Transmission mechanism

Abstract

The present invention relates to a transmission mechanism, which includes: a transmission shaft; an input unit, the input unit includes an input shaft and a transmission disk, the transmission disk is rotatably sleeved on the transmission shaft, the input shaft is in transmission connection with the transmission disk, and the transmission disk rotates around the transmission shaft under the action of the input shaft; a primary transmission unit is located on one side of the axial direction of the transmission disk and is in transmission connection with the transmission disk; a secondary transmission unit is located on the other side of the axial direction of the transmission disk and is in transmission connection with the primary transmission unit; the primary transmission unit outputs a motion that rotates around the axial direction of the transmission shaft at a first rotational speed under the drive of the transmission disk, the secondary transmission unit outputs a motion that rotates around the axial direction of the transmission shaft at a second rotational speed under the drive of the primary transmission unit, and the transmission mechanism can output motions on the relative two sides of the axial direction of the transmission disk respectively, realizing bidirectional output. At the same time, the secondary transmission unit is driven by the primary transmission unit and does not need to be directly driven by the input shaft, and the whole transmission mechanism has a simple structure and occupies a small space.

Description

Technical Field

[0001] The present invention relates to the technical field of reducers, in particular to a transmission mechanism. Background Art

[0002] A reducer is a deceleration power transmission mechanism. There are many types of reducers, among which planetary reducers are the most common. Planetary reducers are equipped with planetary gears inside, and the speed ratio transmission between the power mechanism and the actuator is achieved through the meshing transmission of the sun gear and the planetary gear. However, when the equipment requires different speeds, the traditional planetary gear reducer has a single speed output and cannot meet this requirement. The current planetary gear reducer needs to be replaced, which is time-consuming and labor-intensive, and seriously affects work efficiency.

[0003] In addition, there are also dual-output transmission devices in the prior art, which use two symmetrical reduction mechanisms to reduce speed and output, which is essentially a simple superposition of two reducers. This type of reducer is costly and occupies a large space. Therefore, a traditional reducer capable of bidirectional output is equivalent to the superposition of two unidirectional output reducers, which occupies a large space. Summary of the invention

[0004] Based on this, it is necessary to provide a transmission mechanism to address the problem that traditional bidirectional output reducers occupy a large space.

[0005] A transmission mechanism, comprising:

[0006] transmission shaft;

[0007] An input unit, the input unit comprising an input shaft and a transmission disc, the transmission disc being rotatably sleeved on the transmission shaft, the input shaft being in transmission connection with the transmission disc, and the transmission disc rotating around the transmission shaft under the action of the input shaft;

[0008] a primary transmission unit, the primary transmission unit being located on one side of the transmission disc in an axial direction and being drivingly connected to the transmission disc; and

[0009] A secondary transmission unit, the secondary transmission unit is located on the other side of the transmission disc in the axial direction and is transmission-connected to the primary transmission unit;

[0010] Wherein, the primary transmission unit outputs a motion of axial rotation around the transmission shaft at a first speed driven by the transmission disc, and the secondary transmission unit outputs a motion of axial rotation around the transmission shaft at a second speed driven by the primary transmission unit.

[0011] In the above transmission mechanism, when the input shaft rotates under the drive of the driving mechanism, it can drive the transmission disc to rotate around the transmission shaft, and then drive the primary transmission unit to move through the transmission disc, and output the motion of rotating around the transmission shaft at a first speed on one side of the axial direction of the transmission disc. After that, the secondary transmission unit can be further driven by the primary transmission unit to output the motion of rotating around the transmission shaft at a second speed on the other end of the axial direction of the transmission disc. In this way, the transmission mechanism can output rotational motion on opposite sides of the axial direction of the transmission disc, realize bidirectional output, and replace two driving mechanisms. When the equipment requires different transmission ratios, it can be selected from the two transmission ratios provided by the primary transmission unit and the secondary transmission unit, without the need to replace and assemble a new driving mechanism. At the same time, the secondary transmission unit is driven by the primary transmission unit, and there is no need to directly drive the secondary transmission unit through the input shaft. The entire transmission mechanism has a simple structure and occupies a small space.

[0012] In one embodiment, the first rotational speed is different from the second rotational speed.

[0013] In one embodiment, the primary transmission unit includes a first output member and a first transmission assembly, the first output member is mounted on the transmission shaft, the first transmission assembly is transmission-connected between the transmission disk and the first output member, and the first transmission assembly drives the first output member to rotate at the first speed around the axial direction of the transmission shaft under the action of the transmission disk.

[0014] In one embodiment, the first transmission assembly includes a first planetary gear and a first gear ring, the first planetary gear is rotatably mounted on the axial end surface of the transmission plate, the first gear ring is sleeved outside the first planetary gear and the first output member, and the first planetary gear is meshed between the first gear ring and the first output member;

[0015] The first planetary gear rotates along the circumferential direction of the first gear ring under the drive of the transmission plate, and the first planetary gear rotates around its own axial direction to drive the first output member to rotate around the axial direction of the transmission shaft.

[0016] In one embodiment, the first output member includes a transmission end and an output end connected to each other, the transmission end is meshed with the first planetary gear for transmission, and the output end is arranged on a side of the transmission end facing away from the transmission disc.

[0017] In one embodiment, the secondary transmission unit includes a second transmission component and a second output member, the second transmission component is transmission-connected between the first output member and the second output member, and the second transmission component drives the second output member to rotate at the second speed around the axial direction of the transmission shaft under the action of the first output member.

[0018] In one embodiment, the second transmission assembly includes a second planetary gear, a sun gear, and a second ring gear. The sun gear is sleeved on the transmission shaft and rotates synchronously with the first output member. The second ring gear is sleeved outside the sun gear and the second planetary gear. The second planetary gear meshes between the sun gear and the second ring gear. The second output member is assembled on the second planetary gear.

[0019] Wherein, under the action of the sun gear, the second planetary gear rotates circumferentially along the second ring gear and drives the second output member to rotate synchronously.

[0020] In one embodiment, the transmission shaft has an axially opposite first end and second end. The first end is located at the end where the primary transmission unit is provided, and the second end is located at the end where the secondary transmission unit is provided. The first output member is non-rotatably sleeved on the first end, and the sun gear is non-rotatably sleeved on the second end.

[0021] In one embodiment, the number of the second planetary gears is at least two. Each second planetary gear meshes between the sun gear and the second ring gear. The second output member is sleeved on at least two second planetary gears.

[0022] In one embodiment, the second output member includes a connecting portion and a second output gear. The connecting portion is connected to at least two second planetary gears, and the second output gear is provided on a side of the connecting portion facing away from the second planetary gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a transmission mechanism in an embodiment of the present invention;

[0024] Figure 2 is Figure 1 a cross-sectional schematic diagram of the shown transmission mechanism;

[0025] Figure 3 is Figure 1 an exploded schematic diagram of the shown transmission mechanism.

[0026] 100. Transmission mechanism; 10. Transmission shaft; 12. First end; 14. Second end; 30. Input unit; 32. Input shaft; 34. Transmission disc; 35. First pin shaft; 50. First-stage transmission unit; 52. First output member; 521. Transmission end; 523. Output end; 54. First transmission component; 541. First planetary gear; 543. First ring gear; 70. Second-stage transmission unit; 72. Second transmission component; 721. Second planetary gear; 723. Sun gear; 725. Second ring gear; 74. Second output member; 741. Connection part; 743. Second output gear. Detailed implementation manner

[0027] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following will describe the detailed implementation manner of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0033] Refer to Figures 1 - 3 , in an embodiment of the present invention, a transmission mechanism 100 is provided, which can be connected to a power output member such as a motor to perform power conversion and transmission.

[0034] The transmission mechanism 100 includes a transmission shaft 10, an input unit 30, a primary transmission unit 50 and a secondary transmission unit 70. The input unit 30 includes an input shaft 32 and a transmission disk 34. The transmission disk 34 is rotatably sleeved on the transmission shaft 10. The input shaft 32 is in transmission connection with the transmission disk 34. The transmission disk 34 rotates around the transmission shaft 10 under the action of the input shaft 32. The primary transmission unit 50 is disposed at one end of the transmission disk 34 in the axial direction and is in transmission connection with the transmission disk 34. The secondary transmission unit 70 is located on the other side of the transmission disk 34 in the axial direction and is in transmission connection with the primary transmission unit 50. Wherein, the primary transmission unit 50 outputs a movement rotating around the axis of the transmission shaft 10 at a first rotational speed driven by the transmission disk 34, and the secondary transmission unit 70 outputs a movement rotating around the axis of the transmission shaft 10 at a second rotational speed driven by the primary transmission unit 50.

[0035] When the input shaft 32 rotates under the drive mechanism, it can drive the transmission disc 34 to rotate around the transmission shaft 10, and then drive the primary transmission unit 50 to move through the transmission disc 34, and output the motion of rotating around the transmission shaft 10 at a first speed on one side of the axial direction of the transmission disc 34. After that, the secondary transmission unit 70 can be further driven by the primary transmission unit 50 to output the motion of rotating around the transmission shaft 10 at a second speed on the other end of the axial direction of the transmission disc 34. In this way, the transmission mechanism 100 can output rotational motion on the opposite sides of the axial direction of the transmission disc 34, realize bidirectional output, and replace two driving mechanisms. When the device needs different transmission ratios, it can be selected from the two transmission ratios provided by the primary transmission unit 50 and the secondary transmission unit 70, without replacing and assembling a new driving mechanism. At the same time, the secondary transmission unit 70 is driven by the primary transmission unit 50, and there is no need to directly drive the secondary transmission unit 70 through the input shaft 32. The entire transmission mechanism 100 has a simple structure and occupies less space.

[0036] Optionally, the input unit 30 is a worm gear assembly, the input shaft 32 is a worm, the transmission disc 34 is a worm wheel, and when the worm rotates under the drive of the driving member, the worm wheel can rotate around the transmission shaft 10. In addition, by using the worm gear assembly as the input unit 30, the driving member that cooperates with the worm can be correspondingly arranged near the plane where the worm gear is located, and the driving member cooperates with the middle area of the transmission mechanism 100, and the driving member will not deviate from the middle area of the transmission mechanism 100, which is convenient for assembling the driving member and making the layout of each mechanism more convenient.

[0037] In some embodiments, the magnitude of the first speed is different from the magnitude of the second speed. For example, if the transmission ratio of the secondary transmission unit 70 to the primary transmission unit 50 is less than 1, the second speed is less than the first speed; if the transmission ratio of the secondary transmission unit 70 to the primary transmission unit 50 is greater than 1, the second speed is greater than the first speed. This is equivalent to the transmission mechanism 100 being able to output two rotational motions with different speeds on both sides of the transmission shaft 10 that are axially opposite to each other. When the speed requirement of the system changes, it is only necessary to switch one of the primary transmission unit 50 and the secondary transmission unit 70 to be connected to the subsequent action mechanism for transmission, so as to achieve the switching of different transmission ratios.

[0038] For example, the transmission mechanism 100 is a reducer, the second speed is less than the first speed, and after the primary transmission unit 50 reduces the speed of the driving member by one level to output the first speed, the secondary transmission unit 70 connected to the primary transmission unit 50 performs secondary reduction to output the second speed.

[0039] In addition, when some devices require driving at two different rotational speeds simultaneously, the primary transmission unit 50 and the secondary transmission unit 70 can both be driven. Meanwhile, by reasonably setting the transmission ratio between the primary transmission unit 50 and the secondary transmission unit 70, the speed difference at both ends can be precisely controlled. For example, the motion logic of some products is that two moving parts initially need to move at different speeds, one fast and one slow. After a specified time of movement, either the slower end or the faster end needs to stop, while the other end continues to move. The drive mechanism 100 can achieve the driving of the above-mentioned motion process.

[0040] In some embodiments, the primary transmission unit 50 includes a first output member 52 and a first transmission assembly 54. The first output member 52 is assembled on the transmission shaft 10, and the first transmission assembly 54 is drivingly connected between the transmission disk 34 and the first output member 52. The first transmission assembly 54 drives the first output member 52 to rotate around the axis of the transmission shaft 10 at a first rotational speed under the action of the transmission disk 34. When the transmission disk 34 rotates, it drives the first transmission assembly 54 to move, and further drives the first output member 52 to rotate around the axis of the transmission shaft 10 at a first rotational speed. The motion of rotating around the axis of the transmission shaft 10 at a first rotational speed is output through the first output member 52.

[0041] Further, the first transmission assembly 54 includes a first planetary gear 541 and a first gear ring 543. The first planetary gear 541 is rotatably assembled on the axial end face of the transmission disk 34. The first gear ring 543 is sleeved outside the first planetary gear and the first output member 52. The first planetary gear 541 meshes between the first gear ring 543 and the first output member 52. Among them, the first planetary gear 541 rotates circumferentially along the first gear ring 543 under the drive of the transmission disk 34, and at the same time, the first planetary gear 541 rotates around its own axis to drive the first output member 52 to rotate around the axis of the transmission shaft 10. The first transmission assembly 54 is a planetary gear set. The first planetary gear rotates circumferentially along the first gear ring 543 under the drive of the transmission disk 34, and further drives the first output member 52 to rotate around the axis of the transmission shaft 10 at a first speed. It can be understood that the first gear ring 543, the transmission shaft 10, the transmission disk 34, and the first output member 52 are coaxially arranged, and the first gear ring 543 is fixedly arranged. In this way, when the first planetary mechanism rotates under the drive of the transmission disk 34, it can rotate circumferentially along the fixedly arranged first gear ring 543.

[0042] Optionally, a first pin shaft 35 is provided on the axial end face of the transmission disk 34. The first planetary gear 541 is rotatably sleeved on the first pin shaft 35. The transmission disk 34 drives the first planetary gear 541 to revolve around the axis of the transmission shaft 10 through the first pin shaft 35. At the same time, the first planetary gear 541 rotates around the first pin shaft 35, and further drives the first output member 52 to rotate around the axis of the transmission shaft 10.

[0043] Specifically, the first output member 52 includes a driving end 521 and an output end 523 which are connected to each other. The driving end 521 is in driving connection with the inner core of the first planetary gear 541. The output end 523 is disposed on the side of the driving end 521 facing away from the driving disc 34 and is used for mating with the subsequent actuating mechanism. When the driving end 521 rotates about the axial direction of the transmission shaft 10 under the drive of the first planetary gear 541, the output end 523 rotates synchronously with the driving end 521 to output a rotational motion. Optionally, the driving end 521 and the output end 523 are integrally formed, which is convenient for assembly and torque transmission.

[0044] In some embodiments, the secondary transmission unit 70 includes a second transmission assembly 72 and a second output member 74. The second transmission assembly 72 is drivingly connected between the first output member 52 and the second output member 74. The second transmission assembly 72 drives the second output member 74 to rotate about the axial direction of the transmission shaft 10 at a second rotational speed under the action of the first output member 52. The secondary transmission unit 70 is located on the side of the driving disc 34 facing away from the primary transmission unit 50, and the second transmission assembly 72 moves under the drive of the first output member 52, thereby driving the second output member 74 to rotate about the axial direction of the transmission shaft 10 at the second rotational speed. Thus, the rotational motion can be output through the first output member 52 of the primary transmission unit 50 and the second output member 74 of the secondary transmission unit 70, enabling the transmission mechanism 100 to output bidirectionally.

[0045] Further, the second transmission assembly 72 includes a second planetary gear 721, a sun gear 723, and a second ring gear 725. The sun gear 723 is sleeved on the transmission shaft 10 and rotates synchronously with the first output member 52. The second ring gear 725 is sleeved outside the sun gear and the second planetary gear 721. The second planetary gear 721 meshes between the sun gear 723 and the second ring gear 725. The second output member 74 is assembled on the second planetary gear 721. Wherein, the second planetary gear 721 rotates circumferentially around the second ring gear 725 under the action of the sun gear 723 and drives the second output member 74 to rotate synchronously. When the first output member 52 rotates about the axial direction of the transmission shaft 10, it synchronously drives the sun gear 723 to rotate about the axial direction of the transmission shaft 10, and then drives the second planetary gear 721 to rotate circumferentially around the second ring gear 725, thereby driving the second output member 74 disposed on the second planetary gear 721 to rotate circumferentially around the second ring gear 725 synchronously. And the second ring gear 725 is sleeved outside the sun gear 723 of the transmission shaft 10, and the second ring gear 725 is coaxially arranged with the transmission shaft 10, so that the rotation of the second planetary gear 721 can drive the second output member 74 to rotate about the axial direction of the transmission shaft 10.

[0046] Specifically, the transmission shaft 10 has an axially opposite first end 12 and second end 14. The first end 12 is located at the end provided with the primary transmission unit 50, and the second end 14 is located at the end provided with the secondary transmission unit 70. The first output member 52 is non-rotatably sleeved on the first end 12, and the sun gear 723 is non-rotatably sleeved on the second end 14. Equivalently, the first output member 52 is non-rotatably engaged with the first end 12 and does not move relative to each other. The first end 12 rotates synchronously with the first output member 52, thereby driving the second end 14 and the sun gear 723 that is non-rotatably engaged with the second end 14 to rotate synchronously. In this way, the first output member 52 drives the sun gear 723 to rotate synchronously through the transmission shaft 10, thereby driving the secondary transmission unit 70 to move.

[0047] In some embodiments, the number of the second planetary gears 721 is at least two. Each second planetary gear 721 is engaged between the sun gear 723 and the second ring gear 725. The second output member 74 is sleeved on at least two second planetary gears 721 to support the second output member 74 through at least two second planetary gears 721. The second output member 74 is driven to rotate circumferentially along the second ring gear 725, that is, to rotate around the axis of the transmission shaft 10, by at least two synchronously rotating second planetary gears 721.

[0048] Specifically, the second output member 74 includes a connecting portion 741 and a second output gear 743. The connecting portion 741 is engaged with at least two second planetary gears 721. The second output gear 743 is provided on a side of the connecting portion 741 facing away from the second planetary gears 721 to connect the second output gear 743 and the second planetary gears 721 through the connecting portion 741, so that the second output gear 743 and the second planetary gears 721 rotate around the axis of the transmission shaft 10 together.

[0049] Among them, the second output gear 743 is coaxially arranged with the transmission shaft 10. When the second planetary gears 721 drive the connecting portion 741 to rotate around the axis of the transmission shaft 10, the second output gear 743 can be driven to rotate around the axis of the transmission shaft 10. Optionally, the connecting portion 741 is at least two second pin shafts. Each second pin shaft is sleeved on a second planetary gear 721, and each second planetary gear 721 can rotate around the second pin shaft assembled therewith, and at the same time, each second planetary gear 721 revolves around the axis of the transmission shaft 10, thereby driving at least two second pin shafts and the second output gear 743 to revolve around the axis of the transmission shaft 10.

[0050] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0051] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A transmission mechanism, characterized in that, The transmission mechanism includes: A transmission shaft; An input unit, which includes an input shaft and a transmission disc. The transmission disc is rotatably sleeved on the transmission shaft, the input shaft is in transmission connection with the transmission disc, and the transmission disc rotates around the transmission shaft under the action of the input shaft; A first-stage transmission unit, which is located on one side of the axial direction of the transmission disc and is in transmission connection with the transmission disc; and A second-stage transmission unit, which is located on the other side of the axial direction of the transmission disc and is in transmission connection with the first-stage transmission unit; Wherein, the first-stage transmission unit outputs a motion that rotates around the axial direction of the transmission shaft at a first rotational speed driven by the transmission disc, and the second-stage transmission unit outputs a motion that rotates around the axial direction of the transmission shaft at a second rotational speed driven by the first-stage transmission unit; The first-stage transmission unit includes a first output member and a first transmission assembly. The first output member is assembled on the transmission shaft, and the first transmission assembly is in transmission connection between the transmission disc and the first output member. The first transmission assembly drives the first output member to rotate around the axial direction of the transmission shaft at the first rotational speed under the action of the transmission disc; The second-stage transmission unit includes a second transmission assembly and a second output member. The second transmission assembly is in transmission connection between the first output member and the second output member. The second transmission assembly drives the second output member to rotate around the axial direction of the transmission shaft at the second rotational speed under the action of the first output member through the transmission shaft; The first transmission assembly includes a first planetary gear and a first gear ring. The first planetary gear is rotatably assembled on the axial end face of the transmission disc. The first gear ring is sleeved outside the first planetary gear and the first output member, and the first planetary gear meshes between the first gear ring and the first output member; Wherein, the first planetary gear rotates circumferentially along the first gear ring under the drive of the transmission disc, and at the same time, the first planetary gear rotates around its own axis to drive the first output member to rotate around the axial direction of the transmission shaft.

2. The transmission mechanism according to claim 1, characterized in that The magnitudes of the first rotational speed and the second rotational speed are different.

3. The transmission mechanism according to claim 1, wherein The first output member includes a transmission end and an output end that are connected to each other. The transmission end meshes and transmits with the first planetary gear, and the output end is arranged on the side of the transmission end facing away from the transmission disc.

4. The transmission mechanism according to claim 1 or 2, characterized in that, The second transmission assembly includes a second planetary gear, a sun gear and a second gear ring. The sun gear is sleeved on the transmission shaft and rotates synchronously with the first output member. The second gear ring is sleeved outside the sun gear and the second planetary gear. The second planetary gear meshes between the sun gear and the second gear ring, and the second output member is assembled on the second planetary gear; Wherein, the second planetary gear rotates circumferentially along the second gear ring under the action of the sun gear and drives the second output member to rotate synchronously.

5. The transmission mechanism according to claim 4, wherein The transmission shaft has a first end and a second end that are axially opposite. The first end is located at the end where the primary transmission unit is provided, and the second end is located at the end where the secondary transmission unit is provided. The first output member is non-rotatably sleeved on the first end, and the sun gear is non-rotatably sleeved on the second end.

6. The transmission mechanism according to claim 4, wherein, The number of the second planetary gears is at least two, and each of the second planetary gears meshes between the sun gear and the second toothed ring. The second output member is sleeved on at least two of the second planetary gears.

7. The transmission mechanism according to claim 6, wherein The second output member includes a connecting portion and a second output gear. The connecting portion is engaged with at least two of the second planetary gears, and the second output gear is provided on a side of the connecting portion facing away from the second planetary gears.

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