A stable torque transmission system of a photovoltaic tracking support

Abstract

This invention discloses a stable torque transmission system for a photovoltaic tracking bracket, comprising a main shaft, a circular tube synchronous shaft, a torque transmission connecting sleeve, an inner reinforcing member, and a flexible limiting structure. The end of the circular tube synchronous shaft is locally shaped to form a shaped torque transmission section including a shaped torque transmission area and an arc-shaped stabilizing area retaining the original circular tube's outer arc contour. The torque transmission connecting sleeve is fitted onto the outer wall of the shaped torque transmission sections of two adjacent circular tube synchronous shafts to achieve torque transmission between the synchronous shafts through surface-to-surface mating. The inner reinforcing member is disposed inside the shaped torque transmission section to enhance the local strength and anti-instability capability when the end is connected to the reducer. The flexible limiting structure is connected between the main shaft and the circular tube synchronous shaft to limit the radial displacement of the synchronous shaft and allow it to rotate relative to the main shaft. This invention balances the stable torque transmission of the shaped surface with the stability of the circular tube structure, reducing off-center wear in the connection area and improving the long-term operational reliability of the system.

Description

Technical Field

[0001] This invention relates to the field of mechanical linkage transmission technology for photovoltaic tracking brackets, specifically a stable torque transmission system for photovoltaic tracking brackets. Background Technology

[0002] In the mechanical linkage system of photovoltaic tracking brackets, synchronous shafts are typically used to synchronize the transmission of torque and angular displacement between multiple bracket sets, ensuring the consistency and stability of the entire row of brackets. Existing synchronous shafts mostly adopt a circular tube connection structure, which has advantages such as light weight, high material utilization, and convenient processing. However, the following problems still exist during long-term operation:

[0003] Firstly, traditional synchronous shafts typically use perforated connections, pin connections, or bolts to withstand shear loads for torque transmission. Under long-term alternating loads, these connection structures are prone to problems such as increased connection gaps, wear at the connection ends, and insufficient torque transmission stability, affecting the system's synchronization accuracy and operational reliability.

[0004] Secondly, to improve the anti-rotation capability of the ends, some solutions adopt integral irregular structures or large-area flattened and shaped structures. However, such solutions easily disrupt the original cross-sectional continuity of the circular tube, causing stress concentration in the end area and reducing the original structural stability of the circular tube. Under long-term alternating load conditions, the ends are prone to local deformation and fatigue damage, endangering the safe operation of the system.

[0005] Furthermore, during long-term operation, synchronous shafts are prone to deflection, swaying, and vibration due to factors such as their own weight, wind loads, and alternating loads. Since the ends of synchronous shafts typically employ a surface-fit torsion transmission structure, deflection can easily lead to eccentric loading in the connection area, exacerbating localized wear on irregular surfaces, further increasing the connection gap and reducing connection stability.

[0006] Therefore, how to ensure stable torque transmission on irregular surfaces while also taking into account the stability of the circular tube structure and reducing off-center wear in the connection area during synchronous shaft operation, thereby improving the long-term operational stability of the synchronous shaft system, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] To address the aforementioned shortcomings of existing technologies, this invention combines techniques such as stable torque transmission via irregularly shaped surfaces, stable maintenance via circular tube structures, reinforced inner lining, and flexible limiting to form a stable torque transmission system suitable for photovoltaic tracking brackets. While ensuring efficient and synchronous torque transmission, this system significantly improves fatigue resistance, wear resistance, and displacement resistance, and has the advantages of structural stability, reliable operation, convenient installation, and strong engineering adaptability.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a stable torque transmission system for a photovoltaic tracking bracket, comprising a main shaft and further comprising: a circular tube synchronous shaft, wherein the circular tube synchronous shaft comprises a circular tube main body section and irregularly shaped torque transmission parts integrally formed at both ends of the circular tube main body section; the irregularly shaped torque transmission parts are formed by partial shaping of the ends of the circular tube synchronous shaft, and include at least one irregularly shaped torque transmission area and at least one circular arc stabilizing area retaining the original circular arc outer contour in the circumferential direction, the irregularly shaped torque transmission area having a non-circular irregularly shaped torque transmission surface; a torque transmission connecting sleeve for connecting the irregularly shaped torque transmission parts of two adjacent circular tube synchronous shafts; the torque transmission connecting sleeve is tubular and sleeved on the irregularly shaped torque transmission parts. The outer wall of the shaped torque transmission part has an internal irregularly shaped mating cavity that matches the outer contour of the shaped torque transmission part. Two adjacent irregularly shaped torque transmission parts are respectively inserted into the torque transmission connecting sleeve from both ends. The torque is transmitted between the irregularly shaped torque transmission part and the torque transmission connecting sleeve through the irregularly shaped torque transmission surface mating, and the connection is locked and circumferentially positioned by through bolts. The inner lining reinforcement is set inside the irregularly shaped torque transmission part, and the outer contour of the inner lining reinforcement is adapted to the inner wall of the irregularly shaped torque transmission part. The flexible limiting structure is connected between the main shaft and the circular tube synchronous shaft to flexibly limit the radial displacement of the circular tube synchronous shaft and allow the circular tube synchronous shaft to rotate relative to the main shaft.

[0009] Furthermore, the irregularly shaped torsion transmission part has multiple irregularly shaped torsion transmission zones, which are arranged at intervals in the circumferential direction, and the area between adjacent irregularly shaped torsion transmission zones is the circular arc stabilization zone.

[0010] Furthermore, the irregularly shaped torque transmission part and the torque transmission connecting sleeve have a unique circumferential assembly position. Only when the irregularly shaped torque transmission part and the torque transmission connecting sleeve are circumferentially aligned can the holes through which the through bolts pass be aligned.

[0011] Furthermore, the torque transmission connecting sleeve is an aluminum extrusion molding structure, and the cross-sectional shape of its irregularly shaped mating cavity is consistent with the cross-sectional shape of the outer contour of the irregularly shaped torque transmission part; the torque transmission connecting sleeve is provided with a strip-shaped adjustment hole.

[0012] Furthermore, the inner lining reinforcement is an aluminum alloy part formed by aluminum extrusion, and the inner lining reinforcement is inserted into the irregular torsion transmission part along the axial direction of the synchronous shaft of the round tube; the inner lining reinforcement is fixedly connected to the irregular torsion transmission part by riveting.

[0013] Furthermore, the flexible limiting structure includes: a U-shaped connector, fixedly connected to the clamp on the outside of the main shaft; a wear-resistant sliding limiting member, the lower part of which has a first through hole along the thickness direction for the circular tube synchronous shaft to pass through, so that the circular tube synchronous shaft can rotate freely in the first through hole; the upper part of which has a second through hole along the width direction for the U-shaped connector to pass through to form a sliding fit.

[0014] Furthermore, the U-shaped connector is fixedly installed on the outside of the main shaft by a clamp.

[0015] Furthermore, the wear-resistant sliding limiter is integrally formed from UHMWPE material, and the first through hole is a complete circular hole.

[0016] Furthermore, the flexible limiting structure is provided in multiple portions at intervals along the axial direction of the synchronous shaft of the circular tube.

[0017] Furthermore, the riveting component consists of multiple rivets arranged on opposite sides of the irregularly shaped torsion transmission part.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] 1. The end of the circular tube synchronous shaft is locally shaped to form a composite cross-sectional structure of an irregular torsion transmission zone and a circular arc stabilization zone. The irregular torsion transmission zone transmits torque through surface mating, which changes the traditional torsion transmission path that relies on bolt shear and improves torsion transmission stability. The circular arc stabilization zone retains the original circular arc outer contour and cross-sectional continuity of the circular tube, reducing the risk of stress concentration and fatigue failure caused by abrupt changes in cross-section after end shaping. This gives the circular tube synchronous shaft both efficient torsion transmission and excellent structural retention performance.

[0020] 2. The torque transmission connecting sleeve is fitted onto the outer wall of the ends of two adjacent circular tube synchronous shafts, which is a system connection structure to achieve a stable torque transmission connection between synchronous shafts; the inner lining reinforcement is set inside the end of the circular tube synchronous shaft, which is an end reinforcement structure used to enhance the local structural strength when it is connected to the output end of the reducer.

[0021] 3. The torque is transmitted between the irregularly shaped torque transmission part and the torque transmission connecting sleeve through the surface mating of the irregularly shaped torque transmission surface and the irregularly shaped mating cavity. The through bolt undertakes the connection locking and anti-loosening functions and basically does not bear shear load. This fundamentally reduces the risks of loosening, fatigue fracture and increased connection gap caused by long-term alternating shear load on bolts in traditional structures, and significantly improves the long-term reliability of the system.

[0022] 4. By setting an inner lining reinforcement inside the irregular torsion transmission section, the outer contour of the inner lining reinforcement is adapted to the inner wall of the irregular torsion transmission section, which can effectively support the end shaping area, improve local strength and resistance to local instability; the inner lining reinforcement extends axially into the inner direction of the circular tube body section to form a stiffness transition section, avoiding stress concentration at the abrupt change in cross section; by fixing with riveting, the axial movement and relative rotation of the inner lining reinforcement under long-term vibration can be reliably prevented, ensuring the long-term integrity and stiffness of the end composite structure.

[0023] 5. The flexible limiting structure provides flexible constraint on the radial displacement of the circular tube synchronous shaft without participating in torque transmission; the first through hole of the wear-resistant sliding limiting component allows the synchronous shaft to rotate freely, and the second through hole forms a sliding fit with the U-shaped connector to adapt to the relative slippage between the main shaft and the synchronous shaft. This can effectively suppress the deflection, sway and jump of the circular tube synchronous shaft during operation, thereby significantly reducing the off-center load between the irregular torque transmission part and the torque transmission connecting sleeve, and reducing the risk of local wear on the irregular surface and increased connection gap.

[0024] 6. This invention combines the design of irregular surface for stable torque transmission, circular tube structure for stable maintenance, inner lining reinforcement, and flexible limiting technology to form a stable torque transmission system suitable for photovoltaic tracking brackets. While ensuring efficient and synchronous torque transmission, it significantly improves the system's fatigue resistance, wear resistance, and displacement resistance. It has the advantages of stable structure, reliable operation, convenient installation, and strong engineering adaptability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the stable torque transmission system in this invention.

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0027] Figure 3 This is a schematic diagram of the assembly of the circular tube synchronous shaft, the torque transmission connecting sleeve, and the inner lining reinforcement in this invention.

[0028] Figure 4 This is a schematic diagram of the circular tube synchronous shaft in this invention.

[0029] Figure 5 This is a side view of the circular tube synchronous shaft in this invention.

[0030] Figure 6 This is a schematic diagram of the torsion transmission connecting sleeve in this invention.

[0031] Figure 7 This is a schematic diagram of the inner lining reinforcement in this invention.

[0032] Figure 8 This is an axial side view of the synchronous shaft, torque transmission connecting sleeve, and inner lining reinforcement in this invention.

[0033] Figure 9 This is a schematic diagram of the flexible limiting structure in this invention.

[0034] Figure 10 for Figure 1 Enlarged view of point B in the middle.

[0035] Reference numerals: 1. Main shaft; 2. Round tube synchronous shaft; 21. Round tube main body section; 22. Irregular torsion transmission part; 221. Irregular torsion transmission zone; 222. Circular arc stabilization zone; 3. Torsion transmission connecting sleeve; 31. Irregular mating cavity; 32. Strip-shaped adjustment hole; 33. Through bolt; 4. Inner lining reinforcement; 5. Flexible limiting structure; 51. U-shaped connector; 52. Wear-resistant sliding limiting part; 52. First through hole; 521. Second through hole; 522. Weight reduction hole; 523. Reducer; 6. Riveting part; 7. Clamp; 8. Column; 9. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see the appendix Figure 1-10 As shown, the present invention provides a stable torque transmission system for a photovoltaic tracking bracket, including a main shaft 1, and further comprising:

[0038] Circular tube synchronous shaft 2, as attached Figure 3-5 As shown, the circular tube synchronous shaft 2 includes a circular tube main body section 21 and irregularly shaped torque transmission parts 22 integrally formed at both ends of the circular tube main body section 21; the irregularly shaped torque transmission parts 22 are formed by partial shaping of the ends of the circular tube synchronous shaft 2, and include at least one irregularly shaped torque transmission area 221 and at least one circular arc stabilizing area 222 that retains the original circular tube arc outer contour in the circumferential direction; the irregularly shaped torque transmission area 221 has a non-circular irregularly shaped torque transmission surface.

[0039] Torque transmission connecting sleeve 3, as attached Figure 3 and 6 As shown, a non-circular torque transmission part 22 is used to connect two adjacent circular tube synchronous shafts 2; the torque transmission connecting sleeve 3 is tubular and sleeved on the outer wall of the non-circular torque transmission part 22, and its interior has a non-circular mating cavity 31 that matches the outer contour of the non-circular torque transmission part 22. Two adjacent non-circular torque transmission parts 22 are inserted into the torque transmission connecting sleeve 3 from both ends. The non-circular torque transmission part 22 and the torque transmission connecting sleeve 3 transmit torque through a surface fit between the non-circular torque transmission surface, and the connection is locked and circumferentially positioned by a through bolt 33; the through bolt 33 is used for connection locking and anti-disengagement. The torque between the non-circular torque transmission part 22 and the torque transmission connecting sleeve 3 is mainly transmitted through the surface fit between the non-circular torque transmission surface and the non-circular mating cavity 31.

[0040] Inner lining reinforcement 4, as attached Figure 3 and 7 As shown, it is disposed inside the irregular torsion transmission part 22; the outer contour of the inner lining reinforcement 4 is adapted to the inner wall of the irregular torsion transmission part 22 to enhance the local strength and anti-instability capability of the end.

[0041] Flexible limiting structure 5, as shown in the attached diagram Figure 1 and 2 As shown, it is connected between the main shaft 1 and the circular tube synchronous shaft 2, and is used to flexibly limit the radial displacement of the circular tube synchronous shaft 2, and allow the circular tube synchronous shaft 2 to rotate relative to the main shaft 1.

[0042] Among them, the torque transmission connecting sleeve 3 and the inner lining reinforcement 4 are two types of components with completely different functions. The inner lining reinforcement 4 is set inside the end of the circular tube synchronous shaft 2 and is used to locally reinforce the output end of the reducer 6. The torque transmission connecting sleeve 3 is sleeved on the outer wall of the ends of two adjacent circular tube synchronous shafts 2 and is used to realize a stable torque transmission connection between the circular tube synchronous shafts 2. The two are not the same components, but perform different technical functions in a complete torque transmission system.

[0043] This invention relates to a stable torque transmission system for photovoltaic tracking brackets. Instead of employing a monolithic, full-section irregular structure at the end of the circular tube synchronous shaft 2, a locally shaped torque transmission zone 221 and a circular arc stabilization zone 222 are simultaneously formed at the end of the circular tube synchronous shaft 2. Torque is transmitted via surface mating, changing the traditional torque transmission path that relies on bolt shear. The circular arc stabilization zone 222 preserves the continuity and structural stiffness of the circular tube synchronous shaft 2's cross-section, reducing the risk of stress concentration and fatigue failure. The inner reinforcing member 4 enhances the strength of the weak area at the end of the circular tube synchronous shaft 2, preventing crushing deformation. The flexible limiting structure 5 restricts the radial displacement of the circular tube synchronous shaft 2 without participating in torque transmission, suppressing deflection, sway, and jump at the source, thereby reducing eccentric wear in the connection area and comprehensively improving the long-term stability and reliability of the system.

[0044] In this invention, as shown in the appendix Figure 5 As shown, the irregular torsion transmission section 22 has multiple irregular torsion transmission zones 221, which are arranged at intervals in the circumferential direction to make the torsion force distribution more uniform and the connection more stable. Between adjacent irregular torsion transmission zones 221 is a circular arc stabilization zone 222. The circular arc stabilization zone 222, which is retained at intervals, can maintain the original circumferential stiffness and anti-instability capability of the circular tube synchronous shaft 2 to the maximum extent, so that the circular tube synchronous shaft 2 has both efficient torsion transmission and excellent structural retention performance.

[0045] In this invention, the irregularly shaped torque transmission part 22 and the torque transmission connecting sleeve 3 have a unique circumferential assembly position. Only when the irregularly shaped torque transmission part 22 and the torque transmission connecting sleeve 3 are circumferentially aligned can the hole (strip-shaped adjustment hole 32) through which the through bolt 33 passes be aligned. Setting a unique circumferential assembly position ensures that the irregularly shaped torque transmission part 22 and the torque transmission connecting sleeve 3 can only be inserted after they are completely aligned, thus achieving error-proof installation. This not only ensures the accuracy of the irregular surface fit but also simplifies on-site assembly and alignment, avoiding localized off-center loading and abnormal wear caused by misaligned installation.

[0046] In this invention, as shown in the appendix Figure 6 As shown, the torque-transmitting connecting sleeve 3 is an aluminum extrusion molding structure, and the cross-sectional shape of its irregularly shaped mating cavity 31 is consistent with the outer contour cross-sectional shape of the irregularly shaped torque-transmitting part 22; the torque-transmitting connecting sleeve 3 is provided with a strip-shaped adjustment hole 32. The torque-transmitting connecting sleeve 3 is made of aluminum extrusion molding, which is lightweight and has high strength; the irregularly shaped mating cavity 31 and the irregularly shaped torque-transmitting part 22 have the same cross-sectional shape, ensuring the tightness of the surface fit. The strip-shaped adjustment hole 32 can compensate for on-site construction and installation errors, improving the system's engineering adaptability and installation convenience.

[0047] In this invention, as shown in the appendix Figure 3 and 7 As shown, the inner lining reinforcement 4 is an aluminum alloy part formed by aluminum extrusion. The inner lining reinforcement 4 is inserted into the irregular torsion transmission part 22 along the axial direction of the circular tube synchronous shaft 2. The inner lining reinforcement 4 is fixedly connected to the irregular torsion transmission part 22 by the riveting part 7 to prevent axial movement and relative rotation of the inner lining reinforcement 4. The inner lining reinforcement 4 can effectively support the shaping area of ​​the irregular torsion transmission part 22, improve local strength and resistance to local instability; by extending into the interior of the circular tube synchronous shaft 2 to form a stiffness transition section, stress concentration at the abrupt change in cross-section is avoided. The riveting fixing method can reliably prevent axial movement and relative rotation of the inner lining reinforcement 4 under long-term vibration, ensuring the reinforcement effect is durable and effective. Preferably, the riveting part 7 consists of multiple rivets on opposite sides of the irregular torsion transmission part 22, which are evenly and symmetrically stressed, and can more firmly lock the inner lining reinforcement 4 to the end of the synchronous shaft, effectively preventing loosening under fretting wear, and ensuring the long-term integrity and rigidity of the end composite structure.

[0048] In this invention, as shown in the appendix Figure 2 and 9As shown, the flexible limiting structure 5 includes: a U-shaped connector 51, fixedly connected to the clamp 8 on the outside of the main shaft 1; a wear-resistant sliding limiting member 52, the lower part of which has a first through hole 521 along the thickness direction for the circular tube synchronous shaft 2 to pass through, so that the circular tube synchronous shaft 2 can rotate freely in the first through hole 521; the upper part of which has a second through hole 522 along the width direction for the U-shaped connector 51 to pass through to form a sliding fit, so as to allow relative sliding between the main shaft 1 and the circular tube synchronous shaft 2. The flexible limiting structure 5 consists of a U-shaped connector 51 and a wear-resistant sliding limiting component 52. It has a simple structure and is easy to install. The lower first through hole 521 allows the circular tube synchronous shaft 2 to rotate freely, and the upper second through hole 522 forms a sliding fit with the U-shaped connector 51. It can not only adapt to the relative slippage caused by the rotation of the main shaft 1, but also form a radial flexible limit on the circular tube synchronous shaft 2, effectively limiting its downward deflection, sway and jump, thereby reducing the off-center wear caused by shaft deformation in the connection area.

[0049] Preferably, the wear-resistant sliding limit member 52 has weight-reducing holes 523 on both sides of the middle part.

[0050] In this invention, the U-shaped connector 51 is fixedly installed on the outside of the spindle 1 by a clamp 8. The U-shaped connector 51 is fixed to the spindle 1 by the clamp 8, which ensures reliable connection, convenient assembly and disassembly, and does not damage the spindle 1 body. It also facilitates the later adjustment of the position of the wear-resistant sliding limiter 52 or maintenance and replacement.

[0051] In this invention, the wear-resistant sliding limiter 52 is integrally molded from UHMWPE material. UHMWPE material has excellent self-lubricating and wear-resistant properties, and can maintain low friction and low wear during long-term relative sliding and rotation. The first through hole 521 is a complete circular hole that fits with the outer circle of the circular tube synchronous shaft 2, ensuring smooth rotation and preventing the generation of additional torque.

[0052] In this invention, as shown in the appendix Figure 1 As shown, the flexible limiting structure 5 is provided in multiple segments along the axial direction of the circular tube synchronous shaft 2, forming segmented support for the circular tube synchronous shaft 2. This can more effectively suppress the self-weight deflection and multi-order vibration of the circular tube synchronous shaft 2, and significantly improve the smoothness and stability of the synchronous shaft throughout its entire span.

[0053] As a more specific implementation method, see attached Figure 1-10As shown, the stable torsion transmission system of the photovoltaic tracking bracket includes a main shaft 1, two circular tube synchronous shafts 2, three columns 9, a torsion transmission connecting sleeve 3, two inner reinforcing members 4, and multiple spaced flexible limiting structures 5. The circular tube synchronous shafts 2 are made of standard circular tubes. The irregular torsion transmission section 22 is formed by locally cold extruding or stamping the circular tube synchronous shaft 2 using a mold. This forming is not a full-section flattening, but rather the formation of inward-facing planes at multiple points along the circumference. After forming, four irregular torsion transmission areas 221 and four arc-shaped stabilizing areas 222 are formed alternately in the circumferential direction at the ends: the irregular torsion transmission areas 221 are planar non-circular torsion transmission surfaces, and the four irregular torsion transmission areas 221 roughly form a square outline; between adjacent irregular torsion transmission areas 221 is an arc-shaped stabilizing area 222 that retains the original circular tube arc outer outline. This area is still a continuous arc surface, used to maintain the cross-sectional stiffness and deformation resistance of the circular tube synchronous shaft 2. This composite cross-sectional structure of the irregular torsion transmission zone 221 and the circular arc stabilization zone 222 achieves a balance between the torsion transmission function and structural stability of the circular tube synchronous shaft 2.

[0054] As attached Figure 10 As shown, the irregularly shaped torque transmission section 22 at the outer end of the circular tube synchronous shaft 2 is connected to the output end of the reducer 6 through an inner reinforcing member 4 installed inside it. The inner reinforcing member 4 enhances the local strength and resistance to local instability at this connection point. The irregularly shaped torque transmission sections 22 at the other adjacent ends of the two circular tube synchronous shafts 2 are inserted into a torque transmission connecting sleeve 3, and the torque is synchronously transmitted between them through the mating of the irregular surfaces. Thus, the inner reinforcing member 4 is mainly used to enhance the connection reliability between the end of a single synchronous shaft and the power end (reducer 6), while the torque transmission connecting sleeve 3 is used to realize the torque transmission connection between synchronous shafts.

[0055] The inner reinforcing member 4 is an aluminum alloy profile formed by aluminum extrusion, and its outer contour is precisely matched to the undulating shape of the inner wall of the irregular torsion transmission part 22. The inner reinforcing member 4 is inserted axially from the end and extends a certain length toward the interior of the circular tube synchronous shaft 2, forming a smooth stiffness transition zone to avoid a sharp change in stiffness at the end of the forming process. The inner reinforcing member 4 is riveted and fixed to the opposite sides of the irregular torsion transmission part 22 by multiple rivets. Two or three rivets can be set on each side. The rivets pass through the pre-drilled holes in the tube wall of the circular tube synchronous shaft 2 and the inner reinforcing member 4, reliably preventing axial movement and relative rotation of the inner reinforcing member 4 during long-term operation.

[0056] Two adjacent cylindrical synchronous shafts 2 are connected by a torque-transmitting connecting sleeve 3. The torque-transmitting connecting sleeve 3 is a tubular joint formed by aluminum extrusion, and its inner cavity is a non-circularly shaped mating cavity 31 that is completely consistent with the cross-sectional outline of the non-circularly shaped torque-transmitting part 22. During installation, the non-circularly shaped torque-transmitting parts 22 of the two cylindrical synchronous shafts 2 are inserted into the torque-transmitting connecting sleeve 3 from both ends. Since the non-circularly shaped torque-transmitting part 22 is directional and has a unique circumferential alignment with the mating outline of the torque-transmitting connecting sleeve 3, the synchronous shaft can only be fully inserted when the outlines of the two shafts are completely matched. After full insertion, the holes of the through bolts 33 preset on the torque-transmitting connecting sleeve 3 and the non-circularly shaped torque-transmitting part 22 automatically align. At this time, the through bolts 33 are inserted and the nuts are tightened from the outside. After assembly, the irregularly shaped torque transmission surface and the corresponding surface of the irregularly shaped mating cavity 31 fit tightly together, forming a reliable surface-fit torque transmission path. The working torque is mainly transmitted by the friction and mechanical interlocking force generated by the pressing of these mating surfaces. The through bolt 33 mainly serves the functions of axial locking and anti-loosening, preventing the torque transmission connecting sleeve 3 from slipping, and also plays an auxiliary positioning role in the circumferential direction, basically not bearing shear loads. The torque transmission connecting sleeve 3 is provided with a strip-shaped adjustment hole 32 along the axial direction to compensate for axial errors that may occur during installation.

[0057] A flexible limiting structure 5 is disposed between the main shaft 1 and the circular tube synchronous shaft 2, with multiple sets arranged at certain intervals along the axial direction of the circular tube synchronous shaft 2, forming a segmented flexible constraint on the circular tube synchronous shaft 2. The U-shaped connector 51 of each set of flexible limiting structures 5 is a metal U-shaped rod, which is clamped and fixed to the outside of the main shaft 1 by a clamp 8, with the open end covering the lower part of the main shaft 1. The wear-resistant sliding limiting component 52 is integrally formed from UHMWPE material and is block-shaped; a complete first through hole 521 is opened in the thickness direction at the lower part of the component. The through hole is circular, and the inner diameter is slightly larger than the outer diameter of the circular tube synchronous shaft 2. The circular tube synchronous shaft 2 can rotate freely inside the hole after passing through it; a second through hole 522 is opened in the width direction at the upper part of the wear-resistant sliding limiting component 52. The second through hole 522 is a transverse elongated hole. The U-shaped connector 51 passes into the second through hole 522, and a clearance fit is formed between the two that can slide relative to each other in a certain direction.

[0058] In actual operation, the main shaft 1 rotates under the drive system, and moves together with the wear-resistant sliding limiter 52 through the clamp 8 and the U-shaped connector 51; simultaneously, the circular tube synchronous shaft 2 rotates synchronously driven by the reducer 6. The first through hole 521 of the wear-resistant sliding limiter 52 allows the synchronous shaft to rotate flexibly and does not participate in torque transmission; the sliding fit between the second through hole 522 and the U-shaped connector 51 allows for a slight relative slippage between the main shaft 1 and the circular tube synchronous shaft 2 due to differences in the radius of rotation or installation offset. When the circular tube synchronous shaft 2 deflects, sways, or radially runs due to its own weight, wind load, or other factors, the hole wall of the wear-resistant sliding limiter 52 will promptly apply a flexible constraint to the circular tube synchronous shaft 2, limiting its radial displacement amplitude, so that the deflection of the circular tube synchronous shaft 2 is always controlled within the allowable range. This significantly reduces the off-center load between the irregular torque transmission part 22 and the torque transmission connecting sleeve 3 caused by excessive deformation of the shaft system, and avoids local abnormal wear and increased connection gap.

[0059] By combining the synergistic combination of irregular surface torsion transmission, circular tube structure for stable maintenance, inner lining reinforcement, and flexible limiting, this torsion transmission system significantly improves fatigue resistance, wear resistance, and displacement resistance while ensuring efficient and synchronous torque transmission. It is particularly suitable for widespread application in long-distance, multi-unit photovoltaic tracking brackets.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stable torque transmission system for a photovoltaic tracking bracket, comprising a main shaft, characterized in that: Also includes: A circular tube synchronous shaft, comprising a circular tube main body section and irregularly shaped torsion transmission parts integrally formed at both ends of the circular tube main body section; the irregularly shaped torsion transmission parts are formed by partial shaping of the ends of the circular tube synchronous shaft, and include at least one irregularly shaped torsion transmission area and at least one circular arc stabilization area that retains the original circular arc outer contour in the circumferential direction, and the irregularly shaped torsion transmission area has a non-circular irregularly shaped torsion transmission surface. Torque transmission connecting sleeve is used to connect the irregular torque transmission parts of two adjacent circular tube synchronous shafts. The torque transmission connecting sleeve is tubular and sleeved on the outer wall of the irregular torque transmission part. Its interior has an irregularly shaped mating cavity that matches the outer contour of the irregular torque transmission part. Two adjacent irregular torque transmission parts are inserted into the torque transmission connecting sleeve from both ends. The irregular torque transmission part and the torque transmission connecting sleeve achieve surface mating to transmit torque through the irregular torque transmission surface, and the connection is locked and circumferentially positioned by through bolts. The inner lining reinforcement is located inside the irregularly shaped torsion transmission part, and the outer contour of the inner lining reinforcement is adapted to the inner wall of the irregularly shaped torsion transmission part. A flexible limiting structure is connected between the main spindle and the circular tube synchronous shaft to flexibly limit the radial displacement of the circular tube synchronous shaft and allow the circular tube synchronous shaft to rotate relative to the main spindle.

2. The stable torque transmission system of the photovoltaic tracking bracket according to claim 1, characterized in that: The irregular torsion transmission part has multiple irregular torsion transmission zones, which are arranged at intervals in the circumferential direction, and the adjacent irregular torsion transmission zones are separated by a circular arc stable zone.

3. The stable torque transmission system of the photovoltaic tracking bracket according to claim 2, characterized in that: The irregularly shaped torque transmission part and the torque transmission connecting sleeve have a unique circumferential assembly position. Only when the irregularly shaped torque transmission part and the torque transmission connecting sleeve are circumferentially aligned can the holes through which the through bolts pass be aligned.

4. The stable torque transmission system of the photovoltaic tracking bracket according to claim 1, characterized in that: The torque transmission connecting sleeve is an aluminum extrusion molding structure, and the cross-sectional shape of its irregularly shaped mating cavity is consistent with the cross-sectional shape of the outer contour of the irregularly shaped torque transmission part; the torque transmission connecting sleeve is provided with a strip-shaped adjustment hole.

5. The stable torque transmission system of the photovoltaic tracking bracket according to claim 1, characterized in that: The inner lining reinforcement is an aluminum alloy part formed by aluminum extrusion. The inner lining reinforcement is inserted into the irregular torsion transmission part along the axial direction of the synchronous shaft of the round tube. The inner lining reinforcement is fixedly connected to the irregular torsion transmission part by riveting.

6. The stable torque transmission system of the photovoltaic tracking bracket according to claim 5, characterized in that: The flexible limiting structure includes: The U-shaped connector is fixedly connected to the clamp on the outside of the spindle; The wear-resistant sliding limiter has a first through hole in the lower part along the thickness direction for the synchronous shaft of the round tube to pass through, so that the synchronous shaft of the round tube can rotate freely in the first through hole; the upper part of the wear-resistant sliding limiter has a second through hole in the width direction for the U-shaped connector to pass through to form a sliding fit.

7. The stable torsion transmission system of the photovoltaic tracking bracket according to claim 6, characterized in that: The U-shaped connector is fixedly installed on the outside of the main shaft by a clamp.

8. The stable torque transmission system of the photovoltaic tracking bracket according to claim 6, characterized in that: The wear-resistant sliding limit component is integrally formed from UHMWPE material, and the first through hole is a complete circular hole.

9. The stable torque transmission system of the photovoltaic tracking bracket according to claim 6, characterized in that: The flexible limiting structure is provided in multiple intervals along the axial direction of the synchronous shaft of the circular tube.

10. The stable torque transmission system of the photovoltaic tracking bracket according to claim 5, characterized in that: The riveting components consist of multiple rivets located on opposite sides of the irregularly shaped torsion transmission section.

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