figure 17 Shown Figure 16 A top view of the torsion bar 42 in the illustrated embodiment. The end of the torsion bar 42 connected to the input shaft 41 has an inner channel 421. The inner channel 421 extends in the same direction as the torsion bar 42, and its length is less than or equal to the length of the torsion bar 42. This prevents the inner channel 421 from being excessively long, which helps ensure the mechanical strength of the torsion bar 42. The end of the input shaft 41 away from the first gear 51 is inserted into the inner channel 421, so that a portion of the input shaft 41 is located within the inner channel 421 of the torsion bar 42. This portion of the input shaft 41 abuts against the inner wall of the inner channel 421, which limits the input shaft 41 in a direction perpendicular to the extension direction of the torsion bar 42, ensuring a mating connection between the input shaft 41 and the torsion bar 42. The rotation direction of the torsion bar 42 is also perpendicular to the extension direction of the torsion bar 42, so that the inner wall of the inner channel 421 can push the input shaft 41 to rotate when the torsion bar 42 rotates, ensuring that the torsion bar 42 can drive the input shaft 41 to rotate, which is conducive to simplifying the matching connection structure of the input shaft 41 and the torsion bar 42, and thus simplifying the assembly process of the input shaft 41 and the torsion bar 42.

[0125] Also, see Figure 15Because a portion of the input shaft 41 is located within the inner channel 421 of the torsion bar 42, the length of the input shaft 41 and the torsion bar 42 partially overlap, which helps reduce the total length of the input shaft 41 and the torsion bar 42, thereby miniaturizing the drive assembly 40. The drive assembly 40 includes two matingly connected components, the input shaft 41 and the torsion bar 42, allowing the torsion bar 42 to move relative to the input shaft 41 in its extension direction. By changing the relative position of the torsion bar 42 and the input shaft 41, the total length of the torsion bar 42 and the input shaft 41 in the extension direction of the torsion bar 42 is adjusted, making the setting position of the knob 43 convenient for manual rotation and distributing the torque between the input shaft 41 and the torsion bar 42. This helps to increase the service life of the input shaft 41 and avoids the need for a longer input shaft 41, which would cause the input shaft 41 to be easily bent due to excessive torque.

[0126] It will be appreciated that when the torsion bar 42 moves relative to the input shaft 41 in its extending direction, a portion of the input shaft 41 is always located within the inner channel 421, maintaining the mating connection between the torsion bar 42 and the input shaft 41. The torsion bar 42 pushes the input shaft 41 against the inner wall of the inner channel 421 to rotate the input shaft 41. Therefore, when a portion of the input shaft 41 is located within the inner channel 421, this portion of the input shaft 41 is in contact with the inner wall of the inner channel 421, enabling the torsion bar 42 to drive the input shaft 41 to rotate.

[0127] In one embodiment, see Figure 15 The input shaft 41 and the torsion bar 42 both extend in the second direction. The torsion bar 42 is sleeved around the outer circumference of the input shaft 41, resulting in a radial length of the torsion bar 42 greater than the radial length of the input shaft 41, ensuring good structural strength for the torsion bar 42. The central axes of the input shaft 41 and the torsion bar 42 coincide, ensuring good coaxiality between the input shaft 41 and the torsion bar 42, which helps ensure good kinetic energy transfer efficiency between the torsion bar 42 and the input shaft 41.

[0128] In one embodiment, see Figure 18 、 Figure 19 and Figure 20 , Figure 18 : shows a schematic structural diagram of a torsion bar 42 with a limiting groove 422 provided in an embodiment of the present application, Figure 19 Shown Figure 18 A top view of the torsion bar 42 in the illustrated embodiment, Figure 20 Shown Figure 18A top view of the connection between the torsion bar 42 and the input shaft 41 in the illustrated embodiment. The inner wall of the inner channel 421 has a limiting groove 422, which connects the limiting groove 422 to the inner channel 421. The limiting groove 422 expands the space of the inner channel 421, which helps increase the contact area between the input shaft 41 and the torsion bar 42, thereby improving the stability of the mating connection between the input shaft 41 and the torsion bar 42. When the end of the input shaft 41 away from the first gear 51 is connected to the torsion bar 42, the end of the input shaft 41 away from the first gear 51 is partially located within the inner channel 421, while the other part is located within the limiting groove 422. The portion of the input shaft 41 located within the limiting groove 422 contacts the inner wall of the limiting groove 422, causing a portion of the input shaft 41 to engage with the limiting groove 422, further improving the stability of the mating connection between the input shaft 41 and the torsion bar 42.

[0129] For example, see Figure 20 The input shaft 41 includes a main body 411 and a protrusion 412 connected at one end away from the first gear 51. The protrusion 412 protrudes from the main body 411 in a direction perpendicular to the axial direction of the input shaft 41. The main body 411 of the input shaft 41 is located within the inner channel 421, and the protrusion 412 is located within the retaining groove 422. The protrusion 412 and the retaining groove 422 engage to achieve a mating connection between the input shaft 41 and the torsion bar 42. The size of the inner channel 421 can be greater than or equal to that of the main body 411, so that the inner channel 421 can provide a larger accommodation space, thereby simplifying the assembly process of the input shaft 41 and the torsion bar 42. The size and shape of the protrusion 412 and the limiting groove 422 can be set according to actual needs to ensure the stability of the engagement between the protrusion 412 and the limiting groove 422. The limiting groove 422 can have an opening at the end of the torsion bar 42 close to the first gear 51, so that the protrusion 412 can enter the limiting groove 422 from the opening, thereby simplifying the assembly process of the input shaft 41 and the torsion bar 42.

[0130] When the torsion bar 42 has both an inner channel 421 and a limiting groove 422 , the input shaft 41 may mainly contact the inner wall of the limiting groove 422 , or the input shaft 41 may mainly contact the inner wall of the inner channel 421 . The following two embodiments will illustrate the above two situations respectively.

[0131] In one embodiment, see Figure 18 、 Figure 19 and Figure 20The input shaft 41 is mainly in contact with the inner wall of the limiting groove 422. By engaging the input shaft 41 with the limiting groove 422, the input shaft 41 and the torsion bar 42 are connected in a coordinated manner. The extension direction of the inner channel 421 and the extension direction of the limiting groove 422 are both the same as the extension direction of the torsion bar 42. The extension length of the inner channel 421 and the extension length of the limiting groove 422 can be the same, or they can be different. When the extension length of the inner channel 421 and the extension length of the limiting groove 422 are the same, the end of the input shaft 41 away from the first gear 51 is connected to the torsion bar 42. Part of the input shaft 41 is always located in the inner channel 421, and the other part is always located in the inner channel 421. The input shaft 41 is always located in the limiting groove 422, ensuring the utilization of the input shaft 41 in the inner channel 421 and the limiting groove 422. When the extension length of the inner channel 421 is different from the extension length of the limiting groove 422, the length of the portion of the input shaft 41 located in the inner channel 421 is different from the length of the other portion of the input shaft 41 located in the limiting groove 422. The shape of the end of the input shaft 41 away from the first gear 51 can be adjusted according to actual needs to improve the applicability of the input shaft 41 to different application scenarios. Figure 19 The inner channel 421 has a first side wall 4211 and a second side wall 4212 opposite to each other in a direction perpendicular to the extension direction of the torsion bar 42. The limiting groove 422 has a third side wall 4221 and a fourth side wall 4222 opposite to each other in a direction perpendicular to the extension direction of the torsion bar 42. The first side wall 4211 and the third side wall 4221 are connected, and the second side wall 4212 and the fourth side wall 4222 are connected. Figure 20 When the end of the input shaft 41 away from the first gear 51 is connected to the torsion bar 42, the input shaft 41 only contacts the third side wall 4221, the fourth side wall 4222 and the bottom wall of the limiting groove 422. The input shaft 41 is spaced apart from the first side wall 4211 and the second side wall 4212, so that the input shaft 41 and the torsion bar 42 can be matched and connected only by adjusting the limiting groove 422, which is conducive to simplifying the setting process of the matching connection between the input shaft 41 and the torsion bar 42.

[0132] In one embodiment, see Figure 16 and Figure 17The input shaft 41 is mainly in contact with the inner wall of the inner channel 421. By engaging the input shaft 41 and the inner channel 421, the input shaft 41 and the torsion bar 42 are matched and connected. At this time, a limiting groove 422 can be provided on the inner wall of the inner channel 421 to expand the space of the inner channel 421 and increase the contact area and connection stability between the input shaft 41 and the torsion bar 42. Alternatively, the inner wall of the inner channel 421 may not be provided with a limiting groove 422, which is beneficial for simplifying the arrangement of the inner channel 421 and the input shaft 41, ensuring the wall thickness of the torsion bar 42, and thus ensuring the mechanical strength of the torsion bar 42. The torsion bar 42 includes an abutment portion 423 and an extension portion 424. The abutment portion 423 is connected to one end of the extension portion 424. The extension portion 424 has one end of the abutment portion 423 for connecting to the input shaft 41, and the other end of the extension portion 424 away from the abutment portion 423 for connecting to the knob 43. Please refer to Figure 16 、 Figure 17 and Figure 21 , Figure 21 Shown Figure 16 In the cross-sectional view of the torsion bar 42 at CC in the illustrated embodiment, the central axes of the abutment portion 423 and the extension portion 424 coincide with each other, and the inner channel 421 passes through both the abutment portion 423 and a portion of the extension portion 424 along the extension direction of the torsion bar 42. The inner channel 421 has a first side wall 4211 and a second side wall 4212 opposite to each other in a direction perpendicular to the extension direction of the torsion bar 42. The first side wall 4211 and the second side wall 4212 are distributed at both the abutment portion 423 and the extension portion 424. Figure 22 , Figure 22 Shown Figure 15 In the illustrated embodiment, a cross-sectional view of the input shaft 41, the torsion bar 42, and the knob 43 at point BB shows that when the input shaft 41 is connected to the torsion bar 42 at one end away from the first gear 51, the input shaft 41 is clamped between the first side wall 4211 and the second side wall 4212. The input shaft 41 is in contact with both the first side wall 4211 and the second side wall 4212. Both the first side wall 4211 and the second side wall 4212 have a large area, which is conducive to ensuring the contact area between the input shaft 41 and the torsion bar 42, thereby ensuring the stability of the mating connection between the input shaft 41 and the torsion bar 42.

[0133] In this embodiment, for example, see Figure 17 and Figure 21 The first side wall 4211 and the second side wall 4212 are two parallel planes, which helps increase the friction between the first side wall 4211 and the second side wall 4212 and the input shaft 41, making it easier for the torsion bar 42 to drive the input shaft 41 to rotate. If both the first side wall 4211 and the second side wall 4212 are curved surfaces, the friction between the first side wall 4211 and the second side wall 4212 and the input shaft 41 is low, which can easily lead to the torsion bar 42 being unable to drive the input shaft 41 to rotate.

[0134] In this embodiment, for example, please read Figure 16 and Figure 21 The outer diameter of the abutment portion 423 is greater than the outer diameter of the extension portion 424. In the extension direction of the torsion bar 42, the extension length of the abutment portion 423 is less than the extension length of the extension portion 424. This results in a smaller outer diameter for the main portion of the torsion bar 42, facilitating the miniaturization of the torsion bar 42, providing space for the installation of other components in the telescopic structure 100, and further miniaturizing the telescopic structure 100. The inner channel 421 extends through both the abutment portion 423 and a portion of the extension portion 424 along the extension direction of the torsion bar 42. Because the outer diameter of the abutment portion 423 is greater than that of the extension portion 424, the inner channel 421 extends through a portion of the surface of the extension portion 424, but does not extend through the surface of the abutment portion 423. The fact that the inner channel 421 does not extend through the surface of the abutment portion 423 helps ensure the structural strength of the torsion bar 42 at the end connected to the input shaft 41. The inner channel 421 penetrates a portion of the surface of the extension portion 424, so that the extension portion 424 has a first opening 425 and a second opening 426 opposite to each other in a direction perpendicular to the extension direction of the torsion bar 42. Figure 15 When the end of the input shaft 41 away from the first gear 51 is connected to the torsion bar 42, the depth of the input shaft 41 in the inner channel 421 can be observed from the first opening 425 and the second opening 426, which is conducive to simplifying the assembly of the input shaft 41 and the torsion bar 42 and providing more space for the torsion bar 42 to accommodate the input shaft 41.

[0135] In this embodiment, as can be seen from the above, when the input shaft 41 is mainly in contact with the inner wall of the inner channel 421, the inner wall of the inner channel 421 may be provided with a limiting groove 422, or the inner wall of the inner channel 421 may not be provided with a limiting groove 422. For example, see Figure 17 and Figure 21 The inner wall of the inner channel 421 has a limiting groove 422, and the limiting groove 422 is only located at the abutment portion 423. The limiting groove 422 passes through the abutment portion 423 along the extension direction of the torsion bar 42, thereby expanding the space of the inner channel 421 at the abutment portion 423, which is beneficial to increasing the contact area between the input shaft 41 and the torsion bar 42, and ensuring the stability of the relative position of the torsion bar 42 and the input shaft 41. Figure 21The inner wall of the inner channel 421 has two relative limiting grooves 422 in a direction perpendicular to the extension direction of the torsion bar 42. The two limiting grooves 422 are respectively arranged opposite to the first opening 425 and the second opening 426, so that when the input shaft 41 is connected to the torsion bar 42 at one end away from the first gear 51, the edge portion of the input shaft 41 is located in the limiting groove 422, and the other portion protrudes from the first opening 425 and the second opening 426, which is beneficial to increasing the contact area between the input shaft 41 and the torsion bar 42, and is also beneficial to improving the fault tolerance of the input shaft 41 and the torsion bar 42 in the matching structure through the limiting groove 422, the first opening 425 and the second opening 426, so that even if there is a slight error in the size of the input shaft 41, it can still be matched with the torsion bar 42.

[0136] For a possible implementation, see Figure 14 、 Figure 15 and Figure 23 , Figure 23 A schematic diagram of the structure of the limiting ring 44, input shaft 41, torsion bar 42, and knob 43, showing the limiting ring 44 and torsion bar 42 in contact, according to an embodiment of the present application, is shown. The drive assembly 40 further includes a limiting ring 44 disposed around the input shaft 41 so that the limiting ring 44 is positioned between the two ends of the input shaft 41 in its extension direction. A distance is provided between the inner wall of the limiting ring 44 and the surface of the input shaft 41, thereby preventing the limiting ring 44 from interfering with the normal rotation of the input shaft 41 and enabling the limiting ring 44 to limit the radial position of the input shaft 41, thereby ensuring the positional stability of the central axis of the input shaft 41 and, in turn, ensuring the stability of the kinetic energy transmission from the drive assembly 40 to the transmission assembly 50.

[0137] See also Figure 7 、 Figure 13 、 Figure 23 and Figure 24 , Figure 24 The schematic diagram of the structure of the limiting ring 44, input shaft 41, torsion bar 42 and knob 43 provided in the embodiment of the present application is shown in a spaced state. The input shaft 41 is connected to the first gear 51, so that the input shaft 41 is fixed relative to the transmission assembly 50. The torsion bar 42 is connected to the input shaft 41 in a cooperative manner. The torsion bar 42 can move along its extension direction to change the total length of the torsion bar 42 and the input shaft 41 in the extension direction of the torsion bar 42, that is, the torsion bar 42 can move relative to the input shaft 41. When the torsion bar 42 moves along its extension direction, when the torsion bar 42 moves toward the side close to the first gear 51, please refer to Figure 23 , the overlapping range of the torsion bar 42 and the input shaft 41 increases, and the total length of the torsion bar 42 and the input shaft 41 in the extending direction of the torsion bar 42 decreases; when the torsion bar 42 moves toward the side away from the first gear 51, please refer to Figure 24The overlap between the torsion bar 42 and the input shaft 41 is reduced, and the combined length of the torsion bar 42 and the input shaft 41 in the direction in which the torsion bar 42 extends is increased. When the torsion bar 42 moves along its extension direction, the range of movement of the torsion bar 42 needs to be limited to ensure the structural stability of the drive assembly 40. This prevents the torsion bar 42 from being too close to the first gear 51, which could interfere with the torsion bar 42 and the transmission assembly 50 upon contact. It also prevents the torsion bar 42 from being too far from the first gear 51, which could cause the torsion bar 42 to detach from the input shaft 41.

[0138] The limiting ring 44 is also used to limit the movement range of the torsion bar 42 in its extension direction to prevent the torsion bar 42 from being too close to the first gear 51, which may cause interference between the torsion bar 42 and the transmission assembly 50. Figure 23 and Figure 24 The limiting ring 44 is arranged around the input shaft 41, and the limiting ring 44 is located on the side of the torsion bar 42 close to the first gear 51. The size of the limiting ring 44 needs to be limited to ensure that the end of the torsion bar 42 close to the first gear 51 can contact the limiting ring 44, so that the torsion bar 42 can move toward the side close to the first gear 51 until it reaches the limiting ring 44, avoiding the end of the torsion bar 42 close to the first gear 51 from passing through the limiting ring 44.

[0139] In one embodiment, see Figure 23 and Figure 24 The limiting ring 44 is in the shape of a ring, so that the limiting ring 44 has an inner diameter and an outer diameter. The end of the torsion bar 42 close to the first gear 51 has an inner channel 421, the diameter of the inner wall of the inner channel 421 is the inner diameter of the torsion bar 42, and the diameter of the outer wall of the torsion bar 42 is the outer diameter of the torsion bar 42. The inner diameter of the limiting ring 44 is smaller than the outer diameter of the torsion bar 42, and the outer diameter of the limiting ring 44 is larger than the inner diameter of the torsion bar 42, so that on the plane perpendicular to the extension direction of the torsion bar 42, the orthographic projection of the limiting ring 44 and the orthographic projection of the torsion bar 42 at least partially overlap. When the torsion bar 42 moves toward the end of the input shaft 41 close to the first gear 51, the torsion bar 42 will contact the limiting ring 44, causing the torsion bar 42 to be unable to move further, thereby realizing the limitation of the movement range of the torsion bar 42 by the limiting ring 44.

[0140] In one embodiment, see Figure 7 、 Figure 13 and Figure 23, the torsion bar 42 and the limiting ring 44 are in contact, that is, the distance between the torsion bar 42 and the limiting ring 44 is 0, the end of the input shaft 41 away from the first gear 51 is completely located in the inner channel 421, the length of the input shaft 41 in the inner channel 421 is the largest, and the total length of the torsion bar 42 and the input shaft 41 in the direction of extension of the torsion bar 42 is the smallest. Because the limiting ring 44 is located between the two ends of the input shaft 41 in its extension direction, the torsion bar 42 cannot approach the end of the input shaft 41 near the first gear 51, thereby limiting the movement range of the torsion bar 42 by the limiting ring 44. For example, please refer to Figure 16 and Figure 23 The torsion bar 42 includes an abutment portion 423 and an extension portion 424. The outer diameter of the abutment portion 423 is larger than the outer diameter of the extension portion 424. The inner diameter of the limiting ring 44 is smaller than the outer diameter of the abutment portion 423 of the torsion bar 42. The outer diameter of the limiting ring 44 is larger than the inner diameter of the abutment portion 423 of the torsion bar 42, so that the abutment portion 423 is used to contact the limiting ring 44, and the extension portion 424 can have a smaller outer diameter, which is conducive to the miniaturization of the torsion bar 42, and then the miniaturization of the drive assembly 40.

[0141] In one embodiment, see Figure 7 、 Figure 13 and Figure 24 , Figure 24 A schematic diagram of the structure of the retaining ring 44, input shaft 41, torsion bar 42, and knob 43, shown in a spaced-apart state, is provided in an embodiment of the present application. The torsion bar 42 and retaining ring 44 are spaced apart, i.e., the distance between the torsion bar 42 and retaining ring 44 is greater than zero. The end of the input shaft 41 away from the first gear 51 is partially located within the inner channel 421, reducing the length of the input shaft 41 within the inner channel 421 and increasing the total length of the torsion bar 42 and input shaft 41 in the direction in which the torsion bar 42 extends. To prevent the torsion bar 42 from separating from the input shaft 41, the distance between the torsion bar 42 and retaining ring 44 must be limited. By ensuring that the distance between the torsion bar 42 and retaining ring 44 is less than the length of the end of the input shaft 41 located within the inner channel 421 protruding from the retaining ring 44, a portion of the input shaft 41 is always located within the inner channel 421, thereby maintaining the connection between the input shaft 41 and torsion bar 42 and preventing separation of the torsion bar 42 from the input shaft 41.

[0142] In one embodiment, see Figure 7 、 Figure 12 、 Figure 24 and Figure 30The telescopic structure 100 further includes a housing 70, within which the torsion bar 42 is located. The housing 70 is used to limit the range of movement of the torsion bar 42 in its extension direction, preventing the torsion bar 42 from moving too far from the first gear 51 and potentially detaching from the input shaft 41. When the torsion bar 42 moves away from the first gear 51, it contacts the inner wall of the housing 70, allowing the torsion bar 42 to move closer to the first gear 51 until it reaches the inner wall of the housing 70, thus preventing the torsion bar 42 from detaching from the input shaft 41.

[0143] Depend on Figure 23 and Figure 24 As can be seen from the illustrated embodiment, by switching the torsion bar 42 and the limiting ring 44 between the contact state and the spacing state, and adjusting the spacing distance between the torsion bar 42 and the limiting ring 44, the total length of the torsion bar 42 and the input shaft 41 in the extension direction of the torsion bar 42 can be adjusted, so that the setting position of the knob 43 can be convenient for manual rotation, and the knob 43 does not protrude excessively when not in use.

[0144] In one embodiment, see Figure 23 and Figure 24 When the torsion bar 42 and the limiting ring 44 are in contact or spaced apart, the input shaft 41 and the bottom wall of the inner channel 421 are both spaced apart, that is, the length of the end of the input shaft 41 located in the inner channel 421 protruding from the limiting ring 44 is less than the length of the inner channel 421 in the extension direction of the torsion bar 42, thereby avoiding contact and collision between the input shaft 41 and the bottom wall of the inner channel 421, which is beneficial to improving the service life of the input shaft 41.

[0145] In one embodiment, see Figure 1 、 Figure 13 、 Figure 23 and Figure 28 , Figure 28 Shown Figure 1An exploded view of the telescopic structure 100 in the illustrated embodiment. The transmission assembly 50 includes a gear cover 55 for accommodating at least two gears. The gear cover 55 has an input hole 551 and a mounting slot 552. The mounting slot 552 is located on the outer surface of the gear cover 55, and the input hole 551 is located on the bottom wall of the mounting slot 552. A retaining ring 44 is at least partially located within the mounting slot 552, securing the retaining ring 44 and the gear cover 55 relative to each other. The inner channel of the retaining ring 44 is coaxial with the input hole 551, and the diameter of the inner channel of the retaining ring 44 is greater than or equal to the diameter of the input hole 551. The input hole 551 is coaxial with the first gear 51, and the diameter of the input hole 551 is greater than the diameter of the input shaft 41. The input shaft 41 sequentially passes through the inner channel of the retaining ring 44 and the input hole 551 to connect with the first gear 51. The retaining ring 44 surrounds the input shaft 41, ensuring that the retaining ring 44 retains the input shaft 41 in its radial direction, thereby ensuring the positional stability of the central axis of the input shaft 41. The limiting ring 44 is located outside the gear cover 55, so that the torsion bar 42 can contact the limiting ring 44, ensuring that the limiting ring 44 limits the torsion bar 42 in its axial direction, avoiding interference between the torsion bar 42 and the transmission assembly 50 after contact.

[0146] For a possible implementation, see Figure 13 、 Figure 14 and Figure 25 , Figure 25 Shown Figure 13 The embodiment shown is a cross-sectional view of the drive assembly 40 taken along line AA. The drive assembly 40 further includes a sleeve 45, within which at least a portion of the torsion bar 42 and a portion of the input shaft 41 are positioned, thereby protecting the torsion bar 42 and the input shaft 41. At least a portion of the knob 43 is positioned outside the sleeve 45, allowing the knob 43 to be easily manually rotated.

[0147] The inner walls of the torsion bar 42 and the sleeve 45 are spaced apart to prevent the sleeve 45 from interfering with the normal rotation of the torsion bar 42. At the same time, since the sleeve 45 is arranged around the torsion bar 42, the sleeve 45 limits the radial position of the torsion bar 42, which is beneficial to ensure the position stability of the central axis of the torsion bar 42, and further ensure the stability of the kinetic energy transmission of the drive component 40 to the transmission component 50.

[0148] In one embodiment, see Figure 25When the torsion bar 42 and the retaining ring 44 are in contact, the torsion bar 42 is completely located within the sleeve 45, and the portion of the knob 43 that connects to the torsion bar 42 is also located within the sleeve 45. When the torsion bar 42 and the retaining ring 44 are spaced apart, a portion of the torsion bar 42 extends from the sleeve 45, and the portion of the knob 43 that is located outside the sleeve 45 increases. This causes the main body 411 of the torsion bar 42 to be partially located within the sleeve 45, thereby limiting and protecting the torsion bar 42 through the sleeve 45, while the main body 411 of the knob 43 is partially located outside the sleeve 45, preventing the sleeve 45 from interfering with the operation of the knob 43. A portion of the retaining ring 44 is located within the sleeve 45, and the sleeve 45 and the retaining ring 44 are connected to secure the sleeve 45 and ensure the stability of the sleeve 45's position. A portion of the input shaft 41 is located within the sleeve 45, allowing the input shaft 41 to connect with the torsion bar 42 within the sleeve 45, thereby transferring kinetic energy from the torsion bar 42 to the input shaft 41.

[0149] For a possible implementation, see Figure 14 and Figure 25 The drive assembly 40 further includes an elastic member 46, which is located within the sleeve 45. At least a portion of the elastic member 46 is located between the sleeve 45 and the torsion bar 42. This allows the elastic member 46 to separate the sleeve 45 from the torsion bar 42, thereby maintaining the torsion bar 42 and the inner wall of the sleeve 45 spaced apart and preventing the sleeve 45 from interfering with the normal rotation of the torsion bar 42. Furthermore, the elastic member 46 can deform when subjected to force, so that the arrangement of the elastic member 46 does not interfere with the rotation of the torsion bar 42 and can maintain the relative position of the torsion bar 42 within the sleeve 45, thereby ensuring the positional stability of the central axis of the torsion bar 42.

[0150] The elastic member 46 can be connected to the outer surface of the torsion bar 42 so that the entire elastic member 46 is located between the torsion bar 42 and the sleeve 45, simplifying the arrangement of the elastic member 46. Alternatively, the torsion bar 42 can be provided with a hole for mounting the elastic member 46 so that part of the elastic member 46 is located between the torsion bar 42 and the sleeve 45, and the connection between the elastic member 46 and the torsion bar 42 is located within the hole, which helps to improve the stability of the connection between the elastic member 46 and the torsion bar 42. The elastic members 46 can be evenly distributed around the circumference of the torsion bar 42 so that all four sides of the torsion bar 42 are spaced from the inner wall of the sleeve 45, thereby improving the stability of the elastic member 46 in maintaining the relative position of the torsion bar 42 within the sleeve 45.

[0151] In one embodiment, see Figure 25 and Figure 26 , Figure 26A schematic diagram of the structure of the drive assembly 40 provided in an embodiment of the present application is shown, without the sleeve 45. The torsion bar 42 has a through hole 427 extending through opposite sides of the outer surface of the torsion bar 42. The elastic member 46 is connected to the inner wall of the through hole 427, so that a portion of the elastic member 46 is located within the through hole 427. The portion of the elastic member 46 located within the through hole 427 is connected to the torsion bar 42. The connection between the elastic member 46 and the torsion bar 42 is located on the inner side of the torsion bar 42, which helps to improve the stability of the connection between the elastic member 46 and the torsion bar 42. The through hole 427 has two opposite openings on opposite sides of the torsion bar 42, and part of the elastic member 46 extends from the openings on both sides of the through hole 427, and the part of the elastic member 46 abuts against the inner wall of the sleeve 45, so that part of the elastic member 46 is located between the torsion bar 42 and the inner wall of the sleeve 45, thereby realizing the radial limitation of the torsion bar 42 by the elastic member 46, maintaining the interval setting of the elastic member 46 and the inner wall of the sleeve 45, avoiding the sleeve 45 from interfering with the normal rotation of the torsion bar 42, and ensuring the position stability of the central axis of the torsion bar 42; at the same time, the elastic member 46 is symmetrically distributed in the circumferential direction of the torsion bar 42, which is conducive to further improving the effect of the elastic member 46 on maintaining the position stability of the torsion bar 42.

[0152] In one embodiment, see Figure 27 , Figure 27 The schematic diagram of the structure of the elastic member 46 provided in the embodiment of the present application is shown. The elastic member 46 includes a fixing portion 461, a connecting shaft 462 and an elastic portion 463. The fixing portion 461 is located in the through hole 427, and the fixing portion 461 and the two opposite inner walls of the through hole 427 are in contact, so that the fixing portion 461 is clamped in the through hole 427, which is conducive to improving the stability of the setting position of the fixing portion 461. The connecting shaft 462 passes through the fixing portion 461 and the torsion bar 42 at the same time, further improving the connection stability of the fixing portion 461 and the torsion bar 42. The elastic portion 463 is connected to the fixing portion 461, and the elastic portion 463 is elastic. The elastic portion 463 includes two curved sections, which extend from two openings on both sides of the through hole 427 respectively, and the two curved sections abut against the inner wall of the sleeve 45 to realize the limiting function of the elastic member 46 on the torsion bar 42, thereby ensuring the position stability of the central axis of the torsion bar 42. The two curved sections are both arc-shaped and protrude from the torsion bar 42 toward the inner wall of the sleeve 45 to reduce the friction between the curved sections and the inner wall of the sleeve 45, avoid the setting of the elastic member 46 interfering with the normal rotation of the torsion bar 42 and the movement of the torsion bar 42 in its extension direction, and improve the service life of the elastic member 46.

[0153] For a possible implementation, see Figure 1 and Figure 11The drive assembly 40 includes a motor 47, which can be directly connected to the screw rod 10 so that the motor 47 directly drives the screw rod 10 to rotate, thereby improving the driving efficiency of the motor 47 on the screw rod 10; the motor 47 can also be connected to the input shaft 41, so that the motor 47 drives the input shaft 41 to rotate, and drives the screw rod 10 to rotate through the transmission assembly 50, which is conducive to adjusting the driving efficiency of the motor 47 on the screw rod 10 through the transmission assembly 50. It is understandable that the motor 47 and manual operation can be used to drive the screw rod 10 to rotate simultaneously, or the motor 47 or manual operation can be used alone to drive the screw rod 10 to rotate, and this application does not impose any restrictions on this.

[0154] For a possible implementation, see Figure 1 and Figure 28 , Figure 28 Shown Figure 1 An exploded view of the telescopic structure 100 in the illustrated embodiment. The telescopic structure 100 further includes a bracket 60, with at least a portion of the moving member 20 positioned between the screw 10 and the bracket 60. This allows the bracket 60 to limit the position of the moving member 20, thereby improving the stability of the moving member 20 during movement along the screw 10. The length of the bracket 60 is greater than or equal to the length of the screw 10, ensuring that the bracket 60 can consistently limit the position of the moving member 20 during movement along the screw 10, further ensuring the stability of the movement of the moving member 20.

[0155] In one embodiment, see Figure 1 The bracket 60 includes a base 61 and a support rod 62. The support rod 62 and the screw rod 10 are both connected to the base 61 to achieve fixed positions of the support rod 62 and the screw rod 10. At the same time, the support rod 62 is parallel to the screw rod 10, and the support rod 62 and the screw rod 10 have a certain spacing distance in a direction perpendicular to the extension direction of the screw rod 10, so that at least part of the moving part 20 can be located between the support rod 62 and the screw rod 10, achieving the limiting effect of the support rod 62 on the moving part 20. The support rod 62 can have a certain spacing distance with the moving part 20 in a direction perpendicular to the extension direction of the screw rod 10 to avoid contact between the screw rod 10 and the moving part 20, resulting in the movement of the moving part 20 along the screw rod 10 being affected; the moving part 20 can also be sleeved on the outer periphery of the support rod 62, so that the moving part 20 moves along the screw rod 10 and the support rod 62 at the same time.

[0156] In one embodiment, see Figure 1 and Figure 29 , Figure 29The structural diagram of the moving part 20 provided by the embodiment of the present application is shown. The moving part 20 includes a mounting hole 211 and a limiting hole 212. The mounting hole 211 is a threaded hole. The screw rod 10 passes through the mounting hole 211, so that the screw rod 10 and the moving part 20 are matched and connected; the inner wall of the limiting hole 212 is a smooth curved surface. The support rod 62 passes through the limiting hole 212, so that the friction between the moving part 20 and the support rod 62 is small, which is conducive to ensuring that the moving part 20 moves along the screw rod 10. When the support rod 62 passes through the moving part 20, it can not only realize the limiting of the moving part 20 in the direction from the screw rod 10 to the support rod 62 by the support rod 62, ensuring the stability of the moving process of the moving part 20, but also prevent the moving part 20 from rotating as the screw rod 10 rotates, which is conducive to ensuring that the moving part 20 can smoothly move along the extension direction of the screw rod 10.

[0157] For a possible implementation, see Figure 30 and Figure 31 , Figure 30 : shows a schematic structural diagram of a telescopic structure 100 provided with a lower cover 71 according to an embodiment of the present application. Figure 31 The telescopic structure 100 provided in an embodiment of the present application is shown as a schematic structural diagram of a housing 70. The telescopic structure 100 further includes the housing 70, and the screw rod 10, the moving member 20, the telescopic portion 30, and the drive assembly 40 are all located within the housing 70, so that the housing 70 can protect the above-mentioned structures.

[0158] In one embodiment, see Figure 31 The housing 70 includes a detachably connected upper cover 72 and a lower cover 71, see Figure 30 , the screw rod 10, the bracket 60 and the drive assembly 40 are all along the second direction (such as Figure 30 and Figure 31 The screw rod 10, the bracket 60 and the drive assembly 40 are connected and fixed at one end in the second direction to one of the inner surfaces of the lower cover 71 in the second direction, the screw rod 10, the bracket 60 and the drive assembly 40 are connected at the other end in the second direction to the transmission assembly 50, and the transmission assembly 50 is connected and fixed to the other inner surface of the lower cover 71 in the second direction, so as to achieve the position fixation of the screw rod 10, the bracket 60, the drive assembly 40 and the transmission assembly 50 in the lower cover 71. The knob 43 of the drive assembly 40 is located on the outside of the lower cover 71 so that the setting position of the knob 43 is convenient for manual rotation. The screw rod 10, the bracket 60, the drive assembly 40 and the transmission assembly 50 are basically located in the same direction perpendicular to the third direction (as shown in the Y direction). Figure 30 and Figure 31The telescopic portion 30 is located on a plane extending in the Z direction as shown in the figure, and is located on another plane perpendicular to the third direction, so that the telescopic portion 30 and the screw rod 10, the bracket 60, the drive assembly 40 and the transmission assembly 50 are stacked in the third direction, making the components in the telescopic structure 100 more compact, which is conducive to miniaturization of the telescopic structure 100.

[0159] Illustratively, two inner surfaces of the lower cover 71 that are opposite to each other in the second direction each have a slide groove, so that the telescopic portion 30 and the lower cover 71 are slidably connected, facilitating the movement of the telescopic portion 30 by the movable member 20 in the first direction and ensuring the positional stability of the telescopic portion 30 during movement. The telescopic portion 30 has a groove in the portion that is opposite to the screw rod 10, the bracket 60, the drive assembly 40, and the transmission assembly 50 in the third direction. The groove is used to accommodate the screw rod 10, the bracket 60, the drive assembly 40, and the transmission assembly 50, so that the screw rod 10, the bracket 60, the drive assembly 40, and the transmission assembly 50 are generally located on the same plane perpendicular to the third direction, and the telescopic portion 30 is generally located on another plane perpendicular to the third direction. The telescopic portion 30 is stacked with the screw rod 10, the bracket 60, the drive assembly 40, and the transmission assembly 50 in the third direction, which helps to reduce the thickness of the telescopic structure 100 in the third direction and further achieve miniaturization of the telescopic structure 100. The telescopic part 30 is used to accommodate the screw rod 10, the bracket 60, the driving assembly 40 and the transmission assembly 50. The bottom wall has a through slot 31. Part of the moving part 20 passes through the through slot 31 from the third direction, which is conducive to simplifying the connection method between the telescopic part 30 and the moving part 20.

[0160] This application also provides a fastening structure, see Figure 1 and Figure 32 , Figure 32 A schematic diagram of the structure of a watch 200 provided in an embodiment of the present application is shown. The fastening structure includes a strap and a telescopic structure 100 as described in any of the above embodiments. The strap and telescopic structure 100 are connected so that by adjusting the length of the telescopic structure 100, the total length of the strap and telescopic structure 100 can be adjusted, thereby enabling the fastening structure to be fixed and removed.

[0161] The fastening structure's band and telescopic structure 100 together form a ring-shaped or arc-shaped structure. The fastening structure includes, but is not limited to, a watch 200, headphones, a belt, a helmet, and glasses. For example, when the fastening structure is a watch 200, a belt, or a helmet, the band and telescopic structure 100 together form a ring-shaped structure, and the ring size of the ring structure can be adjusted. When the fastening structure is headphones or glasses, the band and telescopic structure 100 together form an arc-shaped structure, and the length of the arc-shaped structure can be adjusted in the direction of its extension.

[0162] It can be understood that the fastening structure in this embodiment has the telescopic structure 100 in the above embodiment. Therefore, the fastening structure in this embodiment has all the technical effects of the telescopic structure 100 in the above embodiment. Since the technical effects of the telescopic structure 100 have been fully explained in the above embodiment, they will not be repeated here.

[0163] This application also provides a watch 200, see Figure 1 and Figure 32 The watch 200 includes a dial 210, a watchband 220, and the telescopic structure 100 described in any of the aforementioned embodiments. The watchband 220 is connected to the dial 210, and the telescopic structure 100 is connected to the watchband 220, so that the dial 210, watchband 220, and telescopic structure 100 collectively form an annular structure. When the drive assembly 40 of the telescopic structure 100 drives the screw 10 to rotate, the moving member 20 of the telescopic structure 100 moves along the screw 10, driving the telescopic portion 30 of the telescopic structure 100 to move along the annular extension direction of the annular structure, thereby adjusting the annular size of the annular structure.

[0164] In one embodiment, see Figure 1 and Figure 32 The watch strap 220 includes a first strap 221 and a second strap 222, both of which are connected to the dial 210. The telescopic structure 100 is located between the first strap 221 and the second strap 222, so that the dial 210, the first strap 221, the telescopic structure 100, and the second strap 222 form an annular structure. The watch 200 also includes a housing 70 and a butterfly clasp. The main body 411 of the telescopic structure 100 is partially located within the housing 70, and the telescopic portion 30 of the telescopic structure 100 is partially located outside the housing 70. The first strap 221 is connected to the telescopic portion 30, that is, the two ends of the first strap 221 are respectively connected to the dial 210 and the telescopic portion 30, so that the first strap 221 can move with the movement of the telescopic portion 30, thereby achieving precise adjustment of the ring size of the annular structure. The butterfly clasp is located outside the housing 70. One end of the clasp is connected to the outer surface of the housing 70, and the other end is connected to the second strap 222. Specifically, the two ends of the second strap 222 are connected to the dial 210 and the butterfly clasp, respectively. When the butterfly clasp is unfolded, the dial 210, the first strap 221, the telescopic structure 100, the butterfly clasp, and the second strap 222 form a larger annular structure, thereby enabling a wide range of adjustment of the annular structure's size. When the butterfly clasp is folded, the butterfly clasp overlaps the telescopic structure 100, ensuring the telescopic structure's ability to adjust the annular structure's size.

[0165] In one embodiment, see Figure 33 , Figure 33A system schematic diagram of a watch 200 provided in an embodiment of the present application is shown. The watch 200 also includes a pressure sensor 230, which is electrically connected to the drive assembly 40 of the telescopic structure 100. The pressure sensor 230 is used to detect the restraint pressure of the watch 200 and transmit the detected pressure value to the drive assembly 40. The drive assembly 40 is used to adjust the telescopic structure 100 according to the restraint pressure to ensure that the watch 200 has appropriate restraint pressure during wearing, avoid the watch 200 from being too tight or too loose, and improve the comfort during wearing.

[0166] For example, see Figure 33 The watch 200 also includes a controller 240, which is electrically connected to the pressure sensor 230 and the drive assembly 40. The controller 240 stores restraint pressure ranges for different application scenarios. The user inputs instructions for a specific application scenario into the controller 240 based on actual needs. The controller 240 controls the drive assembly 40 to adjust the telescopic structure 100 based on the restraint pressure range for that application scenario. The pressure sensor 230 continuously monitors the pressure in real time during the adjustment process. When the pressure value detected by the pressure sensor 230 reaches the restraint pressure range for that application scenario, the pressure sensor 230 transmits the detected pressure value to the controller 240, which then controls the drive assembly 40 to stop adjusting, completing the entire adjustment process.

[0167] It can be understood that the watch 200 in this embodiment has the telescopic structure 100 in the above embodiment. Therefore, the watch 200 in this embodiment has all the technical effects of the telescopic structure 100 in the above embodiment. Since the technical effects of the telescopic structure 100 have been fully explained in the above embodiment, they will not be repeated here.

[0168] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A telescopic structure, characterized in that: include: A screw rod and a moving part, wherein the screw rod and the moving part are cooperatively connected; The telescopic part and the driving component are connected to the moving part, and the driving component drives the screw rod to rotate so that the moving part moves along the screw rod, and the moving part drives the telescopic part to move along the first direction to adjust the length of the telescopic structure in the first direction.

2. The telescopic structure according to claim 1, characterized in that: The telescopic portion has a through slot, and part of the moving member is located in the through slot and abuts against the inner wall of the through slot.

3. The telescopic structure according to claim 2, characterized in that: The screw rod extends along a second direction, the second direction and the first direction form an included angle, the through slot extends in a direction perpendicular to its depth, and the extending direction of the through slot forms an included angle with both the first direction and the second direction.

4. The telescopic structure according to claim 3, characterized in that: The through slot extends along a straight line.

5. The telescopic structure according to any one of claims 1 to 4, characterized in that: The telescopic structure also includes a transmission assembly, which includes at least two gears meshing in sequence. The at least two gears include a first gear and a second gear. The first gear is connected to the drive assembly, and the second gear is connected to the screw rod. The gear ratio of the second gear to the first gear is less than 1.

6. The telescopic structure according to claim 5, characterized in that: The at least two gears are arranged sequentially in the first direction, and the first gear and the second gear are respectively located at two ends of the at least two gears in the first direction.

7. The telescopic structure according to claim 5, characterized in that: The at least two gears also include a third gear, which is a double gear. The third gear includes an upper gear and a lower gear, and the tooth ratio of the upper gear to the lower gear is less than 1. The upper gear is meshed with the first gear, and the tooth ratio of the upper gear to the first gear is less than 1. The lower gear is meshed with the second gear, and the tooth ratio of the second gear to the lower gear is less than 1.

8. The telescopic structure according to claim 5, characterized in that: The driving assembly includes an input shaft connected to the first gear, the input shaft and the screw rod are parallel, and the input shaft and the screw rod are located on the same side of the transmission assembly.

9. The telescopic structure according to claim 8, characterized in that: The drive assembly also includes a torsion bar and a knob, one end of the torsion bar is connected to the knob, the other end of the torsion bar has an inner channel, the end of the input shaft away from the first gear is located in the inner channel, and the input shaft and the torsion bar are cooperatively connected.

10. The telescopic structure according to claim 9, characterized in that: The inner wall of the inner channel is provided with a limiting groove, and a portion of the input shaft is located in the limiting groove and abuts against the inner wall of the limiting groove.

11. The telescopic structure according to claim 10, characterized in that: The extending direction of the limiting groove is the same as the extending direction of the torsion bar, and the length of the limiting groove is smaller than the length of the torsion bar.

12. The telescopic structure according to any one of claims 9 to 11, characterized in that: The drive assembly also includes a limiting ring, which is arranged around the input shaft. The inner diameter of the limiting ring is smaller than the outer diameter of the torsion bar, and the outer diameter of the limiting ring is larger than the inner diameter of the torsion bar. The input shaft and the bottom wall of the inner channel are spaced apart.

13. The telescopic structure according to claim 12, characterized in that: The torsion bar moves along its extending direction, and the spacing distance between the torsion bar and the limiting ring is less than the length of the end of the input shaft located in the inner channel protruding from the limiting ring.

14. The telescopic structure according to any one of claims 9 to 11 or claim 13, characterized in that: The drive assembly further includes a sleeve, at least part of the torsion bar and part of the input shaft are located in the sleeve, the torsion bar and the inner wall of the sleeve are spaced apart, and at least part of the knob is located outside the sleeve.

15. The telescopic structure according to claim 14, characterized in that: The drive assembly also includes an elastic member, which is located in the sleeve. The torsion bar has a through hole, which passes through opposite sides of the outer surface of the torsion bar. The elastic member is connected to the inner wall of the through hole. Part of the elastic member extends from the openings on both sides of the through hole and abuts against the inner wall of the sleeve.

16. The telescopic structure according to claim 15, characterized in that: The portion of the elastic member extending from the through hole is arc-shaped and protrudes toward the inner wall of the sleeve.

17. The telescopic structure according to any one of claims 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 13, 15, and 16, wherein: The drive assembly includes a motor.

18. The telescopic structure according to any one of claims 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 13, 15, and 16, wherein: The telescopic structure further includes a bracket, the length of the bracket is greater than or equal to the length of the screw rod, and at least part of the moving part is located between the screw rod and the bracket.

19. A fastening structure, characterized in that: It comprises a belt body and the telescopic structure according to any one of claims 1 to 18, wherein the belt body and the telescopic structure are connected, and the belt body and the telescopic structure together form an annular structure or an arc structure.

20. A watch, characterized in that: It comprises a watch dial, a watch strap and the telescopic structure according to any one of claims 1 to 18, wherein the watch strap is connected to the watch dial, and the telescopic structure is connected to the watch strap, and the watch dial, the watch strap and the telescopic structure together enclose an annular structure, and the telescopic structure is used to adjust the circumference of the annular structure.

21. The watch according to claim 20, characterized in that The watch also includes a case and a butterfly clasp. The telescopic structure is located inside the case, and the screw rod of the telescopic structure is connected to the inner surface of the case. The butterfly clasp is located outside the case, and one end of the butterfly clasp is connected to the outer surface of the case. The watch strap includes a first watch strap and a second watch strap. The two ends of the first watch strap are respectively connected to the telescopic part of the telescopic structure and the dial, and the two ends of the second watch strap are respectively connected to the other end of the butterfly clasp and the dial.

22. The watch according to claim 20 or 21, characterized in that The watch also includes a pressure sensor, which is electrically connected to the drive component of the telescopic structure. The pressure sensor is used to detect the restraint pressure of the watch, and the drive component is used to adjust the telescopic structure according to the restraint pressure.

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