Transmission mechanism

Abstract

The present invention provides a transmission mechanism comprising a driving member, a linkage member, a first fixed tube, and a transmission member. The driving member is disposed within the first fixed tube and has an output shaft extending from the first fixed tube. The output shaft is fixedly connected to the transmission member via a linkage member, and the transmission member is sleeved around the outer circumference of the first fixed tube. The transmission mechanism provided by the present invention, by disposing the driving member within the first fixed tube, can shorten the axial length of the transmission mechanism, reduce the space occupied by the transmission mechanism, and fully utilize the internal space of the transmission member and the first fixed tube in the transmission mechanism, thereby miniaturizing the transmission mechanism and making it easier to design the structure. Furthermore, the transmission member and the first fixed tube protect the driving member, preventing it from colliding with other components and providing dust and water resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical transmission, and more specifically, relates to a transmission mechanism. Background Art

[0002] Transmission mechanisms are widely used in the mechanical field and are the core components of mechanical transmissions, providing the main power for the rotation, translation and other movements of the actuator. Transmission mechanisms usually include motors, electric motors, etc. The motors or electric motors directly drive the actuator to move after deceleration and force amplification through the reduction mechanism, or decelerate and amplify the force through the reduction mechanism, and then convert the rotational motion into linear motion through the screw mechanism to drive the actuator to move. This results in the transmission mechanism containing more components, especially when it includes a screw mechanism. The screw mechanism is longer and occupies a larger space. When the transmission mechanism is applied to the field of micro transmission, it will take up too much space and cannot be miniaturized. It will also make it difficult to arrange other components in space. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a transmission mechanism to solve the technical problem in the prior art that the transmission mechanism occupies a large space.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a transmission mechanism, including a driving member, a linkage member, a first fixed tube and a transmission member, wherein the driving member is arranged inside the first fixed tube, the driving member has an output shaft extending out of the first fixed tube, the output shaft and the transmission member are fixedly connected by the linkage member, and the transmission member is sleeved on the outer periphery of the first fixed tube.

[0005] In one embodiment, a circuit board for controlling the driving member is further provided inside the first fixing tube, and the circuit board is electrically connected to the driving member.

[0006] In one embodiment, the driving component includes a motor and a sensor for detecting and controlling the rotation speed of the motor, and the sensor is electrically connected to the circuit board.

[0007] In one embodiment, the driving member further includes a reduction assembly, and the output shaft and the linkage member are connected via the reduction assembly.

[0008] In one embodiment, the transmission mechanism further includes a first support member and a second support member respectively used to axially limit the two ends of the circuit board, and the motor, the first support member, the circuit board and the second support member are arranged in sequence along the axial direction of the transmission member.

[0009] In one embodiment, one end of the first support member has a first shoulder for supporting the motor, the other end of the first support member has a first slot for limiting one end of the circuit board, and the second support member has a second slot for limiting the other end of the circuit board.

[0010] In one embodiment, the transmission mechanism further includes a second fixing tube, which is disposed in the first fixing tube and is used to fix the circuit board.

[0011] In one embodiment, the transmission mechanism further includes a third fixed tube, and the motor, the second fixed tube and the third fixed tube are sequentially arranged along the axial direction of the transmission member.

[0012] In one embodiment, the transmission member is a sleeve or a screw.

[0013] In one embodiment, the outer circumferential wall of the first fixing tube and the inner circumferential wall of the transmission member are rotatably connected via a bearing.

[0014] The transmission mechanism provided by the present invention has the following advantages: Compared with the prior art, the transmission mechanism of the present invention includes a driving member, a linkage member, a first fixed tube, and a transmission member. The driving member is disposed within the first fixed tube, and the output shaft of the driving member and the transmission member are fixed via the linkage member. The transmission member is sleeved around the outer circumference of the first fixed tube. By locating the driving member within the first fixed tube, the axial length of the transmission mechanism is shortened, reducing the space occupied by the transmission mechanism and fully utilizing the internal space of the transmission member and the first fixed tube, thereby miniaturizing the transmission mechanism and making it easier to design. Furthermore, the transmission member and the first fixed tube protect the driving member, preventing it from colliding with other components and providing dust and water resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A front view of a transmission mechanism provided in one embodiment of the present invention;

[0017] Figure 2 A cross-sectional view of a first transmission mechanism provided by an embodiment of the present invention;

[0018] Figure 3 A cross-sectional view of a second transmission mechanism provided by an embodiment of the present invention;

[0019] Figure 4 A partial cross-sectional view of one end of a driving member of a transmission mechanism provided in an embodiment of the present invention;

[0020] Figure 5 A three-dimensional structural diagram of the internal structure of a first fixing tube provided in an embodiment of the present invention;

[0021] Figure 6 A three-dimensional structural diagram of the first support member provided in an embodiment of the present invention.

[0022] Among them, the reference numerals in the figures are:

[0023] 1-driving member; 11-motor; 12-reduction assembly; 121-reduction end cover; 13-output shaft; 14-linkage member; 15-axial limit member; 16-sensor; 17-circuit board; 2-transmission member; 21-second concave-convex portion; 3-nut; 41-first end cover; 42-second end cover; 61-first fixed tube; 62-second fixed tube; 63-third fixed tube; 64-bearing; 71-first support member; 711-first shoulder; 712-second shoulder; 713-third concave-convex portion; 714-first slot; 72-second support member; 721-third shoulder; 722-fourth shoulder. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0026] It should be understood that the terms "length", "width", "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, and are only for the convenience of describing the present invention 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0028] The transmission mechanism provided by the embodiment of the present invention is now described. Transmission mechanisms are widely used in the field of mechanical transmission to provide a power source for actuators.

[0029] In one embodiment of the present invention, please refer to Figures 1 to 3 The transmission mechanism includes a driving member 1, a linkage member 14, a first fixed tube 61 and a transmission member 2. The driving member 1 can output rotational motion. Specifically, the driving member 1 has an output shaft 13. When the driving member 1 is working, the output shaft 13 rotates. The linkage member 14 is fixed on the output shaft 13 and can rotate with the output shaft 13. The transmission member 2 is fixedly connected to the linkage member 14, that is, the transmission member 2 and the output shaft 13 are fixedly connected through the linkage member 14. The operation of the driving member 1 can drive the transmission member 2 to rotate, and the transmission member 2 is sleeved on the outer periphery of the first fixed tube 61. The rotation axis of the transmission member 2 can be its central axis, that is, the driving member 1 can drive the transmission member 2 to rotate. Among them, the driving member 1 is arranged inside the first fixed tube 61, and one end of the output shaft 13 extends out of the first fixed tube 61, so as to be fixed to the transmission member 2 through the linkage member 14. The linkage member 14 and the transmission member 2 are arranged outside the first fixed tube 61. The driving member 1 is arranged inside the first fixed tube 61, and the transmission member 2 is sleeved on the outer periphery of the first fixed tube 61, hiding the driving member 1 inside the first fixed tube 61. Firstly, the axial length of the transmission mechanism can be shortened, the space occupied by the transmission mechanism can be reduced, and the transmission mechanism can be made more miniaturized. Secondly, the transmission member 2 and the first fixed tube 61 can protect the driving member 1, prevent the driving member 1 from colliding with other structural members, and prevent the driving member 1 from dust accumulation or water ingress.

[0030] The transmission mechanism in the above embodiment includes a driving member 1, a linkage member 14, a first fixed tube 61, and a transmission member 2. The driving member 1 is disposed within the first fixed tube 61, and the output shaft 13 of the driving member 1 and the transmission member 2 are fixed via the linkage member 14. The transmission member 2 is sleeved around the outer circumference of the first fixed tube 61. By locating the driving member 1 within the first fixed tube 61, the axial length of the transmission mechanism is shortened, reducing the space occupied by the transmission mechanism and fully utilizing the internal space of the transmission member 2 and the first fixed tube 61. This miniaturizes the transmission mechanism and makes it easier to design its structure. Furthermore, the transmission member 2 and the first fixed tube 61 protect the driving member 1, preventing it from colliding with other components and providing dust and water resistance.

[0031] Optionally, the transmission member 2 is a sleeve. Alternatively, the transmission member 2 is a screw. In this case, the transmission mechanism may further include a nut 3, the outer periphery of the transmission member 2 having an external thread, that is, the transmission member 2 is a hollow screw, the nut 3 is sleeved on the transmission member 2, and the nut 3 is threadedly connected to the transmission member 2. When the driving member 1 drives the transmission member 2 to rotate, the nut 3 on the transmission member 2 translates along the axial direction 2 of the transmission member, thereby converting the rotational motion output by the driving member 1 into the linear motion of the nut 3. The specific structure of the transmission member 2 is not limited in the present invention, and the above two are merely examples of the transmission member 2.

[0032] In one embodiment of the present invention, see Figure 4 When the transmission member 2 is sleeved on the outer circumference of the first fixed tube 61, since the diameter of the output shaft 13 and the diameter of the transmission member 2 are significantly different, the output shaft 13 and the transmission member 2 are both in contact with the linkage member 14 through the setting of the linkage member 14, thereby achieving a fixed connection.

[0033] As one embodiment of the fixed connection between the linkage member 14 and the output shaft 13, specifically, the linkage member 14 is provided with a center hole, through which the output shaft 13 is disposed, and the outer peripheral wall of the output shaft 13 can be interference-fitted with the inner peripheral wall of the center hole, thereby securing the output shaft 13 and the linkage member 14 to each other. Optionally, a first keyway is provided on the output shaft 13, and a second keyway is provided on the inner wall of the center hole, with a connecting key partially embedded in the first keyway and partially embedded in the second keyway. By providing the connecting key, the output shaft 13 and the linkage member 14 can be limited in the circumferential direction, and the connecting key bears some circumferential shear force, thereby preventing the linkage member 14 and the output shaft 13 from rotating relative to each other in the circumferential direction during prolonged use. Optionally, one end of the output shaft 13 is arranged to pass through the linkage member 14, that is, one end of the output shaft 13 is exposed from the linkage member 14, and an axial limiter 15 is fixed to the end of the output shaft 13. The linkage member 14 is clamped between the axial limiter 15 and the motor 11 of the driver 1, or between the axial limiter 15 and the reduction assembly 12, or between the axial limiter 15 and the shoulder of the output shaft 13, thereby axially limiting the linkage member 14. The exposed end of the output shaft 13 and the axial limiter 15 can be connected by an interference fit, or the exposed end of the output shaft 13 has threads, and the axial limiter 15 is threadedly connected to the exposed end of the output shaft 13.

[0034] As one embodiment of the fixed connection between the linkage member 14 and the transmission member 2, specifically, the linkage member 14 is fixed to the interior of the transmission member 2, and the outer peripheral wall of the linkage member 14 is interference-fitted with the inner peripheral wall of the transmission member 2 to achieve a fixed connection between the linkage member 14 and the transmission member 2, so that when the output shaft 13 of the driving member 1 rotates, the linkage member 14 and the transmission member 2 are driven to rotate synchronously. Alternatively, the outer peripheral wall of the linkage member 14 has a first concave-convex portion, and the inner peripheral wall of the transmission member 2 has a second concave-convex portion 21, and the first concave-convex portion and the second concave-convex portion 21 are embedded in each other, thereby limiting the circumferential relative rotation of the linkage member 14 and the transmission member 2, so that the linkage member 14 and the transmission member 2 always maintain synchronous rotation. The number of the first concave-convex portion is multiple and evenly distributed along the circumference of the linkage member 14, and the number of the second concave-convex portion 21 is multiple and evenly distributed along the circumference of the inner peripheral wall of the transmission member 2. In this way, the outer peripheral wall of the linkage member 14 and the inner peripheral wall of the transmission member 2 are both tooth-shaped, and the two are embedded in each other to prevent circumferential relative rotation. Alternatively, the outer circumferential wall of the linkage member 14 is interference fit with the inner circumferential wall of the transmission member 2, and the outer circumference of the linkage member 14 has a first concave-convex portion, and the inner circumferential wall of the transmission member 2 has a second concave-convex portion 21 that matches the first concave-convex portion.

[0035] As another embodiment of a fixed connection between the linkage member 14 and the transmission member 2, specifically, the linkage member 14 is fixed to the end of the transmission member 2. The linkage member 14 and the transmission member 2 are fixedly connected by a fixing member such as a screw, a rivet, or a pin. Specifically, the linkage member 14 has a first connecting hole, and the end surface of the transmission member 2 has a second connecting hole. The fixing member passes through the first and second connecting holes, thereby fixing the linkage member 14 to the end surface of the transmission member 2.

[0036] When the linkage member 14 is fixed to the interior of the transmission member 2, the end of the transmission member 2 provided with the driver 1 is provided with a first end cap 41, and the other end cap of the transmission member 2 is provided with a second end cap 42. The connection method between the first end cap 41 and the second end cap 42 and the transmission member 2 is not limited herein. When the linkage member 14 is fixed to the end of the transmission member 2, the linkage member 14 can be used as the first end cap 41 described above, and the end of the transmission member 2 away from the driver 1 is provided with the second end cap 42.

[0037] In one embodiment of the present invention, see Figure 2 and Figure 3The transmission mechanism includes a driving member 1, a transmission member 2, a nut 3 and a first fixed tube 61. The driving member 1 drives the transmission member 2 to rotate, and the nut 3 is threadedly connected to the transmission member 2. When the transmission member 2 rotates, the nut 3 translates along the axial direction of the transmission member 2. The first fixed tube 61 is arranged in the transmission member 2, and the driving member 1 is arranged in the first fixed tube 61. Since the driving member 1 is composed of a plurality of components, the first fixed tube 61 is correspondingly provided with a matching structure that matches the driving member 1. If the first fixed tube 61 is not provided, the corresponding matching structure needs to be provided in the transmission member 2, which will cause the manufacturing process of the transmission member 2 to be too complicated and the manufacturing cost to increase sharply.

[0038] When the driver 1 is operating, the transmission member 2 rotates accordingly, while the first fixed tube 61 remains stationary. To ensure the first fixed tube 61 is stably mounted within the transmission member 2, a bearing 64 is disposed between the outer wall of the first fixed tube 61 and the inner wall of the transmission member 2. This allows the transmission member 2 to rotate stably relative to the first fixed tube 61 while also stably supporting the first fixed tube 61 within the transmission member 2. The bearing 64 can be disposed at the ends of the first fixed tube 61 and the transmission member 2 to facilitate its installation. More specifically, the bearing 64 can be disposed at the end of the transmission member 2 away from the driver 1 to avoid interference with the installation of the driver 1. The end of the outer ring of the bearing 64 can extend radially outward to form an annular protrusion. A fastener, such as a screw, can pass through the annular protrusion and threadably connect to the end of the transmission member, thereby securely connecting the outer ring of the bearing 64 to the transmission member 2.

[0039] In one embodiment of the present invention, see Figure 4 A circuit board 17 is disposed within the first fixed tube. This circuit board 17 is electrically connected to the driver 1 and is used to control the start / stop, speed, and other aspects of the driver 1. The circuit board 17 can be fixed to the driver 1, such as the motor 11 of the driver 1, or it can be fixed to the inner wall of the first fixed tube 61.

[0040] In one embodiment of the present invention, see Figure 4, the driving member 1 includes a motor 11 and a sensor 16. The motor 11 can output rotational motion, and the power part in the driving member 1 includes but is not limited to the motor 11. The sensor 16 is used to detect and control the rotation speed of the motor 11, and the circuit board 17 is used to control the switch of the motor 11 and cooperate with the sensor 16 to control the rotation speed of the motor 11. The sensor 16 and the circuit board 17 are electrically connected. The sensor 16 can be optionally a Hall sensor 16. The output end of the motor 11 is fixedly connected to a magnetic ring. The output end of the motor 11 and the magnetic ring rotate synchronously, that is, the rotation speed of the motor 11 is the same as the rotation speed of the magnetic ring. The Hall sensor 16 can obtain the rotation speed of the motor 11 by detecting the rotation speed of the magnetic ring. The rotation speed detected by the Hall sensor 16 can be fed back to the circuit board 17. If it is less than the command speed, the rotation speed of the motor 11 is increased. If it is greater than the command speed, the rotation speed of the motor 11 is reduced, thereby achieving control of the rotation speed of the motor 11.

[0041] Optionally, the drive member 1 further includes a reduction assembly 12 connected to the output end of the motor 11. Power input from the motor 11 is reduced by the reduction assembly 12 to produce a relatively low-speed rotational motion, which in turn rotates the transmission member 2 via a linkage 14. The reduction assembly 12 can be a gear reduction assembly, specifically a planetary gear reducer, a parallel gear reducer, or the like. The output shaft of the reduction assembly 12 serves as the output shaft 13 of the drive member 1.

[0042] Optionally, one end of the reduction assembly 12 includes a reduction end cover 121. When the driver 1 is disposed within the first fixed tube 61, the reduction end cover 121 is disposed over the end of the first fixed tube 61, sealing the end of the first fixed tube 61 and protecting the driver 1 therein. The reduction end cover 121 can be secured to the end of the first fixed tube 61 by means of screws, rivets, pins, or the like.

[0043] Optionally, the sensor 16 and the circuit board 17 are placed outside the motor 11. Since the sensor 16 needs to perform magnetic induction with the magnetic ring on the motor 11 and also needs to be electrically connected to the circuit board 17, the sensor 16 is set between the circuit board 17 and the motor 11, which makes it more convenient to connect the sensor 16 and the circuit board 17, as well as the magnetic induction between the sensor 16 and the magnetic ring of the motor 11.

[0044] In one embodiment of the present invention, see Figure 3 and Figure 5, the interior of the transmission member 2 also has a first support member 71 and a second support member 72. The first support member 71 and the second support member 72 are used to support and position the sensor 16 and the circuit board 17. Specifically, the sensor 16 is fixed on the first support member 71, and the first support member 71 and the second support member 72 are respectively used to axially limit the two ends of the circuit board 17 to prevent the circuit board 17 from axial movement. The fixing method of the sensor 16 and the first support member 71 is not limited here. The sensor 16 can also be fixed to the tail end of the motor 11. In the axial direction of the transmission member 2, the motor 11, the first support member 71, the circuit board 17 and the second support member 72 are arranged in sequence, so that the axial limitation of the circuit board 17 by the first support member 71 and the second support member 72 is realized.

[0045] Optionally, a first fixed tube 61 is disposed within the transmission member 2, and the driving member 1 is disposed within the first fixed tube 61. In this case, the outer circumferential wall of the first support member 71 and the outer circumferential wall of the second support member 72 can abut and cooperate with the inner wall of the first fixed tube 61, thereby circumferentially positioning the first and second support members 71, 72 and preventing them from circumferentially shaking within the first fixed tube 61, thereby preventing shaking of the circuit board 17 and the sensor 16. The outer circumferences of the first and second support members 71, 72 have third concave-convex portions 713, and the inner wall of the first fixed tube 61 has fourth concave-convex portions. The outer walls of the first and second support members 71, 72 both cooperate with the inner wall of the first fixed tube 61 in a concave-convex manner, thereby circumferentially positioning the first and second support members 71, 72 within the first fixed tube 61.

[0046] See also Figure 3 and Figure 6 As one embodiment of the first support member 71 and the second support member 72 respectively limiting the two ends of the circuit board 17 in the axial direction, specifically, the first support member 71 has a first slot 714 at one end facing the circuit board 17, and the second support member 72 has a second slot at one end facing the circuit board 17. The two ends of the circuit board 17 are respectively inserted into the first slot 714 and the second slot, thereby limiting the circuit board 17 in the axial and circumferential directions. Figure 6 The first slot 714 is a sheet-shaped slot, or is composed of two U-shaped slots with two openings facing each other, so that the sheet-shaped circuit board 17 can be adaptively inserted into the first slot 714. The second slot can be the same as the first slot 714 in structure, which is not described here.

[0047] In one embodiment of the present invention, see Figure 3The first support member 71 is disposed between the motor 11 and the circuit board 17. A first shoulder 711 is provided on the end of the first support member 71 facing the motor 11. The end of the motor 11 abuts against the first shoulder 711, thereby fixing the axial position of the first support member 71. The first shoulder 711 can be provided on the inner or outer wall of the first support member 71, and the specific location is not limited here.

[0048] In one embodiment of the present invention, see Figure 3 A second fixing tube 62 is disposed between the first support member 71 and the second support member 72, and the circuit board 17 is disposed within the second fixing tube 62. The second fixing tube 62 protects the circuit board 17 and provides a certain degree of insulation, thereby providing safety for the transmission mechanism. In addition, the first support member 71, the second fixing tube 62, and the second support member 72 are sequentially connected to form a module, which, after completion, is placed into the transmission member 2, making it easier to install, disassemble, and replace. The end of the first support member 71 facing the second fixing tube 62 has a second shoulder 712, or the end of the second fixing tube 62 facing the first support member 71 has a shoulder, so that the first support member 71 and the second fixing tube 62 support each other. The end of the second support member 72 facing the second fixing tube 62 has a third shoulder 721, or the end of the second fixing tube 62 facing the second support member 72 has a shoulder, so that the second fixing tube 62 and the second support member 72 support each other. The first shoulder 711, the second shoulder 712, and the third shoulder 721 are all annular bosses. In other embodiments of the present invention, the first support member 71 and the second fixed tube 62, the second support member 72 and the second fixed tube 62 can also be connected by fixing members such as screws and pins, so that the first support member 71, the second fixed tube 62, the second support member 72, the circuit board 17 and the sensor 16 can be assembled into a module and then installed in the transmission member 2 for easy installation, disassembly and replacement.

[0049] When the first fixed tube 61 is disposed within the transmission member 2, the first support member 71, the second fixed tube 62, and the second support member 72 are all disposed within the first fixed tube 61. The outer contours of the first and second support members 71, 72 match the inner contours of the first fixed tube 61. The second fixed tube 62 is positioned by the first and second support members 71, 72. The outer wall of the second fixed tube 62 does not need to contact the inner wall of the first fixed tube 61, resulting in less friction during installation and facilitating easier installation of the internal structure of the first fixed tube 61. The outer diameter of the second fixed tube 62 is smaller than the inner diameter of the first fixed tube 61, preventing the second fixed tube 62 from contacting the first fixed tube 61.

[0050] Optionally, see Figure 3A third fixing tube 63 is also provided inside the transmission member 2. The length of the transmission member 2 is set according to the required travel range of the transmission mechanism. When the driver 1 is installed inside the transmission member 2, the sum of the axial lengths of the motor 11, the first support member 71, the second fixing tube 62 (which is approximately the same length as the circuit board 17), and the second support member 72 is often less than the length of the transmission member 2. To ensure the axial stability of the first support member 71, the second fixing tube 62, and the second support member 72, the third fixing tube 63 is provided at the end of the second support member 72 facing away from the circuit board 17. This allows the first support member 71, the second fixing tube 62, the second support member 72, and the third fixing tube 63 to abut in sequence along the axial direction of the transmission member 2, thereby filling the vacant space within the transmission member 2. The end of the first support member 71 facing away from the second fixing tube 62 abuts the motor 11, and the end of the third fixing tube 63 facing away from the second support member 72 abuts the second end cap 42 or the base of the transmission mechanism. This creates a stable connection structure within the transmission member 2. The end of the second support member 72 facing the third fixing tube 63 is provided with a fourth shoulder 722 for the third fixing tube 63 to abut against.

[0051] In other embodiments, the transmission mechanism may also include a second fixed tube 62, but not include the first support member 71 and the second support member 72, and the circuit board 17 may be disposed inside the second fixed tube 62. More specifically, the circuit board 17 may be fixed to the inside of the second fixed tube 62 by adhesive or the like, or may be fixed to the inside of the second fixed tube 62 by screws or the like. The transmission mechanism may also include a third fixed tube 63, and the motor 11, the second fixed tube 62, and the third fixed tube 63 are sequentially disposed along the axial direction of the transmission member 2, all disposed inside the first fixed tube 61. The length of the circuit board 17 is fixed, and the second fixed tube 62 is equivalent to the length of the circuit board 17. The third fixed tube is disposed to fill the vacant space inside the first fixed tube 61 to prevent the first and second fixed tubes 61, 62 from axially shaking.

[0052] Optionally, see Figure 3 and Figure 5 The first support member 71 and the second support member 72 are hollow cylindrical. First, they can be adapted to the inner wall of the second fixed tube 62 or the transmission member 2. Second, the heat generated by the circuit board 17 can be quickly dissipated axially within the transmission member 2, further accelerating the speed of heat dissipation and preventing the temperature of the transmission member 2 from being too high.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A transmission mechanism, characterized in that: The invention comprises a driving member, a linkage member, a first fixed tube, and a transmission member, wherein the driving member is arranged inside the first fixed tube, the driving member has an output shaft extending out of the first fixed tube, the output shaft and the transmission member are fixedly connected via the linkage member, the transmission member is sleeved on the outer circumference of the first fixed tube, the outer circumference of the transmission member has an external thread, and a nut is threadedly connected to the transmission member; A circuit board for controlling the driving member is also provided inside the first fixed tube, and the circuit board is electrically connected to the driving member. The driving member includes a motor and a sensor for detecting and controlling the speed of the motor, and the sensor is electrically connected to the circuit board. The transmission mechanism also includes a second fixed tube, which is provided in the first fixed tube and is used to fix the circuit board.

2. The transmission mechanism according to claim 1, wherein: The driving member further includes a reduction assembly, and the output shaft is connected to the linkage member via the reduction assembly.

3. The transmission mechanism according to claim 1, wherein: The transmission mechanism further includes a first support member and a second support member respectively used to axially limit the two ends of the circuit board. The motor, the first support member, the circuit board and the second support member are arranged in sequence along the axial direction of the transmission member.

4. The transmission mechanism according to claim 3, wherein: One end of the first support member has a first shoulder for supporting the motor, the other end of the first support member has a first slot for limiting one end of the circuit board, and the second support member has a second slot for limiting the other end of the circuit board.

5. The transmission mechanism according to claim 1, wherein: The transmission mechanism further includes a third fixed tube, and the motor, the second fixed tube and the third fixed tube are sequentially arranged along the axial direction of the transmission member.

6. The transmission mechanism according to any one of claims 1 to 5, characterized in that: The transmission member is a sleeve or a screw rod.

7. The transmission mechanism according to any one of claims 1 to 5, characterized in that: The outer peripheral wall of the first fixed tube and the inner peripheral wall of the transmission member are rotatably connected via a bearing.

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