Bearing device for main shaft of solar tracking system

Abstract

The present invention relates to a bearing device for a main shaft of a solar tracking system, comprising: a sleeve-shaped housing; the bearing is mounted in the shell and rotates around the central axis relative to the inner wall of the shell, and a mounting groove is formed in the inner wall of the bearing; the main shaft axially penetrates through the bearing and is mounted in the mounting groove, and the main shaft and the bearing synchronously rotate around the central axis relative to the shell; on the cross section perpendicular to the central axis, the outline of the inner wall of the shell is in an oval shape, the outline of the outer wall of the bearing is a part of a circle, the diameter of the circle is smaller than the length of the long axis of the oval shape and larger than the length of the short axis of the oval shape, and when the bearing rotates around the central axis, the diameter of the circle is smaller than the length of the long axis of the oval shape. The outer wall of the bearing abuts against the inner wall of the shell, so that self-locking of the main shaft is achieved. The outer wall of the circular bearing and the inner wall of the oval shell move relatively to generate interference, the self-locking function of rotation of the main shaft is achieved, and the structure is simple and not prone to damage.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic bearings, and in particular to a main shaft bearing device for a solar tracking system. Background Art

[0002] In the related art, solar tracking systems (also known as solar photovoltaic systems) usually use a bracket structure to install solar photovoltaic arrays (i.e. solar panels), especially large-area solar photovoltaic arrays. The bracket structure can generally fix the solar photovoltaic array so that the solar photovoltaic array can work for a long time. When using the bracket structure for installation, the bracket structure needs to be installed on the main shaft.

[0003] In order to enable the main shaft to drive the support structure to track the direction of the sun, a main shaft bearing device is needed to support the main shaft and drive the main shaft to rotate. However, solar tracking systems are usually used outdoors and need to be used for a long time. During long-term outdoor use, the main shaft bearing device is easily damaged or loosened, so that the bearing device fails and cannot accurately track the sun.

[0004] In the related art, the rotation angle of the bearing is usually limited by passing the locking pin through the limiting groove of the housing and the outer wall of the bearing. However, the locking pin and the housing are fixed by interference fit. Under long-term outdoor working conditions, the locking pin is easy to loosen relative to the housing and fall off due to factors such as repeated collisions with the bearing, which easily leads to failure of the limitation of the bearing rotation angle. In other related technologies, the rotation angle of the bearing can also be controlled by a control system. However, control by the control system requires the arrangement of redundant cables, which is complex in structure, high in cost and easy to fail. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the present invention provides a bearing device for a main shaft of a solar tracking system.

[0006] According to a first aspect of an embodiment of the present invention, the present invention provides a bearing device for a main shaft of a solar tracking system, comprising: a shell, which is in a sleeve shape; a bearing, which is installed in the shell and rotates around a central axis relative to an inner wall of the shell, and the inner wall of the bearing is provided with a mounting groove; and a main shaft, which axially passes through the bearing and is installed in the mounting groove, and is used to rotate around the central axis relative to the shell synchronously with the bearing; wherein, on a cross section perpendicular to the central axis, the contour of the inner wall of the shell is an ellipse, and the contour of the outer wall of the bearing is a part of a circle, the diameter of the circle is smaller than the length of the major axis of the ellipse and larger than the length of the minor axis of the ellipse, and when the bearing rotates around the central axis, the outer wall of the bearing abuts against the inner wall of the shell to achieve self-locking of the main shaft.

[0007] In some embodiments, the shell includes: a first shell; and a second shell, the second shell is separated from the first shell along the major axis direction of the ellipse, and is detachably fixedly connected to the first shell by a fastener.

[0008] In some embodiments, the main shaft bearing device further includes a base, which is disposed on a side of the first shell away from the second shell and is integrally formed with the first shell.

[0009] In some embodiments, the second shell is provided with a slot, and the slot penetrates the second shell axially and radially.

[0010] In some embodiments, in an axial cross section, the inner wall of the housing is arc-shaped, and the outer wall of the bearing is arc-shaped to match the inner wall of the housing, so as to enable the bearing to swing relative to the housing.

[0011] In some embodiments, along the short axis direction of the shell, the actual longitudinal length of the bearing is smaller than the length of the short axis, and the bearing is symmetrically provided with contact parts along the short axis for abutting against the inner wall of the shell to limit the rotation angle of the bearing.

[0012] In some embodiments, the bearing includes at least two sub-bearings, and the sub-bearings are symmetrically arranged along the central axis. A sub-mounting groove is arranged on the radial inner side of each sub-bearing, and a plurality of the sub-mounting grooves are combined to form the mounting groove.

[0013] In some embodiments, the bearing includes two sub-bearings or four sub-bearings.

[0014] In some embodiments, the bearing is made of POM or UPE polymer material.

[0015] In some embodiments, the cross-sectional profile of the mounting groove is a triangle, a quadrilateral, or a polygon, and the cross-sectional profile of the main shaft matches the cross-sectional profile of the mounting groove.

[0016] The technical solution provided by the embodiments of the present invention may include the following beneficial effects: the contour of the outer wall of the bearing is part of a circle, and the diameter of the circle is between the major axis and the minor axis of the elliptical shell. When the bearing rotates relative to the shell along the central axis, part of the outer wall of the bearing cannot exceed the minor axis position of the shell, so that the bearing interferes with or abuts against the inner wall of the shell to limit the bearing from driving the main shaft to rotate relative to the shell, thereby realizing the self-locking function of the main shaft. Compared with the related art in which the rotation angle is controlled by a control system, the present invention has a simple structure and does not require electronic control. In addition, it avoids the disadvantages of the related art in which the rotation angle of the bearing is limited by a locking pin, which leads to the entire bearing device having many parts and components and is easy to loosen and fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] Figure 1 is a perspective view of a main shaft bearing device according to a first exemplary embodiment;

[0019] Figure 2 yes Figure 3 A schematic diagram of a cross section AA of a main shaft bearing device;

[0020] Figure 3 yes Figure 2 A schematic diagram of the axial section BB of the main shaft bearing device;

[0021] Figure 4 yes Figure 1 A schematic diagram of the main shaft bearing device abutting against the inner wall of the housing when rotating in a first direction;

[0022] Figure 5 yes Figure 1 A schematic diagram of the main shaft bearing device abutting against the inner wall of the housing when rotating in the second direction;

[0023] Figure 6 yes Figure 1 A schematic diagram of the rotation angle of the bearing of the main shaft bearing device relative to the housing;

[0024] Figure 7 is a schematic cross-sectional view AA of a main shaft bearing device according to a second exemplary embodiment;

[0025] Figure 8 is a schematic diagram of an axial cross section BB of a main shaft bearing device according to a second exemplary embodiment;

[0026] Fig. 9 yes Figure 7 A schematic diagram of the main shaft bearing device abutting against the inner wall of the housing when rotating in a first direction;

[0027] Fig.10 yes Figure 7 A schematic diagram of the main shaft bearing device abutting against the inner wall of the housing when rotating in the second direction;

[0028] Fig.11 yes Figure 7 A schematic diagram of the rotation angle of the bearing of the main shaft bearing device relative to the housing;

[0029] Fig.12 is a perspective view of a main shaft bearing device according to a third exemplary embodiment. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0031] In the present invention, unless otherwise specified, the axial direction A and the radial direction R refer to the axial direction and the radial direction of the main shaft bearing device 100, respectively; the radial outer side refers to the side away from the main shaft bearing device 100 in the radial direction. Figure 3 The radial inner side refers to the side of the central axis O in the radial direction, and the radial inner side refers to the side close to the central axis O in the radial direction. In addition, the term "torsion-resistant connection" refers to the connection between two elements in a manner that they do not rotate relative to each other, which can be achieved through a press fit (i.e., an interference fit) or by forming the two mentioned components integrally. 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.

[0032] The main shaft bearing device of the solar tracking system generally includes a housing 10, a bearing 20 and a main shaft 30. The bearing 20 and the main shaft 30 rotate synchronously relative to the housing 10 along the central axis O, so that the support structure located on the main shaft drives the solar panel to rotate, thereby realizing tracking and precise positioning of the sun. In the process of synchronous rotation of the bearing 20 and the main shaft 30, the rotation angle θ of the bearing 20 also needs to be limited.

[0033] In order to solve the above technical problems in the related art, the present invention provides a main shaft bearing device 100 of a solar tracking system, such as Figure 1 As shown, the main shaft bearing device 100 includes a housing 10 , a bearing 20 , and a main shaft 30 .

[0034] The shell 10 is in the shape of a sleeve, and the bearing 20 is installed in the shell 10. The bearing 20 can rotate around the central axis O relative to the inner wall of the shell 10. The inner wall of the bearing 20 (that is, the radial inner side of the bearing 20) is provided with a mounting groove 22. The main shaft 30 axially passes through the shell 10 and the bearing 20. The main shaft 30 is installed in the mounting groove 22 with clearance fit. The main shaft 30 can move axially relative to the bearing 20 and can be installed and disassembled in a direction, but in the circumferential direction, the main shaft 30 is torsionally connected to the bearing 20 through the mounting groove 22. The main shaft 30 and the bearing 20 rotate synchronously around the central axis O relative to the shell 10, so that the solar tracking system can drive the main shaft 30 or the solar panel (not shown in the figure) to rotate more accurately, better track the sun to achieve maximum utilization of solar energy and energy conversion.

[0035] Furthermore, if Figure 2 As shown, on the cross section AA perpendicular to the central axis O, Figures 4 to 6 or Figures 9 to 11 As shown, the contour of the inner wall of the housing 10 is an ellipse, and the contour of the outer wall of the bearing 20 is a part of a circle. The diameter L3 of the circle is smaller than the length of the major axis L1 of the ellipse and larger than the length of the minor axis L2 of the ellipse. When the bearing 20 rotates around the central axis O, the outer wall of the bearing 20 abuts against the inner wall of the housing 10, thereby limiting the rotation angle of the bearing 20.

[0036] Specifically, in the cross section AA, the actual contour of the inner wall of the housing 10 is a complete ellipse, while the actual contour of the outer wall of the bearing 20 is not a complete circle, but a part of a circle. Figure 4 and Fig. 9 As shown, the bearing 20 includes an actual longitudinal length L4, wherein the actual longitudinal length L4 of the transverse axis 20 is smaller than the circular diameter L3 and smaller than the length of the short axis L2 of the housing 10. Since the diameter L3 of the circle where the outer wall contour of the bearing 20 is located is smaller than the length of the long axis L1 of the housing 10, the bearing 20 can be installed in the housing 10 and rotate around the central axis O relative to the housing 10 at a preset angle.

[0037] According to an embodiment of the present invention, the first direction in which the bearing 20 rotates relative to the housing 10 is indicated by an arrow D1, and the second direction in which the bearing 20 rotates relative to the housing 10 is indicated by an arrow D2. Figure 4 , Figure 5 as well as Fig. 9 , Fig.10 The positional relationship is described by taking the specific figure shown as an example. The bearing 20 is bilaterally symmetrical with the minor axis L2 of the ellipse as the symmetry line.

[0038] like Figure 4 or Fig. 9 As shown, when the bearing 20 rotates in the first direction D1, the cross-sectional profile is Figure 4 The upper part of the left bearing, the lower part of the right bearing, or Fig. 9 The upper part of the upper left bearing and the lower part of the lower right bearing gradually approach the inner wall of the shell 10. Since the diameter L3 of the circle where the outer wall of the bearing 20 is located is greater than the length of the short axis L2 of the shell, when the bearing 20 continues to rotate in the first direction D1, it will abut against the inner wall of the shell 10, so that the bearing 20 is stuck by the shell 10 and cannot continue to rotate in the first direction D1, thereby realizing self-locking of the main shaft 30. This position is the maximum angle of rotation of the bearing 20 in the first direction D1, the position where the outer wall of the bearing 20 is equal to the diameter L3, and the position in contact with the inner wall of the shell 10 can be defined as the contact portion 23 of the bearing 20.

[0039] Similarly, when the bearing 20 rotates in the second direction D2, Figure 5 or Fig.10 As shown, in the cross-sectional profile, Figure 5 The upper part of the right bearing, the lower part of the left bearing, or Fig.10 The upper part of the upper right bearing and the lower part of the lower left bearing gradually approach the inner wall of the shell 10. Since the diameter L3 of the circle where the outer wall of the bearing is located is greater than the length of the short axis L2 of the shell, when the bearing 20 continues to rotate in the second direction D2, it will abut against the inner wall of the shell 10, so that the bearing 20 is stuck by the shell 10 and cannot continue to rotate in the second direction D2. This position is the maximum angle of rotation of the bearing 20 in the second direction D2. The position where the outer wall of the bearing is equal to the diameter L3 and the position in contact with the inner wall of the shell 10 can be defined as another contact portion 23 of the bearing 20.

[0040] It can be seen that at least two contact portions 23 of the bearing 20 symmetrical along the minor axis L2 are used to abut against the inner wall of the housing 10 to limit the rotation angle θ of the bearing 20 (such as Figure 6 Hehe Fig.11 As shown), and realize the self-locking function of the main shaft 30. Among them, the size of the rotation angle θ depends on the size of the actual longitudinal length L4 of the bearing 20, and can be set accordingly according to the design requirements, and is not specifically limited here.

[0041] It can be seen from the above content that compared with the related art in which the self-locking function is realized by controlling the rotation angle through a control system, the present invention sets a circular outer wall of the bearing 20 and an elliptical inner wall of the housing 10, and the circular diameter L3 is between the major axis L1 and the minor axis L2 of the ellipse. During the rotation of the bearing 20 relative to the housing 10 along the center axis O, the contact portion 23 of the bearing 20 cannot pass the position of the minor axis L2 of the housing, so that the bearing 20 interferes with or abuts the inner wall of the housing 10 to limit the bearing 20 from driving the main shaft 30 to rotate relative to the housing 10, thereby realizing the self-locking function of the main shaft 30. The present invention has a simple structure and can meet the needs of long-term outdoor use. It does not require an electric control system and avoids the redundant cables generated by the use of an electric control system. The cost is low and it is not easy to fail.

[0042] In addition, the outer wall of the bearing 20 of the present invention does not need to be provided with a limit groove, nor does it need to be provided with a locking pin that passes through the shell 10 and is interference fit with the shell 10. Therefore, it avoids the disadvantage of the related art that the bearing 20 is self-locking by limiting the rotation angle θ by a locking pin, which leads to the entire bearing 20 device having many parts and is easy to loosen and fail.

[0043] Further, in some embodiments, on the axial section BB, as Figure 3 and Figure 8As shown, the inner wall of the shell 10 is an arc, and the outer wall of the bearing 20 is an arc that matches the inner wall of the shell 10. Therefore, from a three-dimensional perspective, the outer wall of the bearing 20 is a part of the spherical body. The inner wall of the shell 10 and the outer wall of the bearing 20 are matched through an arc, so that the bearing 20 can swing relative to the shell 10.

[0044] In this way, when the bearing 20 can rotate relative to the housing 10 around the central axis O, the bearing 20 can also swing relative to the housing 10, so that the position of the solar panel of the bracket structure on the main shaft 30 can be adjusted, so that it can track the sun more accurately and achieve maximum energy conversion. At the same time, the arc-shaped inner wall of the housing 10 can limit the bearing 20 from coming out along both ends of the axial direction, making the combination of the housing 10 and the bearing 20 more firm and durable.

[0045] In one embodiment, the bearing 20 can be integrally formed, and the outer wall of the bearing 20 can be D-shaped in profile on the cross section AA, that is, one side of the bearing 20 is a plane, or one side of the bearing 20 is recessed radially inward to form a groove, so that the actual longitudinal length L4 of the bearing 20 is smaller than the diameter L3 of the circle, and is also smaller than the length of the short axis L2 of the housing. At this time, the bearing 20 has two contact portions 23, which are respectively located at the two ends of the plane or the groove extending along the direction of the long axis L1, and the two contact portions 23 are symmetrical relative to the short axis L2.

[0046] In another embodiment, on the cross section AA, the outer wall of the bearing 20 may have a drum-shaped profile, that is, the two opposite sides of the bearing 20 are planes, or the two opposite sides of the bearing 20 are recessed radially inward to form a groove. In this case, the bearing 20 may have four contact portions 23 symmetrical with respect to the minor axis L2 and the major axis L1, and the four contact portions 23 are respectively located at the two ends of the plane or the groove extending in the direction of the major axis L1.

[0047] The integrally formed bearing 20 can be produced by a casting process, and the cast bearing 20 directly forms a mounting groove 22 for mounting the main shaft 30, so that the number of parts, the process difficulty and the installation difficulty can be reduced. In addition, the integrally formed bearing 20 cannot be installed in Fig.12 The housing 10 having the notch 121 needs to be installed and matched with the upper and lower split housing 10.

[0048] It should be noted that, from a three-dimensional perspective, the contact portion 23 may be an arc-shaped edge extending along the axial direction A, and a chamfer may be provided at the edge, so as to avoid wear between the bearing 20 and the inner wall of the housing 10 and extend the service life.

[0049] In some embodiments, the cross-sectional profile of the mounting groove 22 may be a triangle, a quadrilateral, or a polygon, and the cross-sectional profile of the spindle 30 matches the cross-sectional profile of the mounting groove 22. The polygon may be a pentagon, a hexagon, or even an octagon, which is not limited here. The polygonal spindle 30 has edges and corners, and is not easy to slip when matching with the polygonal mounting groove 22, thereby avoiding the situation where the spindle 30 and the bearing 20 cannot rotate synchronously due to slippage, thereby affecting the tracking accuracy.

[0050] In some embodiments, the bearing 20 may be a split structure, that is, the bearing 20 includes at least two sub-bearings 20, and the sub-bearings 20 may be symmetrically arranged along the central axis O. A sub-mounting groove is arranged on the radial inner side of each sub-bearing 20, and a plurality of sub-mounting grooves are combined to form a mounting groove for mounting the main shaft 30. The split bearing 20 is not only easy to install into the housing 10, but also the structure of part of the bearing 20 can be omitted at a position where no load is required, thereby reducing material costs.

[0051] In one embodiment of the present invention, Figure 2 As shown, the bearing 20 includes two sub-bearings 21, the two sub-bearings 21 have the same structure and are symmetrically arranged, the opposite end faces of the two sub-bearings 21 are spaced apart and not adjacent, and the opposite end faces of the two sub-bearings 21 are respectively provided with sub-mounting grooves.

[0052] In another embodiment of the present invention, Figure 7 As shown, the bearing 20 includes four sub-bearings 21, which have the same structure and are centrally symmetrical. Sub-mounting grooves 221 are respectively provided on the radial inner sides of the four sub-bearings 21. In this embodiment, the cross-section of the sub-mounting grooves 221 can be triangular, which is used to cooperate with the four corners of the square main shaft 30 to fix the square main shaft 30 circumferentially.

[0053] It should be noted that Figure 2 and Figure 7 The number of components of the bearing 20 shown is only exemplary and is not intended to limit the scope of protection of the present invention. The bearing 20 can be divided into three, five, etc. sub-bearings 20 according to different load-bearing areas. For example, when the bearing 20 includes three sub-bearings 20, the cross-sectional shape of the corresponding main shaft 30 can also be a triangle, which is not specifically limited here.

[0054] Furthermore, in some embodiments, the bearing 20 is made of polyoxymethylene (POM for short) or ultra-high molecular polyethylene (UPE for short), and the housing 10 is made of a metal material, preferably a stamped steel plate. The bearing 20 made of POM or UPE has a self-lubricating effect. The principle is that the contact and friction between the polymer material and the steel part will produce many polymer particles, which will play a lubricating role in the subsequent wear process. When the bearing 20 rotates relative to the housing 10, the bearing 20 made of POM or UPE and other materials with self-lubricating function can avoid being stuck with the inner wall of the housing 10, thereby improving the smoothness of the rotation.

[0055] In some embodiments, the housing 10 may include a first housing 11 and a second housing 12. The housing 10 that is arranged separately is convenient for assembly with the bearing 20. In this embodiment, the second housing 12 is separated from the first housing 11 along the direction of the major axis L1 of the ellipse, and is detachably fixedly connected to the first housing 11 by fasteners. In some other embodiments, the second housing 12 may also be separated from the first housing 11 along the direction of the minor axis of the ellipse, or the first housing 11 and the second housing 12 may also be separated along the plane where the axis other than the minor axis L2 or the major axis L1 is located.

[0056] It is understood that the terms "first" and "second" are only used to distinguish structures of the same type from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first" and "second" can be used interchangeably. For example, without departing from the scope of the present invention, the first housing 11 can also be referred to as the second housing 12, and similarly, the second housing 12 can also be referred to as the first housing 11.

[0057] In some embodiments, the spindle bearing device 100 further includes a base 40, which is integrally formed with the housing 10. In this embodiment, the base 40 is disposed on a side of the first housing 11 away from the second housing 12, and is integrally formed with the first housing 11, so that the strength of the first housing 11 can be increased, and the number of parts and the installation process can also be reduced. The base 40 is used to support the housing 10 and the bearing 20 and spindle 30 in the housing 10, and the base 40 is used to install the entire spindle 30 bearing 20 device on a structure such as a column (not shown in the figure).

[0058] In some embodiments, Fig.12 As shown, the housing 10 is provided with a notch 121, which axially and radially penetrates the housing 10. In this embodiment, the notch 121 may be located on the second housing 12, and the second housing 12 is provided with the notch 121 to facilitate the installation of the bearing 20.

[0059] It should be further understood that the terms "center", "axial", "lateral", "up", "down", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0060] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0061] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A main shaft bearing device (100) for a solar tracking system, characterized in that: include: A housing (10), wherein the housing (10) is in a sleeve shape; A bearing (20) is installed in the housing (10) and rotates around a central axis relative to an inner wall of the housing (10), and an inner wall of the bearing (20) is provided with a mounting groove (22); and A main shaft (30) axially passes through the bearing (20) and is installed in the installation groove (22), and is used to rotate synchronously with the bearing (20) relative to the housing (10) around the central axis; In which, in a cross section perpendicular to the central axis, the contour of the inner wall of the housing (10) is an ellipse, and the contour of the outer wall of the bearing (20) is a portion of a circle, the diameter of the circle is smaller than the length of the major axis (L1) of the ellipse, and larger than the length of the minor axis (L2) of the ellipse, and when the bearing (20) rotates around the central axis (O), the outer wall of the bearing (20) abuts against the inner wall of the housing (10), thereby achieving self-locking of the main shaft (30).

2. The main shaft bearing device (100) for a solar tracking system according to claim 1, characterized in that: The housing (10) comprises: a first housing (11); and A second shell (12), the second shell (12) is separated from the first shell (11) along the direction of the major axis (L1) of the ellipse, and is detachably fixedly connected to the first shell (11) via a fastener.

3. The main shaft bearing device (100) for a solar tracking system according to claim 2, characterized in that: The main shaft bearing device (100) further comprises a base (40), wherein the base (40) is arranged on a side of the first shell (11) away from the second shell (12) and is integrally formed with the first shell (11).

4. The main shaft bearing device (100) for a solar tracking system according to claim 1, characterized in that: The second shell (12) is provided with a notch (121), and the notch (121) penetrates the second shell (10) axially and radially.

5. The main shaft bearing device (100) for a solar tracking system according to claim 1, characterized in that: In an axial cross section, the inner wall of the housing (10) is arc-shaped, and the outer wall of the bearing (20) is arc-shaped to match the inner wall of the housing (10), so as to enable the bearing (20) to swing relative to the housing (10).

6. The main shaft bearing device (100) for a solar tracking system according to claim 1, characterized in that: Along the direction of the minor axis (L2) of the housing (10), the actual longitudinal length (L4) of the bearing (20) is smaller than the length of the minor axis (L2), and the bearing (20) is symmetrically provided with contact portions (23) along the minor axis (L2) for abutting against the inner wall of the housing (10) to limit the rotation angle (θ) of the bearing (20).

7. The main shaft bearing device (100) for a solar tracking system according to claim 1, characterized in that: The bearing (20) comprises at least two sub-bearings (21), the sub-bearings (21) being symmetrically arranged along the central axis, a sub-mounting groove (221) being arranged on the radial inner side of each sub-bearing (21), and a plurality of the sub-mounting grooves (221) enclosing each other to form the mounting groove (22).

8. The main shaft bearing device (100) of the solar tracking system according to claim 7, characterized in that: The bearing (20) includes two sub-bearings (21) or four sub-bearings (21).

9. The main shaft bearing device (100) for a solar tracking system according to claim 1, characterized in that: The bearing (20) is made of POM or UPE polymer material.

10. The main shaft bearing device (100) of the solar tracking system according to claim 1, characterized in that: The profile of the cross section of the installation groove (22) is a triangle, a quadrilateral or a polygon, and the profile of the cross section of the main shaft (30) matches the profile of the cross section of the installation groove (22).

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