Eccentric spherical limit bearing and photovoltaic tracking support

Abstract

Embodiments of the present application provide an eccentric spherical limit bearing and a photovoltaic tracking support, and relate to the field of photovoltaic tracking supports. The eccentric limit structure used by the photovoltaic tracking support is improved. The eccentric spherical limit bearing comprises a ball bearing and a bearing shell, and a circumferential limiting portion is arranged on the outer circumferential surface of the ball bearing; an eccentric shaft hole is arranged in the middle of the ball bearing, and the eccentric shaft hole is used for mounting a main square tube; the bearing shell is provided with a bearing hole, and the circumferential limiting portion is used for abutting against the circumferential limiting portion during rotation of the ball bearing, so as to limit the rotation of the ball bearing. The photovoltaic tracking support comprises the above-mentioned eccentric spherical limit bearing. The circumferential rotation angle of the ball bearing is limited by the circumferential limiting portion and the circumferential limiting portion; the shaft hole is eccentrically arranged in the ball bearing, the photovoltaic module can be installed on the side of the main square tube closer to the rotation center of the ball bearing, the torque is reduced, the motion speed is increased, and the protection position can be quickly rotated when a strong wind comes.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic tracking brackets, and more specifically, to an eccentric spherical limiting bearing and a photovoltaic tracking bracket. Background Technology

[0002] In the field of photovoltaic (PV) tracking systems, the single-axis flat-mount system, as the mainstream tracking system structure, plays a crucial role in increasing the power generation of PV power plants due to its high efficiency and stability. The single-axis flat-mount system, also known as a single-axis flat-mount tracking system, is an intelligent tracking system for solar photovoltaic power generation. It improves solar energy collection efficiency by adjusting the angle of the photovoltaic panels to ensure they always face the sun.

[0003] A single-axis flatbed system includes a drive system, spindle, column, purlins, bearings, and various connecting parts. Currently, the mainstream solution on the market involves the spindle passing through the center of the bearing, with the drive system rotating the spindle. The center of gravity of the drive system, spindle, and bearing is aligned with the center of rotation, allowing the spindle and bearing to rotate 360°. However, at the 60° protection position, due to the lack of limit, the actual angle increases, leading to increased load on the tracking bracket, poor component flatness, high torque, and excessively slow rotation speed.

[0004] Compared to mainstream solutions, a few employ eccentric rotation schemes, where the drive rotation center and the spindle's center of gravity are not aligned. This eccentric rotation scheme offers a significant advantage: it reduces the rotational torque of the load, achieving faster rotational speeds. Furthermore, the eccentricity can be designed with limit positions, preventing further rotation after reaching a certain extreme angle. Currently, eccentric rotation schemes mainly include: 1. Pendulum-type eccentric bearings, where the spindle center is below the rotation center, creating an eccentricity and limiting the rotation at ±60° positions; 2. Designing a large slide rail raceway, where the raceway's rotation center is above the spindle center, creating an eccentricity and limiting the rotation at ±60° positions. Both of these schemes achieve eccentricity and limiting structures, but they are more complex and involve more parts. Summary of the Invention

[0005] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0006] The present invention aims to provide, for example, an eccentric spherical limiting bearing that can improve the problem of complex eccentric limiting structures used in photovoltaic tracking brackets for eccentric limiting rotation.

[0007] The present invention also aims to provide a photovoltaic tracking bracket that can improve the problem of the complex eccentric limiting structure used in the eccentric limiting rotation of the photovoltaic tracking bracket.

[0008] The embodiments of the present invention can be implemented as follows:

[0009] An embodiment of the present invention provides an eccentric spherical limiting bearing for mounting a main square tube of a photovoltaic module. The main square tube is used to mount the photovoltaic module. The eccentric spherical limiting bearing includes a ball bearing and a bearing housing. The outer circumferential surface of the ball bearing is spherical, and a circumferential limiting portion is provided on the outer circumferential surface of the ball bearing. An eccentric shaft hole is provided in the middle of the ball bearing, and the central axis of the eccentric shaft hole is offset from the central axis of the ball bearing. The eccentric shaft hole is used to mount the main square tube. The bearing housing is provided with a bearing hole for rotatably mounting the ball bearing. A circumferential stop portion is provided in the bearing hole. The circumferential stop portion is used to abut against the circumferential limiting portion during the rotation of the ball bearing to stop the rotation of the ball bearing.

[0010] Optionally, the circumferential stop portion includes a first stop surface and a second stop surface that are circumferentially spaced along the bearing hole, and the circumferential limiting portion is slidably disposed between the first stop surface and the second stop surface, the first stop surface and the second stop surface being used to stop the circumferential rotation of the circumferential limiting portion.

[0011] Optionally, the bearing hole includes a first circumferential surface and a second circumferential surface, the first circumferential surface, the first stop surface, the second circumferential surface and the second stop surface are connected in sequence; wherein, the first circumferential surface is closer to the central axis of the bearing hole than the second circumferential surface, the first stop surface and the second stop surface extend radially along the bearing hole, and the first stop surface, the first circumferential surface and the second stop surface form the circumferential stop portion.

[0012] Optionally, the first circumferential surface, the first stop surface, the second circumferential surface, and the second stop surface are all arc-shaped structures, and are smoothly connected to each other through arc-shaped structures.

[0013] Optionally, the circles corresponding to the first circumferential surface and the circles corresponding to the second circumferential surface are concentric circles.

[0014] Optionally, the outer circumferential surface of the ball bearing includes a third circumferential surface, a first stepped surface, a fourth circumferential surface, and a second stepped surface connected in sequence; wherein, the third circumferential surface is closer to the central axis of the ball bearing than the fourth circumferential surface, the first stepped surface and the second stepped surface extend radially along the ball bearing, and the first stepped surface, the fourth circumferential surface, and the second stepped surface form the circumferential limiting portion, the first stepped surface is used to abut against or separate from the first stop surface during the rotation of the ball bearing, and the second stepped surface is used to abut against or separate from the second stop surface during the rotation of the ball bearing.

[0015] Optionally, the third circumferential surface, the first step surface, the fourth circumferential surface, and the second step surface are all arc-shaped structures, and are smoothly connected to each other through arc-shaped structures.

[0016] Optionally, the eccentric shaft hole is quadrilateral, and adjacent edges are connected by rounded transitions.

[0017] Optionally, the area of ​​the eccentric shaft hole coincides with the projection of the central axis of the ball bearing onto a section perpendicular to the axial direction of the eccentric shaft hole.

[0018] An embodiment of the present invention also provides a photovoltaic tracking bracket. The photovoltaic tracking bracket includes a column, a main square tube, and an eccentric spherical limiting bearing; the main square tube is rotatably mounted on the column via the eccentric spherical limiting bearing.

[0019] The beneficial effects of the eccentric spherical limiting bearing and photovoltaic tracking bracket of the present invention include, for example:

[0020] An eccentric spherical bearing includes a ball bearing and a bearing housing. The outer circumferential surface of the ball bearing is spherical, and a circumferential limiting part is provided on the outer circumferential surface of the ball bearing. An eccentric shaft hole is provided in the middle of the ball bearing, and the central axis of the eccentric shaft hole is offset from the central axis of the ball bearing. The eccentric shaft hole is used to install a main square tube. The bearing housing is provided with a bearing hole for rotatably installing the ball bearing. A circumferential stop part is provided in the bearing hole. The circumferential stop part is used to abut against the circumferential limiting part during the rotation of the ball bearing to stop the rotation of the ball bearing.

[0021] By cooperating with the circumferential limiting part and the circumferential stopping part, the circumferential rotation angle of the ball bearing is limited. The limiting is achieved with a low-cost and simple structure, while retaining the unique adjustment advantages of the ball bearing. In addition, the main square tube is eccentrically set inside the ball bearing through the shaft hole, and the photovoltaic module can be installed on the side of the main square tube closer to the rotation center of the ball bearing. This reduces the distance between the photovoltaic module panel and the rotation point, reduces torque, and increases the rotation speed. When strong winds occur, it can rotate back to the protection position more quickly.

[0022] The photovoltaic tracking bracket includes the aforementioned eccentric spherical limiting bearing, which can improve the problem of the complex eccentric limiting structure used in the eccentric limiting rotation of the photovoltaic tracking bracket. Attached Figure Description

[0023] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0024] Figure 1 This is a front view of an eccentric spherical limiting bearing provided in an embodiment of the present invention;

[0025] Figure 2 This is an axial view of an eccentric spherical limiting bearing provided in an embodiment of the present invention;

[0026] Figure 3 An exploded view of the eccentric spherical limiting bearing provided in an embodiment of the present invention;

[0027] Figure 4 This is a front view of the ball bearing in the eccentric spherical limiting bearing provided in an embodiment of the present invention;

[0028] Figure 5 A side view of the ball bearing in the eccentric spherical limiting bearing provided in an embodiment of the present invention;

[0029] Figure 6 A side view of the bearing housing in an eccentric spherical limiting bearing provided in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the assembly structure of a photovoltaic module mounted on a photovoltaic tracking bracket, provided in an embodiment of the present invention.

[0031] Figure 8 This is a schematic diagram of the structure of a photovoltaic module relative to the rotation center, provided in an embodiment of the present invention.

[0032] Icons: 10-Photovoltaic tracking bracket; 11-Column; 12-Eccentric spherical limiting bearing; 13-Main square tube; 20-Photovoltaic module; 100-Ball bearing; 110-Circumferential limiting part; 101-Third circumferential surface; 102-First step surface; 103-Fourth circumferential surface; 104-Second step surface; 120-Eccentric shaft hole; 200-Bearing housing; 210-Bearing hole; 220-Circumferential stop part; 201-First circumferential surface; 202-First stop surface; 203-Second circumferential surface; 204-Second stop surface. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0034] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] The following is combined with Figures 1 to 8 The eccentric spherical limiting bearing 12 provided in this embodiment will be described in detail.

[0038] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 7 An embodiment of the present invention provides an eccentric spherical limiting bearing 12 for mounting the main square tube 13 of a photovoltaic module 20. The main square tube 13 is used to mount the photovoltaic module 20. The eccentric spherical limiting bearing 12 includes a ball bearing 100 and a bearing housing 200. The outer circumferential surface of the ball bearing 100 is spherical, and a circumferential limiting part 110 is provided on the outer circumferential surface of the ball bearing 100. An eccentric shaft hole 120 is provided in the middle of the ball bearing 100. The central axis of the eccentric shaft hole 120 is offset from the central axis of the ball bearing 100. The eccentric shaft hole 120 is used to mount the main square tube 13. The bearing housing 200 is provided with a bearing hole 210 for rotatably mounting the ball bearing 100. A circumferential stop part 220 is provided in the bearing hole 210. The circumferential stop part 220 is used to abut against the circumferential limiting part 110 during the rotation of the ball bearing 100 to stop the rotation of the ball bearing 100.

[0039] During installation, the ball bearing 100 is rotatably mounted in the bearing hole 210 of the bearing housing 200, the main square tube 13 of the photovoltaic module 20 passes through the eccentric shaft hole 120 of the ball bearing 100, the photovoltaic module 20 is mounted on the main square tube 13, and the photovoltaic module 20 is used to rotate around the axis of the ball bearing 100.

[0040] During the forward rotation of the ball bearing 100 relative to the bearing housing 200, the ball bearing 100 stops rotating when it comes into contact with the circumferential limiting part 110 and the circumferential stop part 220. Similarly, during the reverse rotation of the ball bearing 100 relative to the bearing housing 200, the ball bearing 100 stops rotating when it comes into contact with the circumferential limiting part 110 and the circumferential stop part 220. The circumferential limiting part 110 and the circumferential stop part 220 limit the rotation range of the ball bearing 100, ensuring that the ball bearing 100 can only rotate within the circumferential limiting angle range of the circumferential limiting part 110 and the circumferential stop part 220. This limits the rotation angle of the photovoltaic module 20. Each point is locked at the circumferential stop part 220, resulting in better and more aesthetically pleasing flatness of the support structure. Each point is at the angle limited by the circumferential stop part 220, ensuring the flatness of the photovoltaic module 20 during rotation. At the same time, each bearing point cannot continue to rotate at the circumferential limit angle, which objectively forms a locking point. The support forms multiple locking states at each bearing point at the circumferential limit angle, which enhances wind resistance and allows for smaller main beam pipe specifications, thus achieving cost reduction.

[0041] Furthermore, the eccentric shaft hole 120 is eccentrically located in the middle of the ball bearing 100, as shown in the reference. Figure 8 The main square tube 13 of the photovoltaic module 20 is eccentrically positioned in the middle of the ball bearing 100. The photovoltaic module 20 can be installed on the side of the main square tube 13 closer to the rotation center of the ball bearing 100. Figure 8 To explain the relative positions, the photovoltaic module 20 is positioned on the upper right side of the eccentric shaft hole 120, rather than the lower left side. The upper right side is closer to the rotation center of the ball bearing 100 than the lower left side. Therefore, regardless of whether the photovoltaic module 20 is installed by aligning the main shaft with the bearing center or by eccentrically positioning it outside the bearing, this solution reduces the distance L between the photovoltaic module 20 and the rotation point, thus reducing the gravitational torque T. The power P equals the torque T multiplied by the rotational speed n, i.e., P = T × n. With the same power, a reduced torque results in a faster rotational speed, allowing the photovoltaic support to rotate faster. When strong winds occur, it can enter the support protection position more quickly. According to P = T × n, the power requirement of the tracking support can also be lower, resulting in greater energy savings.

[0042] In this embodiment, the maximum circumferential spacing angle between the circumferential limiting part 110 and the circumferential stopping part 220 is 60°.

[0043] Reference Figure 6 In this embodiment, the circumferential stop portion 220 includes a first stop surface 202 and a second stop surface 204 that are circumferentially spaced along the bearing hole 210. The circumferential limiting portion 110 is slidably disposed between the first stop surface 202 and the second stop surface 204. The first stop surface 202 and the second stop surface 204 are used to stop the circumferential rotation of the circumferential limiting portion 110.

[0044] The circumferential limiting part 110 rotates synchronously with the ball bearing 100. During the forward and reverse rotation of the ball bearing 100, the circumferential limiting part 110 abuts against the first stop surface 202 or the second stop surface 204, and the ball bearing 100 stops rotating.

[0045] The maximum circumferential angle range between the first stop surface 202 and the circumferential limiting part 110 is the rotation angle limiting range of the ball bearing 100. Similarly, the maximum circumferential angle range between the second stop surface 204 and the circumferential limiting part 110 is the rotation angle limiting range of the ball bearing 100.

[0046] Reference Figure 6 In this embodiment, the bearing hole 210 includes a first circumferential surface 201 and a second circumferential surface 203. The first circumferential surface 201, the first stop surface 202, the second circumferential surface 203 and the second stop surface 204 are connected in sequence. The first circumferential surface 201 is closer to the central axis of the bearing hole 210 than the second circumferential surface 203. The first stop surface 202 and the second stop surface 204 extend radially along the bearing hole 210. The first stop surface 202, the first circumferential surface 201 and the second stop surface 204 form the circumferential stop portion 220.

[0047] "The first circumferential surface 201 is close to the central axis of the bearing hole 210 relative to the second circumferential surface 203", so the first circumferential surface 201 protrudes towards the center of the bearing hole 210 relative to the second circumferential surface 203. The first stop surface 202 and the second stop surface 204 extend radially along the bearing hole 210 to form a stepped structure, thereby being able to support the circumferential limiting part 110.

[0048] Reference Figure 6 In this embodiment, the first circumferential surface 201, the first stop surface 202, the second circumferential surface 203, and the second stop surface 204 are all arc-shaped structures, and are smoothly connected to each other through the arc-shaped structure.

[0049] The outer circumferential surface of the ball bearing 100 is spherical, and the inner surface of the bearing bore 210 is also spherical. The first circumferential surface 201, the first stop surface 202, the second circumferential surface 203, and the second stop surface 204 are sequentially connected to form the inner surface of the bearing bore 210. In order to improve the compatibility with the ball bearing 100 and reduce the friction loss between the circumferential limiting part 110 and the first stop surface 202, as well as the second stop surface 204, the first circumferential surface 201, the first stop surface 202, the second circumferential surface 203, and the second stop surface 204 are all arc surfaces, and the connection position also adopts an arc surface structure, which can reduce limiting wear and extend the service life of the ball bearing 100.

[0050] Reference Figure 6 In this embodiment, the circles corresponding to the first circumferential surface 201 and the second circumferential surface 203 are concentric circles. This improves the compatibility between the first circumferential surface 201 and the second circumferential surface 203 and the ball bearing 100.

[0051] Reference Figure 4 and Figure 5 In this embodiment, the outer circumferential surface of the ball bearing 100 includes a third circumferential surface 101, a first stepped surface 102, a fourth circumferential surface 103, and a second stepped surface 104 connected in sequence. The third circumferential surface 101 is closer to the central axis of the ball bearing 100 than the fourth circumferential surface 103. The first stepped surface 102 and the second stepped surface 104 extend radially along the ball bearing 100. The first stepped surface 102, the fourth circumferential surface 103, and the second stepped surface 104 form a circumferential limiting portion 110. The first stepped surface 102 is used to abut against or separate from the first stop surface 202 during the rotation of the ball bearing 100, and the second stepped surface 104 is used to abut against or separate from the second stop surface 204 during the rotation of the ball bearing 100.

[0052] "The third circumferential surface 101 is positioned relative to the fourth circumferential surface 103 and close to the central axis of the ball bearing 100," meaning the third circumferential surface 101 protrudes towards the central axis of the ball bearing 100 relative to the fourth circumferential surface 103. The first stepped surface 102 and the second stepped surface 104 extend radially along the ball bearing 100 to form a stepped structure, thereby enabling them to abut against the first stop surface 202 and the second stop surface 204.

[0053] Reference Figure 4 and Figure 5 In this embodiment, the third circumferential surface 101, the first step surface 102, the fourth circumferential surface 103, and the second step surface 104 are all arc surface structures, and are smoothly connected to each other through arc surface structures.

[0054] The outer circumferential surface of the ball bearing 100 is spherical. The third circumferential surface 101, the first step surface 102, the fourth circumferential surface 103, and the second step surface 104 are connected in sequence to form the spherical surface of the ball bearing 100. The third circumferential surface 101, the first step surface 102, the fourth circumferential surface 103, and the second step surface 104 are all arc surfaces, and the connection position also adopts an arc surface structure, which can better fit with the bearing hole 210, while reducing limit wear and extending the service life of the ball bearing 100.

[0055] Reference Figure 4 and Figure 5 In this embodiment, the eccentric shaft hole 120 is quadrilateral, and adjacent edges are connected by rounded transitions. The quadrilateral shape of the eccentric shaft hole 120 limits the circumferential rotation of the main square tube 13 of the photovoltaic module 20, and the rounded transition connection reduces the installation difficulty between the main square tube 13 of the photovoltaic module 20 and the eccentric shaft hole 120. In addition, the quadrilateral eccentric shaft hole 120 with rounded corners is easy to process. Furthermore, the quadrilateral shape of the eccentric shaft hole 120 with rounded corners can also increase the area occupied by the eccentric shaft hole 120 in the ball bearing 100, thereby improving the stability of the installation and rotation of the main square tube 13 of the photovoltaic module 20.

[0056] Reference Figure 4 and Figure 5 In this embodiment, the area of ​​the eccentric shaft hole 120 coincides with the projection of the central axis of the ball bearing 100 onto a cross section perpendicular to the axial direction of the eccentric shaft hole 120. That is, the center of the ball bearing 100 falls within the eccentric shaft hole 120, which can improve the stability of the installation of the main square tube 13 of the photovoltaic module 20.

[0057] Reference Figure 3 In this embodiment, the bearing housing 200 includes a first housing and a second housing. The first housing has a first bearing hole 210, and the second housing has a second bearing hole 210. The first housing and the second housing are detachably connected. When the first housing and the second housing are assembled, the first bearing hole 210 and the second bearing hole 210 form the bearing hole 210. The first housing and the second housing are respectively installed on the outer periphery of the ball bearing 100 from both ends, thereby limiting the axial movement of the ball bearing 100 and allowing the ball bearing 100 to rotate between the first bearing hole 210 and the second bearing hole 210.

[0058] Reference Figure 1 , Figure 7 and Figure 8 The present invention also provides a photovoltaic tracking bracket 10. The photovoltaic tracking bracket 10 includes a column 11, a main square tube 13 and an eccentric spherical limiting bearing 12; the main square tube 13 is rotatably mounted on the column 11 through the eccentric spherical limiting bearing 12.

[0059] The bearing housing 200 is mounted on the column 11, and the ball bearing 100 is mounted inside the bearing housing 200; the photovoltaic module 20 is mounted on the main square tube 13, and both ends of the main square tube 13 pass through the eccentric shaft hole 120 to complete the installation of the photovoltaic module 20.

[0060] According to the embodiment of the eccentric spherical limiting bearing 12, the working principle of the eccentric spherical limiting bearing 12 includes: by increasing the external surface constraint of the bearing structure at the limit position, and adding two stop surfaces of the POM bearing, the tracking bracket limiting structure can be realized, and by increasing the bearing size, the eccentric shaft hole 120 is set eccentrically.

[0061] Specifically, the photovoltaic support structure has a movement range of ±60°, and the limit bearings also have a movement range of 60°. Each bearing point cannot rotate further at 60°, effectively creating a locking point. All supports at 60° form multiple locking states at each bearing point, resulting in stronger wind resistance and allowing for smaller main beam pipe specifications, thus reducing costs. Locking at 60° at each point improves the flatness and aesthetics of the support structure, ensuring each point is at a 60° angle. This reduces the distance between the photovoltaic modules (20 panels) and the rotation point, decreasing the gravitational torque T. Reduced torque leads to faster rotation, allowing the photovoltaic support structure to rotate more quickly and reach its protective position more rapidly during strong winds. Reduced torque also lowers power requirements, resulting in greater energy savings.

[0062] In addition, the eccentric spherical limit bearing 12 is made of POM engineering plastic. POM, polyoxymethylene, also known as polyoxymethylene or acetal, is a thermoplastic engineering plastic with high rigidity, wear resistance and low coefficient of friction.

[0063] The eccentric spherical limiting bearing 12 provided in this embodiment has at least the following advantages:

[0064] The outer circumferential surface of the ball bearing 100 is provided with a circumferential limiting part 110, and the bearing hole 210 of the bearing housing 200 is provided with a circumferential stop part 220. Through the cooperation of the circumferential limiting part 110 and the circumferential stop part 220, the circumferential rotation angle of the ball bearing 100 is limited. The limiting is achieved with a low-cost and simple structure, while retaining the unique adjustment advantage of the ball bearing 100. In addition, the main square tube 13 is directly eccentrically set inside the ball bearing 100 through the shaft hole. The photovoltaic module 20 can be installed on the side of the main square tube 13 closer to the rotation center of the ball bearing 100, thereby reducing the distance between the photovoltaic module 20 and the rotation point, reducing torque, and increasing the rotation speed. When strong winds occur, it can rotate back to the protection position more quickly.

[0065] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An eccentric spherical limiting bearing for mounting a main square tube of a photovoltaic module, wherein the main square tube is used to mount the photovoltaic module, characterized in that, The eccentric spherical limiting bearing includes: A ball bearing, wherein the outer circumferential surface of the ball bearing is spherical and a circumferential limiting part is provided on the outer circumferential surface of the ball bearing; an eccentric shaft hole is provided in the middle of the ball bearing, the central axis of the eccentric shaft hole is offset from the central axis of the ball bearing, and the eccentric shaft hole is used to install a main square tube; The bearing housing has a bearing hole for rotatably mounting a ball bearing. A circumferential stop is provided in the bearing hole for resisting the circumferential limiting part during the rotation of the ball bearing to stop the rotation of the ball bearing.

2. The eccentric spherical limiting bearing according to claim 1, characterized in that: The circumferential stop portion includes a first stop surface and a second stop surface that are circumferentially spaced along the bearing hole. The circumferential limiting portion is slidably disposed between the first stop surface and the second stop surface. The first stop surface and the second stop surface are used to stop the circumferential rotation of the circumferential limiting portion.

3. The eccentric spherical limiting bearing according to claim 2, characterized in that: The bearing hole includes a first circumferential surface and a second circumferential surface, and the first circumferential surface, the first stop surface, the second circumferential surface and the second stop surface are connected in sequence; wherein, the first circumferential surface is closer to the central axis of the bearing hole than the second circumferential surface, and the first stop surface and the second stop surface extend radially along the bearing hole, and the first stop surface, the first circumferential surface and the second stop surface form the circumferential stop portion.

4. The eccentric spherical limiting bearing according to claim 3, characterized in that: The first circumferential surface, the first stop surface, the second circumferential surface, and the second stop surface are all arc-shaped structures, and are smoothly connected to each other through arc-shaped structures.

5. The eccentric spherical limiting bearing according to claim 3, characterized in that: The circles corresponding to the first circumferential surface and the circles corresponding to the second circumferential surface are concentric circles.

6. The eccentric spherical limiting bearing according to any one of claims 2-5, characterized in that: The outer circumferential surface of the ball bearing includes a third circumferential surface, a first stepped surface, a fourth circumferential surface, and a second stepped surface connected in sequence; wherein, the third circumferential surface is closer to the central axis of the ball bearing than the fourth circumferential surface, the first stepped surface and the second stepped surface extend radially along the ball bearing, and the first stepped surface, the fourth circumferential surface and the second stepped surface form the circumferential limiting portion, the first stepped surface is used to abut against or separate from the first stop surface during the rotation of the ball bearing, and the second stepped surface is used to abut against or separate from the second stop surface during the rotation of the ball bearing.

7. The eccentric spherical limiting bearing according to claim 6, characterized in that: The third circumferential surface, the first step surface, the fourth circumferential surface, and the second step surface are all arc-shaped structures, and are smoothly connected to each other through arc-shaped structures.

8. The eccentric spherical limiting bearing according to any one of claims 2-5, characterized in that: The eccentric shaft hole is quadrilateral, and adjacent edges are connected by rounded transitions.

9. The eccentric spherical limiting bearing according to claim 8, characterized in that: The area of ​​the eccentric shaft hole coincides with the projection of the central axis of the ball bearing onto a section perpendicular to the axial direction of the eccentric shaft hole.

10. A photovoltaic tracking bracket, characterized in that, The photovoltaic tracking bracket includes a column, a main square tube, and an eccentric spherical limiting bearing as described in any one of claims 1-9; the main square tube is rotatably mounted on the column via the eccentric spherical limiting bearing.

Images