gimbal

Abstract

This application relates to the field of monitoring equipment technology and provides a pan-tilt unit (PTZ). The PTG includes a central housing with an assembly cavity, a pitch mechanism, a support shaft, and a connecting structure. The pitch mechanism is located in the assembly cavity and includes at least a worm gear housing and a worm gear shaft rotatably connected to the worm gear housing. A deep groove ball bearing is provided between the worm gear shaft and the worm gear housing, and the worm gear shaft is connected to the central housing. The support shaft passes through the assembly cavity and is rotatably connected to the central housing, and an angular contact bearing is provided between the support shaft and the central housing. One end of the connecting structure is rigidly connected to the worm gear shaft, and the other end is rigidly connected to the support shaft. The PTG provided by this application can reduce the axial load on the worm gear bearing, thereby extending its service life and improving the accuracy and reliability of the PTG.

Description

Technical Field

[0001] This application relates to the field of surveillance equipment technology, and in particular to a pan-tilt unit. Background Technology

[0002] The pitch structure of a gimbal typically uses a worm gear transmission mechanism, which means it needs to withstand large torques and high-frequency axial impact loads during transmission, especially the alternating axial loads during the worm gear transmission process.

[0003] In related technologies, shoulders and mating deep groove ball bearings are typically provided at both ends of the pitch axis to absorb axial loads. However, due to the limited axial load capacity and high-frequency impact resistance of deep groove ball bearings, problems such as failure or shoulder breakage still occur after long-term use, affecting the accuracy, reliability, and lifespan of the gimbal. Utility Model Content

[0004] Therefore, it is necessary to provide a gimbal that can reduce the axial load on the worm gear bearing, thereby extending its service life and improving the accuracy and reliability of the gimbal.

[0005] A gimbal includes a central housing with an assembly cavity, a pitch mechanism, a support shaft, and a connecting structure. The pitch mechanism is located in the assembly cavity and includes at least a worm gear housing and a worm gear shaft rotatably connected to the worm gear housing. A deep groove ball bearing is provided between the worm gear shaft and the worm gear housing, and the worm gear shaft is connected to the central housing. The support shaft passes through the assembly cavity and is rotatably connected to the central housing. An angular contact bearing is provided between the support shaft and the central housing. One end of the connecting structure is rigidly connected to the worm gear shaft, and the other end is rigidly connected to the support shaft.

[0006] Understandably, deep groove ball bearings can withstand radial loads and alternating axial loads during the rotation of the worm gear shaft. Because the worm gear shaft is rigidly connected to the support shaft via a connecting structure, it can transfer the axial load it bears to the support shaft, where it is then carried by an angular contact bearing mounted on the support shaft. This reduces the axial load on the worm gear bearing, improves the assembly reliability of the worm gear shaft, extends its service life, and enhances the accuracy and reliability of the gimbal. Furthermore, the rigid connection between the two ends of the connecting structure and the worm gear shaft and support shaft respectively creates a stable mechanical transmission path between them. This not only strengthens the overall rigidity of the gimbal structure but also effectively prevents deformation of the worm gear shaft or support shaft due to excessive axial loads, thus ensuring the stability and accuracy of the gimbal under prolonged, high-intensity use.

[0007] In some embodiments, the angular contact bearings are provided in at least two and spaced apart axially along the support shaft.

[0008] This further optimizes the axial load bearing, allowing each angular contact bearing to evenly distribute the load, thereby improving load-bearing capacity and extending service life.

[0009] In some embodiments, any two adjacent angular contact bearings are arranged opposite each other.

[0010] This configuration allows the two angular contact bearings to form a more balanced supporting force on the support shaft, further optimizing the force distribution; moreover, this configuration improves the ability to resist overturning moment.

[0011] In some embodiments, the gimbal further includes a preload structure connected to the support shaft and movable axially along the support shaft to abut the angular contact bearing.

[0012] In other words, by using the preload structure, the preload force of the angular contact bearing on the support shaft can be adjusted, which not only improves the rigidity and precision of the bearing, but also helps to reduce the radial and axial clearance of the bearing during operation.

[0013] In some embodiments, one end of the support shaft is provided with a shoulder, and the other end is connected to the preload structure. Two angular contact bearings are provided and spaced apart and arranged in opposite directions. The shoulder and the preload structure are separately provided and abut against the opposite sides of the two angular contact bearings.

[0014] This configuration effectively reduces the axial movement of the two angular contact bearings during operation, thus ensuring stable assembly of the angular contact bearings.

[0015] In some embodiments, the central housing is provided with a first assembly hole that communicates with the assembly cavity and is used for the support shaft to pass through. The wall of the first assembly hole is provided with a limiting protrusion that protrudes radially inward, and the opposing sides of the two angular contact bearings abut against the limiting protrusion.

[0016] Understandably, the limiting protrusions can be used to limit the assembly of two angular contact bearings, thus ensuring stable assembly of each angular contact bearing while simplifying the structure.

[0017] In some embodiments, the axis of the support shaft coincides with the axis of the worm gear shaft.

[0018] This configuration allows axial loads to be transmitted along a straight path, thereby avoiding additional bending moments caused by the offset of the support shaft relative to the worm gear shaft, and thus improving the stability of the central housing during pitching motion.

[0019] In some embodiments, the connection structure includes a side bracket and a connecting frame, wherein the connecting frame is rigidly connected to the side bracket at both ends along the axial direction of the worm gear shaft, and the side bracket is rigidly connected to the worm gear shaft or the support shaft.

[0020] In other words, the side brackets and connecting brackets work together to form a U-shape, achieving a rigid connection between the worm gear shaft and the support shaft, which is beneficial for axial load transmission; moreover, this setup optimizes the spatial layout and reduces the overall space occupied.

[0021] In some embodiments, the connection is mounted above the central housing and spaced apart from it.

[0022] This design reduces assembly interference between the connecting frame and the central housing, and in particular, avoids interference caused by the pitch rotation of the connecting frame on the central housing, which would affect the rotation range.

[0023] In some embodiments, the worm gear shaft includes a shaft body and a meshing portion disposed on the shaft body. The meshing portion protrudes radially from the shaft body, and the deep groove ball bearing is disposed at both ends of the meshing portion along the axial direction of the shaft body.

[0024] This configuration, while satisfying the axial load support requirements, improves the uniformity of force distribution on the worm gear shaft, reduces wear caused by uneven force distribution, and further enhances the durability and stability of the worm gear shaft. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 An exploded cross-sectional view of a gimbal structure provided in an embodiment of this application;

[0027] Figure 2 A cross-sectional view of a gimbal structure provided in an embodiment of this application;

[0028] Figure 3 This is a partial cross-sectional view of the support shaft in a gimbal structure provided in an embodiment of this application;

[0029] Figure 4 This is a partial cross-sectional view of the worm gear shaft in a gimbal structure provided in an embodiment of this application;

[0030] Figure 5A schematic diagram of the support shaft in a gimbal structure provided in an embodiment of this application;

[0031] Figure 6 A schematic diagram of the preload seat in a gimbal structure provided in an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of a pre-tightening gasket in a gimbal structure provided in an embodiment of this application.

[0033] Reference numerals: 10. Middle housing; 20. Pitch mechanism; 21. Worm gear shaft; 22. Worm gear housing; 23. Worm gear drive structure; 24. End cover; 30. Support shaft; 31. Threaded section; 32. Shoulder; 40. Connecting structure; 41. Side bracket; 42. Connecting frame; 51. Deep groove ball bearing; 52. Angular contact bearing; 60. Preload structure; 61. Preload seat; 62. Preload shim; 101. Assembly cavity; 102. First assembly hole; 103. Second assembly hole; 211. Shaft body; 212, meshing part; 213, stop; 221, shoulder; 231, worm; 232, worm wheel; 411, first side bracket; 412, second side bracket; 521, left side bearing; 522, right side bearing; 601, limiting groove; 602, limiting stop; 603, assembly groove; 604, assembly stop; 701, threaded hole; 702, screw; 1021, limiting protrusion; 4201, assembly notch; 4101, connecting section; 6101, threaded through hole. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when a component is referred to as being "fixed to" or "attached to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0036] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0039] Please see Figures 1 to 4 One embodiment of this application provides a gimbal, including a central housing 10, a pitch mechanism 20, a support shaft 30, and a connecting structure 40. The central housing 10 has an assembly cavity 101, and the pitch mechanism 20 is disposed in the assembly cavity 101, and includes at least a worm gear housing 22 and a worm gear shaft 21 rotatably connected to the worm gear housing 22. A deep groove ball bearing 51 is provided between the worm gear shaft 21 and the worm gear housing 22, and the worm gear shaft 21 is connected to the central housing 10. The support shaft 30 passes through the assembly cavity 101 and is rotatably connected to the central housing 10. One end of the connecting structure 40 is rigidly connected to the worm gear shaft 21, and the other end is rigidly connected to the support shaft 30.

[0040] The pitch mechanism 20 also includes a worm gear transmission structure 23, which is located inside the worm gear housing 22 and is connected to the worm gear shaft 21. The worm gear shaft 21 outputs power to the worm gear transmission structure 23. In actual use, a camera structure is installed in the assembly cavity 101 enclosed by the central housing 10 to capture images around the pan-tilt unit and perform monitoring functions. The pan-tilt unit also includes a power source, which is connected to the worm gear transmission structure 23. This power source, through the worm gear shaft 21, drives the central housing 10 to perform pitch movements around the axis of the worm gear shaft 21, thereby adjusting the monitoring range of the camera structure.

[0041] During this process, the worm gear drive structure 23 generates alternating axial loads on the worm gear shaft 21. The deep groove ball bearing 51 can withstand both radial and axial loads. The worm gear shaft 21 is rigidly connected to the support shaft 30 via the connecting structure 40. Therefore, the worm gear shaft 21 can transfer the axial load it bears to the support shaft 30 through the connecting structure 40, where it is carried by the angular contact bearing 52 installed on the support shaft 30. This reduces the axial load on the worm gear shaft 21, improves its assembly reliability, extends its service life, and enhances the accuracy and reliability of the gimbal. Moreover, because the two ends of the connecting structure 40 can be rigidly connected to the worm gear shaft 21 and the support shaft 30 respectively, a stable mechanical transmission path is formed between the worm gear shaft 21 and the support shaft 30. This design not only enhances the overall rigidity of the gimbal structure but also effectively prevents deformation of the worm gear shaft 21 or the support shaft 30 due to excessive axial loads, thus ensuring the stability and accuracy of the gimbal under long-term, high-intensity use. Furthermore, it is precisely because of this design that the worm gear shaft 21, the connecting structure 40, and the support shaft 30 together form a rigid frame structure, which enhances the overall resistance to external interference and ensures the accuracy and stability of the gimbal in harsh environments.

[0042] Please see Figures 1 to 3 In some embodiments, at least two angular contact bearings 52 are provided and arranged axially spaced along the support shaft 30. This arrangement can further optimize the stress distribution on the support shaft 30 when subjected to axial loads, allowing each angular contact bearing 52 to evenly distribute the load, thereby improving the bearing's service life and load-bearing capacity. Simultaneously, the axially spaced arrangement also helps enhance the overall stability of the gimbal, reducing vibration and noise caused by uneven stress, further improving the gimbal's accuracy and reliability.

[0043] Please see Figures 1 to 4 Furthermore, taking the example of having two angular contact bearings 52, two deep groove ball bearings 51 are also provided and arranged axially spaced along the worm gear shaft 21. Thus, the cooperation of the two deep groove ball bearings 51 and the two angular contact bearings 52 means that the radial load during the pitching motion of the pitching structure driving the central housing 10 can be shared by four bearings. The two deep groove ball bearings 51 mainly bear the radial load at the worm gear shaft 21, and the two angular contact bearings 52 mainly bear the radial load at the support shaft 30, thereby significantly reducing the radial load on individual bearings and extending the overall lifespan of each bearing and the entire gimbal structure.

[0044] like Figure 3As shown, in some specific embodiments, two angular contact bearings 52 are provided, and the two angular contact bearings 52 are arranged back-to-back. This back-to-back arrangement allows the two angular contact bearings 52 to form a more balanced supporting force on the support shaft 30, further optimizing the force distribution; moreover, this arrangement improves the anti-overturning moment capability. When the gimbal is subjected to axial load, the two angular contact bearings 52 can function simultaneously, jointly bearing the load, thereby improving the overall load-bearing capacity and stability. In addition, the back-to-back arrangement of the angular contact bearings 52 also helps to reduce wear caused by uneven force distribution, extending the bearing service life and further improving the performance and reliability of the gimbal.

[0045] like Figure 1 , Figure 2 and Figure 4 As shown, in some specific embodiments, the worm gear shaft 21 includes a shaft body 211 and a meshing portion 212 disposed on the shaft body 211. The meshing portion 212 protrudes radially from the shaft body 211, and deep groove ball bearings 51 are provided at both ends of the meshing portion 212 along the axial direction of the shaft body 211.

[0046] Specifically, the worm 231 is connected to a power source, such as an electric motor. The meshing portion 212 is arranged in a ring shape to form the worm wheel 232 in the worm gear transmission structure 23. Therefore, the meshing portion 212 meshes with the worm 231 to drive the worm wheel shaft 21 to rotate, thus transmitting power. Consequently, the deep groove ball bearings 51 located on both sides of the meshing portion 212, while satisfying axial load support, improve the uniformity of force distribution on the worm wheel shaft 21, reduce wear caused by uneven force distribution, and further improve the durability and stability of the worm wheel shaft 21. Furthermore, this arrangement makes the worm wheel shaft 21 rotate more smoothly, reducing vibration and noise, and improving the overall operating quality of the gimbal.

[0047] In actual use, the aforementioned worm gear housing 22 is provided with a shoulder 221 to abut against the outer ring of the deep groove ball bearing 51; and the shaft body 211 is provided with a stop 213 to abut against the inner ring of the deep groove ball bearing 51. Meanwhile, the pitch mechanism 20 also includes an end cap 24, which is connected to the worm gear housing 22 and located on the side of the worm gear housing 22 facing the support shaft 30. The end cap 24 can abut against and limit the movement of the adjacent outer ring of the deep groove ball bearing 51.

[0048] Please continue reading. Figures 1 to 3In some embodiments, the gimbal also includes a preload structure 60, which is connected to the support shaft 30 and can move axially along the support shaft 30 to engage the angular contact bearing 52. That is, by using the preload structure 60, the preload force of the angular contact bearing 52 on the support shaft 30 can be adjusted, ensuring that the angular contact bearing 52 maintains appropriate tension during operation. This not only improves the rigidity and precision of the bearing but also helps reduce radial and axial clearances during operation, thereby reducing vibration and noise and enhancing the overall performance of the gimbal. Furthermore, because the preload structure 60 can move axially along the support shaft 30, it can also be used to compensate for changes in axial clearance caused by temperature variations or wear, maintaining the long-term stable operation of the gimbal.

[0049] In some specific embodiments, the middle housing 10 is provided with a first assembly hole 102 that communicates with the assembly cavity 101 and is used to support the shaft 30 through which it passes. The wall of the first assembly hole 102 is provided with a limiting protrusion 1021 that protrudes radially inward. The limiting protrusion 1021 can abut against the outer ring of the angular contact bearing 52, and the aforementioned preload structure 60 can abut against the inner ring of the angular contact bearing 52.

[0050] Please see Figure 3 , Figure 5 , Figure 6 and Figure 7 Specifically, the preload structure 60 includes a preload seat 61 and a preload washer 62 that is connected to the preload seat 61 for positioning. The preload washer 62 is pressed between the preload seat 61 and the angular contact bearing 52, and the preload seat 61 is threadedly connected to the support shaft 30. The support shaft 30 has a threaded section 31, and the preload seat 61 has a threaded through hole 6101 to satisfy the threaded connection between the two. Thus, the preload force of the relative angular contact bearing 52 can be adjusted by rotating the preload seat 61, which is convenient to operate. Moreover, this design also facilitates the disassembly, assembly, and maintenance of the angular contact bearing 52. The preload seat 61 can directly use a preload nut.

[0051] Furthermore, the support shaft 30 has a limiting groove 601 in the threaded section 31, and the inner ring of the preload washer 62 has a limiting baffle 602. Both the limiting baffle 602 and the limiting groove 601 extend axially along the support shaft 30. The limiting baffle 602 can extend into the limiting groove 601 and engage to restrict the circumferential rotation of the preload washer 62 relative to the support shaft 30. Moreover, this arrangement guides the axial movement of the preload washer 62 relative to the support shaft 30, facilitating the proper assembly of the preload washer 62. Conversely, if the limiting baffle 602 is located on the support shaft 30 and the limiting groove 601 is located on the inner ring of the preload washer 62, the above requirements can also be met. This is merely an example.

[0052] Furthermore, the preload seat 61 has an assembly groove 603 on its outer periphery, and the preload washer 62 has an assembly baffle 604 on its outer ring. The assembly baffle 604 can be engaged within the assembly groove 603, causing the preload seat 61 and the preload washer 62 to connect into a single structure, and also limiting the circumferential rotation between the preload seat 61 and the preload washer 62. Similarly, the assembly groove 603 on the preload washer 62 and the assembly baffle 604 on the preload seat 61 can also satisfy the assembly limiting function. This is only an example.

[0053] The aforementioned assembly groove 603 and limiting baffle 602 can each be provided as a single set, or multiple sets can be provided and arranged at intervals along the circumference of the support shaft 30. The aforementioned assembly groove 603 and assembly baffle 604 can also be provided as multiple sets and arranged at intervals along the circumference of the support shaft 30. This is merely an example.

[0054] Please see Figures 1 to 3 In some embodiments, taking two angular contact bearings 52 as an example, the two angular contact bearings 52 are arranged axially spaced along the support shaft 30. One end of the support shaft 30 is provided with a shoulder 32, and the other end is connected to the aforementioned preload structure 60. The shoulder 32 and the preload structure 60 are separately located and abut against the opposite sides of the two angular contact bearings 52. That is, the shoulder 32 and the preload structure 60 are separately located on the opposite sides of the two angular contact bearings 52, and respectively abut against and limit the inner ring of the corresponding angular contact bearing 52, effectively reducing the axial movement of the two angular contact bearings 52 during operation, so as to meet the stable assembly of the angular contact bearings 52. Moreover, it is precisely because of the threaded connection between the preload structure 60 and the support shaft 30 that when the preload structure 60 rotates to move toward the angular contact bearing 52, it will exert a reverse pulling force on the support shaft 30 bracket, causing the shoulder 32 to move closer to the angular contact bearing 52, which is beneficial for adjusting the assembly force of the angular contact bearing 52.

[0055] like Figure 3 As shown, in some specific embodiments, the axial direction of the support shaft 30 is... Figure 3 In the left-right direction, the two angular contact bearings 52 are the left bearing 521 and the right bearing 522, respectively. The preload structure 60 abuts against the inner ring of the left bearing 521, and the shoulder 32 abuts against the inner ring of the right bearing 522. When the preload structure 60 rotates to move to the right, it applies a leftward pulling force to the support shaft 30, increasing the limiting effect of the shoulder 32 on the right bearing 522, and also strengthening the limiting effect between the preload structure 60 and the left bearing 521. This is only an example.

[0056] Furthermore, the two angular contact bearings 52 are respectively positioned on both sides of the aforementioned limiting protrusion 1021 along the axial direction of the support shaft 30, thereby limiting the outer rings of the two angular contact bearings 52. In this way, stable assembly of each angular contact bearing 52 is achieved while simplifying the structure.

[0057] Please continue reading. Figures 1 to 3 In some embodiments, the axis of the support shaft 30 coincides with the axis of the worm gear shaft 21, that is, the support shaft 30 and the worm gear shaft 21 are coaxially arranged. This arrangement allows axial loads to be transmitted along a straight path, thereby avoiding additional bending moments caused by the offset of the support shaft 30 relative to the worm gear shaft 21, and thus improving the stability of the central housing 10 during pitching motion.

[0058] Please continue reading. Figures 1 to 3 In some embodiments, the connecting structure 40 includes a side bracket 41 and a connecting frame 42. The connecting frame 42 is rigidly connected to the side bracket 41 at both ends along the axial direction of the worm gear shaft 21. The side bracket 41 is rigidly connected to the worm gear shaft 21 or the support shaft 30.

[0059] Specifically, a first side bracket 411 is rigidly connected to the worm gear shaft 21, and a second side bracket 412 is rigidly connected to the support shaft 30. The first side bracket 411 and the second side bracket 412 are respectively located at both ends of the connecting frame 42 along the axial direction of the worm gear shaft 21 and connected to form the aforementioned rigid frame structure. The opposite ends of the worm gear shaft 21 and the support shaft 30 are each provided with multiple threaded holes 701 arranged circumferentially. The first side bracket 411 is rigidly connected to the worm gear shaft 21 by multiple screws 702 arranged circumferentially, and the second side bracket 412 is rigidly connected to the support shaft 30 by multiple screws 702 arranged circumferentially. The middle housing 10 is also provided with a second assembly hole 103 communicating with the assembly cavity 101. The end of the worm gear shaft 21 facing away from the support shaft 30 can pass through the second assembly hole 103 and be connected to the first side bracket 411 using a flange.

[0060] The first side support 411 and the second side support 412 are both arranged vertically, while the connecting frame 42 is arranged horizontally. The first side support 411, the connecting frame 42, and the second side support 412 are connected sequentially to form a U-shape. This arrangement provides stable support while optimizing the spatial layout and reducing the overall space occupied.

[0061] Furthermore, the connecting frame 42 is positioned above the central housing 10 and spaced apart from it. This arrangement reduces assembly interference between the connecting frame 42 and the central housing 10, particularly preventing interference from the connecting frame 42's pitch rotation on the central housing 10, thus affecting the rotation range. The connecting frame 42 has assembly notches 4201 on both sides along the left-right direction, and the cross-section of the assembly notches 4201 is L-shaped. The upper side of the first side bracket 411 and the second side bracket 412 extends vertically upward to form a connecting section 4101. The end of the connecting section 4101 is pressed against the vertical end face of the assembly notch 4201 and then fixedly connected by screws 702 to achieve a rigid connection between the two side brackets 41 and the connecting frame 42. The vertical direction is... Figure 1 and Figure 2 The up and down directions in the middle.

[0062] In some embodiments, the gimbal further includes a support base, which is U-shaped. The two vertical sides of the U-shape are connected to the first side bracket 411 and the second side bracket 412, respectively, to support the central housing 10. The support base is used to install the gimbal at the target location where it needs to be installed. Alternatively, the gimbal can be installed at the target location via the aforementioned connecting bracket 42. This is merely an example.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A gimbal, characterized in that, include: The middle shell (10) is provided with an assembly cavity (101). The pitch mechanism (20) is located in the assembly cavity (101) and includes at least a worm gear housing (22) and a worm gear shaft (21) rotatably connected to the worm gear housing (22). A deep groove ball bearing (51) is provided between the worm gear shaft (21) and the worm gear housing (22). The worm gear shaft (21) is connected to the middle housing (10). A support shaft (30) passes through the assembly cavity (101) and is rotatably connected to the middle housing (10). An angular contact bearing (52) is provided between the support shaft (30) and the middle housing (10). The connecting structure (40) is rigidly connected at one end to the worm gear shaft (21) and rigidly connected at the other end to the support shaft (30).

2. The gimbal according to claim 1, characterized in that, The angular contact bearings (52) are provided in at least two and are spaced apart along the axial direction of the support shaft (30).

3. The gimbal according to claim 2, characterized in that, Any two adjacent angular contact bearings (52) are arranged opposite to each other.

4. The gimbal according to claim 1, characterized in that, The gimbal also includes a preload structure (60) which is connected to the support shaft (30) and is axially movable along the support shaft (30) to abut against the angular contact bearing (52).

5. The gimbal according to claim 4, characterized in that, One end of the support shaft (30) is provided with a shoulder (32), and the other end is connected to the preload structure (60). The angular contact bearing (52) is provided with two spaced apart and back-to-back. The shoulder (32) and the preload structure (60) are respectively provided and abut against the two back-to-back sides of the two angular contact bearings (52).

6. The gimbal according to claim 5, characterized in that, The middle housing (10) is provided with a first assembly hole (102) that communicates with the assembly cavity (101) and is used for the support shaft (30) to pass through. The hole wall of the first assembly hole (102) is provided with a limiting protrusion (1021) that protrudes radially inward. The opposite sides of the two angular contact bearings (52) abut against the limiting protrusion (1021).

7. The gimbal according to claim 1, characterized in that, The axis of the support shaft (30) coincides with the axis of the worm gear shaft (21).

8. The gimbal according to claim 1, characterized in that, The connection structure (40) includes a side bracket (41) and a connecting frame (42). The connecting frame (42) is rigidly connected to the side bracket (41) at both ends along the axial direction of the worm gear shaft (21). The side bracket (41) is rigidly connected to the worm gear shaft (21) or the support shaft (30).

9. The gimbal according to claim 8, characterized in that, The connecting frame (42) is located above the central housing (10) and is spaced apart from the central housing (10).

10. The gimbal according to claim 1, characterized in that, The worm gear shaft (21) includes a shaft body (211) and a meshing portion (212) provided on the shaft body (211). The meshing portion (212) protrudes radially from the shaft body (211). Both ends of the meshing portion (212) along the axial direction of the shaft body (211) are provided with the deep groove ball bearing (51).

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